Nitrided Patents (Class 277/443)
  • Patent number: 10711780
    Abstract: A hydraulic machine is described having a first part (2) and a second part (3) moveable relative to said first part (3), one of said first part (2) and said second part (3) having a first land (9) resting against the other one of said second part (3) and said first part (2), having a predetermined first height (H1), and being arranged between a high pressure area (7) and a low pressure area (8). Such a machine should have a long working life. To this end a second land (10) having a predetermined second height (H2) smaller than said first height (H1) is located adjacent to said first land (9).
    Type: Grant
    Filed: June 21, 2016
    Date of Patent: July 14, 2020
    Assignee: Danfoss A/S
    Inventors: Stig Kildegaard Andersen, Poul Erik Hansen, Erik Haugaard
  • Patent number: 10704690
    Abstract: A piston ring may have a base with a sliding external surface, an internal surface, an upper surface, and a lower surface, the external surface having chamfered edges. The external surface, the internal surface, the upper surface, the lower surface, and the chamfered edges may have a coating provided with a nitrided first layer having a thickness of up to 2% of a nominal axial thickness of the ring when applied to the upper surface and the lower surface, and a thickness of up to 10% in relation to the thickness of the first layer applied to the upper surface and the lower surfaces when applied to the external surface and to the chamfered edges. The external surface and the chamfered edges may include a sliding layer having one of a hard chromium or ceramic chromium plated coating, the sliding layer being applied on the first layer, the sliding layer having a thickness of between 80 and 175 microns.
    Type: Grant
    Filed: April 28, 2016
    Date of Patent: July 7, 2020
    Assignees: Mahle Metal Leve S/A, Mahle International GmbH
    Inventor: Rafael Antonio Bruno
  • Patent number: 10697543
    Abstract: A sliding element, in particular a piston ring has an outer circumferential running surface of the piston ring, has no nitriding layer, preferable no surface hardening the running surface has as an outermost layer, which differs from the intermediate layer, a DLC layer or a metal-based nitride layer, preferable a metal nitride layer, preferably a CrN layer. Provided between the substrate of the sliding element and the DLC layer there is at least one metal-containing intermediate layer, preferably a metal layer, particularly preferable a chromium layer, and at least one further surface of the sliding element, preferably the piston ring flanks, is surface-hardened, preferably has a nitriding layer.
    Type: Grant
    Filed: July 15, 2015
    Date of Patent: June 30, 2020
    Assignee: Federal-Mogul Burscheid GmbH
    Inventor: Christiane Bauer
  • Patent number: 10634248
    Abstract: A piston ring for a piston of an internal combustion engine may include a body composed of a ferrous material. The body may have an upper portion, a lower portion opposed to the upper portion, an internal portion configured to face towards a piston groove and an external portion opposed to the internal portion. An upper chamfer may be disposed between the upper portion and the external portion. A lower chamfer may be disposed between the lower portion and the external portion. The upper portion, the lower portion and the internal portion may each have a nitrided layer. The external portion, the upper chamfer and the lower chamfer may include at least one ion plated coating layer. The nitrided portion in at least a superficial layer may have a hardness of 700 HV or less.
    Type: Grant
    Filed: February 9, 2015
    Date of Patent: April 28, 2020
    Assignees: MAHLE METAL LEVE S/A, MEHLE INTERNATIONAL GMBH
    Inventors: Sandra Matos Cordeiro Costa, Gisela Ablas Marques
  • Patent number: 10514097
    Abstract: A method for producing a piston ring for a cylinder that moves in a sliding direction includes providing a piston ring base material having an upper surface, a lower surface and an outer circumferential surface having a first recess between the upper surface and the lower surface, forming a hard film in the first recess and on a cylindrical surface at a predetermined thickness, and removing, by performing a polishing process on the sliding surface, the hard film formed on the cylindrical surface and a part of the piston ring base material disposed adjacent to the removed hard film, to form a second recess. The second recess is formed by removing an area of the removed part of the piston ring base material as a result of polishing the sliding surface due to a difference in the hardness of the hard film and the piston ring base material.
