JPH0379863A - Piston ring - Google Patents
Piston ringInfo
- Publication number
- JPH0379863A JPH0379863A JP21546789A JP21546789A JPH0379863A JP H0379863 A JPH0379863 A JP H0379863A JP 21546789 A JP21546789 A JP 21546789A JP 21546789 A JP21546789 A JP 21546789A JP H0379863 A JPH0379863 A JP H0379863A
- Authority
- JP
- Japan
- Prior art keywords
- plating layer
- piston ring
- layer
- chromium oxide
- cobalt
- 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.)
- Pending
Links
- 238000007747 plating Methods 0.000 claims abstract description 57
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000002131 composite material Substances 0.000 claims abstract description 23
- 239000002245 particle Substances 0.000 claims abstract description 18
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910000423 chromium oxide Inorganic materials 0.000 claims abstract description 17
- 230000002093 peripheral effect Effects 0.000 claims abstract description 7
- 229910052804 chromium Inorganic materials 0.000 claims description 17
- 239000011651 chromium Substances 0.000 claims description 17
- 238000002485 combustion reaction Methods 0.000 claims description 8
- 229910001096 P alloy Inorganic materials 0.000 claims description 6
- IGOJDKCIHXGPTI-UHFFFAOYSA-N [P].[Co].[Ni] Chemical compound [P].[Co].[Ni] IGOJDKCIHXGPTI-UHFFFAOYSA-N 0.000 claims description 6
- 229910045601 alloy Inorganic materials 0.000 abstract description 4
- 239000000956 alloy Substances 0.000 abstract description 4
- 238000005299 abrasion Methods 0.000 abstract 2
- 229910052698 phosphorus Inorganic materials 0.000 description 9
- 239000011574 phosphorus Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 6
- 239000003921 oil Substances 0.000 description 6
- 229910017052 cobalt Inorganic materials 0.000 description 5
- 239000010941 cobalt Substances 0.000 description 5
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 5
- 239000006185 dispersion Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 150000001869 cobalt compounds Chemical class 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 150000002816 nickel compounds Chemical class 0.000 description 2
- -1 phosphorus compound Chemical class 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- ISIJQEHRDSCQIU-UHFFFAOYSA-N tert-butyl 2,7-diazaspiro[4.5]decane-7-carboxylate Chemical compound C1N(C(=O)OC(C)(C)C)CCCC11CNCC1 ISIJQEHRDSCQIU-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Pistons, Piston Rings, And Cylinders (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、硬質クロムめっき層と複合分散めっき層との
二重構造を摺動面に有する内燃機関用ピストンリングに
係り、特にシリンダとの初期なじみ性が良く、かつ耐摩
耗性に優れたピストンリングに関する。Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a piston ring for an internal combustion engine that has a dual structure of a hard chromium plating layer and a composite dispersion plating layer on its sliding surface, and particularly relates to a piston ring for an internal combustion engine that has a double structure of a hard chrome plating layer and a composite dispersion plating layer. This invention relates to a piston ring that has good initial conformability and excellent wear resistance.
近年、エンジンの小型軽量化、高出力化などの高性能化
に伴い、ピストンリングに要求される条件はますます過
酷なものとなり、耐摩耗性はもちろんのこと、耐焼付性
、耐折損性などさまざまな観点から改良が加えられてい
る。In recent years, as engines have become smaller and lighter and have higher performance such as higher output, the conditions required for piston rings have become increasingly severe, and the conditions that are required of piston rings are not only wear resistance but also seizure resistance, breakage resistance, etc. Improvements have been made from various perspectives.
