JP2004340277A - Crown-shaped holder for rolling bearing, and rolling bearing - Google Patents

Crown-shaped holder for rolling bearing, and rolling bearing Download PDF

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Publication number
JP2004340277A
JP2004340277A JP2003137958A JP2003137958A JP2004340277A JP 2004340277 A JP2004340277 A JP 2004340277A JP 2003137958 A JP2003137958 A JP 2003137958A JP 2003137958 A JP2003137958 A JP 2003137958A JP 2004340277 A JP2004340277 A JP 2004340277A
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Japan
Prior art keywords
pocket
rolling element
rolling
pair
rolling bearing
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Pending
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JP2003137958A
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Japanese (ja)
Inventor
Hiroshi Ishiwada
博 石和田
Manda Noda
万朶 野田
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NSK Ltd
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NSK Ltd
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Priority to JP2003137958A priority Critical patent/JP2004340277A/en
Publication of JP2004340277A publication Critical patent/JP2004340277A/en
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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
    • F16C33/38—Ball cages
    • F16C33/41—Ball cages comb-shaped
    • F16C33/418—Details of individual pockets, e.g. shape or ball retaining means
    • 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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/38—Ball cages
    • F16C33/41—Ball cages comb-shaped
    • F16C33/412—Massive or moulded comb cages, e.g. snap ball cages
    • F16C33/414—Massive or moulded comb cages, e.g. snap ball cages formed as one-piece cages, i.e. monoblock comb cages

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crown-shaped holder for a rolling bearing capable of preventing the generation of holder sound and improving acoustic durability, by suppressing self-induced vibration amount and adhering a suitable amount of lubricant to a rolling element at the all time, and a rolling bearing. <P>SOLUTION: Each pocket 4 of a crown-shaped holder comprises at least a pair of flat side surfaces 10a, 10b oppositely provided at inner surface positioned sliding in a revolving direction of the rolling element, a flat bottom surface 12a provided on a pocket bottom existing in one side in an axial direction of the pocket, a pair of pocket hooks 14, 14 oppositely provided in a circumferential direction in the other side in the axial direction of the pocket, and an opening P provided between the pair of the pocket hooks so as to oppose to the flat bottom surface and having a diameter smaller than that of the rolling element. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、例えば一般電化製品に組み込まれるモータ（エアコン用ファンモータ等）や、自動車部品用小型モータ等の回転支持部分を構成する転がり軸受用冠形保持器及び転がり軸受用保持器を組み込んだ転がり軸受に関する。
