JPH0419471A - Piston ring - Google Patents
Piston ringInfo
- Publication number
- JPH0419471A JPH0419471A JP12463490A JP12463490A JPH0419471A JP H0419471 A JPH0419471 A JP H0419471A JP 12463490 A JP12463490 A JP 12463490A JP 12463490 A JP12463490 A JP 12463490A JP H0419471 A JPH0419471 A JP H0419471A
- Authority
- JP
- Japan
- Prior art keywords
- piston ring
- chrome plating
- crevices
- filling
- cr2o3
- 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
- 238000007747 plating Methods 0.000 claims abstract description 48
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000000919 ceramic Substances 0.000 claims abstract description 26
- 229910052804 chromium Inorganic materials 0.000 claims description 21
- 239000011651 chromium Substances 0.000 claims description 21
- 239000010410 layer Substances 0.000 claims description 13
- 239000002344 surface layer Substances 0.000 claims description 4
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 abstract description 34
- 238000011049 filling Methods 0.000 abstract description 23
- 239000011248 coating agent Substances 0.000 abstract description 9
- 238000000576 coating method Methods 0.000 abstract description 9
- 238000010438 heat treatment Methods 0.000 abstract description 9
- 238000011282 treatment Methods 0.000 abstract description 6
- 230000006835 compression Effects 0.000 abstract description 5
- 238000007906 compression Methods 0.000 abstract description 5
- 229910001018 Cast iron Inorganic materials 0.000 abstract description 4
- 230000005484 gravity Effects 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 abstract 2
- PXLIDIMHPNPGMH-UHFFFAOYSA-N sodium chromate Chemical compound [Na+].[Na+].[O-][Cr]([O-])(=O)=O PXLIDIMHPNPGMH-UHFFFAOYSA-N 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 8
- 239000007864 aqueous solution Substances 0.000 description 6
- 238000001035 drying Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 239000010687 lubricating oil Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000000866 electrolytic etching Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000000446 fuel Substances 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
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、ガソリンエンジン、ディーゼルエンジンなど
各種エンジン用として耐摩耗性、耐焼付性にすぐれてい
るピストンリングに関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a piston ring with excellent wear resistance and seizure resistance for use in various engines such as gasoline engines and diesel engines.
（従来の技術）
従来からガソリンエンジン、ディーゼルエンジンなど各
種エンジンに用いられているピストンリング、たとえば
、ピストンの上室と下室とを区画する２つ又はそれ以上
の圧縮リングと、王室におけるシリンダ内周面に余分に
付着した潤滑油を掻き落すオイルリングの３つ又はそれ
以上のリングは、エンジンのシリンダ内周面と摺接する
面に、クロムめっき、あるいは、モリブデン溶射などを
施して高速運動に対する耐摩耗性を付与することか行な
われている。一方、ピストンリンク基体に、セラミック
スを溶射コーティングして耐熱性や耐摩耗性を向上させ
ることも行なわれている。(Prior Art) Piston rings conventionally used in various engines such as gasoline engines and diesel engines, such as two or more compression rings that partition the upper and lower chambers of the piston, and The three or more oil rings that scrape off excess lubricating oil adhering to the circumferential surface are coated with chrome plating or molybdenum spraying on the surface that makes sliding contact with the inner circumferential surface of the engine cylinder to resist high-speed motion. Efforts have also been made to impart wear resistance. On the other hand, thermal spray coating of ceramics on the piston link base has also been carried out to improve heat resistance and wear resistance.
（発明か解決しようとする課題）
しかしながら、自動車、船舶その他各種エンジンなどの
高速化や高負荷化、燃料の低質化、とくに、エンジンの
高出力化と１８０（オーバーホール間隔）の長期化に伴
ない、ガス圧力、リングの慣性力、摩擦力、さらに、潤
滑油を掻くための力などをうけるピストンリングの掌耗
量が増加するという問題がある。又、セラミックスの溶
射コーティングは、ピストンリング基体への接着が物理
的結合であるために、コーティング皮膜と基体との結合
強度が比較的弱く、強振動下や熱サイクルの下での使用
に対し、剥離損傷やコーティング皮膜の均一な厚さ及び
平滑さなどの調整のため研摩仕上げを行なう必要があり
、コスト高となるなどといった問題がある。(Problem to be solved by the invention) However, as automobiles, ships, and various other engines become faster and more loaded, and the quality of fuel becomes lower, especially with the increase in the output of engines and the lengthening of the 180 (overhaul interval), There is a problem in that the amount of wear on the piston ring increases due to gas pressure, ring inertia, frictional force, and force for scraping lubricating oil. In addition, since the thermal spray coating of ceramics adheres to the piston ring base through physical bonding, the bonding strength between the coating film and the base is relatively weak, making it difficult to use under strong vibrations or thermal cycles. It is necessary to perform polishing to prevent peeling damage and to adjust the uniform thickness and smoothness of the coating film, resulting in problems such as high cost.
