JP2006349019A - Combined oil ring - Google Patents

Combined oil ring Download PDF

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JP2006349019A
JP2006349019A JP2005174778A JP2005174778A JP2006349019A JP 2006349019 A JP2006349019 A JP 2006349019A JP 2005174778 A JP2005174778 A JP 2005174778A JP 2005174778 A JP2005174778 A JP 2005174778A JP 2006349019 A JP2006349019 A JP 2006349019A
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oil ring
peripheral
oil
film
expander
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JP4749048B2 (en
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Takaji Iwashita
誉二 岩下
Masao Ishida
政男 石田
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Teikoku Piston Ring Co Ltd
帝国ピストンリング株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a combined oil ring capable of holding performance of a low tensile strength oil ring from the initial time and maintaining it for a long time. <P>SOLUTION: This combined oil ring is composed of the oil ring 1 and a coil expander 2 for pressing it outward in the radial direction. An amorphous hard carbon system coating 10 is formed in a part in contact with the coil expander 2 on an inner peripheral face of the oil ring 1. An inner peripheral side edge of an oil return hole 6 provided in the oil ring 1 has a circular arc shape. Hardness of the amorphous hard carbon system coating 10 is HV 700 to 2000, and thickness of the coating is 0.8 to 10 μm. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、内燃機関用組合せオイルリングに関し、特にシリンダボアとの間で低フリクション化を可能にする組合せオイルリングに関する。   The present invention relates to a combined oil ring for an internal combustion engine, and more particularly to a combined oil ring that enables low friction with a cylinder bore.
内燃機関には、オイルリングとエキスパンダとからなる2ピース形の鋼製組合せオイルリングが使用されている。この組合せオイルリングはディーゼルエンジンに多く使用されているが、最近では、摩耗による張力減退率が低く、耐久性に優れていることからガソリンエンジンでも多く使用されている。そして、近年の低燃費化の要求から、オイルリングにおいても低フリクションを目的とした低張力化が進められている。   The internal combustion engine uses a two-piece steel combination oil ring composed of an oil ring and an expander. This combination oil ring is widely used in diesel engines, but recently, it is also frequently used in gasoline engines because of its low rate of tension reduction due to wear and excellent durability. In response to the recent demand for lower fuel consumption, lowering of tension for the purpose of low friction is also being promoted in oil rings.
2ピース組合せオイルリングにおいて、張力を低下させると、オイルリングがエキスパンダとのフリクションの影響によりシリンダボアに対する追従性が低下し、オイルリング内周面とエキスパンダ外周面のなじみがでるまでオイルリングの機能が低下し、オイル消費が多くなってしまう傾向がある。特に近年の低張力化でその傾向は大きくなっている。オイルリングの内周面とエキスパンダとのなじみや耐摩耗性を改善する方法として、以下の特許文献にあるように、各種の表面処理が提案されている。   In a two-piece combined oil ring, if the tension is reduced, the oil ring will be less able to follow the cylinder bore due to the effect of friction with the expander, and until the oil ring inner peripheral surface and the expander outer peripheral surface become familiar, Function tends to decrease and oil consumption tends to increase. In particular, the tendency is increasing with the recent low tension. Various surface treatments have been proposed as methods for improving the familiarity and wear resistance between the inner peripheral surface of the oil ring and the expander, as described in the following patent documents.
(1)滑り特性の向上及びクッション効果を狙って、オイルリング内周面に耐摩耗性合成樹脂皮膜を施す(特許文献1)。
(2)耐摩耗性向上のために、オイルリング内周面とコイルエキスパンダとにCrめっき皮膜又は窒化層を形成する(特許文献2)。
(3)耐摩耗性向上のために、オイルリング内周面及びコイルエキスパンダに窒化層を形成する(特許文献3)。
(4)摩擦抵抗を低減して、ピストンへの組付け性の改善を図るために、オイルリング内周面に燐酸塩皮膜を形成し、コイルエキスパンダに窒化層を形成する(特許文献4)。
(5)耐摩耗性向上のために、オイルリング内周面にNi系合金めっき皮膜を形成する(特許文献5)。
(6)耐摩耗性向上のため、オイルリング内周面とコイルエキスパンダとにCrめっき皮膜を形成する(特許文献6)。
実公昭48−8963号公報 特公平3−29979号公報 実開昭60−65474号公報 実開昭63−168362号公報 特開平9−42451号公報 実開昭48−14114号公報
(1) A wear-resistant synthetic resin film is applied to the inner peripheral surface of the oil ring for the purpose of improving the sliding characteristics and cushioning effect (Patent Document 1).
