JP2010025199A - Crown type retainer - Google Patents

Crown type retainer Download PDF

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Publication number
JP2010025199A
JP2010025199A JP2008186168A JP2008186168A JP2010025199A JP 2010025199 A JP2010025199 A JP 2010025199A JP 2008186168 A JP2008186168 A JP 2008186168A JP 2008186168 A JP2008186168 A JP 2008186168A JP 2010025199 A JP2010025199 A JP 2010025199A
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Prior art keywords
ball
pocket
spherical surface
cage
balls
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JP2008186168A
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Japanese (ja)
Inventor
Tomoyuki Aida
友之 合田
Mitsuru Ueda
満 上田
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JTEKT Corp
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JTEKT Corp
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Priority to JP2008186168A priority Critical patent/JP2010025199A/en
Publication of JP2010025199A publication Critical patent/JP2010025199A/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30Parts of ball or roller bearings
    • F16C33/66Special parts or details in view of lubrication
    • F16C33/6637Special parts or details in view of lubrication with liquid lubricant
    • F16C33/664Retaining the liquid in or near the bearing
    • F16C33/6651Retaining the liquid in or near the bearing in recesses or cavities provided in retainers, races or rolling elements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30Parts of ball or roller bearings
    • F16C33/38Ball cages
    • F16C33/41Ball cages comb-shaped
    • F16C33/412Massive or moulded comb cages, e.g. snap ball cages
    • F16C33/414Massive or moulded comb cages, e.g. snap ball cages formed as one-piece cages, i.e. monoblock comb cages
    • F16C33/416Massive 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30Parts of ball or roller bearings
    • F16C33/38Ball cages
    • F16C33/41Ball cages comb-shaped
    • F16C33/418Details of individual pockets, e.g. shape or ball retaining means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04Bearings 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
    • F16C19/06Bearings 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 capable of eliminating the deficiency of a lubricating oil and capable of retaining balls in a good condition. <P>SOLUTION: To retain a plurality of balls 3 of a ball bearing rotatably freely, a plurality of pockets 7 opened to one side in the axial direction are formed in the circumferential direction. A plurality of recessed parts 7 for retaining the lubricating oil are formed on at least the inside circumferential side parts on the inner surfaces 9 of the pockets 7. <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、対向する対の爪部43が設けられており、これら対の爪部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 opposing claw portions 43 are provided in the portion where the pocket 42 is formed, and the pair of claw portions 43 prevents the balls 41 arranged 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、このような問題点を解消するために、保持器のポケットを内径側へ向かって漸次広くなるように形成したものがある(特許文献1参照)。
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 ball 41 remains arranged on the pitch circle in the ball bearing, the inner peripheral portion 44 of each of the claw portions 43 on both sides approaches the ball 41 and further contacts locally by the deformation, 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, in order to solve such a problem, there is one in which the pocket of the cage is formed so as to gradually become wider toward the inner diameter side (see Patent Document 1).

特開2001−116051号公報(図2参照)JP 2001-116051 (see FIG. 2)

特許文献1に記載の保持器によれば、潤滑油が内径側からポケットへ入りやすい構成となるが、玉を、主に保持器の外周側の部分で保持するため、当該外周側の部分が偏って摩耗するおそれがあり、また、ポケットの内面は、玉の外周面(球面)に沿った形状でないことから、保持器全体として玉を保持する機能が弱いという問題点がある。   According to the cage described in Patent Document 1, the lubricating oil easily enters the pocket from the inner diameter side. However, since the ball is mainly held by the outer peripheral side portion of the cage, the outer peripheral side portion is There is a possibility that it will be worn unevenly, and since the inner surface of the pocket is not shaped along the outer peripheral surface (spherical surface) of the ball, there is a problem that the function of holding the ball as a whole is weak.

そこで、本発明は、潤滑油不足を解消することができ、玉を良好な状態で保持することができる冠型保持器を提供することを目的とする。   Then, an object of this invention is to provide the crown type holder | retainer which can eliminate lack of lubricating oil and can hold | maintain a ball | bowl in a favorable state.

