JP2010025203A - Crown type retainer - Google Patents

Crown type retainer Download PDF

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JP2010025203A
JP2010025203A JP2008186287A JP2008186287A JP2010025203A JP 2010025203 A JP2010025203 A JP 2010025203A JP 2008186287 A JP2008186287 A JP 2008186287A JP 2008186287 A JP2008186287 A JP 2008186287A JP 2010025203 A JP2010025203 A JP 2010025203A
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Prior art keywords
pitch circle
ball
cage
pocket
portions
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JP2008186287A
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JP5131068B2 (en
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Tomoyuki Aida
友之 合田
Shinichi Mizuta
進一 水田
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JTEKT Corp
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JTEKT Corp
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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
    • F16C33/66—Special parts or details in view of lubrication
    • F16C33/6637—Special parts or details in view of lubrication with liquid lubricant
    • F16C33/6681—Details of distribution or circulation inside the bearing, e.g. grooves on the cage or passages in the rolling elements
    • 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
    • F16C33/416—Massive or moulded comb cages, e.g. snap ball cages formed as one-piece cages, i.e. monoblock comb cages made from plastic, e.g. injection moulded 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
    • 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 provide a crown type retainer for a ball bearing capable of preventing the local contact with balls by deformation even without attaching a separate member for increasing stiffness. <P>SOLUTION: To retain a plurality of balls 3 rotatably freely on a pitch circle P, a plurality of pockets 7 opening to one side in the axial direction are formed in the circumferential direction. Each pocket 7 has a bottom spherical portion 21, which constitutes a bottom, and facing spherical portions 22, 23, which are formed so as to face each other from the bottom spherical portion 21 to the opening side. One facing spherical portion 22 at each pocket 7 is formed inside in the radial direction to the pitch circle P, while the other facing spherical portion 23 is formed outside in the radial direction to the pitch circle P. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、玉軸受用の冠型保持器に関する。   The present invention relates to a crown type cage for ball bearings.

一般的な玉軸受として、外輪と、内輪と、外輪軌道面および内輪軌道面を転動する複数の玉と、これら複数の玉を転動自在として保持している合成樹脂製の冠型保持器（以下、保持器ともいう）とを備えたものがある。図６（ａ）は、従来の保持器４０の一部を示した斜視図であり、図６（ｂ）は、玉軸受内に取り付けられた状態にある従来の保持器４０の断面図である。図６（ａ）において、この保持器４０には、複数の玉４１を転動自在に保持するために、ポケット４２が周方向に等間隔で複数形成されている。ポケット４２は軸方向一方側（図６（ａ）では上方側）に開口して形成されている。また、ポケット４２が形成されている部分には、対向する一対の爪部４３が設けられており、これら一対の爪部４３によってポケット４２内に配置した玉４１が抜け出ることを防止している。   As general ball bearings, outer ring, inner ring, outer ring raceway surface and a plurality of balls rolling on the inner ring raceway surface, and a synthetic resin crown-type cage that holds the plurality of balls as rollable (Hereinafter also referred to as a cage). FIG. 6A is a perspective view showing a part of a conventional cage 40, and FIG. 6B is a cross-sectional view of the conventional cage 40 in a state of being installed in a ball bearing. . In FIG. 6A, the retainer 40 is formed with a plurality of pockets 42 at equal intervals in the circumferential direction in order to hold a plurality of balls 41 in a freely rollable manner. The pocket 42 is formed so as to open to one side in the axial direction (the upper side in FIG. 6A). Further, a pair of claw portions 43 facing each other is provided in a portion where the pocket 42 is formed, and the pair of claw portions 43 prevents the balls 41 disposed in the pocket 42 from coming out.

