| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 123000000 | Rear compression | 66 |
| 123073000 | Crankcase | 63 |
| 20080302345 | A Crankcase Scavenged Two-Stroke Internal Combustion Engine Having an Additional Air Supply - A crankcase scavenged two-stroke internal combustion engine ( | 12-11-2008 |
| 20090056687 | Two-stroke, homogeneous charge, spark-ignition engine - A method for combusting fuel in an engine involving decreasing a first volume of air to a third volume, in two stages, the first stage in a crankcase compressor decreasing a first volume of air to a second volume and a second stage in the engine cylinder decreasing a second volume of a gas to a third volume, injection of fuel between the two stages into partially compressed hot air to provide homogenous charge to the cylinder to begin second stage compression in the cylinder having two variable compression ratios, a first variable compression ratio for low loads to reach a compression temperature slightly below the autoignition temperature of the homogeneous charge such that spark ignited HCCI-like combustion being emission free, a second much smaller variable compression ratio for preventing pre-ignition at high loads, then increasing the pressure at constant volume via combusting homogeneous charge in the cylinder, increasing the third volume of gas to a fourth volume (an expansion process having a chosen expansion ratio much greater than the compression ratio), decreasing the pressure to atmospheric pressure while removing heat under constant volume, and finally decreasing the volume of gas to the first volume while removing heat under constant pressure to complete a two-stroke homogeneous charge spark-ignition cycle. Also disclosed is an engine employing the two-stroke HCSI cycle. | 03-05-2009 |
| 20090308369 | Laminated Counterweight for Timing Control - A stratified two-stroke engine having a laminated counterweight is disclosed. The laminated counterweight includes a traditional counterweight portion and a laminate portion. The laminate portion has an approximately circular peripheral shape and at least one notch. In operation, the notch may be used to time the opening and closing of a mixture port or a transfer port. | 12-17-2009 |
| 20100012106 | STRATIFIED SCAVENGING TWO-CYCLE ENGINE - Provided is a laminar-scavenging two-cycle engine, which can have a higher laminar-scavenging effect than that of the laminar-scavenging two-cycle engine of the prior art and which can expect drastically excellent effects on the stabilization of combustion and on the blow-by prevention. The laminar-scavenging two-cycle engine is characterized in that a scavenging passage ( | 01-21-2010 |
| 20100059030 | Stratified Scavenging Two-Cycle Engine - A stratified scavenging two-cycle engine that has a simpler structure than conventional stratified scavenging two-cycle engines and that has an excellent blow-by prevention effect etc. In an air intake stroke, lead air passes a lead-air port ( | 03-11-2010 |
| 20100139637 | TWO-STROKE ENGINE - An object is to provide a two-stroke engine achieving effective reduction of blow-by while implementing efficient gas exchange. In a two-stroke engine | 06-10-2010 |
| 20100170485 | TWO STROKE COMBUSTION ENGINE - The invention related to a two-stroke internal combustion engine ( | 07-08-2010 |
| 20100252011 | IDLE SPEED CONTROL FOR A HANDHELD POWER TOOL - Method for controlling fuel metering in a carburetor or a low pressure injection system of an internal combustion engine when the engine is operating at idle speed, the method includes the steps of:
| 10-07-2010 |
| 20100307469 | Method for operating a two-stroke engine - A two-stroke engine ( | 12-09-2010 |
| 20120145137 | TWO-CYCLE ENGINE - An engine includes a cylinder block, and a piston slidably mounted in a cylinder, with the cylinder block being formed with an exhaust passage leading to a combustion chamber through an exhaust port, a first scavenging port opened to an inner circumferential surface of the cylinder, a first communication passage formed from the first scavenging port in a radial direction of the cylinder, and a first scavenging passage formed with an opening on a bottom surface of the first communication passage, in which a side surface on a far side from the exhaust port forming the communication passage is formed towards the far side from the exhaust port in the combustion chamber, and the opening portion of the first scavenging passage and a landing portion formed in the periphery of the opening portion are formed at a bottom portion of the communication passage. | 06-14-2012 |
| 20120152217 | TWO-STROKE ENGINE - A two-stroke engine has a cylinder with a combustion chamber which is bounded by a piston which drives a crankshaft which rotates in a crankcase. The crankcase is connected to the combustion chamber via an overflow passage in the lower dead centre region of the piston. The two stroke engine has an intake passage. A carburetor forms a section of the intake passage. The intake passage is partially divided into an air passage, which supplies combustion air into an overflow passage, and a mixture passage which opens into the crankcase. A throttle valve mounted pivotably in the carburetor controls the combustion air quantity supplied to the air and mixture passages. An air-guiding element arranged on the passage wall of the air passage guides the combustion air passing between the throttle valve and passage wall in the idling position of the throttle valve in the direction of the mixture passage. | 06-21-2012 |
| 20120152218 | TWO-STROKE ENGINE - A two-stroke engine, comprising: a crankcase; a cylinder connected to said crankcase; a combustion chamber defined by a reciprocally mounted piston within said cylinder; a crankshaft mounted rotatably in said crankcase and drivingly connected with said piston; at least one overflow passage connecting the crankcase and the combustion chamber when the piston is positioned in the lower dead center region; a connecting stub attached to said cylinder which contains an intake passage that opens into the crankcase and supplies fuel and combustion air, said intake passage including therein an air-fuel mixture passage, wherein said connecting stub contains at least one section of the mixture passage; at least one fuel opening for supplying fuel into said mixture passage; and a guiding rib positioned within said connecting stub and oriented longitudinally in the mixture passage and protruding into the mixture passage. | 06-21-2012 |
| 20120304973 | Two-Stroke Engine - An engine has a cylinder wherein a reciprocating piston is mounted. The piston drives, via a connecting rod ( | 12-06-2012 |
| 20140238371 | Two-Stroke Internal Combustion Engine - The scavenging passage includes a wall surface that defines an orientation direction of a main scavenging gas flow spouting from the scavenging port to the cylinder chamber. In a boundary portion between the scavenging port and the scavenging passage, a wall surface located on an opposite side of the exhaust port is composed of an inclined surface inclined in a direction further away from the exhaust port than a wall surface of a deep portion of the scavenging passage. The scavenging port includes a rear wall surface located in a portion on the opposite side of the exhaust port. The rear wall surface continues to the inclined surface to extend in the direction away from the exhaust port and generates an incidental scavenging gas flow incidental to the main scavenging gas flow and higher in speed than the main scavenging gas flow. | 08-28-2014 |
| 20140318518 | OPPOSED PISTON INTERNAL COMBUSTION ENGINE WITH INVISCID LAYER SEALING - An opposed-piston engine that forms an inviscid layer between pistons and the respective cylinder walls. In an aspect, the opposed-piston engine utilizes a Scotch yoke assembly that includes rigidly connected opposed combustion pistons. In an aspect, the Scotch yoke assembly is configured to transfer power from the combustion pistons to a crankshaft assembly. In an aspect, the crankshaft assembly can be configured to have dual flywheels that are internal to the engine, and can be configured to assist with an exhaust system, a detonation system, and/or a lubrication system. | 10-30-2014 |
| 20160061097 | UNIFLOW SCAVENGING 2-CYCLE ENGINE - A uniflow scavenging 2-cycle engine includes a cylinder inside which a combustion chamber is formed; a piston which slides within the cylinder; a scavenge port which is provided on one end side in a stroke direction of the piston in the cylinder to suck an active gas into the combustion chamber in accordance with the sliding movement of the piston; and a fuel injection unit which has an injection port located on the outside of the cylinder, and injects the fuel gas into the active gas sucked into the scavenge port. | 03-03-2016 |
| 20080302344 | Internal combustion engine and method of operating the same - An internal combustion engine has a cylinder ( | 12-11-2008 |
| 20100288252 | Non-Polluting Two-Stroke Engine with Air-Cooled Piston - A two-stroke internal combustion engine has at least one cylinder having a bore diameter, a central axis, a cylinder wall, and an upper and a lower extremity, a piston slip-fit in the cylinder, the piston having an overall height and a top surface, an upper portion and a lower portion each of approximately the bore diameter, each of the upper and lower portions having at least one seal ring between the piston and the cylinder wall, and a central portion of significantly less than the bore diameter and a height at least one-half of the overall piston height, providing an annular space between the central piston portion and the cylinder wall, a crank mechanism coupled to the piston in a manner providing a repeating stroke of a specific stroke length in the direction of the central axis of the cylinder, the repeating stroke providing a varying volume V between the top of the cylinder and the top surface of the piston, one or more exhaust ports through the cylinder wall, each exhaust port having a first height in the direction of the cylinder axis, centered at a first dimension from the top of the cylinder, one or more intake ports through the cylinder wall, each intake port having a second height in the direction of the cylinder axis, centered at a second dimension from the top of the cylinder, and a forced-air mechanism providing air to the one or more intake ports, wherein for a significant portion of every stroke both the one or more exhaust ports and the one or more intake ports are open to the annular space between the central piston portion and the cylinder wall, allowing the air pump to force air from the one or more intake ports around the central piston portion to the one or more exhaust ports. | 11-18-2010 |
| 20100288253 | AIR INTAKE PORTING FOR A TWO STROKE ENGINE - A two stroke engine of a particular configuration can have its power output increased by running bigger pistons and using ports in the piston skirt through which to conduct compressed air within the skirt through short passages in the cylinder housing that conduct the air from within the skirt to above the piston. As a result a larger piston can be used for the same spacing and opening size in the block to save the need to redesign the block and the crankshaft. A position adjuster for the piston moves it axially without rotation of the piston ports out of alignment with inlet ports in the housing. The piston rod is held in the crosshead using a flat to prevent rotation while an adjuster nut that is turned creates axial movement in the piston rod with a lock nut securing the final piston position. | 11-18-2010 |
| 20110017182 | TWO-STROKE INTERNAL COMBUSTION ENGINE - There is provided a loop-scavenged two-stroke internal combustion engine that is capable of effectively suppressing the short-circuiting of fresh charge (unburnt air-fuel mixture), while at the same time being capable of further improving scavenging efficiency, combustion efficiency, etc., as well as of improving the durability and output stability of a cylinder and a piston. One pair or a plurality of pairs of scavenging passages ( | 01-27-2011 |
| 20110017183 | TWO-STROKE INTERNAL COMBUSTION ENGINE - There is provided a reverse scavenged two-stroke internal combustion engine that is capable of effectively suppressing the short-circuiting of fresh charge (unburnt air-fuel mixture), while at the same time being capable of further improving scavenging efficiency, combustion efficiency, etc. The horizontal sectional shape of at least one pair of scavenging passages ( | 01-27-2011 |
| 20110079206 | TWO-STROKE ENGINE - In a two-stroke engine ( | 04-07-2011 |
| 20110146642 | Two-Stroke Engine, Sand Core for Producing a Two-Stroke Engine, and Method for Operating a Two-Stroke Engine - A two-stroke engine has a cylinder with a combustion chamber and a reciprocating piston for driving a crankshaft. Transfer passages connect the crankcase in at least one position of the piston with the combustion chamber and open by piston-controlled transfer ports into the combustion chamber. An inlet opens into the crankcase and an outlet is provided at the combustion chamber. The engine is dividable into four sectors parallel to a longitudinal cylinder axis. The transfer port of a first transfer passage is arranged in the first sector, the outlet is arranged in the second sector, the transfer port of a second transfer passage is provided in the third sector, and the inlet is arranged in the fourth sector. Within the cylinder the first and second transfer passages, at a spacing from a separation plane between cylinder and crankcase, pass together into one of the second and fourth sectors. | 06-23-2011 |
| 20110146643 | Two-Stroke Engine - A two-stroke engine has a cylinder with a combustion chamber and a piston reciprocatingly supported in the cylinder. A crankshaft is rotatably supported in a crankcase and driven by the piston. At least one transfer passage connects the crankcase in at least one position of the piston with the combustion chamber and has a piston-controlled transfer port that opens into the combustion chamber and an opening that opens into the crankcase. A mixture inlet opens into the crankcase. An outlet is provided at the combustion chamber. The transfer port and the opening are displaced relative to each other in a circumferential direction of the cylinder. At least one wall section of the transfer passage forms an undercut when viewed from the crankcase in a direction of a longitudinal cylinder axis of the cylinder and is delimited by a separate component inserted into the cylinder from a side facing the crankcase. | 06-23-2011 |
| 20110197868 | Two-stroke engine - A two-stroke engine ( | 08-18-2011 |
| 20110247601 | TWO-CYCLE ENGINE AND LOW EMISSION CONTROL SYSTEM - A two-cycle engine including exhaust, air inlet, scavenging and air/fuel intake windows disposed in the cylinder wall, a reciprocating piston driving a crankshaft, and curved gas-conveying channels connecting the crankcase chamber with the cylinder bore, the channels being opened by the reciprocating piston and the channels producing centrifugation of gases circulating therein to produce lean and rich components of an air/fuel mixture, wherein the lean component is circulated in a region of the combustion chamber remote from the exhaust window for promoting reduced combustion residues. | 10-13-2011 |
| 20110308507 | TWO-STROKE CYCLE COMBUSTION ENGINE OF AIR SCAVENGING TYPE - A two-stroke cycle combustion engine of an air scavenging type includes one or more scavenging passages ( | 12-22-2011 |
| 20120006308 | Piston for a Two-Stroke Engine - A transfer passage design for a two stroke internal combustion engine that allows for regulation of the air/fuel flow as the piston nears the bottom of its stroke. Additionally, a cut out in the skirt of the piston may allow for additional gaseous communication between the crankcase chamber and the transfer passage. | 01-12-2012 |
| 20120024276 | LOOP SCAVENGED TWO-STROKE INTERNAL COMBUSTION ENGINE - A loop scavenged two-stroke internal combustion engine which can effectively restrain blow-by of fresh gas with a relatively simple configuration is provided. A horizontal scavenging angle θb in at least one spot of a scavenging passage | 02-02-2012 |
| 20120060806 | Two-Stroke Engine - A two-stroke engine has a cylinder having a cylinder bore with a combustion chamber and an outlet connected with the combustion chamber. A piston is disposed in the cylinder and delimits the combustion chamber. The piston has a piston recess. A crankcase is provided that has a crankshaft rotatably supported therein. The piston drives in rotation the crankshaft. In at least one position of the piston, the crankcase is connected by a transfer passage with the combustion chamber. An air passage is provided as well as a mixture passage that has a mixture inlet that is disposed at the cylinder bore and opens into the cylinder bore and is piston-controlled. The transfer passage is connected by the piston recess to the air passage when the piston is at top dead center. The piston recess has a connection to the mixture inlet in at least one position of the piston. | 03-15-2012 |
| 20120247442 | STRATIFIED TWO-STROKE ENGINE - Various embodiments include two-stroke stratified engines and dual passage carburetors for use with gaseous fuel and liquid fuels. A stratified air-head engine having a simpler intake manifold with a single air pipe for induction of air is included. | 10-04-2012 |
| 20120260900 | STRATIFIED SCAVENGING TWO-CYCLE ENGINE - A laminar-scavenging two-cycle engine which has a high laminar-scavenging effect, includes a scavenging passage having a crankcase side portion extending along a crankcase, and a cylinder side portion extending along a cylinder and having a length larger than the sum of the diameter and stroke of the cylinder. An ambient air introducing passage for introducing leading air into the scavenging passage is connected to an intermediate portion of the scavenging passage. A notch for opening a scavenging port to the side of the crankcase when a piston is near the top dead center is formed in the piston. | 10-18-2012 |
| 20120325191 | SCAVENGING PASSAGE STRUCTURE FOR TWO-STROKE ENGINE - A scavenging passage structure for a two-stroke engine, having a scavenging passage communicating a scavenging port provided in a cylinder with a crank chamber formed inside a crankcase, the scavenging passage being formed to extend through respective fastening surfaces of the cylinder and the crankcase. The scavenging passage includes a cover member attached inside the crankcase to be in contact with an inner wall surface of the crankcase, and a groove formed in at least one of the inner wall surface of the crankcase contacting the cover member, and the cover member contacting the inner wall surface of the crankcase, the groove forming part of the scavenging passage connecting to the crank chamber and to an upper face of the crankcase. | 12-27-2012 |
| 20130037011 | Two-Stroke Internal Combustion Engine - It is intended to effectively prevent blow-by with no need for large changes in typical structures of two-cycle internal combustion engines. A main scavenging passage ( | 02-14-2013 |
| 20130061835 | Two-Stroke Engine and a Method for the Operation thereof - A two-stroke engine has a cylinder wherein a piston is journalled for reciprocating movement. The piston delimits a combustion chamber configured in the cylinder. The engine has an outlet from the combustion chamber and a transfer channel which opens at an inlet opening into the crankcase and at a transfer window in the combustion chamber. The piston drives a crankshaft via a connecting rod. The crankshaft is rotatably journalled in the crankcase. At least one control element for the inlet opening is connected to the crankshaft so as to rotate therewith. | 03-14-2013 |
| 20130068205 | TWO-STROKE ENGINE AND LUBRICATION - Various embodiments include a two-stroke engine and a carburetor for use with gaseous fuel, such as hydrogen, methane, liquid petroleum gas, pure propane, and butane. | 03-21-2013 |
| 20140060507 | ENGINE AND ENGINE-DRIVEN WORKING MACHINE - An engine and an engine-driven working machine which enable blow-though prevention of an uncombusted air-fuel mixture and control of the number of times of combustion, stabilize operation during idling, and ensure output and acceleration performance during working are provided. A two-cycle engine having: a piston; a crankcase in which scavenging passages are formed; and a cylinder in which scavenging ports communicated with the scavenging passages and an exhaust port for discharging a combustion gas are formed. In the two-cycle engine, at least two or more systems of the scavenging passages having mutually different opening/closing systems are formed in the crankcase. | 03-06-2014 |
| 20140182571 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A stratified scavenging two-stroke engine includes a first scavenging passage that extends from a first scavenging intake that opens to the inside of the crankcase to a first scavenging port that opens to the inside of a cylinder, and a second scavenging passage that extends from a second scavenging intake that opens to the inside of the crankcase to a second scavenging port that opens to the inside of the cylinder. The first and second passages are formed so as to communicate with each other via a communicating portion. An air passage is connected to the first passage at a position closer to the first scavenging intake than the communicating portion. A first check valve inhibits a flow from the first passage to the inside of the crankcase, and a second check valve inhibits a flow from the first passage through the air passage to the outside. | 07-03-2014 |
| 20140318517 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A stratified scavenging two-stroke engine includes: an intake passage that connects an intake opening through an outer surface of a cylinder member with an intake port opening to the inside of a cylinder, and supplies gaseous mixture of fuel and air; an exhaust passage that connects an exhaust outlet opening through the outer surface of the cylinder member with an exhaust port opening to the inside of the cylinder, and discharges combustion gas; a scavenging passage; and an air passage that connects an air inlet opening through the outer surface of the cylinder member with the scavenging passage and supplies pre-scavenging air into the scavenging passage. The intake and the air inlet are arranged at positions opposite from the exhaust port across the axis of the cylinder, and arranged side by side in a substantially circumferential direction of the cylinder or a direction substantially perpendicular to the axis of the cylinder. | 10-30-2014 |
| 20160069296 | TWO-STROKE ENGINE - A two-stroke engine has a cylinder with a combustion chamber formed therein. The combustion chamber is delimited by a piston. The cylinder has a base on which extends a partition plane whereat the cylinder is separated from a crankcase. The combustion chamber is, in at least one piston position, connected via at least one transfer channel to the crankcase interior. The transfer channel passes from the cylinder into the crankcase at at least one opening. A side wall of the transfer channel has, in the cylinder, a first region wherein the wall encloses an angle of 90° with the cylinder longitudinal axis. Between the first region and the opening as viewed in the cylinder circumferential direction is arranged a second wall region. The second region has a spacing, measured parallel to the cylinder longitudinal axis, to the partition plane. The spacing is greater than the spacing in the first region. | 03-10-2016 |
| 20160097344 | Air Leading-Type Stratified Scavenging Two-Stroke Internal-Combustion Engine - The efficiency of charging air to a scavenging channel is enhanced by generating a gas flow in a piston groove simultaneously with the piston groove coming into communication with an air port. A piston groove | 04-07-2016 |
| 20090095269 | Two-Cycle Engine - In a stratified scavenging two-cycle engine | 04-16-2009 |
| 20100037877 | TWO CYCLE ENGINE AND TWO CYCLE ENGINE TOOL - The invention provides a two cycle engine which effectively suppresses an intrusion of a combustion gas into a crank chamber. Further, the invention provides a two cycle engine tool provided with the two cycle engine mentioned above. An engine is provided with a cylinder having two scavenge air ports at different positions in a cylinder circumference direction, and scavenge air inflow ports communicating individually with these two scavenge air ports via a scavenge air passage, and a piston in which two scavenge air communication ports are formed at positions corresponding to the scavenge air inflow ports, and is structured to swirl the gas flowing into the piston from the cylinder through the scavenge air passage, in an upper portion of the internal space of the piston, and retains the gas in the upper portion of the internal space of the piston. | 02-18-2010 |
| 20110180054 | Two-Stroke Internal Combustion Engine and Its Scavenging Method - In a two-stroke internal combustion engine using air for scavenging its combustion chamber ( | 07-28-2011 |
| 20120024275 | TWO-STROKE INTERNAL COMBUSTION ENGINE - A two stroke crank case scavenged two-stroke internal combustion engine, the engine including: a cylinder ( | 02-02-2012 |
| 20130255652 | INTERNAL COMBUSTION ENGINE, IN PARTICULAR TWO-STROKE INTERNAL COMBUSTION ENGINE - To create an internal combustion engine including a crankcase and a cylinder, wherein a piston is guided in the cylinder to perform a stroke movement and movably defines a combustion chamber, and wherein at least one transfer channel, through which ignition mixture is guided from the crankcase into the combustion chamber, is arranged in the cylinder, which leads to a further improvement of the exhaust gas quality and/or of the fuel consumption, in particular for creating an improved metering of ignition mixture into the fuel chamber, it is proposed for the piston to encompass a lower piston edge, which interacts with at least one counter body such that an inlet cross section of the transfer channel for the inflow of the ignition mixture from the crankcase into the transfer channel can be controlled by the stroke movement of the piston by the lower piston edge. | 10-03-2013 |
| 20150337765 | Stratified Scavenging Two-Stroke Internal Combustion Engine And Carburetor Thereof - A carburetor achieves better emission characteristics while improving a combustion state by increasing a delivery ratio of a stratified scavenging engine and reducing intake resistance. No dividing wall is provided between a throttle valve | 11-26-2015 |
| 20150377117 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A stratified scavenging two-stroke engine includes a first scavenging passage that extends from a first scavenging intake that opens to the inside of the crankcase to a scavenging port that opens to the inside of a cylinder, and a second scavenging passage that branches from the first scavenging passage and extends to a second scavenging intake that opens to the inside of the crankcase. An air passage is provided to supply air for pre-scavenging into the first scavenging passage at a position closer to the first scavenging intake than a position at which the second scavenging passage branches from the first scavenging passage. A first check valve inhibits a flow of air from the first scavenging passage during an upward stroke of the piston, and a second check valve inhibits a flow of air and a gaseous mixture from the first scavenging passage during a downward stroke of the piston. | 12-31-2015 |
| 20160169087 | Air Leading Type Two-Stroke Engine And Intake System For Same, And Carburetor | 06-16-2016 |
| 20160376979 | Stratified Scavenging Two-Stroke Internal Combustion Engine, Air Cleaner Of The Same, And Intake Method - An amplitude of a pressure fluctuation in a vicinity of a main nozzle of a carburetor ( | 12-29-2016 |
| 20080308084 | CYLINDER/CRANKCASE GROUP FOR TWO-STROKE INTERNAL COMBUSTION ENGINES PROVIDED WITH MEANS FOR SUPERCHARGING THE ENGINE - A fuel injection system for a two-stroke internal combustion engine ( | 12-18-2008 |
| 20160252011 | TWO-CYCLE GAS ENGINE | 09-01-2016 |
| 20090283081 | AIR INTAKE PORTING FOR A TWO STROKE ENGINE - A two stroke engine of a particular configuration can have its power output increased by running bigger pistons and using ports in the piston skirt through which to conduct compressed air within the skirt through short passages in the cylinder housing that conduct the air from within the skirt to above the piston. As a result a larger piston can be used for the same spacing and opening size in the block to save the need to redesign the block and the crankshaft. A position adjuster for the piston moves it axially without rotation of the piston ports out of alignment with inlet ports in the housing. The piston rod is held in the crosshead using a flat to prevent rotation while an adjuster nut that is turned creates axial movement in the piston rod with a lock nut securing the final piston position. | 11-19-2009 |
| 20120097141 | TWO-STROKE ENGINE WITH A COMPRESSED-AIR-ASSISTED FUEL-INJECTION SYSTEM - A two-stroke internal combustion engine is provided and includes a casing, a cylinder, a piston skirt, an aspirating port, a carburetor which supplies the casing with an air/fuel mixture, through said aspirating port, a transfer conduit which opens into the cylinder through an air/fuel inlet port, and a fuel storage system, or resonance tube which communicates with a first port located above the aspirating port, and with a second port located below the aspirating port. The first port and the second port are alternatingly opened by the piston skirt, which includes a through-hole having a diameter between 0.5 and 3.0 mm. The through-hole being located, when the piston is mounted in the engine, in a same radial plane as the second port. | 04-26-2012 |
| 20120318250 | TWO-STROKE ENGINE - The two-stroke engine has a plurality of intake passages extending from the external air inlet port through the crankcase, separating the intake air charge from the air and oil vapor within the crankcase. The piston has one or more corresponding inlet tubes depending therefrom that telescope within the crankcase intake passages as the piston reciprocates. All intake air travels through these passages and is separated from the remainder of the crankcase volume. The incoming air charge passes through a concentric poppet valve in the piston crown to enter the combustion chamber. Fuel is provided by conventional direct or port injection and ignition is provided by one or more conventional spark plugs. Diesel operation is achievable when the engine is configured appropriately. Exhaust exits the combustion chamber through a poppet valve in the cylinder head, the poppet valve being actuated by a rocker arm and pushrod from a crankshaft driven cam. | 12-20-2012 |
| 20140331981 | AIR INTAKE PORTING FOR A TWO STROKE ENGINE - A two stroke engine of a particular configuration can have its power output increased by running bigger pistons and using ports in the piston skirt through which to conduct compressed air within the skirt through short passages in the cylinder housing that conduct the air from within the skirt to above the piston. As a result a larger piston can be used for the same spacing and opening size in the block to save the need to redesign the block and the crankshaft. A position adjuster for the piston moves it axially without rotation of the piston ports out of alignment with inlet ports in the housing. The piston rod is held in the crosshead using a flat to prevent rotation while an adjuster nut that is turned creates axial movement in the piston rod with a lock nut securing the final piston position. | 11-13-2014 |
| 20150345372 | ASYMMETRIC TRANSFER AND INTAKE IN TWO-STROKES - With shaped connecting rod, piston and cylinder, an advantageous asymmetric timing of the two-stroke engine is achieved, wherein the combustion chamber communicates with the crankcase through a transfer port controlled by the piston and through a respective piston port controlled by the connecting rod, with the transfer port and its respective piston port arranged “in series”, and wherein an intake port communicates with the crankcase through a piston port controlled by the connecting rod, with the intake port and its respective piston port arranged “in series”. | 12-03-2015 |
| 20090007894 | Two-Cycle Engine - A stratified scavenging two-cycle engine includes: an air passage for delivering pure air to a scavenging passage; an air valve for opening and closing the air passage; and an auxiliary air passage for delivering the pare air to the scavenging passage when the air valve is completely closed. An amount of air for air-fuel mixture sucked in a crank chamber is reduced to increase the concentration of the air-fuel mixture, and air that supplements the reduced amount of the air for air-fuel mixture is fed into the scavenging passage through the auxiliary air passage, which enables the engine to be smoothly accelerated even when being suddenly accelerated from an idling state with an appropriate concentration of the air-fuel mixture sucked in a cylinder chamber during idling. | 01-08-2009 |
| 20110162630 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A two-stroke engine is provided with a piston, a cylinder that houses the piston in a manner allowing reciprocation, a crankshaft that is connected to the piston via a connecting rod, a crankcase that houses the crankshaft in a manner allowing rotation, a mixture gas passage that introduces mixture gas into the crankcase, a scavenging passage that extends between a scavenging intake that opens into the crankcase and a scavenging port that opens into the cylinder; and an air passage that is connected to an intermediate position of the scavenging passage for introducing air into the scavenging passage. The engine is adapted such that, in a part of an upward stroke period of the piston, the crankcase in which negative pressure is generated is connected to the scavenging passage via the scavenging port. Accordingly, most of air introduced into the scavenging passage form the air passage flows toward the scavenging port and into the cylinder without changing the direction of flow. | 07-07-2011 |
| 20120097142 | PRE-COMBUSTION CYCLE PRESSURISATION SYSTEM - A two stroke internal combustion engine ( | 04-26-2012 |
| 20130092137 | FIXING DEVICE FOR TWO-STROKE ENGINE - A two-stroke engine includes a cylinder, a combustion chamber formed in a cylinder running surface, and a cylinder head and with an outlet port of the combustion chamber. A transfer port is formed in the cylinder in order to connect the interior space of a crankcase of the two-stroke engine with the combustion chamber. The cylinder includes an axial bore, at least partially penetrating a wall of the outlet port and/or of the transfer port, so that the bore at least partially forms an opening at the wall side in the outlet port and/or in the transfer port. A pin is in the bore. The pin closes the opening at the wall side in such a way that the original surface of the wall of the outlet port and/or of the transfer port is substantially restored in the area of the opening at the wall side. | 04-18-2013 |
| 20130037010 | UNIFLOW PORT-LESS TWO-STROKE ENGINE - Uniflow two-stroke engines without ports on the cylinder and with four-stroke lubrication | 02-14-2013 |
| 20140251293 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A two-stroke engine is provided with a scavenging passage that extends between a scavenging intake that opens into a crankcase and a scavenging port that opens into a cylinder, and an air passage that is connected to an intermediate position of a scavenging passage for introducing air into the scavenging passage. A first check valve that is disposed within a section of a scavenging passage between a scavenging intake and the intermediate position. A second check valve that is disposed within the air passage. The section of the scavenging passage between the intermediate position and the scavenging intake, the air passage, and a mixture gas passage are arranged in a substantially same direction with respect to a longitudinal axis of the cylinder. | 09-11-2014 |
| 123073000 | Fuel to crankcase | 9 |
| 20080302345 | A Crankcase Scavenged Two-Stroke Internal Combustion Engine Having an Additional Air Supply - A crankcase scavenged two-stroke internal combustion engine ( | 12-11-2008 |
