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| Number | Title | Issue Date |
| 8141476 | Durable piston and a ring unit for the durable piston A durable piston is applied in a cylinder of an engine to output internal exploding power and has a piston head and a durable ring unit. The piston head is mounted in the cylinder of the engine, is driven for outputting kinetic energy and has a ring unit mount. The ... | 03/27/2012 |
| 7634963 | Piston ring comprising a coated running surface, and coating agent The invention relates to a piston ring whose running surface is provided with a coating containing a plastic material. Said piston ring is characterized in that the coating is composed of at least one polyamide-imide and/or at least one polyether ether ketone with e... | 12/22/2009 |
| 7594467 | Internal combustion engine with improved thermal efficiency An internal combustion engine includes a piston adapted to reciprocate in a cylinder. The piston includes a first portion, a second portion, and a third portion. The first portion of the piston forms a crown surface of the piston, the second portion of the piston fo... | 09/29/2009 |
| 7273355 | Compressor assembly with piston having multiple cross sections A compressor assembly having a piston with multiple cross sections. The compressor assembly, in one form thereof, includes a cylinder block defining a cavity. A piston is at least partially disposed in the cavity and reciprocates along a central axis of the cavity. ... | 09/25/2007 |
| 7185582 | Oilless reciprocating fluid machine An oilless reciprocating fluid machine has a piston mounted to a connecting rod by inserting a piston pin in a pin bore of a cylinder. The piston is reciprocally moved up and down in the cylinder with reciprocating of the connecting rod. A reinforcement plate is emb... | 03/06/2007 |
| 7175400 | Compressor assembly with reciprocating piston and vented cylinder A compressor assembly including a cylinder block defining first and second cavity portions. A central axis extends through first and second cavity portions. A compressible fluid respectively enters and exits the first cavity portion through an inlet and outlet. A pi... | 02/13/2007 |
| 7077402 | Combined oil ring A combined oil ring 4 is comprised of an oil ring 5 having upper and lower rails 7 and 8, and an expander 6 for applying contact pressure radially outwards on the oil ring 5. The outer circumferential surface 11 of th... | 07/18/2006 |
| 7066078 | Piston for internal combustion engine By casting a preformed member composed of a fiber reinforced material into a base material of a piston, a pair of crown reinforcing portions corresponding to respective pin boss portions are formed on a crown portion, and the pair of crown reinforcing portions are c... | 06/27/2006 |
| 7024982 | Combination of piston and piston ring A combination of piston and piston ring includes a piston having a piston ring groove in which at least the groove portion of the piston is made of steel, a piston ring made of cast iron and fitted into the piston ring groove, and a hard coat film formed to at least... | 04/11/2006 |
| 6739239 | Caston piston The invention relates to a molded piston, in particular an injection-molded piston (1) of fiber-reinforced plastic, which is seated slidably in a receiving bore (2) of a housing (4) and is embodied as a cup-shaped body with a piston bottom (6... | 05/25/2004 |
| 6609454 | Piston with seal A method of forming a floating piston includes fabricating a piston cup, wherein the piston cup includes a top, a sidewall void of any seal-gripping irregularities, and an open end, and forming an elastomer seal over the sidewall of the piston cup. A floa... | 08/26/2003 |
| 6305266 | Piston or plunger and a method for making the same A piston or plunger and a method for making the same A piston or plunger comprises a piston body and a sealing member. The piston body is preferably made from metal by moulding, such as casting or pressure moulding and sintering. The sealing member is made fro... | 10/23/2001 |
| 6293764 | Reciprocating compressor with dry lubricating system The compressor contains at least one piston (5) guided in a dry-running manner which, together with a cylinder insert (33), bounds a ring gap which is open over the common longitudinal section in each case and permits a leakage flow of the compressed medi... | 09/25/2001 |
| 6205908 | Piston equipped with piston ring The present invention aims at reducing the amount of oil consumption in a piston using a piston ring continuously formed of resin without being provided with an abutment. A stepped portion is formed on a third land, which is located below a second ring ha... | 03/27/2001 |
| 5948330 | Method of fabricating chopped-fiber composite piston A three-dimensional piston molding is fabricated from a mixture of chopped, carbon tow filaments of variable length, which are prepregged with carbonaceous organic resins and/or pitches and molded by conventional molding processes into a near net shape, t... | 09/07/1999 |
| 5884550 | Integral ring carbon-carbon piston An improved structure for a reciprocating internal combustion engine or compressor piston fabricated from carbon-carbon composite materials is disclosed. An integral ring carbon-carbon composite piston, disclosed herein, reduces the need for piston rings ... | 03/23/1999 |
| 5598763 | Flutter free piston ring assembly A piston and ring assembly operative within a cylindrical bore wall to retain fluid to one side. The piston has a side wall for movement along the cylindrical wall and has one or more spaced grooves in the side wall, each groove defining a pair of interio... | 02/04/1997 |
| 5499572 | Bi-tech piston A piston for developing compression within the cylinder of a combustion engine or other type compression generating apparatus; said piston being a two-piece assembly, whereas the topside portion, or traditionally known as the crown, being of relative disc... | 03/19/1996 |
| 5435234 | Mechanically retained wear-resistant ceramic pad A ceramic-metal composite structure which minimizes tensile ceramic loads and accommodates differences in thermal expansion characteristics between a metal member and a ceramic member without reliance on precise feature control for either member. The comp... | 07/25/1995 |
| 5408916 | Piston having a liner and method for manufacturing same A piston assembly (10) for use in an engine. The piston assembly (10) includes a piston body (12) with a liner (24) covering the interior surface (22) thereof. The liner (24) imbues added strength and dimensional stability during casting, machining, engin... | 04/25/1995 |
