JPH0466A - Piston ring - Google Patents
Piston ringInfo
- Publication number
- JPH0466A JPH0466A JP9988590A JP9988590A JPH0466A JP H0466 A JPH0466 A JP H0466A JP 9988590 A JP9988590 A JP 9988590A JP 9988590 A JP9988590 A JP 9988590A JP H0466 A JPH0466 A JP H0466A
- Authority
- JP
- Japan
- Prior art keywords
- sprayed
- base
- thermal
- sprayed coating
- powder
- 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
- 239000011248 coating agent Substances 0.000 claims abstract description 42
- 238000000576 coating method Methods 0.000 claims abstract description 42
- 239000000843 powder Substances 0.000 claims abstract description 35
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 26
- 239000000956 alloy Substances 0.000 claims abstract description 26
- 239000002245 particle Substances 0.000 claims abstract description 15
- 229910001309 Ferromolybdenum Inorganic materials 0.000 claims abstract description 13
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 238000007751 thermal spraying Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 38
- 230000004927 fusion Effects 0.000 abstract 1
- 238000005507 spraying Methods 0.000 description 8
- 239000007921 spray Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000002344 surface layer Substances 0.000 description 5
- 229910001018 Cast iron Inorganic materials 0.000 description 3
- 229910001141 Ductile iron Inorganic materials 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910001203 Alloy 20 Inorganic materials 0.000 description 1
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 229910000604 Ferrochrome Inorganic materials 0.000 description 1
- 229910003310 Ni-Al Inorganic materials 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007730 finishing process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000007750 plasma spraying Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
Landscapes
- Pistons, Piston Rings, And Cylinders (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は溶射ピストンリングに関する。[Detailed description of the invention] [Industrial application field] The present invention relates to thermal spray piston rings.
ピストンリングの外周面に溶射皮膜を形成したものは知
られており、通常ＭＯ以外の溶射材を使用する場合は、
母材との密着性を良好にするために、表層部の溶射皮膜
の下に下地溶射皮膜を設ける。この場合、通常、ピスト
ンリングの外周面に浅い凹溝を全周にわたって形成し、
その溝内の全表面に下地溶射皮膜を設け、その溝内に表
層部の溶射材を溶着して形成する。Piston rings with a thermally sprayed coating formed on the outer circumferential surface are known, and when using a thermally sprayed material other than MO,
In order to improve adhesion to the base material, a base sprayed coating is provided below the surface sprayed coating. In this case, usually a shallow groove is formed on the outer circumferential surface of the piston ring,
A base thermal spray coating is provided on the entire surface within the groove, and the thermal spray material for the surface layer is welded into the groove.
そして、従来、例えばＮｉ−Ａｍ！下地溶射材が使用さ
れて、内燃機関用エンジンで一定の効果を出したが、高
負荷化する中では不充分で、ＮｉＡ１下地溶射皮膜が層
内剥離することがある。Conventionally, for example, Ni-Am! Underlying thermal spraying materials have been used to achieve certain effects in internal combustion engines, but they are insufficient under high loads, and the NiA1 underlying thermally sprayed coating may peel off within the layer.
また、Ｎｉ−Ａｌ下地溶射材は、５〜１０％ＡｌとＮｉ
であるため、硬度がＨｖ２００程度と低く耐摩耗性に乏
しい欠点があり、外周面に露出したＮｉ−Ａｌ１．下地
溶射皮膜は燃焼生成硬質粉によって容易に摩耗して、外
周面において母材と表層部の溶射皮膜との間に段付摩耗
を生し、その凹部が切欠作用となり耐剥離性が劣化し、
またこの凹部部分のエツジ部がシリンダ壁面を異常に加
速摩耗させることがある。In addition, the Ni-Al base thermal spray material contains 5 to 10% Al and Ni.