| 20090056687 | Two-stroke, homogeneous charge, spark-ignition engine - A method for combusting fuel in an engine involving decreasing a first volume of air to a third volume, in two stages, the first stage in a crankcase compressor decreasing a first volume of air to a second volume and a second stage in the engine cylinder decreasing a second volume of a gas to a third volume, injection of fuel between the two stages into partially compressed hot air to provide homogenous charge to the cylinder to begin second stage compression in the cylinder having two variable compression ratios, a first variable compression ratio for low loads to reach a compression temperature slightly below the autoignition temperature of the homogeneous charge such that spark ignited HCCI-like combustion being emission free, a second much smaller variable compression ratio for preventing pre-ignition at high loads, then increasing the pressure at constant volume via combusting homogeneous charge in the cylinder, increasing the third volume of gas to a fourth volume (an expansion process having a chosen expansion ratio much greater than the compression ratio), decreasing the pressure to atmospheric pressure while removing heat under constant volume, and finally decreasing the volume of gas to the first volume while removing heat under constant pressure to complete a two-stroke homogeneous charge spark-ignition cycle. Also disclosed is an engine employing the two-stroke HCSI cycle. | 03-05-2009 |
| 20090308369 | Laminated Counterweight for Timing Control - A stratified two-stroke engine having a laminated counterweight is disclosed. The laminated counterweight includes a traditional counterweight portion and a laminate portion. The laminate portion has an approximately circular peripheral shape and at least one notch. In operation, the notch may be used to time the opening and closing of a mixture port or a transfer port. | 12-17-2009 |
| 20100012106 | STRATIFIED SCAVENGING TWO-CYCLE ENGINE - Provided is a laminar-scavenging two-cycle engine, which can have a higher laminar-scavenging effect than that of the laminar-scavenging two-cycle engine of the prior art and which can expect drastically excellent effects on the stabilization of combustion and on the blow-by prevention. The laminar-scavenging two-cycle engine is characterized in that a scavenging passage ( | 01-21-2010 |
| 20100059030 | Stratified Scavenging Two-Cycle Engine - A stratified scavenging two-cycle engine that has a simpler structure than conventional stratified scavenging two-cycle engines and that has an excellent blow-by prevention effect etc. In an air intake stroke, lead air passes a lead-air port ( | 03-11-2010 |
| 20100139637 | TWO-STROKE ENGINE - An object is to provide a two-stroke engine achieving effective reduction of blow-by while implementing efficient gas exchange. In a two-stroke engine | 06-10-2010 |
| 20100170485 | TWO STROKE COMBUSTION ENGINE - The invention related to a two-stroke internal combustion engine ( | 07-08-2010 |
| 20100252011 | IDLE SPEED CONTROL FOR A HANDHELD POWER TOOL - Method for controlling fuel metering in a carburetor or a low pressure injection system of an internal combustion engine when the engine is operating at idle speed, the method includes the steps of:
| 10-07-2010 |
| 20100307469 | Method for operating a two-stroke engine - A two-stroke engine ( | 12-09-2010 |
| 20120145137 | TWO-CYCLE ENGINE - An engine includes a cylinder block, and a piston slidably mounted in a cylinder, with the cylinder block being formed with an exhaust passage leading to a combustion chamber through an exhaust port, a first scavenging port opened to an inner circumferential surface of the cylinder, a first communication passage formed from the first scavenging port in a radial direction of the cylinder, and a first scavenging passage formed with an opening on a bottom surface of the first communication passage, in which a side surface on a far side from the exhaust port forming the communication passage is formed towards the far side from the exhaust port in the combustion chamber, and the opening portion of the first scavenging passage and a landing portion formed in the periphery of the opening portion are formed at a bottom portion of the communication passage. | 06-14-2012 |
| 20120152217 | TWO-STROKE ENGINE - A two-stroke engine has a cylinder with a combustion chamber which is bounded by a piston which drives a crankshaft which rotates in a crankcase. The crankcase is connected to the combustion chamber via an overflow passage in the lower dead centre region of the piston. The two stroke engine has an intake passage. A carburetor forms a section of the intake passage. The intake passage is partially divided into an air passage, which supplies combustion air into an overflow passage, and a mixture passage which opens into the crankcase. A throttle valve mounted pivotably in the carburetor controls the combustion air quantity supplied to the air and mixture passages. An air-guiding element arranged on the passage wall of the air passage guides the combustion air passing between the throttle valve and passage wall in the idling position of the throttle valve in the direction of the mixture passage. | 06-21-2012 |
| 20120152218 | TWO-STROKE ENGINE - A two-stroke engine, comprising: a crankcase; a cylinder connected to said crankcase; a combustion chamber defined by a reciprocally mounted piston within said cylinder; a crankshaft mounted rotatably in said crankcase and drivingly connected with said piston; at least one overflow passage connecting the crankcase and the combustion chamber when the piston is positioned in the lower dead center region; a connecting stub attached to said cylinder which contains an intake passage that opens into the crankcase and supplies fuel and combustion air, said intake passage including therein an air-fuel mixture passage, wherein said connecting stub contains at least one section of the mixture passage; at least one fuel opening for supplying fuel into said mixture passage; and a guiding rib positioned within said connecting stub and oriented longitudinally in the mixture passage and protruding into the mixture passage. | 06-21-2012 |
| 20120304973 | Two-Stroke Engine - An engine has a cylinder wherein a reciprocating piston is mounted. The piston drives, via a connecting rod ( | 12-06-2012 |
| 20140238371 | Two-Stroke Internal Combustion Engine - The scavenging passage includes a wall surface that defines an orientation direction of a main scavenging gas flow spouting from the scavenging port to the cylinder chamber. In a boundary portion between the scavenging port and the scavenging passage, a wall surface located on an opposite side of the exhaust port is composed of an inclined surface inclined in a direction further away from the exhaust port than a wall surface of a deep portion of the scavenging passage. The scavenging port includes a rear wall surface located in a portion on the opposite side of the exhaust port. The rear wall surface continues to the inclined surface to extend in the direction away from the exhaust port and generates an incidental scavenging gas flow incidental to the main scavenging gas flow and higher in speed than the main scavenging gas flow. | 08-28-2014 |
| 20140318518 | OPPOSED PISTON INTERNAL COMBUSTION ENGINE WITH INVISCID LAYER SEALING - An opposed-piston engine that forms an inviscid layer between pistons and the respective cylinder walls. In an aspect, the opposed-piston engine utilizes a Scotch yoke assembly that includes rigidly connected opposed combustion pistons. In an aspect, the Scotch yoke assembly is configured to transfer power from the combustion pistons to a crankshaft assembly. In an aspect, the crankshaft assembly can be configured to have dual flywheels that are internal to the engine, and can be configured to assist with an exhaust system, a detonation system, and/or a lubrication system. | 10-30-2014 |
| 20160061097 | UNIFLOW SCAVENGING 2-CYCLE ENGINE - A uniflow scavenging 2-cycle engine includes a cylinder inside which a combustion chamber is formed; a piston which slides within the cylinder; a scavenge port which is provided on one end side in a stroke direction of the piston in the cylinder to suck an active gas into the combustion chamber in accordance with the sliding movement of the piston; and a fuel injection unit which has an injection port located on the outside of the cylinder, and injects the fuel gas into the active gas sucked into the scavenge port. | 03-03-2016 |
| 20080302344 | Internal combustion engine and method of operating the same - An internal combustion engine has a cylinder ( | 12-11-2008 |
| 20100288252 | Non-Polluting Two-Stroke Engine with Air-Cooled Piston - A two-stroke internal combustion engine has at least one cylinder having a bore diameter, a central axis, a cylinder wall, and an upper and a lower extremity, a piston slip-fit in the cylinder, the piston having an overall height and a top surface, an upper portion and a lower portion each of approximately the bore diameter, each of the upper and lower portions having at least one seal ring between the piston and the cylinder wall, and a central portion of significantly less than the bore diameter and a height at least one-half of the overall piston height, providing an annular space between the central piston portion and the cylinder wall, a crank mechanism coupled to the piston in a manner providing a repeating stroke of a specific stroke length in the direction of the central axis of the cylinder, the repeating stroke providing a varying volume V between the top of the cylinder and the top surface of the piston, one or more exhaust ports through the cylinder wall, each exhaust port having a first height in the direction of the cylinder axis, centered at a first dimension from the top of the cylinder, one or more intake ports through the cylinder wall, each intake port having a second height in the direction of the cylinder axis, centered at a second dimension from the top of the cylinder, and a forced-air mechanism providing air to the one or more intake ports, wherein for a significant portion of every stroke both the one or more exhaust ports and the one or more intake ports are open to the annular space between the central piston portion and the cylinder wall, allowing the air pump to force air from the one or more intake ports around the central piston portion to the one or more exhaust ports. | 11-18-2010 |
| 20100288253 | AIR INTAKE PORTING FOR A TWO STROKE ENGINE - A two stroke engine of a particular configuration can have its power output increased by running bigger pistons and using ports in the piston skirt through which to conduct compressed air within the skirt through short passages in the cylinder housing that conduct the air from within the skirt to above the piston. As a result a larger piston can be used for the same spacing and opening size in the block to save the need to redesign the block and the crankshaft. A position adjuster for the piston moves it axially without rotation of the piston ports out of alignment with inlet ports in the housing. The piston rod is held in the crosshead using a flat to prevent rotation while an adjuster nut that is turned creates axial movement in the piston rod with a lock nut securing the final piston position. | 11-18-2010 |
| 20110017182 | TWO-STROKE INTERNAL COMBUSTION ENGINE - There is provided a loop-scavenged two-stroke internal combustion engine that is capable of effectively suppressing the short-circuiting of fresh charge (unburnt air-fuel mixture), while at the same time being capable of further improving scavenging efficiency, combustion efficiency, etc., as well as of improving the durability and output stability of a cylinder and a piston. One pair or a plurality of pairs of scavenging passages ( | 01-27-2011 |
| 20110017183 | TWO-STROKE INTERNAL COMBUSTION ENGINE - There is provided a reverse scavenged two-stroke internal combustion engine that is capable of effectively suppressing the short-circuiting of fresh charge (unburnt air-fuel mixture), while at the same time being capable of further improving scavenging efficiency, combustion efficiency, etc. The horizontal sectional shape of at least one pair of scavenging passages ( | 01-27-2011 |
| 20110079206 | TWO-STROKE ENGINE - In a two-stroke engine ( | 04-07-2011 |
| 20110146642 | Two-Stroke Engine, Sand Core for Producing a Two-Stroke Engine, and Method for Operating a Two-Stroke Engine - A two-stroke engine has a cylinder with a combustion chamber and a reciprocating piston for driving a crankshaft. Transfer passages connect the crankcase in at least one position of the piston with the combustion chamber and open by piston-controlled transfer ports into the combustion chamber. An inlet opens into the crankcase and an outlet is provided at the combustion chamber. The engine is dividable into four sectors parallel to a longitudinal cylinder axis. The transfer port of a first transfer passage is arranged in the first sector, the outlet is arranged in the second sector, the transfer port of a second transfer passage is provided in the third sector, and the inlet is arranged in the fourth sector. Within the cylinder the first and second transfer passages, at a spacing from a separation plane between cylinder and crankcase, pass together into one of the second and fourth sectors. | 06-23-2011 |
| 20110146643 | Two-Stroke Engine - A two-stroke engine has a cylinder with a combustion chamber and a piston reciprocatingly supported in the cylinder. A crankshaft is rotatably supported in a crankcase and driven by the piston. At least one transfer passage connects the crankcase in at least one position of the piston with the combustion chamber and has a piston-controlled transfer port that opens into the combustion chamber and an opening that opens into the crankcase. A mixture inlet opens into the crankcase. An outlet is provided at the combustion chamber. The transfer port and the opening are displaced relative to each other in a circumferential direction of the cylinder. At least one wall section of the transfer passage forms an undercut when viewed from the crankcase in a direction of a longitudinal cylinder axis of the cylinder and is delimited by a separate component inserted into the cylinder from a side facing the crankcase. | 06-23-2011 |
| 20110197868 | Two-stroke engine - A two-stroke engine ( | 08-18-2011 |
| 20110247601 | TWO-CYCLE ENGINE AND LOW EMISSION CONTROL SYSTEM - A two-cycle engine including exhaust, air inlet, scavenging and air/fuel intake windows disposed in the cylinder wall, a reciprocating piston driving a crankshaft, and curved gas-conveying channels connecting the crankcase chamber with the cylinder bore, the channels being opened by the reciprocating piston and the channels producing centrifugation of gases circulating therein to produce lean and rich components of an air/fuel mixture, wherein the lean component is circulated in a region of the combustion chamber remote from the exhaust window for promoting reduced combustion residues. | 10-13-2011 |
| 20110308507 | TWO-STROKE CYCLE COMBUSTION ENGINE OF AIR SCAVENGING TYPE - A two-stroke cycle combustion engine of an air scavenging type includes one or more scavenging passages ( | 12-22-2011 |
| 20120006308 | Piston for a Two-Stroke Engine - A transfer passage design for a two stroke internal combustion engine that allows for regulation of the air/fuel flow as the piston nears the bottom of its stroke. Additionally, a cut out in the skirt of the piston may allow for additional gaseous communication between the crankcase chamber and the transfer passage. | 01-12-2012 |
| 20120024276 | LOOP SCAVENGED TWO-STROKE INTERNAL COMBUSTION ENGINE - A loop scavenged two-stroke internal combustion engine which can effectively restrain blow-by of fresh gas with a relatively simple configuration is provided. A horizontal scavenging angle θb in at least one spot of a scavenging passage | 02-02-2012 |
| 20120060806 | Two-Stroke Engine - A two-stroke engine has a cylinder having a cylinder bore with a combustion chamber and an outlet connected with the combustion chamber. A piston is disposed in the cylinder and delimits the combustion chamber. The piston has a piston recess. A crankcase is provided that has a crankshaft rotatably supported therein. The piston drives in rotation the crankshaft. In at least one position of the piston, the crankcase is connected by a transfer passage with the combustion chamber. An air passage is provided as well as a mixture passage that has a mixture inlet that is disposed at the cylinder bore and opens into the cylinder bore and is piston-controlled. The transfer passage is connected by the piston recess to the air passage when the piston is at top dead center. The piston recess has a connection to the mixture inlet in at least one position of the piston. | 03-15-2012 |
| 20120247442 | STRATIFIED TWO-STROKE ENGINE - Various embodiments include two-stroke stratified engines and dual passage carburetors for use with gaseous fuel and liquid fuels. A stratified air-head engine having a simpler intake manifold with a single air pipe for induction of air is included. | 10-04-2012 |
| 20120260900 | STRATIFIED SCAVENGING TWO-CYCLE ENGINE - A laminar-scavenging two-cycle engine which has a high laminar-scavenging effect, includes a scavenging passage having a crankcase side portion extending along a crankcase, and a cylinder side portion extending along a cylinder and having a length larger than the sum of the diameter and stroke of the cylinder. An ambient air introducing passage for introducing leading air into the scavenging passage is connected to an intermediate portion of the scavenging passage. A notch for opening a scavenging port to the side of the crankcase when a piston is near the top dead center is formed in the piston. | 10-18-2012 |
| 20120325191 | SCAVENGING PASSAGE STRUCTURE FOR TWO-STROKE ENGINE - A scavenging passage structure for a two-stroke engine, having a scavenging passage communicating a scavenging port provided in a cylinder with a crank chamber formed inside a crankcase, the scavenging passage being formed to extend through respective fastening surfaces of the cylinder and the crankcase. The scavenging passage includes a cover member attached inside the crankcase to be in contact with an inner wall surface of the crankcase, and a groove formed in at least one of the inner wall surface of the crankcase contacting the cover member, and the cover member contacting the inner wall surface of the crankcase, the groove forming part of the scavenging passage connecting to the crank chamber and to an upper face of the crankcase. | 12-27-2012 |
| 20130037011 | Two-Stroke Internal Combustion Engine - It is intended to effectively prevent blow-by with no need for large changes in typical structures of two-cycle internal combustion engines. A main scavenging passage ( | 02-14-2013 |
| 20130061835 | Two-Stroke Engine and a Method for the Operation thereof - A two-stroke engine has a cylinder wherein a piston is journalled for reciprocating movement. The piston delimits a combustion chamber configured in the cylinder. The engine has an outlet from the combustion chamber and a transfer channel which opens at an inlet opening into the crankcase and at a transfer window in the combustion chamber. The piston drives a crankshaft via a connecting rod. The crankshaft is rotatably journalled in the crankcase. At least one control element for the inlet opening is connected to the crankshaft so as to rotate therewith. | 03-14-2013 |
| 20130068205 | TWO-STROKE ENGINE AND LUBRICATION - Various embodiments include a two-stroke engine and a carburetor for use with gaseous fuel, such as hydrogen, methane, liquid petroleum gas, pure propane, and butane. | 03-21-2013 |
| 20140060507 | ENGINE AND ENGINE-DRIVEN WORKING MACHINE - An engine and an engine-driven working machine which enable blow-though prevention of an uncombusted air-fuel mixture and control of the number of times of combustion, stabilize operation during idling, and ensure output and acceleration performance during working are provided. A two-cycle engine having: a piston; a crankcase in which scavenging passages are formed; and a cylinder in which scavenging ports communicated with the scavenging passages and an exhaust port for discharging a combustion gas are formed. In the two-cycle engine, at least two or more systems of the scavenging passages having mutually different opening/closing systems are formed in the crankcase. | 03-06-2014 |
| 20140182571 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A stratified scavenging two-stroke engine includes a first scavenging passage that extends from a first scavenging intake that opens to the inside of the crankcase to a first scavenging port that opens to the inside of a cylinder, and a second scavenging passage that extends from a second scavenging intake that opens to the inside of the crankcase to a second scavenging port that opens to the inside of the cylinder. The first and second passages are formed so as to communicate with each other via a communicating portion. An air passage is connected to the first passage at a position closer to the first scavenging intake than the communicating portion. A first check valve inhibits a flow from the first passage to the inside of the crankcase, and a second check valve inhibits a flow from the first passage through the air passage to the outside. | 07-03-2014 |
| 20140318517 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A stratified scavenging two-stroke engine includes: an intake passage that connects an intake opening through an outer surface of a cylinder member with an intake port opening to the inside of a cylinder, and supplies gaseous mixture of fuel and air; an exhaust passage that connects an exhaust outlet opening through the outer surface of the cylinder member with an exhaust port opening to the inside of the cylinder, and discharges combustion gas; a scavenging passage; and an air passage that connects an air inlet opening through the outer surface of the cylinder member with the scavenging passage and supplies pre-scavenging air into the scavenging passage. The intake and the air inlet are arranged at positions opposite from the exhaust port across the axis of the cylinder, and arranged side by side in a substantially circumferential direction of the cylinder or a direction substantially perpendicular to the axis of the cylinder. | 10-30-2014 |
| 20160069296 | TWO-STROKE ENGINE - A two-stroke engine has a cylinder with a combustion chamber formed therein. The combustion chamber is delimited by a piston. The cylinder has a base on which extends a partition plane whereat the cylinder is separated from a crankcase. The combustion chamber is, in at least one piston position, connected via at least one transfer channel to the crankcase interior. The transfer channel passes from the cylinder into the crankcase at at least one opening. A side wall of the transfer channel has, in the cylinder, a first region wherein the wall encloses an angle of 90° with the cylinder longitudinal axis. Between the first region and the opening as viewed in the cylinder circumferential direction is arranged a second wall region. The second region has a spacing, measured parallel to the cylinder longitudinal axis, to the partition plane. The spacing is greater than the spacing in the first region. | 03-10-2016 |
| 20160097344 | Air Leading-Type Stratified Scavenging Two-Stroke Internal-Combustion Engine - The efficiency of charging air to a scavenging channel is enhanced by generating a gas flow in a piston groove simultaneously with the piston groove coming into communication with an air port. A piston groove | 04-07-2016 |
| 20090095269 | Two-Cycle Engine - In a stratified scavenging two-cycle engine | 04-16-2009 |
| 20100037877 | TWO CYCLE ENGINE AND TWO CYCLE ENGINE TOOL - The invention provides a two cycle engine which effectively suppresses an intrusion of a combustion gas into a crank chamber. Further, the invention provides a two cycle engine tool provided with the two cycle engine mentioned above. An engine is provided with a cylinder having two scavenge air ports at different positions in a cylinder circumference direction, and scavenge air inflow ports communicating individually with these two scavenge air ports via a scavenge air passage, and a piston in which two scavenge air communication ports are formed at positions corresponding to the scavenge air inflow ports, and is structured to swirl the gas flowing into the piston from the cylinder through the scavenge air passage, in an upper portion of the internal space of the piston, and retains the gas in the upper portion of the internal space of the piston. | 02-18-2010 |
| 20110180054 | Two-Stroke Internal Combustion Engine and Its Scavenging Method - In a two-stroke internal combustion engine using air for scavenging its combustion chamber ( | 07-28-2011 |
| 20120024275 | TWO-STROKE INTERNAL COMBUSTION ENGINE - A two stroke crank case scavenged two-stroke internal combustion engine, the engine including: a cylinder ( | 02-02-2012 |
| 20130255652 | INTERNAL COMBUSTION ENGINE, IN PARTICULAR TWO-STROKE INTERNAL COMBUSTION ENGINE - To create an internal combustion engine including a crankcase and a cylinder, wherein a piston is guided in the cylinder to perform a stroke movement and movably defines a combustion chamber, and wherein at least one transfer channel, through which ignition mixture is guided from the crankcase into the combustion chamber, is arranged in the cylinder, which leads to a further improvement of the exhaust gas quality and/or of the fuel consumption, in particular for creating an improved metering of ignition mixture into the fuel chamber, it is proposed for the piston to encompass a lower piston edge, which interacts with at least one counter body such that an inlet cross section of the transfer channel for the inflow of the ignition mixture from the crankcase into the transfer channel can be controlled by the stroke movement of the piston by the lower piston edge. | 10-03-2013 |
| 20150337765 | Stratified Scavenging Two-Stroke Internal Combustion Engine And Carburetor Thereof - A carburetor achieves better emission characteristics while improving a combustion state by increasing a delivery ratio of a stratified scavenging engine and reducing intake resistance. No dividing wall is provided between a throttle valve | 11-26-2015 |
| 20150377117 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A stratified scavenging two-stroke engine includes a first scavenging passage that extends from a first scavenging intake that opens to the inside of the crankcase to a scavenging port that opens to the inside of a cylinder, and a second scavenging passage that branches from the first scavenging passage and extends to a second scavenging intake that opens to the inside of the crankcase. An air passage is provided to supply air for pre-scavenging into the first scavenging passage at a position closer to the first scavenging intake than a position at which the second scavenging passage branches from the first scavenging passage. A first check valve inhibits a flow of air from the first scavenging passage during an upward stroke of the piston, and a second check valve inhibits a flow of air and a gaseous mixture from the first scavenging passage during a downward stroke of the piston. | 12-31-2015 |
| 20160169087 | Air Leading Type Two-Stroke Engine And Intake System For Same, And Carburetor | 06-16-2016 |
| 20160376979 | Stratified Scavenging Two-Stroke Internal Combustion Engine, Air Cleaner Of The Same, And Intake Method - An amplitude of a pressure fluctuation in a vicinity of a main nozzle of a carburetor ( | 12-29-2016 |
| 20080308084 | CYLINDER/CRANKCASE GROUP FOR TWO-STROKE INTERNAL COMBUSTION ENGINES PROVIDED WITH MEANS FOR SUPERCHARGING THE ENGINE - A fuel injection system for a two-stroke internal combustion engine ( | 12-18-2008 |
| 20160252011 | TWO-CYCLE GAS ENGINE | 09-01-2016 |
| 20090283081 | AIR INTAKE PORTING FOR A TWO STROKE ENGINE - A two stroke engine of a particular configuration can have its power output increased by running bigger pistons and using ports in the piston skirt through which to conduct compressed air within the skirt through short passages in the cylinder housing that conduct the air from within the skirt to above the piston. As a result a larger piston can be used for the same spacing and opening size in the block to save the need to redesign the block and the crankshaft. A position adjuster for the piston moves it axially without rotation of the piston ports out of alignment with inlet ports in the housing. The piston rod is held in the crosshead using a flat to prevent rotation while an adjuster nut that is turned creates axial movement in the piston rod with a lock nut securing the final piston position. | 11-19-2009 |
| 20120097141 | TWO-STROKE ENGINE WITH A COMPRESSED-AIR-ASSISTED FUEL-INJECTION SYSTEM - A two-stroke internal combustion engine is provided and includes a casing, a cylinder, a piston skirt, an aspirating port, a carburetor which supplies the casing with an air/fuel mixture, through said aspirating port, a transfer conduit which opens into the cylinder through an air/fuel inlet port, and a fuel storage system, or resonance tube which communicates with a first port located above the aspirating port, and with a second port located below the aspirating port. The first port and the second port are alternatingly opened by the piston skirt, which includes a through-hole having a diameter between 0.5 and 3.0 mm. The through-hole being located, when the piston is mounted in the engine, in a same radial plane as the second port. | 04-26-2012 |
| 20120318250 | TWO-STROKE ENGINE - The two-stroke engine has a plurality of intake passages extending from the external air inlet port through the crankcase, separating the intake air charge from the air and oil vapor within the crankcase. The piston has one or more corresponding inlet tubes depending therefrom that telescope within the crankcase intake passages as the piston reciprocates. All intake air travels through these passages and is separated from the remainder of the crankcase volume. The incoming air charge passes through a concentric poppet valve in the piston crown to enter the combustion chamber. Fuel is provided by conventional direct or port injection and ignition is provided by one or more conventional spark plugs. Diesel operation is achievable when the engine is configured appropriately. Exhaust exits the combustion chamber through a poppet valve in the cylinder head, the poppet valve being actuated by a rocker arm and pushrod from a crankshaft driven cam. | 12-20-2012 |
| 20140331981 | AIR INTAKE PORTING FOR A TWO STROKE ENGINE - A two stroke engine of a particular configuration can have its power output increased by running bigger pistons and using ports in the piston skirt through which to conduct compressed air within the skirt through short passages in the cylinder housing that conduct the air from within the skirt to above the piston. As a result a larger piston can be used for the same spacing and opening size in the block to save the need to redesign the block and the crankshaft. A position adjuster for the piston moves it axially without rotation of the piston ports out of alignment with inlet ports in the housing. The piston rod is held in the crosshead using a flat to prevent rotation while an adjuster nut that is turned creates axial movement in the piston rod with a lock nut securing the final piston position. | 11-13-2014 |
| 20150345372 | ASYMMETRIC TRANSFER AND INTAKE IN TWO-STROKES - With shaped connecting rod, piston and cylinder, an advantageous asymmetric timing of the two-stroke engine is achieved, wherein the combustion chamber communicates with the crankcase through a transfer port controlled by the piston and through a respective piston port controlled by the connecting rod, with the transfer port and its respective piston port arranged “in series”, and wherein an intake port communicates with the crankcase through a piston port controlled by the connecting rod, with the intake port and its respective piston port arranged “in series”. | 12-03-2015 |
| 20090007894 | Two-Cycle Engine - A stratified scavenging two-cycle engine includes: an air passage for delivering pure air to a scavenging passage; an air valve for opening and closing the air passage; and an auxiliary air passage for delivering the pare air to the scavenging passage when the air valve is completely closed. An amount of air for air-fuel mixture sucked in a crank chamber is reduced to increase the concentration of the air-fuel mixture, and air that supplements the reduced amount of the air for air-fuel mixture is fed into the scavenging passage through the auxiliary air passage, which enables the engine to be smoothly accelerated even when being suddenly accelerated from an idling state with an appropriate concentration of the air-fuel mixture sucked in a cylinder chamber during idling. | 01-08-2009 |
| 20110162630 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A two-stroke engine is provided with a piston, a cylinder that houses the piston in a manner allowing reciprocation, a crankshaft that is connected to the piston via a connecting rod, a crankcase that houses the crankshaft in a manner allowing rotation, a mixture gas passage that introduces mixture gas into the crankcase, a scavenging passage that extends between a scavenging intake that opens into the crankcase and a scavenging port that opens into the cylinder; and an air passage that is connected to an intermediate position of the scavenging passage for introducing air into the scavenging passage. The engine is adapted such that, in a part of an upward stroke period of the piston, the crankcase in which negative pressure is generated is connected to the scavenging passage via the scavenging port. Accordingly, most of air introduced into the scavenging passage form the air passage flows toward the scavenging port and into the cylinder without changing the direction of flow. | 07-07-2011 |
| 20120097142 | PRE-COMBUSTION CYCLE PRESSURISATION SYSTEM - A two stroke internal combustion engine ( | 04-26-2012 |
| 20130092137 | FIXING DEVICE FOR TWO-STROKE ENGINE - A two-stroke engine includes a cylinder, a combustion chamber formed in a cylinder running surface, and a cylinder head and with an outlet port of the combustion chamber. A transfer port is formed in the cylinder in order to connect the interior space of a crankcase of the two-stroke engine with the combustion chamber. The cylinder includes an axial bore, at least partially penetrating a wall of the outlet port and/or of the transfer port, so that the bore at least partially forms an opening at the wall side in the outlet port and/or in the transfer port. A pin is in the bore. The pin closes the opening at the wall side in such a way that the original surface of the wall of the outlet port and/or of the transfer port is substantially restored in the area of the opening at the wall side. | 04-18-2013 |
| 20130037010 | UNIFLOW PORT-LESS TWO-STROKE ENGINE - Uniflow two-stroke engines without ports on the cylinder and with four-stroke lubrication | 02-14-2013 |
| 20140251293 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A two-stroke engine is provided with a scavenging passage that extends between a scavenging intake that opens into a crankcase and a scavenging port that opens into a cylinder, and an air passage that is connected to an intermediate position of a scavenging passage for introducing air into the scavenging passage. A first check valve that is disposed within a section of a scavenging passage between a scavenging intake and the intermediate position. A second check valve that is disposed within the air passage. The section of the scavenging passage between the intermediate position and the scavenging intake, the air passage, and a mixture gas passage are arranged in a substantially same direction with respect to a longitudinal axis of the cylinder. | 09-11-2014 |
| 123073000 | Ported piston | 7 |
| 20080302345 | A Crankcase Scavenged Two-Stroke Internal Combustion Engine Having an Additional Air Supply - A crankcase scavenged two-stroke internal combustion engine ( | 12-11-2008 |
| 20090056687 | Two-stroke, homogeneous charge, spark-ignition engine - A method for combusting fuel in an engine involving decreasing a first volume of air to a third volume, in two stages, the first stage in a crankcase compressor decreasing a first volume of air to a second volume and a second stage in the engine cylinder decreasing a second volume of a gas to a third volume, injection of fuel between the two stages into partially compressed hot air to provide homogenous charge to the cylinder to begin second stage compression in the cylinder having two variable compression ratios, a first variable compression ratio for low loads to reach a compression temperature slightly below the autoignition temperature of the homogeneous charge such that spark ignited HCCI-like combustion being emission free, a second much smaller variable compression ratio for preventing pre-ignition at high loads, then increasing the pressure at constant volume via combusting homogeneous charge in the cylinder, increasing the third volume of gas to a fourth volume (an expansion process having a chosen expansion ratio much greater than the compression ratio), decreasing the pressure to atmospheric pressure while removing heat under constant volume, and finally decreasing the volume of gas to the first volume while removing heat under constant pressure to complete a two-stroke homogeneous charge spark-ignition cycle. Also disclosed is an engine employing the two-stroke HCSI cycle. | 03-05-2009 |