前記目的を達成するための本発明の冠型保持器は、玉軸受の複数の玉を転動自在に保持すべく、軸方向一方側に開口しているポケットが周方向に複数形成された冠型保持器において、前記ポケットの内面の少なくとも内周側部分に、潤滑油を溜めるための凹部が複数形成されている。   In order to achieve the above object, a crown type cage of the present invention is a crown in which a plurality of pockets open in one axial direction are formed in the circumferential direction so as to rollably hold a plurality of balls of a ball bearing. In the mold cage, a plurality of recesses for storing lubricating oil are formed on at least an inner peripheral side portion of the inner surface of the pocket.

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、冠型保持器に遠心力が作用する。この遠心力によって冠型保持器が変形することで、ポケットの内面の内の内周側部分が玉に接触したとしても、当該内周側部分に形成された凹部に潤滑油を溜めることができるので、この凹部内に溜められた潤滑油が玉との間に供給され、玉における潤滑油切れを防止することができる。さらに、前記遠心力によって、ポケットの内周側部分と玉とが接触したとしても、当該内周側部分に凹部が形成されていることから、玉との接触面積を減らすことができ、摩擦抵抗の増加を防止することができる。このように、玉との間の潤滑油切れを防止することができると共に、玉との間で生じる摩擦抵抗の増加を防止することができるので、玉を良好な状態で保持することができる。   According to the present invention, when the ball bearing rotates, the crown cage also rotates, and centrifugal force acts on the crown cage. By deforming the crown-shaped cage by this centrifugal force, even if the inner peripheral side portion of the inner surface of the pocket comes into contact with the ball, the lubricating oil can be stored in the concave portion formed in the inner peripheral side portion. Therefore, the lubricating oil stored in the recess is supplied between the balls, and it is possible to prevent the lubricating oil from running out of the balls. Furthermore, even if the inner peripheral side portion of the pocket and the ball come into contact with each other due to the centrifugal force, since the concave portion is formed in the inner peripheral side portion, the contact area with the ball can be reduced, and the frictional resistance can be reduced. Can be prevented from increasing. In this way, it is possible to prevent running out of lubricating oil between the balls and to prevent an increase in frictional resistance generated between the balls, so that the balls can be held in a good state.

また、前記ポケットの内面は、保持する前記玉を中心とし当該玉の半径よりも大きい半径を有する球面に沿って形成され、かつ、当該ポケットの内面は、前記玉の内の径方向外側の半球部の一部と対向する外周側球面と、当該玉の径方向内側の半球部の一部と対向する内周側球面とを有し、当該内周側球面の面積は当該外周側球面の面積よりも狭くなっているのが好ましい。
前記のとおり遠心力によって冠型保持器が変形すると、従来の保持器では、ポケットの内面の内周側部分は、玉と接近する方向へ変形するが、本発明によれば、内周側球面の面積を外周側球面の面積よりも狭くしているので、前記遠心力によって玉と接近する部分を減らすことができ、内周側球面によって潤滑油が掻き取られにくくすることができる。さらに、狭くする内周側球面に対して外周側球面を広くしていることで、ポケットの内面の総面積を確保しつつ、ポケットの内面は、保持する玉を中心としかつ当該玉よりも半径が大きい曲面に沿って形成されているので、玉をポケット内面の全体で保持することができ、玉を保持する機能の低下を防ぐことができる。
The inner surface of the pocket is formed along a spherical surface centered on the ball to be held and having a radius larger than the radius of the ball, and the inner surface of the pocket is a hemisphere radially outside the ball. An outer peripheral spherical surface that opposes a part of the portion and an inner peripheral spherical surface that opposes a part of the hemispherical portion on the radially inner side of the ball, and the area of the inner peripheral spherical surface is the area of the outer peripheral spherical surface It is preferable to be narrower.
As described above, when the crown-shaped cage is deformed by the centrifugal force, in the conventional cage, the inner circumferential side portion of the inner surface of the pocket is deformed in a direction approaching the ball, but according to the present invention, the inner circumferential spherical surface is deformed. Is smaller than the area of the outer peripheral spherical surface, the portion approaching the ball by the centrifugal force can be reduced, and the lubricating oil can be hardly scraped off by the inner peripheral spherical surface. Furthermore, the outer peripheral spherical surface is made wider than the inner peripheral spherical surface to be narrowed, so that the total area of the inner surface of the pocket is secured, while the pocket inner surface is centered on the ball to be held and has a radius larger than that of the ball. Is formed along a large curved surface, the ball can be held by the entire inner surface of the pocket, and the deterioration of the function of holding the ball can be prevented.

