JP2018128090A

JP2018128090A - Rolling bearing

Info

Publication number: JP2018128090A
Application number: JP2017022045A
Authority: JP
Inventors: 隼人川口; Hayato Kawaguchi
Original assignee: NTN Corp; NTN Toyo Bearing Co Ltd
Current assignee: NTN Corp
Priority date: 2017-02-09
Filing date: 2017-02-09
Publication date: 2018-08-16

Abstract

PROBLEM TO BE SOLVED: To improve attaching workability to a housing or a rotation shaft while preventing creep.SOLUTION: A plurality of balls 3 is retained between an outer ring 1 and an inner ring 2 by a retainer 4 while having intervals in a circumferential direction therebetween. A step part 7 oriented inward in a radial direction is provided between an outer peripheral surface 1a of the outer ring 1 and an end face 1b of the outer ring 1. A peripheral groove 8 is provided on an outer peripheral surface of the step part 7 and an annular elastic member 5 retained while being fitted into the peripheral groove 8 is provided. The elastic member 5 has an axial direction width dimension that is larger than an axial direction dimension of the step part 7.SELECTED DRAWING: Figure 1

Description

本発明は、自動車等のトランスミッションケース内に組み込まれるインプットシャフトやカウンターシャフトを回転可能に支持する転がり軸受に関する。 The present invention relates to a rolling bearing that rotatably supports an input shaft and a countershaft incorporated in a transmission case of an automobile or the like.

自動車のトランスミッションケース内に組み込まれるインプットシャフトやカウンターシャフト（以下、単に「シャフト」という）を回転可能に支持するために転がり軸受が使用される。この転がり軸受は、外輪がトランスミッションケースに一体化されたハウジングの内周に径方向にわずかなすき間をもって嵌合され、内輪がシャフトの外周に径方向にわずかなすき間をもって嵌合されている。 Rolling bearings are used to rotatably support an input shaft and a counter shaft (hereinafter simply referred to as “shaft”) incorporated in a transmission case of an automobile. In this rolling bearing, the outer ring is fitted to the inner circumference of the housing integrated with the transmission case with a slight gap in the radial direction, and the inner ring is fitted to the outer circumference of the shaft with a little gap in the radial direction.

上記転がり軸受は、ハウジングの内周と外輪との間、およびシャフトの外周と内輪との間とにそれぞれ径方向にすき間がある。このため、内輪が回転する場合は、外輪が供回りし、外輪とハウジングとの間で周方向への相対的なずれ（以下、「クリープ」という）が生じることがある。外輪が回転する場合には、内輪が供回りし、内輪とシャフトとの間でクリープが生ずることがある。 The rolling bearing has a gap in the radial direction between the inner periphery and the outer ring of the housing and between the outer periphery of the shaft and the inner ring. For this reason, when the inner ring rotates, the outer ring rotates and relative displacement in the circumferential direction (hereinafter referred to as “creep”) may occur between the outer ring and the housing. When the outer ring rotates, the inner ring rotates and creep may occur between the inner ring and the shaft.

このような問題を解決するために、特許文献１に記載された転がり軸受が知られている。特許文献１に記載された転がり軸受としては、外輪がハウジングの突出部とハウジングの嵌合溝に嵌合されたＣリングとの間で軸方向に位置決めされ、内輪が回転軸の段部と回転軸の嵌合溝に嵌合されたＣリングとの間で軸方向に位置決めされたものである。 In order to solve such a problem, a rolling bearing described in Patent Document 1 is known. In the rolling bearing described in Patent Document 1, the outer ring is positioned in the axial direction between the protruding part of the housing and the C-ring fitted in the fitting groove of the housing, and the inner ring rotates with the step part of the rotating shaft. It is positioned in the axial direction with the C-ring fitted in the fitting groove of the shaft.

そして、ハウジングの突出部と、外輪の外周面の軸方向一端に形成された面取り部との間にリング状の弾性部材が配置され、回転軸の段部と、内輪の内周部の軸方向一端に形成された面取り部との間にリング状の弾性部材が配置されている。 A ring-shaped elastic member is disposed between the protruding portion of the housing and a chamfered portion formed at one end in the axial direction of the outer peripheral surface of the outer ring, and the axial direction of the step portion of the rotating shaft and the inner peripheral portion of the inner ring A ring-shaped elastic member is disposed between the chamfered portion formed at one end.

特許文献１に記載された転がり軸受は、リング状の弾性部材により、外輪とハウジングとの間、および内輪と回転軸との間の相対回転を抑えることができる。 The rolling bearing described in Patent Document 1 can suppress relative rotation between the outer ring and the housing and between the inner ring and the rotating shaft by the ring-shaped elastic member.

特開２０１３−００２４６５号公報JP 2013-002465 A

ところで、特許文献１に記載された転がり軸受では、リング状の弾性部材を外輪の面取り部や内輪の面取り部で保持することができない。このため、あらかじめ、リング状の弾性部材をハウジングの内周と回転軸の外周に配置し、転がり軸受を軸方向に挿入する必要ある。このため、ハウジングおよび回転軸への転がり軸受の取り付けの作業性が悪くなることがある。 By the way, in the rolling bearing described in Patent Document 1, the ring-shaped elastic member cannot be held by the chamfered portion of the outer ring or the chamfered portion of the inner ring. For this reason, it is necessary to arrange a ring-shaped elastic member in advance on the inner periphery of the housing and the outer periphery of the rotary shaft, and to insert the rolling bearing in the axial direction. For this reason, workability | operativity of attachment of the rolling bearing to a housing and a rotating shaft may worsen.

そこで、この発明の課題は、クリープを防止しつつ、ハウジングや回転軸への取り付け作業性を向上させた転がり軸受を提供することである。 SUMMARY OF THE INVENTION An object of the present invention is to provide a rolling bearing that improves the workability of mounting to a housing or a rotating shaft while preventing creep.

