JP4980328B2 - Anti-corrosion rolling bearing - Google Patents

Anti-corrosion rolling bearing Download PDF

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JP4980328B2
JP4980328B2 JP2008280777A JP2008280777A JP4980328B2 JP 4980328 B2 JP4980328 B2 JP 4980328B2 JP 2008280777 A JP2008280777 A JP 2008280777A JP 2008280777 A JP2008280777 A JP 2008280777A JP 4980328 B2 JP4980328 B2 JP 4980328B2
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width
insulating layer
race
reference surface
rolling bearing
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JP2009052747A (en
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広亮 犬飼
秀司 伊藤
幸浩 片岡
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NTN Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/583—Details of specific parts of races
    • F16C33/586—Details of specific parts of races outside the space between the races, e.g. end faces or bore of inner ring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/62—Selection of substances
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2380/00—Electrical apparatus
    • F16C2380/26—Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators

Description

この発明は、汎用モータを始め、発電機用ジェネレータや鉄道車両の主電動機など、軸受内部を電流が流れる恐れのある装置に用いられる電食防止転がり軸受に関する。   The present invention relates to an electric corrosion-preventing rolling bearing used for a device in which a current may flow inside the bearing, such as a general-purpose motor, a generator for a generator, and a main motor of a railway vehicle.

従来、電食防止転がり軸受として、溶射加工より絶縁層を施したものが一般に製造されている。溶射加工により絶縁層を施した電食防止転がり軸受は、軌道輪の外周および幅面に渡る全面が金属層および絶縁層で覆われている（例えば特許文献１，特許文献２）。   Conventionally, as an electric corrosion prevention rolling bearing, a bearing provided with an insulating layer by thermal spraying is generally manufactured. The electric corrosion-preventing rolling bearing provided with an insulating layer by thermal spraying is covered with a metal layer and an insulating layer over the outer circumference and the width surface of the race (for example, Patent Document 1 and Patent Document 2).

特開２００２−４８１４５号公報JP 2002-48145 A 実開平２−４６１１９号公報Japanese Utility Model Publication No. 2-46119

絶縁層を施した構造の場合は、膜厚管理を行わないと最終仕上げ加工の際に幅面の膜厚相互差が大きくなり、絶縁性能が低下する可能性が考えられる。膜厚管理をする場合、深溝玉軸受の場合は、レース溝基準で、円筒ころ軸受の場合は鍔面基準で幅面の膜厚管理を行わなくてはならない。このため、煩雑な作業が必要で、測定にかなりの時間を要するうえ、直接にレース溝または鍔面を基準面として幅面機械加工ができないため、加工においてもかなりの時間と手間を要する。これらがコスト増の要因となる。   In the case of a structure provided with an insulating layer, if the film thickness is not managed, the film thickness difference between the width surfaces becomes large during the final finishing process, and there is a possibility that the insulating performance is lowered. When controlling the film thickness, it is necessary to manage the film thickness of the width surface on the basis of the race groove in the case of a deep groove ball bearing and on the surface side of the surface in the case of a cylindrical roller bearing. For this reason, a complicated operation is required, and a considerable time is required for the measurement. Further, since the width surface machining cannot be performed directly using the race groove or the flange surface as a reference surface, a considerable amount of time and labor are required for the processing. These increase costs.

この発明の目的は、上述のような最終仕上げ加工や膜厚管理を容易にかつ正確に行える電食防止転がり軸受を提供することである。   An object of the present invention is to provide an electrolytic corrosion-preventing rolling bearing capable of easily and accurately performing final finishing and film thickness management as described above.

