JP2559284B2 - Piston ring and manufacturing method thereof - Google Patents
Piston ring and manufacturing method thereofInfo
- Publication number
- JP2559284B2 JP2559284B2 JP2076233A JP7623390A JP2559284B2 JP 2559284 B2 JP2559284 B2 JP 2559284B2 JP 2076233 A JP2076233 A JP 2076233A JP 7623390 A JP7623390 A JP 7623390A JP 2559284 B2 JP2559284 B2 JP 2559284B2
- Authority
- JP
- Japan
- Prior art keywords
- piston ring
- hard
- outer peripheral
- sliding surface
- plating layer
- 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.)
- Expired - Fee Related
Links
Landscapes
- Pistons, Piston Rings, And Cylinders (AREA)
- Physical Vapour Deposition (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は内燃機関用のピストンリング及びその製造方
法に関する。Description: TECHNICAL FIELD The present invention relates to a piston ring for an internal combustion engine and a method for manufacturing the piston ring.
近年の自動車用内燃機関は、高速、高出力化の傾向が
著しい。このため、ピストンリングの受ける熱負荷はよ
り大きくなっており、このもとでの耐スカッフ性、耐摩
耗性が重要となってきた。従来、一般的に用いられてき
たピストンリングの摺動面の表面処理は、硬質Crめっき
あるいは窒化処理である。これらは耐スカッフ性の面で
充分とは言えない。最近、ピストンリングの表面処理と
して、硬質Crめっき以上の耐摩耗性、耐スカッフ性を示
すPVD処理が注目されてきた（特開昭57−57868号、特開
昭57−65837号、特開昭58−35648号等参照）。そして、
実公平１−22922号及び特公平１−33658号には、硬質Cr
めっき層の上にPVD処理による硬質皮膜を被覆したピス
トンリングが記述されている。BACKGROUND ART In recent years, internal combustion engines for automobiles have a remarkable tendency toward high speed and high output. For this reason, the heat load on the piston ring has become larger, and under this condition, scuff resistance and wear resistance have become important. Conventionally, the surface treatment of the sliding surface of the piston ring that has been generally used is hard Cr plating or nitriding treatment. These are not sufficient in terms of scuff resistance. Recently, as a surface treatment of piston rings, attention has been paid to PVD treatment which exhibits wear resistance and scuffing resistance higher than that of hard Cr plating (JP-A-57-57868, JP-A-57-65837, and JP-A-57-65837). 58-35648, etc.). And
In Japanese Utility Model 1-222922 and Japanese Patent Publication 1-333658, hard Cr
A piston ring in which a hard film formed by PVD treatment is coated on a plated layer is described.
しかしながら、PVD処理ピストンリングを鋳鉄シリン
ダと共に用いた場合、ピストンリング側にはスカッフィ
ングは発生しないが、シリンダ側には油膜切れによりス
カッフィングの発生することが多く完全なものではな
い。However, when a PVD-treated piston ring is used with a cast iron cylinder, scuffing does not occur on the piston ring side, but scuffing often occurs due to oil film breakage on the cylinder side, and is not perfect.
本発明は以上の事情に鑑みてなされたもので、ピスト
ンリング側は勿論、シリンダ側にもスカッフィングが発
生せず、耐摩耗性、耐スカッフ性ともすぐれたピストン
リング及びその製造方法を提供することを目的とする。The present invention has been made in view of the above circumstances, and provides a piston ring that is excellent in wear resistance and scuff resistance without scuffing occurring not only on the piston ring side but also on the cylinder side, and a manufacturing method thereof. With the goal.
本発明の構成は、少なくとも外周摺動面がPVD処理に
よる硬質皮膜で被覆され、その下地は硬質Crめっき層で
あるピストンリングにおいて、前記外周摺動面に前記硬
質皮膜表面から前記下地硬質Crめっき層内へ達するピッ
トポーラスが面積比で５〜40％存在することを特徴とす
る。The configuration of the present invention, at least the outer peripheral sliding surface is covered with a hard film by PVD treatment, the base is a hard Cr plating layer in the piston ring, the outer peripheral sliding surface from the hard film surface to the base hard Cr plating It is characterized in that the pit porous reaching into the layer is present in an area ratio of 5 to 40%.
PVD処理による硬質皮膜がTiN、Ti（CX、NY）、CrN、C
r（CX、NY）から選ばれる１種又は２種の皮膜であるの
がよい。皮膜は上記物質の単層の皮膜である他、上記物
質の複層又は混合の皮膜であってもよい。これらの硬質
皮膜の厚さはピストンリングの使用条件にもよるが、１
〜30μｍとするのがよい。また、硬質Crめっきの厚さは
５〜200μｍとするのがよい。Hard coating by PVD treatment is TiN, Ti (C X , N Y ), CrN, C
It is preferable that the film is one or two kinds selected from r (C X , N Y ). The coating may be a single-layer coating of the above substances, or a multilayer coating or a mixture coating of the above substances. The thickness of these hard coatings depends on the usage conditions of the piston ring.
