US20120248711A1 - Piston ring - Google Patents

Piston ring Download PDF

Info

Publication number
US20120248711A1
US20120248711A1 US13/429,934 US201213429934A US2012248711A1 US 20120248711 A1 US20120248711 A1 US 20120248711A1 US 201213429934 A US201213429934 A US 201213429934A US 2012248711 A1 US2012248711 A1 US 2012248711A1
Authority
US
United States
Prior art keywords
coating
layer
piston ring
layers
thickness
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US13/429,934
Inventor
Takatsugu Iwashita
Tomoyuki Sato
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TPR Co Ltd
Original Assignee
TPR Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by TPR Co Ltd filed Critical TPR Co Ltd
Assigned to TPR CO., LTD. reassignment TPR CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: IWASHITA, TAKATSUGU, SATO, TOMOYUKI
Publication of US20120248711A1 publication Critical patent/US20120248711A1/en
Priority to US14/610,006 priority Critical patent/US9175771B2/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F5/00—Piston rings, e.g. associated with piston crown
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/26—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction characterised by the use of particular materials
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/0605—Carbon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/14—Metallic material, boron or silicon
    • C23C14/16—Metallic material, boron or silicon on metallic substrates or on substrates of boron or silicon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/04—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings of inorganic non-metallic material
    • C23C28/044—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings of inorganic non-metallic material coatings specially adapted for cutting tools or wear applications
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/40—Coatings including alternating layers following a pattern, a periodic or defined repetition
    • C23C28/44—Coatings including alternating layers following a pattern, a periodic or defined repetition characterized by a measurable physical property of the alternating layer or system, e.g. thickness, density, hardness