| 5404792 | Piston for internal combustion engine A piston for an internal combustion engine comprises at least a pair of ribs arranged between an inner surface portion of a skirt and side portions of pin bosses. The ribs are symmetrical with respect to a thrust center line of the piston and have in a lo... | 04/11/1995 |
| 5282411 | Heat-insulating piston with middle section of less dense but same material This heat-insulating piston has a piston head comprising a piston head base portion consisting of a ceramic material, a heat-insulating member jointed to the piston head base portion and consisting of a whisker fired member of the same ceramic material as... | 02/01/1994 |
| 5279211 | Mechanically retained wear-resistant ceramic pad A ceramic-metal composite structure which minimizes tensile ceramic loads and accommodates differences in thermal expansion characteristics between a metal member and a ceramic member without reliance on precise feature control for either member. The comp... | 01/18/1994 |
| 5273009 | Silicon-nitride-inserted piston A metal of which the body of a piston is formed contains iron as its main component, and the configuration of a silicon nitride member, the high-temperature strength of the silicon nitride material that composes the silicon nitride member, the melting poi... | 12/28/1993 |
| 5251540 | Piston having an aperture with an insert secured therein A piston, e.g. for an internal combustion engine, comprises a crown (16) and a skirt (12). The skirt (12) has an aperture (22) in which an insert (14) of a different material from the remainder of the skirt is secured. The insert (14) may be of plastics m... | 10/12/1993 |
| 5245913 | Piston of internal combustion engine A piston of an internal combustion engine, arranged to suppress engine noise and vibration while improving the frictional resistance and seizure resistance of a piston skirt. The piston skirt of the piston is formed at its outer peripheral surface with a ... | 09/21/1993 |
| 5195478 | Piston for an internal combustion engine Disclosed is a piston for an internal combustion engine, which includes a land portion, and a skirt portion including a non-coated portion which is formed in an arbitrary shape on a sliding portion thereof and a coated portion which is formed on a sliding... | 03/23/1993 |
| 5193435 | Piston with ceramic load-transmitting pads A piston comprises a crown (12) and a skirt (20). At least a portion of the skirt (20) is formed of a ceramic material injection moulded directly on to the remainder of the skirt (20) or the crown (12). The ceramic material provides a plurality of pads (2... | 03/16/1993 |
| 5174193 | Pistons for engines or motors The piston comprises a crown (12), and a skirt 30 made of plastics material secured to the crown. The crown (12) is formed integrally with a depending boss (16) arranged to receive a gudgeon pin (18) by which the piston is connected to a connecting rod (2... | 12/29/1992 |
| 5146883 | Piston and connecting rod assembly In a piston and connecting rod assembly for internal combustion engines, which assembly comprises a spherical small end portion, which is movably mounted in a recess of the piston head and in a retaining ring and which is connected to the skirt of the pis... | 09/15/1992 |
| 5092289 | Light alloy piston In a light alloy piston for use in diesel engines for an indirect fuel injection, a body of fibrous material is embedded in the cast piston head and is formed with a shallow combustion recess. In order to improve the conduction of heat outside the portion... | 03/03/1992 |
| 5018489 | Heat-insulating piston In a heat-insulating piston comprising a ceramic cylindrical member having the lower end surface thereof in contact with the outer peripheral upper end surface of a piston skirt member, a head base member having the peripheral portion thereof in contact w... | 05/28/1991 |
| 5014604 | Piston for internal combustion engine An internally-chilled piston for an internal combustion engine is provided. This piston comprises a piston body made of an aluminum alloy and a piston head including a cylindrical member and a ring-shaped member engaging the outer peripheral surface of th... | 05/14/1991 |
| 4986231 | Piston with graphite fiber mesh Disclosed herein is a method of manufacturing a piston comprising the steps of providing a shell comprising graphite fibers formed to include the general shape of an open-ended cylinder having an outer periphery, and casting metal to form at least a porti... | 01/22/1991 |
| 4971003 | Piston of aluminum alloy for internal combustion engines A fiber reinforced wire set along the edge of an open combustion chamber, which is provided in the piston head of a piston, is remelted with the edge of the combustion chamber, and solidified in order to reinforce the edge of the combustion chamber.... | 11/20/1990 |
| 4966068 | Split ceramic piston ring arrangement with nested biasing ring A piston-ring arrangement for use in an internal combustion engine including a cylinder with a piston axially displaceable within the cylinder and at least one piston ring guided in the cylinder. The cylinder, piston and piston-ring are made of a ceramic ... | 10/30/1990 |
| 4942804 | Piston with ceramic insert that covers piston head portion defining cavity A piston head has a cavity and a central projection projecting into the cavity. A ceramic insert is cast in a piston body so as to cover a piston head portion defining the cavity except the central projection-and-its adjacent piston head portion. The cera... | 07/24/1990 |
| 4939984 | Investment-cast piston crown cap with encapsulated non-metallic insulating core Pistons for internal combustion engines, particularly compression ignition engines. The pistons have insulating crowns and include a crown having a cap thereon, extending over the crown surface area, the crown cap being composed of an iron-based or a nick... | 07/10/1990 |
| 4936269 | Method and apparatus for reduced oil consumption and oil deterioration in reciprocating engines A method and apparatus for reducing oil consumption and oil deterioration in a reciprocating engine. The engine is provided with ceramic rings and ceramic cylinder linings. Minimal oil lubricant is adsorbed on the surface layer of the rings and liners to ... | 06/26/1990 |
| 4920864 | Reinforced piston A reinforced lightweight metal piston having fibers within the piston crown to reinforce the crown surface to improve the thermal properties and wear resistance of the crown surface. The reinforcing fibers are embedded in the piston metal using a pressure... | 05/01/1990 |
