Class / Patent application number | Description | Number of patent applications / Date published |
181247000 | Straight-through passage | 53 |
20080271946 | Pipe/Silencer Device Assembly - Described herein is a pipe/silencer device assembly comprising a connection element, which has a through hole, having an axis, and a branching off hole, which is fluidically connected to the through hole wherein the assembly comprises: first connection means adapted for co-operating with a first duct; a second duct, fluidically connected to the connection element; and a blind silencer duct, fluidically connected to the branching off hole. | 11-06-2008 |
20090127024 | ACOUSTIC LOAD MITIGATOR - A system for reducing an acoustic load of a fluid flow includes a first pipe. The first pipe includes a first end and a second end and a first aperture and a second aperture, the first and second apertures being intermediate the first and second ends. A second pipe includes a first end and a second end and a third aperture intermediate the first and second ends. The second pipe is connected at its first end to the first pipe at the first aperture. A bypass pipe includes a first end connected to the second aperture of the first pipe and a second end connected to the third aperture of the second pipe. A method of reducing an acoustic load of a flow in a standpipe connected to a first pipe configured to carry a main flow includes providing a bypass flow from the first pipe to the standpipe. | 05-21-2009 |
20090194364 | MUFFLERS WITH POLYMERIC BODIES AND PROCESS FOR MANUFACTURING SAME - Mufflers having polymeric bodies that are protected from being overheated from the exhaust pipe by having an air gap between the exhaust pipe and the polymeric body are disclosed. Also disclosed is a process for making muffler systems wherein the muffler polymeric bodies have a cross section that is constant over the length of the muffler polymeric body. The muffler systems are inexpensive to make and install. | 08-06-2009 |
20110011670 | MUFFLING STRUCTURE OF VENT PIPE AND MUFFLING STRUCTURE OF CASE - The present invention aims to provide a muffling structure of a vent pipe and a muffling structure of a case, which is capable of muffling in a wide frequency range and preventing vent resistance in the air pipe or the case from deterioration. Vent holes ( | 01-20-2011 |
20140034413 | Acoustic Structure - An acoustic structure, including a pipe having a plurality of cavities that are partitioned by a partition, each of the plurality of cavities extending in a first direction that is a longitudinal direction of the pipe, wherein the pipe has at least one opening which permits the plurality of cavities to communicate with an exterior of the pipe, a position of each of the at least one opening in the first direction being a first position. | 02-06-2014 |
20150300525 | SOUND TREATMENT ASSEMBLY FOR A FLUID TRANSMISSION LINE - A sound treatment assembly includes an outlet member having a bore extending along a longitudinal axis, and a first flange portion is adapted to be coupled to portion of a valve body of a regulator valve. The first flange portion includes a contoured mating surface adapted to mate with a corresponding contoured portion of an exterior surface of the valve body. The outlet member also includes a second flange portion disposed at the second end. A diffuser assembly includes diffuser housing extending along the longitudinal axis, and a first flange portion is disposed at the first end of the diffuser housing and is adjacent to the second flange portion of the outlet member. One or more diffuser elements are disposed within an interior of the diffuser housing to reduce noise levels in the fluid exiting the outlet member. | 10-22-2015 |
181248000 | Continuous conduit | 15 |
20140326534 | NATURAL VACUUM LEAK DETECTION NOISE ATTENUATION DEVICE - A noise attenuation device for reducing resonance in a natural vacuum leak detector. The device includes a housing, a first connector connected to the housing, and a first fitting connected to the first connector. Also included is a second connector which is connected to the housing on an opposite end of the housing in relation to the first connector, and a second fitting connected to the second connector. A plurality of tubes is disposed within the housing between the first connector and the second connector such that air flows through the first fitting, the first connector, the plurality of tubes, through the second connector and the second fitting. A plurality of flow paths is created by the plurality of tubes, and the plurality of flow paths reduces the turbulence and the pulsation of air flow through the housing, reducing or eliminating resonance in the natural vacuum leak detector. | 11-06-2014 |