Therefore, the hardness is low at around Hv200 and the wear resistance is poor, and the Ni-Al1. The base thermal spray coating is easily abraded by the hard powder produced by combustion, causing stepped wear between the base material and the surface spray coating on the outer peripheral surface, and the recesses act as notches, deteriorating the peeling resistance.
Further, the edge portion of this recessed portion may cause abnormally accelerated wear on the cylinder wall surface.
本発明は以上の事情に鑑みてなされたもので、耐摩耗性
、耐焼付性にすぐれるとともに、耐剥離強度の高い下地
溶射皮膜を備えた溶射ピストンリングを提供することを
目的とする。The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a thermal sprayed piston ring having a base thermal sprayed coating with excellent wear resistance and seizure resistance, and high peel resistance.
本発明の構成は、外周面に形成した下地溶射皮膜上に表
層部の溶射皮膜を備えるピストンリングにおいて、前記
下地溶射皮膜が、ＭＯを６０重量％以上含み粒度が５μ
ｍ以上、４４μｍ未満のフェロモリブデン合金粉を溶射
したものか、あるいは前記フェロモリブデン合金粉と、
５〜５０重量％で粒度が４４μｍ以上、１２５μｍ未満
のＭ。The present invention provides a piston ring having a surface sprayed coating on a base sprayed coating formed on the outer peripheral surface, wherein the base sprayed coating contains 60% by weight or more of MO and has a particle size of 5 μm.
A thermally sprayed ferromolybdenum alloy powder with a diameter of 100 m or more and less than 44 μm, or the above ferromolybdenum alloy powder,
M having a particle size of 44 μm or more and less than 125 μm at 5 to 50% by weight.
粉、Ｎｉ自溶性合金粉のいずれか又は両方と、を混合溶
射したものからなり、その皮膜厚さが２０〜１００μｍ
であることを特徴とする。It is made by spraying a mixture of Ni powder, Ni self-fluxing alloy powder, or both, and the film thickness is 20 to 100 μm.
It is characterized by
従来使用されているＮ１−Ａ７！下地溶射皮膜の硬さは
ＨＶ２＋）０以下であり、耐摩耗材として使用される表
層部の溶射皮膜及び母材より硬度が低いため、運転中の
ツイスト応力がＮ１−Ａρ下地溶射皮膜に集中し、下地
溶射皮膜内で剥離を生しることがある。本発明は下地溶
射皮膜に耐摩耗性を付与するとともに、硬度を高くして
下地溶射皮膜への応力集中を防止する。この特性を付与
する材料は粉末粒度を微細にしないと、母材との結合力
が不安定になるため、５μｍ以上、４４μｍ未満の微細
粉を使用する。Conventionally used N1-A7! The hardness of the base thermal sprayed coating is HV2+)0 or less, which is lower than the surface sprayed coating used as a wear-resistant material and the base material, so the twist stress during operation is concentrated on the N1-Aρ base sprayed coating. Peeling may occur within the base thermal spray coating. The present invention not only imparts wear resistance to the base thermal sprayed coating, but also increases hardness to prevent stress concentration on the base thermal sprayed coating. If the powder particle size of the material imparting this property is not made fine, the bonding force with the base material will become unstable, so a fine powder of 5 μm or more and less than 44 μm is used.
溶射材の母材との結合力は溶射元素により大きな差があ
り、結合力の高い元素は周期率表の■、■族で、特に自
己結合力のある元素はＭＯ３Ｎｂ、Ｔａであり、その結
合力は、
Ｍ ｏ ： ５７０ ｋｇ／ｃＩＩ＋”Ｎｂ：５５０ｋ
ｇ／値２
Ｔ ａ ： ４７ Ｑ ｋｇ／ａｍ”
である。The bonding strength of thermal sprayed materials with the base material varies greatly depending on the sprayed element. Elements with high bonding strength are groups ■ and ■ of the periodic table, and elements with particularly strong self-bonding strength are MO3Nb and Ta. The force is Mo: 570 kg/cII+”Nb: 550k
g/value 2 Ta: 47 Q kg/am".
