JP2009287658A - Electrolytic corrosion preventive insulating rolling bearing - Google Patents

Electrolytic corrosion preventive insulating rolling bearing Download PDF

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JP2009287658A
JP2009287658A JP2008140458A JP2008140458A JP2009287658A JP 2009287658 A JP2009287658 A JP 2009287658A JP 2008140458 A JP2008140458 A JP 2008140458A JP 2008140458 A JP2008140458 A JP 2008140458A JP 2009287658 A JP2009287658 A JP 2009287658A
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insulating layer
rolling bearing
ceramic
insulating
alumina
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Kenji Kotaki
賢司 小滝
Keisuke Kimura
啓亮 木村
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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
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/07—Fixing them on the shaft or housing with interposition of an element
    • F16C35/077—Fixing them on the shaft or housing with interposition of an element between housing and outer race ring

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Mounting Of Bearings Or Others (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide structure can compatibly secure insulating performance, secure durability and reduce cost at a high level, and moreover prevent creep. <P>SOLUTION: A pair of recess grooves 11, 11 are formed along a whole circumference of an outer surface 8 of an outer ring 3, and an insulation layer 7a made from predetermined ceramics is formed. Elastic rings 12, 12 made from elastic material such as elastomer like rubber are installed to the pair of recess grooves 11, 11. <P>COPYRIGHT: (C)2010,JPO&INPIT

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外輪や内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、例えば特許文献１に記載されている様に、従来から知られている。   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 electric corrosion, by forming an insulating layer on the surface of the outer ring and the inner ring constituting the rolling bearing, an insulating rolling bearing for preventing electric corrosion that prevents current from flowing through the rolling bearing is provided. For example, as described in Patent Document 1, it is conventionally known.

上記特許文献１に記載される等により従来から知られている電食防止用絶縁転がり軸受は、転がり軸受を構成する軌道輪のうちで、相手部材の嵌合支持する部分に、セラミックス、合成樹脂等の絶縁層を形成して成るもので、例えば図３に示す様に構成されている。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を設ける事で、上記内輪１と外輪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。そして、上記外輪３の外周面及び軸方向両端面に、セラミックス溶射層である絶縁層７を形成している。この様な電食防止用絶縁転がり軸受の場合、上記外輪３を金属製のハウジングに内嵌支持した状態では、上記絶縁層７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、上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、絶縁層７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、上記特許文献１に記載されている。   Insulated rolling bearings for preventing electric corrosion, which have been conventionally known, as described in Patent Document 1 above, include ceramics and synthetic resins in a portion of a bearing ring constituting a rolling bearing that is fitted and supported by a mating member. For example, it is configured as shown in FIG. In the rolling bearing, a plurality of rolling elements 5 are provided between the inner ring raceway 2 formed on the outer peripheral surface of the inner ring 1 and the outer ring raceway 4 formed on the inner peripheral surface of the outer ring 3. Relative rotation is free. 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. And the insulating layer 7 which is a ceramic sprayed layer is formed in the outer peripheral surface of the said outer ring | wheel 3, and an axial direction both end surface. In the case of such an insulating rolling bearing for preventing electric corrosion, the insulating layer 7 insulates the outer ring 3 from the housing in a state where 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. A structure in which the bearing ring forming the insulating layer 7 is replaced with the outer ring 3 as shown in the drawing and used as the inner ring 1 is also described in Patent Document 1.

又、特許文献２には、絶縁性能の確保と、耐久性の確保と、低コスト化とを高次元で並立させる事ができる、電食防止用絶縁転がり軸受に関する発明が記載されている。この特許文献２に記載された発明の場合には、絶縁層７を構成するセラミックスを、アルミナ（Al2Ｏ3）を９９重量％以上含有するものとしている。又、これと共に、上記絶縁層７を、両軌道２、４を設けた面以外に形成したセラミックス溶射層の表面を研磨する事により形成したものとしている。更に、このセラミックス溶射層の厚さを、隣り合う面同士の間の折れ曲がり連続部を除いて０．４mm以下とし、このセラミックス溶射層を研磨して得られた上記絶縁層の厚さを、０．２５mm以上としている。この様な構成を採用すれば、絶縁性能の確保と、耐久性の確保と、低コスト化とを高次元で並立させる事ができる。 Further, Patent Document 2 describes an invention related to an insulating rolling bearing for preventing electric corrosion, which can ensure insulation performance, durability, and cost reduction in parallel. In the case of the invention described in Patent Document 2, the ceramic constituting the insulating layer 7 contains 99% by weight or more of alumina (Al 2 O 3 ). In addition, the insulating layer 7 is formed by polishing the surface of the ceramic sprayed layer formed on the surface other than the surface on which both the tracks 2 and 4 are provided. Further, the thickness of the ceramic sprayed layer is set to 0.4 mm or less excluding the bent continuous portion between adjacent surfaces, and the thickness of the insulating layer obtained by polishing the ceramic sprayed layer is set to 0 .25mm or more. By adopting such a configuration, it is possible to arrange insulation performance, durability, and cost reduction at a high level.