この発明の電食防止転がり軸受は、内外の軌道輪のレース溝間に複数の転動体が介在し、少なくとも片方の軌道輪におけるハウジングまたは軸に嵌まり合う周面から両側の幅面に渡って絶縁層が設けられ、上記絶縁層を有する側の一方の幅面には、この一方の幅面の前記レース溝側の周縁に位置して上記絶縁層を未形成とした凹状で環状の段部が形成され、他方の幅面の前記レース溝側の周縁には、前記絶縁層を未形成とした面取り部が形成され、前記段部の軌道輪幅面への開口縁となる径および深さは、軌道輪のレース溝側の周面における前記面取り部の形成部分を除去した大きさに相当する寸法であり、前記段部の内面における軸方向を向く面を、幅面膜厚管理用の基準面としたことを特徴とする。
この構成によると、軌道輪の幅面に基準面を設けたため、幅面を機械加工によって所定の寸法に仕上げる際や、機械加工後の幅面の膜厚管理に、上記基準面を直接に利用することができる。そのため、軌道輪のレース溝や鍔面等を基準面に利用する場合のような煩雑な作業が廃止でき、機械加工後の膜厚管理を容易にかつ正確に行うことができる。 In the electric corrosion-preventing rolling bearing according to the present invention, a plurality of rolling elements are interposed between the race grooves of the inner and outer races, and insulation is performed from the circumferential surface fitted to the housing or shaft of at least one raceway to the width surfaces on both sides. A layer is provided, and one of the width surfaces on the side having the insulating layer is formed with a concave and annular stepped portion that is located on the periphery of the width surface of the one width surface on the race groove side and in which the insulating layer is not formed. Further, a chamfered portion in which the insulating layer is not formed is formed at the periphery of the other width surface on the race groove side, and the diameter and the depth of the opening edge to the race ring width surface of the stepped portion are a dimension equivalent to the size removal form part of the chamfered portion in the peripheral surface of the raceway side, to a surface facing the axial direction on the inner surface of the stepped portion, and the reference plane of the wide surfaces the film thickness for management It is characterized by.
According to this configuration, since the reference surface is provided on the width surface of the bearing ring, the reference surface can be directly used for finishing the width surface to a predetermined dimension by machining or for controlling the film thickness of the width surface after machining. it can. Therefore, troublesome work such as when the race groove or the ridge surface of the raceway is used as a reference surface can be eliminated, and film thickness management after machining can be performed easily and accurately.

上記基準面は、具体的には、軌道輪の幅面に形成された段部の内面であっても良い。このように段部で基準面を形成する場合、段部の加工によって基準面を精度良く得ることができる。   Specifically, the reference surface may be an inner surface of a step portion formed on the width surface of the race. In this way, when the reference surface is formed by the stepped portion, the reference surface can be obtained with high accuracy by processing the stepped portion.

上記基準面は、軌道輪の幅面における上記絶縁層を未形成とした素材露出面であっても良い。絶縁層を未形成とするだけで基準面が形成できるため、基準面の形成が容易である。   The reference surface may be a material exposed surface in which the insulating layer is not formed on the width surface of the race. Since the reference surface can be formed only by not forming the insulating layer, the reference surface can be easily formed.

上記基準面は、焼入れ鋼切削または研磨加工により形成された面であっても良い。これら焼入れ鋼切削または研磨加工によると、精度の良い加工が行え、基準面を高精度に形成することができる。   The reference surface may be a surface formed by quenching steel cutting or polishing. According to these hardened steel cutting or polishing, accurate processing can be performed, and the reference surface can be formed with high accuracy.

この発明の電食防止転がり軸受は、内外の軌道輪のレース溝間に複数の転動体が介在し、少なくとも片方の軌道輪におけるハウジングまたは軸に嵌まり合う周面から両側の幅面に渡って絶縁層が設けられ、上記絶縁層を有する側の一方の幅面には、この一方の幅面の前記レース溝側の周縁に位置して上記絶縁層を未形成とした凹状で環状の段部が形成され、他方の幅面の前記レース溝側の周縁には、前記絶縁層を未形成とした面取り部が形成され、前記段部の軌道輪幅面への開口縁となる径および深さは、軌道輪のレース溝側の周面における前記面取り部の形成部分を除去した大きさに相当する寸法であり、前記段部の内面における軸方向を向く面を、幅面膜厚管理用の基準面としたため、絶縁層の形成後の幅面機械加工や膜厚管理を容易にかつ正確に行うことができる。 In the electric corrosion-preventing rolling bearing according to the present invention, a plurality of rolling elements are interposed between the race grooves of the inner and outer races, and insulation is performed from the circumferential surface fitted to the housing or shaft of at least one raceway to the width surfaces on both sides. A layer is provided, and one of the width surfaces on the side having the insulating layer is formed with a concave and annular stepped portion that is located on the periphery of the width surface of the one width surface on the race groove side and in which the insulating layer is not formed. Further, a chamfered portion in which the insulating layer is not formed is formed at the periphery of the other width surface on the race groove side, and the diameter and the depth of the opening edge to the race ring width surface of the stepped portion are a dimension equivalent to the size removal form part of the chamfered portion in the peripheral surface of the raceway side, since the surface facing the axial direction on the inner surface of the stepped portion, and the reference plane of the wide surfaces the film thickness for management, Easy width surface machining and film thickness control after formation of insulation layer One can be accurately performed.