| 20090308369 | Laminated Counterweight for Timing Control - A stratified two-stroke engine having a laminated counterweight is disclosed. The laminated counterweight includes a traditional counterweight portion and a laminate portion. The laminate portion has an approximately circular peripheral shape and at least one notch. In operation, the notch may be used to time the opening and closing of a mixture port or a transfer port. | 12-17-2009 |
| 20100012106 | STRATIFIED SCAVENGING TWO-CYCLE ENGINE - Provided is a laminar-scavenging two-cycle engine, which can have a higher laminar-scavenging effect than that of the laminar-scavenging two-cycle engine of the prior art and which can expect drastically excellent effects on the stabilization of combustion and on the blow-by prevention. The laminar-scavenging two-cycle engine is characterized in that a scavenging passage ( | 01-21-2010 |
| 20100059030 | Stratified Scavenging Two-Cycle Engine - A stratified scavenging two-cycle engine that has a simpler structure than conventional stratified scavenging two-cycle engines and that has an excellent blow-by prevention effect etc. In an air intake stroke, lead air passes a lead-air port ( | 03-11-2010 |
| 20100139637 | TWO-STROKE ENGINE - An object is to provide a two-stroke engine achieving effective reduction of blow-by while implementing efficient gas exchange. In a two-stroke engine | 06-10-2010 |
| 20100170485 | TWO STROKE COMBUSTION ENGINE - The invention related to a two-stroke internal combustion engine ( | 07-08-2010 |
| 20100252011 | IDLE SPEED CONTROL FOR A HANDHELD POWER TOOL - Method for controlling fuel metering in a carburetor or a low pressure injection system of an internal combustion engine when the engine is operating at idle speed, the method includes the steps of:
| 10-07-2010 |
| 20100307469 | Method for operating a two-stroke engine - A two-stroke engine ( | 12-09-2010 |
| 20120145137 | TWO-CYCLE ENGINE - An engine includes a cylinder block, and a piston slidably mounted in a cylinder, with the cylinder block being formed with an exhaust passage leading to a combustion chamber through an exhaust port, a first scavenging port opened to an inner circumferential surface of the cylinder, a first communication passage formed from the first scavenging port in a radial direction of the cylinder, and a first scavenging passage formed with an opening on a bottom surface of the first communication passage, in which a side surface on a far side from the exhaust port forming the communication passage is formed towards the far side from the exhaust port in the combustion chamber, and the opening portion of the first scavenging passage and a landing portion formed in the periphery of the opening portion are formed at a bottom portion of the communication passage. | 06-14-2012 |
| 20120152217 | TWO-STROKE ENGINE - A two-stroke engine has a cylinder with a combustion chamber which is bounded by a piston which drives a crankshaft which rotates in a crankcase. The crankcase is connected to the combustion chamber via an overflow passage in the lower dead centre region of the piston. The two stroke engine has an intake passage. A carburetor forms a section of the intake passage. The intake passage is partially divided into an air passage, which supplies combustion air into an overflow passage, and a mixture passage which opens into the crankcase. A throttle valve mounted pivotably in the carburetor controls the combustion air quantity supplied to the air and mixture passages. An air-guiding element arranged on the passage wall of the air passage guides the combustion air passing between the throttle valve and passage wall in the idling position of the throttle valve in the direction of the mixture passage. | 06-21-2012 |
| 20120152218 | TWO-STROKE ENGINE - A two-stroke engine, comprising: a crankcase; a cylinder connected to said crankcase; a combustion chamber defined by a reciprocally mounted piston within said cylinder; a crankshaft mounted rotatably in said crankcase and drivingly connected with said piston; at least one overflow passage connecting the crankcase and the combustion chamber when the piston is positioned in the lower dead center region; a connecting stub attached to said cylinder which contains an intake passage that opens into the crankcase and supplies fuel and combustion air, said intake passage including therein an air-fuel mixture passage, wherein said connecting stub contains at least one section of the mixture passage; at least one fuel opening for supplying fuel into said mixture passage; and a guiding rib positioned within said connecting stub and oriented longitudinally in the mixture passage and protruding into the mixture passage. | 06-21-2012 |
| 20120304973 | Two-Stroke Engine - An engine has a cylinder wherein a reciprocating piston is mounted. The piston drives, via a connecting rod ( | 12-06-2012 |
| 20140238371 | Two-Stroke Internal Combustion Engine - The scavenging passage includes a wall surface that defines an orientation direction of a main scavenging gas flow spouting from the scavenging port to the cylinder chamber. In a boundary portion between the scavenging port and the scavenging passage, a wall surface located on an opposite side of the exhaust port is composed of an inclined surface inclined in a direction further away from the exhaust port than a wall surface of a deep portion of the scavenging passage. The scavenging port includes a rear wall surface located in a portion on the opposite side of the exhaust port. The rear wall surface continues to the inclined surface to extend in the direction away from the exhaust port and generates an incidental scavenging gas flow incidental to the main scavenging gas flow and higher in speed than the main scavenging gas flow. | 08-28-2014 |
| 20140318518 | OPPOSED PISTON INTERNAL COMBUSTION ENGINE WITH INVISCID LAYER SEALING - An opposed-piston engine that forms an inviscid layer between pistons and the respective cylinder walls. In an aspect, the opposed-piston engine utilizes a Scotch yoke assembly that includes rigidly connected opposed combustion pistons. In an aspect, the Scotch yoke assembly is configured to transfer power from the combustion pistons to a crankshaft assembly. In an aspect, the crankshaft assembly can be configured to have dual flywheels that are internal to the engine, and can be configured to assist with an exhaust system, a detonation system, and/or a lubrication system. | 10-30-2014 |
| 20160061097 | UNIFLOW SCAVENGING 2-CYCLE ENGINE - A uniflow scavenging 2-cycle engine includes a cylinder inside which a combustion chamber is formed; a piston which slides within the cylinder; a scavenge port which is provided on one end side in a stroke direction of the piston in the cylinder to suck an active gas into the combustion chamber in accordance with the sliding movement of the piston; and a fuel injection unit which has an injection port located on the outside of the cylinder, and injects the fuel gas into the active gas sucked into the scavenge port. | 03-03-2016 |
| 20080302344 | Internal combustion engine and method of operating the same - An internal combustion engine has a cylinder ( | 12-11-2008 |
| 20100288252 | Non-Polluting Two-Stroke Engine with Air-Cooled Piston - A two-stroke internal combustion engine has at least one cylinder having a bore diameter, a central axis, a cylinder wall, and an upper and a lower extremity, a piston slip-fit in the cylinder, the piston having an overall height and a top surface, an upper portion and a lower portion each of approximately the bore diameter, each of the upper and lower portions having at least one seal ring between the piston and the cylinder wall, and a central portion of significantly less than the bore diameter and a height at least one-half of the overall piston height, providing an annular space between the central piston portion and the cylinder wall, a crank mechanism coupled to the piston in a manner providing a repeating stroke of a specific stroke length in the direction of the central axis of the cylinder, the repeating stroke providing a varying volume V between the top of the cylinder and the top surface of the piston, one or more exhaust ports through the cylinder wall, each exhaust port having a first height in the direction of the cylinder axis, centered at a first dimension from the top of the cylinder, one or more intake ports through the cylinder wall, each intake port having a second height in the direction of the cylinder axis, centered at a second dimension from the top of the cylinder, and a forced-air mechanism providing air to the one or more intake ports, wherein for a significant portion of every stroke both the one or more exhaust ports and the one or more intake ports are open to the annular space between the central piston portion and the cylinder wall, allowing the air pump to force air from the one or more intake ports around the central piston portion to the one or more exhaust ports. | 11-18-2010 |
| 20100288253 | AIR INTAKE PORTING FOR A TWO STROKE ENGINE - A two stroke engine of a particular configuration can have its power output increased by running bigger pistons and using ports in the piston skirt through which to conduct compressed air within the skirt through short passages in the cylinder housing that conduct the air from within the skirt to above the piston. As a result a larger piston can be used for the same spacing and opening size in the block to save the need to redesign the block and the crankshaft. A position adjuster for the piston moves it axially without rotation of the piston ports out of alignment with inlet ports in the housing. The piston rod is held in the crosshead using a flat to prevent rotation while an adjuster nut that is turned creates axial movement in the piston rod with a lock nut securing the final piston position. | 11-18-2010 |
| 20110017182 | TWO-STROKE INTERNAL COMBUSTION ENGINE - There is provided a loop-scavenged two-stroke internal combustion engine that is capable of effectively suppressing the short-circuiting of fresh charge (unburnt air-fuel mixture), while at the same time being capable of further improving scavenging efficiency, combustion efficiency, etc., as well as of improving the durability and output stability of a cylinder and a piston. One pair or a plurality of pairs of scavenging passages ( | 01-27-2011 |
| 20110017183 | TWO-STROKE INTERNAL COMBUSTION ENGINE - There is provided a reverse scavenged two-stroke internal combustion engine that is capable of effectively suppressing the short-circuiting of fresh charge (unburnt air-fuel mixture), while at the same time being capable of further improving scavenging efficiency, combustion efficiency, etc. The horizontal sectional shape of at least one pair of scavenging passages ( | 01-27-2011 |
| 20110079206 | TWO-STROKE ENGINE - In a two-stroke engine ( | 04-07-2011 |
| 20110146642 | Two-Stroke Engine, Sand Core for Producing a Two-Stroke Engine, and Method for Operating a Two-Stroke Engine - A two-stroke engine has a cylinder with a combustion chamber and a reciprocating piston for driving a crankshaft. Transfer passages connect the crankcase in at least one position of the piston with the combustion chamber and open by piston-controlled transfer ports into the combustion chamber. An inlet opens into the crankcase and an outlet is provided at the combustion chamber. The engine is dividable into four sectors parallel to a longitudinal cylinder axis. The transfer port of a first transfer passage is arranged in the first sector, the outlet is arranged in the second sector, the transfer port of a second transfer passage is provided in the third sector, and the inlet is arranged in the fourth sector. Within the cylinder the first and second transfer passages, at a spacing from a separation plane between cylinder and crankcase, pass together into one of the second and fourth sectors. | 06-23-2011 |
| 20110146643 | Two-Stroke Engine - A two-stroke engine has a cylinder with a combustion chamber and a piston reciprocatingly supported in the cylinder. A crankshaft is rotatably supported in a crankcase and driven by the piston. At least one transfer passage connects the crankcase in at least one position of the piston with the combustion chamber and has a piston-controlled transfer port that opens into the combustion chamber and an opening that opens into the crankcase. A mixture inlet opens into the crankcase. An outlet is provided at the combustion chamber. The transfer port and the opening are displaced relative to each other in a circumferential direction of the cylinder. At least one wall section of the transfer passage forms an undercut when viewed from the crankcase in a direction of a longitudinal cylinder axis of the cylinder and is delimited by a separate component inserted into the cylinder from a side facing the crankcase. | 06-23-2011 |
| 20110197868 | Two-stroke engine - A two-stroke engine ( | 08-18-2011 |
| 20110247601 | TWO-CYCLE ENGINE AND LOW EMISSION CONTROL SYSTEM - A two-cycle engine including exhaust, air inlet, scavenging and air/fuel intake windows disposed in the cylinder wall, a reciprocating piston driving a crankshaft, and curved gas-conveying channels connecting the crankcase chamber with the cylinder bore, the channels being opened by the reciprocating piston and the channels producing centrifugation of gases circulating therein to produce lean and rich components of an air/fuel mixture, wherein the lean component is circulated in a region of the combustion chamber remote from the exhaust window for promoting reduced combustion residues. | 10-13-2011 |
| 20110308507 | TWO-STROKE CYCLE COMBUSTION ENGINE OF AIR SCAVENGING TYPE - A two-stroke cycle combustion engine of an air scavenging type includes one or more scavenging passages ( | 12-22-2011 |
| 20120006308 | Piston for a Two-Stroke Engine - A transfer passage design for a two stroke internal combustion engine that allows for regulation of the air/fuel flow as the piston nears the bottom of its stroke. Additionally, a cut out in the skirt of the piston may allow for additional gaseous communication between the crankcase chamber and the transfer passage. | 01-12-2012 |
| 20120024276 | LOOP SCAVENGED TWO-STROKE INTERNAL COMBUSTION ENGINE - A loop scavenged two-stroke internal combustion engine which can effectively restrain blow-by of fresh gas with a relatively simple configuration is provided. A horizontal scavenging angle θb in at least one spot of a scavenging passage | 02-02-2012 |
| 20120060806 | Two-Stroke Engine - A two-stroke engine has a cylinder having a cylinder bore with a combustion chamber and an outlet connected with the combustion chamber. A piston is disposed in the cylinder and delimits the combustion chamber. The piston has a piston recess. A crankcase is provided that has a crankshaft rotatably supported therein. The piston drives in rotation the crankshaft. In at least one position of the piston, the crankcase is connected by a transfer passage with the combustion chamber. An air passage is provided as well as a mixture passage that has a mixture inlet that is disposed at the cylinder bore and opens into the cylinder bore and is piston-controlled. The transfer passage is connected by the piston recess to the air passage when the piston is at top dead center. The piston recess has a connection to the mixture inlet in at least one position of the piston. | 03-15-2012 |
| 20120247442 | STRATIFIED TWO-STROKE ENGINE - Various embodiments include two-stroke stratified engines and dual passage carburetors for use with gaseous fuel and liquid fuels. A stratified air-head engine having a simpler intake manifold with a single air pipe for induction of air is included. | 10-04-2012 |
| 20120260900 | STRATIFIED SCAVENGING TWO-CYCLE ENGINE - A laminar-scavenging two-cycle engine which has a high laminar-scavenging effect, includes a scavenging passage having a crankcase side portion extending along a crankcase, and a cylinder side portion extending along a cylinder and having a length larger than the sum of the diameter and stroke of the cylinder. An ambient air introducing passage for introducing leading air into the scavenging passage is connected to an intermediate portion of the scavenging passage. A notch for opening a scavenging port to the side of the crankcase when a piston is near the top dead center is formed in the piston. | 10-18-2012 |
| 20120325191 | SCAVENGING PASSAGE STRUCTURE FOR TWO-STROKE ENGINE - A scavenging passage structure for a two-stroke engine, having a scavenging passage communicating a scavenging port provided in a cylinder with a crank chamber formed inside a crankcase, the scavenging passage being formed to extend through respective fastening surfaces of the cylinder and the crankcase. The scavenging passage includes a cover member attached inside the crankcase to be in contact with an inner wall surface of the crankcase, and a groove formed in at least one of the inner wall surface of the crankcase contacting the cover member, and the cover member contacting the inner wall surface of the crankcase, the groove forming part of the scavenging passage connecting to the crank chamber and to an upper face of the crankcase. | 12-27-2012 |
| 20130037011 | Two-Stroke Internal Combustion Engine - It is intended to effectively prevent blow-by with no need for large changes in typical structures of two-cycle internal combustion engines. A main scavenging passage ( | 02-14-2013 |
| 20130061835 | Two-Stroke Engine and a Method for the Operation thereof - A two-stroke engine has a cylinder wherein a piston is journalled for reciprocating movement. The piston delimits a combustion chamber configured in the cylinder. The engine has an outlet from the combustion chamber and a transfer channel which opens at an inlet opening into the crankcase and at a transfer window in the combustion chamber. The piston drives a crankshaft via a connecting rod. The crankshaft is rotatably journalled in the crankcase. At least one control element for the inlet opening is connected to the crankshaft so as to rotate therewith. | 03-14-2013 |
| 20130068205 | TWO-STROKE ENGINE AND LUBRICATION - Various embodiments include a two-stroke engine and a carburetor for use with gaseous fuel, such as hydrogen, methane, liquid petroleum gas, pure propane, and butane. | 03-21-2013 |
| 20140060507 | ENGINE AND ENGINE-DRIVEN WORKING MACHINE - An engine and an engine-driven working machine which enable blow-though prevention of an uncombusted air-fuel mixture and control of the number of times of combustion, stabilize operation during idling, and ensure output and acceleration performance during working are provided. A two-cycle engine having: a piston; a crankcase in which scavenging passages are formed; and a cylinder in which scavenging ports communicated with the scavenging passages and an exhaust port for discharging a combustion gas are formed. In the two-cycle engine, at least two or more systems of the scavenging passages having mutually different opening/closing systems are formed in the crankcase. | 03-06-2014 |
| 20140182571 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A stratified scavenging two-stroke engine includes a first scavenging passage that extends from a first scavenging intake that opens to the inside of the crankcase to a first scavenging port that opens to the inside of a cylinder, and a second scavenging passage that extends from a second scavenging intake that opens to the inside of the crankcase to a second scavenging port that opens to the inside of the cylinder. The first and second passages are formed so as to communicate with each other via a communicating portion. An air passage is connected to the first passage at a position closer to the first scavenging intake than the communicating portion. A first check valve inhibits a flow from the first passage to the inside of the crankcase, and a second check valve inhibits a flow from the first passage through the air passage to the outside. | 07-03-2014 |
| 20140318517 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A stratified scavenging two-stroke engine includes: an intake passage that connects an intake opening through an outer surface of a cylinder member with an intake port opening to the inside of a cylinder, and supplies gaseous mixture of fuel and air; an exhaust passage that connects an exhaust outlet opening through the outer surface of the cylinder member with an exhaust port opening to the inside of the cylinder, and discharges combustion gas; a scavenging passage; and an air passage that connects an air inlet opening through the outer surface of the cylinder member with the scavenging passage and supplies pre-scavenging air into the scavenging passage. The intake and the air inlet are arranged at positions opposite from the exhaust port across the axis of the cylinder, and arranged side by side in a substantially circumferential direction of the cylinder or a direction substantially perpendicular to the axis of the cylinder. | 10-30-2014 |
| 20160069296 | TWO-STROKE ENGINE - A two-stroke engine has a cylinder with a combustion chamber formed therein. The combustion chamber is delimited by a piston. The cylinder has a base on which extends a partition plane whereat the cylinder is separated from a crankcase. The combustion chamber is, in at least one piston position, connected via at least one transfer channel to the crankcase interior. The transfer channel passes from the cylinder into the crankcase at at least one opening. A side wall of the transfer channel has, in the cylinder, a first region wherein the wall encloses an angle of 90° with the cylinder longitudinal axis. Between the first region and the opening as viewed in the cylinder circumferential direction is arranged a second wall region. The second region has a spacing, measured parallel to the cylinder longitudinal axis, to the partition plane. The spacing is greater than the spacing in the first region. | 03-10-2016 |
| 20160097344 | Air Leading-Type Stratified Scavenging Two-Stroke Internal-Combustion Engine - The efficiency of charging air to a scavenging channel is enhanced by generating a gas flow in a piston groove simultaneously with the piston groove coming into communication with an air port. A piston groove | 04-07-2016 |
| 20090095269 | Two-Cycle Engine - In a stratified scavenging two-cycle engine | 04-16-2009 |
| 20100037877 | TWO CYCLE ENGINE AND TWO CYCLE ENGINE TOOL - The invention provides a two cycle engine which effectively suppresses an intrusion of a combustion gas into a crank chamber. Further, the invention provides a two cycle engine tool provided with the two cycle engine mentioned above. An engine is provided with a cylinder having two scavenge air ports at different positions in a cylinder circumference direction, and scavenge air inflow ports communicating individually with these two scavenge air ports via a scavenge air passage, and a piston in which two scavenge air communication ports are formed at positions corresponding to the scavenge air inflow ports, and is structured to swirl the gas flowing into the piston from the cylinder through the scavenge air passage, in an upper portion of the internal space of the piston, and retains the gas in the upper portion of the internal space of the piston. | 02-18-2010 |
| 20110180054 | Two-Stroke Internal Combustion Engine and Its Scavenging Method - In a two-stroke internal combustion engine using air for scavenging its combustion chamber ( | 07-28-2011 |
| 20120024275 | TWO-STROKE INTERNAL COMBUSTION ENGINE - A two stroke crank case scavenged two-stroke internal combustion engine, the engine including: a cylinder ( | 02-02-2012 |
| 20130255652 | INTERNAL COMBUSTION ENGINE, IN PARTICULAR TWO-STROKE INTERNAL COMBUSTION ENGINE - To create an internal combustion engine including a crankcase and a cylinder, wherein a piston is guided in the cylinder to perform a stroke movement and movably defines a combustion chamber, and wherein at least one transfer channel, through which ignition mixture is guided from the crankcase into the combustion chamber, is arranged in the cylinder, which leads to a further improvement of the exhaust gas quality and/or of the fuel consumption, in particular for creating an improved metering of ignition mixture into the fuel chamber, it is proposed for the piston to encompass a lower piston edge, which interacts with at least one counter body such that an inlet cross section of the transfer channel for the inflow of the ignition mixture from the crankcase into the transfer channel can be controlled by the stroke movement of the piston by the lower piston edge. | 10-03-2013 |
| 20150337765 | Stratified Scavenging Two-Stroke Internal Combustion Engine And Carburetor Thereof - A carburetor achieves better emission characteristics while improving a combustion state by increasing a delivery ratio of a stratified scavenging engine and reducing intake resistance. No dividing wall is provided between a throttle valve | 11-26-2015 |
| 20150377117 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A stratified scavenging two-stroke engine includes a first scavenging passage that extends from a first scavenging intake that opens to the inside of the crankcase to a scavenging port that opens to the inside of a cylinder, and a second scavenging passage that branches from the first scavenging passage and extends to a second scavenging intake that opens to the inside of the crankcase. An air passage is provided to supply air for pre-scavenging into the first scavenging passage at a position closer to the first scavenging intake than a position at which the second scavenging passage branches from the first scavenging passage. A first check valve inhibits a flow of air from the first scavenging passage during an upward stroke of the piston, and a second check valve inhibits a flow of air and a gaseous mixture from the first scavenging passage during a downward stroke of the piston. | 12-31-2015 |
| 20160169087 | Air Leading Type Two-Stroke Engine And Intake System For Same, And Carburetor | 06-16-2016 |
| 20160376979 | Stratified Scavenging Two-Stroke Internal Combustion Engine, Air Cleaner Of The Same, And Intake Method - An amplitude of a pressure fluctuation in a vicinity of a main nozzle of a carburetor ( | 12-29-2016 |
| 20080308084 | CYLINDER/CRANKCASE GROUP FOR TWO-STROKE INTERNAL COMBUSTION ENGINES PROVIDED WITH MEANS FOR SUPERCHARGING THE ENGINE - A fuel injection system for a two-stroke internal combustion engine ( | 12-18-2008 |
| 20160252011 | TWO-CYCLE GAS ENGINE | 09-01-2016 |
| 20090283081 | AIR INTAKE PORTING FOR A TWO STROKE ENGINE - A two stroke engine of a particular configuration can have its power output increased by running bigger pistons and using ports in the piston skirt through which to conduct compressed air within the skirt through short passages in the cylinder housing that conduct the air from within the skirt to above the piston. As a result a larger piston can be used for the same spacing and opening size in the block to save the need to redesign the block and the crankshaft. A position adjuster for the piston moves it axially without rotation of the piston ports out of alignment with inlet ports in the housing. The piston rod is held in the crosshead using a flat to prevent rotation while an adjuster nut that is turned creates axial movement in the piston rod with a lock nut securing the final piston position. | 11-19-2009 |
| 20120097141 | TWO-STROKE ENGINE WITH A COMPRESSED-AIR-ASSISTED FUEL-INJECTION SYSTEM - A two-stroke internal combustion engine is provided and includes a casing, a cylinder, a piston skirt, an aspirating port, a carburetor which supplies the casing with an air/fuel mixture, through said aspirating port, a transfer conduit which opens into the cylinder through an air/fuel inlet port, and a fuel storage system, or resonance tube which communicates with a first port located above the aspirating port, and with a second port located below the aspirating port. The first port and the second port are alternatingly opened by the piston skirt, which includes a through-hole having a diameter between 0.5 and 3.0 mm. The through-hole being located, when the piston is mounted in the engine, in a same radial plane as the second port. | 04-26-2012 |
| 20120318250 | TWO-STROKE ENGINE - The two-stroke engine has a plurality of intake passages extending from the external air inlet port through the crankcase, separating the intake air charge from the air and oil vapor within the crankcase. The piston has one or more corresponding inlet tubes depending therefrom that telescope within the crankcase intake passages as the piston reciprocates. All intake air travels through these passages and is separated from the remainder of the crankcase volume. The incoming air charge passes through a concentric poppet valve in the piston crown to enter the combustion chamber. Fuel is provided by conventional direct or port injection and ignition is provided by one or more conventional spark plugs. Diesel operation is achievable when the engine is configured appropriately. Exhaust exits the combustion chamber through a poppet valve in the cylinder head, the poppet valve being actuated by a rocker arm and pushrod from a crankshaft driven cam. | 12-20-2012 |
| 20140331981 | AIR INTAKE PORTING FOR A TWO STROKE ENGINE - A two stroke engine of a particular configuration can have its power output increased by running bigger pistons and using ports in the piston skirt through which to conduct compressed air within the skirt through short passages in the cylinder housing that conduct the air from within the skirt to above the piston. As a result a larger piston can be used for the same spacing and opening size in the block to save the need to redesign the block and the crankshaft. A position adjuster for the piston moves it axially without rotation of the piston ports out of alignment with inlet ports in the housing. The piston rod is held in the crosshead using a flat to prevent rotation while an adjuster nut that is turned creates axial movement in the piston rod with a lock nut securing the final piston position. | 11-13-2014 |
| 20150345372 | ASYMMETRIC TRANSFER AND INTAKE IN TWO-STROKES - With shaped connecting rod, piston and cylinder, an advantageous asymmetric timing of the two-stroke engine is achieved, wherein the combustion chamber communicates with the crankcase through a transfer port controlled by the piston and through a respective piston port controlled by the connecting rod, with the transfer port and its respective piston port arranged “in series”, and wherein an intake port communicates with the crankcase through a piston port controlled by the connecting rod, with the intake port and its respective piston port arranged “in series”. | 12-03-2015 |
| 20090007894 | Two-Cycle Engine - A stratified scavenging two-cycle engine includes: an air passage for delivering pure air to a scavenging passage; an air valve for opening and closing the air passage; and an auxiliary air passage for delivering the pare air to the scavenging passage when the air valve is completely closed. An amount of air for air-fuel mixture sucked in a crank chamber is reduced to increase the concentration of the air-fuel mixture, and air that supplements the reduced amount of the air for air-fuel mixture is fed into the scavenging passage through the auxiliary air passage, which enables the engine to be smoothly accelerated even when being suddenly accelerated from an idling state with an appropriate concentration of the air-fuel mixture sucked in a cylinder chamber during idling. | 01-08-2009 |
| 20110162630 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A two-stroke engine is provided with a piston, a cylinder that houses the piston in a manner allowing reciprocation, a crankshaft that is connected to the piston via a connecting rod, a crankcase that houses the crankshaft in a manner allowing rotation, a mixture gas passage that introduces mixture gas into the crankcase, a scavenging passage that extends between a scavenging intake that opens into the crankcase and a scavenging port that opens into the cylinder; and an air passage that is connected to an intermediate position of the scavenging passage for introducing air into the scavenging passage. The engine is adapted such that, in a part of an upward stroke period of the piston, the crankcase in which negative pressure is generated is connected to the scavenging passage via the scavenging port. Accordingly, most of air introduced into the scavenging passage form the air passage flows toward the scavenging port and into the cylinder without changing the direction of flow. | 07-07-2011 |
| 20120097142 | PRE-COMBUSTION CYCLE PRESSURISATION SYSTEM - A two stroke internal combustion engine ( | 04-26-2012 |
| 20130092137 | FIXING DEVICE FOR TWO-STROKE ENGINE - A two-stroke engine includes a cylinder, a combustion chamber formed in a cylinder running surface, and a cylinder head and with an outlet port of the combustion chamber. A transfer port is formed in the cylinder in order to connect the interior space of a crankcase of the two-stroke engine with the combustion chamber. The cylinder includes an axial bore, at least partially penetrating a wall of the outlet port and/or of the transfer port, so that the bore at least partially forms an opening at the wall side in the outlet port and/or in the transfer port. A pin is in the bore. The pin closes the opening at the wall side in such a way that the original surface of the wall of the outlet port and/or of the transfer port is substantially restored in the area of the opening at the wall side. | 04-18-2013 |
| 20130037010 | UNIFLOW PORT-LESS TWO-STROKE ENGINE - Uniflow two-stroke engines without ports on the cylinder and with four-stroke lubrication | 02-14-2013 |
| 20140251293 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A two-stroke engine is provided with a scavenging passage that extends between a scavenging intake that opens into a crankcase and a scavenging port that opens into a cylinder, and an air passage that is connected to an intermediate position of a scavenging passage for introducing air into the scavenging passage. A first check valve that is disposed within a section of a scavenging passage between a scavenging intake and the intermediate position. A second check valve that is disposed within the air passage. The section of the scavenging passage between the intermediate position and the scavenging intake, the air passage, and a mixture gas passage are arranged in a substantially same direction with respect to a longitudinal axis of the cylinder. | 09-11-2014 |
| 123073000 | Valved | 2 |
| 20080302345 | A Crankcase Scavenged Two-Stroke Internal Combustion Engine Having an Additional Air Supply - A crankcase scavenged two-stroke internal combustion engine ( | 12-11-2008 |
| 20090056687 | Two-stroke, homogeneous charge, spark-ignition engine - A method for combusting fuel in an engine involving decreasing a first volume of air to a third volume, in two stages, the first stage in a crankcase compressor decreasing a first volume of air to a second volume and a second stage in the engine cylinder decreasing a second volume of a gas to a third volume, injection of fuel between the two stages into partially compressed hot air to provide homogenous charge to the cylinder to begin second stage compression in the cylinder having two variable compression ratios, a first variable compression ratio for low loads to reach a compression temperature slightly below the autoignition temperature of the homogeneous charge such that spark ignited HCCI-like combustion being emission free, a second much smaller variable compression ratio for preventing pre-ignition at high loads, then increasing the pressure at constant volume via combusting homogeneous charge in the cylinder, increasing the third volume of gas to a fourth volume (an expansion process having a chosen expansion ratio much greater than the compression ratio), decreasing the pressure to atmospheric pressure while removing heat under constant volume, and finally decreasing the volume of gas to the first volume while removing heat under constant pressure to complete a two-stroke homogeneous charge spark-ignition cycle. Also disclosed is an engine employing the two-stroke HCSI cycle. | 03-05-2009 |
| 20090308369 | Laminated Counterweight for Timing Control - A stratified two-stroke engine having a laminated counterweight is disclosed. The laminated counterweight includes a traditional counterweight portion and a laminate portion. The laminate portion has an approximately circular peripheral shape and at least one notch. In operation, the notch may be used to time the opening and closing of a mixture port or a transfer port. | 12-17-2009 |
| 20100012106 | STRATIFIED SCAVENGING TWO-CYCLE ENGINE - Provided is a laminar-scavenging two-cycle engine, which can have a higher laminar-scavenging effect than that of the laminar-scavenging two-cycle engine of the prior art and which can expect drastically excellent effects on the stabilization of combustion and on the blow-by prevention. The laminar-scavenging two-cycle engine is characterized in that a scavenging passage ( | 01-21-2010 |
| 20100059030 | Stratified Scavenging Two-Cycle Engine - A stratified scavenging two-cycle engine that has a simpler structure than conventional stratified scavenging two-cycle engines and that has an excellent blow-by prevention effect etc. In an air intake stroke, lead air passes a lead-air port ( | 03-11-2010 |