    Type: Grant
    Filed: August 9, 2017
    Date of Patent: December 24, 2019
    Assignee: NIPPON PISTON RING CO., LTD.
    Inventors: Kazuhiro Fujimura, Atsushi Chiba, Naoyuki Akimoto, Iwao Hiraishi
  • Patent number: 10487730
    Abstract: A sliding element, for example a piston ring for an internal combustion engine, may include a sliding face, an adhesive layer disposed on the sliding face, and a coating disposed over the adhesive layer. The coating may be composed of an amorphous carbon material. The coating may have a ratio between sp3 bonds and sp2 bonds that indicates a predominance of sp2 bonds. The coating may have a roughness profile including a value of Rpk of ?0.15 ?m and a value of Rz of 0.7?Rz?1.5 ?m.
    Type: Grant
    Filed: December 20, 2016
    Date of Patent: November 26, 2019
    Assignees: Mahle Metal Leve S/A, Mahle International GmbH
    Inventors: Juliano Avelar Araujo, Eliel Dos Santos Paes
  • Patent number: 10487405
    Abstract: A piston ring may include a stainless steel base having between 8% and 15% by weight of chromium, together with other elements and impurities, and having a hardness between 350 HV and 420 HV. The piston ring may also include a superficial nitrided layer having a depth of no more than 60 ?m and an average hardness measured upon the surface exceeding 800 HV. The nitrided layer may include a plurality of nitride particles, which may have a maximum size of 5 ?m and may be distributed over between 4% and 8% of an area of the nitrided layer.
    Type: Grant
    Filed: October 16, 2015
    Date of Patent: November 26, 2019
    Assignees: Mahle Metal Leve S/A, Mahle International GmbH
    Inventor: Gisela Ablas Marques
  • Patent number: 10370755
    Abstract: 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.
    Type: Grant
    Filed: May 10, 2014
    Date of Patent: August 6, 2019
    Assignee: Wilmington Trust, National Association, as Collateral Trustee
    Inventors: Ralf Lammers, Christiane Bauer, Yurly Ivanov
  • Patent number: 10302197
    Abstract: A graphite cast iron nitrided piston ring has a main body including matrix and a nitrided layer. The matrix is made of graphite cast iron, and the nitrided layer is formed by subjecting a surface of the matrix to contact a cylinder to a gas nitriding process. With the nitrided layer formed at the surface of the matrix made of graphite cast iron, the piston ring has sufficient hardness and good abrasion resistance.
    Type: Grant
    Filed: August 28, 2017
    Date of Patent: May 28, 2019
    Assignee: JAPON TRAFFIC TECH CORP.
    Inventors: Wan Tzu Chien, Wei Te Wu, Chen Yu Chien, Chia Chun Li
  • Patent number: 10145001
    Abstract: Disclosed is a method and apparatus for forming a coating layer using a physical vapor deposition apparatus equipped with a sputtering apparatus and an arc ion plating apparatus, comprising: a first coating step of forming a Mo coating layer on a base material using a the sputtering apparatus and a Mo target and Ar gas; a nitrating step of forming a nitride film forming condition using an arc ion plating apparatus and Ar gas and N2 gas; a second coating step of forming a nano composite coating layer of Cr—Mo—N using the Mo target and Ar gas of the sputtering apparatus and the Ar gas, N2 gas and a Cr source of the arc ion plating apparatus at the same time; and a multi-coating step of forming a multi-layer having alternating Cr—Mo—N nano composite coating layers and Mo coating layers by revolving the base material around a central pivot.
    Type: Grant
    Filed: June 6, 2016
    Date of Patent: December 4, 2018
    Assignees: Hyundai Motor Company, Hyundai Steel Company
    Inventors: In Woong Lyo, Woong Pyo Hong, Kwang Hoon Choi, Hyuk Kang, Sang Jin Park, Yoon Suk Oh
  • Patent number: 10036472
    Abstract: Provided is a sliding member capable of achieving excellent wear resistance and high coating adhesion under harsh sliding conditions without subjecting a base member to nitriding treatment. The sliding member includes a base member made of a steel material and a hard coating that is formed on the base member and having a surface serving at least as a sliding surface. The hard coating has a Young's modulus having a distribution to increase first in a depth direction directed from an interface between the hard coating and the base member to the surface, to become maximum at a predetermined depth, and then to decrease in the depth direction directed from the interface to the surface.
