JP2004245260A - Fixing structure for rolling bearing - Google Patents

Fixing structure for rolling bearing Download PDF

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JP2004245260A
JP2004245260A JP2003033390A JP2003033390A JP2004245260A JP 2004245260 A JP2004245260 A JP 2004245260A JP 2003033390 A JP2003033390 A JP 2003033390A JP 2003033390 A JP2003033390 A JP 2003033390A JP 2004245260 A JP2004245260 A JP 2004245260A
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Prior art keywords
rolling bearing
outer ring
housing
fixing structure
ring
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JP4222047B2 (en
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Munehisa Taniyama
宗久 谷山
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Koyo Seiko Co Ltd
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Koyo Seiko Co 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
    • F16C27/00—Elastic or yielding bearings or bearing supports, for exclusively rotary movement
    • F16C27/06—Elastic or yielding bearings or bearing supports, for exclusively rotary movement by means of parts of rubber or like materials
    • F16C27/066—Ball or roller bearings
    • 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
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
    • F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
    • F16C19/183—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles
    • F16C19/184—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement
    • 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
    • F16C33/588—Races of sheet metal
    • 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
    • F16C2326/00—Articles relating to transporting
    • F16C2326/20—Land vehicles
    • F16C2326/24—Steering systems, e.g. steering rods or columns

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Steering Controls (AREA)
  • Support Of The Bearing (AREA)
  • Mounting Of Bearings Or Others (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixing structure for a rolling bearing with large damper effect, which prevents a radial clearance of a rolling bearing from blocking at low costs. <P>SOLUTION: An outer ring 3 of the rolling bearing is formed by denting an approximate center portion of a metallic cylinder having an uniform