JP2013199954A - Insulation rolling bearing for electrolytic corrosion prevention - Google Patents

Insulation rolling bearing for electrolytic corrosion prevention Download PDF

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JP2013199954A
JP2013199954A JP2012067221A JP2012067221A JP2013199954A JP 2013199954 A JP2013199954 A JP 2013199954A JP 2012067221 A JP2012067221 A JP 2012067221A JP 2012067221 A JP2012067221 A JP 2012067221A JP 2013199954 A JP2013199954 A JP 2013199954A
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Prior art keywords
insulating layer
peripheral surface
insulating
layer
raceway
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JP2012067221A
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Japanese (ja)
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Kazuyuki Fuchimoto
和幸 淵本
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NSK Ltd
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NSK Ltd
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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
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/24—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for radial load mainly
    • F16C19/26—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for radial load mainly with a single row of rollers
    • 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

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Support Of The Bearing (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

PROBLEM TO BE SOLVED: To actualize a structure which can attain the prevention of a creep of an outer race 3 which is an insulation race and the prevention of the damage of an insulation layer 8b formed of a synthetic resin coating the outer circumferential surface of the outer race 3 and both side surfaces of an axial direction.SOLUTION: A rubber layer 11 is provided outside an insulating layer 8b in a state of coating the whole of the insulating layer 8b. By adopting such a constitution, it becomes possible to make the inner circumferential surface of a housing and the outer circumferential surface of the rubber layer 11 frictionally engaged with each other strongly in a usage state, and to protect the insulation layer 8b by the rubber layer 11 against a shock load acting from the outside.

Description

この発明は、汎用或いは鉄道車両用の電動モータの回転軸、発電機或いはＣＴスキャナ等の医療用機器の回転軸の様に、電流が流れる可能性がある回転支持部に組み込む電食防止用絶縁転がり軸受の改良に関する。   This invention is an electric corrosion prevention insulation incorporated in a rotation support portion where current may flow, such as a rotation shaft of an electric motor for a general purpose or railway vehicle, a rotation shaft of a medical device such as a generator or a CT scanner. It relates to the improvement of rolling bearings.

電動モータや発電機等、各種電気機器等の回転軸を支承する為の転がり軸受の場合、対策を講じないと、転がり軸受自体に、帰路電流、モータ軸電流等の電流が流れてしまう。転がり軸受に電流が流れた場合、電流の通路となる部分の腐食が進む、所謂電食が発生して、転がり軸受の寿命を著しく短縮してしまう。この様な電食の発生を防止する為、転がり軸受を構成する軌道輪の表面に絶縁層を形成する事で、転がり軸受に電流が流れない様にする電食防止用絶縁転がり軸受が、従来から各種知られている。   In the case of a rolling bearing for supporting rotating shafts of various electric devices such as an electric motor and a generator, currents such as a return current and a motor shaft current flow in the rolling bearing itself unless measures are taken. When an electric current flows through the rolling bearing, so-called electric corrosion occurs, ie, corrosion of a portion serving as a current path progresses, and the life of the rolling bearing is significantly shortened. In order to prevent the occurrence of such electrolytic corrosion, an insulating rolling bearing for preventing electrolytic corrosion that prevents current from flowing through the rolling bearing by forming an insulating layer on the surface of the bearing ring constituting the rolling bearing has been conventionally used. Various known from.

図３は、この様な電食防止用絶縁転がり軸受の従来構造の第１例を示している。転がり軸受は、内輪１の外周面に形成した内輪軌道２と外輪３の内周面に形成した外輪軌道４との間に複数の転動体５を配置する事で、前記内輪１と前記外輪３との相対的回転を自在としている。これら各転動体５は、環状の保持器６により、円周方向等間隔に配置した状態で、転動自在に保持している。尚、図示の例の場合、前記転がり軸受は、深溝玉軸受である。即ち、前記内輪、外輪両軌道２、４の断面形状を円弧形とすると共に、前記各転動体５を玉としている。   FIG. 3 shows a first example of the conventional structure of such an electric corrosion preventing insulated rolling bearing. In the rolling bearing, a plurality of rolling elements 5 are arranged between an inner ring raceway 2 formed on the outer peripheral surface of the inner ring 1 and an outer ring raceway 4 formed on the inner peripheral surface of the outer ring 3, whereby the inner ring 1 and the outer ring 3 are arranged. Relative rotation with is possible. Each of the rolling elements 5 is held by a ring-shaped cage 6 so as to be freely rollable in a state of being arranged at equal intervals in the circumferential direction. In the case of the illustrated example, the rolling bearing is a deep groove ball bearing. That is, the cross-sectional shape of both the inner ring and outer ring raceways 2 and 4 is an arc shape, and each rolling element 5 is a ball.