上記の課題を解決するために、この発明は、外輪と、前記外輪の径方向内側に配置される内輪と、前記外輪と前記内輪との間に複数配置される転動体と、前記複数の転動体を周方向に間隔をおいて保持する保持器とを備え、前記外輪の外周面と前記外輪の軸方向一方の端面との間、または前記内輪の外周面とその内輪の軸方向一方の端面との間に設けられる径方向内向きの段差部を有し、前記段差部の径方向外周に巻き付けられた状態で保持される環状の弾性部材を備え、前記弾性部材が前記段差部の軸方向寸法よりも大きい軸方向の幅寸法を有する構成を採用することができる。 In order to solve the above-described problems, the present invention includes an outer ring, an inner ring disposed radially inward of the outer ring, a plurality of rolling elements disposed between the outer ring and the inner ring, and the plurality of rolling elements. A retainer that holds the moving body at intervals in the circumferential direction, and between the outer circumferential surface of the outer ring and one axial end surface of the outer ring, or the outer circumferential surface of the inner ring and one axial end surface of the inner ring. And an annular elastic member held in a state of being wound around the radial outer periphery of the stepped portion, the elastic member being in the axial direction of the stepped portion A configuration having an axial width dimension larger than the dimension can be employed.

この構成によると、環状の弾性部材が外輪の外周面または内輪の外周面に設けられる段差部に保持される。このため、弾性部材をハウジングの内周や回転軸の外周に予め配置させる必要がなく、ハウジングや回転軸への転がり軸受の取り付けが容易になる。 According to this configuration, the annular elastic member is held by the step portion provided on the outer peripheral surface of the outer ring or the outer peripheral surface of the inner ring. For this reason, it is not necessary to arrange the elastic member in advance on the inner periphery of the housing or the outer periphery of the rotating shaft, and the mounting of the rolling bearing on the housing or the rotating shaft becomes easy.

ハウジングの内周に突出部が設けられた場合、ハウジングの内周に外輪が嵌合されて、ハウジングの突出部に外輪の軸方向一方の端面が突き当たると、環状の弾性部材がハウジングの突出部により押し潰される。 When the protrusion is provided on the inner periphery of the housing, when the outer ring is fitted to the inner periphery of the housing and one end surface in the axial direction of the outer ring comes into contact with the protrusion of the housing, the annular elastic member becomes the protrusion of the housing. It is crushed by.

回転軸の外周に段部が設けられた場合では、回転軸の外周に内輪が嵌合されて、回転軸の段部に内輪の軸方向一方の端面が突き当たると、環状の弾性部材が回転軸の段部により押し潰される。 In the case where a step portion is provided on the outer periphery of the rotating shaft, when the inner ring is fitted to the outer periphery of the rotating shaft and one end surface of the inner ring in the axial direction hits the step portion of the rotating shaft, the annular elastic member is moved to the rotating shaft. It is crushed by the step.

上記構成において、前記段差部の外周面に前記弾性部材の係合する周溝を有する構成を採用すると、弾性部材は、外輪の段差部または内輪の段差部の径方向外周に巻き付けられ、周溝に係合する状態で保持される。 In the above configuration, when a configuration having a circumferential groove that engages with the elastic member on the outer peripheral surface of the stepped portion is adopted, the elastic member is wound around the radial outer periphery of the stepped portion of the outer ring or the stepped portion of the inner ring. Is held in a state of being engaged.

この構成において、前記段差部が前記外輪の外周面に設けられており、前記周溝が前記段差部の軸方向内側に位置し、前記弾性部材が前記周溝に嵌合する係合突部を有する構成を採用することができる。この場合、段差部の周溝に弾性部材の係合突部が嵌合することにより、段差部から軸方向外向きへの弾性部材の脱落を防止することができる。 In this configuration, the stepped portion is provided on the outer peripheral surface of the outer ring, the circumferential groove is located on the inner side in the axial direction of the stepped portion, and the engaging protrusion that the elastic member fits into the circumferential groove is provided. The structure which has can be employ | adopted. In this case, the elastic protrusion of the elastic member is fitted into the circumferential groove of the stepped portion, so that the elastic member can be prevented from falling off from the stepped portion in the axially outward direction.

前記弾性部材が軸方向の外側面に軸方向外向きに突出する突起部を有し、その突起部が周方向に複数配置されている構成を採用することができる。 It is possible to adopt a configuration in which the elastic member has a protruding portion that protrudes outward in the axial direction on the outer side surface in the axial direction, and a plurality of the protruding portions are arranged in the circumferential direction.

この場合、弾性部材のうち、段差部から軸方向外側にはみ出した部分のみならず、弾性部材の突起部がハウジングの突出部や回転軸の段部により押し潰される。このため、外輪とハウジングとの間または内輪と回転軸との間の摩擦抵抗をさらに大きくすることができる。 In this case, not only the portion of the elastic member that protrudes outward in the axial direction from the stepped portion, but also the protruding portion of the elastic member is crushed by the protruding portion of the housing and the step portion of the rotating shaft. For this reason, the frictional resistance between the outer ring and the housing or between the inner ring and the rotating shaft can be further increased.

また、前記弾性部材の係合突部が全周にわたって形成されている構成や、前記弾性部材の係合突部が周方向に間隔をおいて複数配置されている構成を採用することができる。 Moreover, the structure by which the engagement protrusion part of the said elastic member is formed over the perimeter, and the structure by which the engagement protrusion part of the said elastic member is arrange | positioned at intervals in the circumferential direction are employable.

この発明は、外輪または内輪の段差部にその径方向外周に巻き付けられた環状の弾性部材を保持することができるので、転がり軸受をハウジングや回転軸に容易に取り付けることができる。 According to the present invention, since the annular elastic member wound around the outer periphery in the radial direction can be held on the step portion of the outer ring or the inner ring, the rolling bearing can be easily attached to the housing or the rotating shaft.

また、環状の弾性部材により、外輪とハウジングとの間、内輪と回転軸との間に摩擦抵抗が生じ、上述したクリープを防止することができる。 Further, the annular elastic member causes a frictional resistance between the outer ring and the housing, and between the inner ring and the rotating shaft, thereby preventing the above-described creep.