wall at an axial direction along the inside of a whole periphery of the cylinder at a radial direction, adjacent angular-shaped raceways 3a and 3b are formed on both ends of an inner peripheral surface of the outer ring 3 at an axial direction, and a circular recessed portion 20 is formed on an approximate center portion of an outer peripheral surface of the outer ring 3 at an axial direction. The outer ring 3 is firmly fixed on a housing so that an O-ring 15 is provided between the recessed portion 20 of the outer ring 3 and the non-illustrated housing, and shock given from a rotary shaft supported by the rolling bearing is absorbed and damped accordingly. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、例えば、ハンドルコラム用の転がり軸受等の転がり軸受の固定に用いれば好適な転がり軸受の固定構造に関する。
【０００２】
【従来の技術】
従来、転がり軸受の固定構造としては、特開平１１−３４２８５３号公報（特許文献１）に示されたものがある。この転がり軸受の固定構造は、車両用ステアリングのハウジングであるコラムチューブに転がり軸受を固定している。
【０００３】
上記コラムチューブには、軸方向にコ字状の開口部が打ち抜きにより形成されており、上記コ字状の開口部の内側に舌片が形成されている。また、上記舌片と対向する上記コ字状の開口部の反対側には、ストッパが形成されており、上記コ字状の開口部の周方向の両側には、一対の押圧部が形成されている。上記ストッパおよび一対の押圧部は、上記舌片以外のコ字状の開口部の縁部を、コラムチューブの径方向の内側に窪ませて形成している。
【０００４】
この転がり軸受の固定構造では、転がり軸受の外輪の軸方向の一方の端面が上記ストッパに突き当たるまで転がり軸受をコラムチューブの内側に挿入した後、上記舌片の先端が、上記外輪の他方の端面に接触するまで、舌片をコラムチューブの内周面より内側に折り曲げると共に、上記一対の押圧部が、上記外輪の外周面に接触して上記外輪を強固に押圧するまで、上記一対の押圧部をコラムチューブの内周面より内側に更に窪ませて、転がり軸受をコラムチューブに固定している。
【０００５】
また、他の転がり軸受の固定構造に用いられる転がり軸受としては、図２に示すようなものがある。この転がり軸受は、外輪３１と内輪３２とを有する。上記外輪３１の内周の断面円弧状の軌道面３１ａと内輪３２の外周の断面円弧状の軌道面３１ｂとの間に、保持器３４によって保持された複数の玉３３，３３，３３・・・を、周方向に一定の間隔を隔てて配置している。上記転がり軸受は、外輪３１の外周面に設けられた環状溝３５と、外輪３１の外周側に存在する図示しないハウジングとの間にＯリング３６を介装して、このＯリング３６で外輪３１およびハウジングの双方を段発付勢するようにして、外輪３１をハウジングに固定するようにしている。上記Ｏリング３６は、内輪３１の内側に存在する図示しないシャフトからの衝撃を吸収して減衰させる役割も担っている。上記転がり軸受では、外輪３１の径方向の肉厚を確保するために、環状溝３５を、外輪３１の径方向の肉厚が厚い外輪３１の軸方向の端部の外周面に設けている。
【０００６】
【特許文献１】
特開平１１−３４２８５３号公報（第１図、第４図）
【０００７】
【発明が解決しようとする課題】
しかしながら、上記特許文献１の転がり軸受の固定方法では、コラムチューブにコ字状の貫通穴、ストッパおよび押圧部を形成する必要があるので、コラムチューブを製造するときの工数が多大になり、コラムチューブの製造コストが増大するという問題がある。
【０００８】
また、上記従来の転がり軸受の固定方法では、上記一対の押圧部が上記外輪の外周面を強固に押圧するまで、押圧部をコラムチューブの内周面より内側に押圧するようにしたので、転がり軸受の外輪が径方向の内側に変形して、転がり軸受のラジアル隙間詰まりが起きるという問題がある。
【０００９】
一方、図２に示すＯリングを有する転がり軸受をハウジングに固定する転がり軸受の固定方法では、外輪の肉厚を確保するために環状溝を小さくする必要があるので、これに応じてＯリングの径が小さくなり、結果としてシャフトからの衝撃を吸収して減衰させるダンパー効果が小さくなるという問題がある。
【００１０】
そこで、本発明の目的は、製造コストが小さく転がり軸受のラジアル隙間詰まりが起きなくて、ダンパー効果が大きな転がり軸受の固定構造を提供することにある。
