JP7294163B2 - Roller bearing retainer and roller bearing - Google Patents

Roller bearing retainer and roller bearing Download PDF

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JP7294163B2
JP7294163B2 JP2020009144A JP2020009144A JP7294163B2 JP 7294163 B2 JP7294163 B2 JP 7294163B2 JP 2020009144 A JP2020009144 A JP 2020009144A JP 2020009144 A JP2020009144 A JP 2020009144A JP 7294163 B2 JP7294163 B2 JP 7294163B2
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roller bearing
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賢 蜂須賀
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NSK Ltd
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Description

本発明は、例えば、自動車や各種産業機械の回転支持部に用いられるころ軸受用保持器及びころ軸受に関し、特に、トランスミッションの回転支持部に用いられるころ軸受用保持器及びころ軸受に関する。 TECHNICAL FIELD The present invention relates to a roller bearing retainer and a roller bearing used in, for example, a rotation support portion of automobiles and various industrial machines, and more particularly to a roller bearing retainer and roller bearing used in a rotation support portion of a transmission.

従来のころ軸受用保持器として、互いに軸方向に離間配置される一対の円環部と、一対の円環部を軸方向に連結する複数の柱部と、を備え、円周方向に互いに隣り合う各柱部間に針状ころを転動可能に保持するポケットが形成されるものが知られている（例えば、特許文献１参照）。 A conventional roller bearing retainer includes a pair of annular portions spaced apart from each other in the axial direction, and a plurality of pillars connecting the pair of annular portions in the axial direction. It is known that a pocket is formed between the matching pillars to hold the needle rollers so that they can roll (see, for example, Patent Document 1).

従来の他のころ軸受用保持器として、円筒ころの両端面に第１凸状球面及び第２凸状球面が形成され、保持器のポケットの内壁面の四隅に第１凸状球面及び第２凸状球面にそれぞれ点接触する第１～第４接触面（各凸状球面に対して２点で点接触）が形成されるものが知られている（例えば、特許文献２参照）。 As another conventional roller bearing retainer, a first convex spherical surface and a second convex spherical surface are formed on both end surfaces of a cylindrical roller, and a first convex spherical surface and a second convex spherical surface are formed on the four corners of the inner wall surface of a pocket of the cage. It is known that first to fourth contact surfaces (point contact at two points with respect to each convex spherical surface) are formed to make point contact with each convex spherical surface (see, for example, Patent Document 2).

特開２００８－１２８４０４号公報JP 2008-128404 A 特開２０１３－０５３７１３号公報JP 2013-053713 A

近年、自動変速機（ＡＴ）、無段変速機（ＣＶＴ）、ハイブリッド車の変速機などに使用されるプラネタリピニオンでは、小型化、高速化、低トルク化、貧潤滑条件化などが要求されている。従って、高速化に伴い、保持器に掛かる負荷が増加する傾向にあるため、ポケット隅部に高い応力が生じて、柱部が疲労破損することが問題になっていた。 In recent years, planetary pinions used in automatic transmissions (AT), continuously variable transmissions (CVT), hybrid vehicle transmissions, etc. have been required to be smaller, faster, have lower torque, and require less lubrication. there is Therefore, as the speed increases, the load applied to the retainer tends to increase, so that high stress is generated in the pocket corners, and fatigue failure of the pillars has become a problem.

しかしながら、上記特許文献１に記載のころ軸受用保持器では、円環部と柱部との間の境界部分であるポケット隅部が直角形状であるため、軸受高速回転時にポケット隅部に高い応力が生じて、柱部が疲労破損する可能性があった。また、上記特許文献２に記載のころ軸受用保持器では、ポケットの内壁面に形成された各接触面は、円環部及び柱部との境界部分が直角形状であるので、この境界部分に高い応力が発生している。 However, in the roller bearing retainer described in Patent Document 1, since the pocket corner, which is the boundary portion between the annular portion and the column portion, has a right-angled shape, high stress is applied to the pocket corner during high-speed rotation of the bearing. There was a possibility that the column part would suffer fatigue failure. Further, in the roller bearing retainer described in Patent Document 2, each contact surface formed on the inner wall surface of the pocket has a right-angled boundary portion between the annular portion and the column portion. High stress is generated.

