JP4082032B2 - Ball bearing cage and ball bearing - Google Patents

Ball bearing cage and ball bearing Download PDF

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Publication number
JP4082032B2
JP4082032B2 JP2002011699A JP2002011699A JP4082032B2 JP 4082032 B2 JP4082032 B2 JP 4082032B2 JP 2002011699 A JP2002011699 A JP 2002011699A JP 2002011699 A JP2002011699 A JP 2002011699A JP 4082032 B2 JP4082032 B2 JP 4082032B2
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Japan
Prior art keywords
ball
cage
ball bearing
elastic piece
pocket
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JP2002011699A
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JP2003214436A (en
Inventor
基司 河村
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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
    • F16C33/38—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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/38—Ball cages
    • F16C33/41—Ball cages comb-shaped
    • F16C33/418—Details of individual pockets, e.g. shape or ball retaining means

Description

【０００１】
【発明の属する技術分野】
本発明は、玉軸受用保持器及び玉軸受に関するものである。
【０００２】
【従来の技術】
保持器は、内輪と外輪の間に転動自在に設けられた複数の玉を一定の間隔で保つべく内外輪間で玉を転動自在に保持するためのものである。従来の保持器としては、図６に示すような、いわゆる冠型保持器がある。この冠型保持器は、円環状の保持器本体１０１の周方向の複数箇所に玉を転動自在に保持するポケット１０１ａが設けられて構成されている。保持器ポケット１０１ａは、玉を一つずつ抱持するべく凹状形成されており、保持器本体１０１の軸方向一端側から突設された爪１０２を備えている。
そして、保持器の材質としては、金属製もあるが、合成樹脂製の方が、高速回転時の温度上昇が少なく優れていることが知られている。
【０００３】
【発明が解決しようとする課題】
合成樹脂製の冠型保持器を高速回転（例えば、１５０００〜１８０００ｍ−１程度）で使用すると、保持器には遠心力による径外方向への変形力がかかる。遠心力がかかっても、保持器本体１０１は円環状であるから合成樹脂製であってもほとんど変形しないが、爪１０２は弾性変形する弾性片であり、遠心力によって保持器径外方向に向かって変形する。
【０００４】
このため、図７に示すように、ポケット１０１ａに保持された玉１０３に対して、爪１０２が径外方向に変形することとなり、爪１０２の径内側端のエッジ１０２ａが玉１０３と接触して玉とのつまりが生じ、発熱によって軸受が焼付くという問題が生じる。
【０００５】
ここで、高い回転速度での遠心力による保持器の変形を考慮したものとして、特開２００１−５０２８０号公報（以下、「先行技術文献」という。）に記載の保持器がある。しかし、先行技術文献の保持器は、玉が軸方向にガタつき易いという欠点がある。すなわち、先行技術文献の保持器では、爪（先行技術文献では「タブ」と呼ばれている）が、保持器の径方向内側部分にはなく、径方向外側部分にしかないため（図７参照）、爪（タブ）が遠心力によって径外方向に変形すると、爪（タブ）が玉を軸方向に押さえる機能が小さくなり、玉が軸方向にガタつき易くなる。
