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| Number | Title | Issue Date |
| 7946034 | Method for manufacturing a tribological component A method for manufacturing an annular tribological component in the form of a seal or a sliding bearing of a brittle material. In order to attain the necessary sealing action even with a segmented construction, without expensive reprocessing being necessary in conne... | 05/24/2011 |
| 7421782 | Method for manufacturing internal combustion engine piston A method is provided for efficiently manufacturing a high quality internal combustion engine piston having an annular cavity allowing for good circulation of cooling fluid. An annular groove is formed at the circumferential edge of the top face of a piston crown, or... | 09/09/2008 |
| 7337539 | Method for production of a coolable annular support for internally cooled piston rings A method of producing a coolable annular support for internally cooled piston rings and comprising an annular body, a cooling channel plate and respective tubular bodies or plate-shaped bodies disposed on or in openings of the plate. End portions of legs of the cool... | 03/04/2008 |
| 7146724 | Method of Assembling an internal combustion engine This invention provides a method of assembling a modular internal combustion engine. The modular engine includes a cast crankcase having an open top and a closed bottom, a mid-plate, and an extruded cylinder bore block. A pre-assembled crankshaft with bearings, conn... | 12/12/2006 |
| 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 |
| 7003878 | Method for producing a ring support with a sheet metal cooling channel welded thereon The invention relates to a method for producing a ring support (1) with a sheet metal cooling channel welded thereon (5), which is transfused later with an aluminium melt for producing a piston. The aim of the invention is to improve the production of ... | 02/28/2006 |
| 6901782 | Method and apparatus for forming a modified a cross-section wire material A modified cross-section wire material is formed into piston rings such as oil-control rings for use in an engine. An apparatus of the present invention for forming the modified cross-section wire material has a forming unit (15) comprising in combination a n... | 06/07/2005 |
| 6598406 | Wave spring loaded split seal system A piston includes a circumferential groove having a seal ring and spring mounted within the groove. The spring exerts an axial force on the seal ring thereby preventing motion of the seal ring within the groove. Preferably, the spring in a wave spring, wh... | 07/29/2003 |
| 6408631 | Wave spring loaded split seal system A piston includes a circumferential groove having a seal ring and spring mounted within the groove. The spring exerts an axial force on the seal ring thereby preventing motion of the seal ring within the groove. Preferably, the spring in a wave spring, wh... | 06/25/2002 |
| 6283478 | Piston ring structural body and method of mounting the piston ring structural body The present invention provides a piston ring structural body composed of an outer ring continuously formed of a resinous material, an inner ring continuously formed of a resinous material and a ring tensile force applying member for pressing the outer rin... | 09/04/2001 |
| 6257590 | Sealing structure and method of mounting piston ring structural body for use in the sealing stucture The present invention provides a sealing structure employing a piston ring structural body of a type wherein an outer ring continuously formed of a resinous material is pressed radially outwards by a metal coil expander via a metal inner ring provided wit... | 07/10/2001 |
| 6134763 | Combined machining apparatus for making piston rings A combined machine tool for specific use in making a piston ring or the like from a workpiece is disclosed, in which on a common bed there are mounted: an outer and inner peripheral surface machining unit numerically controlled and having an outer periphe... | 10/24/2000 |
| 6053988 | Method for making piston rings A method and apparatus for making a piston ring in which a metal strip having a first coefficient of expansion is coiled about a special mandrel having a second greater coefficient of expansion and a threaded form that has a zero helix angle along most of... | 04/25/2000 |
| 6003227 | Process for manufacturing a piston ring A process for manufacturing a molded piston ring for a piston in a piston-cylinder unit from a material which can be molded in a master mold. The surfaces of the piston in contact with the piston ring are provided with a separating agent which substantial... | 12/21/1999 |
| 5852859 | Method and apparatus for making piston rings A method and apparatus for making non-circular piston rings which will precisely sealably conform to the cylinder wall of an internal combustion engine. In accordance with the method of the invention a metal strip of special cross-sectional configuration ... | 12/29/1998 |
| 5809643 | Method for making piston rings A method for making non-circular piston rings which will precisely sealably conform to the cylinder wall of an internal combustion engine. In accordance with the method a metal strip of special cross-sectional configuration is coiled about a specially con... | 09/22/1998 |
| 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 |
| 5673923 | Split seal ring made of synthetic resin having crossed diverging ends A a seal ring is made of a synthetic resin and has opposite ends. The seal ring has been imparted with shape-retentive property so that the seal ring is crossed at portions thereof located inside the opposite ends. The seal ring preferably has a smaller r... | 10/07/1997 |
| 5619795 | Method for designing an oil ring An oil ring set has an expander between upper and bottom side rails for a piston of a reciprocal internal combustion engine. The oil ring set has dimensions determined so as to have a thickness satisfying a first relationship between a radial thickness an... | 04/15/1997 |