玉軸受が回転すると、これに伴って保持器４０も回転し、保持器４０に遠心力が作用する。特に玉軸受の回転数が高く（例えば内径３０ｍｍの玉軸受で３万ｒｐｍ）、高温（例えば１００℃）の環境で使用される場合、例えば、エンジンの補機用として使用される場合、保持器４０は合成樹脂製であって、保持器４０の爪部４３側は、環状となっている基部４６に比べて剛性が低い形状となっているため、前記遠心力により、図６（ｂ）の破線で示しているように、爪部４３側は径方向外方（外輪４９側）へ変形する。これに対し玉４１は玉軸受内でピッチ円上に配置されたままであることから、前記変形によって、両側の爪部４３それぞれの内周部４４は玉４１に接近しさらにその先端部が局部的に接触し、両側の内周部４４によって、玉４１に形成されている油膜（潤滑油）が掻き取られるおそれがある。このため玉４１表面の潤滑油が不足し、玉軸受における潤滑状態が悪化し、玉軸受が焼き付くおそれがある。
そこで、特許文献１に示しているように、ポケットの開口側に環状の補強部材が取り付けられている保持器がある。 When the ball bearing rotates, the cage 40 also rotates with this, and centrifugal force acts on the cage 40. In particular, when the rotational speed of the ball bearing is high (for example, 30,000 rpm for a ball bearing having an inner diameter of 30 mm) and used in a high temperature (for example, 100 ° C.) environment, 40 is made of synthetic resin, and the claw portion 43 side of the retainer 40 has a shape lower in rigidity than the annular base portion 46. Therefore, due to the centrifugal force, FIG. As indicated by a broken line, the claw 43 side is deformed radially outward (outer ring 49 side). On the other hand, since the balls 41 remain arranged on the pitch circle in the ball bearings, the inner peripheral portion 44 of each of the claw portions 43 on both sides approaches the balls 41 by the deformation, and the tip portion thereof is localized. The oil film (lubricating oil) formed on the balls 41 may be scraped off by the inner peripheral portions 44 on both sides. For this reason, the lubricating oil on the surface of the ball 41 is insufficient, the lubrication state of the ball bearing is deteriorated, and the ball bearing may be seized.
Therefore, as shown in Patent Document 1, there is a cage in which an annular reinforcing member is attached to the opening side of the pocket.

実開平６−１８４８号公報（図３参照）Japanese Utility Model Laid-Open No. 6-1848 (see FIG. 3)

特許文献１に記載の保持器によれば、遠心力に基づく保持器の変形を補強部材が抑え、保持器の一部が玉に局部的に接触するのを防止し、玉の潤滑油が掻き取られるのを防ぐことができる。しかし、補強部材が別途必要となっているため、保持器の部品点数が増加し、コスト高になるという問題点がある。   According to the cage described in Patent Document 1, the reinforcing member suppresses deformation of the cage due to centrifugal force, prevents a part of the cage from contacting the ball locally, and the lubricating oil of the ball scrapes. Can be prevented from being taken. However, since a reinforcing member is required separately, there is a problem that the number of parts of the cage increases and the cost increases.

そこで、本発明は、剛性を高めるための別部材を取り付けなくても、遠心力に基づく変形によって玉に局部的に接触することを防止できる冠型保持器を提供することを目的とする。   Therefore, an object of the present invention is to provide a crown type cage that can prevent local contact with a ball due to deformation based on centrifugal force without attaching a separate member for increasing rigidity.

前記目的を達成するための本発明の冠型保持器は、軸方向一方側に開口し、ピッチ円上に設けられた複数の玉を転動自在に保持するポケットが周方向に複数形成された玉軸受用の冠型保持器において、前記ポケットそれぞれは、当該ポケットの底となる底球面部と、この底球面部から開口側に相互が対向して形成されている一対の対向球面部と、を有し、前記ポケットそれぞれにおける前記一対の対向球面部の内の一方は、前記ピッチ円に対して径方向内寄りに形成され、前記一対の対向球面部の内の他方は、前記ピッチ円に対して径方向外寄りに形成され、遠心力によって変形した際に、前記他方の対向球面部の内周部が前記玉と非接触となるように当該他方の対向球面部側の保持器内周面から前記ピッチ円までの距離が設定されている。   In order to achieve the above object, the crown type cage of the present invention has an opening on one side in the axial direction, and a plurality of pockets are formed in the circumferential direction to hold a plurality of balls provided on the pitch circle in a freely rolling manner. In the crown type cage for ball bearings, each of the pockets includes a bottom spherical surface portion serving as a bottom of the pocket, and a pair of opposed spherical surface portions formed to face each other from the bottom spherical surface portion to the opening side, One of the pair of opposed spherical portions in each of the pockets is formed radially inward with respect to the pitch circle, and the other of the pair of opposed spherical portions is formed on the pitch circle. On the other hand, the inner circumferential surface of the other opposing spherical surface side is formed so that the inner circumferential portion of the other opposing spherical surface portion is in non-contact with the ball when deformed by centrifugal force. A distance from the surface to the pitch circle is set.