なお、これらの華元素では耐摩耗性に乏しい上に高価で
ある。In addition, these ferrous elements have poor wear resistance and are expensive.
これに対して、フェロモリブデン合金粉は、母材との密
着性が良好である上に、耐摩耗性があり、その上安価で
ある。なお、合金粉の硬さはＨｖ １１００程度である
。On the other hand, ferromolybdenum alloy powder has good adhesion to the base material, has wear resistance, and is inexpensive. Note that the hardness of the alloy powder is about Hv 1100.
フェロモリブデン合金粉中のＭｏ、Ｆｅ以外の不純物は
少ない方がよく、Ｍｏの含有量は６０重量％以上がよい
。なお、より好ましくは６５重量％以上である。そして
、母材との密着性等の点で粉末の粒度は５μｍ以上、４
４μｍ未満がよい。It is better to have less impurities other than Mo and Fe in the ferromolybdenum alloy powder, and the content of Mo is preferably 60% by weight or more. Note that the content is more preferably 65% by weight or more. In terms of adhesion to the base material, the particle size of the powder is 5 μm or more, 4 μm or more.
It is preferably less than 4 μm.
粉末の粒度が５μｍ未満では過溶融となり、溶射効率が
著しく低下し、４４μｍ以上では溶融不足により母材と
の密着性が劣化するおそれがある。If the particle size of the powder is less than 5 μm, over-melting will occur, resulting in a significant drop in thermal spraying efficiency, and if the particle size is 44 μm or more, there is a risk of poor adhesion to the base material due to insufficient melting.
なお、より好ましい範囲は１０〜２０μｍである。In addition, the more preferable range is 10-20 micrometers.
また、上記フェロモリブデン合金粉に、粒度が４４μｍ
以上、１２５μｍ未満の摺動特性及び母材との密着性を
妨げないＭＯ粉、Ｎｉ自溶性合金粉を混合溶射すれば、
下地溶射皮膜の粗さが大きくなって、表層部の溶射皮膜
との結合力が高まる。In addition, the above ferromolybdenum alloy powder has a particle size of 44 μm.
As mentioned above, if MO powder and Ni self-fusing alloy powder that do not interfere with the sliding properties of less than 125 μm and the adhesion with the base material are mixed and sprayed,
The roughness of the base sprayed coating increases, and the bonding strength with the surface sprayed coating increases.
下地溶射皮膜と表層部の溶射皮膜の結合はインターロッ
ク結合であり（第２図参照、１はピストンリング母材、
３は下地溶射皮膜、４は表層部の溶射皮膜）、そのため
結合力を上げるには下地溶射皮膜の表面粗さを粗くする
必要があり、それには下地溶射材の粒度を太き（するの
がよい。４４μｍ未満では粗さ出しの効果が望めず、１
２５μｍ以上では溶融不足になる可能性があり、気孔が
粗大になり、結合力が劣化する。なお、より好ましい範
囲は６３μｍ以上、１００μｍ未満である。The bond between the base sprayed coating and the surface sprayed coating is an interlock bond (see Figure 2, 1 is the piston ring base material,
3 is the base thermal sprayed coating, 4 is the surface sprayed coating), therefore, in order to increase the bonding strength, it is necessary to increase the surface roughness of the base thermal sprayed coating. Good. If it is less than 44 μm, the roughness effect cannot be expected, and 1
If it is 25 μm or more, there is a possibility that the melting will be insufficient, the pores will become coarse, and the bonding strength will deteriorate. Note that a more preferable range is 63 μm or more and less than 100 μm.