又、特許文献３には、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に関する発明が記載されている。この特許文献３に記載された発明の場合には、外周面に凹溝を形成した外輪の表面を、樹脂、合成ゴム等の絶縁被膜により覆うと共に、上記凹溝に弾性リングを装着している。この様な構成を採用すれば、絶縁被膜により電食防止を図れると共に、上記凹溝に装着した上記弾性リングにより、上記外輪のクリープ防止を図れる。但し、この特許文献３に記載された発明の場合には、樹脂、合成ゴム等により絶縁被膜を構成している為、この絶縁被膜の構成によっては、絶縁性能の確保や耐久性の確保、低コスト化を十分に図れない可能性がある。   Patent Document 3 describes an invention related to an insulating rolling bearing for preventing electric corrosion that can prevent electric corrosion and creep. In the case of the invention described in Patent Document 3, the surface of the outer ring having a groove formed on the outer peripheral surface is covered with an insulating coating such as resin or synthetic rubber, and an elastic ring is mounted on the groove. . By adopting such a configuration, it is possible to prevent electrolytic corrosion by the insulating coating and to prevent the outer ring from creeping by the elastic ring mounted in the concave groove. However, in the case of the invention described in Patent Document 3, since the insulating coating is constituted by resin, synthetic rubber, etc., depending on the configuration of this insulating coating, the insulation performance and the durability can be ensured, and the low There is a possibility that the cost cannot be sufficiently achieved.

国際公開第２００７／０４９７２７号パンフレットInternational Publication No. 2007/049727 Pamphlet 特開２００７−１４７０７２号公報JP 2007-147072 A 特開平１０−１５９８４１号公報Japanese Patent Laid-Open No. 10-159841

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て、絶縁性能の確保と、耐久性の確保と、低コスト化とを高次元で並立させる事ができ、しかも、クリープ防止も図れる構造を実現すべく発明したものである。   In view of the above-mentioned circumstances, the insulating rolling bearing for preventing electric corrosion of the present invention can ensure insulation performance, ensure durability, and reduce costs at a high level, and can perform creep. The invention was invented to realize a structure that can also be prevented.

本発明の電食防止用絶縁転がり軸受は、前述した従来から知られている電食防止用絶縁転がり軸受と同様に、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（例えば内輪及び外輪）と、これら両軌道輪の互いに対向する面に形成された１対の軌道面（例えば内輪軌道及び外輪軌道）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（例えば玉）とを備える。
そして、上記両軌道輪のうちの少なくとも一方の軌道輪の表面のうちで軌道面を設けた面以外の面、即ち、ラジアル転がり軸受の場合には、何れかの周面及び軸方向両端面を、スラスト転がり軸受の場合には何れかの軸方向片面及び内外両周面を、セラミックス製の絶縁層により被覆している。 The insulated rolling bearing for preventing electric corrosion of the present invention is a pair of raceways (each made of metal, which are arranged concentrically with each other, like the conventionally known insulated rolling bearing for preventing corrosion. For example, an inner ring and an outer ring) and a pair of raceway surfaces (for example, an inner ring raceway and an outer ring raceway) formed on opposite surfaces of these both raceways are provided so as to be freely rotatable. A plurality of rolling elements (for example, balls) are provided.
Of the surfaces of at least one of the bearing rings, the surface other than the surface provided with the raceway surface, i.e., in the case of a radial rolling bearing, any peripheral surface and both axial end surfaces are provided. In the case of a thrust rolling bearing, any one axial side surface and both inner and outer peripheral surfaces are covered with a ceramic insulating layer.