本発明によれば、玉軸受が回転すると冠型保持器も回転し、遠心力によって冠型保持器が拡径するように変形する。これにより、玉のピッチ円に対して径方向内寄りに形成された一方の対向球面部の内周部は、玉に近づくように変位するが、ピッチ円に対して径方向外寄りに形成された他方の対向球面部の外周部は、玉から離れる方向に変位するので、対向する対向球面部の間隔が狭くなることを抑制することができる。そして、遠心力によって冠型保持器が変形した際に、他方の対向球面部の内周部は玉と非接触となる。このため、従来のように剛性を高めるための補強部材を別途設けなくても、冠型保持器の一部が玉に局部的に接触するのを防止することができ、当該接触による発熱、摩耗を防ぐことができる。   According to the present invention, when the ball bearing rotates, the crown-shaped cage also rotates, and the crown-shaped cage is deformed so as to expand its diameter by centrifugal force. As a result, the inner peripheral portion of one opposing spherical portion formed radially inward with respect to the pitch circle of the ball is displaced so as to approach the ball, but is formed radially outward with respect to the pitch circle. Since the outer peripheral portion of the other opposing spherical surface portion is displaced in the direction away from the ball, it is possible to suppress the interval between the opposing opposing spherical portions from being narrowed. When the crown type cage is deformed by the centrifugal force, the inner peripheral portion of the other opposing spherical portion is not in contact with the ball. For this reason, it is possible to prevent a part of the crown-type cage from contacting the ball locally without separately providing a reinforcing member for increasing the rigidity as in the prior art. Can be prevented.

本発明によれば、ポケットの対向する対向球面部の間隔が狭くなることを抑制することができるので、冠型保持器の一部が玉に局部的に接触するのを防止することができ、当該接触による発熱、摩耗を防ぐことができる。この結果、従来のように冠型保持器の部品点数が増加しコスト高となってしまうのを防止することができる。   According to the present invention, since it is possible to suppress the interval between the opposing spherical portions of the pockets from becoming narrow, it is possible to prevent a part of the crown-shaped cage from contacting the ball locally, Heat generation and wear due to the contact can be prevented. As a result, it is possible to prevent the number of parts of the crown-type cage from increasing and increasing the cost as in the prior art.

以下、本発明の実施の形態を図面に基づいて説明する。
図１は本発明の冠型保持器が取り付けられた状態にある玉軸受の断面図である。この玉軸受は、外輪１と、この外輪１と同心上に設けられている内輪２と、外輪１および内輪２の間に設けられた複数の玉３と、これら複数の玉３を等間隔で保持する冠型保持器４（以下、保持器４という）とを備えている。
外輪１の内周面に外輪軌道面１１が形成されており、内輪２の外周面に内輪軌道面１２が形成されている。複数の玉３それぞれの中心は、玉軸受の軸心Ｃを中心とする一つのピッチ円Ｐ上に配置されており、これらの玉３は、外輪軌道面１１および内輪軌道面１２を転動する。そして、保持器４は、ピッチ円Ｐ上にあるこれら複数の玉３を転動自在として保持している。なお、玉３は全て同じものである。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of a ball bearing in a state where a crown type cage of the present invention is attached. The ball bearing includes an outer ring 1, an inner ring 2 provided concentrically with the outer ring 1, a plurality of balls 3 provided between the outer ring 1 and the inner ring 2, and the plurality of balls 3 at equal intervals. A crown-shaped cage 4 (hereinafter referred to as cage 4) is provided.
An outer ring raceway surface 11 is formed on the inner peripheral surface of the outer ring 1, and an inner ring raceway surface 12 is formed on the outer peripheral surface of the inner ring 2. The center of each of the plurality of balls 3 is arranged on one pitch circle P centered on the axis C of the ball bearing, and these balls 3 roll on the outer ring raceway surface 11 and the inner ring raceway surface 12. . And the holder | retainer 4 hold | maintains these some balls 3 on the pitch circle P as rolling freely. The balls 3 are all the same.

図２は保持器４の斜視図である。図１および図２に示しているように、保持器４には、複数（図例では１０個）の前記玉３を転動自在に保持するポケット７が周方向に複数（図例では１０個）形成されており、ポケット７は、軸方向の一方側（図１および図２では左側）に開口している。保持器４の全体形状は環状となっていて、いわゆる冠型として構成されている。また、保持器４は合成樹脂製である。複数の玉３それぞれを、ポケット７内に押し入れる際に、玉３によってポケット７の開口端１８ａ，１８ｂの間が弾性的に押し広げられる。   FIG. 2 is a perspective view of the cage 4. As shown in FIGS. 1 and 2, the retainer 4 has a plurality of pockets 7 (10 in the illustrated example) for holding the balls 3 in a rollable manner in the circumferential direction (10 in the illustrated example). ) And the pocket 7 is open on one side in the axial direction (left side in FIGS. 1 and 2). The overall shape of the cage 4 is annular, and is configured as a so-called crown shape. The cage 4 is made of synthetic resin. When each of the plurality of balls 3 is pushed into the pocket 7, the space between the open ends 18 a and 18 b of the pocket 7 is elastically expanded by the balls 3.