Definitions

  • the present invention relates to a piston ring for an internal combustion engine.
  • a carbon-based coating is known as a coating which has a low coefficient of friction, but the coating stress is high and self fracture occurs, so increasing the thickness is difficult.
  • Japanese Patent Publication (A) No. 2006-008853 proposes a carbon-based coating with a low coefficient of friction which is made a multilayer structure with a surface-most layer comprised of a soft layer and with soft layers and hard layers alternately laminated and which enables a smooth surface to be easily obtained.
  • Japanese Patent Publication (A) No. 2006-008853 does not define the hardness difference between the hard layer and the soft layer.
  • the soft layer is meant as a fitting layer
  • the hard layer is meant as a wear resistance layer, so the hardnesses are, in Example 1, soft layer: 18 GPa and hard layer: 42 GPa and, in Example 2, soft layer: 20 GPa and hard layer: 41 GPa.
  • the hardness difference between the soft layer and hard layer was large.
  • An object of the present invention is to provide a piston ring which is provided with a carbon-based coating which has a low friction property and excellent wear resistance.
  • the present invention provides 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 each, 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 ⁇ m 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 ⁇ mRz or less.
  • a surface-most layer of the coating is a high hardness layer.
  • a low hardness layer of the coating contains carbon alone or carbon and also Cr or Ti.
  • the carbon-based coating a multilayer coating of two types of layers which have a hardness difference of 500 to 1700 HV, increasing the thickness becomes possible and both a low friction property and excellent wear resistance are given. If the hardness difference is less than 500 HV, coating cracks cause the sliding surface to become rough, the coefficient of friction to become larger, and the wear of the opposing material to become greater as well. If the hardness difference becomes larger than 1700 HV, sliding causes the low hardness layer to become worn, stress concentrates at the surface relief parts of the high hardness layer (see FIG. 1B ), the coating chips, the coefficient of friction becomes larger, and wear at the opposing material also becomes greater. If the overall thickness of the coating is less than 5.0 ⁇ m, the wear resistance becomes insufficient.
  • FIGS. 1A to 1C show an embodiment of the present invention, wherein
  • FIG. 1A is a longitudinal cross-sectional view which shows one part of a piston ring
  • FIG. 1B is an enlarged cross-sectional view of a coating part
  • FIG. 1C is a view which shows one part of a coating surface after sliding
  • FIG. 2 is a schematic view of a reciprocating wear tester.
  • a piston ring 1 has a carbon-based coating 2 formed on its outer circumference.
  • the carbon-based coating 2 is a DLC (diamond-like carbon) coating comprised of a multilayer coating of two types of layers A and B with different hardnesses laminated in at least two layers each.
  • the two types of layers A and B are laminated in six layers each.
  • the surface-most layer is a layer A with a high hardness.
  • the hardness difference between the two types of layers A and B is 500 to 1700 HV.
  • the layer A with the high hardness (hereinafter referred to as the “high hardness layer A”) has a thickness of 5 to 90 nm, while the layer B with a low hardness (hereinafter referred to as the “low hardness layer B”) has the same or greater thickness.
  • the overall thickness of the carbon-based coating 2 is 5.0 ⁇ m or more.
  • the base material roughness of the outer circumference is 1.0 ⁇ mRz or less.
  • the low hardness layer B may contain Cr or Ti. If Cr or Ti is contained, the adhesion with the high hardness layer A is improved more.
  • the thickness of the high hardness layer A is smaller than 5 nm, the required widths of the high hardness layer A and the low hardness layer B which are exposed at the outer circumference after sliding (see FIG. 1C ) cannot be sufficiently secured, the oil retention property falls, and the low friction effect becomes insufficient. If the thickness becomes larger than 90 nm, the widths of the high hardness layer A and the low hardness layer B which are exposed at the outer circumference after sliding become too great, coating cracks occur, the coefficient of friction becomes greater, and the wear of the opposing material also becomes greater. If the base material roughness of the outer circumference is larger than 1.0 ⁇ mRz, sliding causes the low hardness layer B to wear, stress to concentrate at surface relief parts of the high hardness layer A (see FIG. 1B ), the coating to chip, the coefficient of friction to become greater, and the wear of the opposing material to also become greater. If the surface-most layer is a high hardness layer A, the surface of the opposing material can be quickly smoothened.
  • the above carbon-based coating 2 is formed using the PVD method by alternate sputtering (forming low hardness layer B) and ion plating (forming high hardness layer A).
  • the thicknesses of the layers are adjusted by changing the formation times, while the hardnesses are adjusted by changing the bias voltage.
  • FIG. 2 shows an outline of a reciprocating wear tester which is used for the test.
  • a pin-shaped top test piece 10 is held by a holding block 11 .
  • a hydraulic cylinder 12 is used to apply a downward load whereby a bottom test piece 13 is pressed against.
  • a flat disk shaped bottom test piece 13 is held by a movable block 14 and is made to move back and forth by a crank mechanism 15 .
  • Reference numeral 16 indicates a load cell.
  • Top test piece pin-shaped test piece for piston ring given DLC coating

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

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.