特に、本発明の電食防止用絶縁転がり軸受に於いては、上記絶縁層を構成するセラミックスを、アルミナ（Al2Ｏ3）を９９重量％以上含有するものとしている。
又、上記絶縁層を、上記両軌道を設けた面以外に形成したセラミックス溶射層の表面を研磨する事により形成したものとしている。
又、このセラミックス溶射層の厚さを、隣り合う面同士の間の折れ曲がり連続部を除いて０．４mm以下とし、このセラミックス溶射層を研磨して得られた上記絶縁層の厚さを、０．２５mm以上としている。
更には、上記軌道輪の周面（例えば外輪の外周面又は内輪の内周面）に全周に亙って凹溝を設けると共に、この凹溝に弾性リング（ゴムの如きエラストマー等の弾性を有する材料により造られた円環状の部材で、例えばＯリング）を、この軌道輪の周面に形成した絶縁層の表面から径方向に突出する状態で装着している。尚、この様に弾性リングが絶縁層の表面から径方向に突出するのは、少なくとも電食防止用絶縁転がり軸受を回転支持部に組み込む前の状態を言う（組み込まれた状態で弾性リングは圧縮され、絶縁層の表面とほぼ同じ高さになる）。 In particular, in the insulating rolling bearing for preventing electric corrosion of the present invention, the ceramic constituting the insulating layer contains 99% by weight or more of alumina (Al 2 O 3 ).
Further, the insulating layer is formed by polishing the surface of the ceramic sprayed layer formed on the surface other than the surface provided with both the tracks.
Further, the thickness of the ceramic sprayed layer is set to 0.4 mm or less excluding the bent continuous portion between adjacent surfaces, and the thickness of the insulating layer obtained by polishing the ceramic sprayed layer is set to 0 mm. .25mm or more.
Further, a concave groove is provided over the entire circumference on the peripheral surface of the raceway ring (for example, the outer peripheral surface of the outer ring or the inner peripheral surface of the inner ring), and an elastic ring (elastomer such as rubber or the like) An annular member made of a material having, for example, an O-ring is mounted so as to protrude in the radial direction from the surface of the insulating layer formed on the peripheral surface of the race. It should be noted that the elastic ring protruding in the radial direction from the surface of the insulating layer in this manner means at least the state before the insulating rolling bearing for preventing galvanic corrosion is incorporated into the rotation support portion (the elastic ring is compressed in the incorporated state). And is almost the same height as the surface of the insulating layer).

又、上述の様な本発明の電食防止用絶縁転がり軸受を実施する場合により好ましくは、請求項２に記載した発明の様に、上記凹溝を１対、軸方向に離隔した状態で設け、これら両凹溝にそれぞれ弾性リングを装着する。更に、上記絶縁層の表面で、これら両弾性リング同士の間部分に潤滑剤を塗布する。尚、この潤滑剤の塗布は、電食防止用絶縁転がり軸受を回転支持部に組み込む以前に行う。
又、好ましくは、請求項３に記載した発明の様に、上記絶縁層を、酸化チタン（TiＯ2）を０．０１〜０．２重量％含有するアルミナの溶射層（酸化チタン以外の残部はアルミナ）とする。
又、好ましくは、請求項４に記載した発明の様に、上記絶縁層であるセラミックス溶射層の厚さ寸法に関する精度と、このセラミックス溶射層を構成するアルミナの付着効率の向上とを目的として、粒径が１０〜５０μｍで、平均粒径が１５〜２５μｍであるアルミナを使用する。 More preferably, when the insulating rolling bearing for preventing electric corrosion of the present invention as described above is implemented, a pair of the concave grooves are provided in the axially separated state as in the invention described in claim 2. The elastic rings are respectively attached to both the concave grooves. Further, a lubricant is applied to a portion between the two elastic rings on the surface of the insulating layer. The lubricant is applied before the electric rolling prevention insulating rolling bearing is incorporated into the rotation support portion.
Further, preferably, as in the invention described in claim 3, the insulating layer is made of an alumina sprayed layer containing 0.01 to 0.2% by weight of titanium oxide (TiO 2 ) (the balance other than titanium oxide is Alumina).
Preferably, as in the invention described in claim 4, for the purpose of improving the accuracy with respect to the thickness of the ceramic sprayed layer as the insulating layer and improving the adhesion efficiency of alumina constituting the ceramic sprayed layer, Alumina having a particle size of 10-50 μm and an average particle size of 15-25 μm is used.