(2) In order to improve wear resistance, a Cr plating film or a nitride layer is formed on the inner peripheral surface of the oil ring and the coil expander (Patent Document 2).
(3) A nitride layer is formed on the inner peripheral surface of the oil ring and the coil expander to improve wear resistance (Patent Document 3).
(4) In order to reduce the frictional resistance and improve the assembly to the piston, a phosphate film is formed on the inner peripheral surface of the oil ring, and a nitride layer is formed on the coil expander (Patent Document 4). .
(5) To improve wear resistance, a Ni-based alloy plating film is formed on the inner peripheral surface of the oil ring (Patent Document 5).
(6) To improve wear resistance, a Cr plating film is formed on the inner peripheral surface of the oil ring and the coil expander (Patent Document 6).
Japanese Utility Model Publication No. 48-8963 Japanese Patent Publication No. 3-29979 Japanese Utility Model Publication No. 60-65474 Japanese Utility Model Publication No. 63-168362 JP-A-9-42451 Japanese Utility Model Publication No. 48-14114
オイルリング外周面とシリンダ内周面のフリクション低減のためには、コイルエキスパンダの押圧力を低下させ、オイルリングの張力を低くすると効果がある。しかしながら、張力を低下させると、オイルリング内周とコイルエキスパンダとのフリクションが大きい場合、オイルリングがエキスパンダとのフリクションの影響によりシリンダボアに対する追従性が低下し、オイルリング内周面とエキスパンダ外周面のなじみがでるまでオイルリングの機能が低下し、オイル消費が多くなってしまう傾向がある。なじみがでるまでに長時間を要すると、オイル消費が多くなる。   In order to reduce the friction between the outer peripheral surface of the oil ring and the inner peripheral surface of the cylinder, it is effective to reduce the pressing force of the coil expander and reduce the tension of the oil ring. However, when the tension is reduced, if the friction between the oil ring inner periphery and the coil expander is large, the oil ring will be less able to follow the cylinder bore due to the friction with the expander, and the oil ring inner peripheral surface and the expander Until the familiarity of the outer peripheral surface is obtained, the function of the oil ring is lowered, and the oil consumption tends to increase. If it takes a long time to become familiar, oil consumption increases.
特許文献1,4では、オイルリング内周面に合成樹脂皮膜や燐酸塩皮膜を形成することが提案されているが、耐摩耗性が低く、摩耗による径の変化から張力値が減少してしまうため、短時間で機能低下を招く場合がある。   In Patent Documents 1 and 4, it is proposed to form a synthetic resin film or a phosphate film on the inner peripheral surface of the oil ring, but the wear resistance is low, and the tension value decreases due to a change in diameter due to wear. For this reason, the function may be degraded in a short time.
特許文献2,3,5,6では、オイルリング内周面にCrめっき皮膜、窒化層、あるいはNi系合金めっき皮膜を形成することが提案され、特許文献2,3,6ではエキスパンダに窒化層やCrめっき皮膜を形成することが提案されている。これらの皮膜は、処理後の表面あらさが大きくなり、エキスパンダによる押圧力が低い場合には、なじみがでるまでに長時間を要することが多いため、オイル消費が多くなってしまう傾向がある。   In Patent Documents 2, 3, 5, and 6, it is proposed to form a Cr plating film, a nitride layer, or a Ni-based alloy plating film on the inner peripheral surface of the oil ring, and in Patent Documents 2, 3, and 6, nitriding is performed on the expander. It has been proposed to form a layer or a Cr plating film. These coatings have a large surface roughness after treatment, and when the pressing force by the expander is low, since it often takes a long time to become familiar, oil consumption tends to increase.
本発明が解決しようとする課題は、低張力オイルリングの性能を初期から保持し、かつ長時間維持できる組合せオイルリングを提供することである。   The problem to be solved by the present invention is to provide a combined oil ring that maintains the performance of a low-tension oil ring from the beginning and can maintain it for a long time.