Description

  • This application claims benefit of Serial No. 2011-069676, filed 28 Mar. 2011 in Japan and which application is incorporated herein by reference. To the extent appropriate, a claim of priority is made to the above disclosed application.
    • BACKGROUND OF THE INVENTION
  • 1. Field of the Invention
  • The present invention relates to a piston ring for an internal combustion engine.
  • 2. Description of the Related Art
  • A carbon-based coating is known as a coating which has a low coefficient of friction, but the coating stress is high and self fracture occurs, so increasing the thickness is difficult. Japanese Patent Publication (A) No. 2006-008853 proposes a carbon-based coating with a low coefficient of friction which is made a multilayer structure with a surface-most layer comprised of a soft layer and with soft layers and hard layers alternately laminated and which enables a smooth surface to be easily obtained.
  • See the above Japanese Patent Publication (A) No. 2006-008853 for the related art.
  • Japanese Patent Publication (A) No. 2006-008853 does not define the hardness difference between the hard layer and the soft layer. However, in Japanese Patent Publication (A) No. 2006-008853, the soft layer is meant as a fitting layer, while the hard layer is meant as a wear resistance layer, so the hardnesses are, in Example 1, soft layer: 18 GPa and hard layer: 42 GPa and, in Example 2, soft layer: 20 GPa and hard layer: 41 GPa. The hardness difference between the soft layer and hard layer was large.
    • SUMMARY OF THE INVENTION
  • An object of the present invention is to provide a piston ring which is provided with a carbon-based coating which has a low friction property and excellent wear resistance.
  • The present invention provides 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 each, 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.
  • Preferably, the high hardness layer has a thickness of 5 to 90 nm.
  • Preferably, the surface on which the coating is formed has a base material roughness of 1.0 μmRz or less.
  • Preferably, a surface-most layer of the coating is a high hardness layer.
  • Preferably, a low hardness layer of the coating contains carbon alone or carbon and also Cr or Ti.
  • Summarizing the advantageous effects of the invention, according to the piston ring of the present invention, by making the carbon-based coating a multilayer coating of two types of layers which have a hardness difference of 500 to 1700 HV, increasing the thickness becomes possible and both a low friction property and excellent wear resistance are given. If the hardness difference is less than 500 HV, coating cracks cause the sliding surface to become rough, the coefficient of friction to become larger, and the wear of the opposing material to become greater as well. If the hardness difference becomes larger than 1700 HV, sliding causes the low hardness layer to become worn, stress concentrates at the surface relief parts of the high hardness layer (see FIG. 1B), the coating chips, the coefficient of friction becomes larger, and wear at the opposing material also becomes greater. If the overall thickness of the coating is less than 5.0 μm, the wear resistance becomes insufficient.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • These and other objects and features of the present invention will become clearer from the following description of the preferred embodiments given with reference to the attached drawings, wherein
  • FIGS. 1A to 1C show an embodiment of the present invention, wherein
  • FIG. 1A is a longitudinal cross-sectional view which shows one part of a piston ring,
  • FIG. 1B is an enlarged cross-sectional view of a coating part, and
  • FIG. 1C is a view which shows one part of a coating surface after sliding, and
  • FIG. 2 is a schematic view of a reciprocating wear tester.
    •  DESCRIPTION OF PREFERRED EMBODIMENTS
  • Below, a preferred embodiment of the present invention will be explained while referring to the drawings.