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によれば、絶縁性能の確保と、耐久性の確保と、低コスト化とを高次元で並立させる事ができ、しかも、クリープ防止も図れる。
即ち、絶縁層を、上述したセラミックス製の所定のものとしている為、絶縁性能の確保と、耐久性の確保と、低コスト化とを高次元で並立させる事ができる。尚、この点に関しては、前述した特許文献２に詳しく記載されている。
しかも、本発明の場合には、軌道輪に設けた凹溝に弾性リングを装着している為、この弾性リングによりクリープ防止も図れる。 According to the insulated rolling bearing for preventing electric corrosion of the present invention configured as described above, the insulation performance, the durability, and the cost reduction can be arranged side by side at a high level, and the creep prevention is achieved. Can also be planned.
That is, since the insulating layer is made of the above-mentioned ceramic, the insulating performance, durability, and cost reduction can be arranged at a high level. This point is described in detail in Patent Document 2 described above.
In addition, in the case of the present invention, since the elastic ring is mounted in the groove provided in the race, the creep can be prevented by this elastic ring.

又、請求項２に記載した発明の様に、軸方向に離隔して設けた１対の凹溝にそれぞれ装着した弾性リング同士の間部分に潤滑剤を塗布すれば、軌道輪がクリープした場合でも、この潤滑剤により摩擦に伴う損傷（摩耗）を低減できる（互いに擦れ合う面同士に加わる摩擦力を低減できる）。
又、請求項３に記載した発明の様に、絶縁層を、酸化チタンを０．０１〜０．２重量％含有するアルミナの溶射層とすれば、酸化チタンを含まないホワイトアルミナの場合に比べ、良好な外観の確保を図れる。即ち、酸化チタンを０．０１重量％以上含有させる事により、封孔処理に使用する合成樹脂として、適切な色彩のものを使用する事で、表面に、製品の外観を悪くする程の色むらを生じる事を防止できる。尚、上記酸化チタンを、０．２重量％を越えて含有させると、必要とする絶縁性能を確保する為に要する、上記セラミックス溶射層の厚さが大きくなる。そこで、上記酸化チタンの含有量は、０．０１〜０．２重量％の範囲に規制する。 Further, as in the invention described in claim 2, when the lubricant is applied to the portion between the elastic rings mounted in the pair of concave grooves provided in the axial direction, the track ring creeps. However, this lubricant can reduce the damage (wear) caused by friction (the frictional force applied to the surfaces that rub against each other can be reduced).
Further, as in the invention described in claim 3, if the insulating layer is a sprayed layer of alumina containing 0.01 to 0.2% by weight of titanium oxide, compared with the case of white alumina not containing titanium oxide. It is possible to secure a good appearance. In other words, by containing 0.01% by weight or more of titanium oxide, the use of a resin having an appropriate color as the synthetic resin used for sealing treatment causes uneven color on the surface so as to deteriorate the appearance of the product. Can be prevented. If the titanium oxide is contained in an amount exceeding 0.2% by weight, the thickness of the ceramic sprayed layer required to ensure the required insulation performance increases. Therefore, the titanium oxide content is regulated to a range of 0.01 to 0.2% by weight.

尚、セラミックス溶射層中に於ける、上記酸化チタンの含有量を、０．２重量％以下に抑える事により、溶射層形成時の材料（アルミナ粒）の歩留が多少は悪化する。但し、請求項４に記載した発明の様に、粒径が１０〜５０μｍで、平均粒径が１５〜２５μｍであるアルミナを使用すれば、上記セラミックス溶射層を構成するアルミナの付着効率を向上させる事と合わせて、上記セラミックス溶射層の厚さ寸法に関する精度を向上させ、コスト上昇を抑えられる。即ち、付着効率の向上による材料費の節約と、寸法精度の向上による仕上加工の容易化（仕上加工時間の短縮化）とにより、電食防止用絶縁転がり軸受の製造コストの低廉化を図れる。   In addition, by suppressing the content of the titanium oxide in the ceramic sprayed layer to 0.2% by weight or less, the yield of the material (alumina grains) at the time of forming the sprayed layer is somewhat deteriorated. However, if alumina having a particle diameter of 10 to 50 μm and an average particle diameter of 15 to 25 μm is used as in the invention described in claim 4, the adhesion efficiency of alumina constituting the ceramic sprayed layer is improved. Together with this, the accuracy related to the thickness dimension of the ceramic sprayed layer can be improved, and the cost increase can be suppressed. That is, it is possible to reduce the manufacturing cost of the anti-corrosion insulated rolling bearing by saving the material cost by improving the adhesion efficiency and facilitating the finishing process by shortening the dimensional accuracy (reducing the finishing time).