| 5469616 | Method of manufacturing a side rail of a combined oil ring Each side rail of a combined oil ring, which includes a spacer-expander and two side rails, has an ion nitriding treatment layer on an outer peripheral surface of the rail. The inner peripheral surface of each rail may either be a bare surface or have eit... | 11/28/1995 |
| 5433001 | Method of producing piston ring A method of producing a piston ring to be incorporated in an internal combustion engine includes first nitriding surfaces of a steel base material in a high temperature range and then continuously nitriding in a low temperature range. Finally a porous lay... | 07/18/1995 |
| 5169162 | Piston ring having a function which is for facilitating supply of lubricating oil into an annular groove of a piston For carrying out lubrication between a piston (17) and a piston ring (21) installed in an annular groove (23) of the piston, the piston ring comprises a recessed portion (15a, 15b) which is partially recessed from an upper axial end (27) of the piston rin... | 12/08/1992 |
| 5113747 | High pressure piston sealing system and method of its assembly The present invention relates to a high pressure piston sealing system. More particularly, the present invention relates to a sealing system adopted for rigorous marine applications which prevent or inhibit the use of a seal lubricant.... | 05/19/1992 |
| 5068963 | Piston rings In the manufacture of a piston ring an intermediate ring is produced by bending a metal strip first to a smaller radius of curvature than required and then bending the metal strip again to increase its radius of curvature. The first and further bends are ... | 12/03/1991 |
| 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 |
| 5004249 | Flat gasket and process for its production A flat gasket, e.g. a cylinder head gasket of an internal combustion engine is described, which has through openings with metallic U-borders. The outer surface of at least one of the U-legs is provided with a structure that allows a residual quantity of a... | 04/02/1991 |
| 4986168 | Piston and multilayer piston ring set Compression piston ring for internal combustion or compressor cylinder and piston comprising double layer of segmented ring sectors having free form circumferential curvature matching the cylinder bore. The double layers are adapted to effectively seal or... | 01/22/1991 |
| 4937937 | Method for the manufacture of piston rings A method for the manufacture of piston rings from a metal strip, at least includes providing rings having a predetermined non-circular profile, by the metal strip being first bent to a uniform radius of curvature at least 2 percent less than the minimum r... | 07/03/1990 |
| 4531985 | Surface treatment of metal rings A metal ring of generally rectangular cross-section has its radially outer surface and its side surfaces treated by being stacked with its sides in contact with other rings in a chamber. Air is excluded from the chamber and a gaseous mixture of a carburiz... | 07/30/1985 |
| 4499643 | Process for manufacturing a piston ring A process for manufacturing a piston ring is disclosed wherein web-like first metal member which will form a base of a piston ring and web-like second metal member which will form a wear resistant layer of the piston ring are separately fed and joined tog... | 02/19/1985 |
| 4497102 | Process for manufacturing a piston ring A process for manufacturing a piston ring is disclosed wherein web-like first metal member which will form a base of a piston ring and web-like second metal member which will form a wear resistant layer of the piston ring are separately fed and joined tog... | 02/05/1985 |
| 4465515 | Piston ring for internal combustion engine To provide piston rings which are ductile, can be heavily thermally loaded, and are not attacked by corrosive residues occurring upon combustion of residual oil or other sulfur-containing heavy Diesel oils, a powder mixture is sintered in an isostatic hot... | 08/14/1984 |
| 4336077 | Method of cryogenically hardening an insert in an article A method of cryogenically hardening and expanding an insert in an article is disclosed. Particularly, gray iron piston ring insert (14) having an austenitic matrix is treated in a piston body (12) by impinging a cryogenic medium thereon. This changes the ... | 06/22/1982 |
| 4247972 | Method of manufacturing a piston ring A parted annular piston sealing ring and a method for manufacture thereof wherein an inwardly facing ring surface adapted to be engaged by an expander-spring for expanding the ring into sealing engagement with a cylinder wall is hardened in a zone immedia... | 02/03/1981 |
| 4182014 | Method of making a spacer-expander spring for a 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... | 01/08/1980 |
| 4173878 | Method of manufacturing tangential expanders for oil control piston rings According to the claimed method a round wire is first flattened and then formed into a serpentine flat spring. The segment portions of this spring are bent up in the form of thrust shoulders and calibrated for height. The shaped spring is coiled into a sp... | 11/13/1979 |
| 4133927 | Composite material made of rubber elastomer and polytetrafluoroethylene resin A composite material including a rubber elastomer substrate and a polytetrafluoroethylene resin film or sheet having a porosity of 20 to 95% by volume and being laminated on at least one portion of the rubber elastomer substrate. In one preferred embodime... | 01/09/1979 |
| 4023248 | Method of assembling apex seal means in rotary piston engines In rotary piston engines including apex seals each comprising a main body constituting a substantial part of the seal, an end piece disposed in abutting relationship to an end of the main body through slanted cam surfaces which serve to force the end piec... | 05/17/1977 |
| 3973098 | Piston ring forming method A method and apparatus for forming piston rings are disclosed. A split piston ring made by conventional processes is locally heated along its inside surface for a short distance either side of the split. This causes a short length of the ring on either si... | 08/03/1976 |