ところで、一般に組み立て直後のエンジンにおいては、
部品製作の精度上の制約からピストンリングとシリンダ
の大きさに誤差が生ずることは避けられず、両者間に隙
間が生じる。この隙間が存在したままの状態でエンジン
を運転すると、燃焼室の気密がやぶれ、クランク室への
ガスの吹き抜け（圧縮洩れ）が起こる。そしてこのガス
の吹き抜けはシリンダ内面を一様に覆っている潤滑油膜
を破るために、ピストンリングとシリンダ間に異常摩耗
を引き起こし、スカッフィングを発生させたりする。ま
た同時に、この隙間を通して潤滑オイルが燃焼室に入り
込み、オイル消費量も多くなる。By the way, in general, in an engine immediately after assembly,
Due to precision constraints in manufacturing parts, it is inevitable that errors will occur in the sizes of the piston ring and cylinder, and a gap will be created between them. If the engine is operated with this gap still present, the airtightness of the combustion chamber will be broken and gas will blow through (compression leak) into the crank chamber. This gas blow-through breaks the lubricating oil film that uniformly covers the inner surface of the cylinder, causing abnormal wear between the piston ring and the cylinder, resulting in scuffing. At the same time, lubricating oil enters the combustion chamber through this gap, increasing oil consumption.
従って、なじみ運転と呼ばれるエンジン組み立て直後の
初期運転では、ピストンリングとシリンダの共摺りを行
うことにより短期間のうちに両者の隙間を無くし、早く
両者をなじませる必要がある。Therefore, during the initial operation immediately after engine assembly, which is called break-in operation, it is necessary to eliminate the gap between the piston ring and the cylinder in a short period of time by rubbing together the piston ring and the cylinder, and to quickly get used to the two.
一般に耐摩耗性に優れたピストンリングは高い硬度の摺
動面を有することになるので、このなじみ運転の期間が
長くなる傾向がある。このため短期間にピストンリング
とシリンダをなじませる工夫としてピストンリングの外
周摺動面上に絡めっきなどの軟質皮膜層を設ける方法や
、リングの断面をテーパ上に加工したりする方法が採ら
れている。In general, piston rings with excellent wear resistance have a sliding surface with high hardness, so the break-in period tends to be long. For this reason, methods have been adopted to make the piston ring and cylinder fit together in a short period of time, such as providing a soft film layer such as interlocking plating on the outer circumferential sliding surface of the piston ring, or processing the cross section of the ring into a tapered shape. ing.
しかしながら、この錫めっきを施す方法は、高温、高負
荷の条件では錫めっき層が軟らかすぎるために始動初期
の段階で簡単に摩滅してしまい、なじみの効果がほとん
どなくなる。またリングの外周摺動面にテーパをつける
方法は、テーパの角度が燃焼室の気密性、及びシリンダ
内周面の保油性に影響を与えるという問題がある。However, in this method of applying tin plating, the tin plating layer is too soft under conditions of high temperature and high load, so it is easily worn away at the initial stage of startup, and the breaking-in effect is almost lost. Further, the method of tapering the outer circumferential sliding surface of the ring has a problem in that the angle of the taper affects the airtightness of the combustion chamber and the oil retention of the inner circumferential surface of the cylinder.
従って、本発明の目的は、高温、高負荷の条件でも初期
なじみ性が良く、スカッフィングも発生せず、比較的短
期間になじみ運転が終了し、しかも耐摩耗性の優れたピ
ストンリングを提供することである。Therefore, an object of the present invention is to provide a piston ring that has good initial break-in properties even under high temperature and high load conditions, does not cause scuffing, finishes break-in operation in a relatively short period of time, and has excellent wear resistance. That's true.
本発明者は、上記目的を達成すべく鋭意検討を重ねた結
果、耐摩耗性に優れた硬質クロムめっき層上に適度の硬
度を有する複合分散めっき層を形成することにより、良
好な初期なじみ性を有し、かつ耐摩耗性にも優れたピス
トンリングを提供できることを発見し、本発明を完成し
た。As a result of extensive studies to achieve the above object, the inventors of the present invention have found that by forming a composite dispersion plating layer with appropriate hardness on a hard chromium plating layer with excellent wear resistance, good initial conformability can be achieved. The present invention was completed based on the discovery that it is possible to provide a piston ring that has the following characteristics and also has excellent wear resistance.
