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| Number | Title | Issue Date |
| 8123227 | Sliding member A sliding member is characterized in that a sliding surface of the sliding member is coated with an amorphous hard carbon film, and a surface of the amorphous hard carbon film has a ten-point mean roughness of equal to or less than 0.7 micrometers and an initial wea... | 02/28/2012 |
| 8033550 | Piston ring having hard multi-layer coating A piston ring (22) is covered at least partially with a layered structure (30). The layered structure (30) comprises: —a first intermediate layer (32) comprising at least one element of group IVB, group VB or group VIB; —a second inte... | 10/11/2011 |
| 7891669 | Piston ring with chromium nitride coating for internal combustion engines The invention relates to a piston ring for internal combustion engines, the piston ring comprises a steel or cast iron base material with a coating of chromium nitride deposited by a physical vapor deposition process on a sliding surface of the piston ring, wherein ... | 02/22/2011 |
| 7871078 | Piston ring and method for the production thereof A piston ring includes a running surface having a running surface profile, and an upper flank surface and a lower flank surface. At least the running surface is provided with a vapor-deposited layer such that part of the running surface is provided with a removable ... | 01/18/2011 |
| 7458585 | Sliding member and production process thereof There is provided a sliding member including a base body and a hard carbon coating formed on the base body to define a sliding surface for sliding contact with an opposing member under lubrication according to one embodiment of the present invention. The hard carbon... | 12/02/2008 |
| 7267344 | Piston ring with a PVD coating A piston ring for an internal combustion engine is made of steel and has an outer contact surface that is nitrated and coated to no more than 70 μm with a protective coating comprising nitrides of aluminum and/or silicium and/or zirconium in a matrix of chromium-ni... | 09/11/2007 |
| 7252292 | Oil ring for an internal combustion engine An oil ring for an internal combustion engine, comprising a metallic annular body (10) to be mounted around a piston (P) reciprocating inside a cylinder (C) of the engine, said annular body (10) having opposite lateral faces (11), an internal fa... | 08/07/2007 |
| 7244493 | Coated article In one embodiment, a coated article comprises a substrate with a coating comprising diamond like carbon layer, wherein the diamond like carbon layer comprising carbon and sulfur as terminal sulfur functional groups, wherein greater than or equal to about 70 wt % of ... | 07/17/2007 |
| 7144017 | Piston ring having wear resistant composition A piston ring including at least one intermetallic alloy is provided. A piston ring having a wear-resistant composite composition and a piston ring coating comprising a wear-resistant composition are also provided. ... | 12/05/2006 |
| 7117961 | Dynamic seal with soft interface A device and method for dynamically sealing between rotatable members such as a rolling cone of a rock bit. The assembly includes a seal ring having a facing surface of a relatively hard material, such as hardened steel or tungsten carbide, and a second seal ring of... | 10/10/2006 |
| 7117594 | Oil-scraper piston ring and a method for producing an oil-scraper piston ring A piston oil control ring with at least one tapered running rail, provided with a wear-resistant coating, characterized in that a radial elevation with predetermined radial height and width, which is provided with the wear-resistant coating, is provided in the regio... | 10/10/2006 |
| 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 |
| 7052019 | Piston ring and method of manufacturing the same A manufacturing method of a piston ring is developed, wherein the method provides a countermeasure for wear of butt ends of the ion plating film coated piston ring and a countermeasure for breakage of the piston ring and the piston ring manufactured at a low cost. A... | 05/30/2006 |
| 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 |
| 6838196 | Nickel-aluminide based wear resistant material for piston rings A piston ring comprises a coating of a wear-resistant composite composition, particularly intended for high temperature applications. The wear-resistant composite composition comprises a ceramic compound and at least 50 volume %, based on the total volume of the wea... | 01/04/2005 |
| 6698763 | Piston ring A piston ring having a stainless steel base material, the base material having an upper surface, a lower surface, an inner circumferential surface and an outer circumferential surface, the surfaces each having a nitride layer formed thereon, the nitride l... | 03/02/2004 |
| 6508473 | Piston ring A piston ring is made of martensitic stainless steel. Except for the outer circumferential surface of the piston ring, a nitrided layer having a Vickers hardness of 700 or more is formed on the upper and lower surfaces and inner circumferential surface, a... | 01/21/2003 |
| 6494461 | Sliding member An improved sliding member is provided that has a sliding surface and a deposition layer formed on the sliding surface utilizing an ion-plating method, wherein the deposition layer is composed mainly of chrome nitride, including CrN. The CrN of the chrome... | 12/17/2002 |
| 6485027 | Surface heat treatment of piston rings A piston ring for use in a piston of an internal combustion engine comprises a base material of a first hardness formed into a ring, and a secondary material of a second hardness formed by selective and superficial heat treatment of an outer portion of th... | 11/26/2002 |
| 6454271 | Combined oil ring A combined oil ring is comprised of an oil ring and an expander. The cross section of the oil ring is a generally I-shape, and the outer circumferential surfaces of outer rail portions form sliding surfaces to make contact with the cylinder wall surface. ... | 09/24/2002 |
| 6439351 | Brake for a hydraulic vehicle brake system, sealing ring for such a brake and method for producing such a sealing ring A brake (10) for a hydraulic vehicle brake system has a housing (14) with a bore (18) which is formed therein and in which a brake piston (20) is received in a sealingly and slideably displaceable manner. The brake piston (20) is adapted to press a brake ... | 08/27/2002 |