本発明によれば、ポケットの内面の内周側部分に形成された凹部により、玉との間の潤滑油切れを防止することができると共に、玉との間で生じる摩擦抵抗の増加を防止することができるので、玉を良好な状態で保持することができる。この結果、玉軸受および冠型保持器の寿命が短くなることを防ぐことができる。   According to the present invention, the recess formed in the inner peripheral portion of the inner surface of the pocket can prevent the lubricating oil from running out of the ball, and also prevents an increase in the frictional resistance generated between the ball and the ball. As a result, the balls can be held in a good state. As a result, it is possible to prevent the life of the ball bearing and the crown cage from being shortened.

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、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 further provided on one side of each column portion 14 in the axial direction so as to protrude further 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、保持器4のポケット7およびその周辺部を、ポケット7の開口部側から見た拡大図であり、図4はその断面図(図3のIV矢視の断面図)である。ポケット7の内面(以下、ポケット内面9という)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。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7に転動自在として収容させた玉3の中心点と一致する。   3 is an enlarged view of the pocket 7 of the retainer 4 and its peripheral portion as viewed from the opening side of the pocket 7, and FIG. 4 is a cross-sectional view thereof (a cross-sectional view taken along arrow IV in FIG. 3). The inner surface of the pocket 7 (hereinafter referred to as the pocket inner surface 9) has a shape along a spherical surface having a curvature radius r2 slightly larger than the curvature radius r1 of the ball 3 with the point C0 as the center. 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 disposed on the pitch circle P, and is the center point of the ball 3 accommodated in the pocket 7 as being rollable. Matches.

図4において、本発明の保持器4では、各ポケット内面9の少なくとも内周側部分に凹部10が複数形成されている。ポケット内面9について、および、凹部10の位置について具体的に説明すると、各ポケット内面9は、その全ての範囲において、(前記のとおり)保持する玉3を中心としかつ当該玉3の半径よりも僅かに大きい半径を有する球面に沿って形成されている。そして、このポケット内面9は、玉3の内のピッチ円Pよりも外周側(径方向外側)の半球部3aの一部と対向する外周側球面21と、当該玉3のピッチ円Pよりも内周側(径方向内側)の半球部3bの一部と対向する内周側球面22とを有している。これら外周側球面21および内周側球面22によって、一つのポケット内面9が構成されている。そして、このポケット内面9の内の内周側球面22に、前記凹部10が形成されている。   In FIG. 4, in the cage 4 of the present invention, a plurality of recesses 10 are formed on at least the inner peripheral side portion of each pocket inner surface 9. The pocket inner surface 9 and the position of the recess 10 will be described in detail. Each pocket inner surface 9 is centered on the ball 3 to be held (as described above) in the entire range and is more than the radius of the ball 3. It is formed along a spherical surface having a slightly larger radius. The pocket inner surface 9 has an outer peripheral spherical surface 21 that faces a part of the hemispherical portion 3 a on the outer peripheral side (radially outer side) than the pitch circle P in the ball 3 and the pitch circle P of the ball 3. It has an inner peripheral spherical surface 22 that faces a part of the hemispherical portion 3b on the inner peripheral side (radially inner side). The outer peripheral spherical surface 21 and the inner peripheral spherical surface 22 constitute one pocket inner surface 9. The recess 10 is formed in the inner peripheral spherical surface 22 of the pocket inner surface 9.

凹部10は、ポケット内面9の内周側縁部に並んで形成されている。各凹部10は、玉3(半球部3b)に向かって開口している凹溝からなり、溝方向は保持器4の外周側へ向かう方向である。凹部(凹溝)10の内径側端部10bは、保持器内周面31で開口しているが、凹部(凹溝)10の外径側端部10aは、前記外周側球面21まで達しておらず、前記内周側球面22の範囲内に存在している。また、図4において、複数の凹部10が内周側球面22に並んで設けられているが、この内周側球面22の内の少なくとも前記爪部17a(17b)の内面に、凹部10は形成されていればよい。なお、図4の形態では、柱部14の内面にも、凹部10が形成されている。   The recess 10 is formed side by side on the inner peripheral side edge of the pocket inner surface 9. Each recessed part 10 consists of a recessed groove opened toward the ball 3 (hemispherical part 3 b), and the groove direction is a direction toward the outer peripheral side of the cage 4. The inner diameter side end portion 10 b of the recess (concave groove) 10 opens at the cage inner peripheral surface 31, but the outer diameter side end portion 10 a of the recess (concave groove) 10 reaches the outer peripheral side spherical surface 21. It exists in the range of the inner peripheral spherical surface 22. In FIG. 4, a plurality of recesses 10 are provided side by side on the inner peripheral spherical surface 22. The recesses 10 are formed at least on the inner surface of the claw portion 17 a (17 b) of the inner peripheral spherical surface 22. It only has to be done. In the embodiment shown in FIG. 4, the recess 10 is also formed on the inner surface of the column portion 14.

