Class / Patent application number | Description | Number of patent applications / Date published |
277440000 | Piston ring surface of dissimilar material or hardness | 85 |
20140319778 | GASKET DEVICE FOR PRE-FILLED SYRINGE - A gasket device is for use in a pre-filled syringe having a cylinder for containing liquid drug in sealing tightness. The liquid drug is pressurized by moving a plunger in the cylinder. The gasket device includes a gasket body, having resiliency, and movable toward the liquid drug with a front end of the plunger. A laminate layer is formed from PTFE (polytetrafluoroethylene), and disposed to cover a surface of the gasket body. The laminate layer includes a sealing portion, having a thickness Da, for sliding on an inner surface of the cylinder in sealing tightness. A liquid receiving portion has a thickness Db, for contacting the liquid drug in the cylinder. The thickness Da is from 10 microns to 40 microns. The thickness Db is from 20 microns to 50 microns. A ratio R1 of the thickness Db to the thickness Da is from 1.25 to 2.00. | 10-30-2014 |
277442000 | Surface coating, plating, or impregnation | 84 |
20090001669 | Sliding Element, in Particular Piston Ring, Method for Manufacturing a Sliding Element, Sliding System and Coating for a Sliding Element - A sliding element comprises at least one surface for sliding contact with a running face, wherein a wear layer and a run-in layer made from carbon are applied to the surface, and is characterized in that the run-in layer comprises hydrogen and nanocrystalline carbide phases. In a method for manufacturing a sliding element, the run-in layer is applied by means of a PVD process. A sliding system has an above-described sliding element and a body having a running face. A coating for a sliding element comprises a wear layer which can be applied to the upper side of the sliding element, and a run-in layer which is configured as a carbon layer, and is characterized in that the run-in layer comprises hydrogen and nanocrystalline carbide phases. | 01-01-2009 |
20090051123 | PISTON RING - A piston ring includes a piston ring body and a surface coating film formed on at least one of upper and lower surfaces of the piston ring body. The surface coating film has a most outside surface layer including a heat-resistant resin and a metal powder contained in the heat-resistant resin and a base bottom layer formed nearest the piston ring body and including a heat-resistant resin. The base bottom layer may also include a metal powder. | 02-26-2009 |
20090058014 | PISTON RING - There is provided a piston ring which can effectively prevent aluminum adhesion phenomenon to the piston ring. The piston ring includes a piston ring main body and a surface coating film on either upper or lower surface of the piston ring main body, or both the upper and lower surfaces of the piston ring. The surface coating film includes heat-resistant resin and copper based powder contained therein. | 03-05-2009 |
20090174150 | LATERAL SIDE PROTECTION OF A PISTON RING WITH A THERMALLY SPRAYED COATING - A piston ring is disclosed that includes a radially extending upper surface, a radially extending lower surface, a radially innermost surface extending between the upper surface and the lower surface, and a radially outermost surface extending between the upper surface and the lower surface. The lower surface includes a thermally sprayed coating, and both the radially outermost surface and the upper surface lack the coating. Accordingly, the thermally sprayed coating may generally be applied solely to the lower radially extending surface of the ring. | 07-09-2009 |
20090278320 | Piston ring with chromium nitride coating for internal combustion engines - The invention relates to a piston ring for internal combustion engines, the piston ring comprises a steel or cast iron base material with a coating of chromium nitride deposited by a physical vapor deposition process on a sliding surface of the piston ring, wherein the coating is composed of a columnar crystal structure of CrN with the following features:
| 11-12-2009 |
20100019457 | PISTON RING - A piston ring having a base body, which comprises a running surface provided with at least one chamber, an upper and a lower flank surface, and an inner circumferential surface, wherein the running surface is provided with at least one PVD layer such that the same is adjusted to the contour of the running surface without completely filling the chamber, wherein the respective edge region is provided with a layer thickness, b that is reduced compared to the layer thickness, a of the chamber as a function of the configuration of the chamber. | 01-28-2010 |
20100044967 | PISTON RING - The invention relates to a piston ring, having a base body, which comprises a running surface provided with a chamber, an upper and a lower flank surface, and an inner circumferential surface, wherein at least the chamber is provided with at least one wear protection layer, and a PVD cover layer is applied to the running surface at least in some regions such that the base body has the PVD cover layer only in the edge regions, which is to say outside of the chamber, in the finished state. | 02-25-2010 |
20100140880 | PISTON RING - A piston ring mounted in the ring groove of an aluminum alloy piston does not cause aluminum adhesion during the long-term use. The piston ring includes a resin film deposited on at least one of an upper face and a lower face. The resin film contains from 0.5 to 20% by volume of carbon black particles and from 3 to 30% by volume of solid lubricant particles with respect to the total volume of the resin film. The carbon black particles preferably contain one or both of graphitized carbon black particles and composite graphite black particles. | 06-10-2010 |
20110101620 | PISTON RING - A piston ring with a DLC coating comprises an adhesive layer on a base material from inside to outside, an amorphous metallic hydrocarbon layer and an amorphous non-metallic hydrocarbon layer, wherein primarily sp | 05-05-2011 |