本発明は、前記問題を解決し、耐摩耗性、耐焼付性にす
ぐれているピストンリングを得ることを目的とするもの
て゛ある。The present invention aims to solve the above-mentioned problems and provide a piston ring with excellent wear resistance and seizure resistance.
（課題を解決するための手段）
本発明者は、前記問題を解決し、前記目的を達成するな
めには、ピストンリングの少なくとも摺動面に、特定条
件によりフレパスを具備した硬質クロムめっきを施し、
そのクレバスにＣｒ２Ｏ３セラミックスを充填させるか
、或いはＣｒ２Ｏ３セラミックスをクレバスに充填させ
つつ硬質クロムめっきを被覆することによって目的を達
し得ることを見出して本発明を完成するに至った。すな
わち、本発明は、ピストンリング基体、めつき膜厚が５
０〜１５０ＪＪ、ｍでありかつクレバス率が表層からピ
ストンリング基体との界面までの間のどの部分でも２０
〜５０％の範囲を維持するようにピストンリング基体の
少なくともエンジンシリンタ内面に摺接する面側にめっ
きして形成された硬質クロムめっき層、該硬質クロムめ
っき層のクレバスに充填するよう形成されたＣｒ２Ｏ３
セラミックスとからなるピストンリングであり、更に前
記クレバスに充填されたＣｒ２Ｏ３が硬質クロムめっき
表面をも被覆するよう構成されたものである。(Means for Solving the Problems) In order to solve the above-mentioned problems and achieve the above-mentioned objects, the present inventor has determined that at least the sliding surface of the piston ring is subjected to hard chrome plating with a flared surface under specific conditions. ,
The present invention was completed based on the discovery that the object can be achieved by filling the crevasses with Cr2O3 ceramics or by covering the crevasses with hard chromium plating while filling the crevasses with Cr2O3 ceramics. That is, in the present invention, the piston ring base has a plating film thickness of 5.
0 to 150 JJ, m, and the crevasse ratio is 20 at any part between the surface layer and the interface with the piston ring base.
A hard chromium plating layer formed by plating on at least the side of the piston ring base that makes sliding contact with the inner surface of the engine cylinder so as to maintain a range of 50%, and a hard chromium plating layer formed to fill in the crevasses of the hard chromium plating layer. Cr2O3
This piston ring is made of ceramics, and is further configured so that the Cr2O3 filled in the crevasse also covers the hard chromium plating surface.
本発明におけるピストンリング基体は、従来から使用さ
れている特殊鋳鉄、普通鋳鉄若くはＳＵＳなどで製作さ
れたものでよい。The piston ring base in the present invention may be made of conventionally used special cast iron, normal cast iron, SUS, or the like.
クレバスを有する硬質クロムめっきは、少なくともエン
ジン′シリンダの内面との摺接面に施せばよいのである
が、めつき膜厚が５０〜１５０μｍの範囲で、かつ、表
面の面積比からなるクレバス率が２０〜５０％であり、
このフレパス率が表層から少しづづ削って行ってめっき
皮膜と基体との界面位置までの間、現われる面において
常にこの範囲を維持しているようなめっき層を形成して
いることか必要であって、めっき膜厚が５０〜１５０μ
ｍの範囲内にあっても、クレバス率が２０〜５０％の範
囲外では、本発明の効果は得られないものであり、両者
あいまって本発明効果をもたらし得るものであって、め
っき膜厚５０〜１５０μｍとしたのは、５０μｍ未満で
は、本発明効果を長期間に亘って十分に発揮し得す、１
５０μｍを超えても効果により以上の差かなく、かえっ
て剥離などを生ずるようになるからであり、クレバス率
を２０〜５０％としたのは、２０％未満では、ｃ ｒ２
０３セラミックスを充填することによる耐摩耗性の向上
がみられず、５０％を超えると、めっき皮膜の小部分が
脱落を生じたり、次のｃ ｒ２ ｏ３セラミックス使用
量が増加する割合に比して耐摩耗性の向上が少ないこと
もあって不経済であるからである。Hard chrome plating with crevasses can be applied at least to the sliding surface with the inner surface of the engine's cylinder; 20-50%,
It is necessary to form a plating layer in which this flake pass rate always maintains this range on the surface that appears, from the surface layer being scraped little by little to the interface between the plating film and the substrate. , plating film thickness is 50~150μ
Even if the crevasses ratio is within the range of 20 to 50%, the effect of the present invention cannot be obtained. The reason why the diameter is 50 to 150 μm is that if the diameter is less than 50 μm, the effect of the present invention can be sufficiently exhibited over a long period of time.