  • A piston ring 1 has a carbon-based coating 2 formed on its outer circumference. The carbon-based coating 2 is a DLC (diamond-like carbon) coating comprised of a multilayer coating of two types of layers A and B with different hardnesses laminated in at least two layers each. In FIGS. 1A to 1C, the two types of layers A and B are laminated in six layers each. The surface-most layer is a layer A with a high hardness. The hardness difference between the two types of layers A and B is 500 to 1700 HV. The layer A with the high hardness (hereinafter referred to as the “high hardness layer A”) has a thickness of 5 to 90 nm, while the layer B with a low hardness (hereinafter referred to as the “low hardness layer B”) has the same or greater thickness. The overall thickness of the carbon-based coating 2 is 5.0 μm or more. The base material roughness of the outer circumference is 1.0 μmRz or less. The low hardness layer B may contain Cr or Ti. If Cr or Ti is contained, the adhesion with the high hardness layer A is improved more.
  • If the thickness of the high hardness layer A is smaller than 5 nm, the required widths of the high hardness layer A and the low hardness layer B which are exposed at the outer circumference after sliding (see FIG. 1C) cannot be sufficiently secured, the oil retention property falls, and the low friction effect becomes insufficient. If the thickness becomes larger than 90 nm, the widths of the high hardness layer A and the low hardness layer B which are exposed at the outer circumference after sliding become too great, coating cracks occur, the coefficient of friction becomes greater, and the wear of the opposing material also becomes greater. If the base material roughness of the outer circumference is larger than 1.0 μmRz, sliding causes the low hardness layer B to wear, stress to concentrate at surface relief parts of the high hardness layer A (see FIG. 1B), the coating to chip, the coefficient of friction to become greater, and the wear of the opposing material to also become greater. If the surface-most layer is a high hardness layer A, the surface of the opposing material can be quickly smoothened.
  • The above carbon-based coating 2 is formed using the PVD method by alternate sputtering (forming low hardness layer B) and ion plating (forming high hardness layer A). The thicknesses of the layers are adjusted by changing the formation times, while the hardnesses are adjusted by changing the bias voltage.
  • Below, the results of use of a reciprocating wear tester to measure the self wear amount, opposing wear amount, and coefficient of friction will be explained.
  • FIG. 2 shows an outline of a reciprocating wear tester which is used for the test. A pin-shaped top test piece 10 is held by a holding block 11. From above, a hydraulic cylinder 12 is used to apply a downward load whereby a bottom test piece 13 is pressed against. On the other hand, a flat disk shaped bottom test piece 13 is held by a movable block 14 and is made to move back and forth by a crank mechanism 15. Reference numeral 16 indicates a load cell.
  • The test conditions were as follow:
    • Load: 100 N
    • Speed: 600 cpm/min
    • Lubrication oil: 5 W-20
    • Time: 1 hour
  • Top test piece: pin-shaped test piece for piston ring given DLC coating
    • Bottom test piece: flake shaped graphite cast iron material for cylinder liner
  • TABLE 1
    Elements
    A, B layer of B Base
    A layer B layer hardness layer material A layer
    hardness hardness difference other roughness thickness Self Opposing Coefficient
    HV HV HV than C μmRz nm wear μm wear μm of friction
    Ex. 1 2000 300 1700 — 0.2 5 0.5 1 0.04
    Ex. 2 1900 1400 500 — 0.3 20 0.5 1 0.04
    Ex. 3 2700 1000 1700 — 0.2 30 0.5 1 0.04
    Ex. 4 1700 400 1300 — 0.2 90 0.5 1 0.04
    Ex. 5 2500 1000 1500 Cr 0.3 80 0.5 1 0.04
    Ex. 6 1700 400 1300 — 0.5 10 0.5 1 0.04
    Ex. 7 1700 400 1300 — 1.0 10 0.5 1 0.04
    Comp. Ex. 1 1800 1400 400 — 0.2 90 Coating 5 0.09
    breaks
    Comp. Ex. 2 2800 1000 1800 — 0.3 90 2.0 4 0.07
    Comp. Ex. 3 1900 1400 500 — 0.3 3 0.5 1 0.06
    Comp. Ex. 4 1700 300 1400 — 0.2 110 2.0 5 0.09
    Comp. Ex. 5 2000 300 1700 — 0.2 3 0.5 1 0.07
    Comp. Ex. 6 1700 400 1300 — 1.2 10 1.5 2 0.07
  • While the invention has been described with reference to specific embodiments chosen for purpose of illustration, it should be apparent that numerous modifications could be made thereto by those skilled in the art without departing from the basic concept and scope of the invention.