20110140367 | NOVEL COATING HAVING REDUCED STRESS AND A METHOD OF DEPOSITING THE COATING ON A SUBSTRATE - A method of depositing a coating on a substrate, the method comprising the steps of: (a) depositing material on a substrate by performing a cathodic vacuum arc (CVA) deposition step; and (b) depositing material on a substrate by performing a physical vapor deposition (PVD) step that excludes CVA deposition wherein the thickness of the material deposited in step (a) is greater than the thickness of material deposited in step (b). | 06-16-2011 |
20110309586 | COMPRESSION PISTON RING - A compression piston ring for an internal combustion engine, comprising a sliding surface formed by two ridges, upper and lower flank surfaces, and an inner circumferential surface, wherein the lower ridge runs at least in some regions parallel to the counter sliding surface and the upper ridge is designed as a taper faced Napier element. | 12-22-2011 |
20120068418 | GLIDING ELEMENT - The invention relates to a gliding element of an internal combustion engine, especially a piston ring, having a DLC coating of the ta-C type which has at least one residual stress gradient. | 03-22-2012 |
20120126487 | SLIDING MEMBER HAVING A THERMALLY SPRAYED COATING AND METHOD FOR PRODUCING SAME - A sliding member for an internal combustion engine includes: a substrate and a coating obtainable by thermally spraying a powder, having the element proportions of 55 to 75 wt % of chromium, Cr; 3 to 10 wt % of silicon, Si; 18 to 35 wt % of nickel, Ni; 0.1 to 2 wt % of molybdenum, Mo; 0.1 to 3 wt % of carbon, C; 0.5 to 2 wt % of boron, B; and 0 to 3 wt % of iron, Fe. | 05-24-2012 |
20120205875 | SLIDING ELEMENT, IN PARTICULAR A PISTON RING, HAVING A COATING - The invention relates to a sliding element, such as a piston ring, having a coating on at least one running surface, which comprises, from the inside out, an adhesive layer ( | 08-16-2012 |
20120205876 | PISTON RING - A piston ring is provided at its outer periphery with a sliding surface, wherein in a cross section thereof which is perpendicular to a radial direction of the piston ring, the sliding surface includes a first sliding surface which occupies a predetermined region from one end thereof, and a second sliding surface which occupies a region extending from one end to the other end of the first sliding surface, the first sliding surface is formed of hard film, the second sliding surface is not formed of hard film, and the second sliding surface exists at a position deviated inward from a phantom line extending from the first sliding surface toward the other end. | 08-16-2012 |
20120235359 | OIL RING FOR INTERNAL COMBUSTION ENGINE - An oil ring for an internal combustion engine is provided that can prevent adhesion and deposition of oil sludge even during long-time operation of the engine, can thereby prevent the occurrence of sticking of the oil ring components to each other, and can maintain a good oil control function. At least part of the surface of the oil ring for an internal combustion engine is coated with a metal coating having a surface free energy of 40 mJ/m | 09-20-2012 |
20120306158 | SLIDING ELEMENT HAVING ADJUSTABLE PROPERTIES - A sliding element, particularly a piston ring for an internal combustion engine, includes a substrate, and a wear-protection layer, obtained by thermal spraying of a powder comprising the element proportions
| 12-06-2012 |
20130113164 | PISTON RING WITH A WEAR-RESISTANT COBALT COATING - A piston ring is provided having a bottom surface, a top surface, an inner diameter surface and at least one running surface. A wear protection coating substantially entirely of cobalt is applied to the at least one running surface to protect the base material of the piston ring. Specifically, during operation of an engine, the more durable cobalt wear resistant coating, not the base material which may be steel or cast iron, is in sliding contact with a cylinder wall. The cobalt coating may be applied through, for example, electrodeposition or plasma spraying. | 05-09-2013 |
20130140776 | SLIDING ELEMENT, IN PARTICULAR PISTON RING, HAVING A COATING AND PROCESS FOR PRODUCING A SLIDING ELEMENT - A sliding element, in particular piston ring, has on at least one running surface, from the inside outwards, a coating having a metal-containing adhesive layer and a ta-C type DLC layer with a thickness of at least 10 μm. | 06-06-2013 |
20130181409 | PISTON RING HAVING A THERMALLY SPRAYED COATING AND METHOD FOR PRODUCING SAME - A method for producing a piston ring for an internal combustion engine includes providing, a substrate and applying a coating by means of thermal spraying of a powder including solid lubricants on the substrate, having the elemental proportions of 15-30% by weight of iron, Fe; 15-30% by weight tungsten, W; 25-35% by weight of chromium, Cr; 10-35% by weight of nickel, Ni; 1-5% by weight of molybdenum, Mo; 0.2-3% by weight of aluminum, Al; 3-20% by weight of copper, Cu; 1-10% by weight of carbon, C; 0.1-2% by weight of sulfur, S; and 0.1-2% by weight of silicon, Si. The resultant piston ring and coating are also provided. | 07-18-2013 |
20130187340 | METHOD FOR PRODUCING A PISTON RING - A piston ring is produced by providing a metallic main body, at least including a radially outer running surface, a radially inner circumferential surface and upper and lower flank surfaces interposed therebetween, with a defined taper in the region of an approximately cylindrical running surface, providing at least the running surface with at least one wear-resistant layer, and removing the at least one wear layer in the region of the entire circumference of the ring that forms a scraping edge forming a land having a predefinable width. | 07-25-2013 |
