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WO2023013264A1 - Bague de lubrification - Google Patents

Bague de lubrification Download PDF

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Publication number
WO2023013264A1
WO2023013264A1 PCT/JP2022/024541 JP2022024541W WO2023013264A1 WO 2023013264 A1 WO2023013264 A1 WO 2023013264A1 JP 2022024541 W JP2022024541 W JP 2022024541W WO 2023013264 A1 WO2023013264 A1 WO 2023013264A1
Authority
WO
WIPO (PCT)
Prior art keywords
base material
segment
oil ring
segments
pair
Prior art date
Application number
PCT/JP2022/024541
Other languages
English (en)
Japanese (ja)
Inventor
健太朗 河野
涼矢 清水
Original Assignee
Ｔｐｒ株式会社
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株式会社 filed Critical Ｔｐｒ株式会社
Priority to CN202280054486.XA priority Critical patent/CN117836542B/zh
Publication of WO2023013264A1 publication Critical patent/WO2023013264A1/fr

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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
    • F16J9/06—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction using separate springs or elastic elements expanding the rings; Springs therefor ; Expansion by wedging
    • 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

Definitions

  • the present invention relates to an oil ring provided with a pair of segments.
  • An internal combustion engine installed in a typical automobile adopts a configuration in which a combination of a piston ring (an example of a ring-shaped member) including a compression ring (pressure ring) and an oil ring is mounted in the ring groove of the piston.
  • the compression ring has a gas seal function that suppresses the outflow (blow-by) of combustion gas from the combustion chamber side to the crank chamber side by maintaining airtightness, and scrapes off excess oil that the oil ring could not scrape off. It has an oil seal function that suppresses oil rise.
  • the oil ring has an oil seal function that suppresses the outflow of oil to the combustion chamber side by scraping off excess engine oil (lubricating oil) adhering to the inner wall surface of the cylinder toward the crank. By adjusting the amount of oil so that it is properly retained on the inner wall surface, it has the function of preventing seizure of the compression rings and pistons that accompany the operation of the internal combustion engine.
  • the oil ring includes a pair of segments (also called side rails) arranged independently of each other in the axial direction of the oil ring and sliding on the inner wall surface of the cylinder, and a segment provided between the pair of segments.
  • a three-piece combination oil ring is widely used, which is combined with a spacer expander that urges a pair of segments against the inner wall surface of the cylinder.
  • Patent Document 1 discloses that in a pair of segments, the upper segment provided on the combustion chamber side and the lower segment provided on the crank chamber side have different outer peripheral surface shapes to reduce oil consumption and friction.
  • An oil ring is disclosed that reduces the
  • the upper segment located on the combustion chamber side slides under more severe conditions than the lower segment located on the crank chamber side. It tends to wear more than the lower segment.
  • the gap (side clearance) between the upper groove wall of the ring groove and the upper segment expands, which may deteriorate the oil sealing function of the oil ring.
  • the present invention has been made in view of the above problems, and an object thereof is to provide a technique capable of preventing deterioration of the oil seal function in an oil ring provided with a pair of segments.
  • the present invention employs the following configuration. That is, the present invention provides an oil ring to be assembled to a piston in an internal combustion engine, which is formed along the circumferential direction of the oil ring using an annular wire rod as a base material, and independently of each other in the axial direction of the oil ring. and a spacer expander arranged between the pair of segments.
  • the oil ring has higher wear resistance than the base material of the lower segment located on the crank chamber side in the internal combustion engine of the pair of segments.
  • the lower segment by making the wear resistance of the base material of the upper segment arranged on the combustion chamber side higher than the wear resistance of the base material of the lower segment arranged on the crank chamber side, the lower segment It can also reduce the wear of the upper segment that slides under severe conditions. As a result, deterioration of the oil seal function can be prevented.
  • the base material of the upper segment may have higher hardness than the base material of the lower segment.