又、絶縁軌道輪である前記外輪３は、外周面の軸方向に離隔した２箇所位置と軸方向両端面とに係止凹溝７ａ、７ｂを、それぞれ全周に亙って形成している。そして、嵌合側周面である前記外輪３の外周面と、この外輪３の軸方向両端面とを、合成樹脂製の絶縁層８により被覆している。この絶縁層８は、軸方向一端面から他端面まで、切れ目なく連続している。この様な絶縁層８は、前記外輪３を射出成形用の金型内にセットした状態で、これら外輪３の外面と金型の内面との間に画成されるキャビティ内に、高絶縁性の合成樹脂を射出成形する事により形成する。この合成樹脂の一部は、前記各係止凹溝７ａ、７ｂ内に進入して固化するので、前記絶縁層８と前記外輪３とが、合成樹脂の粘着力による接着だけでなく、機械的にも強固に結合固定される。   Further, the outer ring 3 which is an insulating raceway ring is formed with locking concave grooves 7a and 7b over the entire circumference at two positions separated in the axial direction of the outer peripheral surface and both end surfaces in the axial direction. . And the outer peripheral surface of the said outer ring | wheel 3 which is a fitting side peripheral surface, and the axial direction both end surfaces of this outer ring | wheel 3 are coat | covered with the insulating layer 8 made from a synthetic resin. This insulating layer 8 is continuous from the one end surface in the axial direction to the other end surface without a break. Such an insulating layer 8 has a high insulating property in a cavity defined between the outer surface of the outer ring 3 and the inner surface of the mold in a state where the outer ring 3 is set in a mold for injection molding. The synthetic resin is formed by injection molding. A part of this synthetic resin enters into the respective locking grooves 7a and 7b and is solidified, so that the insulating layer 8 and the outer ring 3 are not only bonded by the adhesive force of the synthetic resin but also mechanically. Also firmly bonded and fixed.

この様な構成を有する電食防止用絶縁転がり軸受の場合、前記外輪３を金属製のハウジングに内嵌支持した状態では、前記絶縁層８が、これら外輪３とハウジングとを絶縁する。この結果、これら外輪３とハウジングとの間に電流が流れなくなり、前記転がり軸受の構成各部材１、３、５に、上述した様な電食が発生しなくなる。尚、前記絶縁層８を形成する軌道輪を、図示の様な外輪３に代えて、内輪１とする構造も、従来から各種知られている。   In the case of the insulated rolling bearing for preventing electric corrosion having such a configuration, the insulating layer 8 insulates the outer ring 3 from the housing when the outer ring 3 is fitted and supported in a metal housing. As a result, current does not flow between the outer ring 3 and the housing, and the above-described electrolytic corrosion does not occur in the constituent members 1, 3, and 5 of the rolling bearing. Various types of structures are known in the past in which the race ring forming the insulating layer 8 is replaced by the outer ring 3 as shown in the drawing and the inner ring 1 is used.

又、電食防止とクリープ防止とを図れる電食防止用絶縁転がり軸受として、特許文献１には、図４に示す様なものが記載されている。この図４に示した従来構造の第２例の場合には、外輪３ａの表面を合成樹脂製の絶縁層８ａにより覆うと共に、この絶縁層８ａの外周面に１対の凹溝９、９を形成している。そして、これら両凹溝９、９内に１対の膨張補正層１０、１０の内径側部分を係合させている。これら両膨張補正層１０、１０は、それぞれ前記絶縁層８ａよりも線膨張係数の大きい材料により造られている。尚、図示の例の場合、転がり軸受は、円筒ころ軸受である。即ち、内輪１ａの外周面に形成した内輪軌道２ａと、前記外輪３ａの内周面に形成した外輪軌道４ａとを、それぞれ円筒面状とすると共に、各転動体５ａを円筒ころとしている。又、これに伴い、保持器６ａの形状も、上述した従来構造の第１例の場合と異ならせている。   Further, Patent Document 1 discloses an insulating rolling bearing for preventing electric corrosion and preventing creep, as shown in FIG. In the case of the second example of the conventional structure shown in FIG. 4, the surface of the outer ring 3a is covered with a synthetic resin insulating layer 8a, and a pair of concave grooves 9, 9 are formed on the outer peripheral surface of the insulating layer 8a. Forming. Then, the inner diameter side portions of the pair of expansion correction layers 10 and 10 are engaged in the both concave grooves 9 and 9. Both of these expansion correction layers 10 and 10 are made of a material having a larger linear expansion coefficient than that of the insulating layer 8a. In the case of the illustrated example, the rolling bearing is a cylindrical roller bearing. That is, the inner ring raceway 2a formed on the outer peripheral surface of the inner ring 1a and the outer ring raceway 4a formed on the inner peripheral surface of the outer ring 3a are each formed into a cylindrical surface, and each rolling element 5a is a cylindrical roller. Accordingly, the shape of the cage 6a is also different from that of the first example of the conventional structure described above.