本発明は、前述した課題に鑑みてなされたものであり、その目的は、保持器のポケット隅部に生じる応力を軽減して、柱部の疲労破損を防止することができるころ軸受用保持器及びころ軸受を提供することにある。 SUMMARY OF THE INVENTION The present invention has been made in view of the problems described above, and an object of the present invention is to provide a roller bearing retainer capable of reducing the stress generated in the pocket corners of the retainer and preventing the fatigue damage of the columns. and to provide a roller bearing.

本発明の上記目的は、下記の構成により達成される。
（１）同軸に配置される一対の円環部と、前記一対の円環部を軸方向で連結し、周方向に略等間隔に設けられる複数の柱部と、周方向に互いに隣り合う前記柱部及び前記一対の円環部により囲まれて形成され、円筒ころを転動可能に保持するポケットと、を有するころ軸受用保持器であって、前記ポケットの軸方向端面であるポケット端面は、第１曲率半径Ｒ１の凹円弧形状に形成され、前記ポケット端面の周方向端と前記柱部の周方向側面の軸方向外端とを接続する連結面は、第２曲率半径Ｒ２の凹円弧形状に形成され、前記第１曲率半径Ｒ１及び前記第２曲率半径Ｒ２は、Ｒ１＞Ｒ２の関係を満たすように設定され、前記第１曲率半径Ｒ１は、１ｍｍ～１０ｍｍの範囲に設定される、ころ軸受用保持器。
（２）（１）に記載のころ軸受用保持器と、複数の前記円筒ころと、を備えるころ軸受であって、前記円筒ころの軸方向両端面である一対のころ端面は、曲率半径Ｒａの凸球面形状にそれぞれ形成され、前記第１曲率半径Ｒ１及び前記ころ端面の曲率半径Ｒａは、１．１≦（Ｒ１／Ｒａ）≦１．７の関係を満たすように設定される、ころ軸受。 The above objects of the present invention are achieved by the following configurations.
(1) A pair of coaxially arranged circular ring portions, a plurality of column portions connecting the pair of circular ring portions in the axial direction and provided at substantially equal intervals in the circumferential direction, and the A roller bearing retainer having a pocket surrounded by a column portion and the pair of annular portions and holding a cylindrical roller in a rollable manner, wherein the pocket end face, which is the axial end face of the pocket, is , a connecting surface formed in a concave arc shape with a first curvature radius R1, and connecting the circumferential end of the pocket end face and the axial outer end of the circumferential side surface of the column portion is a concave arc with a second curvature radius R2 The first curvature radius R1 and the second curvature radius R2 are set to satisfy the relationship R1>R2, and the first curvature radius R1 is set in the range of 1 mm to 10 mm. Cage for roller bearings.
(2) A roller bearing comprising the roller bearing retainer described in (1) and a plurality of the cylindrical rollers, wherein a pair of roller end faces, which are axial end faces of the cylindrical rollers, have a radius of curvature Ra , wherein the first radius of curvature R1 and the radius of curvature Ra of the roller end surface are set to satisfy the relationship 1.1≦(R1/Ra)≦1.7 .

