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| Number | Title | Issue Date |
| 7494129 | Piston ring The invention relates to a piston ring comprising a slit forming a joint, a bearing surface, an inner peripheral surface, and upper and lower flanks extending thereinbetween. An inconstant cross-sectional interruption is provided in the region of the inner periphera... | 02/24/2009 |
| 7396018 | Oil scraper ring for pistons of internal combustion engines The invention relates to an oil scraper ring for pistons of internal combustion engines. The oil scraper ring comprises a disc that is provided with parallel flanks and a bearing surface having an asymmetrical crowned form with a vertex line extending over the perip... | 07/08/2008 |
| 7370866 | Sleeve element having a biasable end region, apparatus including same, and method of use A sleeve element having at least one end region configured to be biased into a laterally adjacent recess formed in one of a piston element surface and a bore surface is disclosed. A seal assembly is disclosed including two sleeve elements, each sleeve element having... | 05/13/2008 |
| 7306232 | Multipart oil wiping ring for pistons of internal combustion engines A multipart oil wiping ring for pistons of internal combustion engines comprises two steel strip-type lamellae with parallel sides, the running surfaces of which are provided with a convexly asymmetric shape having a vertex line that extends across the circumference... | 12/11/2007 |
| 7261301 | Oil scraper ring for pistons of internal combustion engines The invention relates to an oil scraper ring for pistons of internal combustion engines, said oil scraper ring comprising a disc (1) provided with a bearing surface (h) having an asymmetrical crowned form with a vertex line (3) extending over the perip... | 08/28/2007 |
| 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 |
| 6685193 | Self lubricating, non-sealing piston ring for an internal combustion fastener driving tool A non-sealing, lubricating piston ring for lubricating the cylinder wall of a piston housing in a combustion tool is disclosed. The lubricating piston ring is made from a lubricating material such as polytetrofluroethylene (PTFE). The shape of the PTFE ri... | 02/03/2004 |
| 6416058 | Packing seal with dynamic self-adapting lip The invention concerns a packing seal with its lip (1) placed in a toroidal housing (2) of a part (3) mobile in rotation and/or translation relatively to a part (4) and whereof the lip (5) ensuring the seal between the lining and the part (4) exerts on sa... | 07/09/2002 |
| 6213475 | Separating piston for a vibration damping system A separating piston for a vibration damping system with a cylinder which is filled partly with damping fluid and partly with pressure gas and with a separating piston which is arranged in the cylinder and divides the pressure gas space from the fluid spac... | 04/10/2001 |
| 5752705 | Piston rings A piston ring being planar, having a dished section and a planform giving desired radial pressure distribution on a co-operating cylinder wall and which ring is made form a steel resistant to stress relieving at the piston ring operating temperature. The ... | 05/19/1998 |
| 5695199 | Piston sealing assembly A sealing assembly that significantly reduces or eliminates blow-by, peristolic pumping and sealing element flutter while, at the same time, reducing to ultra low levels friction between the sealing element and its assembly. The assembly has surfaces in a... | 12/09/1997 |
| 5655433 | Piston-piston ring assembly and method for reducing engine exhaust emissions A piston--piston ring assembly for an internal combustion engine reduces hydrocarbon emissions without significantly increasing the cost of the engine. The assembly includes an upper piston ring groove and a piston ring which acts as check valve to preven... | 08/12/1997 |
| 5618046 | Piston ring assembly A piston ring assembly comprises a piston ring, a spring for providing an outward force on the ring, and a rail for engaging a cylinder wall. The piston ring is retained in a piston groove in a piston. During upward movement of the piston in a cylinder, o... | 04/08/1997 |
| 5607166 | Low friction fluid seal device with hinge and roll structure A fluid seal device comprising an annular body having an inner side, an outer side, a closed end face and an at least partly open end face wherein the at least partly open end face defines a first radial sealing area protruding outwardly from the outer si... | 03/04/1997 |