この様な構成を有する従来構造の第２例の場合には、前記絶縁層８ａにより電食防止を図れる。これと共に、前記両膨張補正層１０、１０が、前記両凹溝９、９の底面と、前記外輪３ａを内嵌したハウジング等の相手部材の内周面との間で弾性的に押し潰される事で、この外輪３ａのクリープ防止を図れる。又、温度上昇時には、前記絶縁層８ａ及び前記両膨張補正層１０、１０が膨張する（特に、線膨張係数が比較的大きい、これら両膨張補正層１０、１０がより多い割合で膨張する）事により、前記絶縁層８ａ及び前記両膨張補正層１０、１０の外周面と前記相手部材の内周面との当接部の面圧が高まる。この為、より十分なクリープ防止効果を得られる。   In the case of the second example of the conventional structure having such a configuration, it is possible to prevent electrolytic corrosion by the insulating layer 8a. At the same time, the two expansion correction layers 10 and 10 are elastically crushed between the bottom surfaces of the concave grooves 9 and 9 and the inner peripheral surface of a mating member such as a housing in which the outer ring 3a is fitted. Thus, the outer ring 3a can be prevented from creeping. Further, when the temperature rises, the insulating layer 8a and the both expansion correction layers 10 and 10 expand (particularly, the linear expansion coefficient is relatively large, and both the expansion correction layers 10 and 10 expand at a higher rate). As a result, the contact pressure between the outer peripheral surfaces of the insulating layer 8a and the two expansion correction layers 10 and 10 and the inner peripheral surface of the mating member increases. For this reason, more sufficient creep prevention effect can be obtained.

ところが、上述した従来構造の第２例の場合には、前記絶縁層８ａの厚さが、前記両凹溝９、９を形成した部分で、他の部分に比べて薄くなっている。この為、前記絶縁層８ａによる絶縁性能が、前記両凹溝９、９を形成した部分で、他の部分に比べて弱くなると言う問題がある。又、前記絶縁層８ａのうちで、前記両凹溝９、９の底面の幅方向両端部に存在する角隅部に応力が集中し易い。この為、前記絶縁層８ａの強度を確保するのが難しくなる可能性がある。更に、破損し易い前記絶縁層８ａの大部分（前記膨張補正層１０、１０の設置箇所から外れた部分）が剥き出しになっている。この為、取り扱いの不注意による落下や、組み込み時のハンマリング作業（前記外輪３ａの軸方向側面を叩いて、この外輪３ａをハウジング等の相手部材の内周面に圧入する作業）や、使用時にこの相手部材を介して作用する衝撃荷重等により、前記絶縁層８ａが破損する可能性がある。そして、この絶縁層８ａが破損した場合には、この絶縁層８ａによる絶縁性能が低下すると言った不都合が生じる。   However, in the case of the second example having the conventional structure described above, the thickness of the insulating layer 8a is thinner in the portion where the both concave grooves 9, 9 are formed than in the other portions. For this reason, there is a problem that the insulating performance by the insulating layer 8a is weaker in the portion where the both concave grooves 9, 9 are formed than in the other portions. Further, in the insulating layer 8a, stress tends to concentrate on the corners present at both ends in the width direction of the bottom surfaces of the concave grooves 9, 9. For this reason, it may be difficult to ensure the strength of the insulating layer 8a. Furthermore, most of the insulating layer 8a that is easily damaged (the portion that is out of place of the expansion correction layers 10 and 10) is exposed. For this reason, dropping due to careless handling, hammering work during assembly (working by hitting the axial side surface of the outer ring 3a and press-fitting the outer ring 3a into the inner peripheral surface of a mating member such as a housing) and use There is a possibility that the insulating layer 8a may be damaged by an impact load or the like acting through the mating member. When the insulating layer 8a is damaged, there arises a disadvantage that the insulating performance of the insulating layer 8a is deteriorated.

尚、本発明に関連する他の先行技術文献として、特許文献２がある。この特許文献２に記載された発明は、絶縁軌道輪の表面を被覆する層構造が、絶縁層を含む二層構造になっている点で、次述する本発明と共通する。但し、前記特許文献２に記載された発明の場合には、一方の層が、前記絶縁軌道輪の表面を被覆する金属層であり、他方の層である前記絶縁層が、この金属層の表面を被覆するセラミックスの溶射層である点で、本発明と異なる。前記特許文献２に記載された発明が、この様な構成を採用している理由は、前記絶縁軌道輪を構成する金属が、前記セラミックスに馴染みにくい金属である為、より馴染み易い金属により造られた前記金属層を介在させる事で、前記セラミックスの溶射層の密着性を高める為である。   In addition, there exists patent document 2 as another prior art document relevant to this invention. The invention described in Patent Document 2 is common to the present invention described below in that the layer structure covering the surface of the insulating raceway is a two-layer structure including an insulating layer. However, in the case of the invention described in Patent Document 2, one layer is a metal layer that covers the surface of the insulating raceway, and the other layer is the surface of the metal layer. The present invention is different from the present invention in that it is a ceramic sprayed layer that coats the ceramic. The reason why the invention described in Patent Document 2 adopts such a configuration is that the metal constituting the insulating raceway is a metal that is difficult to adapt to the ceramics, and is therefore made of a metal that is easier to adapt. Further, by interposing the metal layer, the adhesion of the ceramic sprayed layer is enhanced.

特開平７−２０８４６２号公報JP 7-208462 A 特開２００７−１０７７２５号公報JP 2007-107725 A

本発明の電食防止用絶縁転がり軸受は、上述の様な事情に鑑み、絶縁軌道輪のクリープ防止を図れると共に、絶縁層の破損防止を図れる構造を実現すべく発明したものである。   In view of the circumstances as described above, the insulated rolling bearing for preventing electric corrosion of the present invention was invented to realize a structure capable of preventing creep of the insulating race and preventing damage to the insulating layer.