181249000 | With expansion chamber | 14 |
20080308346 | Muffler having fluid swirling vanes - A muffler for an internal combustion engine has a casing forming an expansion chamber therein. An inlet duct is connected to the casing and projects into the expansion chamber and discharges exhaust fluid into the expansion chamber. The casing tapers in an upstream direction to form a pocket for receiving reverse flow of the exhaust gases and to minimize reverse flow from flowing back into the inlet duct in an upstream direction. In the discharge end of the inlet duct are a set of primary vanes and a set of secondary vanes. The vanes are secured to the walls of the duct and extend radially toward the central area of the duct. The vanes are angled in order to deflect the exhaust fluid flow into a swirling movement as it is discharged into the expansion chamber and maintains that swirling movement while passing out of the casing through the outlet duct. | 12-18-2008 |
20090218164 | DOUBLE THROAT PULSATION DAMPENER FOR A COMPRESSOR - A method of attenuating fluid dynamic pulsations that propagate through a flow of fluid at a convective velocity of the fluid, the pulsations having an organized vortical structure includes directing the flow to a pulsation dampener inlet having a first area and transitioning the organized vortical structure to a small-scale turbulent structure by squeezing the vorticies by passing the flow of fluid through a passage having a second area that is smaller than the first area, then rapidly expanding the flow of fluid by passing it into a chamber having a third area measured at an inlet of the chamber that is substantially larger than the second area. The method also includes discharging the flow of fluid from the chamber. The flow of fluid includes substantially attenuated fluid dynamic pulsations and acoustic pulsations that travel through the flow of fluid at the speed of sound. | 09-03-2009 |
20090236174 | EXHAUST APPARATUS OF VEHICLE ENGINE - A substantially elliptic tubular muffler device mounted to a vehicle is provided. The muffler device is provided in such a manner that a center axis extends along a lateral direction of a vehicle. The muffler device is provided with an inlet portion introducing exhaust gas of an engine to the muffler device, and an outlet portion discharging the exhaust gas to the outside from the muffler device. The muffler device has a circumferential surface portion formed substantially in an elliptic tubular shape, and a pair of end plates provided in such a manner as to cover both end opening portions of the circumferential surface portion. The inlet portion is connected to one of a pair of end plates, and the outlet portion is connected to the circumferential surface portion. | 09-24-2009 |
20090272601 | EXHAUST DEVICE FOR STRADDLE-TYPE VEHICLE AND STRADDLE-TYPE VEHICLE - An exhaust device for a straddle type vehicle allowing a compact design while still satisfying the sound deadening characteristic requirements is provided. The exhaust device for a straddle type vehicle comprising: an exhaust pipe that is connected to an engine; a silencer that is connected to the exhaust pipe wherein the exhaust pipe is provided with a Helmholtz resonator, and the Helmholtz resonator is filled with a sound absorbing material. The Helmholtz resonator is formed with an opening that communicates with the inside of the exhaust pipe. The opening is formed in a place where the sound pressure in the exhaust pipe is high during the operation of the engine. | 11-05-2009 |
20110024228 | SILENCER PROVIDED ON EXHAUST PIPE OF VEHICLE ENGINE - A silencer includes an inner cylinder that is connected to an exhaust pipe and a partition cylinder that is accommodated in a housing and that sections an expansion chamber in the housing. A group of partition-cylinder small holes is formed in the partition cylinder, and a group of inner-cylinder small holes is formed in the inner cylinder. The group of partition-cylinder small holes and the group of inner-cylinder small holes do not overlap each other in an axial direction, and are separated from each other by a predetermined distance in the axial direction. | 02-03-2011 |