また、本発明の保持器4は、当該保持器4の板厚中心線Q(図3参照)が、玉3のピッチ円Pに対して外周側に位置ずれしている。すなわち、図3において、玉3のピッチ円Pから保持器内周面31までの距離aは、ピッチ円Pから保持器外周面32までの距離bよりも小さく設定されている(a<b)。この構成により、ポケット内面9の内の内周側球面22の面積は、外周側球面21の面積よりも狭くなり、また、ポケット開口端18a,18bにおいて、内径側の開口寸法Eは、外径側の開口寸法Fよりも大きくなっている(E>F)。   In the cage 4 of the present invention, the plate thickness center line Q (see FIG. 3) of the cage 4 is displaced to the outer peripheral side with respect to the pitch circle P of the balls 3. That is, in FIG. 3, the distance a from the pitch circle P of the ball 3 to the cage inner circumferential surface 31 is set smaller than the distance b from the pitch circle P to the cage outer circumferential surface 32 (a <b). . With this configuration, the area of the inner peripheral spherical surface 22 in the pocket inner surface 9 is smaller than the area of the outer peripheral spherical surface 21, and the opening dimension E on the inner diameter side of the pocket opening ends 18 a and 18 b is the outer diameter. It is larger than the opening dimension F on the side (E> F).

この実施の形態によれば、玉軸受が回転すると保持器4も回転し、保持器4に遠心力が作用する。この遠心力によって、保持器4が外周側へ変形することでポケット内面9の内周側球面22が玉3に接触したとしても、当該内周側球面22に形成された凹部10に、玉軸受内に供給されている潤滑油(グリース)を溜めることができるので、この凹部10内に溜められた潤滑油が玉3との間に供給され、玉3における潤滑油切れを防止することができる。さらに、前記遠心力によって、ポケット内面9の内周側球面22と玉3とが接触したとしても、当該内周側球面22には凹部10が形成されていることから、玉3との接触面積を減らすことができ、摩擦抵抗の増加を防止することができる。このように、玉3との間の潤滑油切れを防止することができると共に、玉3との間で生じる摩擦抵抗の増加を防止することができるので、玉3を良好な状態で保持することができる。   According to this embodiment, when the ball bearing rotates, the cage 4 also rotates, and a centrifugal force acts on the cage 4. Even if the inner peripheral spherical surface 22 of the pocket inner surface 9 comes into contact with the ball 3 due to the cage 4 being deformed to the outer peripheral side by this centrifugal force, the ball bearing is formed in the concave portion 10 formed on the inner peripheral spherical surface 22. Since the lubricating oil (grease) supplied inside can be stored, the lubricating oil stored in the recess 10 is supplied between the balls 3 and the lubricating oil in the balls 3 can be prevented from running out. . Furthermore, even if the inner peripheral spherical surface 22 of the pocket inner surface 9 and the ball 3 come into contact with each other due to the centrifugal force, the inner peripheral spherical surface 22 is formed with the concave portion 10. Can be reduced, and an increase in frictional resistance can be prevented. In this way, it is possible to prevent running out of lubricating oil between the balls 3 and to prevent an increase in frictional resistance generated between the balls 3, so that the balls 3 can be held in a good state. Can do.