この発明の第１の実施形態を図１および図２と共に説明する。この電食防止転がり軸受１は、内側の軌道輪である内輪２と外側の軌道輪である外輪３の間に複数の転動体４を介在させ、外輪３のハウジング（図示せず）に嵌まり合う面である外周面３ａから両側の幅面３ｂ，３ｃに渡って絶縁層６を設け、外輪３の片方の幅面３ｂに基準面７を設けたものである。この電食防止転がり軸受１は深溝玉軸受であって、転動体４はボールである。内輪２および外輪３はレース溝１０，１１を有しており、両レース溝１０，１１の間に転動体４が介在している。各転動体４は保持器５の円周方向複数箇所に設けられた各ポケット内に転動自在に保持されている。   A first embodiment of the present invention will be described with reference to FIGS. The electric corrosion-preventing rolling bearing 1 has a plurality of rolling elements 4 interposed between an inner ring 2 that is an inner race and an outer ring 3 that is an outer race, and fits in a housing (not shown) of the outer race 3. The insulating layer 6 is provided from the outer peripheral surface 3 a that is a mating surface to the width surfaces 3 b and 3 c on both sides, and the reference surface 7 is provided on one width surface 3 b of the outer ring 3. The electric corrosion prevention rolling bearing 1 is a deep groove ball bearing, and the rolling element 4 is a ball. The inner ring 2 and the outer ring 3 have race grooves 10 and 11, and rolling elements 4 are interposed between the race grooves 10 and 11. Each rolling element 4 is rotatably held in each pocket provided at a plurality of locations in the circumferential direction of the cage 5.

外輪３の被覆層は、絶縁層６の１層又は多層からなる。基準面７は、幅面膜厚管理用の面であり、外輪３の幅面３ｂにおけるレース溝１１側の周縁、つまり内周縁部に環状に形成してある。また、この基準面７は、外輪３の幅面３ｂの内径縁に形成された環状の段部８の内面からなる。段部８の外径および深さは、外輪３の内径面における面取り３ｄの形成部分を除去した大きさに相当する寸法としてある。段部８は、外輪３に絶縁層６の溶射前に機械加工されたものであっても、溶射後に機械加工されたものであっても良い。この機械加工は、例えば焼入れ鋼切削または研磨加工とされる。外輪３、内輪２、および転動体４は、軸受鋼等の鋼材からなる。
The coating layer of the outer ring 3 is composed of one layer or multiple layers of the insulating layer 6. The reference surface 7 is a surface for managing the width surface film thickness, and is formed in an annular shape on the periphery of the width surface 3 b of the outer ring 3 on the race groove 11 side, that is, on the inner periphery. The reference surface 7 is composed of an inner surface of an annular step portion 8 formed at the inner diameter edge of the width surface 3 b of the outer ring 3. Outer diameter and depth of the stepped portion 8 is a phase equivalent to dimension the size is removed form part of the chamfer 3d in the inner diameter surface of the outer ring 3. The step portion 8 may be machined on the outer ring 3 before spraying the insulating layer 6 or may be machined after spraying. This machining is, for example, hardened steel cutting or polishing. The outer ring 3, the inner ring 2, and the rolling element 4 are made of a steel material such as bearing steel.

絶縁層６は、酸化アルミニウム（Ａｌ２ Ｏ３ ），酸化チタン（ＴｉＯ２ ）、または酸化クロム（Ｃｒ２ Ｏ３ ）などの金属酸化物、またはこれらの金属酸化物をベース材料とした複合金属酸化物などを、外輪３の素材表面に溶射加工した層である。この絶縁層６は、溶射後に後述のように機械加工される。外輪３の左右の幅面３ｂ，３ｃにおける絶縁層６の膜厚相互差は、５０μｍ以下に抑えることが望ましい。また、溶射加工前における基準面形成側の幅面３ｂと基準面７との平行度は、２５μｍ以下であることが望ましい。 The insulating layer 6 is made of a metal oxide such as aluminum oxide (Al 2 O 3 ), titanium oxide (TiO 2 ), or chromium oxide (Cr 2 O 3 ), or a composite metal oxide based on these metal oxides. This is a layer obtained by spraying an object or the like on the material surface of the outer ring 3. This insulating layer 6 is machined as described later after spraying. It is desirable that the difference in film thickness of the insulating layer 6 on the left and right width surfaces 3b, 3c of the outer ring 3 is suppressed to 50 μm or less. Further, it is desirable that the parallelism between the reference surface forming side width surface 3b and the reference surface 7 before spraying is 25 μm or less.

