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| Number | Title | Issue Date |
| 7429047 | Piston ring assembly A piston ring assembly includes an upper ring, a lower ring and an expander disposed between the upper and lower rings. When assembled, the piston ring assembly is positioned with a groove of a piston. During down stroke of the piston, the upper and lower rings radi... | 09/30/2008 |
| 7306233 | Combined oil control ring In mounting a combined oil control ring in a ring groove formed in a piston, the combined oil control ring is mounted in a form that an opening between but ends of an oil ring body is widened. In such an operation, it is likely that a coil expander falls off the oil... | 12/11/2007 |
| 7306234 | Oil control ring for pistons of internal combustion engines The invention relates to an oil control ring for pistons of internal combustion engines. The aim of the invention is to provide an improved shape-adaptation capacity in comparison to prior art, with a tangential force that enables the ring to guarantee low friction ... | 12/11/2007 |
| 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 |
| 7188841 | Secondary piston seal A secondary seal is provided for an internal combustion engine having a piston, cylinder bore, ring seal, secondary seal, and leak path. Forces are applied from the combustion side of the piston through a cylinder gap and a leak path to the secondary seal. The secon... | 03/13/2007 |
| 6860485 | Piston ring The present invention provides a piston ring comprising a piston ring main body and an expander ring arranged on an inner peripheral surface thereof, the expander ring comprising two oil expander rings, one of which is housed in a space in a spiral of the other. The... | 03/01/2005 |
| 6655697 | Piston oil ring having land flanked by concave sidewalls An oil control ring for a piston of an internal combustion engine has an annular body defining a central axis. The ring has a U-shaped cross-section formed of a centrally positioned web extending parallel to the axis and a pair of axially spaced rail port... | 12/02/2003 |
| 6378872 | Seal assembly In an annular groove carried by one of a pair of reciprocally movable members, a pin extending into the annular groove and a sidewall of the other one of the pair of reciprocally movable members, a seal assembly comprising a ring carried by an annular bod... | 04/30/2002 |
| 6283070 | Apparatus and method for sealing internal combustion engines An improved sealing means for internal combustion engines comprising a combination of a metal primary sealing ring positioned substantially within a groove on the piston, and a compliant secondary sealing ring positioned in the groove behind the primary c... | 09/04/2001 |
| 6206248 | Dispensing piston for commodity container A piston for dispensing material from a commodity container includes a nose section connected to a piston shaft. A recessed channel is located between the nose section and piston shaft. In the channel, there is a seal lifter over which a solid wiping seal... | 03/27/2001 |
| 5794941 | Piston ring assembly An improved piston ring assembly comprises a double-offset expander spring and a piston ring. The expander spring has a first wave portion that is continuously engaged in an annular groove of a piston body, the wave portion having an axial extent that is ... | 08/18/1998 |
| 4889351 | Hydraulic seal A seal for a hydraulic cylinder is disclosed and includes a static seal element and a dynamic seal element, the dynamic seal element having a continuous, annular form, the form being inscribable in an annular section of a truncated cone and having an anti... | 12/26/1989 |
| 4577874 | Seal assembly A two element, high and low pressure seal assembly to be used in a hydraulic or pneumatic sealing environment between two relatively movable machine parts, the seal assembly comprising a spring element, circular or rectangular in cross-section and made of... | 03/25/1986 |
| 4497497 | Oil ring assembly with annular expander spring An oil ring and coiled expander spring assembly in which the groove for the expander spring is of unique configuration and possesses a unique relationship with the expander spring.... | 02/05/1985 |
| 4473232 | Oil scraper ring with controlled gap arrangement In an oil scraper ring in which an expander is arranged on the inner peripheral surface of an oil scraper ring proper, the oil scraper ring is manufactured to present the configuration of a perfect circle in its unstressed state with a free engaging gap c... | 09/25/1984 |
| 4423800 | Shock absorber with improved compression valve mechanism An improved compression valve mechanism for a shock absorber comprising an upwardly facing annular valve seat on the shock absorber piston, an annular valve seat engaging member having an exterior periphery spaced closely from the interior periphery of th... | 01/03/1984 |
| 4210338 | Piston ring assembly A piston ring assembly for placement between a piston and a cylinder wall is provided. The assembly includes an annular expansion ring disposed around the piston, and an annular parted piston ring disposed around the expansion ring. A predetermined segmen... | 07/01/1980 |
| 4190259 | Single apex two element fluid pressure seal assembly A two element, high and low pressure seal assembly to be used in a hydraulic or pneumatic sealing environment between two relatively movable machine parts, the seal assembly comprising an anti-extrusion spring element illustrated as generally rectangular ... | 02/26/1980 |
| 4132417 | Pressure responsive sealing means A sealing device such as a piston ring has an L shaped cross section with primary and secondary sealing surfaces held in contact. The device is mounted in a groove to dispose the primary sealing surface against two relatively movable members and the secon... | 01/02/1979 |
| 4108448 | Piston ring assembly Disclosed is a piston ring including a spacer-expander spring member. In a preferred embodiment the ring is of cast iron and includes two axially spaced cylinder wall contacting lands. At least one generally rectangular inwardly facing spring receiving re... | 08/22/1978 |
| 3955823 | Oil ring assembly An oil ring assembly for internal combustion engine pistons including an annular split piston ring with an inner circumferential groove, a radially expandable split annular spring in the groove, and a bridging means in the groove spanning the gap between ... | 05/11/1976 |