保持器４は、円環状の基部６と本体部８とを有している。本体部８は、ポケット７が形成されている部分であり、基部６は、外輪１と内輪２との間に設けられている複数の玉３よりも軸方向の他方側（図１および図２では右側）に配置されている部分である。本体部８は、柱部１４を周方向に複数有していて、各柱部１４は環状の基部６から軸方向の一方側（図２では左側）へ突出している。そして、周方向に隣り合う柱部１４間が前記ポケット７となる。柱部１４それぞれの軸方向の一方側には、一対の爪部１７ａ，１７ａ（１７ｂ，１７ｂ）が当該一方側へさらに突出して設けられている。そして、ポケット７を挟んで対向する爪部１７ａ，１７ｂが、当該ポケット７内に配置した玉３が抜け出ることを防止する。爪部１７ａ，１７ｂの内面側の先端がポケット開口端１８ａ，１８ｂとなる。   The cage 4 has an annular base 6 and a main body 8. The main body portion 8 is a portion in which the pocket 7 is formed, and the base portion 6 is on the other side in the axial direction than the plurality of balls 3 provided between the outer ring 1 and the inner ring 2 (FIGS. 1 and 2). In the right side). The main body portion 8 has a plurality of column portions 14 in the circumferential direction, and each column portion 14 protrudes from the annular base portion 6 to one side in the axial direction (left side in FIG. 2). And between the column parts 14 adjacent to the circumferential direction becomes the pocket 7. A pair of claw portions 17a and 17a (17b and 17b) are provided on one side in the axial direction of each of the column portions 14 so as to further protrude toward the one side. And the nail | claw parts 17a and 17b which oppose on both sides of the pocket 7 prevent that the ball | bowl 3 arrange | positioned in the said pocket 7 slips out. The tips of the claw portions 17a and 17b on the inner surface side become pocket opening ends 18a and 18b.

図３は、ポケット７およびその周辺部の説明図である。ポケット７それぞれは、当該ポケット７の底となる底球面部２１と、この底球面部２１から開口側へ延びるようにして形成されている一対の対向球面部２２，２３とを有している。一対の対向球面部２２，２３は、相互が対向するように形成されている。底球面部２１および対向球面部２２，２３によって、一つのポケット内面９が構成されていて、ポケット内面９は、一点Ｃ０を中心とし、玉３の曲率半径ｒ１よりも若干大きな曲率半径ｒ２を有する球面に沿った形状である。つまり、一対の対向球面部２２，２３及び底球面部２１は、互いに同心の球面を形成している。保持器４が回転していない状態で、ポケット７の前記一点（ポケット７の中心点）Ｃ０は、ピッチ円Ｐ上に配設されポケット７ａに転動自在として収容させた玉３の中心点と一致する。   FIG. 3 is an explanatory diagram of the pocket 7 and its peripheral part. Each of the pockets 7 has a bottom spherical surface portion 21 serving as a bottom of the pocket 7 and a pair of opposed spherical surface portions 22 and 23 formed so as to extend from the bottom spherical surface portion 21 toward the opening side. The pair of opposing spherical portions 22 and 23 are formed so as to face each other. The bottom spherical surface portion 21 and the opposing spherical surface portions 22 and 23 constitute one pocket inner surface 9, and the pocket inner surface 9 has a radius of curvature r 2 that is slightly larger than the radius of curvature r 1 of the ball 3 with the center at one point C 0. The shape is along a spherical surface. That is, the pair of opposed spherical surface portions 22 and 23 and the bottom spherical surface portion 21 form concentric spherical surfaces. In a state where the cage 4 is not rotating, the one point (center point of the pocket 7) C0 of the pocket 7 is arranged on the pitch circle P and is centered on the ball 3 accommodated in the pocket 7a so as to be freely rollable. Match.

なお、ポケット内面９の内の前記底球面部２１は、保持器４を軸方向から見て（図３では上から下へ見て）ポケット開口端１８ａ，１８ｂ間に見える範囲であり、残りの両側部分それぞれが対向球面部２２，２３である。つまり、図３において、点ｍ１と点ｍ２間が底球面部２１であり、点ｍ１からポケット開口端１８ａまでが一方の対向球面部２２であり、点ｍ２からポケット開口端１８ｂまでが他方の対向球面部２３である。   The bottom spherical surface portion 21 in the pocket inner surface 9 is a range that can be seen between the pocket opening ends 18a and 18b when the cage 4 is viewed from the axial direction (when viewed from the top to the bottom in FIG. 3). Both side portions are opposed spherical surface portions 22 and 23, respectively. That is, in FIG. 3, the point between the point m1 and the point m2 is the bottom spherical surface portion 21, the point m1 to the pocket opening end 18a is one opposing spherical portion 22, and the point m2 to the pocket opening end 18b is the other facing portion. A spherical portion 23 is shown.