本発明の電食防止用絶縁転がり軸受は、互いに同心に配置された、それぞれが金属製である１対の軌道輪と、これら両軌道輪の互いに対向する面に形成された１対の軌道同士の間に転動自在に設けられた、それぞれが金属製である複数個の転動体とを備える。そして、前記両軌道輪のうちの少なくとも一方である絶縁軌道輪の表面のうちで軌道を形成した面以外の面を、合成樹脂製の絶縁層により被覆している。
特に、本発明の電食防止用絶縁転がり軸受に於いては、前記絶縁層の全体をゴム層により被覆している。 The insulated rolling bearing for preventing electric corrosion of the present invention includes a pair of raceways arranged concentrically and made of metal, respectively, and a pair of raceways formed on opposite surfaces of both raceways. And a plurality of rolling elements each made of metal and provided so as to be freely rollable. And the surface other than the surface which formed the track | orbit among the surfaces of the insulated track ring which is at least one of the both said track rings is coat | covered with the insulating layer made from a synthetic resin.
In particular, in the insulating rolling bearing for preventing electric corrosion of the present invention, the entire insulating layer is covered with a rubber layer.

この様な本発明を実施する場合には、例えば請求項２に記載した発明の様に、前記１対の軌道輪を、内周面に外輪軌道を有する外輪、及び、外周面に内輪軌道を有する内輪とする。そして、前記絶縁軌道輪を、前記外輪と前記内輪とのうちの少なくとも一方とする。又、前記絶縁層により、前記絶縁軌道輪の表面のうちで、軌道を形成していない周面であって使用時に相手部材に嵌合させる嵌合側周面及び軸方向両端面を被覆する。   When implementing the present invention as described above, for example, as in the invention described in claim 2, the pair of race rings is provided with an outer ring having an outer ring raceway on an inner peripheral surface, and an inner ring raceway on an outer peripheral surface. It is assumed to have an inner ring. And let the said insulation track ring be at least one of the said outer ring | wheel and the said inner ring | wheel. Further, the insulating layer covers a peripheral surface that does not form a track on the surface of the insulating raceway and that is fitted to a mating member during use and both end surfaces in the axial direction.

又、この様な請求項２に記載した発明の構成を採用する場合には、例えば請求項３に記載した発明の構成を採用する事ができる。この請求項３に記載した発明の構成を採用する場合には、前記絶縁軌道輪の軸方向両端面のうちの少なくとも一方の軸方向端面のうちで、径方向に関して軌道を形成した周面側の端部に、軸方向に突出する凸部を全周に亙り形成する。そして、この凸部の軸方向先端面を前記絶縁層よりも軸方向外側に突出した位置に存在させて、この絶縁層により被覆されていない面とする。   Further, when adopting the configuration of the invention described in claim 2, it is possible to employ the configuration of the invention described in claim 3, for example. When the configuration of the invention described in claim 3 is adopted, at least one of the axial end surfaces of the insulating raceway in the axial direction is provided on the circumferential surface side where the track is formed in the radial direction. A convex portion protruding in the axial direction is formed on the end portion over the entire circumference. Then, the front end surface in the axial direction of the convex portion is present at a position protruding outward in the axial direction from the insulating layer, and is a surface not covered with the insulating layer.

上述の様に構成する本発明の電食防止用絶縁転がり軸受の場合、絶縁軌道輪を相手部材の周面に締り嵌めで嵌合させた状態では、合成樹脂製の絶縁層よりも摩擦係数の大きいゴム層の周面が、前記相手部材の周面に当接すると共に、このゴム層が、この相手部材の周面と前記絶縁層の周面との間で弾性的に強く押し潰される。この結果、前記ゴム層の周面と前記相手部材の周面との当接部に於ける摩擦抵抗力が十分に確保される事で、前記絶縁軌道輪のクリープ防止を図れる。又、温度上昇時には、前記絶縁層と前記ゴム層とが膨張する（特に、線膨張係数が比較的大きいゴム層がより多い割合で膨張する）事により、このゴム層の周面と前記相手部材の周面との当接部の面圧が高まる為、より十分なクリープ防止効果を得られる。又、本発明の場合には、前記絶縁層の全体を前記ゴム層により被覆している為、このゴム層が緩衝材として機能する事により、前記絶縁層を、外部から作用する衝撃に対して保護できる。従って、取り扱いの不注意による落下や、組み込み時のハンマリング作業や、使用時に前記相手部材を介して作用する衝撃荷重等により、前記絶縁層が破損する事を防止できる。又、本発明の場合には、前記絶縁層の表面に凹溝を形成する必要がない為、この凹溝部分でこの絶縁層の強度や絶縁性能が低下する事を防止できる。更に、本発明の場合、前記ゴム層を構成するゴムも、絶縁性を有する物質である為、前記絶縁層の厚さを従来構造の場合に比べて多少小さくしても、全体としての絶縁性能を十分に確保できる。   In the case of the insulating rolling bearing for preventing electric corrosion of the present invention configured as described above, the friction coefficient is higher than that of the synthetic resin insulating layer in a state where the insulating race is fitted to the peripheral surface of the mating member by an interference fit. The peripheral surface of the large rubber layer comes into contact with the peripheral surface of the mating member, and the rubber layer is elastically and strongly crushed between the peripheral surface of the mating member and the peripheral surface of the insulating layer. As a result, the frictional resistance at the contact portion between the peripheral surface of the rubber layer and the peripheral surface of the mating member is sufficiently ensured, so that the insulation raceway can be prevented from creeping. Further, when the temperature rises, the insulating layer and the rubber layer expand (particularly, a rubber layer having a relatively large linear expansion coefficient expands at a higher rate), so that the peripheral surface of the rubber layer and the mating member Since the surface pressure of the abutting portion with the peripheral surface increases, a more sufficient creep preventing effect can be obtained. In the case of the present invention, since the entire insulating layer is covered with the rubber layer, the rubber layer functions as a cushioning material, so that the insulating layer is subjected to an external impact. Can protect. Therefore, it is possible to prevent the insulating layer from being damaged due to a drop due to careless handling, a hammering operation at the time of assembly, an impact load acting through the counterpart member at the time of use, or the like. In the case of the present invention, since it is not necessary to form a groove on the surface of the insulating layer, it is possible to prevent the strength and insulation performance of the insulating layer from being lowered at the groove portion. Furthermore, in the case of the present invention, since the rubber constituting the rubber layer is also an insulating material, even if the thickness of the insulating layer is slightly smaller than that of the conventional structure, the overall insulation performance Can be secured sufficiently.