Claims (5)

1. A piston ring which has a carbon-based coating formed over its sliding surface, in which piston ring, said coating is a multilayer coating comprised of two types of layers having different hardnesses laminated in at least two layers, a hardness difference between said 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.
2. A piston ring as set forth in claim 1, wherein said high hardness layer has a thickness of 5 to 90 nm.
3. A piston ring as set forth in claim 1, wherein the surface on which said coating is formed has a base material roughness of 1.0 μmRz or less.
4. A piston ring as set forth in claim 1, wherein a surface-most layer of said coating is a high hardness layer.
5. A piston ring as set forth in claim 1, wherein a low hardness layer of said coating contains carbon alone or carbon and also Cr or Ti.
US13/429,934 2011-03-28 2012-03-26 Piston ring Abandoned US20120248711A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US14/610,006 US9175771B2 (en) 2011-03-28 2015-01-30 Piston ring

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011-069676 2011-03-28
JP2011069676A JP2012202522A (en) 2011-03-28 2011-03-28 Piston ring

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US14/610,006 Continuation US9175771B2 (en) 2011-03-28 2015-01-30 Piston ring

Publications (1)

Publication Number Publication Date
US20120248711A1 true US20120248711A1 (en) 2012-10-04

Family

ID=45811322

Family Applications (2)

Application Number Title Priority Date Filing Date
US13/429,934 Abandoned US20120248711A1 (en) 2011-03-28 2012-03-26 Piston ring
US14/610,006 Active US9175771B2 (en) 2011-03-28 2015-01-30 Piston ring

Family Applications After (1)

Application Number Title Priority Date Filing Date
US14/610,006 Active US9175771B2 (en) 2011-03-28 2015-01-30 Piston ring

Country Status (7)

Country Link
US (2) US20120248711A1 (en)
EP (1) EP2505685B1 (en)
JP (1) JP2012202522A (en)
KR (1) KR20120110041A (en)
CN (1) CN102705102B (en)
BR (1) BR102012006917B1 (en)
IN (1) IN2012DE00922A (en)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130043659A1 (en) * 2010-01-29 2013-02-21 Nippon Piston Ring Co., Ltd. Piston ring
US20150362071A1 (en) * 2013-01-21 2015-12-17 Federal-Mogul Burscheid Gmbh Sliding element, in particular a piston ring, having a coating
US20160003356A1 (en) * 2013-02-28 2016-01-07 Nippon Piston Ring Co., Ltd. Hard carbon coating film
US9551419B2 (en) * 2015-04-22 2017-01-24 Federal-Mogul Corporation Coated sliding element
US20180231125A1 (en) * 2015-08-10 2018-08-16 Nippon Itf, Inc. Piston ring and engine
US10059899B2 (en) * 2012-10-23 2018-08-28 Mahle International Gmbh Component having a coating and method for the production thereof
US20180245200A1 (en) * 2015-09-09 2018-08-30 Kabushiki Kaisha Riken Sliding member and piston ring
US10072756B2 (en) 2014-01-15 2018-09-11 Federal-Mogul Burscheid Gmbh Sliding element, in particular piston ring
US10087513B2 (en) 2014-01-31 2018-10-02 Nippon Piston Ring Co., Ltd Piston ring and manufacturing method therefor
US10329509B2 (en) 2015-01-29 2019-06-25 Jtekt Corporation Amorphous hydrocarbon based film, and sliding member and sliding system with said film
US10487730B2 (en) * 2015-12-21 2019-11-26 Mahle Metal Leve S/A Sliding element
US10578214B2 (en) 2015-07-31 2020-03-03 Nippon Piston Ring Co., Ltd Piston ring and manufacturing method therefor
US10619739B2 (en) 2015-07-31 2020-04-14 Nippon Piston Ring Co., Ltd Piston ring
CN112534084A (en) * 2018-10-16 2021-03-19 舍弗勒技术股份两合公司 Component, in particular for a valve train system, and method for producing such a component
US11143302B2 (en) * 2016-06-30 2021-10-12 Mahle Metal Leve S/A Sliding element for internal combustion engines
US20220033975A1 (en) * 2018-11-08 2022-02-03 Nanofilm Technologies International Limited Ta-c based coatings with improved hardness
US11242929B2 (en) * 2018-06-29 2022-02-08 Tpr Co., Ltd. Piston ring
US11261519B2 (en) * 2015-12-18 2022-03-01 Nippon Itf, Inc. Coating film, manufacturing method therefor, and PVD apparatus

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110397735B (en) * 2015-08-10 2020-12-22 日本Itf株式会社 Piston ring
JP6413060B1 (en) * 2017-05-11 2018-10-31 日本アイ・ティ・エフ株式会社 Hard carbon film, method for producing the same, and sliding member
CN109355619A (en) * 2018-09-25 2019-02-19 安庆帝伯格茨活塞环有限公司 A kind of piston ring and preparation method with soft and hard alternation diamond-like coating