本発明によれば、ポケットの軸方向端面であるポケット端面は、第１曲率半径Ｒ１の凹円弧形状に形成され、ポケット端面の周方向端と柱部の周方向側面の軸方向外端とを接続する連結面は、第２曲率半径Ｒ２の凹円弧形状に形成され、第１曲率半径Ｒ１及び第２曲率半径Ｒ２は、Ｒ１＞Ｒ２の関係を満たすように設定され、第１曲率半径Ｒ１は、１ｍｍ～１０ｍｍの範囲に設定される。このため、保持器のポケット隅部に生じる応力を軽減して、柱部の疲労破損を防止することができる。 According to the present invention, the pocket end face, which is the axial end face of the pocket, is formed in a concave circular arc shape with the first curvature radius R1, and the circumferential end of the pocket end face and the axial outer end of the circumferential side face of the column portion are connected. The connection surface to be connected is formed in a concave arc shape with a second curvature radius R2, the first curvature radius R1 and the second curvature radius R2 are set to satisfy the relationship R1>R2, and the first curvature radius R1 is , in the range of 1 mm to 10 mm. Therefore, it is possible to reduce the stress generated in the pocket corners of the retainer and prevent the column from fatigue damage.

本発明に係るころ軸受の一実施形態を説明する断面図である。BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing explaining one Embodiment of the roller bearing which concerns on this invention. 図１に示す保持器の拡大斜視図である。FIG. 2 is an enlarged perspective view of the retainer shown in FIG. 1; 図１に示す保持器の展開図である。FIG. 2 is an exploded view of the retainer shown in FIG. 1;

本実施形態の円筒ころ軸受（ころ軸受）１０は、図１に示すように、外輪１１と、内輪１２と、外輪１１と内輪１２との間に転動可能に設けられる複数の円筒ころ１３と、複数の円筒ころ１３を周方向に略等間隔に保持するころ軸受用保持器（以下、単に「保持器」とも言う）１４と、を備える。また、外輪１１はハウジングＨに内嵌され、内輪１２は軸Ａに外嵌されている。なお、円筒ころ軸受１０は、外輪１１及び内輪１２を備えないケージアンドローラ型のころ軸受であってもよい。 As shown in FIG. 1, a cylindrical roller bearing (roller bearing) 10 according to the present embodiment includes an outer ring 11, an inner ring 12, and a plurality of cylindrical rollers 13 rotatably provided between the outer ring 11 and the inner ring 12. , and a roller bearing retainer (hereinafter also simply referred to as “retainer”) 14 that retains a plurality of cylindrical rollers 13 at approximately equal intervals in the circumferential direction. The outer ring 11 is fitted on the housing H, and the inner ring 12 is fitted on the shaft A. The cylindrical roller bearing 10 may be a cage-and-roller type roller bearing that does not include the outer ring 11 and the inner ring 12 .

円筒ころ１３は、円筒ころ１３の周面である円筒状の転動面１３ａと、円筒ころ１３の軸方向両端面である一対のころ端面１３ｂと、を有する。また、本実施形態では、ころ端面１３ｂは、曲率半径Ｒａの凸球面形状に形成されている。上記凸球面の中心は、円筒ころ１３の自転軸上に位置している。なお、ころ端面１３ｂは、平面形状に形成されていてもよい。 The cylindrical roller 13 has a cylindrical rolling contact surface 13 a that is a peripheral surface of the cylindrical roller 13 and a pair of roller end surfaces 13 b that are axial end surfaces of the cylindrical roller 13 . Further, in this embodiment, the roller end surface 13b is formed in a convex spherical shape with a radius of curvature Ra. The center of the convex spherical surface is positioned on the rotation axis of the cylindrical roller 13 . Note that the roller end surface 13b may be formed in a planar shape.

保持器１４は、図１及び図２に示すように、同軸に配置される一対の円環部１５と、一対の円環部１５を軸方向で連結し、周方向に略等間隔に設けられる複数の柱部１６と、周方向に互いに隣り合う柱部１６及び一対の円環部１５により囲まれて形成され、円筒ころ１３を転動可能に保持するポケット１７と、を有する。なお、本実施形態の保持器１４は、金属製の長板部材にフォーミング加工を施すことにより成形されるＭ型保持器であるが、これに限定されず、合成樹脂製の保持器であってもよい。 As shown in FIGS. 1 and 2, the retainer 14 connects a pair of circular ring portions 15 arranged coaxially with each other in the axial direction, and is provided at approximately equal intervals in the circumferential direction. It has a plurality of columns 16 and a pocket 17 surrounded by the columns 16 and the pair of annular portions 15 adjacent to each other in the circumferential direction and holding the cylindrical rollers 13 in a rollable manner. Note that the retainer 14 of the present embodiment is an M-shaped retainer formed by subjecting a metal long plate member to a forming process, but is not limited to this, and may be a synthetic resin retainer. good too.

