JPS63293322A - Surface treatment method for bearing - Google Patents

Surface treatment method for bearing

Info

Publication number
JPS63293322A
JPS63293322A JP12640687A JP12640687A JPS63293322A JP S63293322 A JPS63293322 A JP S63293322A JP 12640687 A JP12640687 A JP 12640687A JP 12640687 A JP12640687 A JP 12640687A JP S63293322 A JPS63293322 A JP S63293322A
Authority
JP
Japan
Prior art keywords
organic
compound
oil
surface treatment
molybdenum
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
Application number
JP12640687A
Other languages
Japanese (ja)
Other versions
JPH0823371B2 (en
Inventor
Tasuku Sato
佐藤 佐
Kiyoshi Nakanishi
清 中西
Yasue Terada
寺田 康恵
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTN Corp
Original Assignee
NTN Toyo Bearing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NTN Toyo Bearing Co Ltd filed Critical NTN Toyo Bearing Co Ltd
Priority to JP12640687A priority Critical patent/JPH0823371B2/en
Publication of JPS63293322A publication Critical patent/JPS63293322A/en
Publication of JPH0823371B2 publication Critical patent/JPH0823371B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Lubricants (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

PURPOSE:To make it possible to form a thin and even lubricious membrane by carrying out the surface treatment in soaking a bearing in a solution mixing 0.3 to 3.0 wt% of an organic molybdenum compound, 0.1 to 1.0 wt% of an organic zinc compound, and remaining wt% of a mineral oil or a synthetic hydrocarbon oil at 170 to 220 deg.C. CONSTITUTION:The surface treatment of a bearing is carried out by soaking in a mixture solution which consists of 0.3 to 3.0 wt% of an organic molybdenum compound, 0.1 to 1.0 wt% of an organic zinc compound, with or without an amine-type oxidation-preventive agent, and the remaining wt% of a mineral oil or a synthetic bydrocarbon oil, and heated up to 170 to 220 deg.C. As the organic molybdenum compound, molybdenum dialkyldithiocarbonate, molybdenum diallyldithiocarbonate, or the like is available. And as the organic zinc compound, zinc dialkyldiphosphate, zinc diallyldiphosphate, or the like is available.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は軸受の表面処理方法に関するものである。[Detailed description of the invention] [Industrial application field] This invention relates to a bearing surface treatment method.

〔従来の技術〕[Conventional technology]

高温または裔真空度の条件下で使用されるすべり軸受、
転がり軸受および軌道輪、転動体(ボール)、保持器等
の軸受部品(以下これを一括して軸受と略記する)の潤
滑性付与のための表面処理には、液体もしくは半固体状
の潤滑油もしくはグリースなどは使用できないので、二
硫化モリブデン、グラファイトなどの固体潤滑剤が用い
られている。そしてこれら固体潤滑剤は塗布もしくは蒸
着(イオンブレーティング、スパッタリング)などの方
法によって皮膜に加工されるが、近年は薄くて均質な膜
が得られ、また付着力が大きいという理由から塗布法よ
りもスパッタリング法の方が特に愛用されている。しか
し、このようなスパッタリング法にも、球状物の処理が
困難であったり、高価な真空設備を必要とするなどの欠
点がある。
Plain bearings used under high temperature or low vacuum conditions,
Liquid or semi-solid lubricating oil is used for surface treatment to impart lubricity to rolling bearings and bearing parts such as bearing rings, rolling elements (balls), and cages (hereinafter referred to collectively as bearings). Alternatively, since grease cannot be used, solid lubricants such as molybdenum disulfide and graphite are used. These solid lubricants are processed into a film by methods such as coating or vapor deposition (ion blating, sputtering), but in recent years, coating methods have become more effective because they produce thin, homogeneous films and have greater adhesion. The sputtering method is particularly popular. However, such sputtering methods also have drawbacks, such as difficulty in processing spherical objects and the need for expensive vacuum equipment.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

このように、従来の技術においては、軸受特に球状のも
のに対しても、薄くて均質で付着力も大きい潤滑性皮膜
を、しかも安価に形成することは容易でないという問題
点があった。
As described above, the conventional technology has a problem in that it is not easy to form a thin, homogeneous, and highly adhesive lubricating film on bearings, especially on spherical bearings, and at a low cost.