又、請求項３に記載した発明の場合には、絶縁軌道輪を相手部材の周面に圧入する際に行うハンマリング作業を、この絶縁軌道輪に設けた凸部の軸方向先端面を叩く事により行える。この凸部の軸方向先端面には絶縁層が被覆されていない為、前記ハンマリング作業の際に、この絶縁層が破損する事を防止できる。   Further, in the case of the invention described in claim 3, hammering work performed when press-fitting the insulating track ring into the peripheral surface of the mating member is performed by hitting the axial end surface of the convex portion provided on the insulating track ring. You can do it. Since the insulating layer is not coated on the tip end surface in the axial direction of the convex portion, the insulating layer can be prevented from being damaged during the hammering operation.

本発明の実施の形態の第１例を示す部分断面図。The fragmentary sectional view which shows the 1st example of embodiment of this invention. 同第２例を示す、外輪の部分断面図。The fragmentary sectional view of the outer ring | wheel which shows the 2nd example. 従来構造の第１例を示す部分断面図。The fragmentary sectional view which shows the 1st example of a conventional structure. 同第２例を示す部分断面図。The fragmentary sectional view which shows the 2nd example.

［実施の形態の第１例］
図１は、請求項１〜２に対応する、本発明の実施の形態の第１例を示している。尚、本例の特徴は、絶縁層８ｂの外側にゴム層１１を追加した点にある。その他の部分の構造及び作用は、前述の図３に示した従来構造の第１例の場合と同様であるから、同等部分には同一符号を付して、重複する説明は省略若しくは簡略にし、以下、本例の特徴部分を中心に説明する。 [First example of embodiment]
FIG. 1 shows a first example of an embodiment of the present invention corresponding to claims 1 and 2. The feature of this example is that a rubber layer 11 is added outside the insulating layer 8b. Since the structure and operation of the other parts are the same as in the case of the first example of the conventional structure shown in FIG. 3 described above, the same parts are denoted by the same reference numerals, and the overlapping description is omitted or simplified. Hereinafter, the description will focus on the features of this example.

本例の場合、前記絶縁層８ｂの表面には、前述した従来構造の第１例の様な凹溝は形成しておらず、この絶縁層８ｂの全体を、前記ゴム層１１により被覆している。即ち、この絶縁層８ｂのうち、外輪３の外周面を被覆した部分の外周面と、この外輪３の軸方向両側面を被覆した部分の外側面とを、それぞれ前記ゴム層１１により被覆している。このゴム層１１は、軸方向一端面から他端面まで、切れ目なく連続している。この様なゴム層１１は、例えば、前記絶縁層８ｂを形成した外輪３を射出成形用の金型内にセットした状態で、これら絶縁層８ｂの外面と金型の内面との間に画成されるキャビティ内に、材料となるゴムを射出成形する事により形成する。或いは、前記ゴム層１１を単体で造った後、このゴム層１１を前記絶縁層８ｂの表面に接着剤により接着する事もできる。   In the case of this example, the surface of the insulating layer 8b is not formed with a groove as in the first example of the conventional structure described above, and the entire insulating layer 8b is covered with the rubber layer 11. Yes. That is, the rubber layer 11 covers the outer peripheral surface of the portion of the insulating layer 8b that covers the outer peripheral surface of the outer ring 3 and the outer surface of the portion of the outer ring 3 that covers both side surfaces in the axial direction. Yes. The rubber layer 11 is continuous from the one end surface in the axial direction to the other end surface without a break. For example, such a rubber layer 11 is defined between the outer surface of the insulating layer 8b and the inner surface of the mold in a state where the outer ring 3 on which the insulating layer 8b is formed is set in an injection mold. It is formed by injection molding rubber as a material in the cavity to be formed. Alternatively, after the rubber layer 11 is made alone, the rubber layer 11 can be adhered to the surface of the insulating layer 8b with an adhesive.