【０００６】
本発明は、かかる問題に鑑みてなされたものであり、高速回転よる保持器の変形による玉とのつまりを防止するとともに、玉の軸方向へのガタつきを防止した玉軸受用保持器及び玉軸受を提供することを目的とする。
【０００７】
【課題を解決するための手段】
本発明は、円環状の保持器本体の周方向の複数箇所に玉を転動自在に保持するポケットが設けられた玉軸受用保持器であって、前記ポケットは、前記保持器本体の軸方向一端側から突設された複数の弾性片と、隣接して対をなす弾性片間における前記保持器本体に凹状形成されたポケット本体部とを備え、前記弾性片は、前記ポケットに保持される玉中心を結んでなるピッチ円に対して径内外方向にまたがって形成され、当該弾性片の内側面は、前記ポケット本体部と連続した面で形成され、前記弾性片の幅は、当該保持器本体の幅と同一であり、前記弾性片の内側面のうち前記ピッチ円より径外側にある第１範囲、及び前記ポケット本体部は、保持される玉の表面形状に沿うように当該玉の中心からの距離が等しく形成された球状凹面であり、前記弾性片の内側面のうち前記ピッチ円より径内側にある第２範囲は、弾性片の突出方向先端側ほど対をなす他方の弾性片側へ近づくよう湾曲し、当該第２範囲の径内側端は、前記ポケットに保持される玉から離反して位置するよう、前記球状凹面に比べて保持される玉中心からの距離が大きくされていることを特徴とする。
【０００８】
本発明によると、第２範囲の径内端側、すなわち弾性片の径内端側、が玉から離反して位置しているので、弾性片が遠心力で径外方向に変形しても、弾性片の径内側端が玉と接触し難くなり、玉とのつまりが防止される。しかも、弾性片はピッチ円に対して径内外方向にまたがって形成され、径内側の第２範囲が突出方向先端側ほど対をなす他方の弾性片側へ近づくよう湾曲しているため、弾性片が径外方向に変形しても、玉が軸方向にガタつくことが防止される。
【０００９】
前記第２範囲としては、長手方向が保持器径方向に向けられ中心軸が前記玉の中心を通る仮想的な円筒体であって、当該円筒体の断面円の半径が前記玉の半径と略等しい円筒体の表面に沿った形状であるのが好ましい。
【００１０】
そして、内輪と外輪の間に転動自在に設けられた複数の玉を内外輪間で転動自在に保持する保持器を備えた玉軸受において、前記保持器として、前述の保持器を用いることで、保持器と玉とのつまりを防止して、玉軸受の焼付きを防止できる。
【００１１】
【発明の実施の形態】
以下、本発明の実施形態を図面に基づいて説明する。
図１〜図５は、実施形態に係る玉軸受用の保持器１を示している。この保持器１は、玉軸受の内輪と外輪の間に組み付けられ、内輪外周面に形成された内輪軌道面と、外輪内周面に形成された外輪軌道面との間に転動自在に配置される複数の玉を一定の間隔で保持するためのものである。この保持器１は、合成樹脂製であり、いわゆる冠型として構成されている。
【００１２】
保持器１は、円環状の保持器本体２を備え、この保持器本体２は、玉軸受外輪の内周面と対面する外周面部３と、玉軸受内輪の外周面と対面する内周面部４と、軸方向一端側の正面部５と、軸方向他端側の背面部６とを有している。
保持器本体２には、周方向に所定の間隔をおいて玉７を抱持するためのポケット８が設けられている。このポケット８は、保持器本体２の正面部５から軸方向に突設された複数の爪状の弾性片９，１０を備えている。複数の弾性片９，１０は、隣接する２つの弾性片同士が対をなしており、対の弾性片９，１０が、周方向に複数組備えられている。
【００１３】
また、ポケット８は、対の弾性片９，１０間における保持器本体２に凹状形成されたポケット本体部１２を備えている。ポケット本体部１２は、外周面部３側、内周面部４側、及び正面部５側が開口している。ポケット本体部１２は、玉７の表面形状に沿うように球状凹面として形成されている。すなわち、ポケット本体部１２の凹面は、玉７の中心Ｃからの距離が等しくされている。また、玉７の中心Ｃからポケット本体部１２の球状凹面までの距離は、玉７の半径と略等しいが、玉７の半径より僅かに大きくされており、玉７とポケット８間に僅かな隙間が確保されて玉７が円滑に転動する。
【００１４】
