JP2005003145A - Retainer for rolling bearing and rolling bearing - Google Patents

Retainer for rolling bearing and rolling bearing Download PDF

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Publication number
JP2005003145A
JP2005003145A JP2003169001A JP2003169001A JP2005003145A JP 2005003145 A JP2005003145 A JP 2005003145A JP 2003169001 A JP2003169001 A JP 2003169001A JP 2003169001 A JP2003169001 A JP 2003169001A JP 2005003145 A JP2005003145 A JP 2005003145A
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JP
Japan
Prior art keywords
pocket
cage
rolling element
rolling
raceway surface
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2003169001A
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Japanese (ja)
Inventor
Akira Suzuki
晃 鈴木
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NSK Ltd
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NSK Ltd
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Publication date
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Priority to JP2003169001A priority Critical patent/JP2005003145A/en
Publication of JP2005003145A publication Critical patent/JP2005003145A/en
Pending legal-status Critical Current

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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
    • F16C33/412—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
    • 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

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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 reduce noises resulting from a retainer in a rolling bearing in which rolling elements such as balls and rollers are incorporated between the raceway surfaces of an inner ring and an outer ring and the rolling elements are held by the retainer. <P>SOLUTION: This rolling bearing comprises the inner ring having the raceway surface formed at the outer peripheral part, the outer ring having the raceway surface formed at the inner peripheral part, the plurality of rolling elements incorporated between the raceway surface of the inner ring and the raceway surface of the outer ring, and the retainer holding the rolling elements. Pockets storing the plurality of rolling elements are formed in the retainer, and the pocket edges on the inner peripheral sides of the pockets and the pocket edges on the outer peripheral sides thereof are disposed with their phases shifted in the circumferential direction of the retainer. By this, lubrication oil adhered to the surfaces of the rolling elements becomes less scraped off by the pocket edges, lubricating performance can be increased, a constraint force on the rolling elements by the retainer can be secured, and the noises of the retainer can be reduced. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は転がり軸受用保持器並びに転がり軸受に係り、特に、保持器騒音の低減に関する。
【０００２】
【従来の技術】
内輪と外輪の軌道面間に玉やころ等の転動体を組み込み、この転動体を保持器によって保持する転がり軸受において、保持器に起因する騒音を低減することが要望されている。このような保持器騒音の主な原因の一つとして、保持器に形成され転動体を収容するポケットの内面のエッジ部（ポケット・エッジ部）において潤滑が安定しないために、スティック・スリップが起こり、保持器が転動体に対して相対的に周方向の不安定な挙動を示すことが挙げられる。このようなスリップ・スティックが発生する原因として、軸受が回転する際に、転動体の自転と保持器の公転に起因して、ポケットエッジが転動体表面に付着している潤滑油を掻きとることが原因であるといわれている。
【０００３】
これに対し、従来、ポケットエッジによる転動体表面からの潤滑油の掻きとりを防止するため、ポケットエッジ部に面取り処理を施すことが提案されている。（例えば、特許文献１および２を参照。）
【０００４】
【特許文献１】
特開平１０−８２４２４号公報（第１頁、図１等）
【特許文献２】