This is because even if the crevasses exceed 50 μm, there will be no difference in effectiveness, and instead peeling will occur.
There is no improvement in wear resistance due to filling with 03 ceramics, and if it exceeds 50%, small parts of the plating film may fall off, and the amount of use of CR2 O3 ceramics increases compared to the rate of increase. This is because it is uneconomical because the improvement in wear resistance is small.
このような条件を満足するようなりレバスを有する硬質
クロムめっきは、一般に知られているチャンネル型、ピ
ンポイント型及びこれら型が併存するもので、その製造
方法はめっき時マスキングによるものやクロムめっき後
にエツチングするもの、めっき前の基体表面をあらして
形成されたものなどかあるが、本発明では前記のいずれ
かの方法、若くはそれらを組合せた方法でクロムめっき
を施行する二とによって得ることかできる。Hard chrome plating that satisfies these conditions and has a rebus is the generally known channel type, pinpoint type, and those in which these types coexist, and their manufacturing methods include masking during plating or after chrome plating. There are chromium platings that are formed by etching, and chrome plating that is formed by roughening the surface of the substrate before plating, but in the present invention, it is possible to obtain chromium plating by any of the above methods, or by a combination of these methods. can.
次に、硬質クロムめっきのクレバスへのＣｒ２Ｏ３セラ
ミックスの充填及び硬質クロムめっき表面のＣｒ２Ｏ３
セラミ・／クスの被覆は、クロム酸を水によって比重１
．６０〜１．７０に調整した８２ｃｒ０４濃水溶液、あ
るいは、このようなＨ２ＣｒＯ４濃水溶液と、微細なＣ
ｒ２Ｏ３セラミックス粒子とからなる充填溶液中に、前
記硬質クロムめっきを施したピストンリング基体を浸漬
し、フレハスに該充填溶液を充填すると共に、硬質クロ
ムめっき表面を被覆せしめ、乾燥後加熱処理することに
より、析出、蓄積されるＣｒ２Ｏ３セラミックスを形成
せしめるものであって、この充填、被覆−乾燥−加熱処
理は、２回置上反復して行なうことが好ましい。Next, filling the crevasses of the hard chrome plating with Cr2O3 ceramics and filling the hard chrome plating surface with Cr2O3
To coat ceramic/cus, chromic acid is mixed with water to a specific gravity of 1.
．． 82cr04 concentrated aqueous solution adjusted to 60 to 1.70, or such a H2CrO4 concentrated aqueous solution and fine C
By immersing the hard chromium-plated piston ring base in a filling solution consisting of r2O3 ceramic particles, filling the filler with the filling solution, and coating the hard chromium-plated surface, and heat-treating after drying. , to form Cr2O3 ceramics that are precipitated and accumulated, and it is preferable that the filling, coating-drying-heating treatment be repeated twice.
前記充填、被覆は、充填溶液中に浸漬して、１０” 〜
１ｏ−３ｒｏｒｒ程度の真空として５〜１０分間処理し
、乾燥は、４０〜６０℃に、２０〜３０分間、加熱処理
は、 ３８５〜４５０℃に９０〜１８０分間それぞれ行
なうことが好ましい。The filling and coating is performed by immersing it in a filling solution to form a 10"~
It is preferable to perform the treatment under a vacuum of about 10-3 rorr for 5 to 10 minutes, drying at 40 to 60°C for 20 to 30 minutes, and heating at 385 to 450°C for 90 to 180 minutes.