［実施の形態の第１例］
図１は、請求項１、３、４に対応する、本発明の実施の形態の第１例を示している。本例の場合には、単列深溝型のラジアル玉軸受を構成する外輪３の外周面８に、全周に亙って１対の凹溝１１、１１を、互いに軸方向に離隔した状態で設けている。そして、この様な凹溝１１、１１を設けた上記外輪３の外周面８及び軸方向両端面９、９に、絶縁層７ａを形成している。この絶縁層７ａは、アルミナを９９重量％以上含むセラミックスの溶滴を上記外周面８及び軸方向両端面９、９に噴射して成る、セラミックス溶射層である。尚、上記絶縁層７ａは、酸化チタンを０．０１〜０．２重量％含有するアルミナの溶射層とする。この様なセラミックス溶射層である、上記絶縁層７ａは、上記外周面８及び軸方向両端面９、９の他、この外周面８の軸方向両端縁とこれら軸方向両端面９、９の外周縁とを連続させる、断面四分の一円弧状の折れ曲がり連続部１０、１０の表面も覆っている（勿論、凹溝１１、１１の内面も覆っている）。そして、これら各面を覆っている、上記絶縁層７ａの厚さ寸法のうち、上記外周面８及び軸方向両端面９、９の表面を覆っている部分の厚さ寸法に関しては、０．４mm以下に抑えている（凹溝１１、１１の内面を覆っている部分に関しては、厚さ寸法を０．４mm以下に抑えなくても良い）。そして、これら各部分（凹溝１１、１１の内面は除く）の厚さ寸法を０．４mm以下に抑える事により、上記両折れ曲がり連続部１０、１０の表面を覆っている部分の厚さ寸法を、０．４８mm以下に抑えている。 [First example of embodiment]
FIG. 1 shows a first example of an embodiment of the present invention corresponding to claims 1, 3 and 4. In the case of this example, a pair of concave grooves 11, 11 are axially separated from each other on the outer peripheral surface 8 of the outer ring 3 constituting the single row deep groove type radial ball bearing. Provided. And the insulating layer 7a is formed in the outer peripheral surface 8 and the axial direction both end surfaces 9 and 9 of the said outer ring | wheel 3 which provided such a concave groove 11 and 11. FIG. The insulating layer 7a is a ceramic sprayed layer formed by spraying ceramic droplets containing 99% by weight or more of alumina onto the outer peripheral surface 8 and both axial end surfaces 9, 9. The insulating layer 7a is an alumina sprayed layer containing 0.01 to 0.2% by weight of titanium oxide. The insulating layer 7a, which is such a ceramic sprayed layer, is composed of the outer peripheral surface 8 and both axial end faces 9, 9, as well as the both axial end edges of the outer peripheral face 8 and the outer end faces 9, 9. The surface of the bent continuous portions 10 and 10 having an arc shape with a quarter of a cross section that is continuous with the periphery is also covered (of course, the inner surfaces of the concave grooves 11 and 11 are also covered). Of the thickness dimensions of the insulating layer 7a covering these surfaces, the thickness dimension of the portion covering the surfaces of the outer peripheral surface 8 and the axial end surfaces 9, 9 is 0.4 mm. (The portion covering the inner surfaces of the concave grooves 11 and 11 does not have to have a thickness dimension of 0.4 mm or less). And by suppressing the thickness dimension of each of these parts (excluding the inner surfaces of the concave grooves 11 and 11) to 0.4 mm or less, the thickness dimension of the part covering the surfaces of the both bent continuous parts 10 and 10 is reduced. , 0.48 mm or less.