そして、図２及び図３に示すように、ポケット１７の軸方向端面であるポケット端面１７ａは、第１曲率半径Ｒ１の凹円弧形状に形成されている。ポケット端面１７ａの凹円弧形状の中心は、ポケット１７の周方向中央に位置している。また、ポケット１７のポケット端面１７ａの周方向両端と柱部１６の周方向側面１６ａの軸方向外端とをそれぞれ接続する連結面１８は、第２曲率半径Ｒ２の凹円弧形状にそれぞれ形成されている。また、ポケット端面１７ａと連結面１８は、第１曲率半径Ｒ１を有する凹円弧と第２曲率半径Ｒ２の凹円弧とに接する共通接線を介して、角部がない滑らかな曲面により連続している。同様に、連結面１８と柱部１６の周方向側面１６ａは、角部がない滑らかな曲面により連続している。 As shown in FIGS. 2 and 3, the pocket end face 17a, which is the axial end face of the pocket 17, is formed in a concave circular arc shape with a first curvature radius R1. The center of the concave arc shape of the pocket end face 17a is located at the center of the pocket 17 in the circumferential direction. A connecting surface 18 connecting both circumferential ends of the pocket end surface 17a of the pocket 17 and the axially outer end of the circumferential side surface 16a of the column portion 16 is formed in a concave arc shape having a second radius of curvature R2. there is The pocket end surface 17a and the connecting surface 18 are connected by a smooth curved surface without corners via a common tangent line that contacts the concave arc having the first curvature radius R1 and the concave arc having the second curvature radius R2. . Similarly, the connecting surface 18 and the circumferential side surface 16a of the column portion 16 are continuous with a smooth curved surface without corners.

また、本実施形態では、第１曲率半径Ｒ１は、１ｍｍ～１０ｍｍの範囲に設定されている。また、転動体がニードルころであるニードルころ軸受の場合、第１曲率半径Ｒ１は、１ｍｍ～５ｍｍの範囲に設定されると好ましい。また、本実施形態では、第１曲率半径Ｒ１及び第２曲率半径Ｒ２は、Ｒ１＞Ｒ２の関係を満たすように設定され、好ましくは、０．２Ｒ１≧Ｒ２の関係を満たすように設定されている。 Further, in this embodiment, the first radius of curvature R1 is set within a range of 1 mm to 10 mm. Further, in the case of a needle roller bearing in which the rolling elements are needle rollers, the first radius of curvature R1 is preferably set within a range of 1 mm to 5 mm. Further, in the present embodiment, the first radius of curvature R1 and the second radius of curvature R2 are set so as to satisfy the relationship R1>R2, preferably, so as to satisfy the relationship 0.2R1≧R2. .

また、本実施形態では、第１曲率半径Ｒ１及びころ端面１３ｂの曲率半径Ｒａは、１．１≦（Ｒ１／Ｒａ）≦１．７の関係を満たすように設定され、好ましくは、１．３≦（Ｒ１／Ｒａ）≦１．６の関係を満たすように設定されている。つまり、第１曲率半径Ｒ１は、ころ端面１３ｂの曲率半径Ｒａよりも大きく設定されている。これにより、ポケット端面１７ａところ端面１３ｂが１点での点接触になるため、摩擦抵抗を減らし、軸受トルクを低減することができ、また、保持器１４の耐久性を向上することができる。 In this embodiment, the first radius of curvature R1 and the radius of curvature Ra of the roller end face 13b are set to satisfy the relationship 1.1≤(R1/Ra)≤1.7, preferably 1.3. It is set to satisfy the relationship ≦(R1/Ra)≦1.6. That is, the first curvature radius R1 is set larger than the curvature radius Ra of the roller end face 13b. As a result, since the pocket end face 17a and the roller end face 13b are in point contact at one point, the frictional resistance can be reduced, the bearing torque can be reduced, and the durability of the retainer 14 can be improved.