20130187341 | METHOD FOR PRODUCING A PISTON RING - Method for producing a piston ring having an axial height <2 mm, said piston ring having a radially outer running surface provided with at least one rail, a radially inner circumferential surface, and upper and lower flank surfaces extending therebetween, wherein said rail is provided with a contour that is tapered radially outwardly, thereafter the running surface, together with the flanks of the tapered rail, is provided with at least one wear-resistant layer, and then only the flank of the rail that is to form a scraping edge is subjected to at least partial material removal to form the scraping edge. | 07-25-2013 |
20130200572 | VEHICLE PISTON RING HAVING A NANO MULTI-LAYER COATING - The present disclosure provides a vehicle piston ring having a multi-layer coating. The vehicle piston ring includes a Cr or Ti buffer layer, a CrN or Ti(C)N intermediate layer, a first TiAlN/CrN nano multi-layer, and a second TiAlCN/CrCN nano multi-layer. The Cr or Ti buffer layer is coated over the base material of the piston ring. The CrN or Ti(C)N intermediate layer is coated over the Cr or Ti buffer layer. The first TiAlN/CrN nano multilayer is coated over the CrN or Ti(C)N intermediate layer. The second TiAlCN/CrCN nano multilayer is coated over the first TiAlN/CrN nano multilayer as an outermost surface layer. | 08-08-2013 |
20130214493 | VEHICLE PISTON RING HAVING MULTI-LAYER COATING - Disclosed is a piston ring having a multi-layer coating. The piston ring includes a buffer layer, a intermediate layer, a TiAlN/CrN nano multilayer, and a TiAlCN layer. The buffer layer is coated over a base material of a piston ring. The intermediate layer is coated over the buffer layer. The TiAlN/CrN nano multilayer is coated over the intermediate layer. The TiAlCN layer is coated over the TiAlN/CrN nano multilayer as an outermost surface layer. | 08-22-2013 |
20130241154 | PISTON RING FOR ENGINE - Disclosed is a piston ring for engine that includes chromium (Cr) coating layer coated on the surface of a base material of the piston ring of an engine; a chromium nitride (CrN) coating layer; and a silicon-incorporated diamond-like carbon (Si-DLC) coating layer, which is formed on the CrN coating layer, and contains Si component of about 3˜10 at %, and a method for manufacturing thereof. | 09-19-2013 |
20130334773 | Structure of Piston Ring - A structure of a piston ring to be installed in an engine includes a matrix wherein a laminated intermediate layer is formed on a surface of the matrix from hard chromium (Cr), chromium nitride (CrN) and titanium carbide (TiC) in order, and a diamond-like carbon film (DLC) is coated on an outer periphery of the intermediate layer, so that the piston ring is wrapped by a skin with a progressive structure having gradient distribution of hardness. The structure formed from the diamond-like carbon film provides low wear rate and low friction coefficient, while applying a high bonding force to the matrix and making the piston ring have an improved normal service life that meets the related environmental regulations. | 12-19-2013 |
20140021686 | MULTI-PIECE OIL RING - A multi-piece oil ring is provided in which, even after long-term operation of an engine, adhesion and deposition of oil sludge are prevented, sticking of components does not occur, and a high oil control function can be maintained. The multi-piece oil ring includes a spacer expander and a pair of upper and lower side rails supported by the spacer expander. To achieve the above features, at least side faces of the side rails that face the spacer expander are coated with a fluorine-containing coating, and the spacer expander is coated with a metal coating. The angle of contact (θ | 01-23-2014 |
20140125013 | PISTON RING - A high-thermal-conductivity piston ring having excellent scuffing resistance and wear resistance, which can be used in a high-heat-load environment in engines is provided. Also, to provide a piston ring with low friction for contributing to the improvement of fuel efficiency, a TiN coating as thick as 10-60 μm, in which the texture coefficient of a (111) plane is 1.2-1.65 in X-ray diffraction on the coating surface, with the texture coefficient of a (111) plane>the texture coefficient of a (220) plane>the texture coefficient of a (200) plane, is formed under the optimized ion plating conditions on a peripheral surface of the piston ring. Further, to obtain excellent sliding characteristics with low friction without losing excellent thermal conductivity of TiN, a hard amorphous carbon coating is formed on the TiN coating. | 05-08-2014 |
20150061231 | PISTON RING FOR INTERNAL COMBUSTION ENGINE - An object of the present invention is to provide a piston ring for an internal combustion engine capable of preventing aluminum cohesion for a long time under high temperature and high load conditions. Specifically, a piston ring 1 for the internal combustion engine including a piston ring base material 11 coated with an aluminum cohesion resistant film 12, wherein the aluminum cohesion resistant film 12 is made of ceramics coated on at least one of an upper side face 11 | 03-05-2015 |
20150091255 | PISTON RING AND METHOD FOR THE PRODUCTION THEREOF - A piston ring for pistons of internal combustion engines, comprising a ring running surface coated with a coating agent, a ring back, and two ring abutting ends spaced apart by a gap. In the region of at least one of the ring abutting ends, a groove running in the circumferential direction is provided in the ring running surface, the groove being filled up with the coating agent such as to be flush with the coated ring running surface. | 04-02-2015 |