又、上記絶縁層７ａのうち、上記外周面８及び軸方向両端面９、９の表面を覆っている部分を研磨する（凹溝１１、１１の内面は必要に応じて研磨する）事により、これら各部分を平滑面とし、これら各面８、９と上記外輪３を内嵌固定するハウジングの内面とが密に当接する様にしている。この様な研磨に伴って、上記各面８、９を覆っている上記絶縁層７ａの表面部分が、研磨取代分だけ除去されて、この絶縁層７ａの厚さ寸法が、セラミックス溶射層を形成した状態よりも薄くなっている。但し、上記研磨取代を除去した後の厚さに関しても、０．２５mm以上確保している。これに対して、上記絶縁層７ａのうちで上記両折れ曲がり連続部１０、１０の表面を覆っている部分（並びに凹溝１１、１１の表面を覆っている部分）に関しては、研磨する事なく、そのままの（セラミックスの溶滴を噴射したままの）状態とする。   Also, by polishing the portion of the insulating layer 7a that covers the outer peripheral surface 8 and the surfaces of the axial end surfaces 9, 9 (the inner surfaces of the grooves 11, 11 are polished if necessary) These portions are smooth surfaces so that the surfaces 8 and 9 and the inner surface of the housing to which the outer ring 3 is fitted and fixed are in close contact. With such polishing, the surface portion of the insulating layer 7a covering each of the surfaces 8 and 9 is removed by the polishing allowance, and the thickness dimension of the insulating layer 7a forms a ceramic sprayed layer. It is thinner than the state. However, the thickness after removing the polishing allowance is also secured to 0.25 mm or more. On the other hand, the portion of the insulating layer 7a that covers the surfaces of the bent portions 10 and 10 (and the portion that covers the surfaces of the grooves 11 and 11) is not polished. The state is left as it is (while spraying ceramic droplets).

又、本例の場合には、上記各凹溝１１、１１に、ゴムの如きエラストマー等の弾性を有する材料により造られた円環状の部材、例えばＯリングである弾性リング１２、１２を、それぞれ装着している。これら両弾性リング１２、１２は、上記各凹溝１１、１１に装着した状態で、これら凹溝１１、１１の底部と反対側部分が、上記絶縁層７ａ（の表面）から径方向外方に突出する。そして、この様な弾性リング１２、１２を装着した外輪３を、例えば回転支持部を構成するハウジングに組み込んだ状態で、これら両弾性リング１２、１２は圧縮され、上記絶縁層７ａの表面とほぼ同じ高さになる。   In the case of this example, each of the concave grooves 11 and 11 is provided with an annular member made of an elastic material such as an elastomer such as rubber, for example, an elastic ring 12 or 12 which is an O-ring. Wearing. These elastic rings 12 and 12 are mounted in the respective concave grooves 11 and 11, and the portions opposite to the bottoms of the concave grooves 11 and 11 are radially outward from the insulating layer 7a (surface thereof). Protruding. Then, in a state in which the outer ring 3 having such elastic rings 12 and 12 mounted therein is incorporated into a housing that constitutes, for example, a rotation support portion, both the elastic rings 12 and 12 are compressed, and almost the same as the surface of the insulating layer 7a. It becomes the same height.

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には、絶縁性能の確保と、耐久性の確保と、低コスト化とを高次元で並立させる事ができ、しかも、クリープ防止並びに加工作業の容易化も図れる。
即ち、上記絶縁層７ａを、上述したセラミックス製の所定のものとしている為、絶縁性能の確保と、耐久性の確保と、低コスト化とを高次元で並立させる事ができる。尚、この点に関しては、前述した特許文献２に詳しく記載されている。
しかも、本例の場合には、上記外輪３に設けた１対の凹溝１１、１１に装着した上記弾性リング１２、１２により、クリープ防止も図れる。 In the case of the insulated rolling bearing for preventing electric corrosion of the present example configured as described above, the insulation performance, the durability, and the cost reduction can be arranged side by side at a high level, It is also possible to prevent creep and facilitate processing.
That is, since the insulating layer 7a is made of the above-mentioned ceramic, the insulating performance, durability, and cost can be aligned in a high dimension. This point is described in detail in Patent Document 2 described above.
In addition, in the case of this example, creep prevention can be achieved by the elastic rings 12, 12 mounted in the pair of concave grooves 11, 11 provided in the outer ring 3.