【０００２】
【従来の技術】
従来、転がり玉軸受に組み込まれる冠形保持器は、図４（ａ），（ｂ）に示すように、全体が円環状を成した冠形保持器１００が知られている。このような冠形保持器１００には、周方向に沿って所定間隔で複数のポケット１０２が設けられており、各ポケット１０２には、転動体１０４を転動自在に収容保持可能な球面状のポケット面１０６がそれぞれ形成されている。各ポケット１０２のポケット面１０６の直径は、転動体１０４の直径よりも若干大きく設定されていると共に、各ポケット１０２のアキシアル方向の一方側には、転動体１０４の直径よりも開口幅の小さい開口部１０８が形成されている。そして、開口部１０８を介して転動体１０４を押し込むことによって、ポケット１０２内に転動体１０４を収容保持させることができるようになっている（例えば、非特許文献１参照）。
このような冠形保持器１００を備えた転がり軸受の回転動作時において、内輪と外輪との相対回転に伴って複数の転動体１０４は、冠形保持器１００に保持された状態で自転しながら内外輪間を公転する。
【０００３】
【非特許文献１】
ＪＩＳ用語解説シリーズ「ころがり軸受用語 ＪＩＳ Ｂ ０１０４−１９９１準拠」社団法人
日本ベアリング工業会編集、財団法人
日本規格協会発行、１９９３年７月２０日発行、ｐ．３１
【０００４】
【発明が解決しようとする課題】
しかしながら、上述したような従来の冠形保持器１００が組み込まれた転がり軸受では、その回転動作中において、保持器の振動が起因する、いわゆる保持器音が発生する場合がある。保持器音は、転がり軸受の回転動作中における冠形保持器１００の転動体１０４に対する動き量が大きいことに起因して、転動体１０４と保持器との間の滑り摩擦によって保持器がアキシアル方向あるいはラジアル方向に自励振動し、その際、各ポケット１０２（ポケット面１０６）に転動体１０４が衝突することで発生する。
【０００５】
そこで、保持器音の発生を防止するために、例えば図５（ａ）に示すように、各ポケット面１０６の曲率半径を小さくし、保持器の自励振動量を抑制する方法（以下、第１の方法という）が提案されている。
この第１の方法では、転動体１０４に対する保持器１００の動き量を小さくした分だけ保持器の自励振動量をある程度小さくすることはできる。しかし、転動体１０４表面に付着した潤滑剤（グリース、油）が各ポケット１０２のエッジで掻き取られて潤滑性が低下してしまうため、転動体１０４とポケット１０２（ポケット面１０６）との間の摩擦力が増加してしまう。この場合、保持器の自励振動を完全に抑制することが困難になると共に、かかる保持器を組み込んだ転がり軸受の内外輪の軌道溝へ潤滑剤が流入し難くなるため、音響耐久性が低下してしまう。
【０００６】
上述のような保持器ポケットのエッジによるグリース掻き取りを防止するために、第２の方法として、例えば図５（ｂ）に示すように、ポケット面１０６を円筒面１０６ａと球面１０６ｂとを組み合わせて構成する方法が提案されている（特開平１０−２３８５４３号公報など）。この場合、円筒面１０６ａは、アキシアル方向に沿って開口部１０８から球面１０６ｂまで延出し、内径が転動体１０４の直径よりも僅かに大きく設定されている。また、球面１０６ｂ及び開口部１０８は、円筒面１０６ａよりも大きな曲率となっている。この第２の方法では、各ポケット１０２内の転動体１０４は、転がり軸受の回転動作中において円筒面１０６ａに対して転動体１０４に付着した潤滑剤が掻き取られ難くなり、潤滑性を向上させることができる。しかし、保持器は円筒面１０６ａに沿って常時移動自在な状態となるため、保持器の自励振動を完全に抑制することは難しい。
【０００７】
そこで、第３の方法として、例えば図５（ｃ）に示すように、球面１０６ｂ及び開口部１０８を円筒面１０６ａよりも大きな曲率に設定すると共に、これらの曲率中心を互いに交差させる方法が提案されている。この第３の方法では、保持器の自励振動を開口部１０８と球面１０６ｂとの間で抑制することができる。
しかし、開口部１０８と球面１０６ｂとによって転動体１０４に付着した潤滑剤が掻き取られ易くなるため、潤滑性が低下してしまう。
【０００８】
本発明は、従来技術の有するこのような問題点に鑑みなされたもので、その目的とするところは、自励振動量を抑制すると同時に、適量の潤滑剤を転動体に常時付着させることで、保持器音の発生防止と共に音響耐久性の向上を図ることが可能な転がり軸受用冠形保持器及び転がり軸受を提供することにある。
【０００９】
【課題を解決するための手段】
上記目的を達成するために本発明がなした技術的手段は、転動体を転動自在に保持するポケットが、周方向に複数個設けられてなる円環状の冠形保持器であって、上記ポケットは、少なくとも、転動体の公転方向に摺接する内面位置に対向して設けられた一対の平坦状側面と、ポケットのアキシアル方向の一方側に存しているポケット底に設けられた平坦状底面と、ポケットのアキシアル方向の他方側で周方向に対向して設けられた一対のポケット爪と、平坦状底面と対向して前記一対のポケット爪間に設けられている転動体直径よりも小さな開口とを備えてなる転がり軸受用冠形保持器とした。