    Type: Grant
    Filed: February 28, 2017
    Date of Patent: July 31, 2018
    Assignee: KABUSHIKI KAISHA RIKEN
    Inventor: Masaki Moronuki
  • Patent number: 9810323
    Abstract: 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.
    Type: Grant
    Filed: May 15, 2014
    Date of Patent: November 7, 2017
    Assignees: Mahle International GmbH, Mahle Metal Leve S/A
    Inventors: Paulo Jose Da Rocha Mordente, Paulo R. Vieira De Morais, Jose V. Lima Sarabanda
  • Patent number: 9759324
    Abstract: A piston ring for an internal combustion engine may include a metal base and a protective coating disposed on the base to cover at least part of a surface of the base. The coating may be composed of at least one nitride phase formed from at least one metal element and aluminum, and the coating may have an internal stress of less than 1.2 GPa.
    Type: Grant
    Filed: December 3, 2014
    Date of Patent: September 12, 2017
    Assignees: Mahle Metal Leve S/A, Mahle International GmbH
    Inventor: Mauricio Ciminelli Duarte De Souza
  • Patent number: 9702461
    Abstract: 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.
    Type: Grant
    Filed: August 17, 2012
    Date of Patent: July 11, 2017
    Assignees: MAHLE Metal Leve S.A., MAHLE International GmbH
    Inventors: Rodrigo Favaron, Gisela A. Marques
  • Patent number: 9174276
    Abstract: A piston ring exhibiting particles capable of wear resistance on its shoulder is produced by producing a melt of the base materials of a metal material, adding ceramic particles to the melt, pouring the melt into a prefabricated mold and cooling the melt. During cooling, the mold is aligned such that the ceramic particles gather on at least one of the piston ring shoulders.
    Type: Grant
    Filed: July 19, 2011
    Date of Patent: November 3, 2015
    Assignee: Federal-Mogul Burscheid GmbH
    Inventors: Richard Mittler, Laszlo Pelsoeczy
  • Patent number: 9163726
    Abstract: 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 (2) having at least a first region (20), at least a second region (21) and at least a gap (22), the first region (20) being positioned in a way substantially opposite to the gap (22), the ring comprising at least a nitrided layer (3) in the second region (21) and comprising at least reduction of the nitrided layer (3) in the first region (20), whereas the reduced nitrided layer (3) is at least partially blocked in the first region (20) due to the previous application of an intermediate layer (4).
    Type: Grant
    Filed: September 24, 2010
    Date of Patent: October 20, 2015
    Assignees: MAHLE International GmbH, MAHLE Metal Leve S/A
    Inventors: Rodrigo Favaron, Robert Richard Banfield
  • Patent number: 9132517
    Abstract: 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.
    Type: Grant
    Filed: September 2, 2011
    Date of Patent: September 15, 2015
    Assignee: Federal-Mogul Burscheid GmbH
    Inventor: Peter-Klaus Esser
  • Patent number: 9085056
    Abstract: 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.
    Type: Grant
    Filed: September 2, 2011
    Date of Patent: July 21, 2015
    Assignee: Federal-Mogul Burscheid GmbH
    Inventors: Peter-Klaus Esser, Juergen Gillen
  • Patent number: 8986465
    Abstract: 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.
    Type: Grant
    Filed: January 15, 2013
    Date of Patent: March 24, 2015
    Assignee: Mahle Industries Inc.
    Inventor: John C. Lahrman
  • Publication number: 20150076769
    Abstract: 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.
    Type: Application
    Filed: August 17, 2012
    Publication date: March 19, 2015
    Applicants: Mahle International GmbH, Mahle - Metal Leve S/A
    Inventors: Rodrigo Favaron, Gisela A. Marques
  • Publication number: 20150054222
    Abstract: 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 ?m, a nitride connecting layer with a layer thickness of from 0.5-15 ?m on the nitride diffusion layer, and an oxide layer with a layer thickness of from 0.05-3 ?m 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.