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100295251A1 (en) * 2006-11-14 2010-11-25 Takuma Sekiya Chromium nitride ion-plating coating and its production method, as well as piston ring used for internal combustion engine

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000120870A (en) 1998-10-15 2000-04-28 Teikoku Piston Ring Co Ltd Piston ring
JP2000170594A (en) 1998-12-08 2000-06-20 Teikoku Piston Ring Co Ltd Combination of cylinder liner and piston ring
JP3995900B2 (en) 2001-04-25 2007-10-24 株式会社神戸製鋼所 Diamond-like carbon multilayer film
JP2006008853A (en) 2004-06-25 2006-01-12 Nissan Motor Co Ltd Hard carbon film sliding member and manufacturing method thereof
CN101432462B (en) * 2005-08-18 2012-12-05 萨尔泽曼塔普拉斯有限公司 Substrate coated with a layered structure comprising a tetrahedral carbon layer and a softer outer layer
JP2007070667A (en) 2005-09-05 2007-03-22 Kobe Steel Ltd Formed article with hard multilayer film of diamond-like carbon, and production method therefor
JP4839120B2 (en) 2006-04-03 2011-12-21 株式会社リケン Piston ring with laminated coating
JP2008286354A (en) * 2007-05-21 2008-11-27 Nippon Piston Ring Co Ltd Sliding member
JP5828575B2 (en) * 2008-03-04 2015-12-09 日産自動車株式会社 piston ring
WO2009151404A1 (en) * 2008-06-09 2009-12-17 Nanofilm Technologies International Pte Ltd A novel coating having reduced stress and a method of depositing the coating on a substrate
DE102009028504C5 (en) 2009-08-13 2014-10-30 Federal-Mogul Burscheid Gmbh Piston ring with a coating
DE102009046281B3 (en) * 2009-11-02 2010-11-25 Federal-Mogul Burscheid Gmbh Sliding element, in particular piston ring, and combination of a sliding element with a running partner

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100295251A1 (en) * 2006-11-14 2010-11-25 Takuma Sekiya Chromium nitride ion-plating coating and its production method, as well as piston ring used for internal combustion engine