図４は玉３および保持器４を軸方向から見た説明図であり、図５（ａ）は図４の一部を拡大して説明する説明図である。なお、図４は、図３の矢印ＩＶにおける断面図（点Ｃ０を含む断面）である。ポケット７それぞれにおける前記対向球面部２２，２３の内の一方（図５（ａ）の左側の対向球面部２２）は、玉３のピッチ円Ｐに対して径方向内寄りに形成されていて、前記対向球面部２２，２３の内の他方（図５（ａ）の右側の対向球面部２３）は、玉３のピッチ円Ｐに対して径方向外寄りに形成されている。   FIG. 4 is an explanatory view of the balls 3 and the cage 4 as viewed from the axial direction, and FIG. 5A is an explanatory view illustrating a part of FIG. 4 in an enlarged manner. FIG. 4 is a cross-sectional view (a cross section including a point C0) taken along arrow IV in FIG. One of the opposing spherical portions 22 and 23 in each pocket 7 (the opposing spherical portion 22 on the left side in FIG. 5A) is formed radially inward with respect to the pitch circle P of the ball 3, The other of the opposed spherical portions 22 and 23 (the opposed spherical portion 23 on the right side in FIG. 5A) is formed radially outward with respect to the pitch circle P of the ball 3.

この保持器４の内の、一方の前記対向球面部２２が形成されている部分（第一の柱部１４ａ）に関して、玉３のピッチ円Ｐから当該部分の外周面３１までの距離ａ１は、ピッチ円Ｐから当該部分の内周面３２までの距離ａ２よりも小さく設定されている（ａ１＜ａ２）。これに対し、他方の前記対向球面部２３が形成されている部分（第二の柱部１４ｂ）に関して、玉３のピッチ円Ｐから当該部分の外周面３３までの距離ｂ１は、ピッチ円Ｐから当該部分の内周面３４までの距離ｂ２よりも大きく設定されている（ｂ１＞ｂ２）。そして、距離ｂ２＜距離ａ２となるように設定されている。なお、第一の柱部１４ａと第二の柱部１４ｂとの厚さ（径方向寸法）は同じである。この構成により、一方の対向球面部２２が、玉３のピッチ円Ｐに対して径方向内寄りに形成され、他方の対向球面部２３が、玉３のピッチ円Ｐに対して径方向外寄りに形成される。このように構成した保持器４によれば、一方の対向球面部２２と玉３との接触部（接触点）と、他方の対向球面部２３と当該玉３との接触部（接触点）とを、玉３のピッチ円Ｐに対して径方向内側と径方向外側とに異ならせて配置することができる。   Regarding the portion (first column portion 14a) in which one of the opposing spherical portions 22 is formed in the cage 4, the distance a1 from the pitch circle P of the balls 3 to the outer peripheral surface 31 of the portion is: It is set to be smaller than the distance a2 from the pitch circle P to the inner peripheral surface 32 of the part (a1 <a2). On the other hand, the distance b1 from the pitch circle P of the ball 3 to the outer peripheral surface 33 of the portion is from the pitch circle P with respect to the portion where the other opposing spherical surface portion 23 is formed (second column portion 14b). It is set larger than the distance b2 to the inner peripheral surface 34 of the part (b1> b2). The distance b2 <the distance a2. In addition, the thickness (diameter direction dimension) of the 1st pillar part 14a and the 2nd pillar part 14b is the same. With this configuration, one opposing spherical portion 22 is formed radially inward with respect to the pitch circle P of the ball 3, and the other opposing spherical portion 23 is radially outward with respect to the pitch circle P of the ball 3. Formed. According to the cage 4 configured in this way, the contact portion (contact point) between one opposing spherical surface portion 22 and the ball 3, and the contact portion (contact point) between the other opposing spherical surface portion 23 and the ball 3. Can be arranged differently on the radially inner side and the radially outer side with respect to the pitch circle P of the balls 3.