20120312630 | EXHAUST PIPE - An exhaust pipe including an inner tube for introducing exhaust gas, and an outer tube fitted on the inner tube. Projected portions obtained by radially inwardly projecting plural parts of the inner peripheral surface of the outer tube in the circumferential direction, and extending the same in the tube axis direction, are provided on the inner peripheral surface of the outer tube. A plurality of air chambers partitioned by the projected portions are formed between the outer peripheral surface of the inner tube and the inner peripheral surface of the outer tube, and an intermediate member is provided between the outer peripheral surface of the inner tube and the projected portions. In the exhaust pipe a sufficient noise reduction effect and a prevention effect for reduction of the temperature of an exhaust gas can be obtained even if the exhaust pipe is bent. | 12-13-2012 |
20160097315 | SILENCER - A silencer for a motor vehicle and in particular air intake or exhaust gas lines and/or HVAC air passageways is disclosed. The silencer includes a pipe arranged in a housing, which defines a duct and an annular orifice arrangement having a first annular orifice which extends from the pipe to the housing. The housing and pipe form a chamber arrangement with a first chamber and a second chamber, which are separated by the first annular orifice and communicate with the duct through apertures in the pipe. The housing is designed integrally with a first connector and the pipe integrally with a second connector, which communicate with the duct, and in particular merge into the duct. | 04-07-2016 |
20160252204 | Compact Modular Low Resistance Broadband Acoustic Silencer | 09-01-2016 |
181250000 | And side branch | 5 |
20090301807 | EXHAUST MUFFLER FOR EXHAUST SYSTEM - An exhaust muffler ( | 12-10-2009 |
20100212999 | HELMHOLTZ RESONATOR - The invention relates to a Helmholtz resonator ( | 08-26-2010 |
20110079463 | VARIABLE RESONATION CHAMBER VALVE - A variable resonation chamber valve includes an outer valve seat and a rotatable plunger. The outer valve seat defines an inlet opening into an associated resonation chamber. The rotatable plunger is movable into the inlet opening of the valve seat for varying a tuner area of the inlet opening. | 04-07-2011 |
20110088968 | SOUND ABSORBER FOR A PIPE-SHAPED, CAVITY-FORMING BODY - The present invention relates to a coolant circuit of a cooling system including a pipe-shaped body defining a cavity. It has a sound absorber defining a flow channel and at least one resonator chamber which is connected to the flow channel via a connection channel. The sound absorber is an insert in the cavity of the pipe-shaped body, which forms the flow channel, the at least one resonator chamber, and the at least one connection channel. | 04-21-2011 |
20160169070 | EXHAUST PIPE | 06-16-2016 |
181251000 | And multi-passage | 1 |
20080251314 | Exhaust System for an Engine and Motorcycle Including the Exhaust System - An exhaust system for an engine that reduces muffler weight, assures a silencing effect and prevents a leak of exhaust gas. A muffler has an inner cylinder disposed in an outer cylinder, and is separated into a plurality of expansion chambers. A communicative passage for communicatively connecting the expansion chambers together is formed between the outer and inner cylinders. Edge parts of the communicative passage contact the outer cylinder and are welded thereto. | 10-16-2008 |
181252000 | With sound absorbing material | 16 |
20090045006 | Noise Eliminator for Fuel Cell - A noise eliminator for a fuel cell installed in an exhaust system discharging exhaust gas from the fuel cell, comprising an inner pipe having a plurality of sound transmission holes formed in its peripheral wall and allowing the exhaust gases to flow therethrough and an outer shell disposed to surround the inner pipe through a prescribed distance from the peripheral wall and constituting a sound absorbing chamber with a sound absorbing material filled in the clearance thereof from the inner pipe. The sound transmission hole has an inner diameter of 3 mm or greater, and a depth of 1.2 mm or less. | 02-19-2009 |
20090078498 | SEAMLESS IN-LINE AIRBOAT MUFFLER - A muffler comprising a generally cylindrical in-line muffler having a seamless outer body for use in silencing airboat engines is disclosed. An inner perforated stainless steel inner tube is surrounded by a stainless steel mesh liner and a stainless steel outer body having opposing ends swaged to a reduced diameter. The use of all stainless steel components provides a muffler that is highly resistant to corrosion. In addition, the muffler is ideally suited for use in marine environments since it is capable of discharging ingested water as the stainless steel perforated inner tube and mesh liner will not become water logged. A method for fabricating mufflers in accordance with the present invention if further disclosed. | 03-26-2009 |