    Type: Application
    Filed: December 7, 2012
    Publication date: February 26, 2015
    Inventors: Christian Herbst-Dederichs, Waldemar Urbatzka, Stefan Dürdoth, Peter-Klaus Esser
  • Publication number: 20140353923
    Abstract: Disclosed is a piston ring (1) having a substrate (10) to which a wear resistant coating (20) is applied that includes at least one first element with a melting point Tm?700° C. The wear resistant coating (20) contains at least one second element with a melting point Tm>760° C. The wear resistant coating also includes droplets (30) which have a diameter (D) and which contain at least the first element, wherein at least 90% of the droplets (30) have a value 1 ?m?D?10 ?m. In the method for producing a wear resistant coating (20) using an arc evaporation technique, the target material includes at least one first element with a melting point Tm?700° C. and at least one second element with a melting point Tm>760° C., wherein the quantity of the second material contained in the target material is such that the melting point (Tm) of the target material ?1000° C.
    Type: Application
    Filed: January 14, 2013
    Publication date: December 4, 2014
    Inventors: Ralf Lammers, Christiane Bauer, Manfred Fischer, Jorg Vetter
  • Publication number: 20140339778
    Abstract: 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.
    Type: Application
    Filed: August 4, 2014
    Publication date: November 20, 2014
    Inventor: Wan-Jie Lu
  • Patent number: 8820750
    Abstract: 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.
    Type: Grant
    Filed: March 31, 2011
    Date of Patent: September 2, 2014
    Assignee: Nippon Piston Ring Co., Ltd.
    Inventors: Atsushi Chiba, Kazuhiro Fujimura, Iwao Hiraishi, Makoto Kajiwara
  • Publication number: 20140197602
    Abstract: 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.
    Type: Application
    Filed: January 15, 2013
    Publication date: July 17, 2014
    Applicant: Mahle International GmbH
    Inventor: John C. Lahrman
  • Publication number: 20140008874
    Abstract: A method for producing a recessed steel piston ring provided with a wear-resistant layer includes generating a main body that has a recess on the running surface side and that, in the region where a lower flank of the main body transitions into the running surface is worked so that a chamfer is created, providing the running surface and at least portions of the chamfer with at least one wear-resistant layer, nitriding the circumferential surface and the lower and upper flanks of the main body that are not provided with the wear-resistant layer so that a section having a defined width and having no nitride layer remains on the flank adjacent the chamfer, and removing the at least one wear-resistant layer to such an extent that a substantially sharp, but unnitrided functional edge is created in the region where the lower flank transitions into the running surface.
    Type: Application
    Filed: February 2, 2012
    Publication date: January 9, 2014
    Applicant: FEDERAL-MOGUL BURSCHEID GMBH
    Inventor: Peter-Klaus Esser
  • Publication number: 20130334774
    Abstract: 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.
    Type: Application
    Filed: March 7, 2013
    Publication date: December 19, 2013
    Applicant: TAI MAO INDUSTRIAL CORP.
    Inventor: Wan-Jie Lu
  • Patent number: 8561998
    Abstract: 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 (100,100?) equipped with two nitrided layers (1,2), with metallic base (3) composed mainly of iron and whose superficial hardness presented is of about 800 Vickers, decreasing in a substantially linear manner up to about 400 Vickers for a distance to the surface of up to 90 microns (?m).
    Type: Grant
    Filed: December 21, 2010
    Date of Patent: October 22, 2013
    Assignee: MAHLE International GmbH
    Inventors: Gisela Ablas Marques, André Ferrarese, Claudinei José de Oliveira, Jan Vatavuk
  • Publication number: 20130181410
    Abstract: 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.
    Type: Application
    Filed: March 31, 2011
    Publication date: July 18, 2013
    Applicant: NIPPON PISTON RING CO., LTD
    Inventors: Atsushi Chiba, Kazuhiro Fujimura, Iwao Hiraishi, Makoto Kajiwara
  • Publication number: 20130181411
    Abstract: 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.