上記課題を解決するために本発明は次の解決手段を採る。すなわち、
本発明は、オイルリングとこれを半径方向外方に押圧するエキスパンダとを有する組合せオイルリングにおいて、エキスパンダと接触する面であるオイルリングの内周面に非晶質硬質炭素系皮膜が形成され、オイルリングに設けられているオイル戻し孔の内周側エッジが円弧形状を有することを特徴とする。
In order to solve the above problems, the present invention employs the following means. That is,
The present invention relates to a combined oil ring having an oil ring and an expander that presses the outer ring outward in the radial direction, and an amorphous hard carbon film is formed on the inner peripheral surface of the oil ring that is a surface in contact with the expander The inner edge of the oil return hole provided in the oil ring has an arc shape.
上記非晶質硬質炭素系皮膜の硬度はHV700〜2000で、膜厚は0.8〜10μmであることが望ましい。   The amorphous hard carbon film preferably has a hardness of HV 700 to 2000 and a film thickness of 0.8 to 10 μm.
本発明の組合せオイルリングは、オイルリングの内周面に低摩擦係数を有する非晶質硬質炭素系皮膜が形成されているので、低張力であっても、エキスパンダがオイルリング内周面に対して抵抗少なく摺動できるため、オイルリングのシリンダボアへの追従性が良好で、優れたオイル消費性能を初期から発揮できる。また、非晶質硬質炭素系皮膜は耐摩耗性に優れているため、オイル消費性能を長時間維持できる。このように、非晶質硬質炭素系皮膜は低摩擦係数を有し、耐摩耗性が高く、また、処理後の表面粗さを0.5μmRz以下の薄く均一な皮膜を形成できるため、低張力オイルリングであっても優れたオイル消費性能を初期から長時間維持できる。ただし、非晶質硬質炭素系皮膜は、オイルリングに設けられているオイル戻し孔の内周側エッジにおいてそのエッジ効果から皮膜が厚く形成される場合があり、摩擦係数の低い皮膜でも段差となり、コイルエキスパンダが引っかかり追従性の妨げとなるので、オイル戻し孔の内周側エッジは円弧形状とする。   Since the combination oil ring of the present invention has an amorphous hard carbon film having a low friction coefficient formed on the inner peripheral surface of the oil ring, the expander is attached to the inner peripheral surface of the oil ring even at low tension. On the other hand, since it can slide with little resistance, the oil ring has good followability to the cylinder bore and can exhibit excellent oil consumption performance from the beginning. Moreover, since the amorphous hard carbon film is excellent in wear resistance, the oil consumption performance can be maintained for a long time. As described above, the amorphous hard carbon film has a low coefficient of friction, high wear resistance, and can form a thin and uniform film with a surface roughness of 0.5 μmRz or less after the treatment. Even with an oil ring, excellent oil consumption performance can be maintained for a long time from the beginning. However, the amorphous hard carbon film may be formed thick due to its edge effect at the inner peripheral edge of the oil return hole provided in the oil ring, and even a film with a low coefficient of friction becomes a step, Since the coil expander is caught and obstructs the followability, the inner peripheral edge of the oil return hole has an arc shape.
非晶質硬質炭素系皮膜の硬度はHV700より小さいと摩耗速度が速くなり、HV2000より高くなると皮膜の欠け、剥離の発生が見られる場合がある。したがって、皮膜の硬度はHV700〜HV2000の範囲とするのが好ましい。皮膜の厚さは0.8μmより小さいと耐久性が不足し、10μmを越える皮膜は必要ない。よって、皮膜の厚さは0.8〜10μmとするのが好ましい。   When the hardness of the amorphous hard carbon film is smaller than HV700, the wear rate is increased, and when it is higher than HV2000, the film may be chipped or peeled off. Therefore, the hardness of the coating is preferably in the range of HV700 to HV2000. If the thickness of the film is less than 0.8 μm, the durability is insufficient, and a film exceeding 10 μm is not necessary. Therefore, the thickness of the film is preferably 0.8 to 10 μm.
なお、エキスパンダの外周面に非晶質硬質炭素系皮膜を形成することも考えられるが、エキスパンダは常にオイルリングに押し付けられながら動いているので、皮膜の密着性が悪いと剥離が発生し、オイルリング内周面とコイルエキスパンダ外周面の摺動抵抗が大きくなり、シリンダボアへの追従性が悪化し、オイル消費を増加させる可能性がある。   Although it is conceivable to form an amorphous hard carbon film on the outer peripheral surface of the expander, the expander always moves while being pressed against the oil ring, so peeling occurs if the film adhesion is poor. The sliding resistance between the inner peripheral surface of the oil ring and the outer peripheral surface of the coil expander is increased, the followability to the cylinder bore is deteriorated, and oil consumption may be increased.