〔問題点を解決するための手段〕[Means for solving problems]

上記の問題点を解決するために、この発明は有機モリブ
デン化合物0.3〜3.0重量%、有機亜鉛化合物0.
1〜1.0重量%さらにアミン系酸化防止剤を加えるか
または加えずして、鉱油もしくは合成炭化水素油残部か
らなりかつ170″C〜220℃に加熱された混合溶液
に浸漬して軸受の表面処理を行なうという手段を採用し
たものである。以下その詳細を述べる。
In order to solve the above problems, this invention contains 0.3 to 3.0% by weight of an organic molybdenum compound and 0.3 to 3.0% by weight of an organic zinc compound.
1 to 1.0% by weight, with or without the addition of further amine antioxidants, by immersing the bearing in a mixed solution consisting of mineral oil or the balance of synthetic hydrocarbon oil and heated to 170"C to 220C. This method employs a method of surface treatment.The details will be described below.

まず、この発明における有機モリブデン化合物としては
、1式で示されるモリブデンジアルキルジチオカーバメ
イトまたはモリブデンジアリールジチオカーバメイトの
ほか、■式で示されるモリブデンジアルキルジチオフォ
スフェートまたはモリブデンジアリールジチオフオスフ
ヱート、すなわち 〔式中Xは0またはS〕 〔式中Rは一級または二級のアルキル基またはアリール
基〕 で示される化合物を挙げることができる。このような有
機モリブデン化合物はそれぞれ単独または2種類以上を
混合したものであってもよい、そして、これら有機モリ
ブデン化合物の添加量を0.3〜3.0重量%とする理
由は0.3重量%未満の少量では期待する効果が現れに
くく、また3、0重量%を越える多量では皮膜が必要以
上に厚くなって剥離しやすくなったり経済的な不利を招
いたりして好ましくないからである。
[ In the formula, X is 0 or S] [In the formula, R is a primary or secondary alkyl group or an aryl group] Compounds represented by the following can be mentioned. These organic molybdenum compounds may be used alone or in combination of two or more types, and the reason why the amount of these organic molybdenum compounds added is 0.3 to 3.0% by weight is 0.3% by weight. This is because if the amount is less than 3.0% by weight, it is difficult to achieve the desired effect, and if the amount is more than 3.0% by weight, the film becomes thicker than necessary, making it easy to peel off or causing economic disadvantage, which is undesirable.

つぎに、この発明における有機亜鉛化合物としては、ジ
ンクジアルキルジチオフォスフェートまたはジンクジア
リールジチオフォスフェート、すなわち、 〔式中R′は一級または二級のアルキル基またはアリー
ル基〕 で示される化合物を挙げることができる。そしてこのよ
うな有機亜鉛化合物はそれぞれ単独または2種類以上の
混合物であってもよく、いずれにしても前記の有機モリ
ブデン化合物とともにきわめて有効な極圧添加剤である
が、添加量は多過ぎても効果は同じかまたは悪くなるた
め、0.1〜1.0重量%であることが好ましい。
Next, examples of the organozinc compound in the present invention include zinc dialkyldithiophosphate or zinc diaryldithiophosphate, that is, a compound represented by [wherein R' is a primary or secondary alkyl group or aryl group] Can be done. These organozinc compounds may be used alone or in a mixture of two or more, and in any case, together with the organomolybdenum compounds mentioned above, they are extremely effective extreme pressure additives, but if the amount added is too large, Since the effect is the same or worse, it is preferably 0.1 to 1.0% by weight.