    Type: Application
    Filed: September 2, 2011
    Publication date: July 18, 2013
    Applicant: FEDERAL-MOGUL BURSCHEID RING
    Inventor: Peter-Klaus Esser
  • Publication number: 20130049304
    Abstract: 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 (100,100?) equipped with two nitrided layers (1,2), with metallic base (3) composed mainly of iron and whose superficial hardness presented is of about 800 Vickers, decreasing in a substantially linear manner up to about 400 Vickers for a distance to the surface of up to 90 microns (?m).
    Type: Application
    Filed: December 21, 2010
    Publication date: February 28, 2013
    Applicants: MAHLE INTERNATIONAL GMBH, MAHLE METAL LEVE S/A
    Inventors: Gisela Ablas Marques, André Ferrarese, Claudinei José de Oliveira, Jan Vatavuk
  • Publication number: 20130042845
    Abstract: The invention relates to a sliding element, in particular a piston ring, preferably made of cast iron or steel, comprising a coating having a CrN, an Me(CxNy), and a DLC layer extending from the inside to the outside, wherein the DLC layer is either metal-free or consists of a metal-containing substructure and a metal-free DLC top layer. The invention further relates to a combination of such a sliding element with an iron-based mating miming element.
    Type: Application
    Filed: August 19, 2010
    Publication date: February 21, 2013
    Inventors: Marcus Kennedy, Michael Zinnabold
  • Publication number: 20130043659
    Abstract: 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%.
    Type: Application
    Filed: January 28, 2011
    Publication date: February 21, 2013
    Applicant: NIPPON PISTON RING CO., LTD.
    Inventors: Michihiro Ito, Naoyuki Akimoto, Iwao Hiraishi, Makoto Kajiwara, Atsushi Chiba
  • Publication number: 20120261886
    Abstract: 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.
    Type: Application
    Filed: March 26, 2010
    Publication date: October 18, 2012
    Applicant: NIPPON PISTON RING CO., LTD.
    Inventors: Atsushi Chiba, Kazuhiro Fujimura, Iwao Hiraishi, Makoto Kajiwara
  • Publication number: 20120248710
    Abstract: 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 (2) having at least a first region (20), at least a second region (21) and at least a gap (22), the first region (20) being positioned in a way substantially opposite to the gap (22), the ring comprising at least a nitrided layer (3) in the second region (21) and comprising at least reduction of the nitrided layer (3) in the first region (20), whereas the reduced nitrided layer (3) is at least partially blocked in the first region (20) due to the previous application of an intermediate layer (4).
    Type: Application
    Filed: September 24, 2010
    Publication date: October 4, 2012
    Applicants: MAHLE METAL LEVE S/A, MAHLE INTERNATIONAL GMBH
    Inventors: Rodrigo Favaron, Robert Richard Banfield
  • Publication number: 20120242047
    Abstract: 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 ?m in average particle diameter, and the film is 2 to 30 ?m in thickness.
    Type: Application
    Filed: December 7, 2010
    Publication date: September 27, 2012
    Inventors: Hayato Sasaki, Takashi Ono
  • Patent number: 8235393
    Abstract: 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.
    Type: Grant
    Filed: January 24, 2008
    Date of Patent: August 7, 2012
    Assignee: Federal-Mogul Burscheid GmbH
    Inventors: Johannes Esser, Hans-Rainer Brillert
  • Patent number: 8201831
    Abstract: 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.
    Type: Grant
    Filed: November 30, 2006
    Date of Patent: June 19, 2012
    Assignee: Federal-Mogul Burscheid GmbH
    Inventors: Steffen Hoppe, Manfred Fischer, Ralf Lammers, Manfred Muller, Christiane Bauer, Reiner Waller, Jorg Vetter
  • Publication number: 20120126488
    Abstract: There is described a piston ring, particularly devised for use in internal combustion engines or compressors, comprising at least a metallic base (2) to which there is applied, by the process of physical vapor deposition (PVD), a coating (3) of chromium nitride that comprises a periodicity (P), formed by at least two adjacent layers (5,5?), each layer (5,5?) having a predominantly chromium nitride phase different from the adjacent layer.
    Type: Application
    Filed: June 29, 2010
    Publication date: May 24, 2012
    Applicants: MAHLE METAL LEVE S/A, MAHLE INTERNATIONAL GMBH
    Inventor: Juliano Avelar Araújo
  • Publication number: 20120091663
    Abstract: 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.