また、前記のとおり距離ａ１＜距離ａ２かつ距離ｂ１＞距離ｂ２とするにあたり、第一の柱部１４ａの外周面３１をピッチ円Ｐよりも径方向外側とし、第二の柱部１４ｂの内周面３４をピッチ円Ｐよりも径方向内側（ａ１＞０、ｂ２＞０）とし、距離ｂ２＜距離ａ２となるように設定されているが、外周面３１と内周面３４との内の一方又は双方をピッチ円Ｐと一致させてもよい（ａ１＝０、ｂ２＝０）。このように、第二柱部１４ｂの内周面３４からピッチ円Ｐまでの距離ｂ２は（距離ａ２よりも）小さくなるように設定されている。このように構成することで、保持器４が遠心力によって変形した際に、対向球面部２３の内周部２３ａ（爪部１７ｂの内周側端部）が玉３と非接触となるように構成することができる。例えば距離ｂ２＝０と設定すれば内周部２３ａが玉３と接触することはない。   Further, as described above, when the distance a1 <the distance a2 and the distance b1> the distance b2, the outer peripheral surface 31 of the first columnar portion 14a is set to be radially outward from the pitch circle P, and the inner periphery of the second columnar portion 14b. The surface 34 is set to be radially inward of the pitch circle P (a1> 0, b2> 0), and the distance b2 <the distance a2 is set, but one of the outer peripheral surface 31 and the inner peripheral surface 34 is set. Alternatively, both may coincide with the pitch circle P (a1 = 0, b2 = 0). Thus, the distance b2 from the inner peripheral surface 34 of the second pillar portion 14b to the pitch circle P is set to be smaller (than the distance a2). With this configuration, when the cage 4 is deformed by centrifugal force, the inner peripheral portion 23a of the opposing spherical surface portion 23 (the inner peripheral side end portion of the claw portion 17b) is not in contact with the ball 3. Can be configured. For example, if the distance b2 = 0 is set, the inner peripheral portion 23a does not contact the ball 3.

なお、図５（ｂ）は従来の保持器４０を説明している説明図であり、本発明に係る図５（ａ）と対比するための図である。従来の保持器４０では、一方の対向球面部４７が形成されている部分５０ａ、および、当該対向球面部４７に対向する他方の対向球面部４８が形成されている部分５０ｂの双方に関して、玉４１のピッチ円Ｐから外周面４０ａまでの距離ｄ１と、当該ピッチ円Ｐから保持器４０の内周面４０ｂまでの距離ｄ２とは、同じであり（ｄ１＝ｄ２）、対向している一対の対向球面部４７，４８は、玉４１のピッチ円Ｐに対して径方向で同じ位置に形成されている。   FIG. 5B is an explanatory diagram for explaining a conventional cage 40, and is a diagram for comparison with FIG. 5A according to the present invention. In the conventional cage 40, the ball 41 is related to both the portion 50 a where one opposing spherical portion 47 is formed and the portion 50 b where the other opposing spherical portion 48 is opposed to the opposing spherical portion 47. The distance d1 from the pitch circle P to the outer peripheral surface 40a and the distance d2 from the pitch circle P to the inner peripheral surface 40b of the cage 40 are the same (d1 = d2), and a pair of opposing faces The spherical portions 47 and 48 are formed at the same position in the radial direction with respect to the pitch circle P of the balls 41.

この従来の保持器４０の場合、玉軸受が回転すると、これに伴って保持器４０も回転し、保持器４０には遠心力が作用し拡径するように変形する。この際、玉４１はピッチ円Ｐ上に配置されたままであるため、前記のとおり、保持器４０の内のピッチ円Ｐよりも内周部（図６（ｂ）の爪部４３の内の内周部）４４は、玉４１に近づくように変位する。これにより、ポケット４２両側の内周部４４が玉４１に接近しさらに接触し、玉４１に形成されている油膜（潤滑油）が掻き取られるおそれがある。この場合、玉軸受における潤滑状態が悪化し、玉軸受が焼き付くおそれがある。   In the case of the conventional cage 40, when the ball bearing rotates, the cage 40 also rotates with this, and the cage 40 is deformed so that the diameter increases due to the centrifugal force. At this time, since the balls 41 remain arranged on the pitch circle P, as described above, the inner peripheral portion (the inner portion of the claw portion 43 in FIG. 6B) rather than the pitch circle P in the cage 40. The peripheral portion 44 is displaced so as to approach the ball 41. As a result, the inner peripheral portions 44 on both sides of the pocket 42 approach the ball 41 and come into further contact with each other, and the oil film (lubricating oil) formed on the ball 41 may be scraped off. In this case, the lubrication state of the ball bearing is deteriorated, and the ball bearing may be seized.