各弾性片９，１０は、径方向の幅が保持器本体２の幅と同一とされており、このため、弾性片９，１０は、ポケット８によって保持される複数の玉７の中心Ｃを結んでなるピッチ円ＰＣに対して径方向にまたがって存在している。
対の弾性片９，１０は、互いに対向する内側面１４，１５を有しており、これらの内側面１４，１５は、ピッチ円ＰＣより径外側の領域である第１範囲１４ａ，１５ａとピッチ円ＰＣより径内側の領域である第２範囲１４ｂ，１５ｂ（図２の網掛け部分）とでは、その表面形状が異なっている。なお、本発明においてピッチ円ＰＣの通る玉の中心Ｃの位置は厳密なものではなく、完全な玉中心Ｃだけでなくその近傍位置をも含む意である。
【００１５】
前記第１範囲１４ａ，１５ａは、ポケット本体部１２と同様に玉７の表面形状に沿った球状凹面であり、ポケット本体部１２の球状凹面と第１範囲１４ａ，１５ａの球状凹面は連続的に形成されて、玉７の半径と略同一の半径の仮想的な球体表面の一部をなす形状となっている。保持器１は、主にポケット本体部１２の球状凹面と第１範囲１４ａ，１５ａの球状凹面とによって、図５及び図６に示す従来の保持器と同様な回転方向（保持器周方向）へのガイド機能をもって、玉７を安定的に抱持する。
【００１６】
前記第２範囲１４ｂ，１５ｂは、仮想的な円筒体の表面の一部をなす形状であり、この仮想円筒体は、中心軸が玉７の中心Ｃを通るとともに長手方向が保持器径方向Ｒに向けられたものである。また、仮想円筒体の断面円の半径は、玉７の半径と略等しい。この第２範囲１４ｂ，１５ｂは、第１範囲１４ａ，１５ａと連続した面であり、対をなして向かい合う弾性片９，１０の第２範囲１４ｂ，１５ｂは、仮想円筒の一部を占めているため、保持器径方向（仮想円筒の軸方向）にみると、両第２範囲１４ｂ，１５ｂの間隔は略一定となっている。したがって、第２範囲１４ｂ，１５ｂの径内側端１７，１８は、第１範囲１４ａ，１５ａの球状凹面における玉中心Ｃからの距離Ａに比べて玉中心Ｃからの距離Ｂが大きく、弾性片９，１０の径内端側１７，１８は玉７と離反した位置にある。
【００１７】
本実施形態では、弾性片９，１０が以上のように構成されているため、玉軸受が高速で回転して、弾性片９，１０が径外方向に変形しても、弾性片９，１０の径内側端１７，１８が玉７と接触しないから、玉７とのつまりが発生せず、軸受の焼付きが生じない。
しかも、弾性片９，１０の第２範囲１４ｂ，１５ｂは、仮想円筒体の円周表面の一部を占めるように形成されているため、弾性片突出方向にみると他方の弾性片に近づくように玉７に沿って湾曲しており、弾性片９，１０が径外方向に変形しても、第２範囲１４ｂ、１５が玉７の保持器軸方向への移動を阻止するので、玉７の保持器軸方向へのガタつきが防止される。
【００１８】
なお、本発明は、上記実施形態に限定されるものではない。例えば、第２範囲の具体的形状は、特許請求の範囲の記載内で様々な変更が可能である。
【００１９】
【発明の効果】
本発明によると、第２範囲の径内端側、すなわち弾性片の径内端側、が玉から離反して位置しているので、弾性片が遠心力で径外方向に変形しても、弾性片の径内側端が玉と接触し難くなり、玉とのつまりが防止される。しかも、弾性片はピッチ円に対して径内外方向にまたがって形成され、径内側の第２範囲が突出方向先端側ほど対をなす他方の弾性片側へ近づくよう湾曲しているため、弾性片が径外方向に変形しても、玉が軸方向にガタつくことが防止される。
【図面の簡単な説明】
【図１】玉軸受用保持器の斜視図である。
【図２】図１のＩＩ−ＩＩ線断面図である。
【図３】ポケット部の平面図である。
【図４】図１のＩＶ−ＩＶ線断面図である。
【図５】従来の玉軸受用保持器の斜視図である。
【図６】従来の玉軸受用保持器のポケット部の平面図である。
【図７】先行技術文献のポケット部の平面図である。
【符号の説明】
１ 玉軸受用保持器
２ 保持器本体
８ ポケット
７ 玉
９ 弾性片
１０ 弾性片
１２ ポケット本体部
１４ 弾性片内側面
１４ａ 第１範囲
１４ｂ 第２範囲
１５ 弾性片内側面
１５ａ 第１範囲
１５ｂ 第２範囲
１７ 弾性片内側端（第２範囲内側端）
１８ 弾性片内側端（第２範囲内側端）
Ｃ 玉中心
ＰＣ ピッチ円
Ｒ 保持器径方向（仮想円筒体軸方向）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ball bearing cage and a ball bearing.