すなわち、本発明の内燃機関用ピストンリングは、少な
くともその外周摺動面に、第１層として硬質クロムめっ
き層が、第２層として酸化クロム粒子分散ニッケル−コ
バルト−燐合金複合めっき層が順に形成されてなる二重
構造の層を有することを特徴とする。That is, in the piston ring for an internal combustion engine of the present invention, a hard chromium plating layer is formed as a first layer and a nickel-cobalt-phosphorus alloy composite plating layer in which chromium oxide particles are dispersed is formed as a second layer on at least the outer peripheral sliding surface thereof. It is characterized by having a double structure layer.
本発明の二重構造のピストンリング皮膜においては、上
層（第２層）の酸化クロム粒子分散複合めっき皮膜は、
下層（第１層）の硬質クロムめっき層より幾分軟らかい
材質であるので、エンジンの始動初期におけるシリンダ
とのなじみが良好であると同時に、急速に摩耗すること
がない。また下層（第１層）の硬質クロムめっき層は高
い硬度を有しているので、長期間（上層の摩耗後でも）
良好な耐摩耗性を維持することができる。In the double-structured piston ring coating of the present invention, the upper layer (second layer) of the chromium oxide particle dispersed composite plating coating is
Since the material is somewhat softer than the hard chrome plating layer of the lower layer (first layer), it fits well with the cylinder at the initial stage of engine startup, and at the same time does not wear out rapidly. In addition, the hard chrome plating layer of the lower layer (first layer) has high hardness, so it can last for a long time (even after the upper layer is worn out).
Good wear resistance can be maintained.
本発明を以下の実施例により添付図面を参照にして詳細
に説明する。The invention will be explained in detail by means of the following examples and with reference to the accompanying drawings.
第１図は、本発明の一実施例による内燃機関用ピストン
リングの断面図である。本実施例においては、ピストン
リング１の外周摺動面に、硬質クロムめっき層２と酸化
クロム粒子分散ニッケル−コバルト−燐合金複合めっき
層３とが二重構造となるように形成されている。FIG. 1 is a sectional view of a piston ring for an internal combustion engine according to an embodiment of the present invention. In this embodiment, a hard chromium plating layer 2 and a nickel-cobalt-phosphorus alloy composite plating layer 3 in which chromium oxide particles are dispersed are formed on the outer peripheral sliding surface of the piston ring 1 so as to have a double structure.
！１層の硬質クロムめっき層は、クロム酸を主体とした
めっき浴を用いて電気めっきによって得ることができる
。このようなめっき浴にはサージェント浴やフッ化物浴
の一種であるケイフッ化浴等を使用することができる。! One hard chromium plating layer can be obtained by electroplating using a plating bath mainly containing chromic acid. As such a plating bath, a Sargent bath, a silica fluoride bath, which is a type of fluoride bath, or the like can be used.
硬質クロムめっき層は硬度が高く、耐摩耗性に富む。従
って、硬質クロムめっき層の厚さは８０〜２００μｍで
あれば、よい。The hard chrome plating layer has high hardness and excellent wear resistance. Therefore, the thickness of the hard chromium plating layer should be 80 to 200 μm.
硬質クロムめっき層は硬度が高すぎるために初期なじみ
性に劣るので、この欠点を補うために、第２層として酸
化クロム粒子分散ニッケル−コバルト−リン合金複合め
っき皮膜を第１層上に形成する。Since the hard chromium plating layer has too high hardness and poor initial conformability, in order to compensate for this defect, a nickel-cobalt-phosphorus alloy composite plating film in which chromium oxide particles are dispersed is formed as a second layer on the first layer. .
複合皮膜中に含まれる燐は、皮膜の硬度を高め、耐摩耗
性、耐焼付性に対し優れた効果を示し、また基地の耐食
性も向上する。燐を含有するめっき皮膜の硬度は熱処理
により向上するので、熱処理温度を適切に選ぶことによ
り、良好な初期なじみ性を得るのに適した硬度（ＨＭＶ
６００〜８００）とすることができる。しかし燐の量が
１重量％以下では熱処理を行っても硬度がＨＭＶ６００
以上にならず、耐摩耗性、耐スカツフ性の効果は少ない
。また１０重量％を超えると硬度は増すが脆くなり、衝
撃強度も低下する。従って燐の量は１〜ｌＯ重量％とす
るのが良い。より好ましい燐の含有量は４〜７重量％で
ある。Phosphorus contained in the composite film increases the hardness of the film, exhibits excellent effects on wear resistance and seizure resistance, and also improves the corrosion resistance of the base. The hardness of a plating film containing phosphorus is improved by heat treatment, so by appropriately selecting the heat treatment temperature, the hardness (HMV) suitable for obtaining good initial conformability can be achieved.