この構成によると、外輪３の幅面３ｂに基準面７を設けたため、幅面３ｂ，３ｃを機械加工によって所定の寸法に仕上げる際や、機械加工後の幅面３ｂ，３ｃの膜厚管理に、基準面７を直接に利用することができる。そのため、外輪３のレース溝１１等を基準面に利用する場合のような煩雑な作業が廃止でき、機械加工後の膜厚管理を容易にかつ正確に行うことができる。基準面７は段部８で形成されるため、精度良く得ることができる。また、焼入れ鋼切削または研磨加工で形成することにより、一層高精度に形成することができる。   According to this configuration, since the reference surface 7 is provided on the width surface 3b of the outer ring 3, the reference surface 7 is used when finishing the width surfaces 3b and 3c to a predetermined dimension by machining, or for controlling the film thickness of the width surfaces 3b and 3c after machining. 7 can be used directly. Therefore, troublesome work such as when the race groove 11 of the outer ring 3 is used as a reference surface can be eliminated, and film thickness management after machining can be easily and accurately performed. Since the reference surface 7 is formed by the step portion 8, it can be obtained with high accuracy. Moreover, it can form with higher precision by forming by hardening steel cutting or grinding | polishing process.

図２と共に、この実施形態の場合の幅面加工方法の一例を説明する。この加工方法では、次の（１）〜（４）の手順で加工する。
（１）．全製品について、溶射前に外輪３の基準面７と反基準面側の幅面３ｃの間の幅寸法Ａを測定する。
（２）．溶射後に、外輪３の基準面７と反基準面側の幅面３ｃの絶縁層表面との間の幅寸法Ｂを測定し、反基準面側の幅面３ｃにおける絶縁層６の取代を決定する。基準面７をバッキングプレート１５に当て、反基準面側の絶縁層６を機械加工する。この機械加工は研磨等とする。
（３）．目標寸法である幅仕上げ寸法と、外輪３の絶縁層６を含む全幅寸法Ｃとから、もう一方の取代を決定する。
（４）．加工済みの幅面３ｃを基準とし、幅仕上げ寸法の許容範囲内に入るように、逆側幅面３ｂを加工する。 An example of the width surface processing method in the case of this embodiment is demonstrated with FIG. In this processing method, processing is performed according to the following procedures (1) to (4).
(1). For all products, the width dimension A between the reference surface 7 of the outer ring 3 and the width surface 3c on the side opposite to the reference surface is measured before spraying.
(2). After the thermal spraying, a width dimension B between the reference surface 7 of the outer ring 3 and the insulating layer surface of the width surface 3c on the side opposite to the reference surface is measured to determine the allowance for the insulating layer 6 on the width surface 3c on the side opposite to the reference surface. The reference surface 7 is brought into contact with the backing plate 15, and the insulating layer 6 on the side opposite to the reference surface is machined. This machining is polishing or the like.
(3). The other machining allowance is determined from the width finishing dimension which is the target dimension and the full width dimension C including the insulating layer 6 of the outer ring 3.
(4). Using the processed width surface 3c as a reference, the reverse-side width surface 3b is processed so as to fall within an allowable range of the width finishing dimension.

理論計算式によれば、上記の方法によって絶縁層６の膜厚左右相互差を５０μｍに抑えることで、耐電圧の相互差を０．５ｋＶ以下に抑えられることになるなど、個々の絶縁性能のばらつきを小さくすることができる。また、取代を簡単に管理でき、工数の削減も期待できる。   According to the theoretical calculation formula, by suppressing the difference between the left and right thicknesses of the insulating layer 6 to 50 μm by the above method, the difference in withstand voltage can be suppressed to 0.5 kV or less. Variation can be reduced. In addition, it is possible to easily manage the machining allowance and reduce man-hours.

上記実施形態では、基準面７を片方だけに設けたが、参考提案例として図３に示すように外輪３両側の幅面３ｂ，３ｃに基準面７を設ける場合がある。この例においても、基準面７は、外輪３に形成した段部８の底面となる内面を基準面７としている。
また、基準面７は、参考提案例として図４に示すように外輪３の幅面３ｂ，３ｃにおける絶縁層６を未形成とした素材露出面とする場合がある。すなわち、外輪３の幅面３ｂ，３ｃの一部を溶射の施されていない面とし、その未溶射面を基準面７とする場合がある。 In the above embodiment, the reference surface 7 is provided on only one side, but as an example of a reference proposal, the reference surface 7 may be provided on the width surfaces 3b and 3c on both sides of the outer ring 3 as shown in FIG. Also in this example, the reference surface 7 uses the inner surface which becomes the bottom surface of the step portion 8 formed on the outer ring 3 as the reference surface 7.
The reference surface 7 may be a material exposed surface in which the insulating layer 6 is not formed on the width surfaces 3b and 3c of the outer ring 3, as shown in FIG. That is, in some cases, a part of the width surfaces 3 b and 3 c of the outer ring 3 is a surface that is not sprayed and the unsprayed surface is the reference surface 7.