一対のポケット爪は、転動体を保持可能な凹面が形成されている先端部を夫々に備えている。凹面は、例えば、転動体の直径よりも曲率の大きな球面とする。
また、ポケット爪先端に転動体を接触させた時の転動体中心を基準とした際に、ポケット爪先端部の凹面曲率中心を、前記基準位置から離れた下方に位置させる構成とする。また、一対の平坦状側面における夫々のアキシアル方向長さは、少なくとも転動体が接触角を持って自転する場合の最大周速位置を含む範囲の長さとする。
このような技術的手段によれば、ポケット爪とポケット底の平坦状底面により、保持器の動き量が抑制される。また、転動体の周速の速いポケットの軸方向中心付近では、平坦状側面により転動体に付着したグリースの掻き取りが抑制され、また、ポケット底付近でも、平坦状底面と転動体の間に十分な隙間が確保されるためグリースの掻き取りは起こらない。
【００１０】
【発明の実施の形態】
以下、本発明の一実施形態に係る冠形保持器について、添付図面を参照して説明する。なお、本実施形態は本発明の一実施形態にすぎずこれに限定して解釈されるものではなく、本発明の範囲内において適宜設計変更可能である。
図１（ａ），（ｂ）に示す冠形保持器は、上記従来技術で説明した図４（ａ）のように、全体円環状に形成すると共に、転動体２を転動自在に収容保持するための複数のポケット４が周方向に沿って所定間隔で設けられている。
このような冠形保持器は、例えば図３に示すように、転がり軸受を構成する外輪６と内輪８との間に組み込まれ、複数の転動体２を転動自在に保持することによって外内輪６，８を相対的に回転させることができるようになっている。
この場合、転がり軸受の回転動作中（外内輪６，８が矢印Ｒ１，Ｒ２方向に回転中）において、外輪６と内輪８との相対回転に伴って複数の転動体２は、冠形保持器に保持された状態で自転しながら内外輪間を公転する。なお、図３の転がり軸受には、密封板（シール、シールド）が示されていないが、密封板は必要に応じて取り付けられる。
【００１１】
図１（ａ），（ｂ）に示すように、各々のポケット４は、少なくとも、転動体２の公転方向に摺接する内面位置に対向して設けられた一対の平坦状側面１０ａ，１０ｂと、ポケット４のアキシアル方向の一方側に存しているポケット底１２に設けられた平坦状底面１２ａと、ポケット４のアキシアル方向の他方側で周方向に対向して設けられた一対のポケット爪１４，１４と、平坦状底面１２ａと対向して前記一対のポケット爪１４，１４間に設けられている転動体直径よりも小さな開口Ｐとを備えている。
【００１２】
平坦状側面１０ａ，１０ｂは、夫々ポケット４のアキシアル方向内面（ポケット側面をいう）におけるラジアル方向幅の全域にわたる長さで、かつ所望なアキシアル方向長さをもって構成されている。
平坦状側面１０ａ，１０ｂにおける夫々のアキシアル方向長さは、少なくとも転動体２が接触角を持って自転（図１（ｂ）中において符号Ｔで自転軸を示す。）する場合の最大周速位置２０を含む範囲の長さとする。図１（ｂ）及び図２（ｂ）において、転動体２内で示す破線は、転動体２の最大周速軌跡を示している。
【００１３】
ポケット底１２の平坦状底面１２ａは、ポケット底１２のラジアル方向幅全域にわたる長さで、かつ所望な保持器周方向長さをもって構成されている。
図１の実施形態では、平坦状底面１２ａが、ポケット爪１４，１４間の開口Ｐ幅よりも僅かに長い保持器周方向長さとし、図２の実施形態では、ポケット爪１４，１４間の開口Ｐ幅よりも短い保持器周方向長さとしている。
このような構成により、転動体２と底面１２ａとは略点接触状態となるため、転がり軸受の回転動作中（転動体２の自転中）における摩擦抵抗が抑制される。
【００１４】
ポケット爪１４，１４は、転動体２を保持可能な凹面１５ａ，１５ｂを形成した先端部１５，１５を夫々に備えている。凹面１５ａ，１５ｂは、例えば、転動体２の直径よりも曲率の大きな球面とする。この球面曲率は本発明の範囲内で設計変更可能である。
なお、凹面１５ａ，１５ｂとしては、上述した曲率の球面に限られず、例えば円錐面あるいは多角形面などすべての凹形状を本発明の範囲内において適用することが可能である。
また、本実施形態では、次の構成を採用する。
図１（ｃ）に示すように、ポケット爪先端部１５に転動体２を接触させた時の転動体中心を基準位置０１とした際に、ポケット爪先端部１５の凹面１５ａ（１５ｂ）の曲率Ｒの中心を、前記基準位置０１から離れた下方（図中、太字矢印で示す保持器背面方向）に位置させる構成とする。このような構成により、転動体２は、図１（ｃ）に示すように、爪先端部１５の一部のみで弾性的に保持され、その先端部１５の凹面１５ａ（１５ｂ）と転動体２との間に隙間Ｓが確保される。これにより、保持器エッジによるグリースの掻き取りが抑制される。
また、図１（ｄ）に示すように、ポケット爪先端部１５の凹面１５ａ（１５ｂ）の曲率Ｒの中心を、前記基準位置０１よりも下方（図中、太字矢印で示す保持器背面方向）であるが、基準位置０１近傍に位置させる構成としてもよい。このような構成により、図１（ｃ）の場合よりは僅かに小さい隙間Ｓ１が、先端部１５の凹面１５ａ（１５ｂ）と転動体２との間に確保される。これによれば、グリースの適度な掻き取りがされると共に、保持器組込み時の爪割れや、金型による成型時の無理ぬきによる変形が抑制される。
【００１５】
図２は本発明の他の実施形態で、本実施形態では、平坦状側面１０ａ，１０ｂと平坦状底面１２ａとの境界位置に、強度を高めるためにＲ面１８ａ，１８ｂを設けている。このＲ面１８ａ，１８ｂの長さ・曲率などの設定は特に限定されず本発明の範囲内で設計変更可能である。なお、その他の構成及び作用効果は、上記実施形態と同じでありその説明は省略する。
【００１６】
本実施形態の保持器が軸受に組み込まれ、該軸受が回転動作すると、転動体２は、自転周速が小さいポケット爪先端部１５，１５の凹面１５ａ，１５ｂと平坦状底面１２ａにより保持され、同時に動き量も抑制される。