特開平１１―１３７６９号公報（第１頁、図３等）
【０００５】
【発明が解決しようとする課題】
しかしながら、上述した従来技術のようにポケットエッジ部に面取りを施す場合、スティック・スリップ防止の効果を奏するためには、ある程度面取りを大きくする必要があるが、面取りを大きくすると、保持器による転動体の拘束力が小さくなってしまう。このため、保持器の動き量が大きくなり、保持器騒音が増大してしまう。
上述した問題に鑑み、本発明の課題は、保持器騒音を低減することにある。
【０００６】
【課題を解決する手段】
本発明は、転動体を収容するためのポケットが周方向に所定の間隔で設けられた保持器であって、このポケットの内周側のポケットエッジおよび外周側のポケットエッジを、この保持器の周方向に位相をずらして配置した転がり軸受用保持器によって上述した課題を解決する。
また、外周部に軌道面が形成されてなる内輪と、内周部に軌道面が形成されてなる外輪と、内輪の軌道面と外輪の軌道面との間に組み込まれた複数の転動体と、転動体を保持する保持器とを有して構成され、保持器には複数の転動体をそれぞれ収容するポケットが形成され、このポケットの内周側のポケットエッジおよび外周側のポケットエッジを、この保持器の周方向に位相をずらして配置した転がり軸受によって上述した課題を解決する。
【０００７】
これらの本発明によれば、軸受の回転時に、転動体が接するポケット内面とこの転動体とは、保持器の内周側又は外周側の一方のポケットエッジ部において接するとともに、他方のポケットエッジ部では、ポケット内面と転動体とは離間し、両者間には隙間が形成される。そして、この隙間側からポケット内面と転動体とが接する側に向けて、転動体の表面に付着した潤滑油が転動体の自転によって進入するように軸受の回転方向を設定することによって、転動体の表面に付着した潤滑油がポケット内に入るときに、ポケット入り側のポケットエッジによって掻き落とされにくくなる。これによって、潤滑性能が向上し、スティック・スリップの発生が抑制されて保持器騒音が低減される。また、転動体はポケット内面と転動体とが接する側およびポケット内面と転動体とが非常に小さい隙間をもって離間する側のポケットエッジによって小さい動き量に拘束され、その結果、ポケットエッジに面取りを施す従来技術よりも保持器による転動体の拘束力が増し、これによっても保持器騒音が低減される。
【０００８】
また、各ポケットに収容される転動体の中心に対し保持器の周方向一方側においては、保持器の内周側又は外周側何れか一方のポケットエッジが転動体に接しかつ保持器の内周側又は外周側他方のポケットエッジは転動体と離間し、該転動体の中心に対し周方向他方側においては、保持器の前記内周側又は外周側何れか一方のポケットエッジは転動体と離間しかつ保持器の前記内周側又は外周側他方のポケットエッジは転動体と非常に小さい隙間をもって離間する構成としてもよい。この場合において、内輪と外輪とを所定の方向に相対的に回転させたときに、転動体の表面に付着した潤滑油が、保持器の前記周方向一方側においては、この転動体の自転によってポケットに入る側のポケットエッジは転動体と離間し、この潤滑油がポケットから出る側のポケットエッジは転動体と接し、保持器の前記周方向の他方側においては、この転動体の自転によってポケットに入る側のポケットエッジは転動体と離間し、この潤滑油がポケットから出る側のポケットエッジは、転動体と非常に小さい隙間をもって離間する構成とするとよい。
【０００９】
さらに、ポケット内面の保持器軸方向視形状が、このポケット内に収容される転動体表面の保持器の軸方向視形状から、この保持器の径方向に対し傾斜した方向に張り出した弧状に形成されるようにしてもよい。なお、ここで卵形とは、鶏卵の側面視投影形状に似た形状をいう。また、卵形に限らず、円形や楕円形としてもよい。
【００１０】
また、上述した各発明を適用した場合、その効果を奏することができるのは、軸受を所定の一方向に回転させた場合である。そこで、内輪と外輪との相対的な回転方向を指定する表示が付されるようにしてもよい。例えば、回転方向を示す表示等を軸受の外部から見える箇所に付すとよい。また、内輪又は外輪の端面に、識別記号を付すようにしてもよい。また、内輪と外輪との間に転動体および保持器を挟んで対向する一対の密封板が設けられ、これら一対の密封板にそれぞれ異なった色を着色してもよい。ここで、密着板は、いわゆるシールド形、非接触シール形および接触シール形のいずれであってもよい。
【００１１】
【発明の実施の形態】
以下、本発明を適用してなる転がり軸受の一実施形態について説明する。図１は、本実施形態の転がり軸受を径方向に切って見た状態を示す断面図である。図１に示すように、軸受１は、いわゆる非接触シール形の単列深溝玉軸受として構成されている。軸受１は、外周部に軌道面が形成されてなる内輪３と、内輪３と略軸心を揃えて配列され、内周部に軌道面が形成されてなる外輪５と、内輪３の軌道面と外輪５の軌道面との間に組み込まれる転動体である複数の鋼球７とを有する。さらに、軸受１は、複数の鋼球７を保持するいわゆる冠型の保持器９を有する。そして、内輪３と外輪５との間隔に、鋼球７および保持器９を挟んで対向する一対の非接触シール１１、１３が設けられている。各シール１１、１３は、それぞれ外輪５のシール溝に外径側が固定され、内径側が内輪３に対し非接触となっている。そして、各シール１１、１３には、それぞれ異なった色の着色がなされている。
【００１２】
内輪３には、外周面の軸方向略中央部に、周方向に沿って延在する溝状の軌道面１５が形成されている。そして、内輪３の外周面のうち、軌道面１５を挟んだ両側の領域であるいわゆる肩部には、それぞれ周方向に沿って延在し、シール１１、１３の内周縁部を位置させるシール溝１７、１９が形成されている。一方、外輪５には、内周面の軸方向略中央部に、周方向に沿って延在する溝状の軌道面２１が形成されている。そして、外輪５の内周面のうち、軌道面２１を挟んだ両側の領域であるいわゆる肩部には、それぞれ周方向に沿って延在し、シール１１、１３の外周縁部が固定されるシール溝２３、２５が形成されている。
【００１３】
保持器９は、いわゆる冠型の保持器として構成されている。図２は、本実施形態における保持器９の拡大斜視図である。図２に示すように、保持器９には、鋼球７に対して軸方向一方側に設けられた環状部２７が設けられ、軸受１に組み込まれる複数の鋼球７をそれぞれ収容するポケット３１が、周方向略等間隔に形成されている。爪部２９は、環状部２７の端面を円弧状に凹ませて形成された凹部３３の周方向両端部に設けられ、ポケット３１は、この凹部３３と、これに隣接する爪部２９の側部とによって構成されている。ポケット内面３５は、凹部３３から爪部２９のポケット３１内側の側部にかけて連続的に形成されている。ポケット内面３５は、略球面状の凹曲面として形成されるが、その詳細については後述する。なお、本明細書において、ポケット内面３５と、保持器の内周面および外周面がそれぞれ接する縁部を、それぞれポケットエッジ３７、３９と称して以下説明する。
【００１４】