この発明の第一の実施形態に係る転がり軸受を示す縦断面図The longitudinal cross-sectional view which shows the rolling bearing which concerns on 1st embodiment of this invention 弾性部材を取り付けた外輪を示す拡大縦断面図Enlarged longitudinal sectional view showing an outer ring with an elastic member attached 転がり軸受をハウジングに嵌合した状態を示す縦断面図Longitudinal sectional view showing the rolling bearing fitted in the housing 転がり軸受をハウジングに嵌合した状態を示す拡大縦断面図Enlarged longitudinal sectional view showing a state in which the rolling bearing is fitted to the housing この発明の第二の実施形態に係る転がり軸受を示す縦断面図A longitudinal sectional view showing a rolling bearing according to a second embodiment of this invention 弾性部材を取り付けた外輪を示す拡大縦断面図Enlarged longitudinal sectional view showing an outer ring with an elastic member attached 転がり軸受をハウジングに嵌合した状態を示す拡大縦断面図Enlarged longitudinal sectional view showing a state in which the rolling bearing is fitted to the housing （ａ）弾性部材を示す斜視図、（ｂ）弾性部材の一部を示す切り欠き斜視図(A) Perspective view showing elastic member, (b) Notched perspective view showing part of elastic member （ａ）弾性部材の他の形態を示す斜視図、（ｂ）弾性部材の一部を示す切り欠き斜視図(A) The perspective view which shows the other form of an elastic member, (b) The notch perspective view which shows a part of elastic member （ａ）弾性部材のさらに他の形態を示す斜視図、（ｂ）弾性部材の一部を示す切り欠き斜視図(A) The perspective view which shows the other form of an elastic member, (b) The notch perspective view which shows a part of elastic member この発明の第三の実施形態に係る転がり軸受を示す縦断面図The longitudinal cross-sectional view which shows the rolling bearing which concerns on 3rd embodiment of this invention 弾性部材を取り付けた内輪を示す拡大縦断面図Enlarged longitudinal sectional view showing an inner ring with an elastic member attached 転がり軸受をハウジングに嵌合した状態を示す縦断面図Longitudinal sectional view showing the rolling bearing fitted in the housing 転がり軸受をハウジングに嵌合した状態を示す拡大縦断面図Enlarged longitudinal sectional view showing a state in which the rolling bearing is fitted to the housing

以下、この発明の実施形態を図面に基づいて説明する。この発明の第一の実施形態の転がり軸受２０は、クランクケース（トランスミッションケース）（図示省略）内に組み込まれるインプットシャフトやカウンターシャフト（以下、単に、シャフト４０という）を回転可能に支持し、クランクケースに一体化したハウジング３０内に嵌合されている。ハウジング３０と、ハウジング３０に嵌合される転がり軸受２０と、転がり軸受２０の内周に嵌合されるシャフト４０とで、転がり軸受装置が構成される。なお、以下の説明では、転がり軸受２０の中心軸に沿った方向を「軸方向」、中心軸に直交する方向を「径方向」、中心軸を中心とする円弧に沿う方向を「周方向」と呼ぶ。 Embodiments of the present invention will be described below with reference to the drawings. The rolling bearing 20 according to the first embodiment of the present invention rotatably supports an input shaft and a countershaft (hereinafter simply referred to as a shaft 40) incorporated in a crankcase (transmission case) (not shown). The housing 30 is integrated with the case. The rolling bearing device is configured by the housing 30, the rolling bearing 20 fitted to the housing 30, and the shaft 40 fitted to the inner periphery of the rolling bearing 20. In the following description, the direction along the central axis of the rolling bearing 20 is “axial direction”, the direction orthogonal to the central axis is “radial direction”, and the direction along the arc centered on the central axis is “circumferential direction”. Call it.

この実施形態の転がり軸受２０は、図１に示すように、外周面１ａと軸方向一方の端面１ｂと間に設けられた径方向内向きの段差部７を有する外輪１と、外輪１の径方向内側に同軸上に配置される内輪２と、外輪１と内輪２との間に転動可能に複数配置される転動体としての玉３と、複数の玉３を周方向に間隔をおいて保持する保持器４を備えている。すなわち、本実施形態では、転がり軸受２０は、玉軸受である。 As shown in FIG. 1, the rolling bearing 20 of this embodiment includes an outer ring 1 having a radially inward stepped portion 7 provided between an outer peripheral surface 1 a and one axial end surface 1 b, and a diameter of the outer ring 1. An inner ring 2 that is coaxially arranged on the inner side in the direction, a ball 3 that is a plurality of rolling elements that can be rolled between the outer ring 1 and the inner ring 2, and a plurality of balls 3 that are spaced apart in the circumferential direction. A retainer 4 for retaining is provided. That is, in this embodiment, the rolling bearing 20 is a ball bearing.

この転がり軸受２０は、外輪１の段差部７の径方向外周にこれを締め付ける状態で巻き付けられる環状の弾性部材５を備えている。 The rolling bearing 20 includes an annular elastic member 5 that is wound around the radial outer periphery of the stepped portion 7 of the outer ring 1 in a state in which the stepped portion 7 is tightened.

外輪１は、内周の軸方向中央に軌道面６を有しており、軌道面６は径方向の断面形状が円弧状となるものである。外輪１の外周面１ａに面取りが軸方向の両側に施されている。 The outer ring 1 has a raceway surface 6 in the center of the inner circumference in the axial direction, and the raceway surface 6 has a circular cross-sectional shape in the radial direction. The outer ring 1 is chamfered on both sides in the axial direction on the outer peripheral surface 1a.

外輪１の段差部７は、図２に示すように、外輪１の外周面１ａの軸方向一方の端部に位置しており、軸方向外側を向く側面７ａと径方向外側を臨む外周面７ｂとを有している。 As shown in FIG. 2, the step portion 7 of the outer ring 1 is located at one end in the axial direction of the outer peripheral surface 1 a of the outer ring 1, and has a side surface 7 a facing outward in the axial direction and an outer peripheral surface 7 b facing outward in the radial direction. And have.

側面７ａは、外輪１の端面１ｂに対して平行であり、全周にわたり外輪１の外周面１ａから径方向に一定幅をもって形成されている。外周面７ｂは、その径方向の断面形状が、側面７ａの径方向内縁から軸方向外側に向かって径方向内向きに傾斜している。 The side surface 7a is parallel to the end surface 1b of the outer ring 1, and is formed with a constant width in the radial direction from the outer peripheral surface 1a of the outer ring 1 over the entire circumference. The outer peripheral surface 7b has a radial cross-sectional shape inclined inward in the radial direction from the radial inner edge of the side surface 7a toward the outer side in the axial direction.

