| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 123193400 | Having detail to guiding structure cooperating with cylinder | 33 |
| 20080216790 | Piston for an Internal Combustion Engine - A piston for an internal combustion engine is provided that comprises a piston head, onto which a piston hub and a piston skirt are formed, as well as reinforcing ribs, which extend between piston hub and piston skirt and which each comprise two portions that are curved in opposite directions. | 09-11-2008 |
| 20090038577 | Small End Con Rod Guidance Piston - A connecting rod for a piston assembly includes first and second guidance members for guiding a piston assembly within a cylinder during piston stroke along a first axis. The guidance members are supported by first and second support ribs extending from a shaft of the connecting rod and include first and second sliding surfaces for contacting side walls of the cylinder. The connecting rod includes an attachment boss disposed at a first end of the shaft and defines a second axis perpendicular to the first axis. The first and second support ribs extend radially outwardly from the attachment boss and are spaced radially about the second axis by approximately 180 degrees. | 02-12-2009 |
| 20090090325 | Piston Skirt Oil Retention for an Internal Combustion Engine - An internal combustion engine is provided having a cylinder case with at least one cylinder bore wall defining at least one cylinder bore. At least one piston is reciprocally movable within the at least one cylinder bore. The at least one piston includes at least one skirt portion preferably having a barrel-shaped profile. The cylinder bore wall has an oleophobic characteristic, while the at least one skirt portion has an oleophilic characteristic. The oleophobic and oleophilic characteristic is produced by at least one of coating and machining the at least one cylinder bore wall and the at least one skirt portion, respectively. | 04-09-2009 |
| 20100089358 | PISTON WITH IMPROVED SIDE LOADING RESISTANCE - A piston including a crown and a skirt extending generally axially away from the crown. The skirt includes a pair of opposed skirt panel portions and a band spaced away from the crown and extending generally around a perimeter of the piston. The piston further includes a pair of strut assemblies, each strut assembly including a pair of struts which converge in a radially outward direction. Each strut terminates at or adjacent to one of the panel portions. | 04-15-2010 |
| 20110048362 | Internal conbustion engine - An internal-combustion engine comprised of a cylinder with at least one piston which is moving to and fro in it, and a piston rod ( | 03-03-2011 |
| 20110094470 | COMBUSTION ENGINE COMBUSTION CHAMBER - A piston for an internal combustion engine, for example a diesel engine, including a body delimited laterally by a skirt and configured to collaborate with walls of a cylinder of axis of revolution C in which the piston can slide along the axis C, the piston including a transverse face including a central pip, a peripheral ring, and a bowl of axis of revolution B that extends from the central pip towards the peripheral ring to which it connects at a lip of thickness Ep, the bowl including, in substantial vertical alignment with the lip, a torus in profile, for example of dome-shaped, of maximum radius capable of guiding fuel injected under the lip in the region of a re-entrant zone towards the central pip. The tip of the central pip exhibits a flattened region centred on the axis of revolution B of the bowl, of a width Lt ranging between 0 mm and 5 mm, or substantially equal to 2.5 mm. | 04-28-2011 |
| 20120227699 | LINERLESS ENGINE - A linerless engine includes a casting defining a bore having an inner surface and a central longitudinal axis. The casting is formed from a castable aluminum-silicon alloy including silicon particles present a range of from about 11 to about 12.5 parts by weight. The inner surface has a surface variation defined by at least some of the silicon particles protruding toward the axis for from about 0.6 to about 1.5 microns. The linerless engine includes a piston slideably disposed within the bore and configured for translating along the axis, wherein the piston is formed from an aluminum alloy and includes a body having a skirt portion coated with a first coating, and at least one ring encircling and in contact with the body. The ring is coated with a diamond-like coating that is free from degradation when in contact with the at least some of the silicon particles. | 09-13-2012 |
| 20130092116 | PISTON FOR SPARK-IGNITION ENGINE - The present invention provides a piston for a spark-ignition engine, comprising: a land part | 04-18-2013 |
| 20130098329 | Internal Combustion Engine - In an engine, blow-by is substantially eliminated and friction is significantly reduced using one or more combinations of non-metallic rings. By substantially eliminating blow-by and by reducing friction, certain engine parameters may be changed. In addition, by substantially eliminating blow-by and by reducing friction, pollution may be reduced, fuel economy may be increased and power may be increased. | 04-25-2013 |