図３は、本実施形態におけるポケット３１部の軸方向視拡大断面図であって、軸受１を回転させたときの動作を示す図である。図３においては、一例として外輪５を固定し、内輪３を、図３に向かって反時計方向に回転させた例を示している。従って、鋼球７は、図３に向かって時計回りに自転し、これによって図３に向かって反時計周りに公転する。そして、保持器９もまた鋼球７の公転に伴って図３に向かって反時計周りに公転する。本実施形態においては、図３に示すように、保持器９の内周側のポケットエッジ３７が、外周側のポケットエッジ３９よりも、保持器９の公転方向における周方向前方となるように、保持器９の中心に対する位相をずらして（すなわち、内周側のポケットエッジ３７が、外周側のポケットエッジ３９に対し、図中反時計方向にずれている。）設けられていることを特徴とする。そして、ポケット内面３５の、保持器９の軸方向視断面形状は、保持器９の公転方向前方においては、鋼球７の表面に対して保持器９の内周側かつ公転方向前方に張り出した円弧４１に含まれる弧状に形成されている。一方、保持器９の公転方向後方においては、ポケット内面３５の、保持器９の軸方向視断面形状は、鋼球７の表面よりも保持器９の外周側かつ公転方向後方に張り出した円弧４３に含まれる弧状に形成されている。
【００１５】
これによって、保持器９の公転方向の前方側においては、ポケット内面３５は、保持器９の外周側のポケットエッジ３９側において鋼球７の表面と接する一方、内周側のポケットエッジ３７側においては、隙間を隔てて鋼球７の表面に対向する。すなわち、鋼球７の表面に付着する潤滑油がポケット３１に入る入り側のポケットエッジ３７は鋼球７の表面から離間し、その反対側の出側のポケットエッジ３９は鋼球７の表面に接する。そして、ポケット内面３５と鋼球７の表面との間の隙間４５は、保持器９の内周側から外周側にかけて、徐々に狭くなるように構成されている。
【００１６】
一方、保持器９の公転方向の後方側においては、ポケット内面３５は、保持器９の内周側のポケットエッジ３７側において鋼球７の表面と非常に小さい隙間をもって離間する一方、外周側のポケットエッジ３９側においては、隙間を隔てて鋼球７の表面に対向する。すなわち、鋼球７の表面に付着する潤滑油がポケット３１に入る入り側のポケットエッジ３９は鋼球７の表面から離間し、その反対側の出側のポケットエッジ３７は鋼球７の表面に非常に小さい隙間をもって離間する。そして、ポケット内面３５と鋼球７の表面との隙間４７は、保持器９の外周側から内周側にかけて、徐々に狭くなるように構成されている。なお、隙間４５および隙間４７は、図３に示すように、その保持器９軸方向視断面形状が、三日月の一端側のような形状となる。
【００１７】
以上のように、本実施形態によれば、軸受１の回転時に、鋼球７の表面に付着した潤滑油は、隙間４５、４７側からポケットエッジ３７、３９に掻き落とされずにポケット３１内に入るから、ポケット内面３５と鋼球７の表面との摺動面部における潤滑が良好となり、スティック・スリップの発生が低減される。また、鋼球７は、その表面と接する側のポケットエッジ３９および非常に小さい隙間をもって離間するポケットエッジ３７によって保持器９に小さい動き量に拘束されるから、保持器９振動の発生も抑制される。これによって、保持器騒音が低減される効果がある。
【００１８】
また、シール１１、１３にそれぞれ異なった色の着色を施しているから、この色を目印として、上述した効果が得られる回転方向を識別しやすく、常にポケットエッジ３７、３９によって潤滑油が掻き取られにくい回転方向で軸受１を使用することが容易である。なお、この回転方向の識別のためには、シールへの着色に代え、内輪又は外輪の端面に、識別記号を付与（具体的には、例えば刻印を打つ）してもよい。
【００１９】
なお、本発明は、上述した実施形態に限定されるものではなく、その発明の範囲内で適宜変更を加えることが可能である。例えば、上述した実施形態においては、保持器はいわゆる冠型であるが、もみ抜き形や波型の保持器を用いてもよい。また、転動体も球（玉）に限らず、ころ軸受としてもよい。その他内輪と外輪の形状や、シール又はシールド等の密封板の構成や有無についても、適宜変更を加えることが可能である。
【００２０】
また、上述した実施形態においては、ポケット内面は球面状の凹面であるが、これに限らず、任意の平面又は曲面とすることが可能である。例えば、保持器の軸方向視断面形状を、任意の曲線又は直線状としたり、あるいは折線状に形成してもよい。
【００２１】
【発明の効果】
本発明によれば、保持器騒音を低減することができる。
【図面の簡単な説明】
【図１】本発明を適用してなる転がり軸受の一実施形態の径方向視断面図である。
【図２】図１の軸受における保持器の斜視図である。
【図３】図１の軸受における保持器ポケット部の軸方向視拡大断面図であって、軸受を回転させたときの動作を示す図である。
【符号の説明】
１ 軸受
３ 内輪
５ 外輪
７ 鋼球
９ 保持器
１１ シール
１３ シール
１５ 軌道面
２１ 軌道面
３１ ポケット
３５ ポケット内面
３７ ポケットエッジ
３９ ポケットエッジ
４５ 隙間
４７ 隙間[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rolling bearing cage and a rolling bearing, and more particularly to reduction of cage noise.
[0002]
[Prior art]
In rolling bearings in which rolling elements such as balls and rollers are incorporated between the raceways of the inner ring and the outer ring and the rolling elements are held by a cage, it is desired to reduce noise caused by the cage. One of the main causes of such cage noise is that stick-slip occurs because the lubrication is not stable at the inner edge (pocket edge) of the pocket that is formed in the cage and accommodates the rolling elements. The cage exhibits an unstable behavior in the circumferential direction relative to the rolling element. The cause of the occurrence of such slip sticks is that when the bearing rotates, the pocket edge scrapes off the lubricating oil adhering to the surface of the rolling element due to the rotation of the rolling element and the revolution of the cage. Is said to be the cause.
[0003]
On the other hand, in order to prevent the scraping of the lubricating oil from the rolling element surface by the pocket edge, it has been proposed to chamfer the pocket edge portion. (For example, see Patent Documents 1 and 2.)
[0004]
[Patent Document 1]