  • the base material of the upper segment may have a hardness higher than that of the base material of the lower segment by 30 Hv or more.
  • the base material of the upper segment may have a higher carbide occupied area ratio on the surface than the base material of the lower segment.
  • the material of the base material of the upper segment and the material of the base material of the lower segment may be different.
  • FIG. 1 is a partial cross-sectional view of an internal combustion engine provided with an oil ring according to an embodiment
  • FIG. It is a schematic diagram which shows the structure of a reciprocating friction tester. It is a graph which shows a wear amount ratio. It is a graph which shows a wear amount ratio.
  • FIG. 1 is a partial cross-sectional view of an internal combustion engine 100 provided with an oil ring 40 according to an embodiment.
  • FIG. 1 shows a cross section perpendicular to the circumferential direction of the oil ring 40 .
  • a predetermined separation distance is secured between the inner wall surface 10a of the cylinder 10 and the outer peripheral surface 20a of the piston 20 mounted on the cylinder 10, so that the piston clearance PC1 is formed.
  • a ring groove 30 having a substantially rectangular cross section is formed in the outer peripheral surface 20 a of the piston 20 .
  • the ring groove 30 connects an upper wall 301 formed on the combustion chamber side, a lower wall 302 formed on the crank chamber side and facing the upper wall 301, and inner peripheral edges of the upper wall 301 and the lower wall 302. wall 303;
  • An oil ring 40 according to this embodiment is mounted in the ring groove 30 .
  • the oil ring 40 is a sliding member that is attached to the piston 20 by being fitted in the ring groove 30 and slides on the inner wall surface 10a of the cylinder 10 as the piston 20 reciprocates.
  • the oil ring 40 is a so-called three-piece combination oil ring, and includes a pair of segments 1 and 2 and a spacer expander 3 as shown in FIG.
  • the direction (axial direction) along the central axis of the oil ring 40 is defined as “vertical direction”.
  • the combustion chamber side (upper side in FIG. 1) of the internal combustion engine 100 is defined as “upper side”
  • the opposite side, that is, the crank chamber side (lower side in FIG. 1) is defined as “upper side”. defined as 'lower side'.
  • the term “peripheral direction” refers to the circumferential direction of the oil ring 40
  • the term “radial direction” refers to the radial direction of the oil ring 40.
  • the “axial direction” refers to the axial direction of the oil ring 40 .
  • the state in which the oil ring is attached to the piston attached to the cylinder of the internal combustion engine as shown in FIG. 1 is referred to as the "used state”.
  • the term “barrel shape” refers to a surface shape that is curved so as to be convex radially outward including the apex, which is the maximum diameter of the piston ring, and the apex is in the axial direction of the ring It includes a "symmetrical barrel shape” located in the center of the width and an “eccentric barrel shape” in which the apex is located closer to the crankcase than the center of the axial width of the ring.
  • the term “tapered shape” refers to a surface shape that is inclined so as to increase in diameter toward the crank chamber.
  • the pair of segments 1 and 2 are annularly formed along the circumferential direction of the oil ring 40, and are provided independently of each other and separated from each other in the axial direction.
  • the upper segment 1, which is one of the pair of segments 1 and 2 is provided on the upper side (combustion chamber side) of the internal combustion engine 100, and the other, the lower segment 2, is provided on the lower side of the internal combustion engine 100. side (crank chamber side).
  • the upper segment 1 includes a base material 1a formed in an annular shape from a segment wire and an outer coating 1b formed on the outer peripheral surface of the base material 1a. .
  • the upper segment 1 has an outer peripheral surface 11 , an inner peripheral surface 12 , an upper surface 13 and a lower surface 14 .
  • An outer coating 1b is formed on the outer peripheral surface 11 .
  • the upper surface 13 and the lower surface 14 define the axial width of the upper segment 1 .
  • the upper segment 1 is provided so that the upper surface 13 faces the upper wall 301 of the ring groove 30 in use, and slides on the inner wall surface 10a of the cylinder 10 using the outer peripheral surface 11 as a sliding surface.
  • the lower segment 2 includes a base material 2a formed in an annular shape from a segment wire and an outer coating 2b formed on the outer peripheral surface of the base material 2a.