又、本例の場合、前記ゴム層１１を構成するゴムも、絶縁性を有する物質である為、全体として必要となる絶縁性能を確保できる範囲で、前記絶縁層８ｂの厚さを、前述した従来構造の第１例の場合よりも小さくしている。尚、本例の構造を含み、本発明を実施する場合、前記絶縁層８ｂを構成する合成樹脂としては、例えばポリフェニレンサルファイド樹脂の他、従来から電食防止用絶縁転がり軸受の絶縁層材料として使用されている、各種の合成樹脂を採用できる。又、本発明の対象となる転がり軸受の使用温度の上限が１２０℃程度である事を考慮すると、前記ゴム層１１を構成するゴムとしては、例えば、アクリルゴム、フッ素ゴム、シリコンゴム、ニトリルゴム、水素化ニトリルゴム等を採用できる。   In the case of this example, since the rubber constituting the rubber layer 11 is also a substance having an insulating property, the thickness of the insulating layer 8b is set within the range in which the necessary insulating performance can be ensured as a whole. The size is smaller than in the first example of the conventional structure. In addition, when implementing this invention including the structure of this example, as a synthetic resin which comprises the said insulating layer 8b, it is conventionally used as an insulating-layer material of the insulating rolling bearing for an electrolytic corrosion prevention other than a polyphenylene sulfide resin, for example Various synthetic resins can be used. Considering that the upper limit of the operating temperature of the rolling bearing that is the subject of the present invention is about 120 ° C., examples of the rubber constituting the rubber layer 11 include acrylic rubber, fluorine rubber, silicon rubber, and nitrile rubber. Hydrogenated nitrile rubber can be used.

上述の様に構成する本例の電食防止用絶縁転がり軸受の場合、前記外輪３をハウジング等の相手部材の内周面に締り嵌めで嵌合させた状態では、合成樹脂製の前記絶縁層８ｂよりも摩擦係数の大きい前記ゴム層１１の外周面が、前記相手部材の内周面に当接すると共に、このゴム層１１が、この相手部材の内周面と前記絶縁層８ｂの外周面との間で弾性的に強く押し潰される。この結果、前記ゴム層１１の外周面と前記相手部材の内周面との当接部に於ける摩擦抵抗力が十分に確保される事で、前記外輪３のクリープ防止を図れる。又、温度上昇時には、前記絶縁層８ｂと前記ゴム層１１とが膨張する（特に、線膨張係数が比較的大きいゴム層１１がより多い割合で膨張する）事により、このゴム層１１の外周面と前記相手部材の内周面との当接部の面圧が高まる為、より十分なクリープ防止効果を得られる。   In the case of the electric rolling prevention insulating rolling bearing of the present example configured as described above, the insulating layer made of synthetic resin in a state where the outer ring 3 is fitted to the inner peripheral surface of a mating member such as a housing by an interference fit. The outer peripheral surface of the rubber layer 11 having a larger coefficient of friction than 8b is in contact with the inner peripheral surface of the mating member, and the rubber layer 11 is connected to the inner peripheral surface of the mating member and the outer peripheral surface of the insulating layer 8b. It is crushed strongly elastically between. As a result, it is possible to prevent the outer ring 3 from creeping by ensuring a sufficient frictional resistance at the contact portion between the outer peripheral surface of the rubber layer 11 and the inner peripheral surface of the mating member. Further, when the temperature rises, the insulating layer 8b and the rubber layer 11 expand (in particular, the rubber layer 11 having a relatively large linear expansion coefficient expands at a higher rate), so that the outer peripheral surface of the rubber layer 11 Since the surface pressure of the contact portion between the contact member and the inner peripheral surface of the mating member is increased, a more sufficient creep preventing effect can be obtained.

又、本例の場合には、前記絶縁層８ｂの全体を前記ゴム層１１により被覆している為、このゴム層１１が緩衝材として機能する事により、前記絶縁層８ｂを、外部から作用する衝撃に対して保護できる。従って、取り扱いの不注意による落下や、組み込み時のハンマリング作業や、使用時に前記相手部材を介して作用する衝撃荷重等により、前記絶縁層８ｂが破損する事を防止できる。又、本例の場合には、前記絶縁層８ｂの表面に凹溝を形成していない為、この凹溝部分でこの絶縁層８ｂの強度や絶縁性能が低下する事を防止できる。更に、本例の場合には、前記ゴム層１１の絶縁性能を考慮して、前記絶縁層８ｂの厚さを、前述した従来構造の第１例の場合よりも小さくしている。この為、前記絶縁層８ｂと前記ゴム層１１とを合わせた厚さが、徒に大きくなる事はない。従って、前記相手部材に対する前記外輪３の支持剛性が不足する事を防止できる。   In the case of this example, since the entire insulating layer 8b is covered with the rubber layer 11, the rubber layer 11 functions as a buffer material, so that the insulating layer 8b acts from the outside. Can protect against impact. Therefore, it is possible to prevent the insulating layer 8b from being damaged due to a drop due to careless handling, a hammering operation at the time of assembly, an impact load acting through the counterpart member at the time of use, or the like. Further, in the case of this example, since the concave groove is not formed on the surface of the insulating layer 8b, it is possible to prevent the strength and insulating performance of the insulating layer 8b from being lowered at the concave groove portion. Furthermore, in the case of this example, in consideration of the insulating performance of the rubber layer 11, the thickness of the insulating layer 8b is made smaller than that of the first example of the conventional structure described above. For this reason, the combined thickness of the insulating layer 8b and the rubber layer 11 does not increase easily. Accordingly, it is possible to prevent the support rigidity of the outer ring 3 with respect to the counterpart member from being insufficient.