また、転動体２の自転周速の大きなポケット軸方向中心位置付近は、平坦状側面１０ａ，１０ｂと接触するため、保持器エッジによる転動体２からのグリースの掻き取りが抑制され、常時適量の潤滑剤を転動体２に付着させることができる。この結果、保持器音の発生を抑制することができると同時に、かかる保持器を組み込んだ転がり軸受の内外輪軌道溝へ潤滑剤が流入し易くなるため、音響耐久性を向上させることができ、長寿命な軸受を得ることができる。
また、図面に表された各ポケット４の構成は、本発明の一例であり、全てのポケット４を同一仕様にする必要はなく、例えば本発明と従来例とを組み合わせてもよい。
【００１７】
【発明の効果】
本発明によれば、保持器の動き量が抑制されると同時に、転動体に付着した潤滑剤のエッジ掻き取りが抑制されるため、耐保持器音・音響耐久性に対して、有効な転がり軸受を提供することができる。
【図面の簡単な説明】
【図１】（ａ）は本発明の一実施の形態に係る転がり軸受用保持器の構成を示す図であって、ポケットの部分の拡大斜視図、（ｂ）はポケットの部分の側面図、（ｃ）はポケット爪先端部の凹面の曲率中心を、基準位置から離れた下方（保持器背面方向）に位置させたことを表した部分拡大図、（ｄ）はポケット爪先端部の凹面曲率の中心を、基準位置よりも下方（保持器背面方向）であるが、基準位置近傍に位置させたことを表した部分拡大図。
【図２】（ａ）は、本発明の改良に係る転がり軸受用保持器の構成を示す図であって、ポケットの部分の拡大斜視図、（ｂ）はその側面図、（ｃ）は本発明の転がり軸受用保持器の効果を確認するための実験結果を示す図。
【図３】本発明の保持器が組み込まれた転がり軸受の構成を示す斜視図。
【図４】従来の保持器の構成を示す図であって、（ａ）は斜視図、（ｂ）は部分拡大側面図。
【図５】（ａ）は、保持器音の発生を防止するための従来の第１の方法を説明するための図、（ｂ）は、保持器音の発生を防止するための従来の第２の方法を説明するための図、（ｃ）は、保持器音の発生を防止するための従来の第３の方法を説明するための図。
【符号の説明】
２：転動体
４：ポケット
１０ａ，１０ｂ：平坦状側面
１２：ポケット底
１２ａ：平坦状底面
１４：ポケット爪
１５：ポケット爪先端部
１５ａ，１５ｂ：凹面
Ｐ：開口[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention incorporates, for example, a motor (a fan motor for an air conditioner, etc.) incorporated in a general electric appliance, and a crown bearing for a rolling bearing and a cage for a rolling bearing which constitute a rotation supporting portion of a small motor for an automobile part. It relates to a rolling bearing.
[0002]
[Prior art]
Conventionally, as a crown-shaped cage incorporated in a rolling ball bearing, a crown-shaped cage 100 having an overall annular shape as shown in FIGS. 4A and 4B is known. Such a crown-shaped cage 100 is provided with a plurality of pockets 102 at predetermined intervals along the circumferential direction, and each pocket 102 has a spherical shape capable of rollingly housing and holding a rolling element 104. Each pocket surface 106 is formed. The diameter of the pocket surface 106 of each pocket 102 is set slightly larger than the diameter of the rolling element 104, and an opening having a smaller opening width than the diameter of the rolling element 104 is provided on one axial side of each pocket 102. A part 108 is formed. The rolling element 104 can be housed and held in the pocket 102 by pushing the rolling element 104 through the opening 108 (for example, see Non-Patent Document 1).
During the rotation operation of the rolling bearing provided with such a crown-shaped cage 100, the plurality of rolling elements 104 rotate while being held by the crown-shaped cage 100 with the relative rotation between the inner ring and the outer ring. Revolves between the inner and outer wheels.