20150130143 | METHOD FOR PRODUCING AN OIL SCRAPER PISTONG RING - An oil scraper piston ring and a method for producing it in which a base body is provided with a running surface profile by machining the radially outer circumferential surface thereof, the running surface profile including two running surface lands and an interposed groove, wherein the running surface profile corresponds to that of the finished oil scraper piston ring, and on the groove side, seen in the circumferential direction, drainage holes are introduced into the groove base, at least the running surface lands are provided with a wear-resistant PVD, DLC or TaC layer and, if needed, the wear-resistant layer is subjected to a polishing, honing or lapping operation. | 05-14-2015 |
20150137457 | PISTON RING - A piston ring which is provided with a carbon-based coating which has a low friction property and wear resistance, that is, a piston ring which has a carbon-based coating formed over its sliding surface, in which piston ring, the coating is a multilayer coating comprised of two types of layers having different hardnesses laminated in at least two layers, a hardness difference between the two types of layers is 500 to 1700 HV, a high hardness layer has the same or greater thickness than a low hardness layer, and the coating as a whole has a thickness of 5.0 μm or more. The high hardness layer has a thickness of 5 to 90 nm. The surface on which the coating is formed has a base material roughness of 1.0 μmRz or less. | 05-21-2015 |
20150292622 | SLIDING ELEMENT, IN PARTICULAR A PISTON RING, HAVING A COATING - The present application relates to a sliding element, in particular a piston ring, having at least one sliding surface which has a coating which has, from the inside outwards, a metal-containing bonding layer and a DLC layer, where the DLC layer is an amorphous hydrogen-free diamond-like carbon layer which has a DLC main layer which extends from the bonding layer to an adjoining DLC covering layer and has a carbon content of more than about 98.5 at %, oxygen and/or hydrogen and/or nitrogen in a proportion of in each case less than about 0.5 at % and an sp2/sp3 ratio of the carbon in the range from about 1 to about 3, and a DLC covering layer which extends from the DLC main layer to the surface of the sliding element and has a lower carbon content and/or higher oxygen content and/or higher hydrogen content compared to the main layer and also metals and/or metal oxides and an sp2/sp3 ratio of the carbon in the range from about 1 to about 3. | 10-15-2015 |
20150354702 | PISTON RING FOR INTERNAL COMBUSTION ENGINES WITH INCREASED FATIGUE STRENGTH, AND METHOD FOR PRODUCING SAME - A piston ring ( | 12-10-2015 |
20150362071 | SLIDING ELEMENT, IN PARTICULAR A PISTON RING, HAVING A COATING - The invention relates to a sliding element, in particular a piston ring, having at least one running surface. The running surface comprises a coating, which from the inside to the outside has at least one first adhesive layer, a hard hydrogen-free DLC layer, a second adhesive layer, a soft hydrogen-containing, metal and/or metal carbide-containing DLC layer, which is softer than the hard hydrogen-free DLC layer, and a hard hydrogen-containing DLC layer, which is harder than the soft hydrogen-containing, metal and/or metal carbide containing DLC layer. | 12-17-2015 |
20160169387 | PISTON RING AND METHOD FOR MANUFACTURING SAME | 06-16-2016 |
20160178054 | PISTON RING AND METHOD OF PRODUCING THE SAME | 06-23-2016 |
20180023703 | PISTON RING AND MANUFACTURING METHOD | 01-25-2018 |
277443000 | Nitrided | 29 |
20090026712 | Sliding Member - A sliding member is characterized in that a sliding surface of the sliding member is coated with an amorphous hard carbon film, and a surface of the amorphous hard carbon film has a ten-point mean roughness of equal to or less than 0.7 micrometers and an initial wear height in a range of 0.07 to 0.14 micrometers. | 01-29-2009 |
20100001474 | Piston ring with sulphonitriding treatment - The present invention relates to a piston ring for an internal combustion engine, the piston ring comprises a sulphide rich compound layer forming a surface layer, said sulphide rich compound layer comprising an iron nitride matrix with iron sulphide (FeS) inclusions embedded in said matrix, said sulphide rich compound layer having a sulphur content of 1 to 4 wt % S and a nitrogen content of 10 to 20 wt % N. | 01-07-2010 |
20100019458 | PISTON RING - A piston ring, having a base body, which comprises a substantially circumferential running surface, an upper and a lower flank surface, and an inner circumferential surface, wherein the transitional region of the running surface is provided with an edge ≦0.1 mm in the lower flank surface, and the running surface is provided with at least one PVD cover layer ≦10 μm. | 01-28-2010 |
20100044968 | PISTON RING FOR INTERNAL COMBUSTION ENGINES - The invention relates to a piston ring which is produced from a carrier material, especially steel or a cast material. The piston ring has a wear-resistant coating from a periodic multilayer system, every periodicity consisting of at least two individual metal nitride layers. Adjacent individual layers within the periodicity have different metallic elements. The thickness of an individual layer is ≧15 nm. | 02-25-2010 |
20100044969 | PISTON RING FOR INTERNAL COMBUSTION ENGINES - The invention relates to a piston ring which is produced from a carrier material, especially steel or a cast material. The piston ring has a wear-resistant coating from a periodic multilayer system, every periodicity consisting of at least two individual metal nitride layers. The multilayer system has superlattice structures, the thickness of an individual layer being ≧2 nm to <15 nm and the thickness of the multilayer system being >4.5 μm and adjacent individual layers within the periodicity having different metallic elements. | 02-25-2010 |
20100117304 | PISTON RING - A piston ring, having a base body, which comprises a substantially circumferential running surface, which has an upper and a lower flank surface, an inner circumferential surface, and a butt opening provided with defined butt clearance, wherein the transition of the running surface butt edge into the respective butt surface is configured as a sharp edge, and the running surface is provide with at least one PVD cover layer ≦10 μm at least up to the respective running surface butt edge. | 05-13-2010 |