また、ＭＯ粉、Ｎ］自溶性合金粉の混合量は５重量％未
満では粗さ出しの効果が望めず、５０重量％を超えると
、硬さが低下し、層内強度が低下し、剥離を生じるおそ
れがある。なお、より好ましい範囲は１５〜４０重量％
である。Furthermore, if the mixing amount of MO powder, N] self-fusing alloy powder is less than 5% by weight, no roughness effect can be expected, and if it exceeds 50% by weight, hardness decreases, intralayer strength decreases, and peeling occurs. may occur. Note that the more preferable range is 15 to 40% by weight.
It is.
次に拡げテストを行った結果を説明する。球状黒鉛鋳鉄
よりなるリング径９０ｍｍφのピストンリングの外周面
の母材表面を、粗さ２０μｍＲＺにブラスト加工した後
、下地溶射材を単層でプラズマ溶射し、常法で仕上加工
した。そして、ビストンリングの内周の対称位置に配置
する一対のピンを反対方向に動かしてピストンリングを
拡げ、剥離又はクラック発生までの拡げ量を調べた。Next, the results of the expansion test will be explained. The base material surface of the outer circumferential surface of a piston ring made of spheroidal graphite cast iron and having a ring diameter of 90 mmφ was blasted to a roughness of 20 μm RZ, and then a single layer of base thermal spray material was plasma sprayed and finished using a conventional method. Then, a pair of pins arranged at symmetrical positions on the inner circumference of the piston ring were moved in opposite directions to expand the piston ring, and the amount of expansion until separation or cracking occurred was examined.
（１）下地溶射材
Ｆ ｅ −Ｍ ｏ ： ＪＩＳ Ｇ２３０７相当材ＭＯ
＝純度９９．７０％
Ｎｉ自溶性合金： ＪＩＳ ＭＳＦＮｉ−２相当材Ｆｅ
−Ｍｏの粉末粒度は５μｍ以上、４４μｍ未満。(1) Base thermal spray material F e -Mo: JIS G2307 equivalent material MO
= Purity 99.70% Ni self-fusing alloy: JIS MSFNi-2 equivalent material Fe
-Mo powder particle size is 5 μm or more and less than 44 μm.
Ｍｏ、Ｎｉ自溶性合金の粉末粒度は４４μｍ以上、１２
５μｍ未満。The powder particle size of Mo, Ni self-fusing alloy is 44 μm or more, 12
Less than 5 μm.
（２）表層部の溶射材 高Ｃｒ鋳鉄 ：５０重量％ Ｍｏ ：３０重量％ Ｎｉ自溶性合金：２０重量％ （ＪＩＳ ＭＳＦＮｉ−２相当材） 結果を表１に示す。(2) Thermal spray material on the surface layer High Cr cast iron: 50% by weight Mo: 30% by weight Ni self-fusing alloy: 20% by weight (JIS MSFNi-2 equivalent material) The results are shown in Table 1.
表１
上記のように、下地溶射皮膜が厚さ４０μｍのＮｉ−５
％ＡＩでは、下地溶射皮膜内で剥離する。Table 1 As mentioned above, the base thermal spray coating is Ni-5 with a thickness of 40 μm.
%AI, peeling occurs within the base thermal spray coating.
そして、Ｎｉ−５％Ａ１の下地溶射皮膜厚さを８０μｍ
にすれば剥離せず、クランクの発生にとどまるが、拡げ
量は３３ｍｍと小さい。これに対して、本発明のものは
、厚さ２０〜４０μｍで、いずれも単なるクラック発生
のみで剥離せず、拡げ量もＮ１−５％Ａ１のものに比べ
て大きいことがわかる。Then, the thickness of the Ni-5%A1 base thermal spray coating was 80 μm.
If this is done, no peeling will occur and only a crank will occur, but the amount of expansion will be as small as 33 mm. On the other hand, it can be seen that the samples of the present invention have a thickness of 20 to 40 μm, do not peel off due to mere cracking, and have a larger amount of expansion than the N1-5% A1 samples.