なお、内輪２に絶縁層６を設ける場合は、内輪２に上記実施形態で示されるように基準面７を設ける。また、上記実施形態では深溝玉軸受に適用した場合につき説明したが、この発明は、円筒ころ軸受であっても良く、転がり軸受において、絶縁層６を設けたものであれば適用することができる。   In addition, when providing the insulating layer 6 in the inner ring | wheel 2, the reference surface 7 is provided in the inner ring | wheel 2 so that it may show in the said embodiment. Moreover, although the said embodiment demonstrated about the case where it applied to a deep groove ball bearing, this invention may be a cylindrical roller bearing and can be applied if the insulating layer 6 is provided in the rolling bearing. .

この発明の一実施形態にかかる電食防止転がり軸受の部分断面図である。It is a fragmentary sectional view of the electric corrosion prevention rolling bearing concerning one embodiment of this invention. その幅面加工方法の一例を示す説明図である。It is explanatory drawing which shows an example of the width surface processing method. この発明の参考提案例にかかる電食防止転がり軸受の部分断面図である。It is a fragmentary sectional view of the electric corrosion prevention rolling bearing concerning the example of a reference proposal of this invention. この発明のさらに他の参考提案例の部分断面図である。It is a fragmentary sectional view of the other reference proposal example of this invention.

符号の説明Explanation of symbols

１…電食防止転がり軸受
２…内輪（軌道輪）
３…外輪（軌道輪）
３ａ…周面
３ｂ，３ｃ…幅面
４…転動体
６…絶縁層
７…基準面 DESCRIPTION OF SYMBOLS 1 ... Electric corrosion prevention rolling bearing 2 ... Inner ring (Raceway ring)
3 ... Outer ring (Raceway)
3a ... peripheral surfaces 3b, 3c ... width surface 4 ... rolling element 6 ... insulating layer 7 ... reference plane

Claims (1)

内外の軌道輪のレース溝間に複数の転動体が介在し、少なくとも片方の軌道輪におけるハウジングまたは軸に嵌まり合う周面から両側の幅面に渡って絶縁層が設けられ、上記絶縁層を有する側の一方の幅面には、この一方の幅面の前記レース溝側の周縁に位置して上記絶縁層を未形成とした凹状で環状の段部が形成され、
他方の幅面の前記レース溝側の周縁には、前記絶縁層を未形成とした面取り部が形成され、
前記段部の軌道輪幅面への開口縁となる径および深さは、軌道輪のレース溝側の周面における前記面取り部の形成部分を除去した大きさに相当する寸法であり、
前記段部の内面における軸方向を向く面を、幅面膜厚管理用の基準面としたことを特徴とする電食防止転がり軸受。 A plurality of rolling elements are interposed between the race grooves of the inner and outer races, and an insulating layer is provided from the circumferential surface that fits the housing or shaft of at least one raceway to the width surfaces on both sides, and the insulating layer is provided. On one side of the width side, a concave and annular step is formed at the periphery of the side of the race groove on the side of the one side and the insulating layer is not formed.
A chamfered portion in which the insulating layer is not formed is formed at the periphery of the other width surface on the race groove side,
The diameter and depth of the opening edge of the bearing ring width surface of the stepped portion is dimensioned to equivalent to magnitude removing the formed portion of the chamfered portion in the peripheral surface of the raceway side of the bearing ring,
An electrolytic corrosion-preventing rolling bearing characterized in that a surface facing the axial direction on the inner surface of the stepped portion is used as a reference surface for width surface film thickness management.
JP2008280777A 2008-10-31 2008-10-31 Anti-corrosion rolling bearing Expired - Lifetime JP4980328B2 (en)

Priority Applications (1)

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Related Parent Applications (1)

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JP2002294436A Division JP2004132385A (en) 2002-10-08 2002-10-08 Electric erosion preventing rolling bearing

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JPH0743488Y2 (en) * 1987-09-01 1995-10-09 株式会社不二越 Anti-corrosion type rolling bearing
JPH065090B2 (en) * 1989-12-12 1994-01-19 日本精工株式会社 Rolling bearing and manufacturing method thereof
JPH06117441A (en) * 1992-09-30 1994-04-26 Ntn Corp Manufacture of rolling bearing for electrolytic corrosion protection
JPH07279972A (en) * 1994-04-14 1995-10-27 Ntn Corp Electric corrosion preventing rolling bearing
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