[0003]
[Non-patent document 1]
JIS Glossary Series "Rolling Bearing Terminology JIS B 0104-1991 Compliant" edited by the Japan Bearing Industry Association, published by the Japan Standards Association, published on July 20, 1993, p. 31
[0004]
[Problems to be solved by the invention]
However, in the above-described rolling bearing in which the conventional crown-shaped cage 100 is incorporated, a so-called cage sound due to vibration of the cage may be generated during the rotation operation. The cage noise is caused by a large amount of movement of the crowned cage 100 with respect to the rolling element 104 during the rotation operation of the rolling bearing, and the cage is moved in the axial direction by sliding friction between the rolling element 104 and the cage. Alternatively, self-excited vibration occurs in the radial direction. At this time, the vibration is generated by the rolling element 104 colliding with each pocket 102 (pocket surface 106).
[0005]
Therefore, in order to prevent the occurrence of cage sound, for example, as shown in FIG. 5A, a method of reducing the radius of curvature of each pocket surface 106 and suppressing the amount of self-excited vibration of the cage (hereinafter referred to as a Method 1) has been proposed.
In the first method, the amount of self-excited vibration of the cage can be reduced to some extent by the amount by which the amount of movement of the cage 100 with respect to the rolling elements 104 is reduced. However, the lubricant (grease, oil) adhering to the surface of the rolling element 104 is scraped off at the edge of each pocket 102 and the lubricity is reduced, so that the gap between the rolling element 104 and the pocket 102 (pocket surface 106) is reduced. Frictional force increases. In this case, it is difficult to completely suppress the self-excited vibration of the cage, and it is difficult for the lubricant to flow into the raceway grooves of the inner and outer rings of the rolling bearing incorporating the cage, so that the acoustic durability is reduced. Resulting in.
[0006]
In order to prevent grease scraping by the edge of the cage pocket as described above, as a second method, for example, as shown in FIG. 5 (b), a pocket surface 106 is formed by combining a cylindrical surface 106a and a spherical surface 106b. A configuration method has been proposed (JP-A-10-238543). In this case, the cylindrical surface 106a extends from the opening 108 to the spherical surface 106b along the axial direction, and the inner diameter is set slightly larger than the diameter of the rolling element 104. Further, the spherical surface 106b and the opening 108 have a larger curvature than the cylindrical surface 106a. In the second method, the rolling elements 104 in the pockets 102 are less likely to scrape the lubricant adhered to the rolling elements 104 from the cylindrical surface 106a during the rotation operation of the rolling bearing, thereby improving lubricity. be able to. However, since the cage is always movable along the cylindrical surface 106a, it is difficult to completely suppress the self-excited vibration of the cage.
[0007]
Therefore, as a third method, for example, as shown in FIG. 5C, a method has been proposed in which the spherical surface 106b and the opening 108 are set to have a curvature larger than that of the cylindrical surface 106a, and these centers of curvature intersect with each other. ing. According to the third method, the self-excited vibration of the cage can be suppressed between the opening 108 and the spherical surface 106b.
However, since the lubricant attached to the rolling elements 104 is easily scraped off by the opening 108 and the spherical surface 106b, the lubricity is reduced.
[0008]
The present invention has been made in view of such problems of the related art, and aims at suppressing the amount of self-excited vibration and simultaneously adhering an appropriate amount of lubricant to the rolling element, An object of the present invention is to provide a crowned cage for a rolling bearing and a rolling bearing, which can prevent generation of cage sound and improve acoustic durability.
[0009]
[Means for Solving the Problems]
The technical means achieved by the present invention to achieve the above object is an annular crown-shaped retainer in which a plurality of pockets for rollingly holding a rolling element are provided in a circumferential direction, The pocket has at least a pair of flat side surfaces provided opposed to inner surface positions in sliding contact with the revolving direction of the rolling element, and a flat bottom surface provided on a pocket bottom existing on one axial side of the pocket. A pair of pocket claws provided in the circumferential direction on the other side of the pocket in the axial direction, and an opening smaller than the diameter of a rolling element provided between the pair of pocket claws opposed to the flat bottom surface. And a crowned cage for a rolling bearing comprising:
Each of the pair of pocket claws has a distal end formed with a concave surface capable of holding the rolling element. The concave surface is, for example, a spherical surface having a larger curvature than the diameter of the rolling element.
In addition, the center of the concave curvature of the tip end portion of the pocket claw is positioned below and spaced away from the reference position with respect to the center of the rolling member when the rolling element is brought into contact with the tip end of the pocket claw. The axial length of each of the pair of flat side surfaces is at least the range including the maximum peripheral speed position when the rolling elements rotate at a contact angle.