以下、本発明の好ましい一実施形態を図面に基いて説明する。   Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.
図1において、組合せオイルリングは鋼製のオイルリング1と、コイルエキスパンダ2とからなっている。オイルリング1は断面略I字形をなし、上下のレール3,4と、これらを連結する薄肉の真直ぐなウェブ5とからなっている。ウェブ5には円周方向に等間隔をおいてオイル戻し孔6が複数、形成されている。7は、上下のレール3,4の外周摺動面で掻き取ったオイルの受容溝で、上下のレール3,4の外周側突起部とウェブ5とで形成されている。   In FIG. 1, the combination oil ring includes a steel oil ring 1 and a coil expander 2. The oil ring 1 has a substantially I-shaped cross section, and includes upper and lower rails 3 and 4 and a thin straight web 5 that connects these rails. A plurality of oil return holes 6 are formed in the web 5 at equal intervals in the circumferential direction. Reference numeral 7 denotes an oil receiving groove scraped by the outer peripheral sliding surfaces of the upper and lower rails 3 and 4, and is formed by the outer peripheral projections of the upper and lower rails 3 and 4 and the web 5.
8は、上下のレール3,4の内周側突起部とウェブ5とで形成されたコイルエキスパンダ2の収容溝である。コイルエキスパンダ2はこの収容溝8に配置され、オイルリング1を半径方向外方に押圧付勢し、オイルリング1の外周摺動面をシリンダ内周面に押接させる。コイルエキスパンダ2は円形断面の線材をコイル状に巻いたものを環状に形成したものである。なお、本実施形態では、コイルエキスパンダ収容溝8は円弧面に形成されているが、これに限られることはない。また、コイルエキスパンダ2の線材の断面形状も円の他、一部切欠円、矩形等の形状が適宜選択される。   Reference numeral 8 denotes a receiving groove of the coil expander 2 formed by the inner peripheral protrusions of the upper and lower rails 3 and 4 and the web 5. The coil expander 2 is disposed in the housing groove 8 and presses and urges the oil ring 1 radially outward to press the outer peripheral sliding surface of the oil ring 1 against the inner peripheral surface of the cylinder. The coil expander 2 is formed by annularly winding a wire having a circular cross section into a coil shape. In the present embodiment, the coil expander accommodating groove 8 is formed in an arc surface, but is not limited thereto. In addition, the cross-sectional shape of the wire material of the coil expander 2 is appropriately selected from shapes such as a partially cut circle and a rectangle in addition to a circle.
オイルリング1の外周摺動面には所定の耐摩耗性皮膜9が形成されている。オイルリング1の内周面においてコイルエキスパンダ2と接触する部分には非晶質硬質炭素系皮膜10が形成されている。図2に示されているように、オイル戻し孔6の内周側エッジは母材面が円弧形状に形成されており、非晶質硬質炭素系皮膜10の表面も円弧形状とされている。非晶質硬質炭素系皮膜10の硬度はHV700〜2000、皮膜の厚さは0.8〜10μmの範囲で選定されている。コイルエキスパンダ2の外表面には耐摩耗性を付与する表面処理は施されていない。なお、コイルエキスパンダ2の外表面にはCrめっきや窒化層等の耐摩耗性表面処理を施す場合もある。   A predetermined wear-resistant film 9 is formed on the outer peripheral sliding surface of the oil ring 1. An amorphous hard carbon-based film 10 is formed on the inner peripheral surface of the oil ring 1 at a portion in contact with the coil expander 2. As shown in FIG. 2, the inner peripheral edge of the oil return hole 6 has a base material surface formed in an arc shape, and the surface of the amorphous hard carbon film 10 is also formed in an arc shape. The hardness of the amorphous hard carbon film 10 is selected in the range of HV 700 to 2000, and the thickness of the film is 0.8 to 10 μm. The outer surface of the coil expander 2 is not subjected to a surface treatment that imparts wear resistance. The outer surface of the coil expander 2 may be subjected to wear-resistant surface treatment such as Cr plating or a nitride layer.