外周面７ｂは、その軸方向外側寄りの位置に径方向内向きに凹む周溝８を有する。周溝８は、溝底面８ａと、溝底面８ａの軸方向内側に位置する第一溝側面８ｂと、溝底面８ａの軸方向外側に位置する第二溝側面８ｃとを有している。 The outer peripheral surface 7b has a circumferential groove 8 that is recessed radially inward at a position closer to the outer side in the axial direction. The circumferential groove 8 has a groove bottom surface 8a, a first groove side surface 8b located on the inner side in the axial direction of the groove bottom surface 8a, and a second groove side surface 8c located on the outer side in the axial direction of the groove bottom surface 8a.

第一溝側面８ｂは、その径方向の断面形状が段差部７の外周面７ｂと同一平面上に連続して軸方向外側に向かって径方向内向きに傾斜するものである。第二溝側面８ｃは、その径方向の断面形状が軸方向外側に向かって径方向外向きに傾斜し、外輪１の端面１ｂの径方向外縁に達している。 The first groove side surface 8b has a radial cross-sectional shape that is continuously on the same plane as the outer peripheral surface 7b of the stepped portion 7 and is inclined radially inward toward the axially outer side. The second groove side surface 8 c has a radial cross-sectional shape that is inclined radially outward toward the axially outer side and reaches the radial outer edge of the end surface 1 b of the outer ring 1.

溝底面８ａは、円筒面であり、その外径寸法ｄ１が第二溝側面８ｃの軸方向外縁（外輪１の端面１ｂの径方向外縁）の外径寸法ｄ２よりも小さく形成されている。 The groove bottom surface 8a is a cylindrical surface, and its outer diameter dimension d1 is formed smaller than the outer diameter dimension d2 of the axial outer edge of the second groove side surface 8c (the radial outer edge of the end surface 1b of the outer ring 1).

内輪２は、外周面の軸方向中央に軌道面９を有しており、軌道面９は径方向の断面形状が円弧状をなしている。玉３は、球状であり、外輪１の軌道面６と内輪２の軌道面９との間に転動可能に複数配置されている。それぞれの玉３は、保持器４により周方向に間隔をおいて保持されている。 The inner ring 2 has a raceway surface 9 in the center of the outer peripheral surface in the axial direction, and the raceway surface 9 has a circular cross-sectional shape in the radial direction. The balls 3 are spherical, and a plurality of balls 3 are arranged between the raceway surface 6 of the outer ring 1 and the raceway surface 9 of the inner ring 2 so as to be able to roll. Each ball 3 is held by a cage 4 at intervals in the circumferential direction.

保持器４は、円環状のリム部４ａと、リム部４ａの軸方向の他方側端面に周方向に所定の間隔をおいて複数配置され、軸方向他方に延びる柱部４ｂとを有している。隣り合う柱部４ｂの間には玉３を転動可能に保持するポケットが形成されている。 The cage 4 has an annular rim portion 4a and a plurality of pillar portions 4b that are arranged on the other end surface in the axial direction of the rim portion 4a at predetermined intervals in the circumferential direction and extend in the other axial direction. Yes. A pocket for holding the ball 3 in a rollable manner is formed between the adjacent pillar portions 4b.

弾性部材５は、弾性を有する断面円形の円環体であって、弾性変形していない自然状態での内径寸法ｄ３が周溝８の溝底面８ａの外径寸法ｄ１よりも小さく形成されている（図２中の二点鎖線参照）。このため、弾性部材５が段差部７の外周面７ｂに装着されると、弾性部材５は周溝８に嵌り込むとともに、第一溝側面８ｂおよび第二溝側面８ｃを締め付ける状態となる。 The elastic member 5 is an annular member having a circular cross section having elasticity, and is formed such that the inner diameter dimension d3 in a natural state where the elastic member 5 is not elastically deformed is smaller than the outer diameter dimension d1 of the groove bottom surface 8a of the circumferential groove 8. (See the two-dot chain line in FIG. 2). For this reason, when the elastic member 5 is mounted on the outer peripheral surface 7b of the stepped portion 7, the elastic member 5 is fitted into the circumferential groove 8, and the first groove side surface 8b and the second groove side surface 8c are tightened.

また、弾性部材５は、弾性変形していない自然状態での径方向断面における直径ｄ４（転がり軸受２０での軸方向の幅寸法）が段差部７の側面７ａと外輪１の端面１ｂとの間の軸方向寸法Ｌよりも大きく形成されている。さらに、弾性部材５は、段差部７の外周面７ｂに装着されて周溝８に嵌り込む状態において、外輪１の段差部７の側面７ａに対して非接触状態となっている。 Further, the elastic member 5 has a diameter d4 (a width dimension in the axial direction of the rolling bearing 20) in a radial cross section in a natural state that is not elastically deformed between the side surface 7a of the stepped portion 7 and the end surface 1b of the outer ring 1. It is formed larger than the axial dimension L. Further, the elastic member 5 is in a non-contact state with respect to the side surface 7 a of the stepped portion 7 of the outer ring 1 in a state where the elastic member 5 is mounted on the outer peripheral surface 7 b of the stepped portion 7 and fitted into the circumferential groove 8.

弾性部材５の材質としては、ポリウレタン樹脂、ネオプレンゴム、ポリウレタンゴム、シリコーンゴム、ポリエステルエラストマー、クロロプレンゴム、ニトリルゴム等の適度な硬度を有する弾性体等が使用できる。 As the material of the elastic member 5, an elastic body having an appropriate hardness such as polyurethane resin, neoprene rubber, polyurethane rubber, silicone rubber, polyester elastomer, chloroprene rubber, nitrile rubber, or the like can be used.

第一の実施形態に係る転がり軸受２０は、以上のようなものであり、自動車等のクランクケース内に組み込まれたシャフト４０を回転可能に支持する。クランクケースにはハウジング３０が一体化されており、図３に示すように、ハウジング３０の内周部に径方向内向きの突出部３１が設けられている。シャフト４０の外周面には径方向外向きの段部４１が設けられている。 The rolling bearing 20 according to the first embodiment is as described above, and rotatably supports the shaft 40 incorporated in a crankcase of an automobile or the like. A housing 30 is integrated with the crankcase, and as shown in FIG. 3, a radially inward protruding portion 31 is provided on the inner peripheral portion of the housing 30. A radially outward step portion 41 is provided on the outer peripheral surface of the shaft 40.