【００１１】
【課題を解決するための手段】
上記目的を達成するため、請求項１の発明の転がり軸受の固定構造は、
複列の軌道を有するプレス鋼板製の外輪と、上記外輪の複列の軌道の各々に対応する軌道を有する複数の単列の内輪と、上記外輪の複列の軌道と上記複数の単列の内輪の軌道との間に配置される複列の玉列とを有する転がり軸受を、この転がり軸受の外輪が内嵌されるハウジングに固定する転がり軸受の固定構造であって、
上記外輪の外周面における上記複列の軌道面の間に対応する部分に凹部を形成し、
上記外輪の凹部と上記ハウジングとの間に、上記外輪および上記ハウジングを弾発付勢する弾性体を介装したことを特徴としている。
【００１２】
上記請求項１の発明の転がり軸受の固定構造によれば、上記外輪の外周面における上記複列の軌道面の間に対応する部分に凹部を形成する一方、上記外輪の外周面の凹部とハウジングの間に、上記外輪および上記ハウジングを弾発付勢する弾性体を介装して、上記外輪をハウジングに固定しているので、上記ハウジングに従来のように貫通穴、ストッパおよび押圧部を形成する必要がない。したがって、ハウジングを少ない工数で安価に形成できて、転がり軸受の固定構造の製造コストを大幅に低減できる。
【００１３】
また、上記請求項１の発明の転がり軸受の固定構造によれば、上記外輪の外周面における上記複列の軌道面の間の部分に形成された凹部に適合するように、上記凹部とハウジングとの間に変形自在な弾性体を介装して、外輪をハウジングに固定しているので、外輪の外周面が過度に変形することがなくて、転がり軸受のラジアル隙間詰まりが起きることもない。
【００１４】
また、上記請求項１の発明の転がり軸受の固定構造によれば、上記外輪の外周面における上記複列の軌道面に対応する部分に上記凹部を形成したので、例えば、同じ径方向の肉厚を有する外輪の外周面における上記複列の軌道面の間の部分を径方向の内側にへこますことによって上記凹部を形成できて、この場合、外輪の肉厚を小さくすることなしに、弾性体の大きさを従来に比べて格段に大きくできる。したがって、回転シャフトからの衝撃を、吸収減衰するダンパー効果を大きくできる。
【００１５】
【発明の実施の形態】
以下、本発明を図示の実施の形態により詳細に説明する。
【００１６】
図１は、この発明の一実施形態の転がり軸受の固定構造を示す軸方向の断面図である。
【００１７】
この転がり軸受の固定構造は、ハウジング１と、転がり軸受１０とを備える。上記転がり軸受１０は、二列のアンギュラ玉軸受であり、一つのプレス鋼板製の外輪３と、二つの同一の内輪５，６とを有する。
【００１８】
上記外輪３は、略同じ肉厚を有する円筒の軸方向の略中心部をプレス成形によって径方向の内側に全周に亘って窪ませて形成した環状の凹部２０を有する一方、内周面には、二つの軌道面３ａ，３ｂが左右対称に形成されている。上記外輪３の外周面の軸方向の両端部は、ハウジング１の内周面に嵌合している。
【００１９】
一方、上記二つの内輪５，６は、夫々同じ肉厚を有する円筒の軸方向の一端部を、径方向の外側に湾曲させた形状を有している。上記二つの内輪５，６の湾曲させられた端部の内周面には、夫々一つの軌道面５ａ，６ａが形成されている。上記二つの内輪５，６の夫々を、環状のスペーサ８を介して図示しない回転シャフトに外嵌している。この環状のスペーサ８は、内輪５，６に締まり嵌め状態で嵌合し、内輪５，６が軸方向にばらけることを防止する役割を担っている。
【００２０】
上記二つの内輪５，６は、軌道面５ａ，６ａの夫々が外輪３の二つの軌道面３ａ，３ｂの夫々に対向するように、湾曲部を軸方向の外側に配置した状態で、左右対称に配置されている。
【００２１】
上記外輪３の二列の軌道面３ａ，３ｂと、二つの単列の内輪５，６の軌道面５ａ，６ａとの間に、図示しない保持器によって保持された複数の玉７，７，７・・・を、二列に配置している。
【００２２】
この転がり玉軸受は、二つの内輪５，６の軌道面５ａ，６ａの夫々と、外輪３の二つの軌道面３ａ，３ｂの夫々を対向配置したとき、玉７と軌道面３ａ，３ｂ，５ａ，６ａとの接触角がθ（＞０°）になるように設計されており、スラスト荷重とラジアル荷重を受けることができるようになっている。
【００２３】
また、上記外輪３の環状の凹部２０とハウジング１との間には、弾性体の一例としてのニトリルゴム製のＯリング１５が介装されている。このＯリング１５は、外輪３およびハウジング１を弾発付勢して外輪３をハウジング１に強固に固定する役割と、上記回転シャフトからの衝撃を吸収減衰する役割とを担っている。
【００２４】
上記実施形態の転がり軸受の固定構造によれば、外輪３の二つの軌道面３ａ，３ｂの間の部分に対応する外周面に環状の凹部２０を形成し、この環状の凹部２０とハウジング１との間に、外輪３およびハウジング１を弾発付勢するＯリング１５を介装して、外輪３をハウジング１に強固に固定する構造にしたので、ハウジング１に従来のように貫通穴、ストッパおよび押圧部を形成する必要がない。したがって、ハウジング１を少ない工数で安価に形成できて、転がり軸受の固定構造の製造コストを大幅に低減できる。
【００２５】
また、上記実施形態の転がり軸受の固定構造によれば、外輪３の二つの軌道面３ａ，３ｂの間に対応する外周面の部分に形成された環状の凹部２０に適合するように、凹部２０とハウジング１との間にＯリング１５を介装するので、外輪３の外周面が過度に変形することがなくて、転がり軸受のラジアル隙間詰まりが起きることがない。