以下、本発明に係る組合せオイルリングと各種比較例の組合せオイルリングとについて、20時間運転後の張力減退率を求めた試験について説明する。   Hereinafter, the test which calculated | required the tension | tensile_strength decline rate after a 20-hour driving | operation about the combination oil ring which concerns on this invention and the combination oil ring of various comparative examples is demonstrated.
表1に示す本発明及び比較例の組合せオイルリングがそれぞれ装着されたエンジンを使用した単気筒モータリング試験において、20時間の連続運転を実施し、各オイルリングの試験前張力と試験後張力を測定し、張力減退率を求めた。
張力減退率(%)=(試験前張力−試験後張力)/試験前張力×100
このモータリング試験は、図3に示されているように、モータ11でエンジン12を駆動するものである。試験条件は、ヘッド開放・水、オイルポンプ別駆動・オイル5W30・油、水温度80℃である。初期の状態から安定した張力を発生させることができれば、時間経過後での張力の低下がなく、オイルリングの機能を保つことができる。張力減退率が小さければその効果が大きい。表1に試験結果を示す。
In a single-cylinder motoring test using an engine equipped with the combination oil ring of the present invention and comparative example shown in Table 1, continuous operation for 20 hours was performed, and the pre-test tension and post-test tension of each oil ring were measured. Measurements were made to determine the rate of decrease in tension.
Tension decay rate (%) = (pre-test tension−post-test tension) / pre-test tension × 100
In this motoring test, the engine 12 is driven by the motor 11 as shown in FIG. Test conditions are head opening / water, driving by oil pump / oil 5W30 / oil, water temperature 80 ° C. If a stable tension can be generated from the initial state, the tension does not decrease after a lapse of time, and the function of the oil ring can be maintained. The effect is large if the tension reduction rate is small. Table 1 shows the test results.
注1)比較例2の膜厚は窒化深さである。
注2)比較例7はコイルエキスパンダ外周に3.0μmの膜厚で非晶質硬質炭素系皮膜が形成され、オイルリング内周に10.0μmの膜厚でCrめっき皮膜を形成したものである。
注3)実施例及び比較例とも、オイルリング内周面に皮膜形成後、ブラスト等の後処理は未実施である。
注4)実施例及び比較例(比較例7を除く。)のコイルエキスパンダの外表面には耐摩耗性を付与する表面処理は施されていない。
注5)張力減退率には、皮膜摩耗によるものの他に、オイルリング内周面とコイルエキスパンダとのなじみによるものが含まれる。
Note 1) The film thickness of Comparative Example 2 is the nitriding depth.
Note 2) In Comparative Example 7, an amorphous hard carbon film having a film thickness of 3.0 μm is formed on the outer periphery of the coil expander, and a Cr plating film having a film thickness of 10.0 μm is formed on the inner periphery of the oil ring. is there.
Note 3) After the film formation on the inner peripheral surface of the oil ring, post-treatment such as blasting has not been performed in both the example and the comparative example.
Note 4) The surface treatment for imparting wear resistance is not applied to the outer surface of the coil expander of the example and the comparative example (excluding comparative example 7).
Note 5) The rate of decrease in tension includes not only due to film wear but also due to the familiarity between the oil ring inner peripheral surface and the coil expander.
上記試験結果によれば、Crめっき皮膜(比較例1)、窒化層(比較例2)、非晶質硬質炭素系皮膜でオイル戻し孔の内周側エッジが鋭角(比較例5)のものは、いずれもなじみによる張力減退率が大きい。燐酸塩皮膜(比較例3)や樹脂皮膜(比較例4)のものは皮膜摩耗による張力減退率が大きい。非晶質硬質炭素系皮膜の硬度が大きい皮膜(比較例6)やコイルエキスパンダに非晶質硬質炭素系皮膜を形成(比較例7)のものは、剥離が発生し、張力減退率が大きい。これらに対して、実施例のものは張力減退率が低い。   According to the above test results, the Cr plating film (Comparative Example 1), the nitrided layer (Comparative Example 2), and the amorphous hard carbon film with the inner peripheral edge of the oil return hole having an acute angle (Comparative Example 5) In both cases, the rate of decrease in tension due to familiarity is large. The phosphate film (Comparative Example 3) and the resin film (Comparative Example 4) have a large rate of decrease in tension due to film abrasion. A film having a high hardness of the amorphous hard carbon-based film (Comparative Example 6) or an amorphous hard carbon-based film formed on the coil expander (Comparative Example 7) is peeled off and has a high rate of decrease in tension. . On the other hand, the tension reduction rate is low in the examples.