［実施の形態の第２例］
図２は、請求項１〜３に対応する、本発明の実施の形態の第２例を示している。本例の場合、外輪３ｂの軸方向両端面の径方向内端部に、それぞれ軸方向に突出する凸部１２、１２を、全周に亙り形成している。そして、これら両凸部１２、１２の軸方向先端面を絶縁層８ｃよりも軸方向外側に突出させて、それぞれゴム層１１のみにより被覆している。この様に構成する本例の電食防止用絶縁転がり軸受の場合には、前記外輪３ｂをハウジング等の相手部材の内周面に圧入する際に行うハンマリング作業を、前記両凸部１２、１２のうちの何れか一方の軸方向先端面を叩く事により行える。これら両凸部１２、１２の軸方向先端面には前記絶縁層８ｃが被覆されていない為、前記ハンマリング作業の際に、この絶縁層８ｃが破損する（凸部１２に対応する部分以外の部分にまで、亀裂等の損傷が伝播する）事を防止できる。又、前記両凸部１２、１２の軸方向先端面は、前記ゴム層１１により被覆されている為、前記ハンマリング作業の際に前記外輪３ｂに加わる衝撃を緩和して、この外輪３ｂが変形する事を防止できる。尚、前記両凸部１２、１２を形成した、前記外輪３ｂの軸方向両端面の径方向内端部には、ハウジング等の金属製の部材を近接させない為、前記両凸部１２、１２の存在が絶縁不良に結び付く事はない。
その他の部分の構造及び作用は、上述した第１例の場合と同様である為、重複する図示並びに説明は省略する。 [Second Example of Embodiment]
FIG. 2 shows a second example of an embodiment of the present invention corresponding to claims 1 to 3. In the case of this example, convex portions 12 and 12 projecting in the axial direction are formed over the entire circumference at the radially inner end portions of both end surfaces in the axial direction of the outer ring 3b. And the axial direction front end surface of these both convex parts 12 and 12 is made to protrude to an axial direction outer side rather than the insulating layer 8c, and is each coat | covered only with the rubber layer 11. FIG. In the case of the insulated rolling bearing for preventing electric corrosion of this example configured as described above, the hammering operation performed when the outer ring 3b is press-fitted into the inner peripheral surface of a mating member such as a housing, This can be done by striking the axial front end surface of any one of 12. Since the insulating layer 8c is not coated on the axial front end surfaces of the both convex portions 12 and 12, the insulating layer 8c is damaged during the hammering operation (other than the portion corresponding to the convex portion 12). It is possible to prevent damage such as cracks from spreading to the part). Further, since the front end surfaces in the axial direction of the both convex portions 12 and 12 are covered with the rubber layer 11, the impact applied to the outer ring 3b during the hammering operation is reduced, and the outer ring 3b is deformed. Can be prevented. It should be noted that a metal member such as a housing is not brought close to the radially inner ends of the axially opposite end surfaces of the outer ring 3b where the both convex portions 12 and 12 are formed. Presence does not lead to poor insulation.
Since the structure and operation of other parts are the same as in the case of the first example described above, overlapping illustrations and descriptions are omitted.

本発明は、図示の様な単列深溝型のラジアル玉軸受に限らず、アンギュラ型、複列等、他の型式のラジアル玉軸受や、円すいころ軸受、円筒ころ軸受、自動調心ころ軸受、スラスト玉軸受或いはスラストころ軸受等、他の型式の転がり軸受で実施する事もできる。スラスト転がり軸受で実施する場合に絶縁層は、絶縁軌道輪の内外両周面と軸方向片面とに形成する。
又、本発明を実施する場合、絶縁層とゴム層との厚さは、それぞれ必要となる性能（絶縁性能、クリープ防止性能、緩衝性能）を確保できる範囲で、使用目的に応じた調整が可能である。 The present invention is not limited to the single row deep groove type radial ball bearing as shown in the figure, but other types of radial ball bearings such as angular type and double row, tapered roller bearings, cylindrical roller bearings, self-aligning roller bearings, Other types of rolling bearings such as thrust ball bearings or thrust roller bearings can also be used. When the thrust rolling bearing is used, the insulating layer is formed on both the inner and outer peripheral surfaces of the insulating raceway and one axial surface.
Also, when carrying out the present invention, the thickness of the insulating layer and the rubber layer can be adjusted according to the purpose of use within the range that can ensure the required performance (insulation performance, creep prevention performance, buffer performance). It is.