【００２６】
また、上記実施形態の転がり軸受の固定構造によれば、略同じ径方向の肉厚を有する円筒の軸方向の略中心部を、径方向の内側に全周に亘って窪ませて外輪３の凹部２０を形成するので、外輪３の肉厚を小さくすることなしに、Ｏリング１５の大きさを従来に比べて格段に大きくできて、回転シャフトからの衝撃を吸収減衰するダンパー効果を大きくできる。
【００２７】
尚、上記実施形態の転がり軸受の固定構造では、外輪３の内周に軸方向に隣接する二つのアンギュラ型の軌道面３ａ，３ｂを形成すると共に、二つの内輪５，６の外周の夫々にアンギュラ型の軌道面５ａ，５ｂを形成したが、この発明の転がり軸受の固定構造では、外輪の内周に軸方向に隣接する二つの円弧状の軌道面を形成すると共に、内輪の外周に円弧状の軌道面を形成しても良い。
【００２８】
また、上記実施形態の転がり軸受の固定構造では、外輪３の内周に軸方向に隣接する二つの軌道面３ａ，３ｂを形成して、この二つの軌道面３ａ，３ｂの間に対応する外周に環状の凹部２０を形成したが、この発明の転がり軸受の固定構造では、外輪の内周に軸方向に隣接する三つ以上の軌道面を形成して、任意の隣接する二つの軌道面の間に環状の凹部を形成するようにしても良い。
【００２９】
また、上記実施形態の転がり軸受の固定構造では、二つの内輪５，６と回転シャフトの間に環状のスペーサ１８を挿入したが、この発明の転がり軸受の固定構造では、環状のスペーサを省略して、内輪を回転シャフトに直接嵌合しても良い。
【００３０】
また、上記実施形態の転がり軸受の固定構造では、弾性体の一例としてのＯリング１５の材質としてニトリルゴムを採用したが、この発明の転がり軸受の固定構造では、弾性体の一例としてのＯリングの材質として、シリコンゴム、フッ素ゴムまたはエチレンプロピレンゴム等のニトリルゴム以外のゴム材質を採用しても良い。また、この発明の転がり軸受の固定構造では、弾性体として、エラストマーや銅や銅に銀メッキを施した金属等の軟性の金属材質を採用しても良い。また、弾性体の断面形状としては、球形に限らず、楕円回転体であっても良い。
【００３１】
また、上記実施形態の転がり軸受の固定構造では、環状の凹部２０とハウジングとの間に、弾性体の一例としてのＯリング１５を介装させたが、この発明の転がり軸受の固定構造では、環状の凹部とハウジングとの間に、弾性体の一例としての角リングを介装しても良い。
【００３２】
尚、この発明の転がり軸受の固定構造を、車両（自転車、自動車等のステアリングを備えた乗物）のステアリングコラム用の転がり軸受等の回転速度が小さい回転シャフトを支持する転がり軸受に適用すると、コスト低減等の効果が得られて特に有益であるが、この発明の転がり軸受の固定構造は、回転速度が小さい回転シャフトを支持する転がり軸受に限定されるものではなく、この発明の転がり軸受の固定構造を、回転速度が大きなシャフトを支持する転がり軸受に適用しても良いことは勿論である。
【００３３】
【発明の効果】
以上より明らかなように、請求項１の発明の転がり軸受の固定構造によれば、外輪の外周面における複列の軌道面の間に対応する部分に凹部を形成し、上記外輪の外周面の凹部とハウジングの間に、上記外輪および上記ハウジングを弾発付勢する弾性体を介装して、上記外輪を上記ハウジングに固定するので、上記ハウジングに貫通穴、ストッパおよび押圧部を形成する必要がなくて、上記ハウジングを少ない工数で安価に形成でき、転がり軸受の固定構造の製造コストを大幅に低減できる。
【００３４】
また、上記請求項１の発明の転がり軸受の固定構造によれば、上記外輪の外周面における上記複列の軌道面の間の部分に形成された凹部に適合するように、上記凹部とハウジングとの間に弾性体を介装して、外輪をハウジングに固定するので、外輪の外周面が過度に変形することがなくて、転がり軸受のラジアル隙間詰まりが起きることもない。
【００３５】
また、上記請求項１の発明の転がり軸受の固定構造によれば、上記外輪の外周面における上記複列の軌道面に対応する部分に上記凹部を形成したので、同じ径方向の肉厚を有する外輪の外周面における上記複列の軌道面の間の部分を径方向の内側にへこますことによって上記凹部を形成できて、外輪の肉厚を小さくすることなしに、弾性体の大きさを従来に比べて格段に大きくできる。したがって、回転シャフトの衝撃を、吸収減衰するダンパー効果を大きくできる。
【図面の簡単な説明】
【図１】本発明の一実施形態の転がり軸受の固定構造の軸方向の断面図である。
【図２】従来の転がり軸受の固定構造を構成する転がり軸受の軸方向の断面図である。
【符号の説明】
１ ハウジング
３ 外輪
３ａ，３ｂ，５ａ，６ａ 軌道面
５，６ 内輪
７ 玉
１０ 玉軸受
１５ Ｏリング
２０ 凹部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a fixing structure of a rolling bearing suitable for use in fixing a rolling bearing such as a rolling bearing for a handle column.