本発明の組合せオイルリングの一実施形態を示す断面図である。It is sectional drawing which shows one Embodiment of the combination oil ring of this invention. 図1の部分拡大図である。It is the elements on larger scale of FIG. モータリング試験機を示す図である。It is a figure which shows a motoring testing machine.
符号の説明Explanation of symbols
1・・オイルリング、2・・コイルエキスパンダ、3・・上レール、4・・下レール、5・・ウェブ、6・・オイル戻し孔、7・・オイル受容溝、8・・コイルエキスパンダ収容溝、9・・耐摩耗性皮膜、10・・非晶質硬質炭素系皮膜、11・・モータ、12・・エンジン。   1. ・ Oil ring, 2. ・ Coil expander, 3. ・ Upper rail, 4. ・ Lower rail, 5. ・ Web, 6. ・ Oil return hole, 7. ・ Oil receiving groove, 8. ・ Coil expander Housing groove, 9 ... Abrasion-resistant coating, 10.Amorphous hard carbon coating, 11 .... Motor, 12 .... Engine.

Claims (2)

  1. オイルリングとこれを半径方向外方に押圧するエキスパンダとを有する組合せオイルリングにおいて、エキスパンダと接触する面であるオイルリングの内周面に非晶質硬質炭素系皮膜が形成され、オイルリングに設けられているオイル戻し孔の内周側エッジが円弧形状を有することを特徴とする組合せオイルリング。   In a combined oil ring having an oil ring and an expander that presses this outward in the radial direction, an amorphous hard carbon film is formed on the inner peripheral surface of the oil ring that is a surface in contact with the expander, and the oil ring A combined oil ring characterized in that an inner peripheral edge of an oil return hole provided in the rim has an arc shape.
  2. 前記非晶質硬質炭素系皮膜の硬度がHV700〜2000で、膜厚が0.8〜10μmであることを特徴とする請求項1記載の組合せオイルリング。   The combination oil ring according to claim 1, wherein the amorphous hard carbon film has a hardness of HV 700 to 2000 and a film thickness of 0.8 to 10 µm.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011110411A2 (en) 2010-03-09 2011-09-15 Federal-Mogul Burscheid Gmbh Method for coating at least the inner face of a piston ring and piston ring

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6145172A (en) * 1982-10-26 1986-03-05 Teikoku Piston Ring Co Ltd Oil ring with coil expander
JPH0460160A (en) * 1990-06-28 1992-02-26 Usui Internatl Ind Co Ltd Piston ring
JPH08261325A (en) * 1995-03-27 1996-10-11 Nippon Piston Ring Co Ltd Oil ring with expander
JPH11315924A (en) * 1998-02-24 1999-11-16 Teikoku Piston Ring Co Ltd Combined oil ring spacer expander and combined oil ring
JP2002097573A (en) * 2000-09-19 2002-04-02 Riken Corp Sliding member
WO2004040174A1 (en) * 2002-10-29 2004-05-13 Toyota Jidousha Kabushiki Kaisha Oil ring

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6145172A (en) * 1982-10-26 1986-03-05 Teikoku Piston Ring Co Ltd Oil ring with coil expander
JPH0460160A (en) * 1990-06-28 1992-02-26 Usui Internatl Ind Co Ltd Piston ring
JPH08261325A (en) * 1995-03-27 1996-10-11 Nippon Piston Ring Co Ltd Oil ring with expander
JPH11315924A (en) * 1998-02-24 1999-11-16 Teikoku Piston Ring Co Ltd Combined oil ring spacer expander and combined oil ring
JP2002097573A (en) * 2000-09-19 2002-04-02 Riken Corp Sliding member
WO2004040174A1 (en) * 2002-10-29 2004-05-13 Toyota Jidousha Kabushiki Kaisha Oil ring

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011110411A2 (en) 2010-03-09 2011-09-15 Federal-Mogul Burscheid Gmbh Method for coating at least the inner face of a piston ring and piston ring
DE102010002687A1 (en) 2010-03-09 2011-09-15 Federal-Mogul Burscheid Gmbh Process for coating at least the inner surface of a piston ring and piston ring

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