尚、硬質クロムめっきのクレバスへのＣｒ２Ｏ３セラミ
ックスの充填のみを実施する場合は充填溶液への浸漬の
度ごとに硬質クロムめっき表面の充填溶液を拭き取って
乾燥−加熱処理を行ったり、前記と同し充填、被覆−乾
燥−加熱処理を行った後被覆されたＣｒ２Ｏ３セラミッ
クス層を研削して取り除いて行う。In addition, when only filling crevasses of hard chromium plating with Cr2O3 ceramics, wipe off the filling solution from the surface of the hard chromium plating each time it is immersed in the filling solution and perform drying and heat treatment, or perform the same process as above. After filling, coating, drying, and heat treatment, the coated Cr2O3 ceramic layer is ground and removed.
このような各処理を行なって形成された本発明のピスト
ンリングは、Ｃｒ２Ｏ３セラミックスが化学変化を利用
して形成されたものであり、基体への密着性や、硬質ク
ロムめっき皮膜との密着性が非常によいものであるので
クレバスに充填することによって一層強く密着され、耐
摩耗性、耐焼付性を向上し得るものである。The piston ring of the present invention, which is formed through these treatments, is formed by utilizing chemical changes in Cr2O3 ceramics, and has excellent adhesion to the base and hard chromium plating film. Since it is a very good material, by filling it into crevasses, it can be made to adhere even more strongly and improve wear resistance and seizure resistance.
（実施例） 次に、本発明の実施例を述べる。(Example) Next, examples of the present invention will be described.
実施例１
ピストンリング基体として通常用いられている特殊鋳鉄
を使用して、外径１００ｍｍ、内径９２ｍｍ、厚さ２．
５ｍｍの圧縮リングのエンジンシリンダの内面に摺接す
る面に、厚さ１００μｍ、クレバス率３０％（表層側で
は３５％、基体との界面側では２５％であることを確認
した。）の硬質クロムめっきを浴温５５°Ｃ１電流密度
５０Ａ／ｄｍ２でめっきし、その後電流密度２０＝Ａ、
／ｄｍ２で電解エツチングする条件で施し、ついで、Ｃ
ｒＯ３を水に溶解して比重１．６５に調整したＨ２Ｃｒ
Ｏ４濃水溶液中に浸漬し、０．１ ｍｙｎｔｌＪの減圧
下において１０分間保持し、常圧に戻しさらに１０分間
静置してクレバス中を充填すると共に、前記硬質クロム
めっき表面を被覆し、ついて、６０℃で２０分間乾燥後
、徐々に昇温し、４００℃で９０分間加熱処理した。こ
の充填、被覆〜加熱処理を、さらに５回繰返して処理し
、Ｃｒ２Ｏ３セラミックスによりクレバスが十分充填さ
れ、かつその表面が被覆された硬質クロムめっき層が得
られた。Example 1 Special cast iron, which is commonly used as a piston ring base, was used to make a piston ring with an outer diameter of 100 mm, an inner diameter of 92 mm, and a thickness of 2.
Hard chrome plating with a thickness of 100 μm and a crevasses rate of 30% (35% on the surface layer side and 25% on the interface side with the base) is applied to the surface of the 5 mm compression ring that makes sliding contact with the inner surface of the engine cylinder. was plated at a bath temperature of 55°C, a current density of 50 A/dm2, and then a current density of 20 = A,
/dm2 under electrolytic etching conditions, and then C
H2Cr whose specific gravity was adjusted to 1.65 by dissolving rO3 in water
It is immersed in an O4 concentrated aqueous solution, held under a reduced pressure of 0.1 myntlJ for 10 minutes, returned to normal pressure, and left to stand for another 10 minutes to fill the crevasse and coat the hard chrome plating surface. After drying at 60°C for 20 minutes, the temperature was gradually raised and heat treatment was performed at 400°C for 90 minutes. This process of filling, coating and heat treatment was repeated five more times to obtain a hard chromium plating layer in which the crevasses were sufficiently filled with Cr2O3 ceramics and the surface thereof was coated.
実施例２
実施例１と同一材質で同一寸法の圧縮リングの摺擦面側
に、実施例１と同様の条件で硬質クロムめっきを施した
くクレバス率３０％）。Example 2 Hard chrome plating was applied to the sliding surface side of a compression ring made of the same material and having the same dimensions as Example 1 under the same conditions as Example 1 (crevasse ratio 30%).