20100187765 | PISTON RING - In order to avoid burn traces on piston rings, it is proposed to provide the piston ring with a wear-protection coating which consists of a material with a thermal conductivity of at least 180 W/(m.K). At least 5% vol. of the wear-protection coating consists of aluminum nitride. | 07-29-2010 |
20100253006 | STEEL PRODUCTS FOR PISTON RINGS AND PISTON RINGS - A steel product having a composition which contains by mass C: 0.01 to 1.9%, Si: 0.01 to 1.9%, Mn: 5.0 to 24.0% with balance consisting of Fe and unavoidable impurities and a steel product described above which further contains Cr: 18.0% or below and/or Ni: 12.0% or below in addition to the above essential elements. The above steel products may each further contain Al: 1% or below and/or N: 0.3% or below and the above steel products may each further contain one or more elements selected from among Nb, Ti, Zr, Mo and Cu in a total amount of 4.0% or below. The steel products can sufficiently follow the thermal expansion of a cylinder made of an aluminum alloy and thus enables the production of a piston ring which is suitable for use as a piston ring to slide on the inner face of a cylinder bore made of an aluminum alloy in an internal combustion engine and which can retain excellent sealing properties. | 10-07-2010 |
20100295251 | CHROMIUM NITRIDE ION-PLATING COATING AND ITS PRODUCTION METHOD, AS WELL AS PISTON RING USED FOR INTERNAL COMBUSTION ENGINE - [Task] The chromium nitride ion-plating coating has a property that it is hard but is liable to peel off. Year by year, the required level of wear resistance and scuffing resistance becomes higher in a diesel engine. The property of a coating is improved to enhance the wear resistance and scuffing resistance and also to improve resistance against peeling off. | 11-25-2010 |
20110148047 | Piston Ring For Internal Combustion Engine - The present invention refers to a piston ring for internal combustion engine, having an outer surface of a coating of Chromium Nitride (CrN and Cr | 06-23-2011 |
20120091663 | Nitriding Grade Steel Material Composition for Manufacturing Piston Rings and Cylinder Liners - A steel material composition in particular for manufacturing piston rings and cylinder liners, which has a good nitriding capability, contains the following elements in the given proportion related to 100% by weight of the steel material composition: 0.5-1.2% by weight C, 4.0-20.0% by weight Cr, 45.30-91.25% by weight Fe, 0.1-3.0% by weight Mn, 0.1-3.0% by weight Mo, 2.0-12.0% by weight Ni, 2.0-10.0% by weight Si and 0.05-2.0% by weight V. It can be manufactured by manufacturing a melt of the starting materials and casting the melt into a prefabricated mould. Nitridation of the steel material composition which is obtained leads to a nitridized steel material composition which, by virtue of the manufacture with gravity casting, exceeds the properties of tempered cast iron with nodular graphite. | 04-19-2012 |
20120126488 | PISTON RING - There is described a piston ring, particularly devised for use in internal combustion engines or compressors, comprising at least a metallic base ( | 05-24-2012 |
20120242047 | PISTON RING AND PISTON DEVICE - A piston ring which can sustain a superior effect of preventing aluminum cohesion for a long time in a high output engine is provided. At least one of the upper and lower side faces of a piston ring is coated with a polyimide film having hard particles dispersed therein. Employed as the hard particles may be alumina, zirconia, silicon carbide, silicon nitride, cubic boron nitride, or diamond. The hard particles are to be 0.01 to 5 μm in average particle diameter, and the film is 2 to 30 μm in thickness. | 09-27-2012 |
20120248710 | PISTON RING AND PROCESS FOR MANUFACTURING A PISTON RING - The present invention refers to a piston ring, particularly for use in the piston channel of an internal combustion engine or a compressor, comprising at least a substantially ring-shaped metallic base ( | 10-04-2012 |
20120261886 | MULTI-PIECE OIL RING - A multi-piece oil ring includes an oil ring main member in which two rails are connected together by a columnar part and which has a roughly I-shaped cross section; and a coil expander disposed in an inner circumferential groove formed on the inner circumferential surface of the columnar. Each rail in the oil ring main member possesses a sliding section protuberance whose tip possesses a jutting portion. The axial length of the jutting portion is 0.02-0.18 mm. The change rate of the axial length of the individual jutting portion is in the range of 0 to 80% at least in a region of from its sliding surface to be faced to a cylinder, which is positioned at the tip of the jutting portion, to a position of 0.03 mm away from the aforementioned sliding surface in the radial direction of the oil ring main member. | 10-18-2012 |
20130043659 | PISTON RING - Provided is a piston ring such that it is possible to sufficiently inhibit adhesive wear when the piston ring is mounted to a piston for a diesel engine in which at least the piston ring groove in the piston is formed from steel or cast iron. Disclosed is a piston ring mounted to a piston for a diesel engine, wherein the load length ratio (Rmr2) (in accordance with JIS B0601:2001) of the top surface and bottom surface of the piston ring satisfies each of the following conditions: Rmr2 (0.5%, 0.3[mu]m)=20% and Rmr2 (0.5%, 0.4[mu]m)=40%. | 02-21-2013 |
20130049304 | NITRIDED PISTON RING RESISTANT TO THE PROPAGATION OF CRACKS - This invention refers to the solution of problem of spalling of the nitrided layer in piston rings for Flex-fuel engines, without jeopardizing the wear resistance, suggesting for such purpose a nitrided piston ring ( | 02-28-2013 |