JP-A-10-82424 (first page, FIG. 1 etc.)
[Patent Document 2]
JP-A-11-13769 (first page, FIG. 3 etc.)
[0005]
[Problems to be solved by the invention]
However, when chamfering the pocket edge portion as in the prior art described above, it is necessary to increase the chamfer to some extent in order to achieve the effect of preventing stick-slip, but if the chamfer is increased, the rolling element by the cage The binding force will be reduced. For this reason, the amount of movement of the cage increases, and the cage noise increases.
In view of the above problems, an object of the present invention is to reduce cage noise.
[0006]
[Means for solving the problems]
The present invention is a cage in which pockets for accommodating rolling elements are provided at predetermined intervals in the circumferential direction, and the pocket edge on the inner circumferential side and the pocket edge on the outer circumferential side of the pocket are connected to the cage. The above-described problems are solved by a rolling bearing cage arranged with a phase shifted in the circumferential direction.
Further, an inner ring having a raceway surface formed on the outer periphery, an outer ring having a raceway surface formed on the inner periphery, and a plurality of rolling elements incorporated between the raceway surface of the inner ring and the raceway surface of the outer ring, And a holder for holding the rolling elements, and the holder is formed with a pocket for accommodating each of the plurality of rolling elements, and the pocket edge on the inner peripheral side and the pocket edge on the outer peripheral side of the pocket, The above-mentioned problems are solved by the rolling bearings arranged with the phases shifted in the circumferential direction of the cage.
[0007]
According to these aspects of the present invention, the inner surface of the pocket with which the rolling element comes into contact with the rolling element at the time of rotation of the bearing is in contact with one pocket edge portion on the inner peripheral side or outer peripheral side of the cage, and the other pocket edge portion. Then, the pocket inner surface and the rolling element are separated from each other, and a gap is formed between them. Then, by setting the rotation direction of the bearing so that the lubricating oil adhering to the surface of the rolling element enters by the rotation of the rolling element from the gap side toward the side where the pocket inner surface and the rolling element come into contact, the rolling element When the lubricating oil adhering to the surface enters the pocket, it becomes difficult to be scraped off by the pocket edge on the pocket entering side. As a result, the lubrication performance is improved, the occurrence of stick-slip is suppressed, and the cage noise is reduced. Further, the rolling element is constrained to a small amount of movement by the pocket edge on the side where the pocket inner surface and the rolling element are in contact with each other and the pocket inner surface and the rolling element are separated by a very small gap, thereby chamfering the pocket edge. Compared with the prior art, the restraint force of the rolling element by the cage is increased, which also reduces the cage noise.