しかし、本発明によれば、玉軸受が回転すると保持器４も回転し、保持器４には遠心力が作用する（図４の矢印Ｒ参照）。この際、図５（ａ）において、玉３のピッチ円Ｐに対して径方向内寄りに形成された一方の対向球面部２２の内周部２２ａは、玉３に近づくように変位するが、ピッチ円Ｐに対して径方向外寄りに形成された他方の対向球面部２３の外周部２３ｂは、玉３から離れる方向に変位するので、対向する対向球面部２２，２３の間隔（ポケット７の玉３の収納空間）が狭くなることを抑制することができる。すなわち、本発明の構成によれば、ポケット内面９の直径Ｄ（図５（ａ）参照）が、遠心力による変形前後で変化することを抑えることができる。   However, according to the present invention, when the ball bearing rotates, the cage 4 also rotates, and centrifugal force acts on the cage 4 (see arrow R in FIG. 4). At this time, in FIG. 5A, the inner peripheral portion 22a of one opposing spherical surface portion 22 formed radially inward with respect to the pitch circle P of the ball 3 is displaced so as to approach the ball 3. Since the outer peripheral portion 23b of the other opposing spherical portion 23 formed radially outward with respect to the pitch circle P is displaced in a direction away from the ball 3, the distance between the opposing opposing spherical portions 22, 23 (of the pocket 7). It can suppress that the storage space of the ball | bowl 3 becomes narrow. That is, according to the configuration of the present invention, it is possible to prevent the diameter D (see FIG. 5A) of the pocket inner surface 9 from changing before and after deformation due to centrifugal force.

このため、対向球面部２２の内周部２２ａが玉３に局部的に接触することを防止でき、玉３に形成されている油膜が掻き取られるのを防ぐことができる。したがって、玉軸受が高速で回転（例えば内径３０ｍｍの玉軸受で３万ｒｐｍ）し、高温（例えば１００℃）の環境で使用される場合であっても、従来のように玉軸受における潤滑状態が悪化することを防止することができ、保持器４が局部的に摩耗したり玉軸受が焼き付いたりするのを防ぐことができる。   For this reason, it can prevent that the inner peripheral part 22a of the opposing spherical surface part 22 contacts the ball | bowl 3 locally, and can prevent that the oil film currently formed in the ball | bowl 3 is scraped off. Therefore, even when the ball bearing rotates at a high speed (for example, 30,000 rpm for a ball bearing having an inner diameter of 30 mm) and is used in a high temperature (for example, 100 ° C.) environment, the lubrication state in the ball bearing as in the prior art It is possible to prevent the deterioration, and it is possible to prevent the retainer 4 from being locally worn and the ball bearing from being seized.

また、図４に示しているように、玉３のピッチ円Ｐに対して径方向内寄りに形成された対向球面部２２を両側部に有する柱部１４ａと、ピッチ円Ｐに対して径方向外寄りに形成された対向球面部２３を両側部に有する柱部１４ｂとは、周方向に交互に設けられている。すなわち、径方向内寄りに形成された対向球面部２２を有する柱部１４ａと、径方向外寄りに形成された対向球面部２３を有する柱部１４ｂとは、ピッチ円Ｐを中心として内径側と外径側とに交互に配設されている。   Further, as shown in FIG. 4, column portions 14 a having opposing spherical portions 22 formed on both sides in the radial direction with respect to the pitch circle P of the balls 3, and the radial direction with respect to the pitch circle P The column portions 14b having opposite spherical portions 23 formed on the outer sides on both sides are alternately provided in the circumferential direction. That is, the column portion 14a having the opposed spherical portion 22 formed radially inward and the column portion 14b having the opposed spherical portion 23 formed radially outward are formed on the inner diameter side around the pitch circle P. Alternatingly arranged on the outer diameter side.

また、本発明の冠型保持器は、図示する形態に限らず本発明の範囲内において他の形態のものであっても良い。本発明では、一方の対向球面部２２の内の少なくとも爪部１７ａの内面が、ピッチ円Ｐに対して径方向内寄りに形成されていて、他方の対向球面部２３の内の少なくとも爪部１７ｂの内面が、ピッチ円Ｐに対して径方向外寄りに形成されていて、遠心力によって変形した場合に、爪部１７ｂの先端において、前記他方の対向球面部２３の内周部２３ａが玉３と非接触となるようにピッチ円Ｐから保持器内周面３４までの距離ｂ２が小さく設定されていればよい。   Further, the crown type cage of the present invention is not limited to the illustrated form, but may be of other forms within the scope of the present invention. In the present invention, at least the inner surface of the claw portion 17a in one opposing spherical surface portion 22 is formed radially inward with respect to the pitch circle P, and at least the claw portion 17b in the other opposing spherical surface portion 23. Is formed radially outward with respect to the pitch circle P, and when deformed by centrifugal force, the inner peripheral portion 23a of the other opposing spherical portion 23 is the ball 3 at the tip of the claw portion 17b. The distance b2 from the pitch circle P to the inner circumferential surface 34 of the cage may be set to be small so as to be non-contact.