According to such technical means, the amount of movement of the retainer is suppressed by the pocket claw and the flat bottom surface of the pocket bottom. In addition, near the axial center of the pocket where the peripheral speed of the rolling element is high, scraping of grease adhering to the rolling element is suppressed by the flat side surface, and also near the pocket bottom, between the flat bottom surface and the rolling element. Grease is not scraped because a sufficient gap is secured.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a crown retainer according to an embodiment of the present invention will be described with reference to the accompanying drawings. Note that the present embodiment is merely an embodiment of the present invention, and is not to be construed as being limited thereto, and the design can be appropriately changed within the scope of the present invention.
1 (a) and 1 (b), the crown-shaped cage is formed in an entire annular shape as shown in FIG. 4 (a) described in the above-mentioned prior art, and the rolling element 2 is rotatably received and held. Are provided at predetermined intervals along the circumferential direction.
As shown in FIG. 3, for example, such a crown type retainer is incorporated between an outer ring 6 and an inner ring 8 constituting a rolling bearing, and holds a plurality of rolling elements 2 so as to freely roll. 6, 8 can be relatively rotated.
In this case, during the rotation operation of the rolling bearing (the outer and inner rings 6 and 8 are rotating in the directions of the arrows R1 and R2), the plurality of rolling elements 2 are mounted on the crown-shaped cage with the relative rotation between the outer ring 6 and the inner ring 8. Revolves between the inner and outer wheels while rotating in the state of being held. Although a sealing plate (seal, shield) is not shown in the rolling bearing of FIG. 3, the sealing plate is attached as necessary.
[0011]
As shown in FIGS. 1 (a) and 1 (b), each pocket 4 has at least a pair of flat side surfaces 10a and 10b provided opposite to inner surface positions of the rolling element 2 which are in sliding contact with the revolving direction. A flat bottom surface 12a provided on the pocket bottom 12 on one side of the pocket 4 in the axial direction, and a pair of pocket claws 14 provided on the other side in the axial direction of the pocket 4 in the circumferential direction. 14 and an opening P smaller than the diameter of the rolling element provided between the pair of pocket claws 14 facing the flat bottom surface 12a.
[0012]
Each of the flat side surfaces 10a and 10b has a desired length in the axial direction on the inner surface of the pocket 4 (the side surface of the pocket) over the entire radial width.
The axial length of each of the flat side surfaces 10a and 10b is the maximum peripheral speed position when at least the rolling element 2 rotates with a contact angle (the rotation axis is indicated by a symbol T in FIG. 1B). The length is a range including 20. In FIG. 1B and FIG. 2B, a broken line shown in the rolling element 2 indicates the maximum peripheral speed locus of the rolling element 2.
[0013]
The flat bottom surface 12a of the pocket bottom 12 has a length that covers the entire radial width of the pocket bottom 12 and a desired length in the circumferential direction of the cage.
In the embodiment of FIG. 1, the flat bottom surface 12a has a length in the circumferential direction of the retainer slightly longer than the width of the opening P between the pocket claws 14, 14, and in the embodiment of FIG. The cage circumferential length is shorter than the P width.
With such a configuration, the rolling element 2 and the bottom surface 12a are substantially in point contact with each other, so that the frictional resistance during the rotation operation of the rolling bearing (while the rolling element 2 rotates) is suppressed.
[0014]
Each of the pocket claws 14 has a distal end portion 15 formed with a concave surface 15a, 15b capable of holding the rolling element 2, respectively. The concave surfaces 15a and 15b are, for example, spherical surfaces having a larger curvature than the diameter of the rolling elements 2. This spherical curvature can be changed in design within the scope of the present invention.
Note that the concave surfaces 15a and 15b are not limited to the spherical surfaces having the above-described curvature, and all concave shapes such as a conical surface or a polygonal surface can be applied within the scope of the present invention.
In the present embodiment, the following configuration is employed.
As shown in FIG. 1 (c), upon a rolling element center when contacting the rolling element 2 in the pocket claw end portion 15 and the reference position 0 1, the concave 15a of the pocket claw end portion 15 of (15b) the center of curvature R, (in the figure, the cage rear direction indicated by the bold arrow) was downwardly away from the reference position 0 1 configured to be located. With such a configuration, the rolling element 2 is elastically held by only a part of the claw tip 15 as shown in FIG. 1C, and the concave surface 15a (15b) of the tip 15 and the rolling element 2 Is secured between them. Thereby, scraping of grease by the retainer edge is suppressed.