また、図２及び図３に示すように、柱部１６の周方向側面１６ａの軸方向両端部には、円筒ころ１３がポケット１７の外径側から脱落するのを防止するための突部１９がそれぞれ形成されている。 2 and 3, projections 19 for preventing the cylindrical rollers 13 from falling off from the outer diameter side of the pocket 17 are provided at both axial end portions of the circumferential side surface 16a of the column portion 16. are formed respectively.

以上説明したように、本実施形態の円筒ころ軸受１０によれば、ポケット１７の軸方向端面であるポケット端面１７ａは、第１曲率半径Ｒ１の凹円弧形状に形成され、ポケット１７のポケット端面１７ａの周方向両端と柱部１６の周方向側面１６ａの軸方向外端とをそれぞれ接続する連結面１８は、第２曲率半径Ｒ２の凹円弧形状にそれぞれ形成され、第１曲率半径Ｒ１及び第２曲率半径Ｒ２は、Ｒ１＞Ｒ２の関係を満たすように設定され、第１曲率半径Ｒ１は、１ｍｍ～１０ｍｍの範囲に設定される。そして、ポケット端面１７ａと連結面１８、及び連結面１８と柱部１６の周方向側面１６ａは、それぞれ角部がない滑らかな曲面により連続している。このため、保持器１４のポケット隅部に生じる応力の集中を軽減して、柱部１６の疲労破損を防止することができる。 As described above, according to the cylindrical roller bearing 10 of the present embodiment, the pocket end surface 17a, which is the axial end surface of the pocket 17, is formed in a concave circular arc shape with the first curvature radius R1. and the axially outer end of the circumferential side surface 16a of the column portion 16 are each formed in a concave circular arc shape with a second curvature radius R2. The radius of curvature R2 is set to satisfy the relationship R1>R2, and the first radius of curvature R1 is set in the range of 1 mm to 10 mm. The pocket end surface 17a and the connecting surface 18, and the connecting surface 18 and the circumferential side surface 16a of the column portion 16 are connected by smooth curved surfaces without corners. As a result, the concentration of stress generated in the pocket corners of the retainer 14 can be reduced, and the fatigue damage of the pillars 16 can be prevented.

また、本実施形態の円筒ころ軸受１０によれば、ポケット端面１７ａの第１曲率半径Ｒ１及び円筒ころ１３のころ端面１３ｂの曲率半径Ｒａは、１．１≦（Ｒ１／Ｒａ）≦１．７の関係を満たすように設定される。これにより、ポケット端面１７ａところ端面１３ｂが点接触になるため、摩擦抵抗を減らし、軸受トルクを低減することができ、また、保持器１４の耐久性を向上することができる。 Further, according to the cylindrical roller bearing 10 of the present embodiment, the first radius of curvature R1 of the pocket end surface 17a and the radius of curvature Ra of the roller end surface 13b of the cylindrical roller 13 are 1.1≤(R1/Ra)≤1.7. is set so as to satisfy the relationship of As a result, since the pocket end face 17a and the roller end face 13b are in point contact, the frictional resistance can be reduced, the bearing torque can be reduced, and the durability of the retainer 14 can be improved.

なお、本発明は、上記実施形態に例示したものに限定されるものではなく、本発明の要旨を逸脱しない範囲において適宜変更可能である。
例えば、本実施形態では、本発明を円筒ころ軸受に適用する場合を例示したが、これに限定されず、針状ころ軸受や棒状ころ軸受などに本発明を適用してもよい。 It should be noted that the present invention is not limited to those illustrated in the above embodiments, and can be modified as appropriate without departing from the gist of the present invention.
For example, in the present embodiment, the case of applying the present invention to a cylindrical roller bearing was illustrated, but the present invention is not limited to this, and may be applied to a needle roller bearing, a bar roller bearing, or the like.