ライで、粒径か０．０５〜０．５μｍの微細なＣＩ’２
０３セラミックス粒子を８２Ｃｒ０４濃水溶液に入れて
比重１．７０に調整し作成した充填溶液と、実施例１同
様の１２Ｃｒ０４濃水溶液を準備し、初めの２回の繰返
しは充填溶液で充填、被覆〜加熱処理をしく条件は実施
例１と同様）、次いで実施例１と同じ条件で）１２ｃｒ
０４濃水溶液で充填、被覆〜加熱処理を２回繰返し、ｃ
ｒ２ｏ３セラミックスがクレバスに充填された硬質クロ
ムめっき層を得た。Lie, fine CI'2 with a particle size of 0.05-0.5μm
A filling solution prepared by adding 03 ceramic particles to an 82Cr04 concentrated aqueous solution and adjusting the specific gravity to 1.70 and a 12Cr04 concentrated aqueous solution similar to Example 1 were prepared, and the first two repetitions were filled with the filling solution, coating and heating. The treatment was carried out under the same conditions as in Example 1), then under the same conditions as in Example 1).
Filling with 04 concentrated aqueous solution, coating and heating treatment were repeated twice, c
A hard chromium plating layer in which the crevasses were filled with r2o3 ceramics was obtained.
尚、実施例２では充填溶液への浸漬の際に硬質クロムめ
っき表面をＣｒ２Ｏ３セラミックスが被覆することにな
るが、その都度このｃｒ２ｏ３セラミックスを拭き取り
、従って硬質クロムめっき表面にはｃｒ２ｏ３セラミッ
クスがなくクレバスにのみ充填された状態とした。In Example 2, the hard chromium plating surface is coated with Cr2O3 ceramics when immersed in the filling solution, but this cr2O3 ceramics is wiped off each time, so there is no crevasses on the hard chromium plating surface. It was assumed that only the container was filled.
得られた本発明の実施例１と２によるピストンリング、
及び、同材質製で通常のクロムめっきだけを施したピス
トンリングについて、ビッカース硬度を測定した結果、
５点の測定平均値で、本発明ピストンリングでは、いず
れの実施例のものも８１０ｍＨＶであり、従来のピスト
ンリングでは、９５０ｍＨＶであった。又、この３種類
のビス１〜ンリンク゛をそれぞれとりつけたピストンを
ティーセルエンジンに装着して作動させ、合計５００時
間後ピストンリンク表面の摩耗や傷などの状態を観察し
た。Piston rings according to Examples 1 and 2 of the present invention obtained,
And, as a result of measuring the Vickers hardness of piston rings made of the same material and subjected to only normal chrome plating,
The average value measured at five points was 810 mHV for the piston rings of the present invention in all Examples, and 950 mHV for the conventional piston ring. In addition, the pistons to which these three types of screws and links were attached were installed in a Tee Cell engine and operated, and after a total of 500 hours, conditions such as wear and scratches on the surfaces of the piston links were observed.
その結果、本発明の両実施例に係るピストンリングには
、当り面が形成される以外回ら摩耗や傷は認められなか
った。これに対して、従来のピストンリングでは、摩耗
や傷かわすがなからも認められた。As a result, no wear or damage was observed in the piston rings according to both examples of the present invention except for the formation of the contact surface. In contrast, with conventional piston rings, wear and scratches were observed.
さらに、ＦＣ−２５のステータを用いピンオンディスク
型試験機を使用して、実施例１と同様にして硬質クロム
めっき、Ｃｒ２Ｏ３セラミックス充填、被覆処理を行な
った同材質所定寸法（摺動面５１１１ｎロ×４ケ所）の
試料ロータを製作し、速度８ｍ／秒、潤滑油ＣＤ級１０
Ｗ／３０を、８０℃、４００ｍ、Ｑ ／分で供給しなが
ら摺動面圧５０ｋｇｆ／ｃｉで２４時間試験したが本発
明の各層を形成した試料の摩耗量は、ロータで領００３
ｍｍであり、従来のクロムめっきだけを施したものは
、ロータで０．０１ｍｍであった。Furthermore, using a pin-on-disk type tester using an FC-25 stator, the same material was plated with hard chrome, filled with Cr2O3 ceramics, and coated in the same manner as in Example 1. A sample rotor was manufactured at 4 locations), the speed was 8 m/s, and the lubricating oil was CD class 10.
A test was conducted for 24 hours at a sliding surface pressure of 50 kgf/ci while supplying W/30 at 80°C, 400 m, and Q/min.
mm, and the conventional rotor with only chrome plating had a rotor thickness of 0.01 mm.