さらに、この発明におけるアミン系酸化防止剤は、たと
えばフェニルαナフチルアミン、4.4′−ジオクチル
ジフェニルアミン、アルキル化ジフェニルアミン、N、
N’−ジフェニル−p−フェニレンジアミン、N−フェ
ニル−N′−シクロヘキシル−P−フェニレンジアミン
などの芳香族系アミンが望ましい、なぜならば、芳香族
アミン系酸化防止剤はほかの酸化防止剤たとえばアルキ
ルアミンなどに比べて、熱的に安定性がある点で好まし
いからである。そしてこのようなアミン系酸化防止剤の
添加量は1.0重量%以下であることが望ましい、なぜ
ならば1.0重量%を越える多量では添加剤の析出など
が起こる場合もあって好ましくないからである。
Furthermore, the amine antioxidants in this invention include, for example, phenyl α-naphthylamine, 4,4'-dioctyl diphenylamine, alkylated diphenylamine, N,
Aromatic amines such as N'-diphenyl-p-phenylenediamine and N-phenyl-N'-cyclohexyl-P-phenylenediamine are preferred, since aromatic amine antioxidants may be used in combination with other antioxidants such as alkyl This is because it is preferable in terms of thermal stability compared to amines and the like. It is desirable that the amount of such amine antioxidants added is 1.0% by weight or less, because if the amount exceeds 1.0% by weight, precipitation of the additive may occur, which is not desirable. It is.

また、この発明における鉱油もしくは合成炭化水素油は
後述する混合溶液の加熱温度170〜220℃よりも高
い沸点のものであることが望ましく、たとえばポリαオ
レフィン油などを例示することができる。なお、ジメチ
ルシリコーン油、ジメチルジフェニルシリコーン油など
のシリコーン油は均一な皮膜の形成が困難であるから好
ましくない。
Further, the mineral oil or synthetic hydrocarbon oil in this invention preferably has a boiling point higher than the heating temperature of the mixed solution (170 to 220°C, which will be described later), and examples include poly-α-olefin oil. Note that silicone oils such as dimethyl silicone oil and dimethyl diphenyl silicone oil are not preferred because it is difficult to form a uniform film.

以上の有機モリブデン化合物、有機亜鉛化合物、さらに
必要に応じてアミン系酸化防止剤、を鉱油もしくは合成
炭化水素油に溶解する方法は特に限定するものではない
が、得られた混合溶液に被処理物の軸受を浸漬する。好
ましい浸漬温度を170〜220℃とする理由は第1回
に示したように、170℃未満の低温では皮膜の形成が
悪く、170℃付近で急激に良くなり、また220℃を
越える高温では次第に低下して、温度を上昇させてもそ
の効果がないからである。また、浸漬時間は特に限定さ
れるものではないが、−Sに潤滑性皮膜の場合、0.5
〜0.8μ厚の皮膜が広く採用されることから、第2図
に示す結果からすれば2時間以上を一つの目安とすれば
よい、なお、この発明の方法を行なうには、たとえば被
処理物を入れた編製の回転ドラムを混合液内で回転させ
れぽよく、このようにすれば被処理物の表面を満遍なく
処理することが出来て、皮膜の厚さは均一になる。
The method of dissolving the above-mentioned organic molybdenum compound, organic zinc compound, and optionally an amine antioxidant in mineral oil or synthetic hydrocarbon oil is not particularly limited, but the method of dissolving the above-mentioned organic molybdenum compound, organic zinc compound, and optionally an amine antioxidant in mineral oil or synthetic hydrocarbon oil is not particularly limited. Immerse the bearings in the The reason why the preferred immersion temperature is 170 to 220°C is as shown in Part 1. At low temperatures below 170°C, film formation is poor, and at temperatures around 170°C, it rapidly improves, and at high temperatures above 220°C, it gradually deteriorates. This is because even if the temperature is lowered and the temperature is raised, there is no effect. In addition, the immersion time is not particularly limited, but in the case of a lubricating film on -S, 0.5
Since films with a thickness of ~0.8 μm are widely adopted, from the results shown in Figure 2, it is sufficient to use a time period of 2 hours or more as a guide. A knitted rotary drum filled with objects may be rotated within the mixed solution, and in this way the surface of the object to be treated can be evenly treated, resulting in a uniform coating thickness.

ここで、この発明で形成される皮膜はモリブデン、硫黄
、亜鉛などを含む複雑な組成、構造のものと推定される
。なお、鉱油、合成油などが支障を来たすときは皮膜を
溶剤で洗浄して使用すればよい。
Here, the film formed by the present invention is presumed to have a complex composition and structure containing molybdenum, sulfur, zinc, etc. If mineral oil, synthetic oil, etc. cause trouble, the film can be cleaned with a solvent before use.