[0002]
[Prior art]
BACKGROUND ART Conventionally, as a fixing structure of a rolling bearing, there is one disclosed in Japanese Patent Application Laid-Open No. 11-342853 (Patent Document 1). In this fixing structure of a rolling bearing, the rolling bearing is fixed to a column tube which is a housing of a vehicle steering.
[0003]
The column tube has a U-shaped opening formed by punching in the axial direction, and a tongue piece is formed inside the U-shaped opening. In addition, a stopper is formed on the opposite side of the U-shaped opening facing the tongue piece, and a pair of pressing portions is formed on both sides in the circumferential direction of the U-shaped opening. ing. The stopper and the pair of pressing portions are formed by recessing the edges of the U-shaped opening other than the tongue piece inward in the radial direction of the column tube.
[0004]
In this fixing structure of a rolling bearing, after the rolling bearing is inserted into the inside of the column tube until one end face in the axial direction of the outer ring of the rolling bearing abuts against the stopper, the tip of the tongue piece becomes the other end face of the outer ring. Until the tongue piece is bent inward from the inner peripheral surface of the column tube until the pair of pressing portions contact the outer peripheral surface of the outer ring and press the outer ring firmly until the pair of pressing portions contact each other. Is further depressed inward from the inner peripheral surface of the column tube to fix the rolling bearing to the column tube.
[0005]
Further, as a rolling bearing used in another structure for fixing a rolling bearing, there is one as shown in FIG. This rolling bearing has an outer ring 31 and an inner ring 32. A plurality of balls 33, 33, 33,... Held by a retainer 34 are provided between an inner raceway surface 31a of the inner circumference of the outer race 31 and an raceway surface 31b of the outer circumference of the inner race 32. Are arranged at regular intervals in the circumferential direction. The rolling bearing has an O-ring 36 interposed between an annular groove 35 provided on the outer peripheral surface of the outer ring 31 and a housing (not shown) existing on the outer peripheral side of the outer ring 31. The outer ring 31 is fixed to the housing by urging both the housing and the housing. The O-ring 36 also has a role of absorbing and attenuating an impact from a shaft (not shown) existing inside the inner ring 31. In the above-mentioned rolling bearing, in order to secure the radial thickness of the outer ring 31, the annular groove 35 is provided on the outer peripheral surface of the axial end of the outer ring 31 whose radial thickness is large.
[0006]
[Patent Document 1]
Japanese Patent Application Laid-Open No. Hei 11-348553 (FIGS. 1 and 4)
[0007]
[Problems to be solved by the invention]
However, in the method of fixing the rolling bearing described in Patent Document 1, it is necessary to form a U-shaped through hole, a stopper, and a pressing portion in the column tube. There is a problem that the manufacturing cost of the tube increases.
[0008]
Further, in the conventional method of fixing a rolling bearing, the pressing portion is pressed inward from the inner circumferential surface of the column tube until the pair of pressing portions firmly presses the outer circumferential surface of the outer ring. There is a problem in that the outer race of the bearing is deformed radially inward, so that the radial clearance of the rolling bearing is blocked.
[0009]
On the other hand, in the method of fixing the rolling bearing having the O-ring shown in FIG. 2 to the housing, the annular groove needs to be small in order to secure the thickness of the outer ring. There is a problem that the diameter is reduced, and as a result, the damper effect of absorbing and attenuating the impact from the shaft is reduced.