[0002]
[Prior art]
The cage is for holding the balls between the inner and outer rings so as to roll freely so as to keep a plurality of balls provided between the inner ring and the outer ring so as to be able to roll. As a conventional cage, there is a so-called crown type cage as shown in FIG. This crown-shaped cage is configured by providing pockets 101 a that hold balls freely at a plurality of locations in the circumferential direction of an annular cage body 101. The cage pocket 101a is formed in a concave shape so as to hold the balls one by one, and includes a claw 102 protruding from one end side in the axial direction of the cage body 101.
And although the material of the cage is also made of metal, it is known that the synthetic resin is superior in that the temperature rise during high-speed rotation is small.
[0003]
[Problems to be solved by the invention]
When a crown-shaped cage made of synthetic resin is used at high speed rotation (for example, about 15000 to 18000 m −1 ), the cage is subjected to a deforming force in the radially outward direction due to centrifugal force. Even when a centrifugal force is applied, the cage body 101 is annular, so even if it is made of synthetic resin, it hardly deforms. However, the claw 102 is an elastic piece that is elastically deformed, and the cage force is directed outward in the radial direction of the cage. And deform.
[0004]
For this reason, as shown in FIG. 7, the claw 102 is deformed in the radially outward direction with respect to the ball 103 held in the pocket 101 a, and the edge 102 a at the radially inner end of the claw 102 comes into contact with the ball 103. There is a problem that the ball is clogged and the bearing is seized by heat generation.
[0005]
Here, there is a cage described in Japanese Patent Application Laid-Open No. 2001-50280 (hereinafter referred to as “prior art document”) in consideration of deformation of the cage due to centrifugal force at a high rotational speed. However, the cage of the prior art document has a drawback that the balls are likely to play in the axial direction. That is, in the cage of the prior art document, the claw (called “tab” in the prior art document) is not in the radially inner portion of the cage but only in the radially outer portion (see FIG. 7). When the claw (tab) is deformed radially outward by centrifugal force, the function of the claw (tab) to hold the ball in the axial direction is reduced, and the ball is easily rattled in the axial direction.
[0006]
The present invention has been made in view of such a problem, and the ball bearing retainer and the ball which prevent clogging with a ball due to deformation of the cage due to high-speed rotation and prevent the ball from rattling in the axial direction are provided. An object is to provide a bearing.
[0007]
[Means for Solving the Problems]
The present invention is a ball bearing retainer provided with a pocket for rotatably holding balls at a plurality of locations in the circumferential direction of an annular retainer body, the pocket being in the axial direction of the retainer body A plurality of elastic pieces projecting from one end side, and a pocket main body portion formed in a concave shape in the cage main body between adjacent elastic pieces, and the elastic pieces are held in the pockets The inner surface of the elastic piece is formed by a surface continuous with the pocket main body part with respect to the pitch circle formed by connecting the ball centers, and the width of the elastic piece is determined by the cage. The first range that is the same as the width of the main body and that is radially outside the pitch circle of the inner surface of the elastic piece, and the pocket main body portion has a center of the ball along the surface shape of the held ball Is a spherical concave surface with an equal distance from The second range of the inner surface of the elastic piece that is radially inward of the pitch circle is curved so as to approach the other elastic piece side that forms a pair toward the distal end side in the protruding direction of the elastic piece. The end has a larger distance from the ball center held than the spherical concave surface so as to be located away from the ball held in the pocket.
[0008]
According to the present invention, the radially inner end side of the second range, that is, the radially inner end side of the elastic piece is located away from the ball, so even if the elastic piece is deformed radially outward by centrifugal force, The inner diameter end of the elastic piece becomes difficult to contact with the ball, and clogging with the ball is prevented. In addition, the elastic piece is formed so as to straddle the pitch circle in the radially inner and outer directions, and the second range on the inner side of the diameter is curved so as to approach the other elastic piece side that forms a pair toward the distal end side in the protruding direction. Even if it deforms in the radially outward direction, the ball is prevented from rattling in the axial direction.