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9464717B2 (en) * 2010-01-29 2016-10-11 Nippon Piston Ring Co., Ltd. Piston ring
US20130043659A1 (en) * 2010-01-29 2013-02-21 Nippon Piston Ring Co., Ltd. Piston ring
US10059899B2 (en) * 2012-10-23 2018-08-28 Mahle International Gmbh Component having a coating and method for the production thereof
US20150362071A1 (en) * 2013-01-21 2015-12-17 Federal-Mogul Burscheid Gmbh Sliding element, in particular a piston ring, having a coating
US9488275B2 (en) * 2013-01-21 2016-11-08 Federal-Mogul Burscheid Gmbh Sliding element, in particular a piston ring, having a coating
US20160003356A1 (en) * 2013-02-28 2016-01-07 Nippon Piston Ring Co., Ltd. Hard carbon coating film
US9863534B2 (en) * 2013-02-28 2018-01-09 Nippon Piston Ring Co., Ltd. Hard carbon coating film
US10072756B2 (en) 2014-01-15 2018-09-11 Federal-Mogul Burscheid Gmbh Sliding element, in particular piston ring
US10087513B2 (en) 2014-01-31 2018-10-02 Nippon Piston Ring Co., Ltd Piston ring and manufacturing method therefor
US10450527B2 (en) * 2015-01-29 2019-10-22 Jtekt Corporation Low-friction coating production method and sliding method
US10329509B2 (en) 2015-01-29 2019-06-25 Jtekt Corporation Amorphous hydrocarbon based film, and sliding member and sliding system with said film
US9816613B2 (en) * 2015-04-22 2017-11-14 Federal-Mogul Llc Coated sliding element
US9551419B2 (en) * 2015-04-22 2017-01-24 Federal-Mogul Corporation Coated sliding element
US10578214B2 (en) 2015-07-31 2020-03-03 Nippon Piston Ring Co., Ltd Piston ring and manufacturing method therefor
US10619739B2 (en) 2015-07-31 2020-04-14 Nippon Piston Ring Co., Ltd Piston ring
US20180231125A1 (en) * 2015-08-10 2018-08-16 Nippon Itf, Inc. Piston ring and engine
US10634249B2 (en) * 2015-08-10 2020-04-28 Nippon Itf, Inc. Piston ring and engine
US20180245200A1 (en) * 2015-09-09 2018-08-30 Kabushiki Kaisha Riken Sliding member and piston ring
US10655208B2 (en) * 2015-09-09 2020-05-19 Kabushiki Kaisha Riken Sliding member and piston ring
US11261519B2 (en) * 2015-12-18 2022-03-01 Nippon Itf, Inc. Coating film, manufacturing method therefor, and PVD apparatus
US10487730B2 (en) * 2015-12-21 2019-11-26 Mahle Metal Leve S/A Sliding element
US11143302B2 (en) * 2016-06-30 2021-10-12 Mahle Metal Leve S/A Sliding element for internal combustion engines
US11242929B2 (en) * 2018-06-29 2022-02-08 Tpr Co., Ltd. Piston ring
CN112534084A (en) * 2018-10-16 2021-03-19 舍弗勒技术股份两合公司 Component, in particular for a valve train system, and method for producing such a component
US11739426B2 (en) * 2018-10-16 2023-08-29 Schaeffler Technologies AG & Co. KG Component, in particular for a valve train system, and method for producing a component of this type
US20220033975A1 (en) * 2018-11-08 2022-02-03 Nanofilm Technologies International Limited Ta-c based coatings with improved hardness
US11643733B2 (en) * 2018-11-08 2023-05-09 Nanofilm Technologies International Limited ta-C based coatings with improved hardness

Also Published As

Publication number Publication date
BR102012006917B1 (en) 2021-04-20
US20150137457A1 (en) 2015-05-21
IN2012DE00922A (en) 2015-09-04
BR102012006917A2 (en) 2013-06-04
JP2012202522A (en) 2012-10-22
EP2505685B1 (en) 2015-05-06
US9175771B2 (en) 2015-11-03
KR20120110041A (en) 2012-10-09
EP2505685A1 (en) 2012-10-03
CN102705102A (en) 2012-10-03
CN102705102B (en) 2016-03-23

Similar Documents

Publication Publication Date Title
US9175771B2 (en) Piston ring
US10514097B2 (en) Method for producing piston ring with recess
KR102265022B1 (en) Sliding Element, in Particular Piston ring
CN102171383B (en) Sliding element in an internal combustion engine, in particular a piston ring
US8986821B2 (en) Gliding element
US20200256277A1 (en) Cast iron cylinder liner, and internal combustion engine
JP6340014B2 (en) Sliding element
US20090026712A1 (en) Sliding Member
JP5903085B2 (en) Combination of cylinder bore and piston ring
JP2013528697A (en) Process for manufacturing slide elements with a coating, in particular piston rings, and slide elements
US20130084031A1 (en) Sliding element with dlc coating
CN107013360A (en) Sliding members
WO2011079360A3 (en) Nitrided piston ring resistant to crack propagation
TW201400704A (en) Structure of piston ring
US10012264B2 (en) Sliding member
US9388900B2 (en) Method for producing a piston ring having embedded particles
CN202500672U (en) Chrome-based diamond composite coating nitridized steel piston ring
TH125530A (en) Piston ring
TH64070B (en) Piston ring

Legal Events

Date Code Title Description
AS Assignment

Owner name: TPR CO., LTD., JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:IWASHITA, TAKATSUGU;SATO, TOMOYUKI;REEL/FRAME:027933/0983

Effective date: 20120312

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION