JPS62120471A - Piston ring - Google Patents
Piston ringInfo
- Publication number
- JPS62120471A JPS62120471A JP25860085A JP25860085A JPS62120471A JP S62120471 A JPS62120471 A JP S62120471A JP 25860085 A JP25860085 A JP 25860085A JP 25860085 A JP25860085 A JP 25860085A JP S62120471 A JPS62120471 A JP S62120471A
- Authority
- JP
- Japan
- Prior art keywords
- piston ring
- layer
- chromium
- outer peripheral
- metallic chromium
- 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.)
- Granted
Links
Abstract
Description
【発明の詳細な説明】
〔発明の属する技術分野〕
この発明は、ピストンリングに関し、更に詳しくは耐焼
付き特性と耐摩耗特性を改善させた内燃機関用ピストン
リングに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a piston ring, and more particularly to a piston ring for an internal combustion engine with improved anti-seizure characteristics and anti-wear characteristics.
往復動内燃機関に使用されるピストンリングには高度な
耐摩耗特性が要求させる。それ故、ピストンリングの耐
摩耗特性を改善することを目的として、摺動面に硬質ク
ロムめっき層を形成させたピストンリングが内燃機関用
ピストンリングとして従来から多用されている。Piston rings used in reciprocating internal combustion engines require high wear resistance properties. Therefore, for the purpose of improving the wear resistance characteristics of piston rings, piston rings having a hard chromium plating layer formed on the sliding surfaces have been widely used as piston rings for internal combustion engines.
ところで、近年、内燃機関はますます高速化、高出力化
する趨勢にあり、また、高鉛ガソリンの使用による腐食
摩耗等の発生などの問題もあり。Incidentally, in recent years, internal combustion engines have become faster and more powerful, and there are also problems such as corrosion and wear due to the use of high-lead gasoline.
ピストンリングの使用条件がますます過酷なものとなり
、従来のクロムめっき層を有するピストンリングでは耐
摩耗耐焼き付き性が十分ではない場合があり、更に改善
された耐摩耗耐焼き付き性を有するピストンリングが望
まれいた。The usage conditions for piston rings are becoming increasingly harsh, and piston rings with conventional chrome plating layers may not have sufficient wear and seizure resistance. It was desired.
それ故、ピストンリングの耐摩耗耐焼き付き特性を更に
改善するための努力が従来から払われており、摺動面に
イオンブレーティング法により金属の窒化物あるいは炭
化物の皮膜を形成させたピストンリング（特開昭５７−
５７８６８号及び特開昭５７−６５８３７号）やピスト
ンリングの内外周および上下側面に窒化処理層を形成し
且つ外周面には窒化処理層の上に更に金属の窒化物（Ｔ
ｉＮおもしくはＣｒＮ）でなるイオンブレーティング層
を形成させたピストンリング（実開昭５９−１２６１５
９号）が提案されている。Therefore, efforts have been made to further improve the wear and seizure resistance properties of piston rings. Japanese Unexamined Patent Publication 1987-
57868 and JP-A-57-65837), a nitrided layer is formed on the inner and outer peripheries and upper and lower side surfaces of the piston ring, and a metal nitride (T) is further formed on the nitrided layer on the outer peripheral surface.
Piston ring with an ion brating layer formed of iN or CrN (Utility Model No. 59-12615)
No. 9) has been proposed.
金属の窒化物や炭化物は優れた耐摩耗特性を示す材料で
あるが、それ自体は極めて硬質で柔軟性に欠け、また、
熱膨張係数が金属のそれに較べて著しく小さいために、
金属母材との密着性が悪い。Metal nitrides and carbides are materials that exhibit excellent wear resistance, but they themselves are extremely hard and lack flexibility;
Because the coefficient of thermal expansion is significantly smaller than that of metals,
Poor adhesion to metal base material.
したがって、ピストンリングの摺動面に金属の窒化物層
や炭化物層を形成させる場合には、ピストンリング基材
との間で剥離を生じ易く、特にリング基材の表面に形成
された窒化処理層の上に更にこの種の窒化物層や炭化物
層を形成させる場合には窒化処理層がポーラスなため密
着性が十分でなく、窒化物層や炭化物層の剥離脱落が発
生し易いという問題がある。Therefore, when a metal nitride layer or carbide layer is formed on the sliding surface of the piston ring, separation from the piston ring base material is likely to occur, especially when the nitrided layer formed on the surface of the ring base material When this kind of nitride layer or carbide layer is further formed on top of the nitride layer, there is a problem that adhesion is insufficient because the nitrided layer is porous, and the nitride layer or carbide layer is likely to peel off. .
更に、イオンブレーティング法による金属窒化物や金属
炭化物の形成は皮膜の生成速度が遅く。Furthermore, when metal nitrides and metal carbides are formed by the ion blasting method, the rate of film formation is slow.
十分な厚さの被覆層を形成するには長時間を要するので
生産上置があり実用に供し得るものではなし）。Since it takes a long time to form a coating layer of sufficient thickness, there are production delays and it is not practical.)
この発明は、上記の難点を解消し過酷な使用条件下にお
いても十分な耐摩耗耐焼き付き特性を示す耐久性の良好
な内燃機関用ピストンリングを提供することを目的とし
てなされたものである。The present invention has been made for the purpose of solving the above-mentioned problems and providing a highly durable piston ring for an internal combustion engine that exhibits sufficient wear and seizure resistance even under severe usage conditions.
この発明は、鋳鉄又は鋼製ピストンリング基体の外周面
を除く上下側面及び内周面には窒化処理層が形成され、
ピストンリング外周側基体上には金属クロムと窒化クロ
ムとの均一微細な混合相でなる複合層が形成されたピス
トンリングとすることにより上記の目的を達成する。本
発明の内燃機関用ピストンリングの実施例を断面で示す
第１図において、鋳鉄材または鋼材でなるピストンリン
グ基体１の外周摺動面側２を除く上下側面には、従来の
方法により窒化処理層４．５が形成され。In this invention, a nitrided layer is formed on the upper and lower side surfaces and the inner circumferential surface of a cast iron or steel piston ring base excluding the outer circumferential surface,
The above object is achieved by providing a piston ring in which a composite layer consisting of a uniform fine mixed phase of metallic chromium and chromium nitride is formed on the outer circumferential base of the piston ring. In FIG. 1, which shows a cross section of an embodiment of a piston ring for an internal combustion engine according to the present invention, the upper and lower sides of a piston ring base 1 made of cast iron or steel, except for the outer sliding surface side 2, are treated with nitriding by a conventional method. Layer 4.5 is formed.
一方、外周摺動面側にはピストンリング基材」二に金属
クロムと窒化クロムとの微細均一な混合相でなる複合層
６が形成されている。本発明における金属クロムと窒化
クロムとの混合相でなる複合層相６は、窒素ガスの存在
する減圧雰囲気中で金属クロムをターゲツト材としてス
パッタリングをおこなう反応性イオンブレーティング法
に≠咄により形成される。On the other hand, on the outer peripheral sliding surface side, a composite layer 6 made of a fine and uniform mixed phase of metallic chromium and chromium nitride is formed on the piston ring base material. In the present invention, the composite layer phase 6 consisting of a mixed phase of metallic chromium and chromium nitride is formed by a reactive ion blasting method in which sputtering is performed using metallic chromium as a target material in a reduced pressure atmosphere in the presence of nitrogen gas. Ru.
本発明の複合暦日は高硬度（好ましくは硬度ＨｍＶ １
０００以上）とされいるが、金属クロムと窒化クロムと
の微細均一な混合相であるために、窒化クロム単身の場
合のような脆弱なものではなく、また、熱膨張係数も金
属クロムのそれに近くされている。The composite calendar date of the present invention has a high hardness (preferably hardness HmV 1
000 or more), but because it is a fine and uniform mixed phase of metallic chromium and chromium nitride, it is not as fragile as chromium nitride alone, and its thermal expansion coefficient is close to that of metallic chromium. has been done.
したがって、複合層６は、ピストンリング基材との密着
性婚が良好であり剥離脱落することがない。Therefore, the composite layer 6 has good adhesion to the piston ring base material and does not peel off.
また５本発明のピストンリングにあっては、その上下側
面および内周面に窒化処理層４．５形成され該側面に耐
摩耗性が付与されているが、外周摺動面の前記複合層６
は窒化処理層のないピストンリング基村上に形成されて
いる。したがって、該複合層の材質特性、即ち、脆弱で
なく且つ熱膨張係数が適正であることとあいまって、窒
化処理層上に金属窒化物層を形成させた従来のピストン
リングにおける剥離の問題の発生が効果的に防止される
。Further, in the piston ring of the present invention, the nitrided layer 4.5 is formed on the upper and lower side surfaces and the inner peripheral surface to impart wear resistance to the side surfaces, and the composite layer 6 on the outer peripheral sliding surface
is formed on a piston ring base plate without a nitrided layer. Therefore, due to the material properties of the composite layer, that is, it is not brittle and has an appropriate coefficient of thermal expansion, the problem of peeling occurs in conventional piston rings in which a metal nitride layer is formed on a nitrided layer. is effectively prevented.
なお、本発明のピストンリング基体外周面に形成される
金属クロムと窒化クロムとの複合層は、ＰＶＤ法、好ま
しくは減圧された窒素ガス雰囲気中で金属クロムを蒸発
させる反応性イオンブレーティング法を利用し、金属ク
ロムの蒸着過程で該金属クロムの一部を窒化クロムに転
換させて金属クロム相と窒化クロム相との微細均一な混
合相とすることで形成される。The composite layer of metallic chromium and chromium nitride formed on the outer peripheral surface of the piston ring base of the present invention can be formed by a PVD method, preferably a reactive ion blating method in which metallic chromium is evaporated in a reduced pressure nitrogen gas atmosphere. It is formed by converting a part of the metallic chromium into chromium nitride during the evaporation process of metallic chromium to form a fine and uniform mixed phase of a metallic chromium phase and a chromium nitride phase.
本発明において、複合層６を構成する成分をクロムとそ
の窒化物とした理由は、反応性イオンブレーティング法
によりリング基材表面に形成されるクロム相が該基材と
の密着性が良好であり、また、その熱膨張係数が該基材
のそれに近く、シたがって、ピストンリングの使用中に
おける複合層６の剥離脱落を防止する上で極めて好適で
あるからである。また、本発明で複合層６の構成成分と
して特にクロムを採用する他の理由は、イオンブレーテ
ィング法による金属クロムの蒸発速度が他の金属のそれ
に較べて大きく生産性の観点から極めて有効であること
による。In the present invention, the reason why chromium and its nitride are used as the components constituting the composite layer 6 is that the chromium phase formed on the surface of the ring base material by the reactive ion blasting method has good adhesion to the base material. In addition, its thermal expansion coefficient is close to that of the base material, and is therefore extremely suitable for preventing the composite layer 6 from peeling off during use of the piston ring. Another reason why chromium is particularly adopted as a component of the composite layer 6 in the present invention is that the evaporation rate of metallic chromium by the ion blating method is higher than that of other metals and is extremely effective from the viewpoint of productivity. It depends.
本発明のピストンリングの複合層６は、例えば、被処理
物を反応性イオンブレーティング装置の容器内にセット
し、 該容器内を排気して５Ｘ１０− ’Ｔｏｒｒ
程度の真空として後、被処理物を所定温度に加熱し、し
かる後、容器内にアルゴンガスを導入してＩ Ｘ １０
””Ｔｏｒｒ程度としボンバードにより被処理物表面
のクリーニングをおこない、ついで容器内に窒素ガスを
導入し所定の窒素ガス分圧にし、金属クロムを蒸発材と
してＨＣＤ型電子銃により蒸発させ蒸着処理をおこなう
ことにより形成される。ここで、処理中の被処理物温度
としては４００℃近辺の温度とすることが望ましく、ま
た、窒素ガス分圧としては、これが過度に大きいと金属
クロムと窒化クロムとが共存する混合層が形成されなく
なるので、Ｉ Ｘ １０−３Ｔｏｒｒ程度以下とするこ
とが望ましい。第１表に被処理物温度を４００℃とし、
種々の窒素ガス分圧において反応性イオンブレーティン
グをおこなって形成された被覆層について、その構成組
織と硬さを調べた結果を示す。なお、構成組織の調査は
Ｘ線解析によっておこなった。Ｘ線解析の結果を第２図
に示す。The composite layer 6 of the piston ring of the present invention can be formed by, for example, setting the object to be treated in a container of a reactive ion blating device, evacuating the inside of the container, and applying a pressure of 5X10-'Torr.
The object to be treated is heated to a predetermined temperature, and then argon gas is introduced into the container and
The surface of the object to be processed is cleaned by bombardment at a pressure of approximately 1.5 Torr, then nitrogen gas is introduced into the container to achieve a predetermined nitrogen gas partial pressure, and metallic chromium is evaporated using an HCD type electron gun as an evaporating agent to perform vapor deposition processing. It is formed by Here, it is desirable that the temperature of the workpiece during treatment be around 400°C, and if the nitrogen gas partial pressure is too high, a mixed layer where metal chromium and chromium nitride coexist will form. Therefore, it is desirable to set the IX to about 10-3 Torr or less. Table 1 shows the temperature of the object to be treated as 400°C.
The results of examining the structural structure and hardness of coating layers formed by reactive ion blating at various nitrogen gas partial pressures are shown. Note that the investigation of the constituent tissues was carried out by X-ray analysis. The results of the X-ray analysis are shown in Figure 2.
第１表
第１表および第２図から、窒素ガス分圧が高くなると、
得られる被覆層中の金属クロムが消失し、窒化クロム単
身のものとなり硬さも大きくなることが理解できる。From Table 1 and Figure 2, as the nitrogen gas partial pressure increases,
It can be seen that the metallic chromium in the resulting coating layer disappears and becomes chromium nitride alone, resulting in increased hardness.
以上の通りで、本発明のピストンリングはピストンリン
グ上下側面は窒化処理層によって耐摩耗性が付与され、
外周摺動面側にはピストンリング基材上に金属クロムと
窒化クロムとの微細均一な混合相でなる複合層が形成さ
せているので、耐摩耗性と耐焼き付き性に優れ、耐久性
が良好であり、エンジンの耐久性を向上させるうえで、
顕著な効果をしめす。As described above, the piston ring of the present invention is provided with wear resistance by the nitrided layer on the upper and lower side surfaces of the piston ring,
On the outer sliding surface side, a composite layer consisting of a finely uniform mixed phase of metallic chromium and chromium nitride is formed on the piston ring base material, resulting in excellent wear resistance and seizure resistance, and good durability. In order to improve the durability of the engine,
It shows a remarkable effect.
第１図は、本発明のピストンリングの断面図、第２図は
各試料の被覆層構成組織を示すＸ線解析チャート図であ
る。
図中： １．、、ピストンリング基体２０９．ピスト
ンリング基体の外周面
４９８．窒化処理層
５１３．窒化処理層FIG. 1 is a sectional view of a piston ring of the present invention, and FIG. 2 is an X-ray analysis chart showing the structure of the coating layer of each sample. In the diagram: 1. ,, piston ring base 209. Piston ring base outer peripheral surface 498. Nitriding layer 513. Nitriding layer
Claims (1)
及び内周面には窒化処理層が形成され、ピストンリング
基体の外周面には金属クロムと窒化クロムとの均一微細
な混合相でなる複合層が形成されていることを特徴とす
る内燃機関用ピストンリング。A nitriding layer is formed on the top, bottom, and inner surfaces of the cast iron or steel piston ring base excluding the outer peripheral surface, and a composite layer consisting of a uniform fine mixed phase of metallic chromium and chromium nitride is formed on the outer peripheral surface of the piston ring base. A piston ring for an internal combustion engine, characterized in that a layer is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60258600A JPH0625597B2 (en) | 1985-11-20 | 1985-11-20 | piston ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60258600A JPH0625597B2 (en) | 1985-11-20 | 1985-11-20 | piston ring |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62120471A true JPS62120471A (en) | 1987-06-01 |
| JPH0625597B2 JPH0625597B2 (en) | 1994-04-06 |
Family