〔実施例〕〔Example〕

実施例1: タービン油#140にモリブデンジアルキルジチオフォ
スフェート〔旭電化工業社製:商品名すクラループ30
0) 3重量%とジンクジアルキルジチオフォスフェー
ト〔日本ループリシール社製:商品名Lubrizol
 1095 ) 1重量%とを混合して処理液を作製し
た。そしてこの溶液を200±1℃に加熱して、これに
5UJ2製の1/4”ボールを浸漬し3.5時間静置し
た。このような処理を施したボールの表面には膜厚0.
3−の均一な黒色皮膜が形成されていた。そしてこの皮
膜の潤滑性を調べるために、つぎのような回転摩擦トル
クを測定した。
Example 1: Molybdenum dialkyl dithiophosphate was added to turbine oil #140 [manufactured by Asahi Denka Kogyo Co., Ltd., trade name: Kuralup 30]
0) 3% by weight and zinc dialkyldithiophosphate [manufactured by Nippon Lubrizil Co., Ltd.: trade name Lubrizol]
1095) and 1% by weight to prepare a treatment liquid. Then, this solution was heated to 200±1°C, and a 1/4" ball made of 5UJ2 was immersed in it and left to stand for 3.5 hours. The surface of the ball treated in this way had a film thickness of 0.
A uniform black film of 3- was formed. In order to examine the lubricity of this film, the following rotational friction torque was measured.

測定に使用した装置は第3図に示すように回転するレー
ス1に16個の試験ボール2を乗せ、荷重3を塔載し、
2個の軸受4および4′で支えられた軸5に取り付けら
れた平板6で前記試験ボール2を押え、この状態でレー
ス1を一定の回転速度で回転させ、そのときの回転摩擦
トルクをトルクメータ7で読み取るようになっている。
As shown in Fig. 3, the equipment used for the measurement was as follows: 16 test balls 2 were placed on a rotating race 1, and a load 3 was placed on the rotating race 1.
The test ball 2 is held down by a flat plate 6 attached to a shaft 5 supported by two bearings 4 and 4', and in this state, the race 1 is rotated at a constant rotational speed, and the rotational friction torque at that time is expressed as the torque. It is designed to be read by meter 7.

このような装置を用いて得た測定結果を第4図および第
5図に示した。なお第4図は真空度2 X 10− ”
 torrの比較的低真空下、荷重1.5kg f 、
 1600 rpmの条件のもとのトルクの経時変化を
、また第5図は真空度6X10−’と比較的高真空下で
荷重1.0kg r 、5000rp−としたときの回
転数とトルクとの関係を示したものであり、いずれも摩
擦トルク値は第3図の二つの軸受4および4′の分をも
含む合計値である。また、第4図には対照品として実施
例1の処理を施さない5IIJ2製の1/4″ボールを
用い、この結果をも記載したが、短時間でトルクは急上
昇し、本発明品は良好な潤滑性を示した。
Measurement results obtained using such an apparatus are shown in FIGS. 4 and 5. In addition, Fig. 4 shows the degree of vacuum 2 x 10-''
Under relatively low vacuum of torr, load 1.5 kg f,
Figure 5 shows the change in torque over time under the condition of 1600 rpm, and Figure 5 shows the relationship between rotational speed and torque when the load is 1.0 kg r and 5000 rpm under a relatively high vacuum of 6 x 10-'. In both cases, the friction torque value is a total value including that of the two bearings 4 and 4' shown in FIG. In addition, Fig. 4 also shows the results using a 1/4'' ball made of 5IIJ2 which was not subjected to the treatment of Example 1 as a control product, but the torque increased rapidly in a short time, and the product of the present invention was good. It showed excellent lubricity.

実施例2: 実施例1における処理液に酸化防止剤としてフェニルα
ナフチルアミン1重量%を添加した以外は実施例1と全
く同様の操作をして、5UJ2ボールの表面に皮膜を形
成した。得られた皮膜は、厚さ0.75−の均一な黒色
皮膜で、実施例1における皮膜よりもかなり厚いものが
得られた。またこのボールに対する回転摩擦トルクはQ
、5g−cm以下であった。
Example 2: Phenyl α was added as an antioxidant to the treatment liquid in Example 1.
A film was formed on the surface of a 5UJ2 ball by carrying out the same operation as in Example 1 except that 1% by weight of naphthylamine was added. The resulting film was a uniform black film with a thickness of 0.75 mm, which was considerably thicker than the film in Example 1. Also, the rotational friction torque for this ball is Q
, 5 g-cm or less.