[0008]
In addition, on one side in the circumferential direction of the cage with respect to the center of the rolling element accommodated in each pocket, the pocket edge on either the inner circumferential side or the outer circumferential side of the cage is in contact with the rolling element and the inner circumference of the cage. The pocket edge on the other side is separated from the rolling element, and the pocket edge on either the inner circumferential side or the outer circumferential side of the cage is separated from the rolling element on the other circumferential side with respect to the center of the rolling element. In addition, the other pocket edge on the inner peripheral side or outer peripheral side of the cage may be separated from the rolling element with a very small gap. In this case, when the inner ring and the outer ring are relatively rotated in a predetermined direction, the lubricating oil adhering to the surface of the rolling element is caused by the rotation of the rolling element on one side in the circumferential direction of the cage. The pocket edge on the side entering the pocket is separated from the rolling element, the pocket edge on the side from which this lubricant exits the pocket is in contact with the rolling element, and the pocket on the other side in the circumferential direction of the cage is caused by the rotation of the rolling element. The pocket edge on the entering side is separated from the rolling element, and the pocket edge on the side from which the lubricant exits the pocket is preferably separated from the rolling element with a very small gap.
[0009]
Further, the cage axial view shape of the pocket inner surface is formed in an arc shape projecting in a direction inclined with respect to the radial direction of the cage from the axial view shape of the cage on the rolling element surface accommodated in the pocket. You may be made to do. In addition, an egg shape here means the shape similar to the side view projection shape of a chicken egg. Further, the shape is not limited to an egg shape, and may be a circle or an ellipse.
[0010]
Further, when each of the above-described inventions is applied, the effect can be achieved when the bearing is rotated in a predetermined direction. Therefore, a display for designating the relative rotation direction of the inner ring and the outer ring may be attached. For example, a display indicating the rotation direction or the like may be attached to a place visible from the outside of the bearing. Moreover, you may make it attach | subject an identification symbol to the end surface of an inner ring | wheel or an outer ring | wheel. Further, a pair of sealing plates that are opposed to each other with the rolling element and the cage interposed between the inner ring and the outer ring may be provided, and the pair of sealing plates may be colored differently. Here, the contact plate may be any of a so-called shield type, non-contact seal type, and contact seal type.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a rolling bearing to which the present invention is applied will be described. FIG. 1 is a cross-sectional view showing a state in which the rolling bearing of this embodiment is viewed in the radial direction. As shown in FIG. 1, the bearing 1 is configured as a so-called non-contact seal type single row deep groove ball bearing. The bearing 1 includes an inner ring 3 having a raceway surface formed on the outer peripheral portion, an outer ring 5 that is aligned with the inner ring 3 and having a substantially axial center, a raceway surface formed on the inner peripheral portion, and a raceway surface of the inner ring 3. And a plurality of steel balls 7 which are rolling elements incorporated between the outer ring 5 and the raceway surface. Furthermore, the bearing 1 has a so-called crown-shaped cage 9 that holds a plurality of steel balls 7. A pair of non-contact seals 11 and 13 are provided at intervals between the inner ring 3 and the outer ring 5 with the steel ball 7 and the cage 9 interposed therebetween. Each of the seals 11 and 13 is fixed to the seal groove of the outer ring 5 on the outer diameter side, and the inner diameter side is not in contact with the inner ring 3. The seals 11 and 13 are colored differently.
[0012]
The inner ring 3 is formed with a groove-like raceway surface 15 extending along the circumferential direction at a substantially central portion in the axial direction of the outer circumferential surface. And the so-called shoulder part which is the area | region of both sides which pinched | interposed the raceway surface 15 among the outer peripheral surfaces of the inner ring | wheel 3 is respectively extended along the circumferential direction, and the seal groove which positions the inner peripheral edge part of the seal | stickers 11 and 13 17 and 19 are formed. On the other hand, the outer ring 5 is formed with a groove-like track surface 21 extending along the circumferential direction at a substantially central portion in the axial direction of the inner circumferential surface. And the so-called shoulder part which is the area | region of both sides which pinched | interposed the track surface 21 among the inner peripheral surfaces of the outer ring | wheel 5 each extends along the circumferential direction, and the outer peripheral edge part of the seals 11 and 13 is fixed. Seal grooves 23 and 25 are formed.
