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| Number | Title | Issue Date |
| 7354045 | Oil ring It is a main object of the present invention to provide an oil ring which is capable of reducing sliding friction even in a high speed revolution region of a piston, and capable of reducing the consumption of oil. To achieve the object, the present invention provide... | 04/08/2008 |
| 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 |
| 7140291 | Oil-free/oil-less air compressor with an improved seal An oil-free/oil-less air compressor with a piston positioned for reciprocating in a bore, the piston having a first piston ring assembly made from a rigid, high temperature polymer, and a second piston ring assembly comprising a first portion that engages the bore, ... | 11/28/2006 |
| 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 |
| 6959930 | Combination oil scrapper ring/gas seal assembly A ring assembly, including a first oil scraper ring, a center oil scraper ring and a gas seal ring, adapted for disposition in a single groove of a packing cup which can be stationarily mounted over and around a reciprocally movable piston rod of a gas compressor. T... | 11/01/2005 |
| 5788246 | Seal device for piston rod A piston seal device has a combined oil scraping ring that includes a steel annular oil scraping ring body having an M-, I- or H-shaped cross section, and an annular coil spring. The ring body has a cross-sectional cut at one location and includes an uppe... | 08/04/1998 |
| 5651553 | Antirotation structure for combined oil ring A combined oil ring comprises an oil ring and a coil expander. A curved bar passes through paired end portions of the coil expander. An antirotation member comprises a portion to be inserted into a hole and a portion to be held. Two mutually parallel surf... | 07/29/1997 |
| 5411609 | Section steel wire of oil ring A section steel wire for an oil ring for use in an internal combustion engine, consisting essentially of, by weight, 0.6 to 1.5% carbon, not more than 1.5% Si, not more than 1.5% Mn, more than 20% and not more than 25% Cr, and optionally containing at lea... | 05/02/1995 |
| 5064206 | Piston ring An oil control piston ring is described comprising a pair of axially spaced apart side rails, the side rails each having a radially outer periphery forming a rubbing face with a co-operating cylinder wall, an expander having portions which lie between the... | 11/12/1991 |
| 4796898 | Oil scraper piston ring with elliptical oil vent holes Oil scraping piston ring of profiled steel having punched-in oil vent holes. To keep at a minimum the bulging at the holes developed during coiling, the oil vent holes are given an elliptical or rhombic outline.... | 01/10/1989 |
| 4629200 | Non-metallic piston rings with controlled expansion pressure A piston ring formed from a plastics material and having a maximum pressure against the associated cylinder of between 0.10 and 1.50 MN/m2 and preferably 0.50 MN/m2. One possible material for such piston rings is polyetheretherketone... | 12/16/1986 |
| 4582328 | Double acting stirling engine piston ring A piston ring design for a Stirling engine wherein the contact pressure between the piston and the cylinder is maintained at a uniform level, independent of engine conditions through a balancing of the pressure exerted upon the ring's surface and thereby ... | 04/15/1986 |
| 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 |
| 4422649 | Stirling engine piston ring A piston ring design for a Stirling engine wherein the contact pressure between the piston and the cylinder is maintained at a uniform level, independent of engine conditions through a balancing of the pressure exerted upon the ring's surface and thereby ... | 12/27/1983 |
| 4331065 | Engine piston assembly with improved oil control An engine piston and ring assembly providing improved oil control and where applicable sealing of scavenging air. In a preferred embodiment applicable to two-cycle port scavenged diesel engines and similar applications, the piston is provided with dual oi... | 05/25/1982 |
| 4214762 | Rolled metal piston ring A rolled steel oil control piston ring for internal combustion engines is of generally U-shaped cross section with a pair of opposed rigid sidewalls projecting inwardly of the ring from a central peripheral wall thereof. A pair of flat-faced solid scraper... | 07/29/1980 |
| 4192051 | Method for manufacturing fully sealed piston ring For fabricating a compression piston ring, two identical split-ring members are formed, each having parallel planar side faces and a cylindrical outer edge face. For each ring member, circumferentially overlapping fingers are formed at the adjoining ends,... | 03/11/1980 |
| 4103594 | Piston and scraper ring assembly A piston is formed with a peripheral groove for receiving a scraper ring, and an annular, axially extending recess is formed in the face of the scraper ring groove on the side thereof toward the piston crown and adjacent the piston wall, with the recess t... | 08/01/1978 |
| 4079949 | Integral spring piston ring A one-piece annular oil control piston ring for internal combustion engines is adapted to be received with a peripheral groove in a piston. The ring is of generally U-shaped cross section defined by a pair of opposed sidewalls which project inwardly of th... | 03/21/1978 |