  • the lower segment 2 has an outer peripheral surface 21 , an inner peripheral surface 22 , an upper surface 23 and a lower surface 24 .
  • An outer coating 2 b is formed on the outer peripheral surface 21 .
  • the upper surface 23 and the lower surface 24 define the width of the lower segment 2 in the axial direction.
  • the lower segment 2 is provided so that the lower surface 24 faces the lower wall 302 of the ring groove 30 in use, and slides on the inner wall surface 10a of the cylinder 10 using the outer peripheral surface 21 as a sliding surface.
  • the spacer expander 3 is provided between a pair of segments 1 and 2 and has self-tension so that it expands in use. Therefore, the upper segment 1 and the lower segment 2 are urged radially outward by the spacer expander 3, and the outer peripheral surface 11 of the upper segment 1 and the outer peripheral surface 21 of the lower segment 2 press the inner wall surface 10a of the cylinder 10. do. As a result, an oil sealing function is obtained, and an oil film is formed so that the engine oil present on the inner wall surface 10a of the cylinder 10 has an appropriate thickness.
  • the shape of the spacer expander according to the present invention is not particularly limited.
  • the outer peripheral surfaces 11, 21 of the pair of segments 1, 2 have a symmetrical barrel shape with low friction.
  • the shape of the pair of segments is not limited to that shown in FIG.
  • the outer peripheral surface of the upper segment located on the upper side of the pair of segments may have an eccentric barrel shape with excellent oil scraping performance
  • the outer peripheral surface of the lower segment located on the lower side may have a symmetrical barrel shape with low friction.
  • both outer peripheral surfaces may have an eccentric barrel shape.
  • the outer peripheral surface of the upper segment may have a symmetrical barrel shape, and the outer peripheral surface of the lower segment may have an eccentric barrel shape.
  • the outer peripheral surface 11 of the upper segment 1 may be tapered for excellent oil scraping performance, or both outer peripheral surfaces may be tapered.
  • the outer peripheral surface of the upper segment may be tapered, and the outer peripheral surface of the lower segment may be symmetrical barrel-shaped.
  • the base material 1a of the upper segment 1 and the base material 2a of the lower segment 2 are different. More specifically, the material of the base material 1a and the material of the base material 2a are different from each other.
  • the base material 1a of the upper segment 1 is made of SWRH72A and has a hardness of 450 Hv or more and 550 Hv or less.
  • the base material 2a of the lower segment 2 is made of SUS440B and has a hardness of 300 Hv or more and 420 Hv or less.
  • the hardness of the base material 1a is higher than that of the base material 2a, and the difference therebetween is 30 Hv or more and 150 Hv or less.
  • the material of the base material of the segment is not limited to the above.
  • SUS, SWRH and the like are exemplified as the material of the base material of the segment.
  • martensitic stainless steel, silicon chromium steel, aluminum alloy, or the like may be used as the base material.
  • the difference in hardness between the substrate 1a and the substrate 2a may be 270 Hv or less, 200 Hv or less, or 180 Hv or less.
  • the outer coating 1b and the outer coating 2b according to this example are formed as DLC coatings with high abrasion resistance.
  • the outer coating is not limited to the DLC treatment coating, and includes at least one layer of a nitriding coating, a Ni-P plating coating, a chromium plating coating, a PVD coating, and a DLC coating. may be formed as
  • the outer coating 1b of the upper segment 1 and the outer coating 2b of the lower segment 2 may have different configurations.
  • the outer coating is not an essential configuration in the present invention, and either or both of the upper segment and the lower segment may not have the outer coating.
  • the axial end faces (upper surface 13 and lower surface 14) of the upper segment 1 and the axial end faces (upper surface 23 and lower surface 24) of the lower segment 2 are coated with a coating, a resin coating, a chemical conversion coating, an oxidation coating, and a nitriding coating.
  • a surface treatment film including at least one layer of a treatment film, a Ni—P plating treatment film, a chromium plating treatment film, a PVD treatment film, and a DLC treatment film may be formed.
  • coating film refers to a film formed by applying paint.
  • a "resin coating” refers to a coating formed of a resin material.