［実施の形態の第２例］
図２は、請求項１〜４に対応する、本発明の実施の形態の第２例を示している。本例の場合には、外輪３の外周面８に形成した絶縁層７ａの表面で、１対の凹溝１１、１１にそれぞれ装着した弾性リング１２、１２同士の間部分に、グリース又は潤滑油等の潤滑剤１３を（全周に亙って）塗布している。尚、この潤滑剤１３の塗布は、本例の電食防止用絶縁転がり軸受を回転支持部（例えば回転支持部を構成するハウジング）に組み込む以前に行う。尚、上記各弾性リング１２、１２（の外周面）には、上記潤滑剤１３が付着しない様にし、これら各弾性リング１２、１２とハウジングの内周面との摩擦に基づいて、クリープを防止できる様にする。
この様な本例の場合は、ハウジングに外輪３を組み込んだ状態で、この外輪３がハウジングに対しクリープした場合（例えば弾性リング１２、１２のクリープ阻止力を超える様な力が外輪３に加わった場合）でも、これら外輪３の外周面８に形成した絶縁層７ａの表面とハウジングの内周面との間に存在する潤滑剤１３の存在に基づき、これら互いに擦れ合う両面同士に加わる摩擦力を低減できる｛摩擦に伴う損傷（摩耗）を低減できる｝。
その他の構成及び作用は、上述した第１例と同様であるから、重複する説明は省略する。 [Second Example of Embodiment]
FIG. 2 shows a second example of an embodiment of the present invention corresponding to claims 1 to 4. In the case of this example, the surface of the insulating layer 7a formed on the outer peripheral surface 8 of the outer ring 3 is grease or lubricating oil between the elastic rings 12 and 12 mounted in the pair of concave grooves 11 and 11, respectively. Or the like is applied (over the entire circumference). The application of the lubricant 13 is performed before the insulating rolling bearing for preventing electric corrosion of the present example is incorporated into a rotation support portion (for example, a housing constituting the rotation support portion). It should be noted that the lubricant 13 is prevented from adhering to the elastic rings 12 and 12 (outer peripheral surfaces thereof), and creep is prevented based on friction between the elastic rings 12 and 12 and the inner peripheral surface of the housing. Make it possible.
In the case of this example, when the outer ring 3 creeps with respect to the housing with the outer ring 3 incorporated in the housing (for example, a force exceeding the creep preventing force of the elastic rings 12 and 12 is applied to the outer ring 3. However, based on the presence of the lubricant 13 existing between the surface of the insulating layer 7a formed on the outer peripheral surface 8 of the outer ring 3 and the inner peripheral surface of the housing, the frictional force applied to both surfaces that rub against each other is obtained. Can be reduced {reducing damage (wear) associated with friction}.
Other configurations and operations are the same as those in the first example described above, and thus redundant description is 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、内外両周面と軸方向片面とに形成する。   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 an angular type and a double row, a tapered roller bearing, a cylindrical roller bearing, a self-aligning roller bearing, Other types of rolling bearings such as thrust ball bearings or thrust roller bearings can also be used. In the case of a thrust rolling bearing, the insulating layer is formed on both the inner and outer peripheral surfaces and one axial surface.

本発明の実施の形態の第１例を示す半部断面図。FIG. 2 is a half sectional view showing a first example of an embodiment of the present invention. 同第２例を示す半部断面図。Sectional sectional drawing which shows the 2nd example. 従来構造の１例を示す半部断面図。The half part sectional view showing an example of conventional structure.

符号の説明Explanation of symbols

１ 内輪
２ 内輪軌道
３ 外輪
４ 外輪軌道
５ 転動体
６ 保持器
７、７ａ 絶縁層
８ 外周面
９ 軸方向端面
１０ 折れ曲がり連続部
１１ 凹溝
１２ 弾性リング
１３ 潤滑剤 DESCRIPTION OF SYMBOLS 1 Inner ring 2 Inner ring track 3 Outer ring 4 Outer ring track 5 Rolling element 6 Cage 7, 7a Insulating layer 8 Outer peripheral surface 9 Axial end surface 10 Bending continuous portion 11 Concave groove 12 Elastic ring 13 Lubricant

Claims (4)