１０ 円筒ころ軸受
１１ 外輪
１２ 内輪
１３ 円筒ころ
１３ａ 転動面
１３ｂ ころ端面
１４ ころ軸受用保持器
１５ 円環部
１６ 柱部
１６ａ 周方向側面
１７ ポケット
１７ａ ポケット端面
１８ 連結面
１９ 突部
Ｒ１ 第１曲率半径
Ｒ２ 第２曲率半径
Ｒａ ころ端面の曲率半径 REFERENCE SIGNS LIST 10 Cylindrical roller bearing 11 Outer ring 12 Inner ring 13 Cylindrical roller 13a Rolling surface 13b Roller end surface 14 Roller bearing retainer 15 Annular portion 16 Column portion 16a Circumferential side surface 17 Pocket 17a Pocket end surface 18 Connecting surface 19 Projection R1 First curvature Radius R2 Second radius of curvature Ra Radius of curvature of roller end face

Claims (3)

同軸に配置される一対の円環部と、前記一対の円環部を軸方向で連結し、周方向に略等間隔に設けられる複数の柱部と、周方向に互いに隣り合う前記柱部及び前記一対の円環部により囲まれて形成され、円筒ころを転動可能に保持するポケットと、を有するころ軸受用保持器であって、
前記ポケットの軸方向端面であるポケット端面は、第１曲率半径Ｒ１の凹円弧形状に形成され、
前記ポケット端面の周方向端と前記柱部の周方向側面の軸方向外端とを接続する連結面は、第２曲率半径Ｒ２の凹円弧形状に形成され、
前記第１曲率半径Ｒ１及び前記第２曲率半径Ｒ２は、Ｒ１＞Ｒ２の関係を満たすように設定された
ころ軸受用保持器。 A pair of coaxially arranged circular ring portions, a plurality of column portions connecting the pair of circular ring portions in the axial direction and provided at substantially equal intervals in the circumferential direction, the column portions adjacent to each other in the circumferential direction, and A roller bearing retainer having a pocket formed by being surrounded by the pair of annular portions and rotatably retaining the cylindrical roller,
A pocket end face, which is an axial end face of the pocket, is formed in a concave arc shape with a first curvature radius R1,
A connection surface that connects the circumferential end of the pocket end surface and the axially outer end of the circumferential side surface of the column portion is formed in a concave arc shape with a second curvature radius R2,
The first curvature radius R1 and the second curvature radius R2 are set to satisfy the relationship R1>R2
Cage for roller bearings. 前記第１曲率半径Ｒ１は、１ｍｍ～１０ｍｍの範囲に設定される The first curvature radius R1 is set in the range of 1 mm to 10 mm
請求項１に記載のころ軸受用保持器。 The roller bearing retainer according to claim 1. 請求項１又は２に記載のころ軸受用保持器と、複数の前記円筒ころと、を備えるころ軸受であって、
前記円筒ころの軸方向両端面である一対のころ端面は、曲率半径Ｒａの凸球面形状にそれぞれ形成され、
前記第１曲率半径Ｒ１及び前記ころ端面の曲率半径Ｒａは、１．１≦（Ｒ１／Ｒａ）≦１．７の関係を満たすように設定される、ころ軸受。 A roller bearing comprising the roller bearing retainer according to claim 1 or 2 and a plurality of the cylindrical rollers,
A pair of roller end faces, which are both end faces in the axial direction of the cylindrical roller, are each formed in a convex spherical shape with a radius of curvature Ra,
A roller bearing, wherein the first radius of curvature R1 and the radius of curvature Ra of the roller end face are set to satisfy a relationship of 1.1≦(R1/Ra)≦1.7.
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JP2550534Y2 (en) * 1991-07-04 1997-10-15 光洋精工株式会社 Roller bearing cage
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