20130181410 | INTERNAL COMBUSTION ENGINE OIL RING - A high-quality internal combustion engine oil ring which stably keeps oil consumption low for a long period and in which the shapes of an upper rail and a lower rail can be formed at low cost with high accuracy. The internal combustion engine oil ring has a recessed stepped portion formed at a corner of a sliding surface of an outer peripheral sliding projection in sliding contact with a cylinder inner wall surface of at least one of a first rail and a second rail constituting an oil ring main body, in a shape in vertical cross-section along a sliding direction of the first rail and second rail, and a wall surface of the recessed stepped portion has an arcuate surface having a radius of curvature of 0.02 mm to 0.08 mm. | 07-18-2013 |
20130181411 | METHOD FOR PRODUCING A PISTON RING - A piston ring, is produced by providing, on the radially outer circumferential surface of a ring-shaped metallic main body, a recess, the metallic main body having a radially outer circumferential surface, a radially inner circumferential surface, and flank surfaces interposed therebetween providing the recess with a contour that deviates from a cylindrical shape at least on the bottom of the recess, providing at least one wear-resistant layer on the outer circumferential surface, including the recess, and at least partially removing an area of the at least one wear-resistant layer on the outer circumferential surface and including an area corresponding to a scraping edge, thereby forming a land having a predefinable width. | 07-18-2013 |
20130334774 | Structure of Titanium-alloy Piston Ring - A structure of a titanium-alloy piston ring is configured to be installed in an engine and includes a titanium-alloy matrix. The titanium-alloy matrix has an outer periphery receiving a hardening treatment (such as receiving a nitrogen treatment, or being coated with a diamond-like carbon film, or receiving a nitrogen treatment and then being coated with a diamond-like carbon film), so as to make the piston ring have improved abrasion-resistant strength, hardness, and wear resistance, thereby extending the normal service life of the piston ring. | 12-19-2013 |
20140197602 | PISTON RING WITH LOCALIZED NITRIDED COATING - A piston ring comprising upper face, a lower face, an inner perimeter wall, and an outer perimeter wall that extends around the piston ring from the upper face to the lower face, where the outer perimeter wall has upper corner region disposed adjacent the upper face, a lower corner region disposed adjacent the lower face, and a band of a nitrided conversion layer extending between the upper corner region and the lower corner region, and where a PVD nitride layer is disposed on the upper corner region and on the lower corner region. | 07-17-2014 |
20140339778 | Structure of Piston Ring - A structure of a piston ring to be installed in an engine includes a matrix. A laminated intermediate layer is formed on a surface of the matrix from hard chromium (Cr), chromium nitride (CrN) and titanium carbide (TiC) in order, and a diamond-like carbon film (DLC) is coated on an outer periphery of the intermediate layer. Thus, the piston ring is wrapped by a skin with a progressive structure having a gradient distribution of hardness. The structure formed from the diamond-like carbon film provides a low wear rate and a low friction coefficient, while applying a high bonding force to the matrix and making the piston ring have an improved normal service life that meets the related environmental regulations. | 11-20-2014 |
20140353923 | PISTON RING - Disclosed is a piston ring ( | 12-04-2014 |
20150054222 | PISTON RING WITH CHROMIUM SOLID PARTICLE WEAR-PREVENTION LAYER AND CORROSION-RESISTANT FLANK SURFACE - A coated piston ring having a base body of chromium steel with more than 10 wt.-% chromium and having an inner circumferential surface, a first flank surface, a second flank surface and an outer circumferential surface. The first flank surface comprises a nitride diffusion layer with a layer thickness of from 5-300 μm, a nitride connecting layer with a layer thickness of from 0.5-15 μm on the nitride diffusion layer, and an oxide layer with a layer thickness of from 0.05-3 μm on the nitride connecting layer. The second flank surface comprises the nitride diffusion layer, and the outer circumferential surface comprises the nitride diffusion layer and a chromium solid particle layer with 0.1-30 vol.-% solid particles, relative to the total volume of the chromium solid particle layer on the nitride diffusion layer. | 02-26-2015 |
20150076769 | PISTON RING - A piston ring for at least one of a piston of an internal combustion engine and a compressor may include at least one substantially annular metallic base having a nitrided layer. The base may include at least one chamfer and at least one outer surface that maintains contact with a layer of lubricating oil. The nitrided layer may exhibit a substantially constant thickness over at least one surface of the base and the at least one chamfer. The nitrided layer may include a nitrided diffusion layer that maintains direct contact with the layer of lubricating oil and has a residual tension ranging from +100 megapascal to −100 megapascal. | 03-19-2015 |
20150308573 | PISTON RING - To provide a piston ring having a hard laminate coating for excellent scuffing resistance, wear resistance and peeling resistance, which can be used in an environment of high mechanical and thermal load in engines, the piston ring is provided with a hard laminate coating as thick as 10-60 μm on its outer peripheral surface, the laminate coating being formed by alternately laminating two types or more of layers made of different compounds, each of the compound layers being made of nitride of at least one metal selected from the group consisting of Ti, Cr, Zr, V, Hf and Al. | 10-29-2015 |