本発明の冠型保持器が取り付けられた状態にある玉軸受の断面図である。It is sectional drawing of the ball bearing in the state to which the crown type holder | retainer of this invention was attached. 保持器の斜視図である。It is a perspective view of a holder | retainer. ポケットおよびその周辺部の説明図である。It is explanatory drawing of a pocket and its peripheral part. 玉および保持器を軸方向から見た説明図である。It is explanatory drawing which looked at the ball and the cage from the axial direction. （ａ）は、玉および保持器の玉周辺部を示している本発明の説明図であり、（ｂ）は、従来の保持器を説明している説明図である。(A) is explanatory drawing of this invention which shows the ball | bowl and the ball peripheral part of a holder | retainer, (b) is explanatory drawing explaining the conventional holder | retainer. 従来の保持器の説明図である。It is explanatory drawing of the conventional holder | retainer.

符号の説明Explanation of symbols

３ 玉
４ 冠形保持器
７ ポケット
２１ 底球面部
２２ 対向球面部
２３ 対向球面部
ｂ２ 保持器内周面からピッチ円までの距離
Ｐ ピッチ円 3 Ball 4 Crown-shaped cage 7 Pocket 21 Bottom spherical surface portion 22 Opposed spherical surface portion 23 Opposed spherical surface portion b2 Distance P from the inner peripheral surface of the cage to the pitch circle P Pitch circle

Claims (1)

軸方向一方側に開口し、ピッチ円上に設けられた複数の玉を転動自在に保持するポケットが周方向に複数形成された玉軸受用の冠型保持器において、
前記ポケットそれぞれは、当該ポケットの底となる底球面部と、この底球面部から開口側に相互が対向して形成されている一対の対向球面部と、を有し、
前記ポケットそれぞれにおける前記一対の対向球面部の内の一方は、前記ピッチ円に対して径方向内寄りに形成され、前記一対の対向球面部の内の他方は、前記ピッチ円に対して径方向外寄りに形成され、
遠心力によって変形した際に、前記他方の対向球面部の内周部が前記玉と非接触となるように当該他方の対向球面部側の保持器内周面から前記ピッチ円までの距離が設定されていることを特徴とする冠型保持器。 In the crown type cage for ball bearings, which is open on one side in the axial direction and has a plurality of pockets formed in the circumferential direction to hold a plurality of balls provided on the pitch circle in a freely rolling manner.
Each of the pockets has a bottom spherical surface portion serving as a bottom of the pocket, and a pair of opposed spherical surface portions formed so as to face each other from the bottom spherical surface portion to the opening side,
One of the pair of opposed spherical portions in each of the pockets is formed radially inward with respect to the pitch circle, and the other of the pair of opposed spherical portions is radial with respect to the pitch circle. Formed outside,
The distance from the inner peripheral surface of the other opposing spherical surface side to the pitch circle is set so that the inner peripheral portion of the other opposing spherical surface portion is not in contact with the ball when deformed by centrifugal force. A crown-type cage characterized by being made.
JP2008186287A 2008-07-17 2008-07-17 Crown type cage Expired - Fee Related JP5131068B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2008186287A JP5131068B2 (en) 2008-07-17 2008-07-17 Crown type cage

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Application Number Priority Date Filing Date Title
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0434512U (en) * 1990-07-19 1992-03-23
JP2002081450A (en) * 2000-09-07 2002-03-22 Ntn Corp Rotation-directional ball bearing
JP2003214436A (en) * 2002-01-21 2003-07-30 Koyo Seiko Co Ltd Holder for ball bearing and ball bearing
JP2003214437A (en) * 2002-01-18 2003-07-30 Koyo Seiko Co Ltd Ball bearing
JP2008051294A (en) * 2006-08-28 2008-03-06 Jtekt Corp Crown type cage

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0434512U (en) * 1990-07-19 1992-03-23
JP2002081450A (en) * 2000-09-07 2002-03-22 Ntn Corp Rotation-directional ball bearing
JP2003214437A (en) * 2002-01-18 2003-07-30 Koyo Seiko Co Ltd Ball bearing
JP2003214436A (en) * 2002-01-21 2003-07-30 Koyo Seiko Co Ltd Holder for ball bearing and ball bearing
JP2008051294A (en) * 2006-08-28 2008-03-06 Jtekt Corp Crown type cage

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