It is preferable that the thickness is about 30 μm. The thickness of the hard Cr plating is preferably 5 to 200 μm.
そして、外周摺動面の円周方向に１本又は複数本の条
痕を形成するのがよい。この条痕は、ピストンリング外
周摺動面の当り幅の1/7〜1/2の幅で、深さ0.03〜0.5mm
とするのがよい。Then, it is preferable to form one or a plurality of striations in the circumferential direction of the outer peripheral sliding surface. This striation has a width of 1/7 to 1/2 of the contact width of the outer peripheral sliding surface of the piston ring and a depth of 0.03 to 0.5 mm.
It is good to do.
前記ピットポーラスはPVD処理（温度は200〜250℃と
する）の終了時にピストンリングの温度を350〜450℃に
上げることにより形成できる。The pit porous can be formed by raising the temperature of the piston ring to 350 to 450 ° C. at the end of the PVD treatment (temperature is set to 200 to 250 ° C.).
外周摺動面が硬質Crめっき層上にPVD処理による硬質
皮膜を被覆しているので、耐摩耗性、耐スカッフ性にす
ぐれる。そして、本発明においては、外周摺動面にピッ
トポーラスが存在するため、ピットポーラスが油溜りと
なって、シリンダ側のスカッフィングも充分に防止でき
る。ここでピットポーラスの面積率は、５％未満では油
溜りとしての作用が不足し、40％を超えると耐摩耗性が
不充分になる。Since the outer peripheral sliding surface is coated with a hard film by PVD treatment on the hard Cr plating layer, it has excellent wear resistance and scuff resistance. Further, in the present invention, since the pit porous exists on the outer peripheral sliding surface, the pit porous becomes an oil reservoir, and scuffing on the cylinder side can be sufficiently prevented. Here, if the area ratio of the pit porous is less than 5%, the action as an oil sump is insufficient, and if it exceeds 40%, the wear resistance becomes insufficient.
そして、外周摺動面の円周方向に１本又は複数本の条
痕を備えれば、これが油溜りとして作用するので、特に
高熱負荷のピストンリングの場合好ましい。If one or a plurality of scratches are provided in the circumferential direction of the outer peripheral sliding surface, these will act as an oil sump, which is particularly preferable in the case of a high heat load piston ring.
本発明のPVD処理の下地硬質Crめっきは、極めて硬いP
VD皮膜の下地として必要な硬さを有し、しかも摺動面の
油溜りとして作用するピットポーラスを形成する際の起
点となる。即ち、低温でのPVD処理の終了時にピストン
リングの温度を上げることによって、硬質Crめっきにク
ラックが入り、PVD処理による硬質皮膜の表面から硬質C
rめっき層内に達するピットポーラスが形成される。そ
してその面積率は硬質Crめっきの条件や加熱温度によっ
てコントロールできる。この場合、最初から高温度でPV
D処理を施すと、第３図に示す如く、硬質Crめっき層２
のクラック部にもPVD処理による硬質皮膜３が形成さ
れ、ピストンリングの組み付け時リングが拡げられる際
に、硬質皮膜３に割れが発生し、欠け、剥離等を生じや
すいので好ましくない。The PVD-treated underlayer hard Cr plating of the present invention is an extremely hard P
It is the starting point when forming a pit porous that has the hardness necessary as the base of the VD film and also acts as an oil reservoir on the sliding surface. That is, by raising the temperature of the piston ring at the end of PVD treatment at low temperature, cracks are formed in the hard Cr plating, and the hard C from the surface of the hard coating by PVD treatment
r Pit porous that reaches into the plating layer is formed. The area ratio can be controlled by the hard Cr plating conditions and heating temperature. In this case, PV from the beginning at high temperature
When D treatment is applied, as shown in Fig. 3, the hard Cr plating layer 2
The hard coating 3 is formed in the cracked portion by PVD treatment, and when the ring is expanded at the time of assembling the piston ring, the hard coating 3 is liable to crack and chip or peel off, which is not preferable.