Further, as shown in FIG. 1 (d), in the lower (Fig than the center of curvature R of the concave 15a of the pocket claw end portion 15 (15b), the reference position 0 1, cage rear direction indicated by the bold arrow ), but it may be configured to be positioned in the reference position 0 1 neighborhood. With this configuration, a slightly small gap S 1 than the case of FIG. 1 (c), is secured between the concave 15a (15b) and the rolling element 2 of the tip 15. According to this, the grease is appropriately scraped off, and the crack due to the nail cracking at the time of assembling the retainer and the deformation due to the unreasonable removal at the time of molding with the mold are suppressed.
[0015]
FIG. 2 shows another embodiment of the present invention. In this embodiment, R surfaces 18a and 18b are provided at the boundary between the flat side surfaces 10a and 10b and the flat bottom surface 12a to increase the strength. The settings of the lengths and curvatures of the R surfaces 18a and 18b are not particularly limited, and the design can be changed within the scope of the present invention. Note that the other configuration and operation and effect are the same as those of the above-described embodiment, and the description thereof will be omitted.
[0016]
When the cage of the present embodiment is incorporated in a bearing and the bearing rotates, the rolling element 2 is held by the concave surfaces 15a, 15b and the flat bottom surface 12a of the pocket claw tip portions 15, 15 having a low rotation peripheral speed. At the same time, the amount of movement is suppressed.
In addition, the vicinity of the center position in the pocket axis direction where the rotation peripheral speed of the rolling element 2 is large is in contact with the flat side surfaces 10a and 10b. A lubricant can be attached to the rolling elements 2. As a result, the occurrence of cage noise can be suppressed, and at the same time, since the lubricant easily flows into the inner and outer raceway grooves of the rolling bearing incorporating the cage, acoustic durability can be improved, A long-life bearing can be obtained.
Further, the configuration of each pocket 4 shown in the drawings is an example of the present invention, and it is not necessary that all pockets 4 have the same specifications. For example, the present invention may be combined with a conventional example.
[0017]
【The invention's effect】
According to the present invention, the amount of movement of the cage is suppressed, and at the same time, the edge scraping of the lubricant attached to the rolling elements is suppressed. Bearings can be provided.
[Brief description of the drawings]
FIG. 1A is a diagram showing a configuration of a rolling bearing retainer according to an embodiment of the present invention, in which an enlarged perspective view of a pocket portion, FIG. 1B is a side view of a pocket portion, (C) is a partially enlarged view showing that the center of curvature of the concave surface of the tip of the pocket claw is positioned below (away from the back of the cage) away from the reference position, and (d) is the concave curvature of the tip of the pocket claw. 3 is a partially enlarged view showing that the center of is located below the reference position (toward the back of the cage) but in the vicinity of the reference position.
2A is a diagram showing a configuration of a rolling bearing retainer according to an improvement of the present invention, in which an enlarged perspective view of a pocket portion, FIG. 2B is a side view thereof, and FIG. The figure which shows the experimental result for confirming the effect of the cage for rolling bearings of this invention.
FIG. 3 is a perspective view showing a configuration of a rolling bearing in which the cage of the present invention is incorporated.
4A and 4B are diagrams showing a configuration of a conventional cage, wherein FIG. 4A is a perspective view and FIG. 4B is a partially enlarged side view.
FIG. 5A is a diagram for explaining a first conventional method for preventing generation of a cage sound, and FIG. 5B is a diagram illustrating a conventional second method for preventing generation of a cage sound. FIG. 3C is a diagram for explaining the second method, and FIG. 3C is a diagram for explaining a third conventional method for preventing generation of a cage sound.