20090139796 | EXHAUST DEVICE FOR STRADDLE-TYPE VEHICLE AND STRADDLE-TYPE VEHICLE - An exhaust device for a straddle-type vehicle that satisfies the requirements of sound deadening characteristics and which has a reduced size is provided. The exhaust device for a straddle-type vehicle that includes an exhaust pipe connected to an engine and a silencer connected to the exhaust pipe. The silencer includes at least one resonator selected from a group consisting of a Helmholtz resonator and a side branch resonator. The resonator is packed with a sound absorbing material. | 06-04-2009 |
20090145688 | ACOUSTIC ATTENUATION DEVICE - An acoustic attenuation device including an elongated hollow body having an open upstream end taking the form of a head for coupling to a compressed air outlet, and a closed downstream end, the hollow body having a sidewall with a plurality of air exhaust openings arranged in the downstream part, where the hollow body contains at least one upstream buffer lining forming a longitudinal filter and at least one downstream filtering lining forming a sheath. | 06-11-2009 |
20090242324 | SUB-MUFFLER - Provided is a sub-muffler which needs no heat resistant material such as SUS, and which can keep its durability and sound absorbing performance even when the sub-muffler is exposed to various corrosive components in the exhaust gas. At the same time, accomplished is a low-cost manufacture, which is a challenge that sub-mufflers and sound absorbing materials commonly face. Disclosed is a sub-muffler in which a perforated exhaust pipe is arranged, and caps and an out pipe are arranged outside the perforated pipe. Sound absorbing materials are filled in the space between the perforated exhaust pipe, and the caps and the out pipe. The sub-muffler is characterized in that, among the sound absorbing materials, at least part of the sound absorbing material of the perforated pipe side is a basalt fiber for high temperature. | 10-01-2009 |
20100101890 | MUFFLER OF A EXHAUST SYSTEM - The present invention regards to a silencer for automobiles, architectural and other mechanical facilities, which is composed of following componentŝ the pipe-type body that is installed on the exhaust system of mechanical structure where its one end forms the inlet of exhaust gas and the other end of it forms the outlet for discharge of exhaust gas; the multiple noise absorption guides that are installed inside the body of the silencer consecutively at regular intervals in the direction from the inlet to outlet of the above body. The noise absorption guide has a hollow form, of which the inlet is situated to the inlet of the body and the outlet is to the outlet of the body. The circumference of the above outlet is combined with the inside surface of the body. The surface connecting the circumferences of above inlet and outlet is tilted to get farther from the inner surface of the body while it goes from the outlet to the inlet; and the screw element that was formed by twisting a plate, where the screw element passes through the inlet and the outlet of multiple noise absorption guides and is fixed on the inlet circumference of the above noise absorption guides inside the body. | 04-29-2010 |
20100213000 | VEHICULAR MUFFLER AND MOTORCYCLE INCORPORATING SAME - A vehicular muffler is configured and arranged to smoothly introduce exhaust gas into a sound-absorbing material disposed inside of an outer case which has a plurality of relatively short inner sleeves therein. The muffler includes a porous plate which is disposed inside of the outer case, and which is connected to an exhaust pipe, and the porous plate is operatively connected to an outlet pipe which discharges an exhaust gas to the outside environment through an opening formed in an outlet side of the outer case. In one embodiment, the inner sleeves are arranged substantially parallel to each other, and are fluidly connected to a joint exhaust feed pipe disposed inside the outer case. The inner sleeves are connected to the outlet pipe on the outlet side of the outer case. | 08-26-2010 |