転がり軸受２０は、ハウジング３０の内周部への嵌合の際、段差部７の外周面７ｂに弾性部材５を巻き付ける。弾性部材５は、その復元弾性力により、周溝８の第一溝側面８ｂおよび第二溝側面８ｃを押し付けるように周溝８内に嵌り込む。 The rolling bearing 20 wraps the elastic member 5 around the outer peripheral surface 7 b of the stepped portion 7 when fitting to the inner peripheral portion of the housing 30. The elastic member 5 is fitted into the circumferential groove 8 so as to press the first groove side surface 8b and the second groove side surface 8c of the circumferential groove 8 by its restoring elastic force.

ここで、周溝８の第二溝側面８ｃは軸方向外側に向かって径方向外向きに傾斜していることから、弾性部材５は周溝８内に嵌り込んだ状態で段差部７に保持される。 Here, since the second groove side surface 8 c of the circumferential groove 8 is inclined radially outwardly toward the outer side in the axial direction, the elastic member 5 is held in the stepped portion 7 while being fitted in the circumferential groove 8. Is done.

弾性部材５が段差部７に保持された状態で、転がり軸受２０の外輪１がハウジング３０の内周にすき間はめにより嵌合され、内輪２がシャフト４０の外周に径方向にすき間はめにより嵌合される。 With the elastic member 5 held by the stepped portion 7, the outer ring 1 of the rolling bearing 20 is fitted to the inner circumference of the housing 30 by a gap fit, and the inner ring 2 is fitted to the outer circumference of the shaft 40 by a gap fit in the radial direction. Is done.

転がり軸受２０は、弾性部材５を段差部７の周溝８内に保持した状態で、転がり軸受２０をハウジング３０の内周部に取り付けることができる。このため、転がり軸受２０のハウジング３０の内周部への取り付け作業性が向上する。また、周溝８内に保持された弾性部材５は、周溝８内から軸方向外側への脱落が防止される。 The rolling bearing 20 can be attached to the inner peripheral portion of the housing 30 with the elastic member 5 held in the peripheral groove 8 of the stepped portion 7. For this reason, the workability of attaching the rolling bearing 20 to the inner peripheral portion of the housing 30 is improved. Further, the elastic member 5 held in the circumferential groove 8 is prevented from falling off from the circumferential groove 8 to the outside in the axial direction.

また、転がり軸受２０は、ハウジング３０の突出部３１とシャフト４０の段部４１とにより軸方向に位置決めされる。 In addition, the rolling bearing 20 is positioned in the axial direction by the protruding portion 31 of the housing 30 and the step portion 41 of the shaft 40.

軸方向に位置決めされた転がり軸受２０は、外輪１の端面１ｂがハウジング３０の突出部３１に突き合わされた状態となる。ここで、弾性部材５は、上記直径ｄ４が段差部７の側面７ａと外輪１の端面１ｂとの軸方向寸法Ｌよりも大きく形成されている。 The rolling bearing 20 positioned in the axial direction is in a state in which the end surface 1 b of the outer ring 1 is abutted against the protruding portion 31 of the housing 30. Here, the elastic member 5 is formed so that the diameter d4 is larger than the axial dimension L between the side surface 7a of the stepped portion 7 and the end surface 1b of the outer ring 1.

このため、図４に示すように、弾性部材５は、ハウジング３０の突出部３１と段差部７の側面７ａとの間で軸方向に押し潰された状態となる。軸方向に押し潰された弾性部材５は、ハウジング３０の突出部３１を軸方向に押し付ける向きに弾性復元しようとする。 For this reason, as shown in FIG. 4, the elastic member 5 is crushed in the axial direction between the protruding portion 31 of the housing 30 and the side surface 7 a of the stepped portion 7. The elastic member 5 crushed in the axial direction tends to be elastically restored in a direction in which the protruding portion 31 of the housing 30 is pressed in the axial direction.

この弾性部材５により、外輪１は、ハウジング３０に対して摩擦抵抗が生じ、転がり軸受２０とハウジング３０の間のクリープを防止することができる。 The elastic member 5 causes the outer ring 1 to have a frictional resistance with respect to the housing 30, thereby preventing creep between the rolling bearing 20 and the housing 30.

次に、この発明の第二の実施形態に係る転がり軸受を図５〜１０に基づいて説明する。この実施形態の転がり軸受２０は、外輪１の段差部７が軸方向内側に周溝８を有する点、弾性部材５が周溝８に係合する係合突部５ｂを有する点で上述した第一の実施形態の転がり軸受と相違する。その他の構造は、第一の実施形態と同じと考えられ、同じ符号を付してその説明を説明する。 Next, the rolling bearing which concerns on 2nd embodiment of this invention is demonstrated based on FIGS. In the rolling bearing 20 of this embodiment, the step portion 7 of the outer ring 1 has a circumferential groove 8 on the inner side in the axial direction, and the elastic member 5 has an engagement protrusion 5 b that engages with the circumferential groove 8. It differs from the rolling bearing of one embodiment. The other structure is considered to be the same as that of the first embodiment, and the description will be given with the same reference numerals.

段差部７は、図６に示すように、円筒面状をなす外周面７ｂの軸方向内側に径方向内向きに凹む周溝８が形成されたものである。周溝８は、円筒面をなす溝底面８ａと、溝底面８ａの軸方向内縁から径方向外向きに形成される第一溝側面８ｂと、溝底面８ａの軸方向外縁から径方向外向きに形成される第二溝側面８ｃとを有する。 As shown in FIG. 6, the stepped portion 7 is formed by forming a circumferential groove 8 that is recessed radially inward on the axially inner side of the outer peripheral surface 7 b having a cylindrical surface shape. The circumferential groove 8 includes a groove bottom surface 8a that forms a cylindrical surface, a first groove side surface 8b that is formed radially outward from the axial inner edge of the groove bottom surface 8a, and a radially outer edge from the axial outer edge of the groove bottom surface 8a. And a second groove side surface 8c to be formed.

周溝８の第一溝側面８ｂは、径方向の断面形状が段差部７の側面７ａに対して同一平面上に連続している。第二溝側面８ｃは、段差部７の側面７ａに平行となっている。 The first groove side surface 8 b of the circumferential groove 8 has a radial cross-sectional shape that is continuous with the side surface 7 a of the stepped portion 7 on the same plane. The second groove side surface 8 c is parallel to the side surface 7 a of the step portion 7.