600-800). However, if the amount of phosphorus is less than 1% by weight, the hardness will be HMV600 even after heat treatment.
Therefore, the effect of wear resistance and scuff resistance is small. Moreover, if it exceeds 10% by weight, the hardness will increase, but it will become brittle and the impact strength will also decrease. Therefore, the amount of phosphorus is preferably 1 to 10% by weight. A more preferable phosphorus content is 4 to 7% by weight.
コバルトはめっき合金基地の耐熱性、耐食性を改善する
とともに皮膜の圧壊疲労強度も向上させる。合金基地中
のコバルトの量は１０重量％以下では上記の効果が顕著
に得られず、また４０重量％を超えてもその効果に著し
い変化はないので、１０〜４０重量％とするのが良い。Cobalt improves the heat resistance and corrosion resistance of the plating alloy base, and also improves the crush fatigue strength of the coating. If the amount of cobalt in the alloy matrix is less than 10% by weight, the above effects cannot be obtained significantly, and even if it exceeds 40% by weight, there is no significant change in the effect, so it is preferable to set the amount of cobalt to 10 to 40% by weight. .
より好ましいコバルトの含有量は２０〜３０重量％であ
る。A more preferable cobalt content is 20 to 30% by weight.
酸化クロム粒子は燐とともに皮膜の耐摩耗性の向上に優
れた効果を示す。また酸化クロムは金属との濡れ性が低
く、また摩擦係数が小さいので、耐焼付性、耐スカツフ
性の改善にも寄与する。酸化クロムの量は５〜３０容量
％で、その平均粒径は０．５〜５μｍが良い。容量が５
％未満あるいは粒径が０．５μｍ未満では基地表面に占
める酸化クロムの面積が少なく、耐摩耗性、耐スカツフ
性の向上効果が少ない。また容量が３０％を超えるか粒
径が５μｍを超えると相手材の摩耗を大きくすることと
なり、さらに複合皮膜の強度も低下する。より好ましく
は、酸化クロム粒子の平均粒径は０．８〜１．２μｍで
、含有量は１５〜２５容量％である。Chromium oxide particles, together with phosphorus, have an excellent effect on improving the wear resistance of coatings. Furthermore, since chromium oxide has low wettability with metals and a small coefficient of friction, it also contributes to improving seizure resistance and scuffing resistance. The amount of chromium oxide is preferably 5 to 30% by volume, and the average particle size is preferably 0.5 to 5 μm. Capacity is 5
% or the particle size is less than 0.5 μm, the area of chromium oxide occupying the base surface is small, and the effect of improving wear resistance and scuff resistance is small. Moreover, if the capacity exceeds 30% or the particle size exceeds 5 μm, the wear of the mating material will increase, and the strength of the composite film will also decrease. More preferably, the average particle size of the chromium oxide particles is 0.8-1.2 μm, and the content is 15-25% by volume.
複合めっき皮膜の形成には、上記所望の組成となるよう
にニッケル化合物、コバルト化合物及び燐化合物を溶解
させためっき浴中に酸化クロム粒子を分散させたものを
使用する。ニッケル化合物及びコバルト化合物としては
硫酸塩、スルファミノ酸塩等を用い、燐化合物としては
燐酸、亜燐酸等を用いる。To form a composite plating film, chromium oxide particles are dispersed in a plating bath in which a nickel compound, a cobalt compound, and a phosphorus compound are dissolved so as to have the desired composition. As the nickel compound and cobalt compound, sulfate, sulfaminate, etc. are used, and as the phosphorus compound, phosphoric acid, phosphorous acid, etc. are used.