なお、下地溶射皮膜の厚さが２０μｍ未満であると、下
地溶射皮膜の粗さが不充分となり、１゜０μｍを越える
と、溶射皮膜全体に占める下地溶射皮膜の割合が多くな
って耐久性が劣るようになる。なお、より好ましい範囲
は３０〜８０μｍである。If the thickness of the base thermal sprayed coating is less than 20 μm, the roughness of the base sprayed coating will be insufficient, and if it exceeds 1°0 μm, the ratio of the base thermal sprayed coating to the entire thermal sprayed coating will increase, resulting in poor durability. become inferior. In addition, the more preferable range is 30-80 micrometers.
第１図はピストンリングの外周面に溶射皮膜を形成した
ものを示す。即ち、ピストンリング母材１が球状黒鉛鋳
鉄よりなるピストンリングの外周面に浅い凹溝２を全周
にわたって形成し、母材面を粗さ２０μｍＲＺにブラス
ト加工した後、その溝２内に下記に示す下地溶射材をプ
ラズマ溶射して、溝２内の全表面に下地溶射皮膜３を厚
さ６０μｍ設け、その後下記に示す表層部の溶射材を溝
２内にプラズマ溶射して、下地溶射皮膜３上に表層部の
溶射皮膜４を厚さ１５０μｍ設け、所定の仕上加工を施
して形成したものである、下地溶射材：
ＭＯを６０重量％以上含むフェロモリブデン合金粉のみ
、あるいはこれに５〜５０重量％でＭ。FIG. 1 shows a piston ring with a thermally sprayed coating formed on its outer circumferential surface. Specifically, a shallow concave groove 2 is formed on the outer peripheral surface of a piston ring whose base material 1 is made of spheroidal graphite cast iron, and after blasting the surface of the base material to a roughness of 20 μm RZ, the following is inserted into the groove 2. A base thermal sprayed coating 3 with a thickness of 60 μm is provided on the entire surface of the groove 2 by plasma spraying the base thermal sprayed material shown below, and then a surface sprayed material shown below is plasma sprayed into the groove 2 to form the base thermal sprayed coating 3. A thermal sprayed coating 4 on the surface layer with a thickness of 150 μm is formed on top of the thermal sprayed coating 4 and a predetermined finishing process is applied to the base thermal sprayed material: Only ferromolybdenum alloy powder containing 60% by weight or more of MO, or 5 to 50% MO in addition to the ferromolybdenum alloy powder. M in weight%.
粉、Ｎｉ自溶性合金粉のいずれか又は両方を混合したも
ので、フェロモリブデン合金粉の粒度は５μｍ以上、４
４μｍ未満、ＭＯ粉、Ｎｉ自溶性合金の粒度は４４μｍ
以上、１２５μｍ未満のもの。powder, Ni self-fusing alloy powder, or a mixture of both.The particle size of the ferromolybdenum alloy powder is 5 μm or more, 4 μm or more.
Less than 4μm, MO powder, Ni self-fusing alloy particle size is 44μm
or more, less than 125 μm.
表層部の溶射材：
高Ｃｒ鋳鉄 ５０重量％
Ｍｏ ３Ｑ重量％
Ｎｉ自溶性合金 ２０重量％
（ＪＩＳ ＭＳＦＮｉ−２相当材）
ピストンリング母材は上記では球状黒鉛鋳鉄を使用した
が、勿論これに限ることはなく１．他の鋳鉄あるいは鋼
を適宜使用すればよい。Sprayed materials for the surface layer: High Cr cast iron 50% by weight Mo 3Q% by weight Ni self-fusing alloy 20% by weight (JIS MSFNi-2 equivalent material) Spheroidal graphite cast iron was used as the piston ring base material above, but of course it is limited to this. Without a doubt 1. Other cast iron or steel may be used as appropriate.
また、表層部の溶射材としては、上記に限らず、この他
例えば下記に示すもの等を使用するのがよい。Further, the thermal spraying material for the surface layer portion is not limited to those mentioned above, but it is also preferable to use, for example, those shown below.