弾性部材５は、図８に示すように、径方向の断面が矩形となる円環状の本体部５ａと、本体部５ａの内周の全周に形成される係合突部５ｂとが一体に形成されたものである。 As shown in FIG. 8, the elastic member 5 includes an annular main body 5a having a rectangular cross section in the radial direction and an engaging protrusion 5b formed on the entire inner periphery of the main body 5a. It is formed.

本体部５ａは、弾性変形していない自然状態での軸方向の幅寸法Ｗが段差部７の側面７ａと外輪１の端面１ｂとの軸方向寸法Ｌよりも大きく形成されている。また、本体部５ａは、弾性変形していない自然状態での内径寸法ｄ５が段差部７の外周面７ｂの外径寸法ｄ６よりも小さく形成されている。 The body portion 5a is formed such that the axial width dimension W in a natural state where the body portion 5a is not elastically deformed is larger than the axial dimension L between the side surface 7a of the stepped portion 7 and the end surface 1b of the outer ring 1. The main body portion 5 a is formed so that the inner diameter dimension d 5 in a natural state where the body section 5 a is not elastically deformed is smaller than the outer diameter dimension d 6 of the outer peripheral surface 7 b of the stepped portion 7.

係合突部５ｂは、径方向の断面が矩形であり、本体部５ａの軸方向他端に径方向内向きに突出するものである。係合突部５ｂの軸方向他端面は、本体部５ａの軸方向他端面と同一平面上で連続している。係合突部５ｂは、周溝８の径方向の断面形状と同形状である。 The engagement protrusion 5b has a rectangular cross section in the radial direction, and protrudes radially inward from the other axial end of the main body 5a. The other axial end surface of the engaging protrusion 5b is continuous with the other axial end surface of the main body 5a on the same plane. The engagement protrusion 5b has the same shape as the cross-sectional shape of the circumferential groove 8 in the radial direction.

弾性部材５の係合突部５ｂが段差部７の周溝８に嵌め込まれ、弾性部材５の本体部５ａが段差部７の外周面７ｂに巻き付けられると、弾性部材５の本体部５ａは、段差部７の外周面７ｂを締め付ける状態となる。 When the engaging protrusion 5b of the elastic member 5 is fitted into the circumferential groove 8 of the stepped portion 7, and the main body portion 5a of the elastic member 5 is wound around the outer peripheral surface 7b of the stepped portion 7, the main body portion 5a of the elastic member 5 is The outer peripheral surface 7b of the stepped portion 7 is tightened.

第二の実施形態に係る転がり軸受２０は、以上のようなものであり、ハウジング３０の内周部への嵌合の際、弾性部材５の係合突部５ｂを段差部７の周溝８に嵌め込んだ状態で、段差部７の外周面７ｂに弾性部材５の本体部５ａを巻き付ける。 The rolling bearing 20 according to the second embodiment is as described above. When the rolling bearing 20 is fitted to the inner peripheral portion of the housing 30, the engaging protrusion 5 b of the elastic member 5 is inserted into the peripheral groove 8 of the stepped portion 7. The main body 5a of the elastic member 5 is wound around the outer peripheral surface 7b of the stepped portion 7 in a state where the elastic member 5 is fitted.

弾性部材５は、その復元弾性力により、本体部５ａが段差部７の外周面７ｂを押し付け、係合突部５ｂが周溝８内に嵌り込む。係合突部５ｂが周溝８内に嵌り込むことにより、弾性部材５は段差部７に保持される。 In the elastic member 5, the main body 5 a presses the outer peripheral surface 7 b of the stepped portion 7 by the restoring elastic force, and the engaging protrusion 5 b is fitted in the circumferential groove 8. The elastic member 5 is held by the stepped portion 7 by fitting the engaging protrusion 5 b into the circumferential groove 8.

弾性部材５が段差部７に保持された状態で、第一の実施形態と同様に、転がり軸受２０の外輪１がハウジング３０の内周にすき間はめにより嵌合され、内輪２がシャフト４０の外周に径方向にすき間はめにより嵌合される。 In a state where the elastic member 5 is held by the stepped portion 7, the outer ring 1 of the rolling bearing 20 is fitted to the inner periphery of the housing 30 by a clearance fit, and the inner ring 2 is the outer periphery of the shaft 40, as in the first embodiment. Are fitted with a gap fit in the radial direction.

転がり軸受２０は、弾性部材５を段差部７に保持した状態でハウジング３０の内周部に取り付けることができる。このため、転がり軸受２０のハウジング３０の内周部への取り付け作業性が向上する。また、周溝８内に係合突部５ｂが嵌り合うので、弾性部材５は段差部７から軸方向外側への脱落が防止される。 The rolling bearing 20 can be attached to the inner peripheral portion of the housing 30 with the elastic member 5 held by the stepped portion 7. For this reason, the workability of attaching the rolling bearing 20 to the inner peripheral portion of the housing 30 is improved. Moreover, since the engagement protrusion 5b fits into the circumferential groove 8, the elastic member 5 is prevented from falling off from the stepped portion 7 in the axial direction.

この実施形態に係る転がり軸受２０も、第一の実施形態の場合と同様に、ハウジング３０の突出部３１と、シャフト４０の段部４１とにより軸方向に位置決めされる。 Similarly to the case of the first embodiment, the rolling bearing 20 according to this embodiment is also positioned in the axial direction by the protruding portion 31 of the housing 30 and the step portion 41 of the shaft 40.

軸方向に位置決めされた転がり軸受２０は、外輪１の端面１ｂがハウジング３０の突出部３１に突き合わされる。ここで、弾性部材５は、軸方向の幅寸法Ｗが段差部７の側面７ａと外輪１の端面１ｂとの軸方向寸法Ｌよりも大きくなっている。 In the rolling bearing 20 positioned in the axial direction, the end surface 1 b of the outer ring 1 is abutted against the protruding portion 31 of the housing 30. Here, the elastic member 5 has an axial width dimension W larger than an axial dimension L between the side surface 7 a of the stepped portion 7 and the end surface 1 b of the outer ring 1.

このため、弾性部材５の本体部５ａは、突出部３１と段差部７の側面７ａとの間で軸方向に押し潰された状態となる。軸方向に押し潰された弾性部材５の本体部５ａは、ハウジング３０の突出部３１を軸方向に押し付ける向きに弾性復元しようとする。 For this reason, the main body portion 5 a of the elastic member 5 is in a state of being crushed in the axial direction between the protruding portion 31 and the side surface 7 a of the stepped portion 7. The main body portion 5a of the elastic member 5 crushed in the axial direction tries to be elastically restored in a direction in which the protruding portion 31 of the housing 30 is pressed in the axial direction.