20160003356 | HARD CARBON COATING FILM - A piston ring having a hard carbon coating film is provided that can be easily formed in the same batch, does not cause delamination, and is excellent in initial running-in and wear resistance. | 01-07-2016 |
20160084380 | PISTON RING - A piston ring may include a metallic base, an outer slide layer and an intermediate layer disposed between the base and the outer slide layer. The base may extend between at least two end regions. The outer slide layer and the intermediate layer may be disposed on an outer radial face of each end region of the base. | 03-24-2016 |
20160122862 | METHOD FOR PRODUCING PISTON A RING - A piston ring is produced in which a piston ring base body made of cast iron or cast steel is coated with at least one PVD layer having a variable layer thickness, such that an increased layer thickness is present in the region of the ring ends compared to the remaining circumferential region of the piston ring base body, wherein the piston ring base body is configured so that, in the cold operating state with the engine not running, the radial pressure distribution of the piston ring base body is such that the ring ends exhibit substantially no radial pressure across a defined circumferential angle, and the variable layer thickness of the PVD layer is set so that a substantially uniform radial pressure distribution is present along the entire ring circumference of the piston ring at a piston ring temperature above 150° C. | 05-05-2016 |
277444000 | Chromium | 17 |
20080203674 | Piston Ring Having Hard Multi-Layer Coating - A piston ring ( | 08-28-2008 |
20100066031 | PISTON RING - A piston ring, with a main body, which exhibits a contact surface, an upper and a lower side surface, and an inner circumferential surface, in which at least one of the side surfaces is provided at least with one PVD coating layer, to the effect that the layer thickness of the PVD coating layer tapers radially from the outside inward. | 03-18-2010 |
20100127462 | PISTON RING WITH A MULTILAYER ASSEMBLY, AND A METHOD FOR THE PRODUCTION THEREOF - The present invention relates to a piston ring with improved running-in and wear behaviour as well as to a method for the production thereof. According to a first embodiment, the piston ring comprises a ring body ( | 05-27-2010 |
20100171272 | PISTON RING - Disclosed is a piston ring comprising a supporting material and a wear-resistant coating. The wear-resistant coating is composed of a ternary system A-B—N which is applied using a PVD process and in which A and B each represent an element form the group encompassing Ti, Zr, Hf, V, Nb, Ta, Cr, Mo W, Al, Si and C, wherein A ≠B and N represents nitrogen. The thickness of the wear-resistant coating amounts to ≧3 μm. | 07-08-2010 |
20100187766 | HARD CHROME LAYER, COATED SUBSTRATE, AND TRIBOLOGICAL SYSTEM - The present invention relates to a hard chrome layer, which is formed substantially by electrodeposition from an electrolyte containing a hexavalent chrome and which has fissures in which particles of hard material are intercalated. According to the invention, it is provided that the particles of hard material are formed from cubic boron nitride and have an average particle size of from 0.1 to 1.0 μm. The present invention also relates to a substrate with such a hard chrome layer and to a tribological system comprising a basic body and an opposing body in the form of such a substrate. | 07-29-2010 |
20110101621 | WEAR-RESISTANT COMPONENT - The present invention pertains to wear-resistant components for internal combustion engines, particularly piston rings, especiallly piston rings that feature a wear protection layer with iron base alloy on their surface that is subjected to wear and are characterized in that they are manufactured of a coating powder by means of high-velocity flame spraying (HVOF), wherein the coating is single-phase and comprises the elements Fe, Cr, V and C, and wherein VC forms mixed crystals and also leads to a dispersion strengthening. The present invention furthermore pertains to a method for manufacturing wear-resistant components for internal combustion engines, particularly piston rings, according to the present invention. | 05-05-2011 |
20110254230 | COATINGS AND POWDERS, METHODS OF MAKING SAME, AND USES THEREOF - This invention relates to thermal spray coatings, powders useful in deposition of the thermal spray coatings, methods of producing the powders, and uses of the thermal spray coatings, for example, coating of piston rings and cylinder liners of internal combustion engines. The coatings of this invention are applied by thermal spray deposition of a powder. The powder contains bimetallic carbides of chromium and molybdenum dispersed in a matrix metal. The matrix metal contains nickel/chromium/molybdenum. | 10-20-2011 |
20120248711 | PISTON RING - A piston ring which is provided with a carbon-based coating which has a low friction property and wear resistance, that is, a piston ring which has a carbon-based coating formed over its sliding surface, in which piston ring, the coating is a multilayer coating comprised of two types of layers having different hardnesses laminated in at least two layers, a hardness difference between the two types of layers is 500 to 1700 HV, a high hardness layer has the same or greater thickness than a low hardness layer, and the coating as a whole has a thickness of 5.0 μm or more. The high hardness layer has a thickness of 5 to 90 nm. The surface on which the coating is formed has a base material roughness of 1.0 μmRz or less. | 10-04-2012 |