  • Examples of the "coating film” and “resin coating” include a resin coating film made of water-based or oil-based resin paint.
  • “Chemical conversion coating” refers to a coating formed by chemical conversion treatment. Examples of chemical conversion treatments include triiron tetraoxide treatment (blackening), phosphate treatment, and chromate treatment. Examples of phosphate treatment include manganese phosphate treatment, zinc phosphate treatment, and iron phosphate treatment.
  • a “nitriding coating” refers to a coating formed by infiltrating nitrogen into a metal surface by nitriding.
  • “Oxidation treatment film” refers to a film formed by oxidizing a metal surface by oxidation treatment. Examples of oxidation treatment include alumite treatment.
  • Ni—P plating film refers to a film formed by electroless Ni—P plating.
  • chromium-plated film refers to a film formed by chromium plating. Chrome plating is also called industrial chrome plating.
  • PVD physical vapor deposition
  • a “DLC (Diamond Like Carbon) treated coating” refers to an amorphous hard carbon coating mainly composed of hydrocarbons and allotropes of carbon.
  • the wear resistance of the base material 1a of the upper segment 1 arranged on the combustion chamber side is higher than the wear resistance of the base material 2a of the lower segment 2 arranged on the crank chamber side.
  • the base material 1a and the base material 2a are made of different materials so as to be higher than the abrasion resistance.
  • the material of the base material 1a is SWRH72A
  • the material of the base material 2a of the lower segment 2 is SUS440B, so that the hardness of the base material 1a is higher than that of the base material 2a.
  • FIG. 2 is a schematic diagram showing the configuration of the reciprocating friction tester.
  • a reciprocating friction test using a reciprocating friction tester is performed using a pin-on plate type reciprocating friction tester whose outline is shown in FIG.
  • the upper test piece used in the reciprocating motion friction test is a pin which is assumed to be the base material of the segment, and the material of the pin is the same as the wire material for the segment.
  • the pin used for the upper test piece has a diameter of 8 mm, and the tip (sliding surface) of the pin is mirror-finished so as to have a radius of curvature of 18 mm.
  • a plate (equivalent to AC8A material) that resembles a piston is used as the lower test piece.
  • FIG. 3 is a graph showing the results of the reciprocating friction test, showing the wear amount ratio.
  • the oil ring 40 is configured such that the wear resistance of the base material 1a of the upper segment 1 is higher than the wear resistance of the base material 2a of the lower segment 2.
  • 2 are made of different materials.
  • the material of the base material 1a is a SWRH material having higher hardness than the SUS material that is the material of the base material 2a.
  • the oil ring 40 according to the embodiment can be suitably used for gasoline engines and engines using low-viscosity oil in which there are many chances of direct contact between the segments and the inner wall of the ring groove.
  • the internal combustion engine to which the oil ring according to the present invention is applied is not limited to these.
  • the material of the base material 1a of the upper segment 1 and the material of the base material 2a of the lower segment 2 are made different so that the hardness of the base material 1a is higher than that of the base material 2a. By making it higher, the wear resistance of the base material 1a is made higher than the wear resistance of the base material 2a.
  • the difference in hardness between the base material 1a and the base material 2a is not particularly limited. It is preferable to make it higher than 30Hv.
  • the pair of segments 1 and 2 are made different in surface color by making the base materials of the pair of segments 1 and 2 different. Thereby, the identifiability of the pair of segments 1 and 2 can be improved.
  • Modification 1 In the oil ring 40 of Modification 1, while the material of the base material 1a of the upper segment 1 and the material of the base material 2a of the lower segment 2 are the same, the wear resistance of the base material 1a of the upper segment 1 is higher than that of the lower segment.
  • the hardness of the base material of the pair of segments 1 and 2 is made different from each other so that the wear resistance of the base material 2a of the pair of segments 1 and 2 is higher than that of the base material 2a of the pair of segments.
  • the hardness can be varied by varying the manner of heat treatment.
  • the wear resistance of the upper segment 1 is increased and deterioration of the oil seal function is prevented. be able to.