ID=17322520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60258600A Expired - Fee Related JPH0625597B2 (en) | 1985-11-20 | 1985-11-20 | piston ring |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0625597B2 (en) |
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01159449A (en) * | 1987-12-15 | 1989-06-22 | Riken Corp | Piston ring with compound nitriding layer |
| JPH0273574A (en) * | 1988-09-09 | 1990-03-13 | Nec Corp | Coil assembly for positioning carriage of magnetic disk device |
| JPH0598419A (en) * | 1991-02-19 | 1993-04-20 | Sumitomo Metal Mining Co Ltd | Surface coated steel product and its manufacture |
| WO1995029271A1 (en) * | 1994-04-21 | 1995-11-02 | Kabushiki Kaisha Riken | Slide member and method of its production |
| FR2734881A1 (en) * | 1995-06-02 | 1996-12-06 | Dana Corp | PISTON RING AND METHOD FOR FORMING THE SAME |
| US5587227A (en) * | 1994-10-27 | 1996-12-24 | Kabushiki Kaisha Riken | Coating of chromium and nitrogen having good wear resistance properties |
| DE19630149A1 (en) * | 1995-07-25 | 1997-01-30 | Riken Kk | Sliding component and method for its production |
| US5672386A (en) * | 1994-10-27 | 1997-09-30 | Kabushiki Kaisha Riken | Process for forming a coating of chromium and nitrogen having good wear resistance properties |
| US5743536A (en) * | 1994-07-30 | 1998-04-28 | Kabushiki Kaisha Riken | Piston ring |
| US6508473B1 (en) | 1999-04-07 | 2003-01-21 | Teikoku Piston Ring Co., Ltd. | Piston ring |
| DE102004028486A1 (en) * | 2004-06-11 | 2005-12-29 | Mahle Gmbh | sliding |
| JP2007504337A (en) * | 2003-09-05 | 2007-03-01 | ザ ルブリゾル コーポレイション | Lubricating parts with partially hard coating that can reduce the amount of anti-wear additive |
| CN1321281C (en) * | 2002-08-27 | 2007-06-13 | 株式会社理研 | Side rail used for combination oil ring and method of nitriding the same |
| JP2007298103A (en) * | 2006-04-28 | 2007-11-15 | Nippon Piston Ring Co Ltd | Piston ring for internal combustion engine |
| EP2000560A1 (en) | 1999-07-08 | 2008-12-10 | Sumitomo Electric Industries, Ltd | Hard coating and coated member |
| JP2009287730A (en) * | 2008-05-30 | 2009-12-10 | Nippon Piston Ring Co Ltd | Piston ring |
| JP2010163694A (en) * | 1997-11-06 | 2010-07-29 | Dowa Holdings Co Ltd | NITROGEN-CONTAINING Cr FILM, AND MACHINE MEMBER HAVING THE FILM |
| CN103741105A (en) * | 2013-12-24 | 2014-04-23 | 中国印钞造币总公司 | Chrome-based coating film and preparation method thereof |
| US20170159816A1 (en) * | 2014-07-16 | 2017-06-08 | Federal-Mogul Burscheid Gmbh | Sliding element, in particular piston ring, and method for producing the same |
| US10030773B2 (en) | 2016-03-04 | 2018-07-24 | Mahle International Gmbh | Piston ring |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102011076453B4 (en) * | 2011-05-25 | 2013-08-01 | Federal-Mogul Burscheid Gmbh | Piston ring with composite coating |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59126159U (en) * | 1983-02-15 | 1984-08-24 | 日本ピストンリング株式会社 | piston ring |
| JPS59127858U (en) * | 1983-02-18 | 1984-08-28 | 日本ピストンリング株式会社 | piston ring |
| JPS60188661A (en) * | 1984-03-07 | 1985-09-26 | Nippon Piston Ring Co Ltd | Piston ring |
-
1985
- 1985-11-20 JP JP60258600A patent/JPH0625597B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59126159U (en) * | 1983-02-15 | 1984-08-24 | 日本ピストンリング株式会社 | piston ring |
| JPS59127858U (en) * | 1983-02-18 | 1984-08-28 | 日本ピストンリング株式会社 | piston ring |
| JPS60188661A (en) * | 1984-03-07 | 1985-09-26 | Nippon Piston Ring Co Ltd | Piston ring |