[0009]
The second range is a virtual cylindrical body whose longitudinal direction is directed in the cage radial direction and whose central axis passes through the center of the ball, and the radius of the cross-sectional circle of the cylindrical body is substantially equal to the radius of the ball. A shape along the surface of an equal cylinder is preferred.
[0010]
And in the ball bearing provided with the holder | retainer which hold | maintains the some ball | bowl provided between the inner ring | wheel and the outer ring | wheel so that rolling was possible, using the above-mentioned cage | basket as said holder | retainer Thus, the cage and the ball can be prevented from clogging and the ball bearing can be prevented from seizing.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Drawing 1-Drawing 5 show cage 1 for ball bearings concerning an embodiment. The cage 1 is assembled between an inner ring and an outer ring of a ball bearing, and is disposed so as to be able to roll between an inner ring raceway surface formed on the outer peripheral surface of the inner ring and an outer ring raceway surface formed on the inner peripheral surface of the outer ring. This is for holding a plurality of balls to be held at regular intervals. The cage 1 is made of a synthetic resin and is configured as a so-called crown type.
[0012]
The cage 1 includes an annular cage body 2. The cage body 2 has an outer peripheral surface portion 3 facing the inner peripheral surface of the ball bearing outer ring and an inner peripheral surface portion 4 facing the outer peripheral surface of the ball bearing inner ring. And a front portion 5 on one end side in the axial direction and a back portion 6 on the other end side in the axial direction.
The cage body 2 is provided with pockets 8 for holding the balls 7 at a predetermined interval in the circumferential direction. The pocket 8 includes a plurality of claw-like elastic pieces 9 and 10 protruding in the axial direction from the front portion 5 of the cage body 2. The plurality of elastic pieces 9 and 10 are paired with two adjacent elastic pieces, and a plurality of pairs of elastic pieces 9 and 10 are provided in the circumferential direction.
[0013]
Further, the pocket 8 includes a pocket main body portion 12 formed in a concave shape in the cage main body 2 between the pair of elastic pieces 9 and 10. As for the pocket main-body part 12, the outer peripheral surface part 3 side, the inner peripheral surface part 4 side, and the front part 5 side are opening. The pocket main body 12 is formed as a spherical concave surface along the surface shape of the ball 7. That is, the distance from the center C of the ball 7 is made equal to the concave surface of the pocket main body 12. Further, the distance from the center C of the ball 7 to the spherical concave surface of the pocket main body 12 is substantially equal to the radius of the ball 7, but is slightly larger than the radius of the ball 7, and slightly between the ball 7 and the pocket 8. A clearance is secured and the ball 7 rolls smoothly.
[0014]
Each elastic piece 9, 10 has the same radial width as the width of the cage body 2. For this reason, the elastic pieces 9, 10 have the centers C of the balls 7 held by the pockets 8. It exists across the radial direction with respect to the connected pitch circle PC.
The pair of elastic pieces 9 and 10 have inner side surfaces 14 and 15 that face each other, and these inner side surfaces 14 and 15 are pitched with the first ranges 14a and 15a that are regions outside the pitch circle PC in the diameter. The surface shapes of the second ranges 14b and 15b (shaded portions in FIG. 2) that are regions on the inner side of the circle PC are different. In the present invention, the position of the center C of the ball through which the pitch circle PC passes is not strict, and includes not only the complete ball center C but also its vicinity.
[0015]
The first ranges 14a and 15a are spherical concave surfaces along the surface shape of the ball 7 like the pocket main body portion 12, and the spherical concave surfaces of the pocket main body portion 12 and the spherical concave surfaces of the first ranges 14a and 15a are continuous. It is formed and forms a part of a virtual spherical surface having a radius substantially the same as the radius of the ball 7. The cage 1 mainly rotates in the same rotational direction (cage circumferential direction) as the conventional cage shown in FIGS. 5 and 6 by the spherical concave surface of the pocket main body 12 and the spherical concave surfaces of the first ranges 14a and 15a. With this guide function, the ball 7 is stably held.