[0010]
Therefore, an object of the present invention is to provide a fixing structure for a rolling bearing which has a small manufacturing cost, does not cause clogging of a radial gap of the rolling bearing, and has a large damper effect.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, a fixing structure for a rolling bearing according to the first aspect of the present invention includes:
An outer ring made of a pressed steel plate having multiple rows of tracks, a plurality of single-row inner rings having tracks corresponding to each of the multiple rows of the outer rings, a plurality of single-row tracks of the outer ring, and the plurality of single rows. A rolling bearing fixing structure for fixing a rolling bearing having a double row of balls arranged between a raceway of an inner ring and a housing in which an outer ring of the rolling bearing is internally fitted,
Forming a concave portion in a portion corresponding to between the double row of raceway surfaces on the outer peripheral surface of the outer ring,
An elastic body that elastically urges the outer ring and the housing is interposed between the recess of the outer ring and the housing.
[0012]
According to the rolling bearing fixing structure of the first aspect of the present invention, a concave portion is formed in a portion of the outer peripheral surface of the outer ring corresponding to the double row of raceway surfaces, while a concave portion of the outer peripheral surface of the outer ring and the housing are formed. An elastic body that elastically urges the outer ring and the housing is interposed therebetween to fix the outer ring to the housing, so that a through hole, a stopper, and a pressing portion are formed in the housing as in the related art. No need to do. Therefore, the housing can be formed inexpensively with a small number of man-hours, and the manufacturing cost of the fixing structure of the rolling bearing can be greatly reduced.
[0013]
Further, according to the fixing structure of the rolling bearing of the first aspect of the present invention, the recess and the housing are so formed as to fit into the recess formed on the outer peripheral surface of the outer race between the raceways of the double row. Since the outer ring is fixed to the housing with a deformable elastic body interposed therebetween, the outer peripheral surface of the outer ring is not excessively deformed, and the radial gap of the rolling bearing does not clog.
[0014]
Further, according to the rolling bearing fixing structure of the first aspect of the present invention, since the concave portion is formed in a portion corresponding to the double-row raceway surface on the outer peripheral surface of the outer race, for example, the same radial thickness is provided. By recessing the portion between the raceways of the double row on the outer peripheral surface of the outer ring having a radial inward, the concave portion can be formed.In this case, without reducing the thickness of the outer ring, The size can be much larger than before. Therefore, the damper effect of absorbing and attenuating the impact from the rotating shaft can be increased.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.
[0016]
FIG. 1 is an axial sectional view showing a fixing structure of a rolling bearing according to an embodiment of the present invention.
[0017]
This rolling bearing fixing structure includes a housing 1 and a rolling bearing 10. The rolling bearing 10 is a two-row angular contact ball bearing having one outer ring 3 made of a pressed steel plate and two identical inner rings 5 and 6.
[0018]
The outer ring 3 has an annular concave portion 20 formed by pressing a substantially central portion of a cylinder having substantially the same thickness in the axial direction along the entire circumference inward in the radial direction by press molding, and has an inner peripheral surface. Has two raceway surfaces 3a and 3b formed symmetrically. Both ends of the outer peripheral surface of the outer race 3 in the axial direction are fitted to the inner peripheral surface of the housing 1.
[0019]
On the other hand, the two inner rings 5, 6 each have a shape in which one end in the axial direction of a cylinder having the same thickness is curved outward in the radial direction. One track surface 5a, 6a is formed on the inner peripheral surface of the curved end of the two inner rings 5, 6, respectively. Each of the two inner rings 5 and 6 is externally fitted to a rotating shaft (not shown) via an annular spacer 8. The annular spacer 8 is fitted to the inner races 5 and 6 in a tight fit state, and has a role of preventing the inner races 5 and 6 from being separated in the axial direction.
[0020]
The two inner races 5 and 6 are symmetrical in a state where the curved portions are arranged outside in the axial direction such that the raceway surfaces 5a and 6a face the two raceway surfaces 3a and 3b of the outer race 3, respectively. Are located in
[0021]
A plurality of balls 7, 7, 7 held by a retainer (not shown) between the two rows of raceways 3a, 3b of the outer ring 3 and the raceways 5a, 6a of the two single rows of inner races 5, 6. Are arranged in two rows.
[0022]
This rolling ball bearing has the ball 7 and the raceway surfaces 3a, 3b, 5a when the raceway surfaces 5a, 6a of the two inner races 5, 6 and the two raceway surfaces 3a, 3b of the outer race 3 are arranged opposite to each other. , 6a is designed to have a contact angle of θ (> 0 °) so that it can receive a thrust load and a radial load.