また、硬質クロムめっき層重層のものく試料■）、硬質
クロムめっき層上にＣｒ２Ｏ３セラミックス層を形成し
たもの（試料■）、及び本発明の実施例１に係る３０％
のクレバス率を有する硬質めっき層にｃｒ２ｏ３セラミ
ックスを充填して形成したもの（試料■）について上記
と同一条件で摩擦評価試験を行ない、その結果を第１図
に示す。In addition, a hard chromium plating layer multilayer sample (■), a Cr2O3 ceramic layer formed on a hard chromium plating layer (sample ■), and a 30% sample according to Example 1 of the present invention
A friction evaluation test was conducted under the same conditions as above for a hard plated layer having a crevasses ratio filled with cr2o3 ceramics (sample 2), and the results are shown in FIG.
第１図から分る通り本発明の実施例１によるものは、摺
動面圧３００眩ｆ／−を超えても優れた耐焼付性を有す
ることが実証された。As can be seen from FIG. 1, it was demonstrated that the product according to Example 1 of the present invention had excellent seizure resistance even when the sliding surface pressure exceeded 300 dazzling f/-.
尚、別途実施例２により得られたものについても摩擦評
価試験を行ったが試料■の曲線と略合致するため、ここ
では省略した。A friction evaluation test was also separately conducted on the sample obtained in Example 2, but it was omitted here because it substantially matched the curve of sample (2).
（発明の効果）
本発明は、ピストンリング基体上に、特定条件の硬質ク
ロムめっきを施し、さらにＣｒ２Ｏ３セラミ／クスを硬
質クロムめっきのクレバスに充填するよう形成するもの
であるから、耐摩耗性、耐焼付性にすぐれ、ピストンリ
ング自体はもちろん摺接するピストン面への損傷や摩耗
を防ぎ得るものであって大きな効果が認められる。(Effects of the Invention) In the present invention, hard chromium plating is applied under specific conditions on the piston ring base, and the crevasses of the hard chromium plating are filled with Cr2O3 ceramic/gloss. It has excellent seizure resistance and is highly effective in preventing damage and wear not only to the piston ring itself but also to the surface of the piston that it slides into contact with.
第１図は摩擦評価試験を示すグラフである。 FIG. 1 is a graph showing a friction evaluation test.
Claims (2)
μｍでありかつクレバス率が表層からピストンリング基
体との界面までの間のどの部分でも２０〜５０％の範囲
を維持するようにピストンリング基体の少なくともエン
ジンシリンダ内面に摺接する面側にめっきして形成され
た硬質クロムめっき層、該硬質クロムめっき層のクレバ
スに充填するよう形成されたＣｒ＿２Ｏ＿３セラミック
スとからなることを特徴とするピストンリング。(1) Piston ring base, plating film thickness is 50 to 150
μm and maintain a crevasses ratio of 20 to 50% at any part between the surface layer and the interface with the piston ring base by plating at least the side of the piston ring base that slides on the inner surface of the engine cylinder. A piston ring comprising a hard chromium plating layer and Cr_2O_3 ceramics formed to fill crevasses in the hard chromium plating layer.
ックスが硬質クロムめっき表面をも被覆する請求項１記
載のピストンリング。(2) The piston ring according to claim 1, wherein the Cr_2O_3 ceramics filled in the crevasse also covers the hard chromium plating surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12463490A JP2836910B2 (en) | 1990-05-15 | 1990-05-15 | piston ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12463490A JP2836910B2 (en) | 1990-05-15 | 1990-05-15 | piston ring |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0419471A true JPH0419471A (en) | 1992-01-23 |
| JP2836910B2 JP2836910B2 (en) | 1998-12-14 |
Family
ID=14890269
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12463490A Expired - Fee Related JP2836910B2 (en) | 1990-05-15 | 1990-05-15 | piston ring |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2836910B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5360634A (en) * | 1988-12-05 | 1994-11-01 | Adiabatics, Inc. | Composition and methods for densifying refractory oxide coatings |
-
1990
- 1990-05-15 JP JP12463490A patent/JP2836910B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5360634A (en) * | 1988-12-05 | 1994-11-01 | Adiabatics, Inc. | Composition and methods for densifying refractory oxide coatings |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2836910B2 (en) | 1998-12-14 |
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