[0016]
Said 2nd range 14b, 15b is a shape which makes a part of surface of a virtual cylinder, and this virtual cylinder passes along the center C of the ball 7, and a longitudinal direction is cage radial direction R. It is aimed at. Further, the radius of the cross-sectional circle of the virtual cylinder is substantially equal to the radius of the ball 7. The second ranges 14b and 15b are continuous surfaces with the first ranges 14a and 15a, and the second ranges 14b and 15b of the elastic pieces 9 and 10 facing each other in a pair occupy a part of the virtual cylinder. Therefore, when viewed in the cage radial direction (the axial direction of the virtual cylinder), the distance between the second ranges 14b and 15b is substantially constant. Accordingly, the radially inner ends 17 and 18 of the second ranges 14b and 15b have a larger distance B from the ball center C than the distance A from the ball center C in the spherical concave surfaces of the first ranges 14a and 15a, and the elastic piece 9 , in the radially inward end 1 7, 18 of 10 were separated and the ball 7 position.
[0017]
In the present embodiment, since the elastic pieces 9 and 10 are configured as described above, even if the ball bearing rotates at a high speed and the elastic pieces 9 and 10 are deformed in the radially outward direction, the elastic pieces 9 and 10 are formed. Since the inner diameter ends 17 and 18 do not come into contact with the balls 7, the clogging with the balls 7 does not occur, and the seizure of the bearing does not occur.
In addition, since the second ranges 14b and 15b of the elastic pieces 9 and 10 are formed so as to occupy a part of the circumferential surface of the virtual cylindrical body, they approach the other elastic piece when viewed in the elastic piece protruding direction. Since the second ranges 14b and 15 prevent the movement of the ball 7 in the cage axial direction even if the elastic pieces 9 and 10 are deformed in the radially outward direction, the ball 7 The backlash in the cage axial direction is prevented.
[0018]
The present invention is not limited to the above embodiment. For example, the specific shape of the second range can be variously changed within the scope of the claims.
[0019]
【The invention's effect】
According to the present invention, the radially inner end side of the second range, that is, the radially inner end side of the elastic piece is located away from the ball, so even if the elastic piece is deformed radially outward by centrifugal force, The inner diameter end of the elastic piece becomes difficult to contact with the ball, and clogging with the ball is prevented. In addition, the elastic piece is formed so as to straddle the pitch circle in the radially inner and outer directions, and the second range on the inner side of the diameter is curved so as to approach the other elastic piece side that forms a pair toward the distal end side in the protruding direction. Even if it deforms in the radially outward direction, the ball is prevented from rattling in the axial direction.
[Brief description of the drawings]
FIG. 1 is a perspective view of a ball bearing retainer.
FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
FIG. 3 is a plan view of a pocket portion.
4 is a cross-sectional view taken along line IV-IV in FIG.
FIG. 5 is a perspective view of a conventional ball bearing retainer.
FIG. 6 is a plan view of a pocket portion of a conventional ball bearing retainer.
