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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 |
| 7318963 | Composite chromium plating film and sliding member having the same and method for manufacture thereof A composite chromium plating film containing hard particles in network-shaped microcracks, a surface-occupying ratio of the microcracks being 10 to 20% by area, a distribution density of the microcracks being 1,200 to 2,500/cm, and the amount of the above hard parti... | 01/15/2008 |
| 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 |
| 7237761 | Valve having double wound lamellar ring The present invention is directed to a valve which includes a housing having a valve seat for a flap that is rotationally mounted on a drive shaft. A double wound lamellar ring is arranged outside and around the flap in a peripheral groove of the flap. The invention... | 07/03/2007 |
| 7210397 | Scotch yoke engine A scotch yoke type fluid device where the or each piston (32) has its own slider (18) and its own pair of sliding surfaces (30) disposed on the same side of the big end bearing (16) of the crank (12). The main crank axis (14... | 05/01/2007 |
| 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 |
| 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 |
| 7073611 | Ion-beam assisted deposition of inorganic coatings for elastomeric seal wear resistance improvement Elastomeric seals for use in drill bits on which an inorganic surface modification material has been deposited onto the surface of the elastomeric seals. Wear resistance of the seal at the dynamic surface is improved by providing support for the soft seal surface, b... | 07/11/2006 |
| 7052018 | Piston ring having wear resistant composition The invention discloses a piston ring comprising a piston ring substrate. The piston ring substrate comprises at least 50 volume %, of at least one intermetallic alloy, based on the total volume of the wear-resistant composition. The invention further relates to a p... | 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 |
| 6726216 | Piston ring with oxide-nitride composite layer A piston ring for use in a cylinder of an internal combustion engine, which ring is nitride-hardened at least on the sliding surface between piston ring and cylinder wall. The nitride layer is composed of a precipitated layer and a compound layer, wherein the piston... | 04/27/2004 |
| 6703145 | Process for electrolytic coating of a substrate and product produced The present invention relates to a process for electrolytic coating of a substratum, especially a piston ring, with a ceramic chrome layer, the substratum being arranged at an electrode connected to voltage and chromium ions for coating the substratum bei... | 03/09/2004 |
| 6631907 | Nitride-plated piston ring for internal combustion engines According to an embodiment of the present invention a piston ring for internal combustion engines for use with a piston and a cylinder, is provided that has an external circumferential sliding surface adapted to slid against the internal wall of the cylin... | 10/14/2003 |
| 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 |
| 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 |
| 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 |
| 6213474 | Piston ring and combination of compression rings According to an aspect of the present invention, a piston ring for use in internal combustion engines is provided that is made of matensite-based stainless steel material containing C of not less than 0.4 and not more than 0.8 weight percent, Si of not le... | 04/10/2001 |
| 6161837 | Piston ring with hybrid face coating An improved piston ring is disclosed, together with a process form making the ring. An annular steel base body has a lower layer formed by electro-plating a peripheral surface of the body with either a chromium or titanium nitrided gas. The ring is normal... | 12/19/2000 |
| 6149162 | Sliding member A gas nitrided layer is formed over the entire surface of a piston ring. A physical vapor deposition film of CrN is formed over the gas nitrided layer at the outer circumferential surface. The physical vapor deposition film has oxygen contained in a solid... | 11/21/2000 |
| 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 |
| 6060182 | Hard coating material, sliding member covered with hard coating material and manufacturing method thereof A hard film is covered on the outer circumferential surface of a piston ring by means of an arc ion plating. The hard film has a mixture of crystal structure of CrN and crystal structure of Mo2 N containing oxygen in a solid solution state, and... | 05/09/2000 |
| 6054225 | Composite chromium plating film and sliding member covered thereof A piston ring is 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... | 04/25/2000 |
| 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 |
| 5718437 | Combined oil ring with spacer/expander having Cr2 N coating thereon A combined oil ring is comprised of paired upper and lower side rails, and a spacer expander. The side rails are made of martensitic stainless steel and are subjected to gas nitriding. The spacer expander is made of austenitic stainless steel, with a subs... | 02/17/1998 |
| 5601293 | Sliding member with hard ternery film A hard film is formed on the outer circumferential surface of a piston ring by means of a physical vapor deposition process. The hard film is a ternary film comprising molybdenum, chromium, and 4 to 22 percent nitrogen by weight, and includes at least mol... | 02/11/1997 |
| 5582414 | Sliding member and method for manufacturing the same An under coating 2 and a hard film 3 are formed on the outer circumferential surface of a piston ring 1 by an ion plating process. The under coating 2 is composed of at least one of Cr, Cr2 N, and CrN. The hard film 3 is composed of a hard coat... | 12/10/1996 |
| 5039116 | Composite oil-ring A composite oil-ring comprising an oil control ring disposed on a lower surface of an oil-ring groove, a seal ring disposed on the oil control ring and having substantially no oil path in the radial direction thereof, and a spring seal ring disposed betwe... | 08/13/1991 |
| 4941669 | Fiber-reinforced piston ring for internal combustion engine A fiber-reinforced piston ring for an internal combustion engine comprised of composite body of reinforcing fiber which is long carbon fibers oriented in a peripheral direction of the piston ring and having a fiber volume fraction in a range of 5% to 60% ... | 07/17/1990 |
| 4876158 | Piston ring having a wear resistant surface layer There is disclosed a wear resistant surface layer composed of 40 to 70 wt. % cobalt or cobalt base alloy as binder and the balance is substantially chromium oxide particles.... | 10/24/1989 |
| 4817578 | Internal combustion engine An internal combustion engine having a cylinder block made of a light-alloy with a cylinder wall around a cylinder bore including a cylindrical fiber-reinforced portion which is formed of a mixture of an alumina-based fiber and a carbon fiber with a light... | 04/04/1989 |
| 4612260 | Piston ring member A piston ring having an improved wear resistance and antiseizure properties and good workability is disclosed. The piston ring is made of a martensite stainless steel comprising from 0.4 to 0.7 wt % C, 0.3 to 1.0 wt % Si, 0.5 to 1.0 wt % Mn, and 2.0 to 9.... | 09/16/1986 |
| 4548416 | Oil-ring including two rail rings and an expander-spacer ring which bites into the rail ring A composite oil-ring comprises a pair of rail rings and an expander-spacer ring. The expander-spacer ring is laterally extending U-shaped in cross section providing rail supporting legs and an inwardly open channel between the legs of the U. The expander-... | 10/22/1985 |
| 4420543 | Bearing member of an internal combustion engine, having a flame sprayed surface In a bearing member of an internal combustion engine, having a flame sprayed surface, molybdenum or tungsten carbide is known as the material of the flame spray. The present invention aims to provide, for example a flame-sprayed piston ring with good heat... | 12/13/1983 |
| 4359230 | Piston ring with wear resistant coating A piston ring for use in a reciprocating internal combustion engine or in a compressor. The ring has an outer peripheral surface provided with a rotary finish machined curved center portion, rotary finished machined chamfer edges and a final finish plated... | 11/16/1982 |