| 5085185 | Powder-lubricant piston ring for diesel engines A powder-lubricated piston is disclosed for diesel engines, particularly adiabatic diesel engines and coal-water slurry fueled diesel engines. Rings are provided for the piston which flex in response to combustion within the combustion chamber.... | 02/04/1992 |
| 5016524 | Sealing arrangement for a piston in a compressor A continuous seal ring member fitted in a ring groove of a piston of a compressor. The seal ring member has a washer-like initial shape with an internal diameter smaller than an outer diameter of the piston, whereby the inner peripheral portion of the sea... | 05/21/1991 |
| 5001965 | Piston and piston ring Pistons and associated piston rings are described for use in internal combustion engines. The piston and piston ring comprise an annular piston ring groove having two radially extending walls and an axially extending wall; a compression ring received in t... | 03/26/1991 |
| 4973066 | Piston ring A piston-and-ring assembly includes a piston having a circumferential groove which has an upper side wall and an opposite lower side wall; and a piston ring received in the groove and having opposite radial faces extending obliquely with respect to the si... | 11/27/1990 |
| 4909520 | Seal A shaft or piston seal for preventing unidirection fluid flow between two concentric mating members has an annular body in the form of a ring-like member with a polygonal profile in right cross section having innermost and outermost radial portions. One o... | 03/20/1990 |
| 4877257 | Piston ring A piston ring which consists of a sealing member supported by a flexible support structrue that deflects under applied loads to cause improved sealing and reduced wear. The support structure is constructed to react the applied loads such that the sealing ... | 10/31/1989 |
| 4540185 | Gas-lubricated seal for sealing between a piston and a cylinder wall A piston-cylinder seal uses gas for a lubricant and has a runner supported on a gapless structure and placed in the space between the piston and the cylinder wall. The runner is deformed elastically under the influence of the operating pressures to follow... | 09/10/1985 |
| 4466624 | Sealing arrangement The disclosed arrangement is for sealing between two cylindrical bodies with an annular gasket ring in such a way that the seal is established only under conditions of a predetermined fluid pressure, so that at a lower pressure a flow is permitted across ... | 08/21/1984 |
| 4428276 | O-Ring seal for piston of double-acting fluid pressure cylinder A double-acting pneumatic cylinder has a housing with a cylindrical chamber therein. A cylindrical piston is supported coaxially in the chamber for movement axially thereof and has a circumferential groove in the outer surface thereof. A pair of spaced, f... | 01/31/1984 |
| 4418924 | Bi-surface sealing mechanism with rolling/sliding O-ring A sealing mechanism positioned between a movable piston wall and stationary cylinder wall concentric therewith. The sealing mechanism includes a circumferential groove formed in one of the concentric walls, and an O-ring positioned in the circumferential ... | 12/06/1983 |
| 4355815 | Piston ring A cross-sectionally U-shaped radially inwardly open piston ring for a piston slidably received in a cylinder and dividing the cylinder into a high-pressure side and a low-pressure side. The piston ring includes first and second radially inwardly projectin... | 10/26/1982 |
| 4240644 | Piston seal A piston seal having two spring tensioned rings which are biased radially toward the cylinder wall and seated in the uppermost one of the ring groove in the piston head. The upper ring has a relatively small and constant thickness of between 0.005 and 0.0... | 12/23/1980 |
| 4121838 | Shaft seal structure A shaft coaxially mounted within a cylinder is sealed with respect to that cylinder by means of an annular carrier affixed to the shaft and having its periphery facing the inner wall of the cylinder provided with an annular seal groove having an inverted ... | 10/24/1978 |
| 3980310 | Ring manufacture, productive of face contact seal Methods, apparatus, and improved structure having as their common basis the sequence of collapsing a piston ring in a fixture approximating engine bore diameter, and separately lapping a major portion of the ring side and a remaining locality --narrow in ... | 09/14/1976 |