| 20100139637 | TWO-STROKE ENGINE - An object is to provide a two-stroke engine achieving effective reduction of blow-by while implementing efficient gas exchange. In a two-stroke engine | 06-10-2010 |
| 20100170485 | TWO STROKE COMBUSTION ENGINE - The invention related to a two-stroke internal combustion engine ( | 07-08-2010 |
| 20100252011 | IDLE SPEED CONTROL FOR A HANDHELD POWER TOOL - Method for controlling fuel metering in a carburetor or a low pressure injection system of an internal combustion engine when the engine is operating at idle speed, the method includes the steps of:
| 10-07-2010 |
| 20100307469 | Method for operating a two-stroke engine - A two-stroke engine ( | 12-09-2010 |
| 20120145137 | TWO-CYCLE ENGINE - An engine includes a cylinder block, and a piston slidably mounted in a cylinder, with the cylinder block being formed with an exhaust passage leading to a combustion chamber through an exhaust port, a first scavenging port opened to an inner circumferential surface of the cylinder, a first communication passage formed from the first scavenging port in a radial direction of the cylinder, and a first scavenging passage formed with an opening on a bottom surface of the first communication passage, in which a side surface on a far side from the exhaust port forming the communication passage is formed towards the far side from the exhaust port in the combustion chamber, and the opening portion of the first scavenging passage and a landing portion formed in the periphery of the opening portion are formed at a bottom portion of the communication passage. | 06-14-2012 |
| 20120152217 | TWO-STROKE ENGINE - A two-stroke engine has a cylinder with a combustion chamber which is bounded by a piston which drives a crankshaft which rotates in a crankcase. The crankcase is connected to the combustion chamber via an overflow passage in the lower dead centre region of the piston. The two stroke engine has an intake passage. A carburetor forms a section of the intake passage. The intake passage is partially divided into an air passage, which supplies combustion air into an overflow passage, and a mixture passage which opens into the crankcase. A throttle valve mounted pivotably in the carburetor controls the combustion air quantity supplied to the air and mixture passages. An air-guiding element arranged on the passage wall of the air passage guides the combustion air passing between the throttle valve and passage wall in the idling position of the throttle valve in the direction of the mixture passage. | 06-21-2012 |
| 20120152218 | TWO-STROKE ENGINE - A two-stroke engine, comprising: a crankcase; a cylinder connected to said crankcase; a combustion chamber defined by a reciprocally mounted piston within said cylinder; a crankshaft mounted rotatably in said crankcase and drivingly connected with said piston; at least one overflow passage connecting the crankcase and the combustion chamber when the piston is positioned in the lower dead center region; a connecting stub attached to said cylinder which contains an intake passage that opens into the crankcase and supplies fuel and combustion air, said intake passage including therein an air-fuel mixture passage, wherein said connecting stub contains at least one section of the mixture passage; at least one fuel opening for supplying fuel into said mixture passage; and a guiding rib positioned within said connecting stub and oriented longitudinally in the mixture passage and protruding into the mixture passage. | 06-21-2012 |
| 20120304973 | Two-Stroke Engine - An engine has a cylinder wherein a reciprocating piston is mounted. The piston drives, via a connecting rod ( | 12-06-2012 |
| 20140238371 | Two-Stroke Internal Combustion Engine - The scavenging passage includes a wall surface that defines an orientation direction of a main scavenging gas flow spouting from the scavenging port to the cylinder chamber. In a boundary portion between the scavenging port and the scavenging passage, a wall surface located on an opposite side of the exhaust port is composed of an inclined surface inclined in a direction further away from the exhaust port than a wall surface of a deep portion of the scavenging passage. The scavenging port includes a rear wall surface located in a portion on the opposite side of the exhaust port. The rear wall surface continues to the inclined surface to extend in the direction away from the exhaust port and generates an incidental scavenging gas flow incidental to the main scavenging gas flow and higher in speed than the main scavenging gas flow. | 08-28-2014 |
| 20140318518 | OPPOSED PISTON INTERNAL COMBUSTION ENGINE WITH INVISCID LAYER SEALING - An opposed-piston engine that forms an inviscid layer between pistons and the respective cylinder walls. In an aspect, the opposed-piston engine utilizes a Scotch yoke assembly that includes rigidly connected opposed combustion pistons. In an aspect, the Scotch yoke assembly is configured to transfer power from the combustion pistons to a crankshaft assembly. In an aspect, the crankshaft assembly can be configured to have dual flywheels that are internal to the engine, and can be configured to assist with an exhaust system, a detonation system, and/or a lubrication system. | 10-30-2014 |
| 20160061097 | UNIFLOW SCAVENGING 2-CYCLE ENGINE - A uniflow scavenging 2-cycle engine includes a cylinder inside which a combustion chamber is formed; a piston which slides within the cylinder; a scavenge port which is provided on one end side in a stroke direction of the piston in the cylinder to suck an active gas into the combustion chamber in accordance with the sliding movement of the piston; and a fuel injection unit which has an injection port located on the outside of the cylinder, and injects the fuel gas into the active gas sucked into the scavenge port. | 03-03-2016 |
| 20080302344 | Internal combustion engine and method of operating the same - An internal combustion engine has a cylinder ( | 12-11-2008 |
| 20100288252 | Non-Polluting Two-Stroke Engine with Air-Cooled Piston - A two-stroke internal combustion engine has at least one cylinder having a bore diameter, a central axis, a cylinder wall, and an upper and a lower extremity, a piston slip-fit in the cylinder, the piston having an overall height and a top surface, an upper portion and a lower portion each of approximately the bore diameter, each of the upper and lower portions having at least one seal ring between the piston and the cylinder wall, and a central portion of significantly less than the bore diameter and a height at least one-half of the overall piston height, providing an annular space between the central piston portion and the cylinder wall, a crank mechanism coupled to the piston in a manner providing a repeating stroke of a specific stroke length in the direction of the central axis of the cylinder, the repeating stroke providing a varying volume V between the top of the cylinder and the top surface of the piston, one or more exhaust ports through the cylinder wall, each exhaust port having a first height in the direction of the cylinder axis, centered at a first dimension from the top of the cylinder, one or more intake ports through the cylinder wall, each intake port having a second height in the direction of the cylinder axis, centered at a second dimension from the top of the cylinder, and a forced-air mechanism providing air to the one or more intake ports, wherein for a significant portion of every stroke both the one or more exhaust ports and the one or more intake ports are open to the annular space between the central piston portion and the cylinder wall, allowing the air pump to force air from the one or more intake ports around the central piston portion to the one or more exhaust ports. | 11-18-2010 |
| 20100288253 | AIR INTAKE PORTING FOR A TWO STROKE ENGINE - A two stroke engine of a particular configuration can have its power output increased by running bigger pistons and using ports in the piston skirt through which to conduct compressed air within the skirt through short passages in the cylinder housing that conduct the air from within the skirt to above the piston. As a result a larger piston can be used for the same spacing and opening size in the block to save the need to redesign the block and the crankshaft. A position adjuster for the piston moves it axially without rotation of the piston ports out of alignment with inlet ports in the housing. The piston rod is held in the crosshead using a flat to prevent rotation while an adjuster nut that is turned creates axial movement in the piston rod with a lock nut securing the final piston position. | 11-18-2010 |
| 20110017182 | TWO-STROKE INTERNAL COMBUSTION ENGINE - There is provided a loop-scavenged two-stroke internal combustion engine that is capable of effectively suppressing the short-circuiting of fresh charge (unburnt air-fuel mixture), while at the same time being capable of further improving scavenging efficiency, combustion efficiency, etc., as well as of improving the durability and output stability of a cylinder and a piston. One pair or a plurality of pairs of scavenging passages ( | 01-27-2011 |
| 20110017183 | TWO-STROKE INTERNAL COMBUSTION ENGINE - There is provided a reverse scavenged two-stroke internal combustion engine that is capable of effectively suppressing the short-circuiting of fresh charge (unburnt air-fuel mixture), while at the same time being capable of further improving scavenging efficiency, combustion efficiency, etc. The horizontal sectional shape of at least one pair of scavenging passages ( | 01-27-2011 |
| 20110079206 | TWO-STROKE ENGINE - In a two-stroke engine ( | 04-07-2011 |
| 20110146642 | Two-Stroke Engine, Sand Core for Producing a Two-Stroke Engine, and Method for Operating a Two-Stroke Engine - A two-stroke engine has a cylinder with a combustion chamber and a reciprocating piston for driving a crankshaft. Transfer passages connect the crankcase in at least one position of the piston with the combustion chamber and open by piston-controlled transfer ports into the combustion chamber. An inlet opens into the crankcase and an outlet is provided at the combustion chamber. The engine is dividable into four sectors parallel to a longitudinal cylinder axis. The transfer port of a first transfer passage is arranged in the first sector, the outlet is arranged in the second sector, the transfer port of a second transfer passage is provided in the third sector, and the inlet is arranged in the fourth sector. Within the cylinder the first and second transfer passages, at a spacing from a separation plane between cylinder and crankcase, pass together into one of the second and fourth sectors. | 06-23-2011 |
| 20110146643 | Two-Stroke Engine - A two-stroke engine has a cylinder with a combustion chamber and a piston reciprocatingly supported in the cylinder. A crankshaft is rotatably supported in a crankcase and driven by the piston. At least one transfer passage connects the crankcase in at least one position of the piston with the combustion chamber and has a piston-controlled transfer port that opens into the combustion chamber and an opening that opens into the crankcase. A mixture inlet opens into the crankcase. An outlet is provided at the combustion chamber. The transfer port and the opening are displaced relative to each other in a circumferential direction of the cylinder. At least one wall section of the transfer passage forms an undercut when viewed from the crankcase in a direction of a longitudinal cylinder axis of the cylinder and is delimited by a separate component inserted into the cylinder from a side facing the crankcase. | 06-23-2011 |
| 20110197868 | Two-stroke engine - A two-stroke engine ( | 08-18-2011 |
| 20110247601 | TWO-CYCLE ENGINE AND LOW EMISSION CONTROL SYSTEM - A two-cycle engine including exhaust, air inlet, scavenging and air/fuel intake windows disposed in the cylinder wall, a reciprocating piston driving a crankshaft, and curved gas-conveying channels connecting the crankcase chamber with the cylinder bore, the channels being opened by the reciprocating piston and the channels producing centrifugation of gases circulating therein to produce lean and rich components of an air/fuel mixture, wherein the lean component is circulated in a region of the combustion chamber remote from the exhaust window for promoting reduced combustion residues. | 10-13-2011 |
| 20110308507 | TWO-STROKE CYCLE COMBUSTION ENGINE OF AIR SCAVENGING TYPE - A two-stroke cycle combustion engine of an air scavenging type includes one or more scavenging passages ( | 12-22-2011 |
| 20120006308 | Piston for a Two-Stroke Engine - A transfer passage design for a two stroke internal combustion engine that allows for regulation of the air/fuel flow as the piston nears the bottom of its stroke. Additionally, a cut out in the skirt of the piston may allow for additional gaseous communication between the crankcase chamber and the transfer passage. | 01-12-2012 |
| 20120024276 | LOOP SCAVENGED TWO-STROKE INTERNAL COMBUSTION ENGINE - A loop scavenged two-stroke internal combustion engine which can effectively restrain blow-by of fresh gas with a relatively simple configuration is provided. A horizontal scavenging angle θb in at least one spot of a scavenging passage | 02-02-2012 |
| 20120060806 | Two-Stroke Engine - A two-stroke engine has a cylinder having a cylinder bore with a combustion chamber and an outlet connected with the combustion chamber. A piston is disposed in the cylinder and delimits the combustion chamber. The piston has a piston recess. A crankcase is provided that has a crankshaft rotatably supported therein. The piston drives in rotation the crankshaft. In at least one position of the piston, the crankcase is connected by a transfer passage with the combustion chamber. An air passage is provided as well as a mixture passage that has a mixture inlet that is disposed at the cylinder bore and opens into the cylinder bore and is piston-controlled. The transfer passage is connected by the piston recess to the air passage when the piston is at top dead center. The piston recess has a connection to the mixture inlet in at least one position of the piston. | 03-15-2012 |
| 20120247442 | STRATIFIED TWO-STROKE ENGINE - Various embodiments include two-stroke stratified engines and dual passage carburetors for use with gaseous fuel and liquid fuels. A stratified air-head engine having a simpler intake manifold with a single air pipe for induction of air is included. | 10-04-2012 |
| 20120260900 | STRATIFIED SCAVENGING TWO-CYCLE ENGINE - A laminar-scavenging two-cycle engine which has a high laminar-scavenging effect, includes a scavenging passage having a crankcase side portion extending along a crankcase, and a cylinder side portion extending along a cylinder and having a length larger than the sum of the diameter and stroke of the cylinder. An ambient air introducing passage for introducing leading air into the scavenging passage is connected to an intermediate portion of the scavenging passage. A notch for opening a scavenging port to the side of the crankcase when a piston is near the top dead center is formed in the piston. | 10-18-2012 |
| 20120325191 | SCAVENGING PASSAGE STRUCTURE FOR TWO-STROKE ENGINE - A scavenging passage structure for a two-stroke engine, having a scavenging passage communicating a scavenging port provided in a cylinder with a crank chamber formed inside a crankcase, the scavenging passage being formed to extend through respective fastening surfaces of the cylinder and the crankcase. The scavenging passage includes a cover member attached inside the crankcase to be in contact with an inner wall surface of the crankcase, and a groove formed in at least one of the inner wall surface of the crankcase contacting the cover member, and the cover member contacting the inner wall surface of the crankcase, the groove forming part of the scavenging passage connecting to the crank chamber and to an upper face of the crankcase. | 12-27-2012 |
| 20130037011 | Two-Stroke Internal Combustion Engine - It is intended to effectively prevent blow-by with no need for large changes in typical structures of two-cycle internal combustion engines. A main scavenging passage ( | 02-14-2013 |
| 20130061835 | Two-Stroke Engine and a Method for the Operation thereof - A two-stroke engine has a cylinder wherein a piston is journalled for reciprocating movement. The piston delimits a combustion chamber configured in the cylinder. The engine has an outlet from the combustion chamber and a transfer channel which opens at an inlet opening into the crankcase and at a transfer window in the combustion chamber. The piston drives a crankshaft via a connecting rod. The crankshaft is rotatably journalled in the crankcase. At least one control element for the inlet opening is connected to the crankshaft so as to rotate therewith. | 03-14-2013 |
| 20130068205 | TWO-STROKE ENGINE AND LUBRICATION - Various embodiments include a two-stroke engine and a carburetor for use with gaseous fuel, such as hydrogen, methane, liquid petroleum gas, pure propane, and butane. | 03-21-2013 |
| 20140060507 | ENGINE AND ENGINE-DRIVEN WORKING MACHINE - An engine and an engine-driven working machine which enable blow-though prevention of an uncombusted air-fuel mixture and control of the number of times of combustion, stabilize operation during idling, and ensure output and acceleration performance during working are provided. A two-cycle engine having: a piston; a crankcase in which scavenging passages are formed; and a cylinder in which scavenging ports communicated with the scavenging passages and an exhaust port for discharging a combustion gas are formed. In the two-cycle engine, at least two or more systems of the scavenging passages having mutually different opening/closing systems are formed in the crankcase. | 03-06-2014 |
| 20140182571 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A stratified scavenging two-stroke engine includes a first scavenging passage that extends from a first scavenging intake that opens to the inside of the crankcase to a first scavenging port that opens to the inside of a cylinder, and a second scavenging passage that extends from a second scavenging intake that opens to the inside of the crankcase to a second scavenging port that opens to the inside of the cylinder. The first and second passages are formed so as to communicate with each other via a communicating portion. An air passage is connected to the first passage at a position closer to the first scavenging intake than the communicating portion. A first check valve inhibits a flow from the first passage to the inside of the crankcase, and a second check valve inhibits a flow from the first passage through the air passage to the outside. | 07-03-2014 |
| 20140318517 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A stratified scavenging two-stroke engine includes: an intake passage that connects an intake opening through an outer surface of a cylinder member with an intake port opening to the inside of a cylinder, and supplies gaseous mixture of fuel and air; an exhaust passage that connects an exhaust outlet opening through the outer surface of the cylinder member with an exhaust port opening to the inside of the cylinder, and discharges combustion gas; a scavenging passage; and an air passage that connects an air inlet opening through the outer surface of the cylinder member with the scavenging passage and supplies pre-scavenging air into the scavenging passage. The intake and the air inlet are arranged at positions opposite from the exhaust port across the axis of the cylinder, and arranged side by side in a substantially circumferential direction of the cylinder or a direction substantially perpendicular to the axis of the cylinder. | 10-30-2014 |
| 20160069296 | TWO-STROKE ENGINE - A two-stroke engine has a cylinder with a combustion chamber formed therein. The combustion chamber is delimited by a piston. The cylinder has a base on which extends a partition plane whereat the cylinder is separated from a crankcase. The combustion chamber is, in at least one piston position, connected via at least one transfer channel to the crankcase interior. The transfer channel passes from the cylinder into the crankcase at at least one opening. A side wall of the transfer channel has, in the cylinder, a first region wherein the wall encloses an angle of 90° with the cylinder longitudinal axis. Between the first region and the opening as viewed in the cylinder circumferential direction is arranged a second wall region. The second region has a spacing, measured parallel to the cylinder longitudinal axis, to the partition plane. The spacing is greater than the spacing in the first region. | 03-10-2016 |
| 20160097344 | Air Leading-Type Stratified Scavenging Two-Stroke Internal-Combustion Engine - The efficiency of charging air to a scavenging channel is enhanced by generating a gas flow in a piston groove simultaneously with the piston groove coming into communication with an air port. A piston groove | 04-07-2016 |
| 20090095269 | Two-Cycle Engine - In a stratified scavenging two-cycle engine | 04-16-2009 |
| 20100037877 | TWO CYCLE ENGINE AND TWO CYCLE ENGINE TOOL - The invention provides a two cycle engine which effectively suppresses an intrusion of a combustion gas into a crank chamber. Further, the invention provides a two cycle engine tool provided with the two cycle engine mentioned above. An engine is provided with a cylinder having two scavenge air ports at different positions in a cylinder circumference direction, and scavenge air inflow ports communicating individually with these two scavenge air ports via a scavenge air passage, and a piston in which two scavenge air communication ports are formed at positions corresponding to the scavenge air inflow ports, and is structured to swirl the gas flowing into the piston from the cylinder through the scavenge air passage, in an upper portion of the internal space of the piston, and retains the gas in the upper portion of the internal space of the piston. | 02-18-2010 |
| 20110180054 | Two-Stroke Internal Combustion Engine and Its Scavenging Method - In a two-stroke internal combustion engine using air for scavenging its combustion chamber ( | 07-28-2011 |
| 20120024275 | TWO-STROKE INTERNAL COMBUSTION ENGINE - A two stroke crank case scavenged two-stroke internal combustion engine, the engine including: a cylinder ( | 02-02-2012 |
| 20130255652 | INTERNAL COMBUSTION ENGINE, IN PARTICULAR TWO-STROKE INTERNAL COMBUSTION ENGINE - To create an internal combustion engine including a crankcase and a cylinder, wherein a piston is guided in the cylinder to perform a stroke movement and movably defines a combustion chamber, and wherein at least one transfer channel, through which ignition mixture is guided from the crankcase into the combustion chamber, is arranged in the cylinder, which leads to a further improvement of the exhaust gas quality and/or of the fuel consumption, in particular for creating an improved metering of ignition mixture into the fuel chamber, it is proposed for the piston to encompass a lower piston edge, which interacts with at least one counter body such that an inlet cross section of the transfer channel for the inflow of the ignition mixture from the crankcase into the transfer channel can be controlled by the stroke movement of the piston by the lower piston edge. | 10-03-2013 |
| 20150337765 | Stratified Scavenging Two-Stroke Internal Combustion Engine And Carburetor Thereof - A carburetor achieves better emission characteristics while improving a combustion state by increasing a delivery ratio of a stratified scavenging engine and reducing intake resistance. No dividing wall is provided between a throttle valve | 11-26-2015 |
| 20150377117 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A stratified scavenging two-stroke engine includes a first scavenging passage that extends from a first scavenging intake that opens to the inside of the crankcase to a scavenging port that opens to the inside of a cylinder, and a second scavenging passage that branches from the first scavenging passage and extends to a second scavenging intake that opens to the inside of the crankcase. An air passage is provided to supply air for pre-scavenging into the first scavenging passage at a position closer to the first scavenging intake than a position at which the second scavenging passage branches from the first scavenging passage. A first check valve inhibits a flow of air from the first scavenging passage during an upward stroke of the piston, and a second check valve inhibits a flow of air and a gaseous mixture from the first scavenging passage during a downward stroke of the piston. | 12-31-2015 |
| 20160169087 | Air Leading Type Two-Stroke Engine And Intake System For Same, And Carburetor | 06-16-2016 |
| 20160376979 | Stratified Scavenging Two-Stroke Internal Combustion Engine, Air Cleaner Of The Same, And Intake Method - An amplitude of a pressure fluctuation in a vicinity of a main nozzle of a carburetor ( | 12-29-2016 |
| 20080308084 | CYLINDER/CRANKCASE GROUP FOR TWO-STROKE INTERNAL COMBUSTION ENGINES PROVIDED WITH MEANS FOR SUPERCHARGING THE ENGINE - A fuel injection system for a two-stroke internal combustion engine ( | 12-18-2008 |
| 20160252011 | TWO-CYCLE GAS ENGINE | 09-01-2016 |
| 20090283081 | AIR INTAKE PORTING FOR A TWO STROKE ENGINE - A two stroke engine of a particular configuration can have its power output increased by running bigger pistons and using ports in the piston skirt through which to conduct compressed air within the skirt through short passages in the cylinder housing that conduct the air from within the skirt to above the piston. As a result a larger piston can be used for the same spacing and opening size in the block to save the need to redesign the block and the crankshaft. A position adjuster for the piston moves it axially without rotation of the piston ports out of alignment with inlet ports in the housing. The piston rod is held in the crosshead using a flat to prevent rotation while an adjuster nut that is turned creates axial movement in the piston rod with a lock nut securing the final piston position. | 11-19-2009 |
| 20120097141 | TWO-STROKE ENGINE WITH A COMPRESSED-AIR-ASSISTED FUEL-INJECTION SYSTEM - A two-stroke internal combustion engine is provided and includes a casing, a cylinder, a piston skirt, an aspirating port, a carburetor which supplies the casing with an air/fuel mixture, through said aspirating port, a transfer conduit which opens into the cylinder through an air/fuel inlet port, and a fuel storage system, or resonance tube which communicates with a first port located above the aspirating port, and with a second port located below the aspirating port. The first port and the second port are alternatingly opened by the piston skirt, which includes a through-hole having a diameter between 0.5 and 3.0 mm. The through-hole being located, when the piston is mounted in the engine, in a same radial plane as the second port. | 04-26-2012 |
| 20120318250 | TWO-STROKE ENGINE - The two-stroke engine has a plurality of intake passages extending from the external air inlet port through the crankcase, separating the intake air charge from the air and oil vapor within the crankcase. The piston has one or more corresponding inlet tubes depending therefrom that telescope within the crankcase intake passages as the piston reciprocates. All intake air travels through these passages and is separated from the remainder of the crankcase volume. The incoming air charge passes through a concentric poppet valve in the piston crown to enter the combustion chamber. Fuel is provided by conventional direct or port injection and ignition is provided by one or more conventional spark plugs. Diesel operation is achievable when the engine is configured appropriately. Exhaust exits the combustion chamber through a poppet valve in the cylinder head, the poppet valve being actuated by a rocker arm and pushrod from a crankshaft driven cam. | 12-20-2012 |
| 20140331981 | AIR INTAKE PORTING FOR A TWO STROKE ENGINE - A two stroke engine of a particular configuration can have its power output increased by running bigger pistons and using ports in the piston skirt through which to conduct compressed air within the skirt through short passages in the cylinder housing that conduct the air from within the skirt to above the piston. As a result a larger piston can be used for the same spacing and opening size in the block to save the need to redesign the block and the crankshaft. A position adjuster for the piston moves it axially without rotation of the piston ports out of alignment with inlet ports in the housing. The piston rod is held in the crosshead using a flat to prevent rotation while an adjuster nut that is turned creates axial movement in the piston rod with a lock nut securing the final piston position. | 11-13-2014 |
| 20150345372 | ASYMMETRIC TRANSFER AND INTAKE IN TWO-STROKES - With shaped connecting rod, piston and cylinder, an advantageous asymmetric timing of the two-stroke engine is achieved, wherein the combustion chamber communicates with the crankcase through a transfer port controlled by the piston and through a respective piston port controlled by the connecting rod, with the transfer port and its respective piston port arranged “in series”, and wherein an intake port communicates with the crankcase through a piston port controlled by the connecting rod, with the intake port and its respective piston port arranged “in series”. | 12-03-2015 |
| 20090007894 | Two-Cycle Engine - A stratified scavenging two-cycle engine includes: an air passage for delivering pure air to a scavenging passage; an air valve for opening and closing the air passage; and an auxiliary air passage for delivering the pare air to the scavenging passage when the air valve is completely closed. An amount of air for air-fuel mixture sucked in a crank chamber is reduced to increase the concentration of the air-fuel mixture, and air that supplements the reduced amount of the air for air-fuel mixture is fed into the scavenging passage through the auxiliary air passage, which enables the engine to be smoothly accelerated even when being suddenly accelerated from an idling state with an appropriate concentration of the air-fuel mixture sucked in a cylinder chamber during idling. | 01-08-2009 |
| 20110162630 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A two-stroke engine is provided with a piston, a cylinder that houses the piston in a manner allowing reciprocation, a crankshaft that is connected to the piston via a connecting rod, a crankcase that houses the crankshaft in a manner allowing rotation, a mixture gas passage that introduces mixture gas into the crankcase, a scavenging passage that extends between a scavenging intake that opens into the crankcase and a scavenging port that opens into the cylinder; and an air passage that is connected to an intermediate position of the scavenging passage for introducing air into the scavenging passage. The engine is adapted such that, in a part of an upward stroke period of the piston, the crankcase in which negative pressure is generated is connected to the scavenging passage via the scavenging port. Accordingly, most of air introduced into the scavenging passage form the air passage flows toward the scavenging port and into the cylinder without changing the direction of flow. | 07-07-2011 |
| 20120097142 | PRE-COMBUSTION CYCLE PRESSURISATION SYSTEM - A two stroke internal combustion engine ( | 04-26-2012 |
| 20130092137 | FIXING DEVICE FOR TWO-STROKE ENGINE - A two-stroke engine includes a cylinder, a combustion chamber formed in a cylinder running surface, and a cylinder head and with an outlet port of the combustion chamber. A transfer port is formed in the cylinder in order to connect the interior space of a crankcase of the two-stroke engine with the combustion chamber. The cylinder includes an axial bore, at least partially penetrating a wall of the outlet port and/or of the transfer port, so that the bore at least partially forms an opening at the wall side in the outlet port and/or in the transfer port. A pin is in the bore. The pin closes the opening at the wall side in such a way that the original surface of the wall of the outlet port and/or of the transfer port is substantially restored in the area of the opening at the wall side. | 04-18-2013 |
| 20130037010 | UNIFLOW PORT-LESS TWO-STROKE ENGINE - Uniflow two-stroke engines without ports on the cylinder and with four-stroke lubrication | 02-14-2013 |
| 20140251293 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A two-stroke engine is provided with a scavenging passage that extends between a scavenging intake that opens into a crankcase and a scavenging port that opens into a cylinder, and an air passage that is connected to an intermediate position of a scavenging passage for introducing air into the scavenging passage. A first check valve that is disposed within a section of a scavenging passage between a scavenging intake and the intermediate position. A second check valve that is disposed within the air passage. The section of the scavenging passage between the intermediate position and the scavenging intake, the air passage, and a mixture gas passage are arranged in a substantially same direction with respect to a longitudinal axis of the cylinder. | 09-11-2014 |
| 123073000 | Inlet valve in head | 1 |
| 20080302345 | A Crankcase Scavenged Two-Stroke Internal Combustion Engine Having an Additional Air Supply - A crankcase scavenged two-stroke internal combustion engine ( | 12-11-2008 |
| 20090056687 | Two-stroke, homogeneous charge, spark-ignition engine - A method for combusting fuel in an engine involving decreasing a first volume of air to a third volume, in two stages, the first stage in a crankcase compressor decreasing a first volume of air to a second volume and a second stage in the engine cylinder decreasing a second volume of a gas to a third volume, injection of fuel between the two stages into partially compressed hot air to provide homogenous charge to the cylinder to begin second stage compression in the cylinder having two variable compression ratios, a first variable compression ratio for low loads to reach a compression temperature slightly below the autoignition temperature of the homogeneous charge such that spark ignited HCCI-like combustion being emission free, a second much smaller variable compression ratio for preventing pre-ignition at high loads, then increasing the pressure at constant volume via combusting homogeneous charge in the cylinder, increasing the third volume of gas to a fourth volume (an expansion process having a chosen expansion ratio much greater than the compression ratio), decreasing the pressure to atmospheric pressure while removing heat under constant volume, and finally decreasing the volume of gas to the first volume while removing heat under constant pressure to complete a two-stroke homogeneous charge spark-ignition cycle. Also disclosed is an engine employing the two-stroke HCSI cycle. | 03-05-2009 |
| 20090308369 | Laminated Counterweight for Timing Control - A stratified two-stroke engine having a laminated counterweight is disclosed. The laminated counterweight includes a traditional counterweight portion and a laminate portion. The laminate portion has an approximately circular peripheral shape and at least one notch. In operation, the notch may be used to time the opening and closing of a mixture port or a transfer port. | 12-17-2009 |
| 20100012106 | STRATIFIED SCAVENGING TWO-CYCLE ENGINE - Provided is a laminar-scavenging two-cycle engine, which can have a higher laminar-scavenging effect than that of the laminar-scavenging two-cycle engine of the prior art and which can expect drastically excellent effects on the stabilization of combustion and on the blow-by prevention. The laminar-scavenging two-cycle engine is characterized in that a scavenging passage ( | 01-21-2010 |
| 20100059030 | Stratified Scavenging Two-Cycle Engine - A stratified scavenging two-cycle engine that has a simpler structure than conventional stratified scavenging two-cycle engines and that has an excellent blow-by prevention effect etc. In an air intake stroke, lead air passes a lead-air port ( | 03-11-2010 |
| 20100139637 | TWO-STROKE ENGINE - An object is to provide a two-stroke engine achieving effective reduction of blow-by while implementing efficient gas exchange. In a two-stroke engine | 06-10-2010 |
| 20100170485 | TWO STROKE COMBUSTION ENGINE - The invention related to a two-stroke internal combustion engine ( | 07-08-2010 |
| 20100252011 | IDLE SPEED CONTROL FOR A HANDHELD POWER TOOL - Method for controlling fuel metering in a carburetor or a low pressure injection system of an internal combustion engine when the engine is operating at idle speed, the method includes the steps of:
| 10-07-2010 |
| 20100307469 | Method for operating a two-stroke engine - A two-stroke engine ( | 12-09-2010 |