[0013]
The cage 9 is configured as a so-called crown-shaped cage. FIG. 2 is an enlarged perspective view of the cage 9 in the present embodiment. As shown in FIG. 2, the cage 9 is provided with an annular portion 27 provided on one side in the axial direction with respect to the steel ball 7, and pockets 31 for accommodating the plurality of steel balls 7 incorporated in the bearing 1, respectively. Are formed at substantially equal intervals in the circumferential direction. The claw portions 29 are provided at both ends in the circumferential direction of a concave portion 33 formed by denting the end surface of the annular portion 27 in an arc shape, and the pockets 31 are formed on the side portions of the concave portion 33 and the claw portion 29 adjacent thereto. And is composed of. The pocket inner surface 35 is continuously formed from the concave portion 33 to the side portion inside the pocket 31 of the claw portion 29. The pocket inner surface 35 is formed as a substantially spherical concave surface, the details of which will be described later. In the present specification, the pocket inner surface 35 and the edges where the inner peripheral surface and the outer peripheral surface of the cage are in contact with each other will be referred to as pocket edges 37 and 39, respectively.
[0014]
FIG. 3 is an enlarged sectional view in the axial direction of the pocket 31 portion in the present embodiment, and is a view showing an operation when the bearing 1 is rotated. FIG. 3 shows an example in which the outer ring 5 is fixed and the inner ring 3 is rotated counterclockwise toward FIG. 3 as an example. Therefore, the steel ball 7 rotates in the clockwise direction toward FIG. 3, and thereby revolves in the counterclockwise direction in FIG. 3. The cage 9 also revolves counterclockwise toward the FIG. 3 as the steel ball 7 revolves. In the present embodiment, as shown in FIG. 3, the pocket edge 37 on the inner peripheral side of the cage 9 is positioned in front of the circumferential direction in the revolution direction of the cage 9 with respect to the pocket edge 39 on the outer circumferential side. A feature is that the phase with respect to the center of the cage 9 is shifted (that is, the pocket edge 37 on the inner peripheral side is shifted counterclockwise in the figure with respect to the pocket edge 39 on the outer peripheral side). To do. And the axial direction cross-sectional shape of the cage | basket 9 of the pocket inner surface 35 protruded to the inner peripheral side of the cage | basket 9, and the revolution direction front with respect to the surface of the steel ball 7 in the revolution direction front of the cage | basket 9. An arc shape included in the arc 41 is formed. On the other hand, in the rearward direction of the cage 9, the cross-sectional shape of the pocket inner surface 35 as viewed in the axial direction of the cage 9 is an arc 43 projecting outward from the surface of the steel ball 7 and rearward in the revolution direction. Are formed in an arc shape.
[0015]
Thus, on the front side in the revolution direction of the cage 9, the pocket inner surface 35 contacts the surface of the steel ball 7 on the pocket edge 39 side on the outer circumferential side of the cage 9, while on the pocket edge 37 side on the inner circumferential side. Faces the surface of the steel ball 7 with a gap. That is, the pocket edge 37 on the entry side where the lubricant adhering to the surface of the steel ball 7 enters the pocket 31 is separated from the surface of the steel ball 7, and the pocket edge 39 on the opposite side is on the surface of the steel ball 7. Touch. And the clearance gap 45 between the pocket inner surface 35 and the surface of the steel ball 7 is comprised so that it may become narrow gradually from the inner peripheral side of the holder | retainer 9 to an outer peripheral side.
[0016]
On the other hand, on the rear side in the revolution direction of the cage 9, the pocket inner surface 35 is separated from the surface of the steel ball 7 on the pocket edge 37 side on the inner circumferential side of the cage 9 with a very small gap, while on the outer circumferential side. On the pocket edge 39 side, it faces the surface of the steel ball 7 with a gap. That is, the pocket edge 39 on the entry side where the lubricant adhering to the surface of the steel ball 7 enters the pocket 31 is separated from the surface of the steel ball 7, and the pocket edge 37 on the opposite side is on the surface of the steel ball 7. Separate with a very small gap. The gap 47 between the pocket inner surface 35 and the surface of the steel ball 7 is configured to gradually narrow from the outer peripheral side to the inner peripheral side of the cage 9. In addition, as shown in FIG. 3, the clearance gap 45 and the clearance gap 47 become the shape like the one end side of a crescent moon in the cage | basket 9 axial view sectional shape.