20100252360 | ABSORPTIVE MUFFLER SUSPENSION - An absorptive muffler assembly includes a first body and a second body surrounding the first body. A resilient mount having at least one resilient portion and at least one support arm supports the first body and isolates the second body from vibrations of the first body. | 10-07-2010 |
20100307863 | COMPOSITE MUFFLER SYSTEM THERMOSETABLE POLYMERS - A muffler assembly includes a housing defining at least one internal chamber. The housing is constructed from a composite material made from a thermoplastic resin and a reinforcing element. The reinforcing element is selected from a group of reinforcing materials consisting of glass fibers, aramid fibers, polyamide fibers, carbon fibers, graphite fibers, mineral fibers, ceramic fibers, carbon nanotubes, nano fillers, mineral fillers, ceramic fillers and combinations thereof. A pipe is received in the housing. The pipe includes at least one opening providing acoustic communication between an internal passage in the pipe and the chamber in the housing. An acoustic attenuating material is received in that chamber. | 12-09-2010 |
20110005860 | EXHAUST COMPONENT WITH REDUCED PACK - A vehicle exhaust component provides comparable fully packed noise reduction capability without requiring a fully packed configuration. A pack is mounted within an internal cavity defined by an exhaust component body. A plurality of pack positions are defined within the internal cavity and at least one pack is positioned at a desired pack position to provide a desired noise reduction. | 01-13-2011 |
20110048849 | EXTERNAL CYLINDER AND SILENCER PROVIDED WITH THE EXTERNAL CYLINDER - A silencer capable of preventing a damage of a metallic layer formed on an inner surface of an external cylinder formed from CFRP, and the external cylinder for the silencer. The silencer | 03-03-2011 |
20110147118 | SILENCER/MUFFLER - In a muffler which includes an outer tube which configures an outer wall, an inner tube provided in the outer tube and having punching holes formed therein, and a sound absorbing material filled between the outer tube and the inner tube, and which is attached to an exhaust pipe for exhausting exhaust gas from an engine, the number of punching holes at portions of the inner tube which have a great length to the outer tube is set greater than the number of punching holes at portions of the inner tube which have a small length to the outer tube in comparison with the portions having the great length. | 06-23-2011 |
20120031698 | MOTORCYCLE - A silencer for a motorcycle has a front cup which has a tapered tubular shape, a center sleeve which is connected to the front cup, and a tail cup which is connected to the center sleeve. Since the front cup has a tapered tubular shape, the front cup is arranged such that a front end of the front cup is positioned in the vicinity of a main frame. A distal end of the silencer can be shifted frontward in the longitudinal direction of a vehicle compared to a silencer of a prior art. As a result, a length of the silencer can be increased while avoiding interference between the silencer and legs of a rider and hence, silencing performance of the silencer can be enhanced. Since the distal end of the silencer can be shifted frontward in the longitudinal direction of the vehicle, the concentration of a mass can be acquired. | 02-09-2012 |
20120055735 | Acoustic Attenuation Method Based on Acoustic Ray Deflection Theory and a Muffler - A noise elimination method based on sound ray refraction theory and the muffler thereby are disclosed. The method use s low temperature refrigeration system ( | 03-08-2012 |
20130092471 | Active Sound Absorbers - The present invention relates to an active sound absorber ( | 04-18-2013 |
20160201531 | NOISE ATTENUATING MEMBER FOR NOISE ATTENUATING UNITS IN ENGINES | 07-14-2016 |
181253000 | With muffler bypass | 10 |
20080308347 | VEHICULAR EXHAUST SYSTEM - A system and method for dissipating at least one pressure wave in an exhaust gas flow is disclosed. A vehicular exhaust system directs the exhaust gas flow through a plurality of coaxial and perforated generally cylindrical tubes contained within an insulated canister towards a perforated partition plate. Through a series of apertures in the tubes and plate, the at least one pressure wave is dissipated such that sound attenuation is achieved without output loss from the engine. | 12-18-2008 |
181254000 | Valve controlled | 9 |