弾性復元しようとする弾性部材５の本体部５ａにより、外輪１は、ハウジング３０に対して摩擦抵抗が生じ、転がり軸受２０とハウジング３０の間のクリープを防止することができる。 The outer ring 1 causes a frictional resistance with respect to the housing 30 by the main body portion 5a of the elastic member 5 to be elastically restored, and creep between the rolling bearing 20 and the housing 30 can be prevented.

なお、弾性部材５は、本体部５ａの軸方向外側面が平面となっているが、例えば、図９（ａ）、（ｂ）に示すように、本体部５ａの軸方向外側面に周方向外向きに突出する突起部５ｃを周方向に間隔をおいて複数配置してもよい。 The elastic member 5 has a flat outer surface in the axial direction of the main body portion 5a. For example, as shown in FIGS. 9A and 9B, the elastic member 5 has a circumferential direction on the outer surface in the axial direction of the main body portion 5a. A plurality of protruding portions 5c protruding outward may be arranged at intervals in the circumferential direction.

この場合、弾性復元しようとする弾性部材５の本体部５ａによりハウジング３０に対して生ずる摩擦抵抗をより大きくすることができる。 In this case, the frictional resistance generated with respect to the housing 30 by the main body 5a of the elastic member 5 to be elastically restored can be further increased.

また、弾性部材５は、本体部５ａの内周に係合突部５ｂが全周にわたって設けられているが、これに限られない。図１０（ａ）、（ｂ）に示すように、係合突部５ｂを本体部５ａの内周に周方向に間隔をおいて複数配置してもよい。弾性部材５としては、係合突部５ｂが周溝８内に係合し、軸方向外向きへの脱落を防止できるものであればよい。 Moreover, although the elastic member 5 is provided with the engaging protrusion 5b in the inner periphery of the main-body part 5a over the perimeter, it is not restricted to this. As shown in FIGS. 10 (a) and 10 (b), a plurality of engaging protrusions 5b may be arranged on the inner periphery of the main body 5a at intervals in the circumferential direction. As the elastic member 5, any member can be used as long as the engaging protrusion 5 b engages in the circumferential groove 8 and can be prevented from dropping outward in the axial direction.

この発明の第三の実施形態に係る転がり軸受を図１１〜１４に基づいて説明する。この実施形態の転がり軸受２０は、図１１に示すように、段差部７が内輪２の外周面２ａとその内輪２の軸方向一方の端面２ｂとの間に設けられる点で上述した第一の実施形態の転がり軸受と相違する。その他の構造は、第一の実施形態と同じと考えられ、同じ符号を付してその説明を説明する。 The rolling bearing which concerns on 3rd embodiment of this invention is demonstrated based on FIGS. In the rolling bearing 20 of this embodiment, as shown in FIG. 11, the first step described above in that the stepped portion 7 is provided between the outer peripheral surface 2 a of the inner ring 2 and one end surface 2 b in the axial direction of the inner ring 2. It differs from the rolling bearing of the embodiment. The other structure is considered to be the same as that of the first embodiment, and the description will be given with the same reference numerals.

図１２に示すように、段差部７は、内輪２の外周面２ａとその内輪２の軸方向一方の端面２ｂとの間に設けられ、軸方向外側を向く側面７ａと径方向外側を臨む外周面７ｂとを有している。 As shown in FIG. 12, the stepped portion 7 is provided between the outer peripheral surface 2a of the inner ring 2 and one end surface 2b in the axial direction of the inner ring 2, and the outer periphery facing the side surface 7a facing the outer side in the axial direction and the outer side in the radial direction. And a surface 7b.

外周面７ｂは、その軸方向外側寄りの位置に径方向内向きに凹む周溝８を有している。周溝８の第二溝側面８ｃは、その径方向の断面形状が軸方向外側に向かって径方向外向きに傾斜し、内輪２の端面２ｂの径方向外縁に達している。 The outer peripheral surface 7b has a circumferential groove 8 that is recessed radially inward at a position closer to the outer side in the axial direction. The second groove side surface 8c of the circumferential groove 8 has a radial cross-sectional shape that is inclined radially outward toward the outer side in the axial direction and reaches the radial outer edge of the end surface 2b of the inner ring 2.

周溝８の溝底面８ａの外径寸法ｄ７が第二溝側面８ｃの軸方向外縁（内輪２の端面２ｂの径方向外縁）の外径寸法ｄ８よりも小さくなっている。 The outer diameter dimension d7 of the groove bottom surface 8a of the circumferential groove 8 is smaller than the outer diameter dimension d8 of the axial outer edge of the second groove side surface 8c (the radial outer edge of the end surface 2b of the inner ring 2).

弾性部材５は、弾性を有する断面円形の円環体からなり、弾性変形していない自然状態での内径寸法ｄ９が周溝８の溝底面８ａの外径寸法ｄ７よりも小さく形成されている。このため、弾性部材５が段差部７の周溝８内に巻き付けられると、第一の実施形態の場合と同様に、弾性部材５が周溝８の第一溝側面８ｂおよび第二溝側面８ｃを締め付ける状態となる。 The elastic member 5 is made of an annular member having a circular cross section having elasticity, and has an inner diameter dimension d9 in a natural state that is not elastically deformed, which is smaller than an outer diameter dimension d7 of the groove bottom surface 8a of the circumferential groove 8. For this reason, when the elastic member 5 is wound in the circumferential groove 8 of the stepped portion 7, the elastic member 5 becomes the first groove side surface 8b and the second groove side surface 8c of the circumferential groove 8 as in the case of the first embodiment. Will be in a state of tightening.

また、弾性部材５は、弾性変形していない自然状態での径方向断面における直径ｄ４（転がり軸受２０での軸方向の幅寸法）が段差部７の側面７ａと内輪２の端面２ｂとの軸方向寸法Ｌよりも大きく形成されている。 The elastic member 5 has a diameter d4 (a width dimension in the axial direction of the rolling bearing 20) in a radial cross section in a natural state in which the elastic member 5 is not elastically deformed, and is an axis between the side surface 7a of the stepped portion 7 and the end surface 2b of the inner ring 2. It is formed larger than the direction dimension L.