１、１ａ 内輪
２、２ａ 内輪軌道
３、３ａ、３ｂ 外輪
４、４ａ 外輪軌道
５、５ａ 転動体
６、６ａ 保持器
７ａ、７ｂ 係止凹溝
８、８ａ〜８ｃ 絶縁層
９ 凹溝
１０ 膨張補正層
１１ ゴム層
１２ 凸部 DESCRIPTION OF SYMBOLS 1, 1a Inner ring 2, 2a Inner ring track 3, 3a, 3b Outer ring 4, 4a Outer ring track 5, 5a Rolling element 6, 6a Cage 7a, 7b Locking groove 8, 8a-8c Insulating layer 9 Ditch 10 Expansion correction Layer 11 Rubber layer 12 Convex part

Claims (3)

互いに同心に配置された、それぞれが金属製である１対の軌道輪と、これら両軌道輪の互いに対向する面に形成された１対の軌道同士の間に転動自在に設けられた、それぞれが金属製である複数個の転動体とを備え、前記両軌道輪のうちの少なくとも一方である絶縁軌道輪の表面のうちで軌道を形成した面以外の面を合成樹脂製の絶縁層により被覆した電食防止用絶縁転がり軸受に於いて、この絶縁層の全体をゴム層により被覆した事を特徴とする電食防止用転がり軸受。   A pair of raceways arranged concentrically with each other, each made of metal, and a pair of raceways formed on opposite surfaces of both raceways are provided to be freely rollable, respectively. And a plurality of rolling elements made of metal, and covering a surface other than the surface on which the raceway is formed of at least one of the raceways with a synthetic resin insulation layer. An anti-corrosion rolling bearing for electric corrosion prevention, characterized in that the entire insulating layer is covered with a rubber layer. 前記１対の軌道輪が、内周面に外輪軌道を有する外輪と、外周面に内輪軌道を有する内輪とであり、
前記絶縁軌道輪が、前記外輪と前記内輪とのうちの少なくとも一方であり、
前記絶縁層が、前記絶縁軌道輪の表面のうちで、軌道を形成していない周面であって使用時に相手部材に嵌合させる嵌合側周面及び軸方向両端面を被覆している、
請求項１に記載した電食防止用転がり軸受。 The pair of track rings are an outer ring having an outer ring raceway on an inner peripheral surface and an inner ring having an inner ring raceway on an outer peripheral surface;
The insulated raceway is at least one of the outer ring and the inner ring;
The insulating layer is a peripheral surface that does not form a track among the surfaces of the insulating raceway ring and covers a fitting side peripheral surface and both axial end surfaces that are fitted to a mating member during use.
The rolling bearing for preventing electrolytic corrosion according to claim 1. 前記絶縁軌道輪の軸方向両端面のうちの少なくとも一方の軸方向端面のうちで、径方向に関して軌道を形成した周面側の端部に、軸方向に突出する凸部を全周に亙り形成しており、且つ、この凸部の軸方向先端面を、前記絶縁層により被覆されていない面とすると共に、この絶縁層よりも軸方向外側に突出した位置に存在させている、請求項２に記載した電食防止用絶縁転がり軸受。   Protrusions protruding in the axial direction are formed over the entire circumference at the end on the peripheral surface side where the track is formed in the radial direction among at least one of the axial end surfaces of the insulating raceway ring. Further, the axial front end surface of the convex portion is a surface not covered with the insulating layer, and is present at a position protruding outward in the axial direction from the insulating layer. Insulating rolling bearing for preventing electric corrosion as described in 1.
JP2012067221A 2012-03-23 2012-03-23 Insulation rolling bearing for electrolytic corrosion prevention Pending JP2013199954A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106837996A (en) * 2017-03-31 2017-06-13 浙江天马轴承有限公司 One kind insulation deep groove ball bearing
CN107023563A (en) * 2017-05-29 2017-08-08 苏州固特斯电子科技有限公司 A kind of outer glue binding structure of bearing
CN108167323A (en) * 2016-12-07 2018-06-15 斯凯孚公司 Bearing assembly
WO2019156050A1 (en) * 2018-02-07 2019-08-15 株式会社ジェイテクト Electrocorrosion prevented bearing
US10823229B2 (en) 2017-03-24 2020-11-03 Aktiebolaget Skf Rolling-element bearing including an electrically insulating layer
WO2022050165A1 (en) * 2020-09-02 2022-03-10 Ntn株式会社 Roller bearing

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108167323A (en) * 2016-12-07 2018-06-15 斯凯孚公司 Bearing assembly
US10823229B2 (en) 2017-03-24 2020-11-03 Aktiebolaget Skf Rolling-element bearing including an electrically insulating layer
CN106837996A (en) * 2017-03-31 2017-06-13 浙江天马轴承有限公司 One kind insulation deep groove ball bearing
CN107023563A (en) * 2017-05-29 2017-08-08 苏州固特斯电子科技有限公司 A kind of outer glue binding structure of bearing
WO2019156050A1 (en) * 2018-02-07 2019-08-15 株式会社ジェイテクト Electrocorrosion prevented bearing
WO2022050165A1 (en) * 2020-09-02 2022-03-10 Ntn株式会社 Roller bearing

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