FIG. 7 is a plan view of a pocket portion of a prior art document.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Ball bearing cage 2 Cage body 8 Pocket 7 Ball 9 Elastic piece 10 Elastic piece 12 Pocket body 14 Elastic piece inner side surface 14a First range 14b Second range 15 Elastic piece inner side surface 15a First range 15b Second range 17 Elastic piece inner end (second range inner end)
18 Elastic piece inner edge (second range inner edge)
C Ball center PC Pitch circle R Cage radial direction (virtual cylinder axis direction)

Claims (3)

円環状の保持器本体の周方向の複数箇所に玉を転動自在に保持するポケットが設けられた玉軸受用保持器であって、前記ポケットは、前記保持器本体の軸方向一端側から突設された複数の弾性片と、隣接して対をなす弾性片間における前記保持器本体に凹状形成されたポケット本体部とを備え、前記弾性片は、前記ポケットに保持される玉中心を結んでなるピッチ円に対して径内外方向にまたがって形成され、当該弾性片の内側面は、前記ポケット本体部と連続した面で形成され、前記弾性片の幅は、当該保持器本体の幅と同一であり、前記弾性片の内側面のうち前記ピッチ円より径外側にある第１範囲、及び前記ポケット本体部は、保持される玉の表面形状に沿うように当該玉の中心からの距離が等しく形成された球状凹面であり、前記弾性片の内側面のうち前記ピッチ円より径内側にある第２範囲は、弾性片の突出方向先端側ほど対をなす他方の弾性片側へ近づくよう湾曲し、当該第２範囲の径内側端は、前記ポケットに保持される玉から離反して位置するよう、前記球状凹面に比べて保持される玉中心からの距離が大きくされていることを特徴とする玉軸受用保持器。A ball bearing retainer provided with pockets for rollingly retaining balls at a plurality of circumferential positions of an annular retainer body, the pocket projecting from one axial end of the retainer body. A plurality of elastic pieces provided, and a pocket main body formed in a concave shape in the cage main body between adjacent elastic pieces, and the elastic pieces connect ball centers held in the pockets. The inner surface of the elastic piece is formed by a surface continuous with the pocket main body, and the width of the elastic piece is the same as the width of the cage main body. The first range that is the same and is radially outside the pitch circle of the inner surface of the elastic piece, and the pocket main body has a distance from the center of the ball so as to follow the surface shape of the ball to be held. A spherical concave surface formed equally, the bullet Of the inner side surface of the piece, the second range that is radially inward from the pitch circle is curved so as to approach the other elastic piece side that forms a pair toward the leading end side in the protruding direction of the elastic piece, and the inner diameter end of the second range is A ball bearing retainer characterized in that the distance from the center of the ball held is larger than that of the spherical concave surface so that the ball is held away from the ball held in the pocket. 前記第２範囲は、長手方向が保持器径方向に向けられ中心軸が前記玉の中心を通る仮想的な円筒体であって、当該円筒体の断面円の半径が前記玉の半径と略等しい円筒体の表面に沿った形状であることを特徴とする請求項１記載の玉軸受用保持器。The second range is a virtual cylinder whose longitudinal direction is oriented in the cage radial direction and whose central axis passes through the center of the ball, and the radius of the cross-sectional circle of the cylinder is substantially equal to the radius of the ball cage for a ball bearing of claim 1 Symbol mounting, characterized in that a shape along the surface of the cylinder. 内輪と外輪の間に転動自在に設けられた複数の玉を内外輪間で転動自在に保持する保持器を備えた玉軸受において、
前記保持器は、請求項１又は２のいずれかに記載の玉軸受用保持器であることを特徴とする玉軸受。In a ball bearing provided with a cage that holds a plurality of balls provided between an inner ring and an outer ring so as to roll freely between the inner ring and the outer ring,
3. The ball bearing according to claim 1, wherein the cage is the ball bearing cage according to claim 1.
JP2002011699A 2002-01-21 2002-01-21 Ball bearing cage and ball bearing Expired - Fee Related JP4082032B2 (en)

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Application Number Priority Date Filing Date Title
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Cited By (1)

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US7965612B2 (en) 2004-11-15 2011-06-21 Panasonic Corporation Optical head, and information recording-and-regeneration apparatus

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JP5146269B2 (en) * 2007-11-07 2013-02-20 日本精工株式会社 Ball bearing
JP5500778B2 (en) * 2008-03-24 2014-05-21 Ｎｔｎ株式会社 Ball bearing cage
WO2009116295A1 (en) * 2008-03-21 2009-09-24 Ntn株式会社 Retainer for ball bearing, ball bearing with the retainer, and method of manufacturing the retainer
JP5131068B2 (en) * 2008-07-17 2013-01-30 株式会社ジェイテクト Crown type cage
JP5661410B2 (en) * 2010-10-07 2015-01-28 Ntn株式会社 Ball bearing cage and ball bearing
JP2016180436A (en) * 2015-03-23 2016-10-13 日本精工株式会社 Crown type holder, ball bearing and bearing unit
JP6940993B2 (en) * 2017-07-25 2021-09-29 Ntn株式会社 Rolling bearing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7965612B2 (en) 2004-11-15 2011-06-21 Panasonic Corporation Optical head, and information recording-and-regeneration apparatus

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