| 6325384 | Tank piston with improved seal and wiper A tank piston is shown with an improved seal and wiper. The piston is used in conjunction with tanks used for transporting semi-solid and viscous materials such as grease, oil, ink, and the like. The improved seal consists of an annular rubber member with... | 12/04/2001 |
| 6325385 | Piston ring A piston ring has a diamond-like carbon film formed in a thickness of 0.5 to 30 micrometers over an under film on the upper and lower surfaces. The under film is directly formed on the surfaces, or formed on a hard surface treatment layer consisting of a ... | 12/04/2001 |
| 6282898 | Operation of forced induction internal combustion engines A spark ignition internal combustion engine having at least one combustion chamber and an operating cycle with induction, compression, power and exhaust phases, said engine having a forced induction system including an intake air compressor supplying inta... | 09/04/2001 |
| 6279913 | Sliding member and manufacturing method thereof A piston ring is formed over the entire surface with a gas nitrided layer. A diamond-like carbon film is formed in a thickness of 0.5 to 30 micrometers over the gas nitrided layer at the upper and lower surfaces. The diamond-like carbon film has a surface... | 08/28/2001 |
| 6270081 | Combination of piston ring for use in internal combustion engine A piston ring combination including at least one compression ring and at least one oil ring. If a plurality of compression rings are provided, an outer peripheral surface of at least a top ring is formed with a first ion plating layer. The oil ring has a ... | 08/07/2001 |
| 6209881 | Cast-iron piston ring A cast-iron piston ring for a piston of an internal combustion engine includes a ring composed of cast-iron and having a circumferential surface; a nitrided layer covering the entire circumferential surface of the ring, the nitrided layer including a diff... | 04/03/2001 |
| 6142481 | Piston ring A piston ring is formed over the entire surface with a gas nitrided layer and a hard film with a thickness of 0.5 to 30 micrometers on the gas nitrided layer at the upper and lower surfaces. The hard film comprises diamond-like carbon in which are dispers... | 11/07/2000 |
| 6139022 | Piston ring A piston ring is formed over the entire surface with a gas nitrided layer and a hard film with a thickness of 0.5 to 10 micrometers on the gas nitrided layer at the outer circumferential surface. The hard film comprises diamond-like carbon in which are di... | 10/31/2000 |
| 6139984 | Sliding member An object of the present invention is to provide a sliding member which is coated a film having superior wear resistance, superior scuffing resistance and a superior property not to increase an amount of wear on an opponent material (an opponent attacking... | 10/31/2000 |
| 6068407 | Seal for an anti-friction bearing The invention permits stacking of seals without possibility of the sticking of their synthetic rubber seal members to one another. Moreover, when assembling the seals to produce anti-friction bearings, the invention permits storing the seals as a stack in... | 05/30/2000 |
| 6048625 | Wear resisting steel, sliding member for cylinder in internal combustion engine, and ring spring Wear resisting steel, a sliding member for a cylinder in an internal combustion engine, and a ring spring consist of: carbon: equal to or less than 2.2% by weight; silicon: equal to or less than 1.2% by weight; manganese: equal to or more than 0.2 % by we... | 04/11/2000 |
| 6013380 | Composite chromium plating film and sliding member covered thereof A piston ring formed with a nitrided layer over all surfaces and formed with a composite chromium plating film over the nitrided layer in the outer circumferential surface. The composite chromium plating film has a network of cracks formed on the outer su... | 01/11/2000 |
| 5820131 | Piston ring having wear coating consisting of Cr2 N or a mixture of Cr2 N and Cr A Cr2 N film or a mixed Cr2 N and Cr film formed by physical vapor deposition on the outer circumferential surface of a piston ring which is in contact with the inner circumferential surface of a cylinder. The axial width of the oute... | 10/13/1998 |
| 5794943 | Piston rings particularly suited for use with ceramic matrix composite pistons and cylinders A piston ring for use with ceramic matrix composite engine cylinders. In one embodiment, an extra-hard material is used for a conventional ring design. In another embodiment, a hardened edge employing Tungsten Carbide Cobalt is employed. The same edge tre... | 08/18/1998 |
| 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 |
| 5547203 | Segmented ceramic inlay piston ring A piston ring comprises a generally annular ring body with a series of slots spaced circumferentially about an outer periphery of the ring body, each of the slots extending radially inwardly from the outer periphery. A hinge point is formed between adjace... | 08/20/1996 |
| 5531195 | Piston ring A piston ring developed to prevent aluminum deposition and adhesion thereon is disclosed. The piston ring includes a ring-shaped piston ring main body including upper, lower, outer circumferential surfaces. An anti-abrasion surface treatment layer is form... | 07/02/1996 |
| 5392692 | Antiblow-by piston and seal construction for high temperature applications A piston and ring assembly operative within a cylindrical bore wall to retain fluid to one side of the assembly, comprising a piston having at least one annular stepped groove in the side wall of the piston, the groove being stepped into uppermost and low... | 02/28/1995 |
| 4899702 | Aluminum alloy piston and piston-ring assembly treated to suppress agglutination of the piston alloy to a piston-ring A piston and piston-ring assembly includes a piston and piston-rings located in piston-ring grooves formed in the piston. Such a kind of surface hardening treatment as is accompanied by an increase in surface roughness, such as alumite treatment, is appli... | 02/13/1990 |