図6(a)に示しているように、従来の保持器40では、ポケット内面の内周側部分は、径方向外側を向く部分50を広く有しているため、遠心力によって保持器40が拡径するように変形すると、この径方向外側を向く部分50は玉41と接近するが(接触しようとするが)、本発明の前記実施形態によれば(図3参照)、内周側球面22の面積を外周側球面21の面積よりも狭くしていることで、径方向外側を向く部分は狭く(ほとんど無く)、遠心力によって玉3と接近する部分を減らすことができ、ポケット7の内周側球面22によって潤滑油が掻き取られにくくすることができる。
さらに、狭くする内周側球面22に対して外周側球面21を広くしていることで、ポケット内面9の総面積を確保しつつ、ポケット内面9は、保持する玉3を中心としかつ当該玉3よりも半径が僅かに大きい曲面に沿って形成されているので、玉3をポケット内面9の全体で保持することができ、玉を保持する機能の低下を防ぐことができる。
As shown in FIG. 6 (a), in the conventional retainer 40, the inner peripheral side portion of the pocket inner surface has a wide portion 50 that faces the radially outer side. When deformed so as to expand, the radially outward portion 50 approaches the ball 41 (but attempts to contact), but according to the embodiment of the present invention (see FIG. 3), the inner peripheral spherical surface By making the area of 22 smaller than the area of the outer peripheral spherical surface 21, the part facing outward in the radial direction is narrow (nearly absent), and the part approaching the ball 3 by centrifugal force can be reduced. The inner peripheral spherical surface 22 can make it difficult for the lubricating oil to be scraped off.
Further, by making the outer peripheral spherical surface 21 wider than the inner peripheral spherical surface 22 to be narrowed, the pocket inner surface 9 is centered on the retained ball 3 and the ball inner surface 9 while ensuring the total area of the pocket inner surface 9. Since the ball 3 is formed along a curved surface having a slightly larger radius than 3, the ball 3 can be held by the entire pocket inner surface 9, and a decrease in the function of holding the ball can be prevented.

以上より、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(図6参照)、対の爪部43の内周部44が玉41に局部的に接触し、玉41に形成されている油膜が掻き取られ、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る。この結果、本発明によれば、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止することができ、玉軸受および保持器4の寿命が短くなることを防ぐことができる。   As described above, 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 (see FIG. 6). It is possible to prevent the inner peripheral portion 44 of the pair of claw portions 43 from contacting the balls 41 locally, scraping off the oil film formed on the balls 41, and deteriorating the lubrication state of the ball bearings. As a result, according to the present invention, it is possible to prevent the cage 4 from being locally worn out or the ball bearing from being seized, and to prevent the life of the ball bearing and the cage 4 from being shortened. .

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、ポケット内面9の内周側部分(内周側球面22)に凹部10が複数形成されている場合を説明したが、この凹部10は、ポケット内面9の少なくとも内周側部分(内周側球面22の一部)に形成されていればよく、(図示しないが)凹部10(凹溝)は、内周側球面22から外周側球面21の一部にまで延びて形成されていれもよい。この場合、(図3と図4を参考にして説明すると)凹部(凹溝)10の内径側端部10bは、前記実施形態と同様に、保持器内周面31で開口しており、外径側端部10aは、前記保持器外周面32まで達しておらず、前記外周側球面21の途中部に存在している。   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, the case where a plurality of recesses 10 are formed in the inner peripheral side portion (inner peripheral side spherical surface 22) of the pocket inner surface 9 has been described. The concave portion 10 (concave groove) may be formed so as to extend from the inner peripheral spherical surface 22 to a part of the outer peripheral spherical surface 21 (not shown). Also good. In this case (as will be described with reference to FIGS. 3 and 4), the inner diameter side end portion 10b of the concave portion (concave groove) 10 is opened at the inner peripheral surface 31 of the cage as in the above embodiment, The diameter-side end portion 10 a does not reach the outer peripheral surface 32 of the cage and exists in the middle of the outer peripheral-side spherical surface 21.

また、前記凹部10を凹溝によって構成する以外として、図5に示しているように、凹部10をスリットによって構成してもよい。つまり、スリットである凹部10は、保持器内周面31で開口していると共に、爪部17a(17b)をポケット7の内外で貫通している。なお、図5では、ポケット内面9の内の爪部17a(17b)の内面に形成されている凹部10が、スリットによって構成されていて、ポケット内面9の内の柱部14の内面に形成されている凹部10は、凹溝によって構成されている。   Moreover, as shown in FIG. 5, you may comprise the recessed part 10 with a slit except having comprised the said recessed part 10 with a recessed groove. That is, the concave portion 10 that is a slit opens at the inner peripheral surface 31 of the cage and penetrates the claw portion 17 a (17 b) inside and outside the pocket 7. In FIG. 5, the recess 10 formed on the inner surface of the claw portion 17 a (17 b) in the pocket inner surface 9 is formed by a slit and is formed on the inner surface of the column portion 14 in the pocket inner surface 9. The recessed part 10 is constituted by a recessed groove.