20120319357 | METHOD FOR PRODUCING PISTON RINGS - A method for producing piston rings, in particular compression piston rings, in which at least one main element is machined in such a way that a circumferential surface serving as a running surface is provide with a wear-resistant layer of a predeterminable layer thickness, wherein a number of piston ring, in particular compression piston rings, brought together to form an assembly, are machined cylindrically in the region of their circumferential surface, a wear-resistant electrodeposited layer of chrome is applied to the finished machined cylindrical circumferential surface, so that the wear-resistant layer has a constant layer thickness within the assembly as a whole, and subsequently the layer is machined in such a way as to produce a running surface that has a region of maximum layer thickness and at least one region of minimum layer thickness. | 12-20-2012 |
20130221621 | PISTON RING - This invention refers to a piston ring, particularly planned for use in internal combustion engines or compressors, including at least one metallic base ( | 08-29-2013 |
20130328274 | PISTON RING - The second compression ring is formed such that the outer peripheral surface shape has a tapered face, and the radial cross-sectional shape is a rectangular ring, a scraper ring, or a Napier ring, and has a piston ring base and a hard film provided at least on an outer peripheral sliding surface thereof. The piston ring base is composed of a low-alloy steel or carbon steel having a Vickers hardness of Hv 350 Hv 550. The outer peripheral sliding surface is formed so that the axial length is from 0.01 to 0.30 mm between the outer edge end part of the tapered outer peripheral sliding surface and an imaginary line contacting with a lower end surface where a curved surface having a diameter that decreases gradually inward from the outer edge end part toward the lower end in the axial direction is parallel to a ring underside. | 12-12-2013 |
20140217677 | PISTON RING WITH DUAL COATING - Exemplary piston rings are disclosed, comprising a base portion formed of a metallic material, and an outer contact surface extending between opposing side faces of the piston ring. The piston ring may include a coating layer applied to the outer contact surface, with the coating layer including an inner layer and an outer layer. Exemplary methods of making a piston ring are also disclosed, comprising providing a base portion formed of a metallic material, applying an inner layer to an outer surface of the base portion, and applying an outer layer on top of the inner layer. | 08-07-2014 |
20140284882 | WEAR PROTECTION LAYER FOR PISTON RINGS - The present invention relates to a wear-resistant layer, which is preferably used on piston rings for internal combustion engines. The wear-resistant layer comprises: 15-25% by weight iron (Fe), 10-25% by weight tungsten carbide (WC), 30-40% by weight chromium (Cr), 10-25% by weight nickel (Ni), 10-25% by weight molybdenum (Mo), 1-10% by weight carbon (C), 0.1-2% by weight silicon (Si), wherein Cr is present in elemental form and/or as a carbide in the form of Cr | 09-25-2014 |
20150054223 | COATINGS AND POWDERS, METHODS OF MAKING SAME, AND USES THEREOF - This invention relates to thermal spray coatings, powders useful in deposition of the thermal spray coatings, methods of producing the powders, and uses of the thermal spray coatings, for example, coating of piston rings and cylinder liners of internal combustion engines. The coatings of this invention are applied by thermal spray deposition of a powder. The powder contains bimetallic carbides of chromium and molybdenum dispersed in a matrix metal. The matrix metal contains nickel/chromium/molybdenum. | 02-26-2015 |
20150330507 | PISTON RING SPRAYED COATING, PISTON RING, AND METHOD FOR PRODUCING PISTON RING SPRAYED COATING - A thermal spray coating for piston ring having excellent abrasion resistance, and capable of suppressing abrasion of the opposite member is provided. The thermal spray coating for piston ring according to the invention is a thermal spray coating for piston ring obtained by thermally spraying a powder composition on the outer peripheral sliding surface of a piston ring base material, and the powder composition contains molybdenum particles, nickel chromium alloy particles and chromium carbide particles, and the median diameter of the chromium carbide particles is 5 to 25 μm. | 11-19-2015 |
20150362072 | SLIDING MEMBER AND METHOD FOR PRODUCING SAME - A sliding member includes: a base; a chromium-based hard chromium plated layer formed on the surface of the base; a hard carbon layer that is mainly composed of carbon element and is formed on the hard chromium plated layer. The hydrogen concentration of the hard chromium plated layer is equal to or less than 150 mass ppm. A method for producing the sliding member involves heating the surface of the base on which the chromium-based hard chromium plated layer has been formed at a temperature of 250° C. or more so that the hydrogen concentration of the hard chromium plated layer is equal to or less than 150 mass ppm, and thereafter forming the hard carbon layer mainly composed of carbon element on the hard chromium plated layer. | 12-17-2015 |
20160186860 | HIGHLY HEAT CONDUCTIVE PISTON RING FOR INTERNAL COMBUSTION ENGINE - There is provided a highly heat conductive piston ring for an internal combustion engine capable of exhibiting a gas seal function and a heat transfer function for a long period of time in a stable manner when used in an automobile gasoline engine having a high compression ratio. The highly heat conductive piston ring for an internal combustion engine is a piston ring for an internal combustion engine having an Mn—Cr steel as a base material, the Mn—Cr steel including C in the range of from 0.52 to 0.65 mass %, Si in the range of from 0.15 to 0.35 mass %, Mn in the range of from 0.60 to 1.00 mass %, Cr in the range of from 0.60 to 1.00 mass %, P in the range of 0.04 mass % or less, S in the range of 0.04 mass % or less, a slight amount of components (total content of Al, Ni, and Cu) in the range of from 0.05 to 3.0 mass %, and a remnant being Fe and unavoidable impurities. | 06-30-2016 |