| 20130167797 | METHODS AND SYSTEMS FOR MANAGING A CLEARANCE GAP IN A PISTON ENGINE - A piston engine may include a piston assembly, which may include a piston having a self-centering feature. The piston assembly may be configured to translate in a bore of the cylinder, and contact a combustion section and/or gas driver section. The self-centering feature may use a flow of blow-by gas in a clearance gap to provide a self-centering force on the piston assembly. The self-centering feature may include one or more slotted pockets, a step, a tapered portion, any other suitable feature, or a combination thereof. Optionally, a piston assembly may include a feature that aids in self-centering such as, for example, a labyrinth seal. | 07-04-2013 |
| 20130167798 | Methods and Systems for Managing a Clearance Gap in a Piston Engine - A piston engine may include a clearance gap between a piston assembly and a cylinder. The piston may be configured to translate in a bore of the cylinder. The clearance gap between the piston assembly and the bore may be actively or passively controlled. A control system may provide one or more adjustments based on, for example, a detected temperature, pressure, flow rate, work metric, and/or other indicator. The adjustments may include, for example, adjusting a cylinder liner, adjusting a flow through a bearing element, adjusting a coolant flow, adjusting a heat pipe property, and/or other adjustments. One or more auxiliary systems may be used to provide the adjustments. | 07-04-2013 |
| 20130180493 | STEEL PISTON FOR INTERNAL COMBUSTION ENGINES - A semifinished product blank, suitable for the production of a steel piston ( | 07-18-2013 |
| 20130213340 | PISTON ASSEMBLY FOR INTERNAL COMBUSTION ENGINE - A piston assembly includes a piston having a crown with an upper combustion surface with a cylindrical outer surface extending downwardly from the upper combustion surface. A pair of pin bosses depends from the crown to a pair of pin bores having generally cylindrical bearing surfaces aligned along a pin bore axis with a top wall portion extending between the pin bosses. The top wall portion has a concave bearing surface forming a continuous concave bearing surface with the pin bores. A separate skirt is fixed to the piston against relative movement. At least one rib extends upwardly from the top wall portion of the piston on opposite sides of the pin bore axis to a lower wall surface of the crown. The at least one rib joins the crown to the top wall portion to provide structural support to the top wall portion against unwanted deflection. | 08-22-2013 |
| 20130220264 | ENGINE AND CYLINDER WITH GAS EXCHANGE THROUGH THE CYLINDER WALL - An engine cylinder with a piston and at least one, preferably two or four, cam-operated valves leading to the combustion chamber. A valve seat of the valve is formed in the cylinder wall immediately laterally adjacent to the cylinder bore or to the cylinder chamber. The valve axis and the cylinder axis enclose an acute angle A of 5°≦A≦25°, preferably 10°≦A≦20°. The axis of the inlet channel or the outlet channel leading to the valve seat in a plane defined by the valve axis and the cylinder axis is inclined at an angle B of 25°≦B≦65°, preferably 40°≦B≦50° to the valve axis. | 08-29-2013 |
| 20130306020 | 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. | 11-21-2013 |
| 20140000549 | COMPRESSION RING FOR AN ENGINE | 01-02-2014 |
| 20140109861 | PISTON AND TRIBOLOGICAL SYSTEM CONSISTING OF A PISTON AND A CYLINDER RUNNING SURFACE OF A CYLINDER CRANK CASE FOR AN INTERNAL COMBUSTION ENGINE - A piston for an internal combustion engine may include a piston head and a piston skirt. The piston skirt may have piston bosses provided with boss bores. The piston bosses may be connected to each other at running surfaces. The running surfaces may be provided at least partially with a coating which is sprayed using a cold gas method. The material of the coating may be selected from the group comprising at least one of nickel, iron, copper, nickel-based alloys, iron-based alloys, copper-nickel-tin-based alloys and copper-tin-silver-based alloys. | 04-24-2014 |
| 20140137832 | SEALING SLEEVE - A sealing sleeve for sealing between piston and cylinder wall in internal combustion engines with a height in the direction of piston movement that is at least three times as large as its width in the radial direction of the cylinder having a pressurised annular cut out ( | 05-22-2014 |
| 20140158081 | PISTON FOR INTERNAL COMBUSTION ENGINE - A piston capable of reducing the frictional resistance between skirt portion and a cylinder inner surface and improving fuel efficiency is provided. The invention is a piston for an internal combustion engine wherein when the piston slides along a cylinder inner surface, a high surface pressure portion occurs at a center of each skirt portion and low surface pressure portions occur at both sides of the high surface pressure portion. The high surface pressure portion of plural portions is provided with a horizontal groove. The low surface pressure portions of the plural portions are provided with an inclined groove that is inclined downward toward the high surface pressure portion and that is connected to an end portion of the horizontal groove. | 06-12-2014 |