| 20120145137 | TWO-CYCLE ENGINE - An engine includes a cylinder block, and a piston slidably mounted in a cylinder, with the cylinder block being formed with an exhaust passage leading to a combustion chamber through an exhaust port, a first scavenging port opened to an inner circumferential surface of the cylinder, a first communication passage formed from the first scavenging port in a radial direction of the cylinder, and a first scavenging passage formed with an opening on a bottom surface of the first communication passage, in which a side surface on a far side from the exhaust port forming the communication passage is formed towards the far side from the exhaust port in the combustion chamber, and the opening portion of the first scavenging passage and a landing portion formed in the periphery of the opening portion are formed at a bottom portion of the communication passage. | 06-14-2012 |
| 20120152217 | TWO-STROKE ENGINE - A two-stroke engine has a cylinder with a combustion chamber which is bounded by a piston which drives a crankshaft which rotates in a crankcase. The crankcase is connected to the combustion chamber via an overflow passage in the lower dead centre region of the piston. The two stroke engine has an intake passage. A carburetor forms a section of the intake passage. The intake passage is partially divided into an air passage, which supplies combustion air into an overflow passage, and a mixture passage which opens into the crankcase. A throttle valve mounted pivotably in the carburetor controls the combustion air quantity supplied to the air and mixture passages. An air-guiding element arranged on the passage wall of the air passage guides the combustion air passing between the throttle valve and passage wall in the idling position of the throttle valve in the direction of the mixture passage. | 06-21-2012 |
| 20120152218 | TWO-STROKE ENGINE - A two-stroke engine, comprising: a crankcase; a cylinder connected to said crankcase; a combustion chamber defined by a reciprocally mounted piston within said cylinder; a crankshaft mounted rotatably in said crankcase and drivingly connected with said piston; at least one overflow passage connecting the crankcase and the combustion chamber when the piston is positioned in the lower dead center region; a connecting stub attached to said cylinder which contains an intake passage that opens into the crankcase and supplies fuel and combustion air, said intake passage including therein an air-fuel mixture passage, wherein said connecting stub contains at least one section of the mixture passage; at least one fuel opening for supplying fuel into said mixture passage; and a guiding rib positioned within said connecting stub and oriented longitudinally in the mixture passage and protruding into the mixture passage. | 06-21-2012 |
| 20120304973 | Two-Stroke Engine - An engine has a cylinder wherein a reciprocating piston is mounted. The piston drives, via a connecting rod ( | 12-06-2012 |
| 20140238371 | Two-Stroke Internal Combustion Engine - The scavenging passage includes a wall surface that defines an orientation direction of a main scavenging gas flow spouting from the scavenging port to the cylinder chamber. In a boundary portion between the scavenging port and the scavenging passage, a wall surface located on an opposite side of the exhaust port is composed of an inclined surface inclined in a direction further away from the exhaust port than a wall surface of a deep portion of the scavenging passage. The scavenging port includes a rear wall surface located in a portion on the opposite side of the exhaust port. The rear wall surface continues to the inclined surface to extend in the direction away from the exhaust port and generates an incidental scavenging gas flow incidental to the main scavenging gas flow and higher in speed than the main scavenging gas flow. | 08-28-2014 |
| 20140318518 | OPPOSED PISTON INTERNAL COMBUSTION ENGINE WITH INVISCID LAYER SEALING - An opposed-piston engine that forms an inviscid layer between pistons and the respective cylinder walls. In an aspect, the opposed-piston engine utilizes a Scotch yoke assembly that includes rigidly connected opposed combustion pistons. In an aspect, the Scotch yoke assembly is configured to transfer power from the combustion pistons to a crankshaft assembly. In an aspect, the crankshaft assembly can be configured to have dual flywheels that are internal to the engine, and can be configured to assist with an exhaust system, a detonation system, and/or a lubrication system. | 10-30-2014 |
| 20160061097 | UNIFLOW SCAVENGING 2-CYCLE ENGINE - A uniflow scavenging 2-cycle engine includes a cylinder inside which a combustion chamber is formed; a piston which slides within the cylinder; a scavenge port which is provided on one end side in a stroke direction of the piston in the cylinder to suck an active gas into the combustion chamber in accordance with the sliding movement of the piston; and a fuel injection unit which has an injection port located on the outside of the cylinder, and injects the fuel gas into the active gas sucked into the scavenge port. | 03-03-2016 |
| 20080302344 | Internal combustion engine and method of operating the same - An internal combustion engine has a cylinder ( | 12-11-2008 |
| 20100288252 | Non-Polluting Two-Stroke Engine with Air-Cooled Piston - A two-stroke internal combustion engine has at least one cylinder having a bore diameter, a central axis, a cylinder wall, and an upper and a lower extremity, a piston slip-fit in the cylinder, the piston having an overall height and a top surface, an upper portion and a lower portion each of approximately the bore diameter, each of the upper and lower portions having at least one seal ring between the piston and the cylinder wall, and a central portion of significantly less than the bore diameter and a height at least one-half of the overall piston height, providing an annular space between the central piston portion and the cylinder wall, a crank mechanism coupled to the piston in a manner providing a repeating stroke of a specific stroke length in the direction of the central axis of the cylinder, the repeating stroke providing a varying volume V between the top of the cylinder and the top surface of the piston, one or more exhaust ports through the cylinder wall, each exhaust port having a first height in the direction of the cylinder axis, centered at a first dimension from the top of the cylinder, one or more intake ports through the cylinder wall, each intake port having a second height in the direction of the cylinder axis, centered at a second dimension from the top of the cylinder, and a forced-air mechanism providing air to the one or more intake ports, wherein for a significant portion of every stroke both the one or more exhaust ports and the one or more intake ports are open to the annular space between the central piston portion and the cylinder wall, allowing the air pump to force air from the one or more intake ports around the central piston portion to the one or more exhaust ports. | 11-18-2010 |
| 20100288253 | AIR INTAKE PORTING FOR A TWO STROKE ENGINE - A two stroke engine of a particular configuration can have its power output increased by running bigger pistons and using ports in the piston skirt through which to conduct compressed air within the skirt through short passages in the cylinder housing that conduct the air from within the skirt to above the piston. As a result a larger piston can be used for the same spacing and opening size in the block to save the need to redesign the block and the crankshaft. A position adjuster for the piston moves it axially without rotation of the piston ports out of alignment with inlet ports in the housing. The piston rod is held in the crosshead using a flat to prevent rotation while an adjuster nut that is turned creates axial movement in the piston rod with a lock nut securing the final piston position. | 11-18-2010 |
| 20110017182 | TWO-STROKE INTERNAL COMBUSTION ENGINE - There is provided a loop-scavenged two-stroke internal combustion engine that is capable of effectively suppressing the short-circuiting of fresh charge (unburnt air-fuel mixture), while at the same time being capable of further improving scavenging efficiency, combustion efficiency, etc., as well as of improving the durability and output stability of a cylinder and a piston. One pair or a plurality of pairs of scavenging passages ( | 01-27-2011 |
| 20110017183 | TWO-STROKE INTERNAL COMBUSTION ENGINE - There is provided a reverse scavenged two-stroke internal combustion engine that is capable of effectively suppressing the short-circuiting of fresh charge (unburnt air-fuel mixture), while at the same time being capable of further improving scavenging efficiency, combustion efficiency, etc. The horizontal sectional shape of at least one pair of scavenging passages ( | 01-27-2011 |
| 20110079206 | TWO-STROKE ENGINE - In a two-stroke engine ( | 04-07-2011 |
| 20110146642 | Two-Stroke Engine, Sand Core for Producing a Two-Stroke Engine, and Method for Operating a Two-Stroke Engine - A two-stroke engine has a cylinder with a combustion chamber and a reciprocating piston for driving a crankshaft. Transfer passages connect the crankcase in at least one position of the piston with the combustion chamber and open by piston-controlled transfer ports into the combustion chamber. An inlet opens into the crankcase and an outlet is provided at the combustion chamber. The engine is dividable into four sectors parallel to a longitudinal cylinder axis. The transfer port of a first transfer passage is arranged in the first sector, the outlet is arranged in the second sector, the transfer port of a second transfer passage is provided in the third sector, and the inlet is arranged in the fourth sector. Within the cylinder the first and second transfer passages, at a spacing from a separation plane between cylinder and crankcase, pass together into one of the second and fourth sectors. | 06-23-2011 |
| 20110146643 | Two-Stroke Engine - A two-stroke engine has a cylinder with a combustion chamber and a piston reciprocatingly supported in the cylinder. A crankshaft is rotatably supported in a crankcase and driven by the piston. At least one transfer passage connects the crankcase in at least one position of the piston with the combustion chamber and has a piston-controlled transfer port that opens into the combustion chamber and an opening that opens into the crankcase. A mixture inlet opens into the crankcase. An outlet is provided at the combustion chamber. The transfer port and the opening are displaced relative to each other in a circumferential direction of the cylinder. At least one wall section of the transfer passage forms an undercut when viewed from the crankcase in a direction of a longitudinal cylinder axis of the cylinder and is delimited by a separate component inserted into the cylinder from a side facing the crankcase. | 06-23-2011 |
| 20110197868 | Two-stroke engine - A two-stroke engine ( | 08-18-2011 |
| 20110247601 | TWO-CYCLE ENGINE AND LOW EMISSION CONTROL SYSTEM - A two-cycle engine including exhaust, air inlet, scavenging and air/fuel intake windows disposed in the cylinder wall, a reciprocating piston driving a crankshaft, and curved gas-conveying channels connecting the crankcase chamber with the cylinder bore, the channels being opened by the reciprocating piston and the channels producing centrifugation of gases circulating therein to produce lean and rich components of an air/fuel mixture, wherein the lean component is circulated in a region of the combustion chamber remote from the exhaust window for promoting reduced combustion residues. | 10-13-2011 |
| 20110308507 | TWO-STROKE CYCLE COMBUSTION ENGINE OF AIR SCAVENGING TYPE - A two-stroke cycle combustion engine of an air scavenging type includes one or more scavenging passages ( | 12-22-2011 |
| 20120006308 | Piston for a Two-Stroke Engine - A transfer passage design for a two stroke internal combustion engine that allows for regulation of the air/fuel flow as the piston nears the bottom of its stroke. Additionally, a cut out in the skirt of the piston may allow for additional gaseous communication between the crankcase chamber and the transfer passage. | 01-12-2012 |
| 20120024276 | LOOP SCAVENGED TWO-STROKE INTERNAL COMBUSTION ENGINE - A loop scavenged two-stroke internal combustion engine which can effectively restrain blow-by of fresh gas with a relatively simple configuration is provided. A horizontal scavenging angle θb in at least one spot of a scavenging passage | 02-02-2012 |
| 20120060806 | Two-Stroke Engine - A two-stroke engine has a cylinder having a cylinder bore with a combustion chamber and an outlet connected with the combustion chamber. A piston is disposed in the cylinder and delimits the combustion chamber. The piston has a piston recess. A crankcase is provided that has a crankshaft rotatably supported therein. The piston drives in rotation the crankshaft. In at least one position of the piston, the crankcase is connected by a transfer passage with the combustion chamber. An air passage is provided as well as a mixture passage that has a mixture inlet that is disposed at the cylinder bore and opens into the cylinder bore and is piston-controlled. The transfer passage is connected by the piston recess to the air passage when the piston is at top dead center. The piston recess has a connection to the mixture inlet in at least one position of the piston. | 03-15-2012 |
| 20120247442 | STRATIFIED TWO-STROKE ENGINE - Various embodiments include two-stroke stratified engines and dual passage carburetors for use with gaseous fuel and liquid fuels. A stratified air-head engine having a simpler intake manifold with a single air pipe for induction of air is included. | 10-04-2012 |
| 20120260900 | STRATIFIED SCAVENGING TWO-CYCLE ENGINE - A laminar-scavenging two-cycle engine which has a high laminar-scavenging effect, includes a scavenging passage having a crankcase side portion extending along a crankcase, and a cylinder side portion extending along a cylinder and having a length larger than the sum of the diameter and stroke of the cylinder. An ambient air introducing passage for introducing leading air into the scavenging passage is connected to an intermediate portion of the scavenging passage. A notch for opening a scavenging port to the side of the crankcase when a piston is near the top dead center is formed in the piston. | 10-18-2012 |
| 20120325191 | SCAVENGING PASSAGE STRUCTURE FOR TWO-STROKE ENGINE - A scavenging passage structure for a two-stroke engine, having a scavenging passage communicating a scavenging port provided in a cylinder with a crank chamber formed inside a crankcase, the scavenging passage being formed to extend through respective fastening surfaces of the cylinder and the crankcase. The scavenging passage includes a cover member attached inside the crankcase to be in contact with an inner wall surface of the crankcase, and a groove formed in at least one of the inner wall surface of the crankcase contacting the cover member, and the cover member contacting the inner wall surface of the crankcase, the groove forming part of the scavenging passage connecting to the crank chamber and to an upper face of the crankcase. | 12-27-2012 |
| 20130037011 | Two-Stroke Internal Combustion Engine - It is intended to effectively prevent blow-by with no need for large changes in typical structures of two-cycle internal combustion engines. A main scavenging passage ( | 02-14-2013 |
| 20130061835 | Two-Stroke Engine and a Method for the Operation thereof - A two-stroke engine has a cylinder wherein a piston is journalled for reciprocating movement. The piston delimits a combustion chamber configured in the cylinder. The engine has an outlet from the combustion chamber and a transfer channel which opens at an inlet opening into the crankcase and at a transfer window in the combustion chamber. The piston drives a crankshaft via a connecting rod. The crankshaft is rotatably journalled in the crankcase. At least one control element for the inlet opening is connected to the crankshaft so as to rotate therewith. | 03-14-2013 |
| 20130068205 | TWO-STROKE ENGINE AND LUBRICATION - Various embodiments include a two-stroke engine and a carburetor for use with gaseous fuel, such as hydrogen, methane, liquid petroleum gas, pure propane, and butane. | 03-21-2013 |
| 20140060507 | ENGINE AND ENGINE-DRIVEN WORKING MACHINE - An engine and an engine-driven working machine which enable blow-though prevention of an uncombusted air-fuel mixture and control of the number of times of combustion, stabilize operation during idling, and ensure output and acceleration performance during working are provided. A two-cycle engine having: a piston; a crankcase in which scavenging passages are formed; and a cylinder in which scavenging ports communicated with the scavenging passages and an exhaust port for discharging a combustion gas are formed. In the two-cycle engine, at least two or more systems of the scavenging passages having mutually different opening/closing systems are formed in the crankcase. | 03-06-2014 |
| 20140182571 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A stratified scavenging two-stroke engine includes a first scavenging passage that extends from a first scavenging intake that opens to the inside of the crankcase to a first scavenging port that opens to the inside of a cylinder, and a second scavenging passage that extends from a second scavenging intake that opens to the inside of the crankcase to a second scavenging port that opens to the inside of the cylinder. The first and second passages are formed so as to communicate with each other via a communicating portion. An air passage is connected to the first passage at a position closer to the first scavenging intake than the communicating portion. A first check valve inhibits a flow from the first passage to the inside of the crankcase, and a second check valve inhibits a flow from the first passage through the air passage to the outside. | 07-03-2014 |
| 20140318517 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A stratified scavenging two-stroke engine includes: an intake passage that connects an intake opening through an outer surface of a cylinder member with an intake port opening to the inside of a cylinder, and supplies gaseous mixture of fuel and air; an exhaust passage that connects an exhaust outlet opening through the outer surface of the cylinder member with an exhaust port opening to the inside of the cylinder, and discharges combustion gas; a scavenging passage; and an air passage that connects an air inlet opening through the outer surface of the cylinder member with the scavenging passage and supplies pre-scavenging air into the scavenging passage. The intake and the air inlet are arranged at positions opposite from the exhaust port across the axis of the cylinder, and arranged side by side in a substantially circumferential direction of the cylinder or a direction substantially perpendicular to the axis of the cylinder. | 10-30-2014 |
| 20160069296 | TWO-STROKE ENGINE - A two-stroke engine has a cylinder with a combustion chamber formed therein. The combustion chamber is delimited by a piston. The cylinder has a base on which extends a partition plane whereat the cylinder is separated from a crankcase. The combustion chamber is, in at least one piston position, connected via at least one transfer channel to the crankcase interior. The transfer channel passes from the cylinder into the crankcase at at least one opening. A side wall of the transfer channel has, in the cylinder, a first region wherein the wall encloses an angle of 90° with the cylinder longitudinal axis. Between the first region and the opening as viewed in the cylinder circumferential direction is arranged a second wall region. The second region has a spacing, measured parallel to the cylinder longitudinal axis, to the partition plane. The spacing is greater than the spacing in the first region. | 03-10-2016 |
| 20160097344 | Air Leading-Type Stratified Scavenging Two-Stroke Internal-Combustion Engine - The efficiency of charging air to a scavenging channel is enhanced by generating a gas flow in a piston groove simultaneously with the piston groove coming into communication with an air port. A piston groove | 04-07-2016 |
| 20090095269 | Two-Cycle Engine - In a stratified scavenging two-cycle engine | 04-16-2009 |
| 20100037877 | TWO CYCLE ENGINE AND TWO CYCLE ENGINE TOOL - The invention provides a two cycle engine which effectively suppresses an intrusion of a combustion gas into a crank chamber. Further, the invention provides a two cycle engine tool provided with the two cycle engine mentioned above. An engine is provided with a cylinder having two scavenge air ports at different positions in a cylinder circumference direction, and scavenge air inflow ports communicating individually with these two scavenge air ports via a scavenge air passage, and a piston in which two scavenge air communication ports are formed at positions corresponding to the scavenge air inflow ports, and is structured to swirl the gas flowing into the piston from the cylinder through the scavenge air passage, in an upper portion of the internal space of the piston, and retains the gas in the upper portion of the internal space of the piston. | 02-18-2010 |
| 20110180054 | Two-Stroke Internal Combustion Engine and Its Scavenging Method - In a two-stroke internal combustion engine using air for scavenging its combustion chamber ( | 07-28-2011 |
| 20120024275 | TWO-STROKE INTERNAL COMBUSTION ENGINE - A two stroke crank case scavenged two-stroke internal combustion engine, the engine including: a cylinder ( | 02-02-2012 |
| 20130255652 | INTERNAL COMBUSTION ENGINE, IN PARTICULAR TWO-STROKE INTERNAL COMBUSTION ENGINE - To create an internal combustion engine including a crankcase and a cylinder, wherein a piston is guided in the cylinder to perform a stroke movement and movably defines a combustion chamber, and wherein at least one transfer channel, through which ignition mixture is guided from the crankcase into the combustion chamber, is arranged in the cylinder, which leads to a further improvement of the exhaust gas quality and/or of the fuel consumption, in particular for creating an improved metering of ignition mixture into the fuel chamber, it is proposed for the piston to encompass a lower piston edge, which interacts with at least one counter body such that an inlet cross section of the transfer channel for the inflow of the ignition mixture from the crankcase into the transfer channel can be controlled by the stroke movement of the piston by the lower piston edge. | 10-03-2013 |
| 20150337765 | Stratified Scavenging Two-Stroke Internal Combustion Engine And Carburetor Thereof - A carburetor achieves better emission characteristics while improving a combustion state by increasing a delivery ratio of a stratified scavenging engine and reducing intake resistance. No dividing wall is provided between a throttle valve | 11-26-2015 |
| 20150377117 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A stratified scavenging two-stroke engine includes a first scavenging passage that extends from a first scavenging intake that opens to the inside of the crankcase to a scavenging port that opens to the inside of a cylinder, and a second scavenging passage that branches from the first scavenging passage and extends to a second scavenging intake that opens to the inside of the crankcase. An air passage is provided to supply air for pre-scavenging into the first scavenging passage at a position closer to the first scavenging intake than a position at which the second scavenging passage branches from the first scavenging passage. A first check valve inhibits a flow of air from the first scavenging passage during an upward stroke of the piston, and a second check valve inhibits a flow of air and a gaseous mixture from the first scavenging passage during a downward stroke of the piston. | 12-31-2015 |
| 20160169087 | Air Leading Type Two-Stroke Engine And Intake System For Same, And Carburetor | 06-16-2016 |
| 20160376979 | Stratified Scavenging Two-Stroke Internal Combustion Engine, Air Cleaner Of The Same, And Intake Method - An amplitude of a pressure fluctuation in a vicinity of a main nozzle of a carburetor ( | 12-29-2016 |
| 20080308084 | CYLINDER/CRANKCASE GROUP FOR TWO-STROKE INTERNAL COMBUSTION ENGINES PROVIDED WITH MEANS FOR SUPERCHARGING THE ENGINE - A fuel injection system for a two-stroke internal combustion engine ( | 12-18-2008 |
| 20160252011 | TWO-CYCLE GAS ENGINE | 09-01-2016 |
| 20090283081 | AIR INTAKE PORTING FOR A TWO STROKE ENGINE - A two stroke engine of a particular configuration can have its power output increased by running bigger pistons and using ports in the piston skirt through which to conduct compressed air within the skirt through short passages in the cylinder housing that conduct the air from within the skirt to above the piston. As a result a larger piston can be used for the same spacing and opening size in the block to save the need to redesign the block and the crankshaft. A position adjuster for the piston moves it axially without rotation of the piston ports out of alignment with inlet ports in the housing. The piston rod is held in the crosshead using a flat to prevent rotation while an adjuster nut that is turned creates axial movement in the piston rod with a lock nut securing the final piston position. | 11-19-2009 |
| 20120097141 | TWO-STROKE ENGINE WITH A COMPRESSED-AIR-ASSISTED FUEL-INJECTION SYSTEM - A two-stroke internal combustion engine is provided and includes a casing, a cylinder, a piston skirt, an aspirating port, a carburetor which supplies the casing with an air/fuel mixture, through said aspirating port, a transfer conduit which opens into the cylinder through an air/fuel inlet port, and a fuel storage system, or resonance tube which communicates with a first port located above the aspirating port, and with a second port located below the aspirating port. The first port and the second port are alternatingly opened by the piston skirt, which includes a through-hole having a diameter between 0.5 and 3.0 mm. The through-hole being located, when the piston is mounted in the engine, in a same radial plane as the second port. | 04-26-2012 |
| 20120318250 | TWO-STROKE ENGINE - The two-stroke engine has a plurality of intake passages extending from the external air inlet port through the crankcase, separating the intake air charge from the air and oil vapor within the crankcase. The piston has one or more corresponding inlet tubes depending therefrom that telescope within the crankcase intake passages as the piston reciprocates. All intake air travels through these passages and is separated from the remainder of the crankcase volume. The incoming air charge passes through a concentric poppet valve in the piston crown to enter the combustion chamber. Fuel is provided by conventional direct or port injection and ignition is provided by one or more conventional spark plugs. Diesel operation is achievable when the engine is configured appropriately. Exhaust exits the combustion chamber through a poppet valve in the cylinder head, the poppet valve being actuated by a rocker arm and pushrod from a crankshaft driven cam. | 12-20-2012 |
| 20140331981 | AIR INTAKE PORTING FOR A TWO STROKE ENGINE - A two stroke engine of a particular configuration can have its power output increased by running bigger pistons and using ports in the piston skirt through which to conduct compressed air within the skirt through short passages in the cylinder housing that conduct the air from within the skirt to above the piston. As a result a larger piston can be used for the same spacing and opening size in the block to save the need to redesign the block and the crankshaft. A position adjuster for the piston moves it axially without rotation of the piston ports out of alignment with inlet ports in the housing. The piston rod is held in the crosshead using a flat to prevent rotation while an adjuster nut that is turned creates axial movement in the piston rod with a lock nut securing the final piston position. | 11-13-2014 |
| 20150345372 | ASYMMETRIC TRANSFER AND INTAKE IN TWO-STROKES - With shaped connecting rod, piston and cylinder, an advantageous asymmetric timing of the two-stroke engine is achieved, wherein the combustion chamber communicates with the crankcase through a transfer port controlled by the piston and through a respective piston port controlled by the connecting rod, with the transfer port and its respective piston port arranged “in series”, and wherein an intake port communicates with the crankcase through a piston port controlled by the connecting rod, with the intake port and its respective piston port arranged “in series”. | 12-03-2015 |
| 20090007894 | Two-Cycle Engine - A stratified scavenging two-cycle engine includes: an air passage for delivering pure air to a scavenging passage; an air valve for opening and closing the air passage; and an auxiliary air passage for delivering the pare air to the scavenging passage when the air valve is completely closed. An amount of air for air-fuel mixture sucked in a crank chamber is reduced to increase the concentration of the air-fuel mixture, and air that supplements the reduced amount of the air for air-fuel mixture is fed into the scavenging passage through the auxiliary air passage, which enables the engine to be smoothly accelerated even when being suddenly accelerated from an idling state with an appropriate concentration of the air-fuel mixture sucked in a cylinder chamber during idling. | 01-08-2009 |
| 20110162630 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A two-stroke engine is provided with a piston, a cylinder that houses the piston in a manner allowing reciprocation, a crankshaft that is connected to the piston via a connecting rod, a crankcase that houses the crankshaft in a manner allowing rotation, a mixture gas passage that introduces mixture gas into the crankcase, a scavenging passage that extends between a scavenging intake that opens into the crankcase and a scavenging port that opens into the cylinder; and an air passage that is connected to an intermediate position of the scavenging passage for introducing air into the scavenging passage. The engine is adapted such that, in a part of an upward stroke period of the piston, the crankcase in which negative pressure is generated is connected to the scavenging passage via the scavenging port. Accordingly, most of air introduced into the scavenging passage form the air passage flows toward the scavenging port and into the cylinder without changing the direction of flow. | 07-07-2011 |
| 20120097142 | PRE-COMBUSTION CYCLE PRESSURISATION SYSTEM - A two stroke internal combustion engine ( | 04-26-2012 |
| 20130092137 | FIXING DEVICE FOR TWO-STROKE ENGINE - A two-stroke engine includes a cylinder, a combustion chamber formed in a cylinder running surface, and a cylinder head and with an outlet port of the combustion chamber. A transfer port is formed in the cylinder in order to connect the interior space of a crankcase of the two-stroke engine with the combustion chamber. The cylinder includes an axial bore, at least partially penetrating a wall of the outlet port and/or of the transfer port, so that the bore at least partially forms an opening at the wall side in the outlet port and/or in the transfer port. A pin is in the bore. The pin closes the opening at the wall side in such a way that the original surface of the wall of the outlet port and/or of the transfer port is substantially restored in the area of the opening at the wall side. | 04-18-2013 |
| 20130037010 | UNIFLOW PORT-LESS TWO-STROKE ENGINE - Uniflow two-stroke engines without ports on the cylinder and with four-stroke lubrication | 02-14-2013 |
| 20140251293 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A two-stroke engine is provided with a scavenging passage that extends between a scavenging intake that opens into a crankcase and a scavenging port that opens into a cylinder, and an air passage that is connected to an intermediate position of a scavenging passage for introducing air into the scavenging passage. A first check valve that is disposed within a section of a scavenging passage between a scavenging intake and the intermediate position. A second check valve that is disposed within the air passage. The section of the scavenging passage between the intermediate position and the scavenging intake, the air passage, and a mixture gas passage are arranged in a substantially same direction with respect to a longitudinal axis of the cylinder. | 09-11-2014 |
| 123073000 | Fuel to cylinder | 1 |
| 20080302345 | A Crankcase Scavenged Two-Stroke Internal Combustion Engine Having an Additional Air Supply - A crankcase scavenged two-stroke internal combustion engine ( | 12-11-2008 |
| 20090056687 | Two-stroke, homogeneous charge, spark-ignition engine - A method for combusting fuel in an engine involving decreasing a first volume of air to a third volume, in two stages, the first stage in a crankcase compressor decreasing a first volume of air to a second volume and a second stage in the engine cylinder decreasing a second volume of a gas to a third volume, injection of fuel between the two stages into partially compressed hot air to provide homogenous charge to the cylinder to begin second stage compression in the cylinder having two variable compression ratios, a first variable compression ratio for low loads to reach a compression temperature slightly below the autoignition temperature of the homogeneous charge such that spark ignited HCCI-like combustion being emission free, a second much smaller variable compression ratio for preventing pre-ignition at high loads, then increasing the pressure at constant volume via combusting homogeneous charge in the cylinder, increasing the third volume of gas to a fourth volume (an expansion process having a chosen expansion ratio much greater than the compression ratio), decreasing the pressure to atmospheric pressure while removing heat under constant volume, and finally decreasing the volume of gas to the first volume while removing heat under constant pressure to complete a two-stroke homogeneous charge spark-ignition cycle. Also disclosed is an engine employing the two-stroke HCSI cycle. | 03-05-2009 |
| 20090308369 | Laminated Counterweight for Timing Control - A stratified two-stroke engine having a laminated counterweight is disclosed. The laminated counterweight includes a traditional counterweight portion and a laminate portion. The laminate portion has an approximately circular peripheral shape and at least one notch. In operation, the notch may be used to time the opening and closing of a mixture port or a transfer port. | 12-17-2009 |
| 20100012106 | STRATIFIED SCAVENGING TWO-CYCLE ENGINE - Provided is a laminar-scavenging two-cycle engine, which can have a higher laminar-scavenging effect than that of the laminar-scavenging two-cycle engine of the prior art and which can expect drastically excellent effects on the stabilization of combustion and on the blow-by prevention. The laminar-scavenging two-cycle engine is characterized in that a scavenging passage ( | 01-21-2010 |
| 20100059030 | Stratified Scavenging Two-Cycle Engine - A stratified scavenging two-cycle engine that has a simpler structure than conventional stratified scavenging two-cycle engines and that has an excellent blow-by prevention effect etc. In an air intake stroke, lead air passes a lead-air port ( | 03-11-2010 |
| 20100139637 | TWO-STROKE ENGINE - An object is to provide a two-stroke engine achieving effective reduction of blow-by while implementing efficient gas exchange. In a two-stroke engine | 06-10-2010 |
| 20100170485 | TWO STROKE COMBUSTION ENGINE - The invention related to a two-stroke internal combustion engine ( | 07-08-2010 |
| 20100252011 | IDLE SPEED CONTROL FOR A HANDHELD POWER TOOL - Method for controlling fuel metering in a carburetor or a low pressure injection system of an internal combustion engine when the engine is operating at idle speed, the method includes the steps of:
| 10-07-2010 |
| 20100307469 | Method for operating a two-stroke engine - A two-stroke engine ( | 12-09-2010 |
| 20120145137 | TWO-CYCLE ENGINE - An engine includes a cylinder block, and a piston slidably mounted in a cylinder, with the cylinder block being formed with an exhaust passage leading to a combustion chamber through an exhaust port, a first scavenging port opened to an inner circumferential surface of the cylinder, a first communication passage formed from the first scavenging port in a radial direction of the cylinder, and a first scavenging passage formed with an opening on a bottom surface of the first communication passage, in which a side surface on a far side from the exhaust port forming the communication passage is formed towards the far side from the exhaust port in the combustion chamber, and the opening portion of the first scavenging passage and a landing portion formed in the periphery of the opening portion are formed at a bottom portion of the communication passage. | 06-14-2012 |