比較例1: 実施例1における#140タービン油の代りにジメチル
シリコーン油(信越化学工業社製: KP96)を用い
た以外は実施例1と全く同一の操作を行なった。しかし
、ボール表面には皮膜が形成されず黒変しなかった。
Comparative Example 1: The same operation as in Example 1 was performed except that dimethyl silicone oil (manufactured by Shin-Etsu Chemical Co., Ltd.: KP96) was used instead of the #140 turbine oil in Example 1. However, no film was formed on the ball surface and it did not turn black.

比較例2: 実施例1におけるジンクジアルキルジチオフォスフェー
トを用いないこと以外は実施例1と全く同様の操作を行
なった。しかし得られたボールの表面に部分的な変色は
認められたものの全表面に均一な皮膜は形成されなかっ
た。
Comparative Example 2: The same operation as in Example 1 was performed except that the zinc dialkyl dithiophosphate in Example 1 was not used. However, although some discoloration was observed on the surface of the resulting ball, a uniform film was not formed over the entire surface.

比較例3:     。Comparative example 3:

従来用いられて来たスパッタリング法によって、実施例
1において用いたと同じ5IIJ2の1/4″ボ一ル表
面に、平均膜厚0.4−の二硫化モリブデンの黒色皮膜
を形成した。なお、スパッタリングの条件は4 W /
 cd、2時間(日型アネルバ社製:高周波スパッタリ
ング装置5TF−210使用)であって、得られたボー
ルについて、実施例1の場合と同様回転摩擦トルクを測
定した。測定結果を第4図に併記したが、第4図の低真
空度下においては本発明よりはやや劣る結果を示した。
By a conventional sputtering method, a black film of molybdenum disulfide with an average thickness of 0.4 mm was formed on the surface of the same 5IIJ2 1/4'' bowl used in Example 1. The condition is 4 W/
cd for 2 hours (using high frequency sputtering device 5TF-210 manufactured by Nikkei Anelva Co., Ltd.), and the rotational friction torque of the obtained ball was measured in the same manner as in Example 1. The measurement results are also shown in FIG. 4, and under the low degree of vacuum shown in FIG. 4, the results were slightly inferior to those of the present invention.

また第5図に相当する高真空下においては、本発明品(
実施例1)の耐久寿命が5.1X10’回転(102分
)であったのに対して、このスパッタリング法によるも
の(比較例3)の耐久寿命は9.35 XIO’回転(
187分)であった。
In addition, under high vacuum corresponding to Fig. 5, the product of the present invention (
The durability life of Example 1) was 5.1X10' rotations (102 minutes), while the durability life of the sputtering method (Comparative Example 3) was 9.35 XIO' rotations (102 minutes).
187 minutes).

〔効果〕〔effect〕

以上述べたように、この発明の軸受(すべり軸受、転が
り軸受およびこれら軸受の部品)の潤滑処理方法によれ
ば、たとえば蒸着装置のような特殊装置を必要とせず、
大量の処理が可能であり、潤滑処理費が安価であり、摩
擦係数が小さくて従来の二硫化モリブデンの蒸着皮膜と
少なくとも同程度のものを得ることが出来た。
As described above, according to the method for lubricating bearings (sliding bearings, rolling bearings, and parts of these bearings) of the present invention, there is no need for special equipment such as a vapor deposition equipment,
It is possible to process a large amount, the lubrication treatment cost is low, and the coefficient of friction is small, making it possible to obtain a film that is at least comparable to the conventional vapor-deposited film of molybdenum disulfide.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は混合溶液の液温と膜厚との関係を、また第2図
は液温175℃、200℃における浸漬時間と膜厚との
関係を示す図、また第3図は回転摩擦トルク測定装置を
模式的に示す図、第4図は回転摩擦トルクの経時変化、
第5図は回転摩擦トルクの寿命(総回転数)を示す図で
ある。。 1・・・・・・レース、2・・・・・・試験ボール、3
・・・・・・荷重、4.4′・・・・・・軸受、5・・
・・・・軸、6・・・・・・平板、7・・・・・・トル
クメータ。
Figure 1 shows the relationship between the liquid temperature of the mixed solution and film thickness, Figure 2 shows the relationship between immersion time and film thickness at liquid temperatures of 175°C and 200°C, and Figure 3 shows the rotational friction torque. A diagram schematically showing the measuring device, Figure 4 shows the change in rotational friction torque over time,
FIG. 5 is a diagram showing the life of rotational friction torque (total number of rotations). . 1... Race, 2... Test ball, 3
...Load, 4.4'...Bearing, 5...
... shaft, 6 ... flat plate, 7 ... torque meter.