[0023]
An O-ring 15 made of nitrile rubber as an example of an elastic body is interposed between the annular concave portion 20 of the outer ring 3 and the housing 1. The O-ring 15 has a role of resiliently urging the outer ring 3 and the housing 1 to firmly fix the outer ring 3 to the housing 1 and a role of absorbing and attenuating an impact from the rotating shaft.
[0024]
According to the fixing structure of the rolling bearing of the above embodiment, the annular concave portion 20 is formed on the outer peripheral surface corresponding to the portion between the two raceway surfaces 3a and 3b of the outer race 3, and the annular concave portion 20 and the housing 1 are connected to each other. The outer ring 3 and the O-ring 15 for resiliently urging the housing 1 are interposed between them, so that the outer ring 3 is firmly fixed to the housing 1. It is not necessary to form a pressing portion. Therefore, the housing 1 can be formed inexpensively with a small number of man-hours, and the manufacturing cost of the fixing structure of the rolling bearing can be greatly reduced.
[0025]
Further, according to the fixing structure of the rolling bearing of the above embodiment, the recess 20 is adapted to fit into the annular recess 20 formed on the outer peripheral surface corresponding to the space between the two raceway surfaces 3a and 3b of the outer race 3. Since the O-ring 15 is interposed between the outer ring 3 and the housing 1, the outer peripheral surface of the outer race 3 is not excessively deformed, and the radial clearance of the rolling bearing does not clog.
[0026]
Further, according to the fixing structure of the rolling bearing of the above embodiment, the substantially central portion in the axial direction of the cylinder having substantially the same thickness in the radial direction is depressed over the entire circumference inward in the radial direction to form the outer ring 3. Since the recess 20 is formed, the size of the O-ring 15 can be remarkably increased as compared with the related art without reducing the thickness of the outer ring 3, and the damper effect of absorbing and attenuating the impact from the rotating shaft can be increased. .
[0027]
In the rolling bearing fixing structure of the above embodiment, two angular raceways 3a, 3b axially adjacent to each other are formed on the inner periphery of the outer race 3, and the outer periphery of the two inner races 5, 6 is formed on each of the outer races. Although the angular type raceway surfaces 5a and 5b are formed, in the fixing structure of the rolling bearing according to the present invention, two arc-shaped raceway surfaces adjacent in the axial direction are formed on the inner circumference of the outer ring, and the circular shape is formed on the outer circumference of the inner race. An arc-shaped track surface may be formed.
[0028]
Further, in the fixing structure of the rolling bearing according to the above-described embodiment, two raceway surfaces 3a and 3b which are adjacent to each other in the axial direction are formed on the inner periphery of the outer race 3 and the outer periphery corresponding to the space between the two raceway surfaces 3a and 3b. In the rolling bearing fixing structure of the present invention, three or more raceways adjacent to each other in the axial direction are formed on the inner periphery of the outer ring, and any two adjacent raceways are formed. An annular concave portion may be formed between them.
[0029]
In the fixing structure of the rolling bearing of the above embodiment, the annular spacer 18 is inserted between the two inner rings 5 and 6 and the rotating shaft. However, in the fixing structure of the rolling bearing of the present invention, the annular spacer is omitted. Thus, the inner ring may be directly fitted to the rotating shaft.
[0030]
Further, in the fixing structure of the rolling bearing of the above embodiment, nitrile rubber is employed as a material of the O-ring 15 as an example of the elastic body. However, in the fixing structure of the rolling bearing of the present invention, the O-ring as an example of the elastic body is used. As the material of the rubber, a rubber material other than nitrile rubber such as silicon rubber, fluorine rubber or ethylene propylene rubber may be adopted. Further, in the fixing structure of the rolling bearing of the present invention, as the elastic body, a soft metal material such as an elastomer, copper, or a metal obtained by plating copper with silver may be employed. Further, the cross-sectional shape of the elastic body is not limited to a spherical shape, and may be an elliptical rotating body.
[0031]
Further, in the fixing structure of the rolling bearing of the embodiment, the O-ring 15 as an example of the elastic body is interposed between the annular concave portion 20 and the housing. However, in the fixing structure of the rolling bearing of the present invention, A square ring as an example of an elastic body may be interposed between the annular concave portion and the housing.