| 20140209052 | PISTON ARRANGEMENT AND ENGINE - A piston arrangement comprising a piston movable within a cylinder and having a stroke with a first end and a second end, wherein the piston is coupled to a crankshaft by a linkage mechanism including a toggle link which is pivotally coupled to the piston and pivotally coupled to a con-rod, wherein the toggle link has a first position corresponding to the first end of the piston stroke, a second position different to the first position also corresponding to the first end of the piston stroke, and an intermediate position between the first and second positions corresponding to the second end of the piston stroke such that the piston completes four strokes for every one revolution of the crankshaft. Also a piston arrangement comprising first and second pistons movable respectively within first and second cylinders, wherein the first piston is coupled to a crank shaft by a first linkage mechanism including a first toggle link pivotally connected to the first piston and pivotally connected to a first con-rod, wherein the second piston is coupled to the crank shaft by a second linkage mechanism including a second toggle link pivotally connected to the second piston and pivotally connected to a second con-rod, wherein the first and second con-rods have different lengths such that the first and second pistons operate out of phase with each other. Also an engine comprising at least two high pressure pistons movable within respective high pressure cylinders and at least one low pressure piston movable within a low pressure cylinder, wherein the low pressure piston moves through twice the number of strokes moved through by each of the high pressure pistons in the same period of time, wherein a linkage mechanism coupling the low pressure piston to a crankshaft includes a toggle link. | 07-31-2014 |
| 20140299090 | Ventilation Slots in a Cylinder Wall - In two-stroke engines, it is common to provide two compression rings on the piston and an additional oil ring. The oil ring can be on the piston, but yields a longer piston. Alternatively, the oil ring is placed in a circumferential groove in the cylinder liner. One problem with such a configuration is that the compression rings move with respect to the oil ring and the annular volume between the two is compressed during reciprocation of the piston, which can cause pumping of oil into the ports. According to embodiments of the present disclosure, axial slots are formed in the cylinder liner that extends from the circumferential groove toward the ports extending along the bridges and beyond the ports. This provides a vent for the annular volume to avoid pumping the oil into the ports. | 10-09-2014 |
| 20150007791 | SEAL UNIT OF A PISTON OF AN INTERNAL COMBUSTION ENGINE - The present invention relates to a seal unit ( | 01-08-2015 |
| 20150122211 | SLIDING BODY WITH COATING - A sliding body for an internal combustion engine may include a main part and a coating which at least partially covers the main part. The coating may have a first main layer. The first main layer may include main components which are molybdenum, nitrogen and oxygen. | 05-07-2015 |
| 20150122212 | MONOLITHIC, GALLERYLESS PISTON AND METHOD OF CONSTRUCTION THEREOF - A galleryless piston for an internal combustion engine and method of construction thereof are provided. The piston has a monolithic piston body extending along a central longitudinal axis. The piston body has an upper wall forming an upper combustion surface with first and second portions, with the first portion extending annularly along an outer periphery of the upper wall and the second portion forming a combustion bowl. The upper wall has an undercrown surface on an underside of the combustion bowl directly opposite the second portion of the upper combustion surface. The undercrown surface has an openly exposed 2-dimensional surface area, as viewed looking along the central longitudinal axis, between about 35-60 percent of an area defined by a maximum outer diameter of the piston body, thereby providing an expansive area against which oil being splashed or sprayed can freely contact to cool the piston. | 05-07-2015 |
| 20150136062 | COMBINATION OF CYLINDER AND PISTON RING - A combination of a cylinder | 05-21-2015 |
| 20150337959 | PISTON WITH KEYSTONE SECOND RING GROOVE FOR HIGH TEMPERATURE INTERNAL COMBUSTION ENGINES - A piston for a high temperature internal combustion engine is provided. The piston includes an upper wall, base wall, outer rib, and inner rib defining a cooling chamber therebetween, and a plurality of ring grooves formed in the outer rib. Only the second ring groove is formed with the keystone cross-section, and all of the other ring grooves are formed with the conventional rectangular cross-section. Thus, the piston can be formed with low manufacturing costs and can also provide exceptional performance when used in high temperature combustion engines, wherein the temperature at the first ring groove is greater than 280° C., and thus prevents carbon from depositing or burns off any carbon deposits, but the temperature at the second ring groove is between 200° C. and 280° C., in which case carbon deposits can form and cause the piston ring to stick. | 11-26-2015 |