Claims (2)

【特許請求の範囲】[Claims] (1)有機モリブデン化合物0.3〜3.0重量%、有
機亜鉛化合物0.1〜1.0重量%および鉱油もしくは
合成炭化水素油残部からなり、かつ170〜220℃に
加熱された混合溶液に浸漬することを特徴とする軸受の
表面処理方法。
(1) A mixed solution consisting of 0.3 to 3.0% by weight of an organic molybdenum compound, 0.1 to 1.0% by weight of an organic zinc compound, and the balance of mineral oil or synthetic hydrocarbon oil, and heated to 170 to 220°C. A method for surface treatment of bearings, characterized by immersing them in water.
(2)有機モリブデン化合物0.3〜3.0重量%、有
機亜鉛化合物0.1〜1.0重量%、アミン系酸化防止
剤および鉱油もしくは合成炭化水素油残部からなり、か
つ170〜220℃に加熱された混合溶液に浸漬するこ
とを特徴とする軸受の表面処理方法。
(2) Consisting of 0.3 to 3.0% by weight of an organic molybdenum compound, 0.1 to 1.0% by weight of an organic zinc compound, an amine antioxidant, and the balance of mineral oil or synthetic hydrocarbon oil, and at a temperature of 170 to 220°C. A method for surface treatment of bearings, characterized by immersion in a mixed solution heated to .
JP12640687A 1987-05-23 1987-05-23 Bearing surface treatment method Expired - Lifetime JPH0823371B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12640687A JPH0823371B2 (en) 1987-05-23 1987-05-23 Bearing surface treatment method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12640687A JPH0823371B2 (en) 1987-05-23 1987-05-23 Bearing surface treatment method

Publications (2)

Publication Number Publication Date
JPS63293322A true JPS63293322A (en) 1988-11-30
JPH0823371B2 JPH0823371B2 (en) 1996-03-06

Family

ID=14934367

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12640687A Expired - Lifetime JPH0823371B2 (en) 1987-05-23 1987-05-23 Bearing surface treatment method

Country Status (1)

Country Link
JP (1) JPH0823371B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2227031A (en) * 1988-12-01 1990-07-18 Nippon Seiko Kk Surface treated sliding or rolling contact element and rolling bearing
JPH02256920A (en) * 1988-12-01 1990-10-17 Nippon Seiko Kk Sliding or rolling members whereto surface treatment is performed and rolling bearing
US5252391A (en) * 1988-12-01 1993-10-12 Nippon Seiko Kabushiki Kaisha Surface treated sliding or rolling contact element and rolling bearing
US6612746B2 (en) 1996-07-30 2003-09-02 Nsk Ltd. Rolling apparatus having surface-treated rolling member

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2227031A (en) * 1988-12-01 1990-07-18 Nippon Seiko Kk Surface treated sliding or rolling contact element and rolling bearing
JPH02256920A (en) * 1988-12-01 1990-10-17 Nippon Seiko Kk Sliding or rolling members whereto surface treatment is performed and rolling bearing
GB2227031B (en) * 1988-12-01 1993-07-21 Nippon Seiko Kk Surface treated sliding or rolling contact element and rolling bearing
US5252391A (en) * 1988-12-01 1993-10-12 Nippon Seiko Kabushiki Kaisha Surface treated sliding or rolling contact element and rolling bearing
US6612746B2 (en) 1996-07-30 2003-09-02 Nsk Ltd. Rolling apparatus having surface-treated rolling member

Also Published As

Publication number Publication date
JPH0823371B2 (en) 1996-03-06

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