[0032]
If the fixing structure of the rolling bearing of the present invention is applied to a rolling bearing that supports a rotating shaft having a low rotation speed, such as a rolling bearing for a steering column of a vehicle (a vehicle having a steering wheel such as a bicycle or an automobile), the cost is increased. Although the effect of reduction and the like is obtained, it is particularly beneficial, but the fixing structure of the rolling bearing of the present invention is not limited to the rolling bearing that supports the rotating shaft having a low rotation speed, but the fixing structure of the rolling bearing of the present invention. Of course, the structure may be applied to a rolling bearing that supports a shaft having a high rotation speed.
[0033]
【The invention's effect】
As is apparent from the above description, according to the rolling bearing fixing structure of the first aspect of the present invention, a concave portion is formed in a portion corresponding to between the multiple rows of raceways on the outer peripheral surface of the outer ring, and the outer peripheral surface of the outer ring is formed. Since the outer ring and the elastic body that resiliently urges the housing are interposed between the recess and the housing to fix the outer ring to the housing, it is necessary to form a through hole, a stopper, and a pressing portion in the housing. Therefore, the housing can be formed inexpensively with a small number of man-hours, and the manufacturing cost of the fixing structure of the rolling bearing can be greatly reduced.
[0034]
Further, according to the fixing structure of the rolling bearing of the first aspect of the present invention, the recess and the housing are so formed as to fit into the recess formed on the outer peripheral surface of the outer race between the raceways of the double row. Since the outer ring is fixed to the housing with an elastic body interposed therebetween, the outer peripheral surface of the outer ring is not excessively deformed, and the radial clearance of the rolling bearing does not clog.
[0035]
Further, according to the rolling bearing fixing structure of the first aspect of the present invention, since the concave portion is formed in a portion corresponding to the double row of raceways on the outer peripheral surface of the outer ring, the outer ring has the same radial thickness. The concave portion can be formed by indenting the portion between the double row raceway surfaces on the outer peripheral surface of the outer ring inward in the radial direction, and the size of the elastic body can be conventionally reduced without reducing the thickness of the outer ring. It can be much larger than in comparison. Therefore, the damper effect of absorbing and attenuating the impact of the rotating shaft can be increased.
[Brief description of the drawings]
FIG. 1 is an axial sectional view of a fixing structure of a rolling bearing according to an embodiment of the present invention.
FIG. 2 is an axial sectional view of a rolling bearing constituting a conventional rolling bearing fixing structure.
[Explanation of symbols]
Reference Signs List 1 housing 3 outer ring 3a, 3b, 5a, 6a raceway surface 5, 6 inner ring 7 ball 10 ball bearing 15 O-ring 20 recess

Claims (1)

複列の軌道を有するプレス鋼板製の外輪と、上記外輪の複列の軌道の各々に対応する軌道を有する複数の単列の内輪と、上記外輪の複列の軌道と上記複数の単列の内輪の軌道との間に配置される複列の玉列とを有する転がり軸受を、この転がり軸受の外輪が内嵌されるハウジングに固定する転がり軸受の固定構造であって、
上記外輪の外周面における上記複列の軌道面の間に対応する部分に凹部を形成し、
上記外輪の凹部と上記ハウジングとの間に、上記外輪および上記ハウジングを弾発付勢する弾性体を介装したことを特徴とする転がり軸受の固定構造。An outer ring made of a pressed steel plate having multiple rows of tracks, a plurality of single-row inner rings having tracks corresponding to each of the multiple rows of the outer rings, a plurality of single-row tracks of the outer ring, and the plurality of single rows. A rolling bearing fixing structure for fixing a rolling bearing having a double row of balls arranged between a raceway of an inner ring and a housing in which an outer ring of the rolling bearing is internally fitted,
Forming a concave portion in a portion corresponding to between the double row of raceway surfaces on the outer peripheral surface of the outer ring,
A fixing structure for a rolling bearing, wherein an elastic body that elastically urges the outer ring and the housing is interposed between a concave portion of the outer ring and the housing.
JP2003033390A 2003-02-12 2003-02-12 Rolling bearing fixed structure Expired - Fee Related JP4222047B2 (en)

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