得られた複合めっき皮膜は水洗、乾燥後、必要に応じて
熱処理を行う。熱処理温度は２００〜３００℃程度で、
時間は３０〜６０分である。熱処理により複合皮膜の基
地が硬化し、良好な初期なじみ性を得るのに適した硬度
の複合皮膜が得られる。The obtained composite plating film is washed with water, dried, and then heat treated if necessary. The heat treatment temperature is about 200-300℃,
The time is 30-60 minutes. The base of the composite film is hardened by the heat treatment, and a composite film having a hardness suitable for obtaining good initial conformability is obtained.
本発明を以下の実施例によりさらに詳細に説明する。The present invention will be explained in further detail by the following examples.
実施例１
ピストンリングの外周摺動面に第１層として硬質クロム
めっき層を形成する第１の工程と、第２層として第１層
上に複合分散めっき層を形成する第２の工程と、得られ
た二重構造の層に熱処理を施こす第３の工程により、皮
膜を形成した。Example 1 A first step of forming a hard chromium plating layer as a first layer on the outer peripheral sliding surface of a piston ring, a second step of forming a composite dispersion plating layer on the first layer as a second layer, A film was formed by a third step of heat-treating the resulting double-structured layer.
まず第１の工程では、呼び径×幅×厚さが７７ｍｍ８１
．５ ｍｍＸ３．１ ｍｍの５ＫＤ−６１材のピストン
リングを複数本まとめて母材とし、表１に示す浴組成の
めっき浴を用い表２に示す条件で硬質クロムめっきを行
った。First, in the first step, the nominal diameter x width x thickness is 77mm81
．． A plurality of 5 mm x 3.1 mm 5KD-61 piston rings were used as a base material, and hard chromium plating was performed under the conditions shown in Table 2 using a plating bath having the bath composition shown in Table 1.
表 １
表 ２
この第１の工程により得られた硬質クロムめっき層の厚
さは１００μｍであった。Table 1 Table 2 The thickness of the hard chromium plating layer obtained by this first step was 100 μm.
第２の工程として、上記第１の工程によって得られた硬
質クロムめっき層を表面に有するピストンリングを表３
に示す組成を有するめっき浴中に浸漬し、めっき浴温度
６０℃、ｐＨ４、電流密度１０Ａ／ｄｍ”で５分間電流
を流して、電気めっきを行った。As a second step, a piston ring having a hard chromium plating layer on the surface obtained in the first step was prepared as shown in Table 3.
Electroplating was performed by immersing the sample in a plating bath having the composition shown below, and applying current at a plating bath temperature of 60° C., pH 4, and current density of 10 A/dm for 5 minutes.
表 ３
この第２工程により得られた第二層の複合めっき皮膜の
厚さは７μｍであり、その組成はコバルトが３０重量％
、燐が６．５重量％で、酸化クロム粒子は２０容積％で
あった。Table 3 The thickness of the second layer composite plating film obtained by this second step is 7 μm, and its composition is 30% by weight of cobalt.
, 6.5% by weight of phosphorus and 20% by volume of chromium oxide particles.
次に第３工程として、得られた二重構造の皮膜に２５０
℃で１時間の熱処理を施し、皮膜を硬化させた。このと
きの硬度は、第１層である硬質クロムめっき層はマイク
ロビッカースで９８０であり、第２層の複合めっき皮膜
層はマイクロビッカースで７５０であった。Next, as the third step, the obtained double-structured film is coated with 250
The film was cured by heat treatment at ℃ for 1 hour. The hardness at this time was 980 micro Vickers for the hard chromium plating layer, which is the first layer, and 750 micro Vickers for the second composite plating layer.
実機試験
４サイクル水冷４気筒１３００ ｃｃエンジン用の鋳鉄
（ＦＣ−２５）製エンジンシリンダに、上記ピストンリ
ングを組み込み、７５００ｒｐｍ全負荷で１００時間の
ベンチテストを行い、オイル消費量を測定した。Actual Machine Test The above piston ring was assembled into a cast iron (FC-25) engine cylinder for a 4-stroke, water-cooled, 4-cylinder 1300 cc engine, and a bench test was conducted at 7500 rpm and full load for 100 hours to measure oil consumption.