[0017]
As described above, according to the present embodiment, the lubricating oil adhering to the surface of the steel ball 7 during the rotation of the bearing 1 is not scraped off from the gaps 45 and 47 side to the pocket edges 37 and 39 into the pocket 31. Therefore, the lubrication at the sliding surface portion between the pocket inner surface 35 and the surface of the steel ball 7 becomes good, and the occurrence of stick-slip is reduced. Further, since the steel ball 7 is restrained by the cage 9 by a small amount of movement by the pocket edge 39 on the side in contact with the surface and the pocket edge 37 separated by a very small gap, the occurrence of vibration of the cage 9 is also suppressed. The This has the effect of reducing the cage noise.
[0018]
In addition, since the seals 11 and 13 are colored differently, it is easy to identify the rotation direction in which the above-described effect can be obtained using this color as a mark, and the lubricant is always scraped off by the pocket edges 37 and 39. It is easy to use the bearing 1 in a rotation direction that is difficult to be generated. In order to identify the rotational direction, instead of coloring the seal, an identification symbol may be given to the end face of the inner ring or the outer ring (specifically, for example, engraving is performed).
[0019]
In addition, this invention is not limited to embodiment mentioned above, It can change suitably within the scope of the invention. For example, in the above-described embodiment, the cage is a so-called crown type, but a hollow type or corrugated type cage may be used. Further, the rolling element is not limited to a ball (ball) but may be a roller bearing. In addition, it is possible to appropriately change the shape of the inner ring and the outer ring and the configuration and presence of a sealing plate such as a seal or a shield.
[0020]
Further, in the above-described embodiment, the pocket inner surface is a spherical concave surface, but is not limited thereto, and may be an arbitrary plane or curved surface. For example, the axial sectional shape of the cage may be an arbitrary curve or a straight line, or may be formed in a broken line shape.
[0021]
【The invention's effect】
According to the present invention, the cage noise can be reduced.
[Brief description of the drawings]
FIG. 1 is a radial sectional view of an embodiment of a rolling bearing to which the present invention is applied.
2 is a perspective view of a cage in the bearing of FIG. 1. FIG.
FIG. 3 is an enlarged cross-sectional view of the cage pocket portion in the bearing of FIG. 1 as viewed in the axial direction, showing the operation when the bearing is rotated.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Bearing 3 Inner ring 5 Outer ring 7 Steel ball 9 Cage 11 Seal 13 Seal 15 Track surface 21 Track surface 31 Pocket 35 Pocket inner surface 37 Pocket edge 39 Pocket edge 45 Clearance 47 Clearance

Claims (8)

転動体を収容するためのポケットが周方向に所定の間隔で設けられた保持器であって、該ポケットの内周側のポケットエッジおよび外周側のポケットエッジを、該保持器の周方向に位相をずらして配置したことを特徴とする転がり軸受用保持器。A cage in which pockets for accommodating rolling elements are provided at predetermined intervals in the circumferential direction, and the pocket edge on the inner circumferential side and the pocket edge on the outer circumferential side of the pocket are phased in the circumferential direction of the cage. Roller bearing retainer characterized by being arranged in a shifted manner. 外周部に軌道面が形成されてなる内輪と、内周部に軌道面が形成されてなる外輪と、内輪の軌道面と外輪の軌道面との間に組み込まれた複数の転動体と、転動体を保持する保持器とを有して構成され、保持器には複数の転動体をそれぞれ収容するポケットが形成され、該ポケットの内周側のポケットエッジおよび外周側のポケットエッジを、該保持器の周方向に位相をずらして配置したことを特徴とする転がり軸受。An inner ring having a raceway surface formed on the outer periphery, an outer ring having a raceway surface formed on the inner periphery, a plurality of rolling elements incorporated between the raceway surface of the inner ring and the raceway surface of the outer ring, A pocket for holding a plurality of rolling elements, and the pocket edge on the inner peripheral side and the pocket edge on the outer peripheral side of the pocket are held in the holder. Rolling bearings characterized by being arranged with a phase shifted in the circumferential direction of the vessel. 外周部に軌道面が形成されてなる内輪と、内周部に軌道面が形成されてなる外輪と、内輪の軌道面と外輪の軌道面との間に組み込まれた複数の転動体と、転動体を保持する保持器とを有して構成され、保持器には複数の転動体をそれぞれ収容するポケットが形成され、各ポケットに収容される転動体の中心に対し保持器の周方向一方側においては、保持器の内周側又は外周側何れか一方のポケットエッジは転動体に接しかつ保持器の内周側又は外周側他方のポケットエッジは転動体と離間し、該転動体の中心に対し周方向他方側においては、保持器の前記内周側又は外周側何れか一方のポケットエッジは転動体と離間しかつ保持器の前記内周側又は外周側他方のポケットエッジは転動体と非常に小さい隙間をもって離間することを特徴とする転がり軸受。