Cited By (27)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01159449A (en) * | 1987-12-15 | 1989-06-22 | Riken Corp | Piston ring with compound nitriding layer |
| JPH0273574A (en) * | 1988-09-09 | 1990-03-13 | Nec Corp | Coil assembly for positioning carriage of magnetic disk device |
| JPH0598419A (en) * | 1991-02-19 | 1993-04-20 | Sumitomo Metal Mining Co Ltd | Surface coated steel product and its manufacture |
| CN1066781C (en) * | 1994-04-21 | 2001-06-06 | 株式会社理研 | Slide member and method of its production |
| WO1995029271A1 (en) * | 1994-04-21 | 1995-11-02 | Kabushiki Kaisha Riken | Slide member and method of its production |
| CN1068388C (en) * | 1994-07-30 | 2001-07-11 | 株式会社理研 | Sliding material and method for preparing thereof |
| US5743536A (en) * | 1994-07-30 | 1998-04-28 | Kabushiki Kaisha Riken | Piston ring |
| US5851659A (en) * | 1994-07-30 | 1998-12-22 | Kabushiki Kaisha Riken | Sliding members and a method of preparation thereof |
| US5587227A (en) * | 1994-10-27 | 1996-12-24 | Kabushiki Kaisha Riken | Coating of chromium and nitrogen having good wear resistance properties |
| US5672386A (en) * | 1994-10-27 | 1997-09-30 | Kabushiki Kaisha Riken | Process for forming a coating of chromium and nitrogen having good wear resistance properties |
| FR2734881A1 (en) * | 1995-06-02 | 1996-12-06 | Dana Corp | PISTON RING AND METHOD FOR FORMING THE SAME |
| US5605741A (en) * | 1995-06-02 | 1997-02-25 | Dana Corporation | Hybrid face coating for piston ring |
| DE19630149A1 (en) * | 1995-07-25 | 1997-01-30 | Riken Kk | Sliding component and method for its production |
| DE19630149C2 (en) * | 1995-07-25 | 2001-11-29 | Riken Tokio Tokyo Kk | Sliding component and its use as a piston ring |
| GB2303640A (en) * | 1995-07-25 | 1997-02-26 | Riken Kk | Sliding member with film containing chromium and chromium nitride |
| JP2010163694A (en) * | 1997-11-06 | 2010-07-29 | Dowa Holdings Co Ltd | NITROGEN-CONTAINING Cr FILM, AND MACHINE MEMBER HAVING THE FILM |
| US6508473B1 (en) | 1999-04-07 | 2003-01-21 | Teikoku Piston Ring Co., Ltd. | Piston ring |
| EP2000560A1 (en) | 1999-07-08 | 2008-12-10 | Sumitomo Electric Industries, Ltd | Hard coating and coated member |
| CN1321281C (en) * | 2002-08-27 | 2007-06-13 | 株式会社理研 | Side rail used for combination oil ring and method of nitriding the same |
| JP2007504337A (en) * | 2003-09-05 | 2007-03-01 | ザ ルブリゾル コーポレイション | Lubricating parts with partially hard coating that can reduce the amount of anti-wear additive |
| DE102004028486A1 (en) * | 2004-06-11 | 2005-12-29 | Mahle Gmbh | sliding |
| JP2007298103A (en) * | 2006-04-28 | 2007-11-15 | Nippon Piston Ring Co Ltd | Piston ring for internal combustion engine |
| JP2009287730A (en) * | 2008-05-30 | 2009-12-10 | Nippon Piston Ring Co Ltd | Piston ring |
| CN103741105A (en) * | 2013-12-24 | 2014-04-23 | 中国印钞造币总公司 | Chrome-based coating film and preparation method thereof |
| US20170159816A1 (en) * | 2014-07-16 | 2017-06-08 | Federal-Mogul Burscheid Gmbh | Sliding element, in particular piston ring, and method for producing the same |
| US10697543B2 (en) * | 2014-07-16 | 2020-06-30 | Federal-Mogul Burscheid Gmbh | Sliding element, in particular piston ring, and method for producing the same |
| US10030773B2 (en) | 2016-03-04 | 2018-07-24 | Mahle International Gmbh | Piston ring |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0625597B2 (en) | 1994-04-06 |
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| LAPS | Cancellation because of no payment of annual fees |