高Ｃフェロクロム合金 ７０重量％
Ｍｏ ９重量％Ｎｉ自溶性合金
２１重量％
（ＪＩＳ ＭＳＦＮｉ−２相当材）
〔発明の効果〕
以上説明したように本発明によれば、耐摩耗性、耐焼付
性にすぐれるとともに、耐剥離強度の高い下地溶射皮膜
を備えた溶射ピストンリングとなる。High C ferrochrome alloy 70% by weight Mo 9% by weight Ni self-fluxing alloy 21% by weight (JIS MSFNi-2 equivalent material) [Effects of the Invention] As explained above, according to the present invention, wear resistance and seizure resistance are improved. This results in a thermally sprayed piston ring with a base thermally sprayed coating that has excellent peel resistance and high peel resistance.
第１図は本発明の一実施例を示すピストンリングの一部
分の縦断面図、第２図はその要部拡大図である。
１はピストンリング母材、２は凹溝、３は下地溶射皮膜
、４は表層部の溶射皮膜。FIG. 1 is a longitudinal sectional view of a portion of a piston ring showing an embodiment of the present invention, and FIG. 2 is an enlarged view of the main part thereof. 1 is the piston ring base material, 2 is the groove, 3 is the base sprayed coating, and 4 is the surface sprayed coating.
Claims (2)
皮膜を備えるピストンリングにおいて、前記下地溶射皮
膜が、Ｍｏを６０重量％以上含み粒度が５μｍ以上、４
４μｍ未満のフェロモリブデン合金粉を溶射したもので
、その皮膜厚さが２０〜１００μｍであることを特徴と
するピストンリング。(1) In a piston ring having a surface sprayed coating on a base sprayed coating formed on the outer peripheral surface, the base sprayed coating contains 60% by weight or more of Mo and has a particle size of 5 μm or more;
A piston ring characterized in that it is thermally sprayed with ferromolybdenum alloy powder of less than 4 μm and has a coating thickness of 20 to 100 μm.
皮膜を備えるピストンリングにおいて、前記下地溶射皮
膜が、Ｍｏを６０重量％以上含み粒度が５μｍ以上、４
４μｍ未満のフェロモリブデン合金粉と、５〜５０重量
％で粒度が４４μｍ以上、１２５μｍ未満のＭｏ粉、Ｎ
ｉ自溶性合金粉のいずれか又は両方と、を混合溶射した
もので、その皮膜厚さが２０〜１００μｍであることを
特徴とするピストンリング。(2) In a piston ring having a surface sprayed coating on a base sprayed coating formed on the outer peripheral surface, the base sprayed coating contains 60% by weight or more of Mo and has a particle size of 5 μm or more;
Ferromolybdenum alloy powder of less than 4 μm, Mo powder with a particle size of 44 μm or more and less than 125 μm at 5 to 50% by weight, N
A piston ring characterized in that it is obtained by thermal spraying a mixture of either or both of the self-fusing alloy powders and has a coating thickness of 20 to 100 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9988590A JPH0466A (en) | 1990-04-16 | 1990-04-16 | Piston ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9988590A JPH0466A (en) | 1990-04-16 | 1990-04-16 | Piston ring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0466A true JPH0466A (en) | 1992-01-06 |
Family
ID=14259240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9988590A Pending JPH0466A (en) | 1990-04-16 | 1990-04-16 | Piston ring |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0466A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015125832A1 (en) * | 2014-02-19 | 2015-08-27 | 株式会社リケン | Piston ring |
-
1990
- 1990-04-16 JP JP9988590A patent/JPH0466A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015125832A1 (en) * | 2014-02-19 | 2015-08-27 | 株式会社リケン | Piston ring |
| JP5860571B1 (en) * | 2014-02-19 | 2016-02-16 | 株式会社リケン | piston ring |
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