| 20120152217 | TWO-STROKE ENGINE - A two-stroke engine has a cylinder with a combustion chamber which is bounded by a piston which drives a crankshaft which rotates in a crankcase. The crankcase is connected to the combustion chamber via an overflow passage in the lower dead centre region of the piston. The two stroke engine has an intake passage. A carburetor forms a section of the intake passage. The intake passage is partially divided into an air passage, which supplies combustion air into an overflow passage, and a mixture passage which opens into the crankcase. A throttle valve mounted pivotably in the carburetor controls the combustion air quantity supplied to the air and mixture passages. An air-guiding element arranged on the passage wall of the air passage guides the combustion air passing between the throttle valve and passage wall in the idling position of the throttle valve in the direction of the mixture passage. | 06-21-2012 |
| 20120152218 | TWO-STROKE ENGINE - A two-stroke engine, comprising: a crankcase; a cylinder connected to said crankcase; a combustion chamber defined by a reciprocally mounted piston within said cylinder; a crankshaft mounted rotatably in said crankcase and drivingly connected with said piston; at least one overflow passage connecting the crankcase and the combustion chamber when the piston is positioned in the lower dead center region; a connecting stub attached to said cylinder which contains an intake passage that opens into the crankcase and supplies fuel and combustion air, said intake passage including therein an air-fuel mixture passage, wherein said connecting stub contains at least one section of the mixture passage; at least one fuel opening for supplying fuel into said mixture passage; and a guiding rib positioned within said connecting stub and oriented longitudinally in the mixture passage and protruding into the mixture passage. | 06-21-2012 |
| 20120304973 | Two-Stroke Engine - An engine has a cylinder wherein a reciprocating piston is mounted. The piston drives, via a connecting rod ( | 12-06-2012 |
| 20140238371 | Two-Stroke Internal Combustion Engine - The scavenging passage includes a wall surface that defines an orientation direction of a main scavenging gas flow spouting from the scavenging port to the cylinder chamber. In a boundary portion between the scavenging port and the scavenging passage, a wall surface located on an opposite side of the exhaust port is composed of an inclined surface inclined in a direction further away from the exhaust port than a wall surface of a deep portion of the scavenging passage. The scavenging port includes a rear wall surface located in a portion on the opposite side of the exhaust port. The rear wall surface continues to the inclined surface to extend in the direction away from the exhaust port and generates an incidental scavenging gas flow incidental to the main scavenging gas flow and higher in speed than the main scavenging gas flow. | 08-28-2014 |
| 20140318518 | OPPOSED PISTON INTERNAL COMBUSTION ENGINE WITH INVISCID LAYER SEALING - An opposed-piston engine that forms an inviscid layer between pistons and the respective cylinder walls. In an aspect, the opposed-piston engine utilizes a Scotch yoke assembly that includes rigidly connected opposed combustion pistons. In an aspect, the Scotch yoke assembly is configured to transfer power from the combustion pistons to a crankshaft assembly. In an aspect, the crankshaft assembly can be configured to have dual flywheels that are internal to the engine, and can be configured to assist with an exhaust system, a detonation system, and/or a lubrication system. | 10-30-2014 |
| 20160061097 | UNIFLOW SCAVENGING 2-CYCLE ENGINE - A uniflow scavenging 2-cycle engine includes a cylinder inside which a combustion chamber is formed; a piston which slides within the cylinder; a scavenge port which is provided on one end side in a stroke direction of the piston in the cylinder to suck an active gas into the combustion chamber in accordance with the sliding movement of the piston; and a fuel injection unit which has an injection port located on the outside of the cylinder, and injects the fuel gas into the active gas sucked into the scavenge port. | 03-03-2016 |
| 20080302344 | Internal combustion engine and method of operating the same - An internal combustion engine has a cylinder ( | 12-11-2008 |
| 20100288252 | Non-Polluting Two-Stroke Engine with Air-Cooled Piston - A two-stroke internal combustion engine has at least one cylinder having a bore diameter, a central axis, a cylinder wall, and an upper and a lower extremity, a piston slip-fit in the cylinder, the piston having an overall height and a top surface, an upper portion and a lower portion each of approximately the bore diameter, each of the upper and lower portions having at least one seal ring between the piston and the cylinder wall, and a central portion of significantly less than the bore diameter and a height at least one-half of the overall piston height, providing an annular space between the central piston portion and the cylinder wall, a crank mechanism coupled to the piston in a manner providing a repeating stroke of a specific stroke length in the direction of the central axis of the cylinder, the repeating stroke providing a varying volume V between the top of the cylinder and the top surface of the piston, one or more exhaust ports through the cylinder wall, each exhaust port having a first height in the direction of the cylinder axis, centered at a first dimension from the top of the cylinder, one or more intake ports through the cylinder wall, each intake port having a second height in the direction of the cylinder axis, centered at a second dimension from the top of the cylinder, and a forced-air mechanism providing air to the one or more intake ports, wherein for a significant portion of every stroke both the one or more exhaust ports and the one or more intake ports are open to the annular space between the central piston portion and the cylinder wall, allowing the air pump to force air from the one or more intake ports around the central piston portion to the one or more exhaust ports. | 11-18-2010 |
| 20100288253 | AIR INTAKE PORTING FOR A TWO STROKE ENGINE - A two stroke engine of a particular configuration can have its power output increased by running bigger pistons and using ports in the piston skirt through which to conduct compressed air within the skirt through short passages in the cylinder housing that conduct the air from within the skirt to above the piston. As a result a larger piston can be used for the same spacing and opening size in the block to save the need to redesign the block and the crankshaft. A position adjuster for the piston moves it axially without rotation of the piston ports out of alignment with inlet ports in the housing. The piston rod is held in the crosshead using a flat to prevent rotation while an adjuster nut that is turned creates axial movement in the piston rod with a lock nut securing the final piston position. | 11-18-2010 |
| 20110017182 | TWO-STROKE INTERNAL COMBUSTION ENGINE - There is provided a loop-scavenged two-stroke internal combustion engine that is capable of effectively suppressing the short-circuiting of fresh charge (unburnt air-fuel mixture), while at the same time being capable of further improving scavenging efficiency, combustion efficiency, etc., as well as of improving the durability and output stability of a cylinder and a piston. One pair or a plurality of pairs of scavenging passages ( | 01-27-2011 |
| 20110017183 | TWO-STROKE INTERNAL COMBUSTION ENGINE - There is provided a reverse scavenged two-stroke internal combustion engine that is capable of effectively suppressing the short-circuiting of fresh charge (unburnt air-fuel mixture), while at the same time being capable of further improving scavenging efficiency, combustion efficiency, etc. The horizontal sectional shape of at least one pair of scavenging passages ( | 01-27-2011 |
| 20110079206 | TWO-STROKE ENGINE - In a two-stroke engine ( | 04-07-2011 |
| 20110146642 | Two-Stroke Engine, Sand Core for Producing a Two-Stroke Engine, and Method for Operating a Two-Stroke Engine - A two-stroke engine has a cylinder with a combustion chamber and a reciprocating piston for driving a crankshaft. Transfer passages connect the crankcase in at least one position of the piston with the combustion chamber and open by piston-controlled transfer ports into the combustion chamber. An inlet opens into the crankcase and an outlet is provided at the combustion chamber. The engine is dividable into four sectors parallel to a longitudinal cylinder axis. The transfer port of a first transfer passage is arranged in the first sector, the outlet is arranged in the second sector, the transfer port of a second transfer passage is provided in the third sector, and the inlet is arranged in the fourth sector. Within the cylinder the first and second transfer passages, at a spacing from a separation plane between cylinder and crankcase, pass together into one of the second and fourth sectors. | 06-23-2011 |
| 20110146643 | Two-Stroke Engine - A two-stroke engine has a cylinder with a combustion chamber and a piston reciprocatingly supported in the cylinder. A crankshaft is rotatably supported in a crankcase and driven by the piston. At least one transfer passage connects the crankcase in at least one position of the piston with the combustion chamber and has a piston-controlled transfer port that opens into the combustion chamber and an opening that opens into the crankcase. A mixture inlet opens into the crankcase. An outlet is provided at the combustion chamber. The transfer port and the opening are displaced relative to each other in a circumferential direction of the cylinder. At least one wall section of the transfer passage forms an undercut when viewed from the crankcase in a direction of a longitudinal cylinder axis of the cylinder and is delimited by a separate component inserted into the cylinder from a side facing the crankcase. | 06-23-2011 |
| 20110197868 | Two-stroke engine - A two-stroke engine ( | 08-18-2011 |
| 20110247601 | TWO-CYCLE ENGINE AND LOW EMISSION CONTROL SYSTEM - A two-cycle engine including exhaust, air inlet, scavenging and air/fuel intake windows disposed in the cylinder wall, a reciprocating piston driving a crankshaft, and curved gas-conveying channels connecting the crankcase chamber with the cylinder bore, the channels being opened by the reciprocating piston and the channels producing centrifugation of gases circulating therein to produce lean and rich components of an air/fuel mixture, wherein the lean component is circulated in a region of the combustion chamber remote from the exhaust window for promoting reduced combustion residues. | 10-13-2011 |
| 20110308507 | TWO-STROKE CYCLE COMBUSTION ENGINE OF AIR SCAVENGING TYPE - A two-stroke cycle combustion engine of an air scavenging type includes one or more scavenging passages ( | 12-22-2011 |
| 20120006308 | Piston for a Two-Stroke Engine - A transfer passage design for a two stroke internal combustion engine that allows for regulation of the air/fuel flow as the piston nears the bottom of its stroke. Additionally, a cut out in the skirt of the piston may allow for additional gaseous communication between the crankcase chamber and the transfer passage. | 01-12-2012 |
| 20120024276 | LOOP SCAVENGED TWO-STROKE INTERNAL COMBUSTION ENGINE - A loop scavenged two-stroke internal combustion engine which can effectively restrain blow-by of fresh gas with a relatively simple configuration is provided. A horizontal scavenging angle θb in at least one spot of a scavenging passage | 02-02-2012 |
| 20120060806 | Two-Stroke Engine - A two-stroke engine has a cylinder having a cylinder bore with a combustion chamber and an outlet connected with the combustion chamber. A piston is disposed in the cylinder and delimits the combustion chamber. The piston has a piston recess. A crankcase is provided that has a crankshaft rotatably supported therein. The piston drives in rotation the crankshaft. In at least one position of the piston, the crankcase is connected by a transfer passage with the combustion chamber. An air passage is provided as well as a mixture passage that has a mixture inlet that is disposed at the cylinder bore and opens into the cylinder bore and is piston-controlled. The transfer passage is connected by the piston recess to the air passage when the piston is at top dead center. The piston recess has a connection to the mixture inlet in at least one position of the piston. | 03-15-2012 |
| 20120247442 | STRATIFIED TWO-STROKE ENGINE - Various embodiments include two-stroke stratified engines and dual passage carburetors for use with gaseous fuel and liquid fuels. A stratified air-head engine having a simpler intake manifold with a single air pipe for induction of air is included. | 10-04-2012 |
| 20120260900 | STRATIFIED SCAVENGING TWO-CYCLE ENGINE - A laminar-scavenging two-cycle engine which has a high laminar-scavenging effect, includes a scavenging passage having a crankcase side portion extending along a crankcase, and a cylinder side portion extending along a cylinder and having a length larger than the sum of the diameter and stroke of the cylinder. An ambient air introducing passage for introducing leading air into the scavenging passage is connected to an intermediate portion of the scavenging passage. A notch for opening a scavenging port to the side of the crankcase when a piston is near the top dead center is formed in the piston. | 10-18-2012 |
| 20120325191 | SCAVENGING PASSAGE STRUCTURE FOR TWO-STROKE ENGINE - A scavenging passage structure for a two-stroke engine, having a scavenging passage communicating a scavenging port provided in a cylinder with a crank chamber formed inside a crankcase, the scavenging passage being formed to extend through respective fastening surfaces of the cylinder and the crankcase. The scavenging passage includes a cover member attached inside the crankcase to be in contact with an inner wall surface of the crankcase, and a groove formed in at least one of the inner wall surface of the crankcase contacting the cover member, and the cover member contacting the inner wall surface of the crankcase, the groove forming part of the scavenging passage connecting to the crank chamber and to an upper face of the crankcase. | 12-27-2012 |
| 20130037011 | Two-Stroke Internal Combustion Engine - It is intended to effectively prevent blow-by with no need for large changes in typical structures of two-cycle internal combustion engines. A main scavenging passage ( | 02-14-2013 |
| 20130061835 | Two-Stroke Engine and a Method for the Operation thereof - A two-stroke engine has a cylinder wherein a piston is journalled for reciprocating movement. The piston delimits a combustion chamber configured in the cylinder. The engine has an outlet from the combustion chamber and a transfer channel which opens at an inlet opening into the crankcase and at a transfer window in the combustion chamber. The piston drives a crankshaft via a connecting rod. The crankshaft is rotatably journalled in the crankcase. At least one control element for the inlet opening is connected to the crankshaft so as to rotate therewith. | 03-14-2013 |
| 20130068205 | TWO-STROKE ENGINE AND LUBRICATION - Various embodiments include a two-stroke engine and a carburetor for use with gaseous fuel, such as hydrogen, methane, liquid petroleum gas, pure propane, and butane. | 03-21-2013 |
| 20140060507 | ENGINE AND ENGINE-DRIVEN WORKING MACHINE - An engine and an engine-driven working machine which enable blow-though prevention of an uncombusted air-fuel mixture and control of the number of times of combustion, stabilize operation during idling, and ensure output and acceleration performance during working are provided. A two-cycle engine having: a piston; a crankcase in which scavenging passages are formed; and a cylinder in which scavenging ports communicated with the scavenging passages and an exhaust port for discharging a combustion gas are formed. In the two-cycle engine, at least two or more systems of the scavenging passages having mutually different opening/closing systems are formed in the crankcase. | 03-06-2014 |
| 20140182571 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A stratified scavenging two-stroke engine includes a first scavenging passage that extends from a first scavenging intake that opens to the inside of the crankcase to a first scavenging port that opens to the inside of a cylinder, and a second scavenging passage that extends from a second scavenging intake that opens to the inside of the crankcase to a second scavenging port that opens to the inside of the cylinder. The first and second passages are formed so as to communicate with each other via a communicating portion. An air passage is connected to the first passage at a position closer to the first scavenging intake than the communicating portion. A first check valve inhibits a flow from the first passage to the inside of the crankcase, and a second check valve inhibits a flow from the first passage through the air passage to the outside. | 07-03-2014 |
| 20140318517 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A stratified scavenging two-stroke engine includes: an intake passage that connects an intake opening through an outer surface of a cylinder member with an intake port opening to the inside of a cylinder, and supplies gaseous mixture of fuel and air; an exhaust passage that connects an exhaust outlet opening through the outer surface of the cylinder member with an exhaust port opening to the inside of the cylinder, and discharges combustion gas; a scavenging passage; and an air passage that connects an air inlet opening through the outer surface of the cylinder member with the scavenging passage and supplies pre-scavenging air into the scavenging passage. The intake and the air inlet are arranged at positions opposite from the exhaust port across the axis of the cylinder, and arranged side by side in a substantially circumferential direction of the cylinder or a direction substantially perpendicular to the axis of the cylinder. | 10-30-2014 |
| 20160069296 | TWO-STROKE ENGINE - A two-stroke engine has a cylinder with a combustion chamber formed therein. The combustion chamber is delimited by a piston. The cylinder has a base on which extends a partition plane whereat the cylinder is separated from a crankcase. The combustion chamber is, in at least one piston position, connected via at least one transfer channel to the crankcase interior. The transfer channel passes from the cylinder into the crankcase at at least one opening. A side wall of the transfer channel has, in the cylinder, a first region wherein the wall encloses an angle of 90° with the cylinder longitudinal axis. Between the first region and the opening as viewed in the cylinder circumferential direction is arranged a second wall region. The second region has a spacing, measured parallel to the cylinder longitudinal axis, to the partition plane. The spacing is greater than the spacing in the first region. | 03-10-2016 |
| 20160097344 | Air Leading-Type Stratified Scavenging Two-Stroke Internal-Combustion Engine - The efficiency of charging air to a scavenging channel is enhanced by generating a gas flow in a piston groove simultaneously with the piston groove coming into communication with an air port. A piston groove | 04-07-2016 |
| 20090095269 | Two-Cycle Engine - In a stratified scavenging two-cycle engine | 04-16-2009 |
| 20100037877 | TWO CYCLE ENGINE AND TWO CYCLE ENGINE TOOL - The invention provides a two cycle engine which effectively suppresses an intrusion of a combustion gas into a crank chamber. Further, the invention provides a two cycle engine tool provided with the two cycle engine mentioned above. An engine is provided with a cylinder having two scavenge air ports at different positions in a cylinder circumference direction, and scavenge air inflow ports communicating individually with these two scavenge air ports via a scavenge air passage, and a piston in which two scavenge air communication ports are formed at positions corresponding to the scavenge air inflow ports, and is structured to swirl the gas flowing into the piston from the cylinder through the scavenge air passage, in an upper portion of the internal space of the piston, and retains the gas in the upper portion of the internal space of the piston. | 02-18-2010 |
| 20110180054 | Two-Stroke Internal Combustion Engine and Its Scavenging Method - In a two-stroke internal combustion engine using air for scavenging its combustion chamber ( | 07-28-2011 |
| 20120024275 | TWO-STROKE INTERNAL COMBUSTION ENGINE - A two stroke crank case scavenged two-stroke internal combustion engine, the engine including: a cylinder ( | 02-02-2012 |
| 20130255652 | INTERNAL COMBUSTION ENGINE, IN PARTICULAR TWO-STROKE INTERNAL COMBUSTION ENGINE - To create an internal combustion engine including a crankcase and a cylinder, wherein a piston is guided in the cylinder to perform a stroke movement and movably defines a combustion chamber, and wherein at least one transfer channel, through which ignition mixture is guided from the crankcase into the combustion chamber, is arranged in the cylinder, which leads to a further improvement of the exhaust gas quality and/or of the fuel consumption, in particular for creating an improved metering of ignition mixture into the fuel chamber, it is proposed for the piston to encompass a lower piston edge, which interacts with at least one counter body such that an inlet cross section of the transfer channel for the inflow of the ignition mixture from the crankcase into the transfer channel can be controlled by the stroke movement of the piston by the lower piston edge. | 10-03-2013 |
| 20150337765 | Stratified Scavenging Two-Stroke Internal Combustion Engine And Carburetor Thereof - A carburetor achieves better emission characteristics while improving a combustion state by increasing a delivery ratio of a stratified scavenging engine and reducing intake resistance. No dividing wall is provided between a throttle valve | 11-26-2015 |
| 20150377117 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A stratified scavenging two-stroke engine includes a first scavenging passage that extends from a first scavenging intake that opens to the inside of the crankcase to a scavenging port that opens to the inside of a cylinder, and a second scavenging passage that branches from the first scavenging passage and extends to a second scavenging intake that opens to the inside of the crankcase. An air passage is provided to supply air for pre-scavenging into the first scavenging passage at a position closer to the first scavenging intake than a position at which the second scavenging passage branches from the first scavenging passage. A first check valve inhibits a flow of air from the first scavenging passage during an upward stroke of the piston, and a second check valve inhibits a flow of air and a gaseous mixture from the first scavenging passage during a downward stroke of the piston. | 12-31-2015 |
| 20160169087 | Air Leading Type Two-Stroke Engine And Intake System For Same, And Carburetor | 06-16-2016 |
| 20160376979 | Stratified Scavenging Two-Stroke Internal Combustion Engine, Air Cleaner Of The Same, And Intake Method - An amplitude of a pressure fluctuation in a vicinity of a main nozzle of a carburetor ( | 12-29-2016 |
| 20080308084 | CYLINDER/CRANKCASE GROUP FOR TWO-STROKE INTERNAL COMBUSTION ENGINES PROVIDED WITH MEANS FOR SUPERCHARGING THE ENGINE - A fuel injection system for a two-stroke internal combustion engine ( | 12-18-2008 |
| 20160252011 | TWO-CYCLE GAS ENGINE | 09-01-2016 |
| 20090283081 | AIR INTAKE PORTING FOR A TWO STROKE ENGINE - A two stroke engine of a particular configuration can have its power output increased by running bigger pistons and using ports in the piston skirt through which to conduct compressed air within the skirt through short passages in the cylinder housing that conduct the air from within the skirt to above the piston. As a result a larger piston can be used for the same spacing and opening size in the block to save the need to redesign the block and the crankshaft. A position adjuster for the piston moves it axially without rotation of the piston ports out of alignment with inlet ports in the housing. The piston rod is held in the crosshead using a flat to prevent rotation while an adjuster nut that is turned creates axial movement in the piston rod with a lock nut securing the final piston position. | 11-19-2009 |
| 20120097141 | TWO-STROKE ENGINE WITH A COMPRESSED-AIR-ASSISTED FUEL-INJECTION SYSTEM - A two-stroke internal combustion engine is provided and includes a casing, a cylinder, a piston skirt, an aspirating port, a carburetor which supplies the casing with an air/fuel mixture, through said aspirating port, a transfer conduit which opens into the cylinder through an air/fuel inlet port, and a fuel storage system, or resonance tube which communicates with a first port located above the aspirating port, and with a second port located below the aspirating port. The first port and the second port are alternatingly opened by the piston skirt, which includes a through-hole having a diameter between 0.5 and 3.0 mm. The through-hole being located, when the piston is mounted in the engine, in a same radial plane as the second port. | 04-26-2012 |
| 20120318250 | TWO-STROKE ENGINE - The two-stroke engine has a plurality of intake passages extending from the external air inlet port through the crankcase, separating the intake air charge from the air and oil vapor within the crankcase. The piston has one or more corresponding inlet tubes depending therefrom that telescope within the crankcase intake passages as the piston reciprocates. All intake air travels through these passages and is separated from the remainder of the crankcase volume. The incoming air charge passes through a concentric poppet valve in the piston crown to enter the combustion chamber. Fuel is provided by conventional direct or port injection and ignition is provided by one or more conventional spark plugs. Diesel operation is achievable when the engine is configured appropriately. Exhaust exits the combustion chamber through a poppet valve in the cylinder head, the poppet valve being actuated by a rocker arm and pushrod from a crankshaft driven cam. | 12-20-2012 |
| 20140331981 | AIR INTAKE PORTING FOR A TWO STROKE ENGINE - A two stroke engine of a particular configuration can have its power output increased by running bigger pistons and using ports in the piston skirt through which to conduct compressed air within the skirt through short passages in the cylinder housing that conduct the air from within the skirt to above the piston. As a result a larger piston can be used for the same spacing and opening size in the block to save the need to redesign the block and the crankshaft. A position adjuster for the piston moves it axially without rotation of the piston ports out of alignment with inlet ports in the housing. The piston rod is held in the crosshead using a flat to prevent rotation while an adjuster nut that is turned creates axial movement in the piston rod with a lock nut securing the final piston position. | 11-13-2014 |
| 20150345372 | ASYMMETRIC TRANSFER AND INTAKE IN TWO-STROKES - With shaped connecting rod, piston and cylinder, an advantageous asymmetric timing of the two-stroke engine is achieved, wherein the combustion chamber communicates with the crankcase through a transfer port controlled by the piston and through a respective piston port controlled by the connecting rod, with the transfer port and its respective piston port arranged “in series”, and wherein an intake port communicates with the crankcase through a piston port controlled by the connecting rod, with the intake port and its respective piston port arranged “in series”. | 12-03-2015 |
| 20090007894 | Two-Cycle Engine - A stratified scavenging two-cycle engine includes: an air passage for delivering pure air to a scavenging passage; an air valve for opening and closing the air passage; and an auxiliary air passage for delivering the pare air to the scavenging passage when the air valve is completely closed. An amount of air for air-fuel mixture sucked in a crank chamber is reduced to increase the concentration of the air-fuel mixture, and air that supplements the reduced amount of the air for air-fuel mixture is fed into the scavenging passage through the auxiliary air passage, which enables the engine to be smoothly accelerated even when being suddenly accelerated from an idling state with an appropriate concentration of the air-fuel mixture sucked in a cylinder chamber during idling. | 01-08-2009 |
| 20110162630 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A two-stroke engine is provided with a piston, a cylinder that houses the piston in a manner allowing reciprocation, a crankshaft that is connected to the piston via a connecting rod, a crankcase that houses the crankshaft in a manner allowing rotation, a mixture gas passage that introduces mixture gas into the crankcase, a scavenging passage that extends between a scavenging intake that opens into the crankcase and a scavenging port that opens into the cylinder; and an air passage that is connected to an intermediate position of the scavenging passage for introducing air into the scavenging passage. The engine is adapted such that, in a part of an upward stroke period of the piston, the crankcase in which negative pressure is generated is connected to the scavenging passage via the scavenging port. Accordingly, most of air introduced into the scavenging passage form the air passage flows toward the scavenging port and into the cylinder without changing the direction of flow. | 07-07-2011 |
| 20120097142 | PRE-COMBUSTION CYCLE PRESSURISATION SYSTEM - A two stroke internal combustion engine ( | 04-26-2012 |
| 20130092137 | FIXING DEVICE FOR TWO-STROKE ENGINE - A two-stroke engine includes a cylinder, a combustion chamber formed in a cylinder running surface, and a cylinder head and with an outlet port of the combustion chamber. A transfer port is formed in the cylinder in order to connect the interior space of a crankcase of the two-stroke engine with the combustion chamber. The cylinder includes an axial bore, at least partially penetrating a wall of the outlet port and/or of the transfer port, so that the bore at least partially forms an opening at the wall side in the outlet port and/or in the transfer port. A pin is in the bore. The pin closes the opening at the wall side in such a way that the original surface of the wall of the outlet port and/or of the transfer port is substantially restored in the area of the opening at the wall side. | 04-18-2013 |
| 20130037010 | UNIFLOW PORT-LESS TWO-STROKE ENGINE - Uniflow two-stroke engines without ports on the cylinder and with four-stroke lubrication | 02-14-2013 |
| 20140251293 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A two-stroke engine is provided with a scavenging passage that extends between a scavenging intake that opens into a crankcase and a scavenging port that opens into a cylinder, and an air passage that is connected to an intermediate position of a scavenging passage for introducing air into the scavenging passage. A first check valve that is disposed within a section of a scavenging passage between a scavenging intake and the intermediate position. A second check valve that is disposed within the air passage. The section of the scavenging passage between the intermediate position and the scavenging intake, the air passage, and a mixture gas passage are arranged in a substantially same direction with respect to a longitudinal axis of the cylinder. | 09-11-2014 |
| 123073000 | Valves for crankcase | 4 |
| 20080302345 | A Crankcase Scavenged Two-Stroke Internal Combustion Engine Having an Additional Air Supply - A crankcase scavenged two-stroke internal combustion engine ( | 12-11-2008 |
| 20090056687 | Two-stroke, homogeneous charge, spark-ignition engine - A method for combusting fuel in an engine involving decreasing a first volume of air to a third volume, in two stages, the first stage in a crankcase compressor decreasing a first volume of air to a second volume and a second stage in the engine cylinder decreasing a second volume of a gas to a third volume, injection of fuel between the two stages into partially compressed hot air to provide homogenous charge to the cylinder to begin second stage compression in the cylinder having two variable compression ratios, a first variable compression ratio for low loads to reach a compression temperature slightly below the autoignition temperature of the homogeneous charge such that spark ignited HCCI-like combustion being emission free, a second much smaller variable compression ratio for preventing pre-ignition at high loads, then increasing the pressure at constant volume via combusting homogeneous charge in the cylinder, increasing the third volume of gas to a fourth volume (an expansion process having a chosen expansion ratio much greater than the compression ratio), decreasing the pressure to atmospheric pressure while removing heat under constant volume, and finally decreasing the volume of gas to the first volume while removing heat under constant pressure to complete a two-stroke homogeneous charge spark-ignition cycle. Also disclosed is an engine employing the two-stroke HCSI cycle. | 03-05-2009 |
| 20090308369 | Laminated Counterweight for Timing Control - A stratified two-stroke engine having a laminated counterweight is disclosed. The laminated counterweight includes a traditional counterweight portion and a laminate portion. The laminate portion has an approximately circular peripheral shape and at least one notch. In operation, the notch may be used to time the opening and closing of a mixture port or a transfer port. | 12-17-2009 |
| 20100012106 | STRATIFIED SCAVENGING TWO-CYCLE ENGINE - Provided is a laminar-scavenging two-cycle engine, which can have a higher laminar-scavenging effect than that of the laminar-scavenging two-cycle engine of the prior art and which can expect drastically excellent effects on the stabilization of combustion and on the blow-by prevention. The laminar-scavenging two-cycle engine is characterized in that a scavenging passage ( | 01-21-2010 |
| 20100059030 | Stratified Scavenging Two-Cycle Engine - A stratified scavenging two-cycle engine that has a simpler structure than conventional stratified scavenging two-cycle engines and that has an excellent blow-by prevention effect etc. In an air intake stroke, lead air passes a lead-air port ( | 03-11-2010 |
| 20100139637 | TWO-STROKE ENGINE - An object is to provide a two-stroke engine achieving effective reduction of blow-by while implementing efficient gas exchange. In a two-stroke engine | 06-10-2010 |
| 20100170485 | TWO STROKE COMBUSTION ENGINE - The invention related to a two-stroke internal combustion engine ( | 07-08-2010 |
| 20100252011 | IDLE SPEED CONTROL FOR A HANDHELD POWER TOOL - Method for controlling fuel metering in a carburetor or a low pressure injection system of an internal combustion engine when the engine is operating at idle speed, the method includes the steps of:
| 10-07-2010 |
| 20100307469 | Method for operating a two-stroke engine - A two-stroke engine ( | 12-09-2010 |
| 20120145137 | TWO-CYCLE ENGINE - An engine includes a cylinder block, and a piston slidably mounted in a cylinder, with the cylinder block being formed with an exhaust passage leading to a combustion chamber through an exhaust port, a first scavenging port opened to an inner circumferential surface of the cylinder, a first communication passage formed from the first scavenging port in a radial direction of the cylinder, and a first scavenging passage formed with an opening on a bottom surface of the first communication passage, in which a side surface on a far side from the exhaust port forming the communication passage is formed towards the far side from the exhaust port in the combustion chamber, and the opening portion of the first scavenging passage and a landing portion formed in the periphery of the opening portion are formed at a bottom portion of the communication passage. | 06-14-2012 |
| 20120152217 | TWO-STROKE ENGINE - A two-stroke engine has a cylinder with a combustion chamber which is bounded by a piston which drives a crankshaft which rotates in a crankcase. The crankcase is connected to the combustion chamber via an overflow passage in the lower dead centre region of the piston. The two stroke engine has an intake passage. A carburetor forms a section of the intake passage. The intake passage is partially divided into an air passage, which supplies combustion air into an overflow passage, and a mixture passage which opens into the crankcase. A throttle valve mounted pivotably in the carburetor controls the combustion air quantity supplied to the air and mixture passages. An air-guiding element arranged on the passage wall of the air passage guides the combustion air passing between the throttle valve and passage wall in the idling position of the throttle valve in the direction of the mixture passage. | 06-21-2012 |