    Type: Application
    Filed: November 23, 2009
    Publication date: April 19, 2012
    Inventor: Laszlo Pelsoeczy
  • Publication number: 20110148047
    Abstract: The present invention refers to a piston ring for internal combustion engine, having an outer surface of a coating of Chromium Nitride (CrN and Cr2N) and Niobium Nitride (NbN and Nb4N3), capable of offering greater resistance to peeling of the coating, also maintaining an excellent level of resistance to wear and tear and scratches to the layer of Chromium Nitride deposited.
    Type: Application
    Filed: June 26, 2009
    Publication date: June 23, 2011
    Inventor: Juliano Avelar Araujo
  • Publication number: 20110100318
    Abstract: An oil ring Ro for an internal combustion engine according to the present invention includes at least one selected from the group consisting of hard carbon, CrN and TiN that covers an outer periphery 1 of the oil ring. A radius of curvature R at an outermost portion T of the oil ring in a sliding direction is 0.3 mm or more.
    Type: Application
    Filed: June 15, 2009
    Publication date: May 5, 2011
    Inventors: Tsuyoshi Higuchi, Yutaka Mabuchi, Makoto Yoshida
  • Patent number: 7871078
    Abstract: A piston ring includes a running surface having a running surface profile, and an upper flank surface and a lower flank surface. At least the running surface is provided with a vapor-deposited layer such that part of the running surface is provided with a removable cover enabling an essentially sharp-edged running edge to be formed between the running surface and at least one of the flank surfaces, once the vapor-deposited layer has been produced and the cover has been removed.
    Type: Grant
    Filed: November 17, 2004
    Date of Patent: January 18, 2011
    Assignee: Federal-Mogul Burscheid GmbH
    Inventors: Manfred Fischer, Christian Herbst-Dederichs
  • Publication number: 20100295251
    Abstract: [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. [Means for Solution] (1) Composition is mainly composed of chromium, nitrogen, and carbon, and the concentration of carbon relative to the total concentration of the main components is from 4 to 8% by weight. (2) The crystal structure is that texture of the CrN (111) plane orientation is from 0.4 to 2.0 in terms of a CrN (111) structural coefficient. (3) Vickers hardness is from Hv 1600 to Hv 2000.
    Type: Application
    Filed: November 12, 2007
    Publication date: November 25, 2010
    Inventors: Takuma Sekiya, Terushige Ueda, Yuji Shima, Shigeo Inoue
  • Publication number: 20100253006
    Abstract: 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.
    Type: Application
    Filed: November 28, 2008
    Publication date: October 7, 2010
    Applicant: NIPPON PISTON RING CO., LTD
    Inventors: Yoshiki Ishikawa, Seisuke Takaki, Motonobu Onoda
  • Publication number: 20100187765
    Abstract: 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.
    Type: Application
    Filed: July 18, 2008
    Publication date: July 29, 2010
    Inventors: Steffen Hoppe, Manfred Fischer, Christiane Bauer, Ralf Lammers
  • Publication number: 20100117304
    Abstract: 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 ?m at least up to the respective running surface butt edge.
    Type: Application
    Filed: January 30, 2008
    Publication date: May 13, 2010
    Inventors: Johannes Esser, Frank Münchow
  • Publication number: 20100066031
    Abstract: 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.
    Type: Application
    Filed: January 30, 2008
    Publication date: March 18, 2010
    Inventors: Johannes Esser, Frank Münchow
  • Publication number: 20100044969
    Abstract: 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 ?m and adjacent individual layers within the periodicity having different metallic elements.
    Type: Application
    Filed: October 1, 2007
    Publication date: February 25, 2010
    Inventors: Manfred Fischer, Ralf Lammers, Christiane Bauer, Steffen Hoppe
  • Publication number: 20100044968
    Abstract: 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.
    Type: Application
    Filed: October 1, 2007
    Publication date: February 25, 2010
    Inventors: Manfred Fischer, Ralf Lammers, Christiane Bauer, Steffen Hoppe