第三の実施形態に係る転がり軸受２０は、以上のようなものであり、ハウジング３０の内周部への嵌合の際、段差部７の外周面７ｂに弾性部材５を巻き付ける。このとき、弾性部材５は、その復元弾性力により周溝８の第一溝側面８ｂおよび第二溝側面８ｃを押し付けるように周溝８内に嵌り込むこととなる。周溝８に嵌り込む弾性部材５は段差部７に保持される。 The rolling bearing 20 according to the third embodiment is as described above, and the elastic member 5 is wound around the outer peripheral surface 7 b of the stepped portion 7 when fitting to the inner peripheral portion of the housing 30. At this time, the elastic member 5 is fitted into the circumferential groove 8 so as to press the first groove side surface 8b and the second groove side surface 8c of the circumferential groove 8 by the restoring elastic force. The elastic member 5 fitted in the circumferential groove 8 is held by the step portion 7.

このように、弾性部材５を段差部７の周溝８内に保持した状態で、転がり軸受２０をハウジング３０の内周部に取り付けることができるため、転がり軸受２０のハウジング３０の内周部への取り付け作業性が向上する。 In this manner, the rolling bearing 20 can be attached to the inner peripheral portion of the housing 30 while the elastic member 5 is held in the circumferential groove 8 of the stepped portion 7, so that the rolling bearing 20 is moved to the inner peripheral portion of the housing 30. The mounting workability of the is improved.

そして、図１３に示すように、転がり軸受２０は、ハウジング３０の突出部３１と、シャフト４０の段部４１とにより軸方向に位置決めされる。 As shown in FIG. 13, the rolling bearing 20 is positioned in the axial direction by the protruding portion 31 of the housing 30 and the step portion 41 of the shaft 40.

軸方向に位置決めされた転がり軸受２０は、内輪２の端面２ｂがシャフト４０の段部４１に突き合わされた状態となる。ここで、弾性部材５は、上記直径ｄ４が段差部７の側面７ａと内輪２の端面２ｂとの軸方向寸法Ｌよりも大きく形成されている。 The rolling bearing 20 positioned in the axial direction is in a state where the end surface 2 b of the inner ring 2 is abutted against the step portion 41 of the shaft 40. Here, the elastic member 5 is formed such that the diameter d4 is larger than the axial dimension L between the side surface 7a of the stepped portion 7 and the end surface 2b of the inner ring 2.

このため、図１４に示すように、弾性部材５は、段部４１と段差部７の側面７ａとの間で軸方向に押し潰された状態となる。軸方向に押し潰された弾性部材５は、シャフト４０の段部４１を軸方向に押し付ける向きに弾性復元しようとする。 For this reason, as shown in FIG. 14, the elastic member 5 will be in the state crushed in the axial direction between the step part 41 and the side surface 7a of the step part 7. As shown in FIG. The elastic member 5 crushed in the axial direction tries to be elastically restored in a direction in which the step portion 41 of the shaft 40 is pressed in the axial direction.

弾性復元しようとする弾性部材５により、内輪２は、シャフト４０に対して摩擦抵抗が生じ、転がり軸受２０とシャフト４０の間のクリープを防止することができる。 The elastic member 5 to be elastically restored causes the inner ring 2 to have a frictional resistance with respect to the shaft 40, thereby preventing creep between the rolling bearing 20 and the shaft 40.

１外輪
１ａ外周面
１ｂ端面
２内輪
２ａ外周面
２ｂ端面
３玉
４保持器
４ａリム部
４ｂ柱部
５弾性部材
５ａ本体部
５ｂ係合突部
５ｃ突起部
６軌道面
７段差部
７ａ側面
７ｂ外周面
８周溝
８ａ溝底面
８ｂ第一溝側面
８ｃ第二溝側面
９軌道面
２０転がり軸受
３０ハウジング
３１突出部
４０シャフト
４１段部
ｄ１、ｄ２、ｄ６、ｄ７、ｄ８外径寸法
ｄ３、ｄ５、ｄ９内径寸法
ｄ４直径
Ｌ軸方向寸法
Ｗ幅寸法 DESCRIPTION OF SYMBOLS 1 Outer ring 1a Outer peripheral surface 1b End surface 2 Inner ring 2a Outer peripheral surface 2b End surface 3 Ball 4 Cage 4a Rim part 4b Column part 5 Elastic member 5a Body part 5b Engagement protrusion part 5c Projection part 6 Track surface 7 Step part 7a Side face 7b Outer peripheral surface 8 circumferential groove 8a groove bottom surface 8b first groove side surface 8c second groove side surface 9 raceway surface 20 rolling bearing 30 housing 31 protruding portion 40 shaft 41 stepped portions d1, d2, d6, d7, d8 outer diameters d3, d5, d9 inner diameter Dimension d4 Diameter L Axial dimension W Width dimension

Claims

An outer ring, an inner ring disposed radially inward of the outer ring, a plurality of rolling elements disposed between the outer ring and the inner ring, and a cage that holds the plurality of rolling elements at intervals in the circumferential direction And
A radially inward step portion provided between the outer peripheral surface of the outer ring and one end surface in the axial direction of the outer ring or between the outer peripheral surface of the inner ring and one end surface in the axial direction of the inner ring;
An annular elastic member held in a state wound around the radial outer periphery of the stepped portion;
A rolling bearing in which the elastic member has an axial width dimension larger than an axial dimension of the stepped portion.

The rolling bearing according to claim 1, further comprising a circumferential groove that engages with the elastic member on an outer circumferential surface of the stepped portion.

The step portion is provided on an outer peripheral surface of the outer ring, the circumferential groove is positioned on an inner side in the axial direction of the step portion, and the elastic member has an engagement protrusion that fits into the circumferential groove. Rolling bearings described in 1.

The rolling bearing according to any one of claims 1 to 3, wherein the elastic member has a protruding portion that protrudes outward in the axial direction on an outer surface in the axial direction, and a plurality of the protruding portions are arranged in the circumferential direction.

The rolling bearing according to claim 3, wherein the engaging protrusion of the elastic member is formed over the entire circumference.

The rolling bearing according to claim 3, wherein a plurality of engaging protrusions of the elastic member are arranged at intervals in the circumferential direction.