〔実施例１〕 ピストンリングの外周面に硬質Crめっきを施した後、
研磨加工してCrめっき厚さを50μｍに調整した。その
後、200℃でPVD処理して厚さ2.5μｍのTiN皮膜をCrめっ
き層上に被覆した。PVD処理の終了時にピストンリング
の温度を350℃に上げてCrめっき層にクラックを発生さ
せ、TiN皮膜の表面から硬質Crめっき層内に達するピッ
トポーラスを15％の面積率で得た。第１図は上記により
作製したピストンリングを示し、１はピストンリング母
材、２は硬質Crめっき層、３はTiN皮膜、４はピットポ
ーラスである。[Example 1] After plating the outer peripheral surface of the piston ring with hard Cr,
The Cr plating thickness was adjusted to 50 μm by polishing. Then, PVD treatment was performed at 200 ° C. to coat a 2.5 μm-thick TiN film on the Cr plating layer. At the end of the PVD treatment, the temperature of the piston ring was raised to 350 ° C to generate cracks in the Cr plating layer, and a pit porous reaching from the surface of the TiN film into the hard Cr plating layer was obtained with an area ratio of 15%. FIG. 1 shows the piston ring produced as described above, 1 is a piston ring base material, 2 is a hard Cr plating layer, 3 is a TiN film, and 4 is a pit porous.
〔実施例２〕 ピストンリングの外周面の母材表面に、円周方向に１
本の条痕を形成し、それから外周面に硬質Crめっきを施
し、研磨後実施例１と同様の製造工程によってピストン
リングを作製した。このピストンリングのＢ寸は1.2m
m、当り幅は1.0mmで、条痕の深さは0.15mm、幅は0.2mm
である。PVD処理皮膜はCrNとした。硬質Crめっきの厚さ
は50μｍ、CrN皮膜の厚さは15μｍ、ピットポーラスの
面積率は15％である。第２図は上記により作製したピス
トンリングを示し、１はピストンリング母材、２は硬質
Crめっき層、３はCrN皮膜、４はピットポーラス、５は
条痕である。[Embodiment 2] The outer peripheral surface of the piston ring has a circumferential surface of 1
After forming streaks on the book, the outer peripheral surface was plated with hard Cr, and after polishing, a piston ring was manufactured by the same manufacturing process as in Example 1. B dimension of this piston ring is 1.2m
m, contact width 1.0 mm, streak depth 0.15 mm, width 0.2 mm
Is. The PVD-treated film was CrN. The hard Cr plating has a thickness of 50 μm, the CrN film has a thickness of 15 μm, and the pit porous area ratio is 15%. FIG. 2 shows the piston ring manufactured as described above, 1 is a piston ring base material, and 2 is a hard material.
Cr plating layer, 3 is CrN film, 4 is pit porous, and 5 is streak.
〔実施例３〕 PVD処理による硬質皮膜が厚さ２μｍのTiN皮膜で、そ
の他は実施例２と同じピストンリングを、実施例２と同
様の工程で作製した。[Example 3] A hard ring formed by PVD was a TiN film having a thickness of 2 µm, and the same piston ring as in Example 2 except for the above was manufactured in the same process as in Example 2.
上記３種類のピストンリングと、Crめっきのみのピス
トンリング、及びCrめっき層上にクラックのないTiN−P
VD処理を施したピストンリングについて、二輪車用空冷
２サイクル100cc単気筒エンジンでエンジンテストを行
った。テスト条件を下記に示す。The above three types of piston rings, piston rings with only Cr plating, and TiN-P with no cracks on the Cr plating layer
An engine test was performed on a VD-treated piston ring with an air-cooled two-cycle 100cc single cylinder engine for motorcycles. The test conditions are shown below.
慣らし運転:3500rpm,全負荷,0.5時間後、4500rpm,全負
荷,0.5時間の計１時間 テスト運転:6500rpm,全負荷 評価方法：スカッフの発生しなかった場合、１時間毎に
ガソリンに対する潤滑油の混合比を表に示すように減少
して、スカッフ発生の混合比で評価した。Break-in operation: 3500 rpm, full load, 0.5 hours later, 4500 rpm, full load, 0.5 hours, total 1 hour Test operation: 6500 rpm, full load Evaluation method: If scuffing did not occur The mixing ratio was reduced as shown in the table and evaluated by the mixing ratio at which scuffing occurred.
表１、表２にテスト結果を示すが、本発明のピストン
リングは比較例に比べ優れた耐スカッフ性を示す。The test results are shown in Tables 1 and 2, and the piston ring of the present invention exhibits excellent scuff resistance as compared with the comparative example.
〔発明の効果〕 以上説明したように本発明のピストンリングによれ
ば、耐摩耗性、耐スカッフ性がすぐれ、かつ外周摺動面
のピットポーラスが油溜りとして作用するため摺動面の
保油性を高め油膜切れを抑制し、シリンダ側のスカッフ
ィングも防止できる。 [Advantages of the Invention] As described above, according to the piston ring of the present invention, the wear resistance and the scuff resistance are excellent, and the pit porous of the outer peripheral sliding surface acts as an oil reservoir, so that the oil retaining property of the sliding surface is maintained. To prevent oil film breakage and prevent scuffing on the cylinder side.