| 20120152218 | TWO-STROKE ENGINE - A two-stroke engine, comprising: a crankcase; a cylinder connected to said crankcase; a combustion chamber defined by a reciprocally mounted piston within said cylinder; a crankshaft mounted rotatably in said crankcase and drivingly connected with said piston; at least one overflow passage connecting the crankcase and the combustion chamber when the piston is positioned in the lower dead center region; a connecting stub attached to said cylinder which contains an intake passage that opens into the crankcase and supplies fuel and combustion air, said intake passage including therein an air-fuel mixture passage, wherein said connecting stub contains at least one section of the mixture passage; at least one fuel opening for supplying fuel into said mixture passage; and a guiding rib positioned within said connecting stub and oriented longitudinally in the mixture passage and protruding into the mixture passage. | 06-21-2012 |
| 20120304973 | Two-Stroke Engine - An engine has a cylinder wherein a reciprocating piston is mounted. The piston drives, via a connecting rod ( | 12-06-2012 |
| 20140238371 | Two-Stroke Internal Combustion Engine - The scavenging passage includes a wall surface that defines an orientation direction of a main scavenging gas flow spouting from the scavenging port to the cylinder chamber. In a boundary portion between the scavenging port and the scavenging passage, a wall surface located on an opposite side of the exhaust port is composed of an inclined surface inclined in a direction further away from the exhaust port than a wall surface of a deep portion of the scavenging passage. The scavenging port includes a rear wall surface located in a portion on the opposite side of the exhaust port. The rear wall surface continues to the inclined surface to extend in the direction away from the exhaust port and generates an incidental scavenging gas flow incidental to the main scavenging gas flow and higher in speed than the main scavenging gas flow. | 08-28-2014 |
| 20140318518 | OPPOSED PISTON INTERNAL COMBUSTION ENGINE WITH INVISCID LAYER SEALING - An opposed-piston engine that forms an inviscid layer between pistons and the respective cylinder walls. In an aspect, the opposed-piston engine utilizes a Scotch yoke assembly that includes rigidly connected opposed combustion pistons. In an aspect, the Scotch yoke assembly is configured to transfer power from the combustion pistons to a crankshaft assembly. In an aspect, the crankshaft assembly can be configured to have dual flywheels that are internal to the engine, and can be configured to assist with an exhaust system, a detonation system, and/or a lubrication system. | 10-30-2014 |
| 20160061097 | UNIFLOW SCAVENGING 2-CYCLE ENGINE - A uniflow scavenging 2-cycle engine includes a cylinder inside which a combustion chamber is formed; a piston which slides within the cylinder; a scavenge port which is provided on one end side in a stroke direction of the piston in the cylinder to suck an active gas into the combustion chamber in accordance with the sliding movement of the piston; and a fuel injection unit which has an injection port located on the outside of the cylinder, and injects the fuel gas into the active gas sucked into the scavenge port. | 03-03-2016 |
| 20080302344 | Internal combustion engine and method of operating the same - An internal combustion engine has a cylinder ( | 12-11-2008 |
| 20100288252 | Non-Polluting Two-Stroke Engine with Air-Cooled Piston - A two-stroke internal combustion engine has at least one cylinder having a bore diameter, a central axis, a cylinder wall, and an upper and a lower extremity, a piston slip-fit in the cylinder, the piston having an overall height and a top surface, an upper portion and a lower portion each of approximately the bore diameter, each of the upper and lower portions having at least one seal ring between the piston and the cylinder wall, and a central portion of significantly less than the bore diameter and a height at least one-half of the overall piston height, providing an annular space between the central piston portion and the cylinder wall, a crank mechanism coupled to the piston in a manner providing a repeating stroke of a specific stroke length in the direction of the central axis of the cylinder, the repeating stroke providing a varying volume V between the top of the cylinder and the top surface of the piston, one or more exhaust ports through the cylinder wall, each exhaust port having a first height in the direction of the cylinder axis, centered at a first dimension from the top of the cylinder, one or more intake ports through the cylinder wall, each intake port having a second height in the direction of the cylinder axis, centered at a second dimension from the top of the cylinder, and a forced-air mechanism providing air to the one or more intake ports, wherein for a significant portion of every stroke both the one or more exhaust ports and the one or more intake ports are open to the annular space between the central piston portion and the cylinder wall, allowing the air pump to force air from the one or more intake ports around the central piston portion to the one or more exhaust ports. | 11-18-2010 |
| 20100288253 | AIR INTAKE PORTING FOR A TWO STROKE ENGINE - A two stroke engine of a particular configuration can have its power output increased by running bigger pistons and using ports in the piston skirt through which to conduct compressed air within the skirt through short passages in the cylinder housing that conduct the air from within the skirt to above the piston. As a result a larger piston can be used for the same spacing and opening size in the block to save the need to redesign the block and the crankshaft. A position adjuster for the piston moves it axially without rotation of the piston ports out of alignment with inlet ports in the housing. The piston rod is held in the crosshead using a flat to prevent rotation while an adjuster nut that is turned creates axial movement in the piston rod with a lock nut securing the final piston position. | 11-18-2010 |
| 20110017182 | TWO-STROKE INTERNAL COMBUSTION ENGINE - There is provided a loop-scavenged two-stroke internal combustion engine that is capable of effectively suppressing the short-circuiting of fresh charge (unburnt air-fuel mixture), while at the same time being capable of further improving scavenging efficiency, combustion efficiency, etc., as well as of improving the durability and output stability of a cylinder and a piston. One pair or a plurality of pairs of scavenging passages ( | 01-27-2011 |
| 20110017183 | TWO-STROKE INTERNAL COMBUSTION ENGINE - There is provided a reverse scavenged two-stroke internal combustion engine that is capable of effectively suppressing the short-circuiting of fresh charge (unburnt air-fuel mixture), while at the same time being capable of further improving scavenging efficiency, combustion efficiency, etc. The horizontal sectional shape of at least one pair of scavenging passages ( | 01-27-2011 |
| 20110079206 | TWO-STROKE ENGINE - In a two-stroke engine ( | 04-07-2011 |
| 20110146642 | Two-Stroke Engine, Sand Core for Producing a Two-Stroke Engine, and Method for Operating a Two-Stroke Engine - A two-stroke engine has a cylinder with a combustion chamber and a reciprocating piston for driving a crankshaft. Transfer passages connect the crankcase in at least one position of the piston with the combustion chamber and open by piston-controlled transfer ports into the combustion chamber. An inlet opens into the crankcase and an outlet is provided at the combustion chamber. The engine is dividable into four sectors parallel to a longitudinal cylinder axis. The transfer port of a first transfer passage is arranged in the first sector, the outlet is arranged in the second sector, the transfer port of a second transfer passage is provided in the third sector, and the inlet is arranged in the fourth sector. Within the cylinder the first and second transfer passages, at a spacing from a separation plane between cylinder and crankcase, pass together into one of the second and fourth sectors. | 06-23-2011 |
| 20110146643 | Two-Stroke Engine - A two-stroke engine has a cylinder with a combustion chamber and a piston reciprocatingly supported in the cylinder. A crankshaft is rotatably supported in a crankcase and driven by the piston. At least one transfer passage connects the crankcase in at least one position of the piston with the combustion chamber and has a piston-controlled transfer port that opens into the combustion chamber and an opening that opens into the crankcase. A mixture inlet opens into the crankcase. An outlet is provided at the combustion chamber. The transfer port and the opening are displaced relative to each other in a circumferential direction of the cylinder. At least one wall section of the transfer passage forms an undercut when viewed from the crankcase in a direction of a longitudinal cylinder axis of the cylinder and is delimited by a separate component inserted into the cylinder from a side facing the crankcase. | 06-23-2011 |
| 20110197868 | Two-stroke engine - A two-stroke engine ( | 08-18-2011 |
| 20110247601 | TWO-CYCLE ENGINE AND LOW EMISSION CONTROL SYSTEM - A two-cycle engine including exhaust, air inlet, scavenging and air/fuel intake windows disposed in the cylinder wall, a reciprocating piston driving a crankshaft, and curved gas-conveying channels connecting the crankcase chamber with the cylinder bore, the channels being opened by the reciprocating piston and the channels producing centrifugation of gases circulating therein to produce lean and rich components of an air/fuel mixture, wherein the lean component is circulated in a region of the combustion chamber remote from the exhaust window for promoting reduced combustion residues. | 10-13-2011 |
| 20110308507 | TWO-STROKE CYCLE COMBUSTION ENGINE OF AIR SCAVENGING TYPE - A two-stroke cycle combustion engine of an air scavenging type includes one or more scavenging passages ( | 12-22-2011 |
| 20120006308 | Piston for a Two-Stroke Engine - A transfer passage design for a two stroke internal combustion engine that allows for regulation of the air/fuel flow as the piston nears the bottom of its stroke. Additionally, a cut out in the skirt of the piston may allow for additional gaseous communication between the crankcase chamber and the transfer passage. | 01-12-2012 |
| 20120024276 | LOOP SCAVENGED TWO-STROKE INTERNAL COMBUSTION ENGINE - A loop scavenged two-stroke internal combustion engine which can effectively restrain blow-by of fresh gas with a relatively simple configuration is provided. A horizontal scavenging angle θb in at least one spot of a scavenging passage | 02-02-2012 |
| 20120060806 | Two-Stroke Engine - A two-stroke engine has a cylinder having a cylinder bore with a combustion chamber and an outlet connected with the combustion chamber. A piston is disposed in the cylinder and delimits the combustion chamber. The piston has a piston recess. A crankcase is provided that has a crankshaft rotatably supported therein. The piston drives in rotation the crankshaft. In at least one position of the piston, the crankcase is connected by a transfer passage with the combustion chamber. An air passage is provided as well as a mixture passage that has a mixture inlet that is disposed at the cylinder bore and opens into the cylinder bore and is piston-controlled. The transfer passage is connected by the piston recess to the air passage when the piston is at top dead center. The piston recess has a connection to the mixture inlet in at least one position of the piston. | 03-15-2012 |
| 20120247442 | STRATIFIED TWO-STROKE ENGINE - Various embodiments include two-stroke stratified engines and dual passage carburetors for use with gaseous fuel and liquid fuels. A stratified air-head engine having a simpler intake manifold with a single air pipe for induction of air is included. | 10-04-2012 |
| 20120260900 | STRATIFIED SCAVENGING TWO-CYCLE ENGINE - A laminar-scavenging two-cycle engine which has a high laminar-scavenging effect, includes a scavenging passage having a crankcase side portion extending along a crankcase, and a cylinder side portion extending along a cylinder and having a length larger than the sum of the diameter and stroke of the cylinder. An ambient air introducing passage for introducing leading air into the scavenging passage is connected to an intermediate portion of the scavenging passage. A notch for opening a scavenging port to the side of the crankcase when a piston is near the top dead center is formed in the piston. | 10-18-2012 |
| 20120325191 | SCAVENGING PASSAGE STRUCTURE FOR TWO-STROKE ENGINE - A scavenging passage structure for a two-stroke engine, having a scavenging passage communicating a scavenging port provided in a cylinder with a crank chamber formed inside a crankcase, the scavenging passage being formed to extend through respective fastening surfaces of the cylinder and the crankcase. The scavenging passage includes a cover member attached inside the crankcase to be in contact with an inner wall surface of the crankcase, and a groove formed in at least one of the inner wall surface of the crankcase contacting the cover member, and the cover member contacting the inner wall surface of the crankcase, the groove forming part of the scavenging passage connecting to the crank chamber and to an upper face of the crankcase. | 12-27-2012 |
| 20130037011 | Two-Stroke Internal Combustion Engine - It is intended to effectively prevent blow-by with no need for large changes in typical structures of two-cycle internal combustion engines. A main scavenging passage ( | 02-14-2013 |
| 20130061835 | Two-Stroke Engine and a Method for the Operation thereof - A two-stroke engine has a cylinder wherein a piston is journalled for reciprocating movement. The piston delimits a combustion chamber configured in the cylinder. The engine has an outlet from the combustion chamber and a transfer channel which opens at an inlet opening into the crankcase and at a transfer window in the combustion chamber. The piston drives a crankshaft via a connecting rod. The crankshaft is rotatably journalled in the crankcase. At least one control element for the inlet opening is connected to the crankshaft so as to rotate therewith. | 03-14-2013 |
| 20130068205 | TWO-STROKE ENGINE AND LUBRICATION - Various embodiments include a two-stroke engine and a carburetor for use with gaseous fuel, such as hydrogen, methane, liquid petroleum gas, pure propane, and butane. | 03-21-2013 |
| 20140060507 | ENGINE AND ENGINE-DRIVEN WORKING MACHINE - An engine and an engine-driven working machine which enable blow-though prevention of an uncombusted air-fuel mixture and control of the number of times of combustion, stabilize operation during idling, and ensure output and acceleration performance during working are provided. A two-cycle engine having: a piston; a crankcase in which scavenging passages are formed; and a cylinder in which scavenging ports communicated with the scavenging passages and an exhaust port for discharging a combustion gas are formed. In the two-cycle engine, at least two or more systems of the scavenging passages having mutually different opening/closing systems are formed in the crankcase. | 03-06-2014 |
| 20140182571 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A stratified scavenging two-stroke engine includes a first scavenging passage that extends from a first scavenging intake that opens to the inside of the crankcase to a first scavenging port that opens to the inside of a cylinder, and a second scavenging passage that extends from a second scavenging intake that opens to the inside of the crankcase to a second scavenging port that opens to the inside of the cylinder. The first and second passages are formed so as to communicate with each other via a communicating portion. An air passage is connected to the first passage at a position closer to the first scavenging intake than the communicating portion. A first check valve inhibits a flow from the first passage to the inside of the crankcase, and a second check valve inhibits a flow from the first passage through the air passage to the outside. | 07-03-2014 |
| 20140318517 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A stratified scavenging two-stroke engine includes: an intake passage that connects an intake opening through an outer surface of a cylinder member with an intake port opening to the inside of a cylinder, and supplies gaseous mixture of fuel and air; an exhaust passage that connects an exhaust outlet opening through the outer surface of the cylinder member with an exhaust port opening to the inside of the cylinder, and discharges combustion gas; a scavenging passage; and an air passage that connects an air inlet opening through the outer surface of the cylinder member with the scavenging passage and supplies pre-scavenging air into the scavenging passage. The intake and the air inlet are arranged at positions opposite from the exhaust port across the axis of the cylinder, and arranged side by side in a substantially circumferential direction of the cylinder or a direction substantially perpendicular to the axis of the cylinder. | 10-30-2014 |
| 20160069296 | TWO-STROKE ENGINE - A two-stroke engine has a cylinder with a combustion chamber formed therein. The combustion chamber is delimited by a piston. The cylinder has a base on which extends a partition plane whereat the cylinder is separated from a crankcase. The combustion chamber is, in at least one piston position, connected via at least one transfer channel to the crankcase interior. The transfer channel passes from the cylinder into the crankcase at at least one opening. A side wall of the transfer channel has, in the cylinder, a first region wherein the wall encloses an angle of 90° with the cylinder longitudinal axis. Between the first region and the opening as viewed in the cylinder circumferential direction is arranged a second wall region. The second region has a spacing, measured parallel to the cylinder longitudinal axis, to the partition plane. The spacing is greater than the spacing in the first region. | 03-10-2016 |
| 20160097344 | Air Leading-Type Stratified Scavenging Two-Stroke Internal-Combustion Engine - The efficiency of charging air to a scavenging channel is enhanced by generating a gas flow in a piston groove simultaneously with the piston groove coming into communication with an air port. A piston groove | 04-07-2016 |
| 20090095269 | Two-Cycle Engine - In a stratified scavenging two-cycle engine | 04-16-2009 |
| 20100037877 | TWO CYCLE ENGINE AND TWO CYCLE ENGINE TOOL - The invention provides a two cycle engine which effectively suppresses an intrusion of a combustion gas into a crank chamber. Further, the invention provides a two cycle engine tool provided with the two cycle engine mentioned above. An engine is provided with a cylinder having two scavenge air ports at different positions in a cylinder circumference direction, and scavenge air inflow ports communicating individually with these two scavenge air ports via a scavenge air passage, and a piston in which two scavenge air communication ports are formed at positions corresponding to the scavenge air inflow ports, and is structured to swirl the gas flowing into the piston from the cylinder through the scavenge air passage, in an upper portion of the internal space of the piston, and retains the gas in the upper portion of the internal space of the piston. | 02-18-2010 |
| 20110180054 | Two-Stroke Internal Combustion Engine and Its Scavenging Method - In a two-stroke internal combustion engine using air for scavenging its combustion chamber ( | 07-28-2011 |
| 20120024275 | TWO-STROKE INTERNAL COMBUSTION ENGINE - A two stroke crank case scavenged two-stroke internal combustion engine, the engine including: a cylinder ( | 02-02-2012 |
| 20130255652 | INTERNAL COMBUSTION ENGINE, IN PARTICULAR TWO-STROKE INTERNAL COMBUSTION ENGINE - To create an internal combustion engine including a crankcase and a cylinder, wherein a piston is guided in the cylinder to perform a stroke movement and movably defines a combustion chamber, and wherein at least one transfer channel, through which ignition mixture is guided from the crankcase into the combustion chamber, is arranged in the cylinder, which leads to a further improvement of the exhaust gas quality and/or of the fuel consumption, in particular for creating an improved metering of ignition mixture into the fuel chamber, it is proposed for the piston to encompass a lower piston edge, which interacts with at least one counter body such that an inlet cross section of the transfer channel for the inflow of the ignition mixture from the crankcase into the transfer channel can be controlled by the stroke movement of the piston by the lower piston edge. | 10-03-2013 |
| 20150337765 | Stratified Scavenging Two-Stroke Internal Combustion Engine And Carburetor Thereof - A carburetor achieves better emission characteristics while improving a combustion state by increasing a delivery ratio of a stratified scavenging engine and reducing intake resistance. No dividing wall is provided between a throttle valve | 11-26-2015 |
| 20150377117 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A stratified scavenging two-stroke engine includes a first scavenging passage that extends from a first scavenging intake that opens to the inside of the crankcase to a scavenging port that opens to the inside of a cylinder, and a second scavenging passage that branches from the first scavenging passage and extends to a second scavenging intake that opens to the inside of the crankcase. An air passage is provided to supply air for pre-scavenging into the first scavenging passage at a position closer to the first scavenging intake than a position at which the second scavenging passage branches from the first scavenging passage. A first check valve inhibits a flow of air from the first scavenging passage during an upward stroke of the piston, and a second check valve inhibits a flow of air and a gaseous mixture from the first scavenging passage during a downward stroke of the piston. | 12-31-2015 |
| 20160169087 | Air Leading Type Two-Stroke Engine And Intake System For Same, And Carburetor | 06-16-2016 |
| 20160376979 | Stratified Scavenging Two-Stroke Internal Combustion Engine, Air Cleaner Of The Same, And Intake Method - An amplitude of a pressure fluctuation in a vicinity of a main nozzle of a carburetor ( | 12-29-2016 |
| 20080308084 | CYLINDER/CRANKCASE GROUP FOR TWO-STROKE INTERNAL COMBUSTION ENGINES PROVIDED WITH MEANS FOR SUPERCHARGING THE ENGINE - A fuel injection system for a two-stroke internal combustion engine ( | 12-18-2008 |
| 20160252011 | TWO-CYCLE GAS ENGINE | 09-01-2016 |
| 20090283081 | AIR INTAKE PORTING FOR A TWO STROKE ENGINE - A two stroke engine of a particular configuration can have its power output increased by running bigger pistons and using ports in the piston skirt through which to conduct compressed air within the skirt through short passages in the cylinder housing that conduct the air from within the skirt to above the piston. As a result a larger piston can be used for the same spacing and opening size in the block to save the need to redesign the block and the crankshaft. A position adjuster for the piston moves it axially without rotation of the piston ports out of alignment with inlet ports in the housing. The piston rod is held in the crosshead using a flat to prevent rotation while an adjuster nut that is turned creates axial movement in the piston rod with a lock nut securing the final piston position. | 11-19-2009 |
| 20120097141 | TWO-STROKE ENGINE WITH A COMPRESSED-AIR-ASSISTED FUEL-INJECTION SYSTEM - A two-stroke internal combustion engine is provided and includes a casing, a cylinder, a piston skirt, an aspirating port, a carburetor which supplies the casing with an air/fuel mixture, through said aspirating port, a transfer conduit which opens into the cylinder through an air/fuel inlet port, and a fuel storage system, or resonance tube which communicates with a first port located above the aspirating port, and with a second port located below the aspirating port. The first port and the second port are alternatingly opened by the piston skirt, which includes a through-hole having a diameter between 0.5 and 3.0 mm. The through-hole being located, when the piston is mounted in the engine, in a same radial plane as the second port. | 04-26-2012 |
| 20120318250 | TWO-STROKE ENGINE - The two-stroke engine has a plurality of intake passages extending from the external air inlet port through the crankcase, separating the intake air charge from the air and oil vapor within the crankcase. The piston has one or more corresponding inlet tubes depending therefrom that telescope within the crankcase intake passages as the piston reciprocates. All intake air travels through these passages and is separated from the remainder of the crankcase volume. The incoming air charge passes through a concentric poppet valve in the piston crown to enter the combustion chamber. Fuel is provided by conventional direct or port injection and ignition is provided by one or more conventional spark plugs. Diesel operation is achievable when the engine is configured appropriately. Exhaust exits the combustion chamber through a poppet valve in the cylinder head, the poppet valve being actuated by a rocker arm and pushrod from a crankshaft driven cam. | 12-20-2012 |
| 20140331981 | AIR INTAKE PORTING FOR A TWO STROKE ENGINE - A two stroke engine of a particular configuration can have its power output increased by running bigger pistons and using ports in the piston skirt through which to conduct compressed air within the skirt through short passages in the cylinder housing that conduct the air from within the skirt to above the piston. As a result a larger piston can be used for the same spacing and opening size in the block to save the need to redesign the block and the crankshaft. A position adjuster for the piston moves it axially without rotation of the piston ports out of alignment with inlet ports in the housing. The piston rod is held in the crosshead using a flat to prevent rotation while an adjuster nut that is turned creates axial movement in the piston rod with a lock nut securing the final piston position. | 11-13-2014 |
| 20150345372 | ASYMMETRIC TRANSFER AND INTAKE IN TWO-STROKES - With shaped connecting rod, piston and cylinder, an advantageous asymmetric timing of the two-stroke engine is achieved, wherein the combustion chamber communicates with the crankcase through a transfer port controlled by the piston and through a respective piston port controlled by the connecting rod, with the transfer port and its respective piston port arranged “in series”, and wherein an intake port communicates with the crankcase through a piston port controlled by the connecting rod, with the intake port and its respective piston port arranged “in series”. | 12-03-2015 |
| 20090007894 | Two-Cycle Engine - A stratified scavenging two-cycle engine includes: an air passage for delivering pure air to a scavenging passage; an air valve for opening and closing the air passage; and an auxiliary air passage for delivering the pare air to the scavenging passage when the air valve is completely closed. An amount of air for air-fuel mixture sucked in a crank chamber is reduced to increase the concentration of the air-fuel mixture, and air that supplements the reduced amount of the air for air-fuel mixture is fed into the scavenging passage through the auxiliary air passage, which enables the engine to be smoothly accelerated even when being suddenly accelerated from an idling state with an appropriate concentration of the air-fuel mixture sucked in a cylinder chamber during idling. | 01-08-2009 |
| 20110162630 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A two-stroke engine is provided with a piston, a cylinder that houses the piston in a manner allowing reciprocation, a crankshaft that is connected to the piston via a connecting rod, a crankcase that houses the crankshaft in a manner allowing rotation, a mixture gas passage that introduces mixture gas into the crankcase, a scavenging passage that extends between a scavenging intake that opens into the crankcase and a scavenging port that opens into the cylinder; and an air passage that is connected to an intermediate position of the scavenging passage for introducing air into the scavenging passage. The engine is adapted such that, in a part of an upward stroke period of the piston, the crankcase in which negative pressure is generated is connected to the scavenging passage via the scavenging port. Accordingly, most of air introduced into the scavenging passage form the air passage flows toward the scavenging port and into the cylinder without changing the direction of flow. | 07-07-2011 |
| 20120097142 | PRE-COMBUSTION CYCLE PRESSURISATION SYSTEM - A two stroke internal combustion engine ( | 04-26-2012 |
| 20130092137 | FIXING DEVICE FOR TWO-STROKE ENGINE - A two-stroke engine includes a cylinder, a combustion chamber formed in a cylinder running surface, and a cylinder head and with an outlet port of the combustion chamber. A transfer port is formed in the cylinder in order to connect the interior space of a crankcase of the two-stroke engine with the combustion chamber. The cylinder includes an axial bore, at least partially penetrating a wall of the outlet port and/or of the transfer port, so that the bore at least partially forms an opening at the wall side in the outlet port and/or in the transfer port. A pin is in the bore. The pin closes the opening at the wall side in such a way that the original surface of the wall of the outlet port and/or of the transfer port is substantially restored in the area of the opening at the wall side. | 04-18-2013 |
| 20130037010 | UNIFLOW PORT-LESS TWO-STROKE ENGINE - Uniflow two-stroke engines without ports on the cylinder and with four-stroke lubrication | 02-14-2013 |
| 20140251293 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A two-stroke engine is provided with a scavenging passage that extends between a scavenging intake that opens into a crankcase and a scavenging port that opens into a cylinder, and an air passage that is connected to an intermediate position of a scavenging passage for introducing air into the scavenging passage. A first check valve that is disposed within a section of a scavenging passage between a scavenging intake and the intermediate position. A second check valve that is disposed within the air passage. The section of the scavenging passage between the intermediate position and the scavenging intake, the air passage, and a mixture gas passage are arranged in a substantially same direction with respect to a longitudinal axis of the cylinder. | 09-11-2014 |
| 123073000 | Distinct passages from crankcase to cylinder | 25 |
| 20080302345 | A Crankcase Scavenged Two-Stroke Internal Combustion Engine Having an Additional Air Supply - A crankcase scavenged two-stroke internal combustion engine ( | 12-11-2008 |
| 20090056687 | Two-stroke, homogeneous charge, spark-ignition engine - A method for combusting fuel in an engine involving decreasing a first volume of air to a third volume, in two stages, the first stage in a crankcase compressor decreasing a first volume of air to a second volume and a second stage in the engine cylinder decreasing a second volume of a gas to a third volume, injection of fuel between the two stages into partially compressed hot air to provide homogenous charge to the cylinder to begin second stage compression in the cylinder having two variable compression ratios, a first variable compression ratio for low loads to reach a compression temperature slightly below the autoignition temperature of the homogeneous charge such that spark ignited HCCI-like combustion being emission free, a second much smaller variable compression ratio for preventing pre-ignition at high loads, then increasing the pressure at constant volume via combusting homogeneous charge in the cylinder, increasing the third volume of gas to a fourth volume (an expansion process having a chosen expansion ratio much greater than the compression ratio), decreasing the pressure to atmospheric pressure while removing heat under constant volume, and finally decreasing the volume of gas to the first volume while removing heat under constant pressure to complete a two-stroke homogeneous charge spark-ignition cycle. Also disclosed is an engine employing the two-stroke HCSI cycle. | 03-05-2009 |
| 20090308369 | Laminated Counterweight for Timing Control - A stratified two-stroke engine having a laminated counterweight is disclosed. The laminated counterweight includes a traditional counterweight portion and a laminate portion. The laminate portion has an approximately circular peripheral shape and at least one notch. In operation, the notch may be used to time the opening and closing of a mixture port or a transfer port. | 12-17-2009 |
| 20100012106 | STRATIFIED SCAVENGING TWO-CYCLE ENGINE - Provided is a laminar-scavenging two-cycle engine, which can have a higher laminar-scavenging effect than that of the laminar-scavenging two-cycle engine of the prior art and which can expect drastically excellent effects on the stabilization of combustion and on the blow-by prevention. The laminar-scavenging two-cycle engine is characterized in that a scavenging passage ( | 01-21-2010 |
| 20100059030 | Stratified Scavenging Two-Cycle Engine - A stratified scavenging two-cycle engine that has a simpler structure than conventional stratified scavenging two-cycle engines and that has an excellent blow-by prevention effect etc. In an air intake stroke, lead air passes a lead-air port ( | 03-11-2010 |
| 20100139637 | TWO-STROKE ENGINE - An object is to provide a two-stroke engine achieving effective reduction of blow-by while implementing efficient gas exchange. In a two-stroke engine | 06-10-2010 |
| 20100170485 | TWO STROKE COMBUSTION ENGINE - The invention related to a two-stroke internal combustion engine ( | 07-08-2010 |
| 20100252011 | IDLE SPEED CONTROL FOR A HANDHELD POWER TOOL - Method for controlling fuel metering in a carburetor or a low pressure injection system of an internal combustion engine when the engine is operating at idle speed, the method includes the steps of:
| 10-07-2010 |
| 20100307469 | Method for operating a two-stroke engine - A two-stroke engine ( | 12-09-2010 |
| 20120145137 | TWO-CYCLE ENGINE - An engine includes a cylinder block, and a piston slidably mounted in a cylinder, with the cylinder block being formed with an exhaust passage leading to a combustion chamber through an exhaust port, a first scavenging port opened to an inner circumferential surface of the cylinder, a first communication passage formed from the first scavenging port in a radial direction of the cylinder, and a first scavenging passage formed with an opening on a bottom surface of the first communication passage, in which a side surface on a far side from the exhaust port forming the communication passage is formed towards the far side from the exhaust port in the combustion chamber, and the opening portion of the first scavenging passage and a landing portion formed in the periphery of the opening portion are formed at a bottom portion of the communication passage. | 06-14-2012 |
| 20120152217 | TWO-STROKE ENGINE - A two-stroke engine has a cylinder with a combustion chamber which is bounded by a piston which drives a crankshaft which rotates in a crankcase. The crankcase is connected to the combustion chamber via an overflow passage in the lower dead centre region of the piston. The two stroke engine has an intake passage. A carburetor forms a section of the intake passage. The intake passage is partially divided into an air passage, which supplies combustion air into an overflow passage, and a mixture passage which opens into the crankcase. A throttle valve mounted pivotably in the carburetor controls the combustion air quantity supplied to the air and mixture passages. An air-guiding element arranged on the passage wall of the air passage guides the combustion air passing between the throttle valve and passage wall in the idling position of the throttle valve in the direction of the mixture passage. | 06-21-2012 |
| 20120152218 | TWO-STROKE ENGINE - A two-stroke engine, comprising: a crankcase; a cylinder connected to said crankcase; a combustion chamber defined by a reciprocally mounted piston within said cylinder; a crankshaft mounted rotatably in said crankcase and drivingly connected with said piston; at least one overflow passage connecting the crankcase and the combustion chamber when the piston is positioned in the lower dead center region; a connecting stub attached to said cylinder which contains an intake passage that opens into the crankcase and supplies fuel and combustion air, said intake passage including therein an air-fuel mixture passage, wherein said connecting stub contains at least one section of the mixture passage; at least one fuel opening for supplying fuel into said mixture passage; and a guiding rib positioned within said connecting stub and oriented longitudinally in the mixture passage and protruding into the mixture passage. | 06-21-2012 |
| 20120304973 | Two-Stroke Engine - An engine has a cylinder wherein a reciprocating piston is mounted. The piston drives, via a connecting rod ( | 12-06-2012 |