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対の軌道面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、上記両軌道輪のうちの少なくとも一方の軌道輪の表面のうちで軌道面を設けた面以外の面を、セラミックス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、
この絶縁層を構成するセラミックスがアルミナを９９重量％以上含有するものであり、この絶縁層は、上記軌道面を設けた面以外に形成したセラミックス溶射層の表面を研磨する事により形成したものであり、このセラミックス溶射層の厚さは、隣り合う面同士の間の折れ曲がり連続部を除いて０．４mm以下であり、このセラミックス溶射層を研磨して得られた上記絶縁層の厚さは０．２５mm以上であり、
上記軌道輪の周面に全周に亙って凹溝を設けると共に、この凹溝に弾性リングを、この軌道輪の周面に形成した絶縁層の表面から径方向に突出する状態で装着した
事を特徴とする電食防止用絶縁転がり軸受。 Rollers are provided between a pair of raceways arranged concentrically, each made of metal, and a pair of raceways formed on opposite surfaces of these raceways. A plurality of rolling elements each made of metal, and covering a surface of at least one of the two bearing rings other than the surface provided with the raceway surface with a ceramic insulating layer In the electric rolling prevention insulated rolling bearing,
The ceramic constituting this insulating layer contains 99% by weight or more of alumina, and this insulating layer is formed by polishing the surface of the ceramic sprayed layer other than the surface provided with the raceway surface. And the thickness of the ceramic sprayed layer is 0.4 mm or less excluding the bent continuous portion between the adjacent surfaces, and the thickness of the insulating layer obtained by polishing the ceramic sprayed layer is 0. .25mm or more,
A concave groove is provided on the circumferential surface of the raceway over the entire circumference, and an elastic ring is mounted in the concave groove so as to protrude radially from the surface of the insulating layer formed on the circumferential surface of the raceway. Insulated rolling bearing for preventing electric corrosion. 軸方向に離隔した状態で設けられた１対の凹溝にそれぞれ弾性リングを装着し、更に、絶縁層の表面で、これら両弾性リング同士の間部分に潤滑剤を塗布した、
請求項１に記載した電食防止用絶縁転がり軸受。 A pair of concave grooves provided in a state of being separated in the axial direction were each mounted with an elastic ring, and a lubricant was applied to a portion between these elastic rings on the surface of the insulating layer.
An insulating rolling bearing for preventing electrolytic corrosion according to claim 1. 絶縁層を、酸化チタンを０．０１〜０．２重量％含有するアルミナの溶射層とした、
請求項１〜２のうちの何れか１項に記載した電食防止用絶縁転がり軸受。 The insulating layer was an alumina sprayed layer containing 0.01 to 0.2% by weight of titanium oxide.
The insulated rolling bearing for electrolytic corrosion prevention according to any one of claims 1 and 2. 絶縁層であるセラミックス溶射層の厚さ寸法に関する精度と、このセラミックス溶射層を構成するアルミナの付着効率の向上とを目的として、粒径が１０〜５０μｍで、平均粒径が１５〜２５μｍであるアルミナを使用した、
請求項１〜３のうちの何れか１項に記載した電食防止用絶縁転がり軸受。 The particle size is 10 to 50 μm and the average particle size is 15 to 25 μm for the purpose of improving the accuracy with respect to the thickness dimension of the ceramic sprayed layer, which is an insulating layer, and improving the adhesion efficiency of alumina constituting the ceramic sprayed layer. Using alumina,
The insulating rolling bearing for electrolytic corrosion prevention according to any one of claims 1 to 3.
JP2008140458A 2008-05-29 2008-05-29 Electrolytic corrosion preventive insulating rolling bearing Withdrawn JP2009287658A (en)

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US20130049372A1 (en) * 2009-12-08 2013-02-28 Lagerwey Wind B.V. Main bearing for a wind turbine
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US10196083B2 (en) 2016-04-06 2019-02-05 Mando Corporation Bearing assembly of steering apparatus and steering apparatus having the same
CN107269690B (en) * 2016-04-06 2019-06-04 株式会社万都 The bearing assembly of vehicle steering device and the vehicle steering device for having it
US10988164B2 (en) * 2016-10-14 2021-04-27 Thyssenkrupp Presta Ag Electromechanical servo steering system having a spring-loaded bearing arrangement
US10823229B2 (en) 2017-03-24 2020-11-03 Aktiebolaget Skf Rolling-element bearing including an electrically insulating layer
WO2020189372A1 (en) * 2019-03-15 2020-09-24 Ntn株式会社 Rolling bearing
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CN115217851A (en) * 2022-07-14 2022-10-21 人本股份有限公司 Low-cost creep-resistant bearing and surface flatness detection system thereof
CN115217851B (en) * 2022-07-14 2023-09-05 人本股份有限公司 Low-cost creep-resistant bearing and surface flatness detection system thereof
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