そして前記ピットポーラスはPVD処理（温度は200〜25
0℃とする）の終了時にピストンリングの温度を350〜45
0℃に上げることにより容易に形成できる。And the pit porous is PVD treated (temperature is 200-25
Temperature of the piston ring is 350-45 at the end of
It can be easily formed by raising the temperature to 0 ° C.
第１図及び第２図は本発明のピストンリングの一部分を
示す断面図、第３図は比較例としてのピストンリングの
一部分を示す断面図である。 １はピストンリング母材、２は硬質Crめっき層、３は硬
質皮膜、４はピットポーラス、５は条痕。1 and 2 are sectional views showing a part of a piston ring of the present invention, and FIG. 3 is a sectional view showing a part of a piston ring as a comparative example. 1 is a piston ring base material, 2 is a hard Cr plating layer, 3 is a hard coating, 4 is a pit porous, and 5 is a scratch.
Claims (4)
質皮膜で被覆され、その下地は硬質Crめっき層であるピ
ストンリングにおいて、前記外周摺動面に前記硬質皮膜
表面から前記下地硬質Crめっき層内へ達するピットポー
ラスが面積比で５〜40％存在することを特徴とするピス
トンリング。1. A piston ring in which at least an outer peripheral sliding surface is covered with a hard coating by PVD treatment, and a base thereof is a hard Cr plating layer, and in the outer peripheral sliding surface, from the hard coating surface to the base hard Cr plating layer. Piston ring with 5-40% area ratio of pit porous reaching inside.
NY）、CrN、Cr（CX、NY）から選ばれる１種又は２種の
皮膜であることを特徴とする請求項１記載のピストンリ
ング。2. A hard coating formed by PVD treatment comprises TiN, Ti (C X ,
The piston ring according to claim 1, which is a coating of one or two selected from N Y ), CrN, and Cr (C X , N Y ).
条痕を有することを特徴とする請求項１記載のピストン
リング。3. The piston ring according to claim 1, which has one or a plurality of striations in the circumferential direction of the outer peripheral sliding surface.
硬質Crめっきを施した後、少なくとも外周摺動面の硬質
Crめっき層上に200〜250℃でPVD処理により硬質皮膜を
被覆し、その後このピストンリングの温度を350〜450℃
に上げて、前記外周摺動面に前記硬質皮膜表面から前記
下地硬質Crめっき層内へ達するピットポーラスを面積比
で５〜40％形成することを特徴とするピストンリングの
製造方法。4. At least the outer peripheral sliding surface of the piston ring is plated with hard Cr, and at least the outer peripheral sliding surface is hard.
A PVD treatment is used to coat a hard coating on the Cr plating layer at 200 to 250 ° C, and then the temperature of this piston ring is set to 350 to 450 ° C.
The method for producing a piston ring is characterized in that the outer peripheral sliding surface is formed with a pit porous that extends from the surface of the hard coating to the inside of the hard Cr plating layer in an area ratio of 5 to 40%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2076233A JP2559284B2 (en) | 1990-03-26 | 1990-03-26 | Piston ring and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2076233A JP2559284B2 (en) | 1990-03-26 | 1990-03-26 | Piston ring and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03277870A JPH03277870A (en) | 1991-12-09 |
| JP2559284B2 true JP2559284B2 (en) | 1996-12-04 |
Family
ID=13599451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2076233A Expired - Fee Related JP2559284B2 (en) | 1990-03-26 | 1990-03-26 | Piston ring and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2559284B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101760263B1 (en) * | 2010-02-01 | 2017-07-21 | 페데랄-모굴 부르샤이트 게엠베하 | Oil control ring |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2687320B2 (en) * | 1990-04-17 | 1997-12-08 | 株式会社リケン | piston ring |
| JP2739722B2 (en) * | 1992-12-28 | 1998-04-15 | 株式会社リケン | piston ring |
| JP2011169421A (en) * | 2010-02-19 | 2011-09-01 | Isuzu Motors Ltd | Piston ring |
| JP6569178B2 (en) * | 2015-10-08 | 2019-09-04 | 地方独立行政法人大阪産業技術研究所 | Article having composite hard coating and method for producing the same |
-
1990
- 1990-03-26 JP JP2076233A patent/JP2559284B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101760263B1 (en) * | 2010-02-01 | 2017-07-21 | 페데랄-모굴 부르샤이트 게엠베하 | Oil control ring |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03277870A (en) | 1991-12-09 |
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