| 20140238371 | Two-Stroke Internal Combustion Engine - The scavenging passage includes a wall surface that defines an orientation direction of a main scavenging gas flow spouting from the scavenging port to the cylinder chamber. In a boundary portion between the scavenging port and the scavenging passage, a wall surface located on an opposite side of the exhaust port is composed of an inclined surface inclined in a direction further away from the exhaust port than a wall surface of a deep portion of the scavenging passage. The scavenging port includes a rear wall surface located in a portion on the opposite side of the exhaust port. The rear wall surface continues to the inclined surface to extend in the direction away from the exhaust port and generates an incidental scavenging gas flow incidental to the main scavenging gas flow and higher in speed than the main scavenging gas flow. | 08-28-2014 |
| 20140318518 | OPPOSED PISTON INTERNAL COMBUSTION ENGINE WITH INVISCID LAYER SEALING - An opposed-piston engine that forms an inviscid layer between pistons and the respective cylinder walls. In an aspect, the opposed-piston engine utilizes a Scotch yoke assembly that includes rigidly connected opposed combustion pistons. In an aspect, the Scotch yoke assembly is configured to transfer power from the combustion pistons to a crankshaft assembly. In an aspect, the crankshaft assembly can be configured to have dual flywheels that are internal to the engine, and can be configured to assist with an exhaust system, a detonation system, and/or a lubrication system. | 10-30-2014 |
| 20160061097 | UNIFLOW SCAVENGING 2-CYCLE ENGINE - A uniflow scavenging 2-cycle engine includes a cylinder inside which a combustion chamber is formed; a piston which slides within the cylinder; a scavenge port which is provided on one end side in a stroke direction of the piston in the cylinder to suck an active gas into the combustion chamber in accordance with the sliding movement of the piston; and a fuel injection unit which has an injection port located on the outside of the cylinder, and injects the fuel gas into the active gas sucked into the scavenge port. | 03-03-2016 |
| 20080302344 | Internal combustion engine and method of operating the same - An internal combustion engine has a cylinder ( | 12-11-2008 |
| 20100288252 | Non-Polluting Two-Stroke Engine with Air-Cooled Piston - A two-stroke internal combustion engine has at least one cylinder having a bore diameter, a central axis, a cylinder wall, and an upper and a lower extremity, a piston slip-fit in the cylinder, the piston having an overall height and a top surface, an upper portion and a lower portion each of approximately the bore diameter, each of the upper and lower portions having at least one seal ring between the piston and the cylinder wall, and a central portion of significantly less than the bore diameter and a height at least one-half of the overall piston height, providing an annular space between the central piston portion and the cylinder wall, a crank mechanism coupled to the piston in a manner providing a repeating stroke of a specific stroke length in the direction of the central axis of the cylinder, the repeating stroke providing a varying volume V between the top of the cylinder and the top surface of the piston, one or more exhaust ports through the cylinder wall, each exhaust port having a first height in the direction of the cylinder axis, centered at a first dimension from the top of the cylinder, one or more intake ports through the cylinder wall, each intake port having a second height in the direction of the cylinder axis, centered at a second dimension from the top of the cylinder, and a forced-air mechanism providing air to the one or more intake ports, wherein for a significant portion of every stroke both the one or more exhaust ports and the one or more intake ports are open to the annular space between the central piston portion and the cylinder wall, allowing the air pump to force air from the one or more intake ports around the central piston portion to the one or more exhaust ports. | 11-18-2010 |
| 20100288253 | AIR INTAKE PORTING FOR A TWO STROKE ENGINE - A two stroke engine of a particular configuration can have its power output increased by running bigger pistons and using ports in the piston skirt through which to conduct compressed air within the skirt through short passages in the cylinder housing that conduct the air from within the skirt to above the piston. As a result a larger piston can be used for the same spacing and opening size in the block to save the need to redesign the block and the crankshaft. A position adjuster for the piston moves it axially without rotation of the piston ports out of alignment with inlet ports in the housing. The piston rod is held in the crosshead using a flat to prevent rotation while an adjuster nut that is turned creates axial movement in the piston rod with a lock nut securing the final piston position. | 11-18-2010 |
| 20110017182 | TWO-STROKE INTERNAL COMBUSTION ENGINE - There is provided a loop-scavenged two-stroke internal combustion engine that is capable of effectively suppressing the short-circuiting of fresh charge (unburnt air-fuel mixture), while at the same time being capable of further improving scavenging efficiency, combustion efficiency, etc., as well as of improving the durability and output stability of a cylinder and a piston. One pair or a plurality of pairs of scavenging passages ( | 01-27-2011 |
| 20110017183 | TWO-STROKE INTERNAL COMBUSTION ENGINE - There is provided a reverse scavenged two-stroke internal combustion engine that is capable of effectively suppressing the short-circuiting of fresh charge (unburnt air-fuel mixture), while at the same time being capable of further improving scavenging efficiency, combustion efficiency, etc. The horizontal sectional shape of at least one pair of scavenging passages ( | 01-27-2011 |
| 20110079206 | TWO-STROKE ENGINE - In a two-stroke engine ( | 04-07-2011 |
| 20110146642 | Two-Stroke Engine, Sand Core for Producing a Two-Stroke Engine, and Method for Operating a Two-Stroke Engine - A two-stroke engine has a cylinder with a combustion chamber and a reciprocating piston for driving a crankshaft. Transfer passages connect the crankcase in at least one position of the piston with the combustion chamber and open by piston-controlled transfer ports into the combustion chamber. An inlet opens into the crankcase and an outlet is provided at the combustion chamber. The engine is dividable into four sectors parallel to a longitudinal cylinder axis. The transfer port of a first transfer passage is arranged in the first sector, the outlet is arranged in the second sector, the transfer port of a second transfer passage is provided in the third sector, and the inlet is arranged in the fourth sector. Within the cylinder the first and second transfer passages, at a spacing from a separation plane between cylinder and crankcase, pass together into one of the second and fourth sectors. | 06-23-2011 |
| 20110146643 | Two-Stroke Engine - A two-stroke engine has a cylinder with a combustion chamber and a piston reciprocatingly supported in the cylinder. A crankshaft is rotatably supported in a crankcase and driven by the piston. At least one transfer passage connects the crankcase in at least one position of the piston with the combustion chamber and has a piston-controlled transfer port that opens into the combustion chamber and an opening that opens into the crankcase. A mixture inlet opens into the crankcase. An outlet is provided at the combustion chamber. The transfer port and the opening are displaced relative to each other in a circumferential direction of the cylinder. At least one wall section of the transfer passage forms an undercut when viewed from the crankcase in a direction of a longitudinal cylinder axis of the cylinder and is delimited by a separate component inserted into the cylinder from a side facing the crankcase. | 06-23-2011 |
| 20110197868 | Two-stroke engine - A two-stroke engine ( | 08-18-2011 |
| 20110247601 | TWO-CYCLE ENGINE AND LOW EMISSION CONTROL SYSTEM - A two-cycle engine including exhaust, air inlet, scavenging and air/fuel intake windows disposed in the cylinder wall, a reciprocating piston driving a crankshaft, and curved gas-conveying channels connecting the crankcase chamber with the cylinder bore, the channels being opened by the reciprocating piston and the channels producing centrifugation of gases circulating therein to produce lean and rich components of an air/fuel mixture, wherein the lean component is circulated in a region of the combustion chamber remote from the exhaust window for promoting reduced combustion residues. | 10-13-2011 |
| 20110308507 | TWO-STROKE CYCLE COMBUSTION ENGINE OF AIR SCAVENGING TYPE - A two-stroke cycle combustion engine of an air scavenging type includes one or more scavenging passages ( | 12-22-2011 |
| 20120006308 | Piston for a Two-Stroke Engine - A transfer passage design for a two stroke internal combustion engine that allows for regulation of the air/fuel flow as the piston nears the bottom of its stroke. Additionally, a cut out in the skirt of the piston may allow for additional gaseous communication between the crankcase chamber and the transfer passage. | 01-12-2012 |
| 20120024276 | LOOP SCAVENGED TWO-STROKE INTERNAL COMBUSTION ENGINE - A loop scavenged two-stroke internal combustion engine which can effectively restrain blow-by of fresh gas with a relatively simple configuration is provided. A horizontal scavenging angle θb in at least one spot of a scavenging passage | 02-02-2012 |
| 20120060806 | Two-Stroke Engine - A two-stroke engine has a cylinder having a cylinder bore with a combustion chamber and an outlet connected with the combustion chamber. A piston is disposed in the cylinder and delimits the combustion chamber. The piston has a piston recess. A crankcase is provided that has a crankshaft rotatably supported therein. The piston drives in rotation the crankshaft. In at least one position of the piston, the crankcase is connected by a transfer passage with the combustion chamber. An air passage is provided as well as a mixture passage that has a mixture inlet that is disposed at the cylinder bore and opens into the cylinder bore and is piston-controlled. The transfer passage is connected by the piston recess to the air passage when the piston is at top dead center. The piston recess has a connection to the mixture inlet in at least one position of the piston. | 03-15-2012 |
| 20120247442 | STRATIFIED TWO-STROKE ENGINE - Various embodiments include two-stroke stratified engines and dual passage carburetors for use with gaseous fuel and liquid fuels. A stratified air-head engine having a simpler intake manifold with a single air pipe for induction of air is included. | 10-04-2012 |
| 20120260900 | STRATIFIED SCAVENGING TWO-CYCLE ENGINE - A laminar-scavenging two-cycle engine which has a high laminar-scavenging effect, includes a scavenging passage having a crankcase side portion extending along a crankcase, and a cylinder side portion extending along a cylinder and having a length larger than the sum of the diameter and stroke of the cylinder. An ambient air introducing passage for introducing leading air into the scavenging passage is connected to an intermediate portion of the scavenging passage. A notch for opening a scavenging port to the side of the crankcase when a piston is near the top dead center is formed in the piston. | 10-18-2012 |
| 20120325191 | SCAVENGING PASSAGE STRUCTURE FOR TWO-STROKE ENGINE - A scavenging passage structure for a two-stroke engine, having a scavenging passage communicating a scavenging port provided in a cylinder with a crank chamber formed inside a crankcase, the scavenging passage being formed to extend through respective fastening surfaces of the cylinder and the crankcase. The scavenging passage includes a cover member attached inside the crankcase to be in contact with an inner wall surface of the crankcase, and a groove formed in at least one of the inner wall surface of the crankcase contacting the cover member, and the cover member contacting the inner wall surface of the crankcase, the groove forming part of the scavenging passage connecting to the crank chamber and to an upper face of the crankcase. | 12-27-2012 |
| 20130037011 | Two-Stroke Internal Combustion Engine - It is intended to effectively prevent blow-by with no need for large changes in typical structures of two-cycle internal combustion engines. A main scavenging passage ( | 02-14-2013 |
| 20130061835 | Two-Stroke Engine and a Method for the Operation thereof - A two-stroke engine has a cylinder wherein a piston is journalled for reciprocating movement. The piston delimits a combustion chamber configured in the cylinder. The engine has an outlet from the combustion chamber and a transfer channel which opens at an inlet opening into the crankcase and at a transfer window in the combustion chamber. The piston drives a crankshaft via a connecting rod. The crankshaft is rotatably journalled in the crankcase. At least one control element for the inlet opening is connected to the crankshaft so as to rotate therewith. | 03-14-2013 |
| 20130068205 | TWO-STROKE ENGINE AND LUBRICATION - Various embodiments include a two-stroke engine and a carburetor for use with gaseous fuel, such as hydrogen, methane, liquid petroleum gas, pure propane, and butane. | 03-21-2013 |
| 20140060507 | ENGINE AND ENGINE-DRIVEN WORKING MACHINE - An engine and an engine-driven working machine which enable blow-though prevention of an uncombusted air-fuel mixture and control of the number of times of combustion, stabilize operation during idling, and ensure output and acceleration performance during working are provided. A two-cycle engine having: a piston; a crankcase in which scavenging passages are formed; and a cylinder in which scavenging ports communicated with the scavenging passages and an exhaust port for discharging a combustion gas are formed. In the two-cycle engine, at least two or more systems of the scavenging passages having mutually different opening/closing systems are formed in the crankcase. | 03-06-2014 |
| 20140182571 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A stratified scavenging two-stroke engine includes a first scavenging passage that extends from a first scavenging intake that opens to the inside of the crankcase to a first scavenging port that opens to the inside of a cylinder, and a second scavenging passage that extends from a second scavenging intake that opens to the inside of the crankcase to a second scavenging port that opens to the inside of the cylinder. The first and second passages are formed so as to communicate with each other via a communicating portion. An air passage is connected to the first passage at a position closer to the first scavenging intake than the communicating portion. A first check valve inhibits a flow from the first passage to the inside of the crankcase, and a second check valve inhibits a flow from the first passage through the air passage to the outside. | 07-03-2014 |
| 20140318517 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A stratified scavenging two-stroke engine includes: an intake passage that connects an intake opening through an outer surface of a cylinder member with an intake port opening to the inside of a cylinder, and supplies gaseous mixture of fuel and air; an exhaust passage that connects an exhaust outlet opening through the outer surface of the cylinder member with an exhaust port opening to the inside of the cylinder, and discharges combustion gas; a scavenging passage; and an air passage that connects an air inlet opening through the outer surface of the cylinder member with the scavenging passage and supplies pre-scavenging air into the scavenging passage. The intake and the air inlet are arranged at positions opposite from the exhaust port across the axis of the cylinder, and arranged side by side in a substantially circumferential direction of the cylinder or a direction substantially perpendicular to the axis of the cylinder. | 10-30-2014 |
| 20160069296 | TWO-STROKE ENGINE - A two-stroke engine has a cylinder with a combustion chamber formed therein. The combustion chamber is delimited by a piston. The cylinder has a base on which extends a partition plane whereat the cylinder is separated from a crankcase. The combustion chamber is, in at least one piston position, connected via at least one transfer channel to the crankcase interior. The transfer channel passes from the cylinder into the crankcase at at least one opening. A side wall of the transfer channel has, in the cylinder, a first region wherein the wall encloses an angle of 90° with the cylinder longitudinal axis. Between the first region and the opening as viewed in the cylinder circumferential direction is arranged a second wall region. The second region has a spacing, measured parallel to the cylinder longitudinal axis, to the partition plane. The spacing is greater than the spacing in the first region. | 03-10-2016 |
| 20160097344 | Air Leading-Type Stratified Scavenging Two-Stroke Internal-Combustion Engine - The efficiency of charging air to a scavenging channel is enhanced by generating a gas flow in a piston groove simultaneously with the piston groove coming into communication with an air port. A piston groove | 04-07-2016 |
| 20090095269 | Two-Cycle Engine - In a stratified scavenging two-cycle engine | 04-16-2009 |
| 20100037877 | TWO CYCLE ENGINE AND TWO CYCLE ENGINE TOOL - The invention provides a two cycle engine which effectively suppresses an intrusion of a combustion gas into a crank chamber. Further, the invention provides a two cycle engine tool provided with the two cycle engine mentioned above. An engine is provided with a cylinder having two scavenge air ports at different positions in a cylinder circumference direction, and scavenge air inflow ports communicating individually with these two scavenge air ports via a scavenge air passage, and a piston in which two scavenge air communication ports are formed at positions corresponding to the scavenge air inflow ports, and is structured to swirl the gas flowing into the piston from the cylinder through the scavenge air passage, in an upper portion of the internal space of the piston, and retains the gas in the upper portion of the internal space of the piston. | 02-18-2010 |
| 20110180054 | Two-Stroke Internal Combustion Engine and Its Scavenging Method - In a two-stroke internal combustion engine using air for scavenging its combustion chamber ( | 07-28-2011 |
| 20120024275 | TWO-STROKE INTERNAL COMBUSTION ENGINE - A two stroke crank case scavenged two-stroke internal combustion engine, the engine including: a cylinder ( | 02-02-2012 |
| 20130255652 | INTERNAL COMBUSTION ENGINE, IN PARTICULAR TWO-STROKE INTERNAL COMBUSTION ENGINE - To create an internal combustion engine including a crankcase and a cylinder, wherein a piston is guided in the cylinder to perform a stroke movement and movably defines a combustion chamber, and wherein at least one transfer channel, through which ignition mixture is guided from the crankcase into the combustion chamber, is arranged in the cylinder, which leads to a further improvement of the exhaust gas quality and/or of the fuel consumption, in particular for creating an improved metering of ignition mixture into the fuel chamber, it is proposed for the piston to encompass a lower piston edge, which interacts with at least one counter body such that an inlet cross section of the transfer channel for the inflow of the ignition mixture from the crankcase into the transfer channel can be controlled by the stroke movement of the piston by the lower piston edge. | 10-03-2013 |
| 20150337765 | Stratified Scavenging Two-Stroke Internal Combustion Engine And Carburetor Thereof - A carburetor achieves better emission characteristics while improving a combustion state by increasing a delivery ratio of a stratified scavenging engine and reducing intake resistance. No dividing wall is provided between a throttle valve | 11-26-2015 |
| 20150377117 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A stratified scavenging two-stroke engine includes a first scavenging passage that extends from a first scavenging intake that opens to the inside of the crankcase to a scavenging port that opens to the inside of a cylinder, and a second scavenging passage that branches from the first scavenging passage and extends to a second scavenging intake that opens to the inside of the crankcase. An air passage is provided to supply air for pre-scavenging into the first scavenging passage at a position closer to the first scavenging intake than a position at which the second scavenging passage branches from the first scavenging passage. A first check valve inhibits a flow of air from the first scavenging passage during an upward stroke of the piston, and a second check valve inhibits a flow of air and a gaseous mixture from the first scavenging passage during a downward stroke of the piston. | 12-31-2015 |
| 20160169087 | Air Leading Type Two-Stroke Engine And Intake System For Same, And Carburetor | 06-16-2016 |
| 20160376979 | Stratified Scavenging Two-Stroke Internal Combustion Engine, Air Cleaner Of The Same, And Intake Method - An amplitude of a pressure fluctuation in a vicinity of a main nozzle of a carburetor ( | 12-29-2016 |
| 20080308084 | CYLINDER/CRANKCASE GROUP FOR TWO-STROKE INTERNAL COMBUSTION ENGINES PROVIDED WITH MEANS FOR SUPERCHARGING THE ENGINE - A fuel injection system for a two-stroke internal combustion engine ( | 12-18-2008 |
| 20160252011 | TWO-CYCLE GAS ENGINE | 09-01-2016 |
| 20090283081 | AIR INTAKE PORTING FOR A TWO STROKE ENGINE - A two stroke engine of a particular configuration can have its power output increased by running bigger pistons and using ports in the piston skirt through which to conduct compressed air within the skirt through short passages in the cylinder housing that conduct the air from within the skirt to above the piston. As a result a larger piston can be used for the same spacing and opening size in the block to save the need to redesign the block and the crankshaft. A position adjuster for the piston moves it axially without rotation of the piston ports out of alignment with inlet ports in the housing. The piston rod is held in the crosshead using a flat to prevent rotation while an adjuster nut that is turned creates axial movement in the piston rod with a lock nut securing the final piston position. | 11-19-2009 |
| 20120097141 | TWO-STROKE ENGINE WITH A COMPRESSED-AIR-ASSISTED FUEL-INJECTION SYSTEM - A two-stroke internal combustion engine is provided and includes a casing, a cylinder, a piston skirt, an aspirating port, a carburetor which supplies the casing with an air/fuel mixture, through said aspirating port, a transfer conduit which opens into the cylinder through an air/fuel inlet port, and a fuel storage system, or resonance tube which communicates with a first port located above the aspirating port, and with a second port located below the aspirating port. The first port and the second port are alternatingly opened by the piston skirt, which includes a through-hole having a diameter between 0.5 and 3.0 mm. The through-hole being located, when the piston is mounted in the engine, in a same radial plane as the second port. | 04-26-2012 |
| 20120318250 | TWO-STROKE ENGINE - The two-stroke engine has a plurality of intake passages extending from the external air inlet port through the crankcase, separating the intake air charge from the air and oil vapor within the crankcase. The piston has one or more corresponding inlet tubes depending therefrom that telescope within the crankcase intake passages as the piston reciprocates. All intake air travels through these passages and is separated from the remainder of the crankcase volume. The incoming air charge passes through a concentric poppet valve in the piston crown to enter the combustion chamber. Fuel is provided by conventional direct or port injection and ignition is provided by one or more conventional spark plugs. Diesel operation is achievable when the engine is configured appropriately. Exhaust exits the combustion chamber through a poppet valve in the cylinder head, the poppet valve being actuated by a rocker arm and pushrod from a crankshaft driven cam. | 12-20-2012 |
| 20140331981 | AIR INTAKE PORTING FOR A TWO STROKE ENGINE - A two stroke engine of a particular configuration can have its power output increased by running bigger pistons and using ports in the piston skirt through which to conduct compressed air within the skirt through short passages in the cylinder housing that conduct the air from within the skirt to above the piston. As a result a larger piston can be used for the same spacing and opening size in the block to save the need to redesign the block and the crankshaft. A position adjuster for the piston moves it axially without rotation of the piston ports out of alignment with inlet ports in the housing. The piston rod is held in the crosshead using a flat to prevent rotation while an adjuster nut that is turned creates axial movement in the piston rod with a lock nut securing the final piston position. | 11-13-2014 |
| 20150345372 | ASYMMETRIC TRANSFER AND INTAKE IN TWO-STROKES - With shaped connecting rod, piston and cylinder, an advantageous asymmetric timing of the two-stroke engine is achieved, wherein the combustion chamber communicates with the crankcase through a transfer port controlled by the piston and through a respective piston port controlled by the connecting rod, with the transfer port and its respective piston port arranged “in series”, and wherein an intake port communicates with the crankcase through a piston port controlled by the connecting rod, with the intake port and its respective piston port arranged “in series”. | 12-03-2015 |
| 20090007894 | Two-Cycle Engine - A stratified scavenging two-cycle engine includes: an air passage for delivering pure air to a scavenging passage; an air valve for opening and closing the air passage; and an auxiliary air passage for delivering the pare air to the scavenging passage when the air valve is completely closed. An amount of air for air-fuel mixture sucked in a crank chamber is reduced to increase the concentration of the air-fuel mixture, and air that supplements the reduced amount of the air for air-fuel mixture is fed into the scavenging passage through the auxiliary air passage, which enables the engine to be smoothly accelerated even when being suddenly accelerated from an idling state with an appropriate concentration of the air-fuel mixture sucked in a cylinder chamber during idling. | 01-08-2009 |
| 20110162630 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A two-stroke engine is provided with a piston, a cylinder that houses the piston in a manner allowing reciprocation, a crankshaft that is connected to the piston via a connecting rod, a crankcase that houses the crankshaft in a manner allowing rotation, a mixture gas passage that introduces mixture gas into the crankcase, a scavenging passage that extends between a scavenging intake that opens into the crankcase and a scavenging port that opens into the cylinder; and an air passage that is connected to an intermediate position of the scavenging passage for introducing air into the scavenging passage. The engine is adapted such that, in a part of an upward stroke period of the piston, the crankcase in which negative pressure is generated is connected to the scavenging passage via the scavenging port. Accordingly, most of air introduced into the scavenging passage form the air passage flows toward the scavenging port and into the cylinder without changing the direction of flow. | 07-07-2011 |
| 20120097142 | PRE-COMBUSTION CYCLE PRESSURISATION SYSTEM - A two stroke internal combustion engine ( | 04-26-2012 |
| 20130092137 | FIXING DEVICE FOR TWO-STROKE ENGINE - A two-stroke engine includes a cylinder, a combustion chamber formed in a cylinder running surface, and a cylinder head and with an outlet port of the combustion chamber. A transfer port is formed in the cylinder in order to connect the interior space of a crankcase of the two-stroke engine with the combustion chamber. The cylinder includes an axial bore, at least partially penetrating a wall of the outlet port and/or of the transfer port, so that the bore at least partially forms an opening at the wall side in the outlet port and/or in the transfer port. A pin is in the bore. The pin closes the opening at the wall side in such a way that the original surface of the wall of the outlet port and/or of the transfer port is substantially restored in the area of the opening at the wall side. | 04-18-2013 |
| 20130037010 | UNIFLOW PORT-LESS TWO-STROKE ENGINE - Uniflow two-stroke engines without ports on the cylinder and with four-stroke lubrication | 02-14-2013 |
| 20140251293 | STRATIFIED SCAVENGING TWO-STROKE ENGINE - A two-stroke engine is provided with a scavenging passage that extends between a scavenging intake that opens into a crankcase and a scavenging port that opens into a cylinder, and an air passage that is connected to an intermediate position of a scavenging passage for introducing air into the scavenging passage. A first check valve that is disposed within a section of a scavenging passage between a scavenging intake and the intermediate position. A second check valve that is disposed within the air passage. The section of the scavenging passage between the intermediate position and the scavenging intake, the air passage, and a mixture gas passage are arranged in a substantially same direction with respect to a longitudinal axis of the cylinder. | 09-11-2014 |
| 123074000 | Cylinder | 3 |
| 20150007802 | TWO-STROKE ENGINE - There is provided a two-stroke engine configured to effectively prevent blow-by of the scavenging air from the discharge port and to be able to improve the engine output while abating pollution. The two-stroke engine includes a cylinder having an exhaust port and a scavenging port, and a piston, wherein: the piston has a top surface; a piston concave portion is provided in the top surface in the discharge direction; an entire surface of the piston concave portion is formed in an approximately spherical shape; and a slope of the piston concave portion extending from an outer circumferential edge of the piston concave portion in the discharge direction to a deepest portion is steeper than a slope of the piston concave portion extending from an outer circumferential edge of the piston concave portion in the anti-discharge direction to the deepest portion. | 01-08-2015 |
| 20160177816 | TWO-STROKE ENGINE | 06-23-2016 |
| 20160061098 | UNIFLOW SCAVENGING 2-CYCLE ENGINE - A uniflow scavenging 2-cycle engine includes a cylinder inside in which a combustion chamber is formed; a piston which slides within the cylinder; a scavenge port which is provided on one end side in a stroke direction of the piston in the cylinder to suck an active gas into the combustion chamber in accordance with the sliding movement of the piston; and an injection unit which injects a fuel gas into the active gas suctioned to the scavenge port and is provided on an inner circumferential surface of the scavenge port or on the outside of the cylinder rather than the inner circumferential surface. Further, the amount of the fuel gas injected by the injection unit on the other end side in the stroke direction is larger than the amount of fuel gas injected by the injection unit on one end side in the stroke direction. | 03-03-2016 |
| 123074000 | Fuel to rear of piston | 1 |
| 20150007802 | TWO-STROKE ENGINE - There is provided a two-stroke engine configured to effectively prevent blow-by of the scavenging air from the discharge port and to be able to improve the engine output while abating pollution. The two-stroke engine includes a cylinder having an exhaust port and a scavenging port, and a piston, wherein: the piston has a top surface; a piston concave portion is provided in the top surface in the discharge direction; an entire surface of the piston concave portion is formed in an approximately spherical shape; and a slope of the piston concave portion extending from an outer circumferential edge of the piston concave portion in the discharge direction to a deepest portion is steeper than a slope of the piston concave portion extending from an outer circumferential edge of the piston concave portion in the anti-discharge direction to the deepest portion. | 01-08-2015 |
| 20160177816 | TWO-STROKE ENGINE | 06-23-2016 |
| 20160061098 | UNIFLOW SCAVENGING 2-CYCLE ENGINE - A uniflow scavenging 2-cycle engine includes a cylinder inside in which a combustion chamber is formed; a piston which slides within the cylinder; a scavenge port which is provided on one end side in a stroke direction of the piston in the cylinder to suck an active gas into the combustion chamber in accordance with the sliding movement of the piston; and an injection unit which injects a fuel gas into the active gas suctioned to the scavenge port and is provided on an inner circumferential surface of the scavenge port or on the outside of the cylinder rather than the inner circumferential surface. Further, the amount of the fuel gas injected by the injection unit on the other end side in the stroke direction is larger than the amount of fuel gas injected by the injection unit on one end side in the stroke direction. | 03-03-2016 |
| 123074000 | Lengthwise scavenging from head | 1 |
| 20150007802 | TWO-STROKE ENGINE - There is provided a two-stroke engine configured to effectively prevent blow-by of the scavenging air from the discharge port and to be able to improve the engine output while abating pollution. The two-stroke engine includes a cylinder having an exhaust port and a scavenging port, and a piston, wherein: the piston has a top surface; a piston concave portion is provided in the top surface in the discharge direction; an entire surface of the piston concave portion is formed in an approximately spherical shape; and a slope of the piston concave portion extending from an outer circumferential edge of the piston concave portion in the discharge direction to a deepest portion is steeper than a slope of the piston concave portion extending from an outer circumferential edge of the piston concave portion in the anti-discharge direction to the deepest portion. | 01-08-2015 |
| 20160177816 | TWO-STROKE ENGINE | 06-23-2016 |
| 20160061098 | UNIFLOW SCAVENGING 2-CYCLE ENGINE - A uniflow scavenging 2-cycle engine includes a cylinder inside in which a combustion chamber is formed; a piston which slides within the cylinder; a scavenge port which is provided on one end side in a stroke direction of the piston in the cylinder to suck an active gas into the combustion chamber in accordance with the sliding movement of the piston; and an injection unit which injects a fuel gas into the active gas suctioned to the scavenge port and is provided on an inner circumferential surface of the scavenge port or on the outside of the cylinder rather than the inner circumferential surface. Further, the amount of the fuel gas injected by the injection unit on the other end side in the stroke direction is larger than the amount of fuel gas injected by the injection unit on one end side in the stroke direction. | 03-03-2016 |
| 123074000 | Reduced portion of piston acts as guide | 1 |
| 20150007802 | TWO-STROKE ENGINE - There is provided a two-stroke engine configured to effectively prevent blow-by of the scavenging air from the discharge port and to be able to improve the engine output while abating pollution. The two-stroke engine includes a cylinder having an exhaust port and a scavenging port, and a piston, wherein: the piston has a top surface; a piston concave portion is provided in the top surface in the discharge direction; an entire surface of the piston concave portion is formed in an approximately spherical shape; and a slope of the piston concave portion extending from an outer circumferential edge of the piston concave portion in the discharge direction to a deepest portion is steeper than a slope of the piston concave portion extending from an outer circumferential edge of the piston concave portion in the anti-discharge direction to the deepest portion. | 01-08-2015 |
| 20160177816 | TWO-STROKE ENGINE | 06-23-2016 |
| 20160061098 | UNIFLOW SCAVENGING 2-CYCLE ENGINE - A uniflow scavenging 2-cycle engine includes a cylinder inside in which a combustion chamber is formed; a piston which slides within the cylinder; a scavenge port which is provided on one end side in a stroke direction of the piston in the cylinder to suck an active gas into the combustion chamber in accordance with the sliding movement of the piston; and an injection unit which injects a fuel gas into the active gas suctioned to the scavenge port and is provided on an inner circumferential surface of the scavenge port or on the outside of the cylinder rather than the inner circumferential surface. Further, the amount of the fuel gas injected by the injection unit on the other end side in the stroke direction is larger than the amount of fuel gas injected by the injection unit on one end side in the stroke direction. | 03-03-2016 |