20080245605 | METHOD AND APPARATUS FOR CONTROLLING ENGINE EXHAUST SOUND FOR VEHICLES - An exhaust sound controlling method including reducing a flow rate of exhaust gas that passes through an exhaust path, to a first flow rate in accordance with increase in engine speed in a first engine speed region, and increasing the flow rate of exhaust gas to a second flow rate in accordance with increase in engine speed in a second engine speed region higher in engine speed than the first engine speed region. An exhaust sound controlling apparatus including a baffle plate and a valve that is operated to open a communication passage that communicates upstream and downstream sides of the baffle plate in an engine starting region, close the communication passage in an idling region and a low engine speed region, and open the communication passage and increase an opening of the valve as the engine speed rises in a high engine speed region. | 10-09-2008 |
20080302598 | SILENCER - The invention relates to a silencer for an airborne sound conducting pipe system, including a housing enclosing an interior space, an inlet pipe having an outlet within the interior space, a bypass pipe branching off from inlet pipe within the housing and having an outlet, a control element actuated by the gas flow and arranged downstream of bypass pipe on or in the inlet pipe, and at least one outlet pipe having an inlet within the interior space. Furthermore, the interior space is acoustically unseparated in such a manner that the volume of the interior space loaded with the airborne sound is equal with opened and with closed control element. | 12-11-2008 |
20080308348 | Exhaust System for Internal Combustion Engines - A dynamic exhaust system including a down-pipe ( | 12-18-2008 |
20090229912 | MUFFLER - A muffler has a casing with a plurality of sound-muffling chambers, exhaust pipes that pass through at least two sound-muffling chambers and to pass through exhaust from an engine, a plurality of apertures provided in each exhaust pipe, and a plurality of valves provided in each of the apertures. In this muffler, the plurality of apertures are provided at the locations at which an exhaust flow from one aperture and an exhaust flow from another aperture do not interfere with each other. When there are two apertures, the apertures are provided at positions in the exhaust pipes at which the apertures do not face each other. For this reason, by avoiding interference between exhaust flows from the two apertures, it is possible to suppress an abnormal sound caused by the interference. | 09-17-2009 |
20090229913 | Dual Mode Exhaust Muffler - A dual mode exhaust muffler for the engine of a vehicle that may be shifted between a quiet mode and a loud mode. A single muffler, a dual transverse muffler with two independent exhaust flow streams, and a dual transverse muffler with a combined exhaust flow stream embodiments are disclosed. An inlet tube may be a solid wall tube to minimize sound attenuation in the loud mode. The dual transverse muffler embodiments utilize an exhaust flow path that passes out through a reticulated wall of one tube and passes into a reticulated wall of a second tube. A vacuum switch having a two position on/off slide actuator may be used with any of the muffler assemblies. | 09-17-2009 |
20100071992 | Muffler Assembly - The invention provides a muffler assembly ( | 03-25-2010 |
20100140014 | Flow Passage Control Valve for Muffler - A flow passage control valve for a muffler may include an opening formed through a guide pipe, which forms an exhaust gas channel in the muffler, to form another exhaust gas channel, and a valve body adjusts an open amount of the opening by using a difference between an exhaust gas pressure exerted through the opening and a weight of the valve body. | 06-10-2010 |
20100307864 | AUTOMOTIVE MUFFLER HAVING MEANS FOR SWITCHING BETWEEN LOUD AND QUIETER MODES - An automotive muffler having a device for switching between loud and quieter modes includes a chamber having an inlet exhaust pipe and an outlet exhaust pipe for the passage of exhaust gases through the chamber. The first section of the chamber has a plurality of baffles with openings through the baffles for the passage of the exhaust gases. A second section of the chamber, separated from the first section of the chamber, permits a substantially unobstructed passage of exhaust gases through the second section of the chamber to the outlet exhaust pipe. A switching device is able to be selectively switched between diverting incoming exhaust gases substantially through only the first section of the chamber and diverting incoming exhaust gases substantially though only the second section of the chamber, so that when the exhaust gases are substantially diverted through only the first section of the chamber having the baffles, the automotive muffler is operated in a quiet mode and when the exhaust gases are substantially diverted through only the second section of the chamber, the automotive muffler is operated in a loud mode. | 12-09-2010 |