  • the difference in hardness between the base material 1a and the base material 2a is not particularly limited, but the hardness of the base material 1a of the upper segment 1 is preferably higher than that of the base material 2a of the lower segment 2 by 30 Hv or more.
  • the oil ring 40 of Modified Example 2 is configured such that the base material surfaces of the pair of segments 1 and 2 are arranged such that the wear resistance of the base material 1a of the upper segment 1 is higher than the wear resistance of the base material 2a of the lower segment 2.
  • the carbide occupied area ratio (carbide precipitation rate) in is different from each other.
  • the carbide occupied area ratio refers to the ratio of the area of carbide occupying the surface of the segment.
  • the carbide occupied area ratio can be obtained, for example, by acquiring an image of the substrate surface with a metallurgical microscope after etching treatment with a marble reagent, binarizing the acquired image, and calculating the area ratio of the white portion.
  • the method for calculating the carbide occupied area ratio is not limited to this.
  • the base material 1a of the upper segment 1 and the base material 2a of the lower segment 2 are made of stainless steel with different carbon and chromium contents. More specifically, the base material 1a of the upper segment 1 is made of 17 chromium SUS material, which is martensitic stainless steel containing a large amount of chromium, and the base material 2a of the lower segment 2 is made of stainless steel with a slightly low chromium content. 13 chromium SUS material, which is steel, is used as the material. However, the material of the segment according to the present invention is not limited to this.
  • the carbide occupied area ratio of the base material 1a of the upper segment 1 is 7.2% to 15.3% by the above calculation method, and the carbide occupied area ratio of the base material 2a of the lower segment 2 is 0.2. % to 2.0%. That is, in Modification 2, the substrate 1a of the upper segment 1 has a higher carbide occupied area ratio than the substrate 2a of the lower segment 2, and the difference is 5.2% or more.
  • the material of the base material 1a of the upper segment 1 and the material of the base material 2a of the lower segment 2 may be the same.
  • the size of the carbides can be changed by, for example, different heat treatment methods, and the carbide occupied area ratios can be varied.
  • the upper segment 1 and the lower segment 2 may be made of different base material materials so that the carbide occupied area ratios are different from each other.
  • the pair of segments 1 and 2 are arranged such that the carbide occupied area ratio of the base material 1a of the upper segment 1 is higher than the carbide occupied area ratio of the base material 2a of the lower segment 2.
  • the substrates are made different from each other.
  • the carbide occupied area ratio of the base material 1a of the upper segment 1 higher than the carbide occupied area ratio of the base material 2a of the lower segment 2
  • the wear resistance of the upper segment 1 is improved and the deterioration of the oil seal function is prevented. be able to.
  • the difference in the carbide occupied area ratio between the base material 1a and the base material 2a is not particularly limited.
  • the surface colors of the pair of segments 1 and 2 are made different from each other by making the carbide occupied area ratios of the base material surfaces of the pair of segments 1 and 2 different. Thereby, the identifiability of the pair of segments 1 and 2 can be improved.
  • the abrasion resistance of the base material of the segment according to Modification 2 was evaluated by the reciprocating friction test described above.
  • a reciprocating friction test was performed on each of the pins representing the base material 1a of the upper segment 1 as an upper test piece C and the pin representing the base material 2a of the lower segment 2 as an upper test piece D to compare the amount of wear.
  • the material of the upper test piece C was the same 17 chromium SUS material as the base material 1a
  • the material of the upper test piece D was the same 13 chromium SUS material as the base material 2a.
  • the carbide occupied area ratio of the upper test piece C was set to 7.2% to 15.3% by the above calculation method, and the carbide occupied area ratio of the upper test piece D was set to 0.2% to 2.0%.
  • FIG. 4 is a graph showing the results of the reciprocating friction test, showing the wear amount ratio. As shown in FIG. 4, the upper test piece C of the upper segment 1 having a larger carbide occupied area ratio had higher wear resistance than the upper test piece D of the lower segment 2 .