比較例１
また比較のため、ピストンリングの外周摺動面に硬質ク
ロムめっき層のみを形成したピストンリングを用いて実
施例１と同様に実機試験を行い、オイル消費量を測定し
た。Comparative Example 1 For comparison, an actual machine test was conducted in the same manner as in Example 1 using a piston ring in which only a hard chromium plating layer was formed on the outer peripheral sliding surface of the piston ring, and the oil consumption was measured.
試験結果を第２図に示す。The test results are shown in Figure 2.
第２図から明らかなように本発明のピストンリングは、
硬質クロムめっき層のみを摺動面に有するピストンリン
グに比べて、初期の時点からオイルの消費量が少なくな
っていることがわかる。これはピストンリングとシリン
ダとの隙間が短時間で消失していくため、すなわち初期
なじみ性が良いためである。As is clear from FIG. 2, the piston ring of the present invention is
It can be seen that oil consumption is lower from the initial stage compared to piston rings that have only a hard chrome plating layer on the sliding surface. This is because the gap between the piston ring and the cylinder disappears in a short time, that is, the initial conformability is good.
また実施例では、スカッフィングも全く認められなかっ
た。Further, in the examples, no scuffing was observed at all.
以上詳述した通り、硬質クロムめっき層と酸化クロム粒
子分散ニッケル−コバルト−燐合金複合めっき層とを外
周摺動面に有する本発明のピストンリングは、複合分散
めっき皮膜により初期なじみ性、耐スカツフ性に優れ、
また硬質クロムめっき層により長期耐摩耗性に優れてい
る。As detailed above, the piston ring of the present invention, which has a hard chromium plating layer and a nickel-cobalt-phosphorus alloy composite plating layer in which chromium oxide particles are dispersed, on the outer circumferential sliding surface, has excellent initial conformability and scuff resistance due to the composite dispersion plating film. excellent in sex,
Also, the hard chrome plating layer provides excellent long-term wear resistance.
第１図は本発明の一実施例によるピストンリングの断面
図であり、
第２図は実施例１及び比較例１のピストンリングにおい
て試験時間とオイル消費量との関係を示すグラフである
。
ｌ・・・ピストンリング母材
２・・・硬質クロムめっき層
３・・・酸化クロム粒子分散ニッケル−コバルト−燐合
金複合めっき皮膜FIG. 1 is a sectional view of a piston ring according to an example of the present invention, and FIG. 2 is a graph showing the relationship between test time and oil consumption in piston rings of Example 1 and Comparative Example 1. l...Piston ring base material 2...Hard chromium plating layer 3...Chromium oxide particle dispersed nickel-cobalt-phosphorus alloy composite plating film
Claims (1)
、前記硬質クロムめっき層の上に形成された酸化クロム
粒子分散ニッケル−コバルト−燐合金複合めっき層とか
らなる二重構造の層を有することを特徴とする内燃機関
用ピストンリング。At least on its outer peripheral sliding surface, it has a double structure layer consisting of a hard chromium plating layer and a chromium oxide particle dispersed nickel-cobalt-phosphorus alloy composite plating layer formed on the hard chromium plating layer. Piston rings for internal combustion engines with special features.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21546789A JPH0379863A (en) | 1989-08-22 | 1989-08-22 | Piston ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21546789A JPH0379863A (en) | 1989-08-22 | 1989-08-22 | Piston ring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0379863A true JPH0379863A (en) | 1991-04-04 |
Family
ID=16672862
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21546789A Pending JPH0379863A (en) | 1989-08-22 | 1989-08-22 | Piston ring |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0379863A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03113174A (en) * | 1989-09-27 | 1991-05-14 | Usui Internatl Ind Co Ltd | Piston ring |
-
1989
- 1989-08-22 JP JP21546789A patent/JPH0379863A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03113174A (en) * | 1989-09-27 | 1991-05-14 | Usui Internatl Ind Co Ltd | Piston ring |
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