An inner ring having a raceway surface formed on the outer periphery, an outer ring having a raceway surface formed on the inner periphery, a plurality of rolling elements incorporated between the raceway surface of the inner ring and the raceway surface of the outer ring, A holder for holding a moving body, and the holder is formed with a pocket for storing a plurality of rolling elements, and one side in the circumferential direction of the cage with respect to the center of the rolling element stored in each pocket. In this case, the pocket edge on either the inner peripheral side or outer peripheral side of the cage is in contact with the rolling element, and the other pocket edge on the inner peripheral side or outer peripheral side of the cage is separated from the rolling element, and is located at the center of the rolling element. On the other side in the circumferential direction, the pocket edge on either the inner circumferential side or the outer circumferential side of the cage is separated from the rolling element, and the other pocket edge on the inner circumferential side or the outer circumferential side of the cage is emergency with the rolling element. It is characterized by being separated with a small gap Galli bearing. 内輪と外輪とを所定の方向に相対的に回転させたときに、転動体の表面に付着した潤滑油が、保持器の前記周方向一方側においては、該転動体の自転によってポケットに入る側のポケットエッジは転動体と離間し、該潤滑油がポケットから出る側のポケットエッジは転動体と接し、保持器の前記周方向の他方側においては、該転動体の自転によってポケットに入る側のポケットエッジは転動体と離間し、該潤滑油がポケットから出る側のポケットエッジは、転動体と非常に小さい隙間をもって離間することを特徴とする請求項３に記載の転がり軸受。When the inner ring and the outer ring are relatively rotated in a predetermined direction, the lubricating oil adhering to the surface of the rolling element enters the pocket on one side in the circumferential direction of the cage due to the rotation of the rolling element. The pocket edge of the roller is separated from the rolling element, the pocket edge on the side from which the lubricant exits the pocket is in contact with the rolling element, and the other side in the circumferential direction of the cage is on the side entering the pocket by the rotation of the rolling element. 4. The rolling bearing according to claim 3, wherein the pocket edge is separated from the rolling element, and the pocket edge on the side where the lubricating oil comes out of the pocket is separated from the rolling element with a very small gap. ポケット内面の保持器軸方向視形状が、該ポケット内に収容される転動体表面の保持器の軸方向視形状から、該保持器の径方向に対し傾斜した方向に張り出した弧状に形成されることを特徴とする請求項２乃至４のいずれかに記載の転がり軸受。The shape of the inner surface of the cage in the axial direction of the cage is formed in an arc shape projecting in a direction inclined with respect to the radial direction of the cage from the shape of the cage in the surface of the rolling element accommodated in the pocket. The rolling bearing according to claim 2, wherein the rolling bearing is provided. 内輪と外輪との相対的な回転方向を指定する表示が付されることを特徴とする請求項２乃至５のいずれかに記載の転がり軸受。The rolling bearing according to any one of claims 2 to 5, wherein a display designating a relative rotation direction between the inner ring and the outer ring is attached. 内輪又は外輪の端面に、識別記号が付されていることを特徴とする請求項６に記載の転がり軸受。The rolling bearing according to claim 6, wherein an identification symbol is attached to an end face of the inner ring or the outer ring. 内輪と外輪との間に転動体および保持器を挟んで対向する一対の密封板が設けられ、該一対の密封版にそれぞれ異なった色が着色されていることを特徴とする請求項２乃至７のいずれかに記載の転がり軸受。8. A pair of sealing plates facing each other with a rolling element and a retainer sandwiched between an inner ring and an outer ring, and different colors are colored on the pair of sealed plates, respectively. A rolling bearing according to any one of the above.
JP2003169001A 2003-06-13 2003-06-13 Retainer for rolling bearing and rolling bearing Pending JP2005003145A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7789569B2 (en) 2006-06-20 2010-09-07 Jtekt Corporation Rolling bearing and cage for rolling bearing
CN106917772A (en) * 2015-10-13 2017-07-04 株式会社岛津制作所 Oil-lubricated bearing device and vavuum pump
US9958005B2 (en) * 2015-10-13 2018-05-01 Shimadzu Corporation Oil-lubricated bearing device and vacuum pump

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7789569B2 (en) 2006-06-20 2010-09-07 Jtekt Corporation Rolling bearing and cage for rolling bearing
CN106917772A (en) * 2015-10-13 2017-07-04 株式会社岛津制作所 Oil-lubricated bearing device and vavuum pump
US9958005B2 (en) * 2015-10-13 2018-05-01 Shimadzu Corporation Oil-lubricated bearing device and vacuum pump
CN106917772B (en) * 2015-10-13 2019-02-19 株式会社岛津制作所 Oil-lubricated bearing device and vacuum pump

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