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

La présente invention concerne une bague de lubrification qui comprend : une paire de segments qui sont formés selon une direction de périmètre de la bague de lubrification et qui sont disposés en réseau dans la direction axiale de la bague de lubrification, indépendamment l'un de l'autre, avec une tige de fil annulaire en tant que matériau de base pour chacun ; et un dispositif d'expansion d'espace qui est disposé entre la paire de segments. De la paire de segments, le matériau de base d'un segment côté supérieur qui est situé sur un côté de chambre de combustion dans un moteur à combustion interne présente une résistance à l'usure supérieure à celle du matériau de base d'un segment côté inférieur de la paire de segments qui est situé sur un côté de chambre de vilebrequin dans le moteur à combustion interne.
PCT/JP2022/024541 2021-08-05 2022-06-20 Bague de lubrification WO2023013264A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202280054486.XA CN117836542B (zh) 2021-08-05 2022-06-20 油环

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021-128653 2021-08-05
JP2021128653A JP7312792B2 (ja) 2021-08-05 2021-08-05 オイルリング

Publications (1)

Publication Number Publication Date
WO2023013264A1 true WO2023013264A1 (fr) 2023-02-09

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ID=85155788

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Application Number Title Priority Date Filing Date
PCT/JP2022/024541 WO2023013264A1 (fr) 2021-08-05 2022-06-20 Bague de lubrification

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JP (1) JP7312792B2 (fr)
CN (1) CN117836542B (fr)
WO (1) WO2023013264A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62294152A (ja) * 1986-06-12 1987-12-21 Hitachi Metals Ltd 耐摩耗部材
JPH0464656U (fr) * 1990-10-16 1992-06-03
JPH11101189A (ja) * 1997-09-26 1999-04-13 Nippon Piston Ring Co Ltd 回転式圧縮機
JP2019124288A (ja) * 2018-01-16 2019-07-25 Ｔｐｒ株式会社 組合せオイルリング
JP2020026805A (ja) * 2018-08-09 2020-02-20 Ｔｐｒ株式会社 組合せオイルリング

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101709463B (zh) * 2009-11-30 2011-04-27 华南理工大学 一种改善奥氏体不锈钢壳体耐磨耐蚀性的表面处理方法
US20130328274A1 (en) * 2011-02-28 2013-12-12 Nippon Piston Ring Co., Ltd. Piston ring
JP5638548B2 (ja) * 2012-02-13 2014-12-10 三菱重工業株式会社 遮熱コーティングならびにこれを用いたガスタービン部品およびガスタービン
RU2625419C1 (ru) * 2016-07-18 2017-07-13 Федеральное государственное бюджетное образовательное учреждение высшего образования "Казанский национальный исследовательский технический университет им. А.Н. Туполева-КАИ" (КНИТУ-КАИ) Маслосъемное поршневое устройство двигателя внутреннего сгорания
WO2019189532A1 (fr) * 2018-03-28 2019-10-03 日立金属株式会社 Composant résistant à l'usure

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62294152A (ja) * 1986-06-12 1987-12-21 Hitachi Metals Ltd 耐摩耗部材
JPH0464656U (fr) * 1990-10-16 1992-06-03
JPH11101189A (ja) * 1997-09-26 1999-04-13 Nippon Piston Ring Co Ltd 回転式圧縮機
JP2019124288A (ja) * 2018-01-16 2019-07-25 Ｔｐｒ株式会社 組合せオイルリング
JP2020026805A (ja) * 2018-08-09 2020-02-20 Ｔｐｒ株式会社 組合せオイルリング

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JP7312792B2 (ja) 2023-07-21
CN117836542A (zh) 2024-04-05
JP2023023288A (ja) 2023-02-16
CN117836542B (zh) 2025-02-21

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