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. 保持器のポケットおよびその周辺部を、ポケットの開口部側から見た拡大図である。It is the enlarged view which looked at the pocket and its peripheral part of the holder | retainer from the opening part side of the pocket. 図3のIV矢視の断面図である。It is sectional drawing of the IV arrow of FIG. 他の実施形態の冠型保持器の断面図である。It is sectional drawing of the crown type holder | retainer of other embodiment. 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
3a 径方向外側の半球部
3b 径方向内側の半球部
4 冠形保持器
7 ポケット
9 ポケット内面
10 凹部
21 外周側球面
22 内周側球面
3 Ball 3a Semi-spherical portion 3b radially outer hemispherical portion 4 Radial inner hemispherical portion 4 Crown-shaped cage 7 Pocket 9 Pocket inner surface 10 Recess 21 Outer spherical surface 22 Inner circumferential spherical surface

Claims (2)

玉軸受の複数の玉を転動自在に保持すべく、軸方向一方側に開口しているポケットが周方向に複数形成された冠型保持器において、
前記ポケットの内面の少なくとも内周側部分に、潤滑油を溜めるための凹部が複数形成されていることを特徴とする冠型保持器。
In a crown type cage in which a plurality of pockets opened on one side in the axial direction are formed in the circumferential direction in order to hold a plurality of balls of a ball bearing in a freely rolling manner,
A crown type retainer, wherein a plurality of recesses for storing lubricating oil are formed in at least an inner peripheral side portion of the inner surface of the pocket.
前記ポケットの内面は、保持する前記玉を中心とし当該玉の半径よりも大きい半径を有する球面に沿って形成され、かつ、当該ポケットの内面は、前記玉の内の径方向外側の半球部の一部と対向する外周側球面と、当該玉の径方向内側の半球部の一部と対向する内周側球面とを有し、当該内周側球面の面積は当該外周側球面の面積よりも狭くなっている請求項1に記載の冠型保持器。   The inner surface of the pocket is formed along a spherical surface centered on the ball to be held and having a radius larger than the radius of the ball, and the inner surface of the pocket is a radially outer hemispherical portion of the ball. An outer peripheral spherical surface facing a part and an inner peripheral spherical surface facing a part of a radially inner hemispherical portion of the ball, the area of the inner peripheral spherical surface being larger than the area of the outer peripheral spherical surface The crown type retainer according to claim 1, which is narrowed.
JP2008186168A 2008-07-17 2008-07-17 Crown type retainer Pending JP2010025199A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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JP2008186168A JP2010025199A (en) 2008-07-17 2008-07-17 Crown type retainer

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012052615A (en) * 2010-09-02 2012-03-15 Ntn Corp Sealed rolling bearing
CN103727132A (en) * 2012-10-12 2014-04-16 Skf公司 Cage for a rolling bearing, notably for a motor vehicle electric power steering bearing
JP7088286B2 (en) 2018-06-06 2022-06-21 日本精工株式会社 Ball bearings
US20220333645A1 (en) * 2021-04-16 2022-10-20 Kabushiki Kaisha Toyota Chuo Kenkyusho Ball bearing
WO2023095639A1 (en) * 2021-11-29 2023-06-01 Ntn株式会社 Rolling bearing

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012052615A (en) * 2010-09-02 2012-03-15 Ntn Corp Sealed rolling bearing
CN103727132A (en) * 2012-10-12 2014-04-16 Skf公司 Cage for a rolling bearing, notably for a motor vehicle electric power steering bearing
JP7088286B2 (en) 2018-06-06 2022-06-21 日本精工株式会社 Ball bearings
US20220333645A1 (en) * 2021-04-16 2022-10-20 Kabushiki Kaisha Toyota Chuo Kenkyusho Ball bearing
US11585377B2 (en) * 2021-04-16 2023-02-21 Kabushiki Kaisha Toyota Chuo Kenkyusho Ball bearing
WO2023095639A1 (en) * 2021-11-29 2023-06-01 Ntn株式会社 Rolling bearing

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