20130233642 | Exhaust Valve Combined With Active Noise Control System - A vehicle exhaust system includes at least one exhaust component that defines an exhaust passage from an engine to an exhaust outlet. An active noise attenuation component is associated with the exhaust component. A valve is positioned within the exhaust component downstream of the engine and upstream of the active noise attenuation component. The valve and active noise attenuation component cooperate with each other to control noise generated by the exhaust system. | 09-12-2013 |
181255000 | Expansion chamber | 6 |
20090065296 | Fixing Device of Catalyst Substrate - A fixing device includes a muffler and a catalyst mantle. The muffler is communicated with an exhausting route of an internal combustion engine. The muffler has at least one clapboard to divide inner space thereof for forming a plurality of expanding rooms, which are communicated with each other and configured for guiding waste gas. The catalyst mantle is integrated on the clapboard. The catalyst mantle has an admission terminal and an exhaust terminal communicated with the plurality of expanding rooms. A substrate having catalyst coated thereon is arranged in the catalyst mantle between the admission terminal and the exhaust terminal. At least one block is configured for preventing the substrate sliding to the exhaust terminal and a stopper is formed on the clapboard or an inner wall of the muffler for preventing the substrate sliding to the admission terminal. The fixing device improves the fixing capacity of the substrate, and decreases the manufacturing steps for arranging the catalyst mantle in the muffler. | 03-12-2009 |
20090090579 | Silencer for refrigeration cycle system - A silencer for a refrigeration cycle system is disclosed. The silencer includes a silencing chamber | 04-09-2009 |
20090236175 | EXHAUST STRUCTURE OF MOTORCYCLE - An exhaust pipe connected to an exhaust port of an engine and an expansion chamber is disposed in the vicinity of the engine. A main tube is provided that extends rearwardly from a head pipe disposed at the front side of a main body. An engine having a cylinder extending upwardly from a crankcase is disposed under the main tube with an exhaust port open at the front side of the cylinder. A first exhaust pipe is provided that is connected to the exhaust port. A down tube is disposed on the center line in the left-right direction of the main body. The exhaust port disposed behind the down tube is deviatingly open at one side from the center line. The first exhaust pipe extends forward from one side of the down tube, and to the other side of the down tube, subsequently turns, and extends again to one side. | 09-24-2009 |
20090308686 | Venturi muffler - A venturi muffler is made of a plurality of metallic tubular stepped members which are stacked together and define at least one sound-reflective chamber which opens through an annular venturi passage into an axial flow passage of the venturi muffler thereby creating a partial vacuum in the annular chamber. The annular chambers include aligned openings through which exhaust gasses flow but are also reflected by walls of the sound-reflective chambers. Therefore, the exhaust sound or noise is dampened by the cancellation of sound waves 180 degrees out of phase with each other, the creation of a partial vacuum through which sound cannot propagate or propagates minimally, and by the heat removed by all of the metallic heat-conductive venturi-forming segments of the venturi muffler. | 12-17-2009 |
20100230204 | EXHAUST DEVICE FOR ENGINE - An exhaust device for an engine cam include a flow rectifying device for rectifying a flow of an exhaust gas. The flow rectifying device is disposed in an upstream end of an inner pipe, and comprises protrusions projecting inwardly. The exhaust gas engaging the flow rectifying device has passed through a curved portion of the inner pipe. The inner pipe also includes a muffler having a plurality of vent holes disposed in an inner portion thereof, and an outer pipe surrounding the inner pipe, defining an angular chamber therebetween. | 09-16-2010 |
20190145566 | NOISE ATTENUATORS FOR USE WITH PROCESS CONTROL DEVICES | 05-16-2019 |