| 20150354495 | PISTON ASSEMBLY FOR A RECIPROCATING ENGINE - A power cylinder system for a reciprocating engine includes a cylinder with an inner annular wall and defining a cavity having a bore diameter. The system includes a piston assembly having a piston disposed within the cylinder and configured to move in a reciprocating manner. The piston and the inner annular wall of the cylinder are separated by a diametral cold clearance that is less than approximately 0.5 percent of the bore diameter. The piston assembly includes a top-most groove extending circumferentially about the piston beneath a top land of the piston and a ring disposed within the top-most groove. One or more channels are formed in the top land or an upper surface of the ring and are configured to enable combustion gases to flow from the cavity to a space between an inner surface of the top-most groove and an inner face of the ring. | 12-10-2015 |
| 20150354496 | PISTON ASSEMBLY FOR A RECIPROCATING ENGINE - A power cylinder system for a reciprocating engine includes a piston configured to be disposed within a cylinder and to move in a reciprocating manner within the cylinder. The piston also includes a top-most groove extending circumferentially about the piston beneath a top land of the piston and a ring disposed within the top-most groove. A single channel is formed in the top land or the ring, and the single channel extends from an outer perimeter of the piston to a space between an inner surface of the top-most groove and an inner face of the ring. | 12-10-2015 |
| 20160040622 | PISTON ASSEMBLY FOR A RECIPROCATING ENGINE - A power cylinder system for a reciprocating engine includes a piston configured to move within a cylinder. The system includes a top-most groove extending circumferentially about the piston beneath a top land of the piston and configured to support a top ring having an inner circumferential face. A space is defined between a portion of the top-most groove and the inner circumferential face of the top ring while the top ring is positioned within top-most groove, and one or more channels formed in the top land are configured to enable transfer of combustion gases to the space. The system also includes a bottom-most groove extending circumferentially about the piston and spaced apart from the top-most groove along an axial axis of the piston, and the bottom groove is configured to support a bottom ring and is devoid of oil drains. | 02-11-2016 |
| 20160040780 | PISTON ASSEMBLY FOR A RECIPROCATING ENGINE - A power cylinder system for a reciprocating engine includes a piston configured to move within a cylinder. A top-most groove extends circumferentially about the piston and is configured to support a first ring, and a space is defined between a portion of the top-most groove and an inner circumferential face of the first ring while the first ring is disposed within the top-most groove. A bottom-most groove extends circumferentially about the piston and is axially spaced apart from the top-most groove. A second ring positioned in the bottom-most groove is configured to exert a pressure of less than approximately 1 MPa against an inner annular wall of the cylinder while the piston is positioned within the cylinder. One or more channels formed in the top land are configured to transfer combustion gases to the space while the first ring is disposed within the top-most groove. | 02-11-2016 |
| 20160053714 | Piston and Bowl for Gasoline Direct Injection Compression Ignition (GDCI) - A piston for use in a GDCI engine cooperates with the wall of a cylinder defined in the engine and with a cylinder head to define a combustion chamber. The surface of the piston that faces the cylinder head defines a bowl that is configured to receive fuel that is dispensed from a fuel injector that is located in the cylinder head substantially along the central axis of the cylinder. The bowl is configured such that substantially all of the injected fuel associated with a combustion event reaches a localized equivalence ratio greater than 0.0 and less than or equal to 1.2 at a time immediately preceding initiation of the combustion event. | 02-25-2016 |
| 20160177863 | IRON-BASED SPRAYED COATING, CYLINDER BLOCK FOR INTERNAL COMBUSTION ENGINE USING SAME, AND SLIDING MECHANISM FOR INTERNAL COMBUSTION ENGINE | 06-23-2016 |
| 20160186685 | PISTON FOR INTERNAL COMBUSTION ENGINE - A piston for an internal combustion engine includes a piston body. The piston body includes a head, two side walls, two skirts, and a reinforcement member. The head includes a recessed crown. Each side wall includes a pin boss configured to support a piston pin. The two skirts are respectively located at a thrust side with respect to an axis of the piston pin and an anti-thrust side with respect to the axis of the piston pin. The reinforcement member includes two legs and a connecting portion connecting upper ends of the two legs. The two legs are respectively insert-casted in the two skirts. The connecting portion is insert-casted in the head. | 06-30-2016 |