[Explanation of symbols]
2: rolling element 4: pockets 10a, 10b: flat side surface 12: pocket bottom 12a: flat bottom surface 14: pocket claw 15: pocket claw tip portions 15a, 15b: concave surface P: opening

Claims (6)

転動体を転動自在に保持するポケットが、周方向に複数個設けられてなる円環状の冠形保持器であって、
上記ポケットは、少なくとも、
転動体の公転方向に摺接する内面位置に対向して設けられた一対の平坦状側面と、
ポケットのアキシアル方向の一方側に存しているポケット底に設けられた平坦状底面と、
ポケットのアキシアル方向の他方側で周方向に対向して設けられた一対のポケット爪と、
平坦状底面と対向して前記一対のポケット爪間に設けられている転動体直径よりも小さな開口とを備えてなることを特徴とする転がり軸受用冠形保持器。An annular crown-shaped retainer in which a plurality of pockets for rollingly holding a rolling element are provided in a circumferential direction,
The pocket is at least
A pair of flat side surfaces provided opposite to the inner surface position of the rolling element that slides in the revolving direction,
A flat bottom provided at the bottom of the pocket, which is located on one side in the axial direction of the pocket,
A pair of pocket claws provided in the circumferential direction on the other side of the pocket in the axial direction,
An opening smaller than the diameter of the rolling element provided between the pair of pocket claws so as to face the flat bottom surface, wherein the crown retainer for a rolling bearing is provided. 一対のポケット爪は、転動体を保持可能な凹面が形成されている先端部を夫々に備えていることを特徴とする請求項１に記載の転がり軸受用冠形保持器。The crowned cage for a rolling bearing according to claim 1, wherein each of the pair of pocket claws has a tip portion having a concave surface capable of holding a rolling element. 凹面は、転動体の直径よりも曲率の大きな球面であることを特徴とする請求項２に記載の転がり軸受用冠形保持器。The crowned cage for a rolling bearing according to claim 2, wherein the concave surface is a spherical surface having a curvature larger than the diameter of the rolling element. ポケット爪先端部に転動体を接触させた時の転動体中心を基準位置とした際に、
凹面の曲率の中心を、前記基準位置から保持器背面方向に離して位置させたことを特徴とする請求項２又は３のいずれかに記載の転がり軸受用冠形保持器。When the rolling element center when the rolling element is brought into contact with the pocket claw tip is set as the reference position,
The crown cage for a rolling bearing according to claim 2, wherein a center of the curvature of the concave surface is located away from the reference position in a rear direction of the cage. 5. 一対の平坦状側面における夫々のアキシアル方向長さは、少なくとも転動体が接触角を持って自転する場合の最大周速位置を含む範囲の長さとすることを特徴とする請求項１乃至４のいずれかに記載の転がり軸受用冠形保持器。The axial length of each of the pair of flat side surfaces is at least a range including a maximum peripheral speed position when the rolling element rotates with a contact angle. A crowned cage for a rolling bearing according to any one of the claims. 外輪と内輪との間に組み込まれ、複数の転動体を転動自在に保持する保持器を備えた転がり軸受であって、
保持器は、転動体を転動自在に保持するポケットが、周方向に複数個設けられており、上記ポケットは、少なくとも、
転動体の公転方向に摺接する内面位置に対向して設けられた一対の平坦状側面と、
ポケットのアキシアル方向の一方側に存しているポケット底に設けられた平坦状底面と、
ポケットのアキシアル方向の他方側で周方向に対向して設けられた一対のポケット爪と、
平坦状底面と対向して前記一対のポケット爪間に設けられている転動体直径よりも小さな開口とを備えてなることを特徴とする転がり軸受。A rolling bearing with a retainer that is incorporated between an outer ring and an inner ring and holds a plurality of rolling elements so as to be able to roll freely,
The retainer is provided with a plurality of pockets that hold the rolling elements so as to freely roll in the circumferential direction, and the pockets are at least
A pair of flat side surfaces provided opposite to the inner surface position of the rolling element that slides in the revolving direction,
A flat bottom provided at the bottom of the pocket, which is located on one side in the axial direction of the pocket,
A pair of pocket claws provided in the circumferential direction on the other side of the pocket in the axial direction,
A rolling bearing having an opening smaller than the diameter of the rolling element provided between the pair of pocket claws so as to face the flat bottom surface.
JP2003137958A 2003-05-15 2003-05-15 Crown-shaped holder for rolling bearing, and rolling bearing Pending JP2004340277A (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
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Publication Number Publication Date
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ID=33527491

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2811188A2 (en) 2013-05-17 2014-12-10 Jtekt Corporation Ball bearing
DE102016207176A1 (en) * 2016-04-27 2017-06-22 Schaeffler Technologies AG & Co. KG Rolling bearing cage
CN109844336A (en) * 2016-10-17 2019-06-04 日本精工株式会社 Angular contact ball bearing retainer, angular contact ball bearing and bearing arrangement
KR102064458B1 (en) * 2018-07-05 2020-01-09 주식회사 베어링아트 Cage for bearing

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2811188A2 (en) 2013-05-17 2014-12-10 Jtekt Corporation Ball bearing
US9127716B2 (en) 2013-05-17 2015-09-08 Jtekt Corporation Ball bearing
DE102016207176A1 (en) * 2016-04-27 2017-06-22 Schaeffler Technologies AG & Co. KG Rolling bearing cage
CN109844336A (en) * 2016-10-17 2019-06-04 日本精工株式会社 Angular contact ball bearing retainer, angular contact ball bearing and bearing arrangement
KR102064458B1 (en) * 2018-07-05 2020-01-09 주식회사 베어링아트 Cage for bearing

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