JP4642712B2 - Resin crown type cage and ball bearing - Google Patents

Resin crown type cage and ball bearing Download PDF

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JP4642712B2
JP4642712B2 JP2006195930A JP2006195930A JP4642712B2 JP 4642712 B2 JP4642712 B2 JP 4642712B2 JP 2006195930 A JP2006195930 A JP 2006195930A JP 2006195930 A JP2006195930 A JP 2006195930A JP 4642712 B2 JP4642712 B2 JP 4642712B2
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cage
ball
diameter
thickness
crown type
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JP2008025627A (en
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崇広 金本
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NTN 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

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)

Description

本発明は、樹脂冠型保持器及び玉軸受に関する。   The present invention relates to a resin crown type cage and a ball bearing.

一般に、図４に示すように、玉軸受は、内輪１と、外輪２と、この内輪１と外輪２との間に介装されるボール３と、このボール３を保持する保持器４とを備える。そして、保持器には樹脂冠型保持器を使用する場合がある。この樹脂冠型保持器４は、耐摩耗性や耐焼き付き性等に優れた樹脂からなり、図５に示すように、環状の保持器本体５の軸方向一端面６に周方向に沿って所定ピッチで配設される凹部７を形成するとともに、この凹部７の周方向に対向する開口端から突出する一対の爪部８、８を設けて、凹部７と一対の爪部８、８とでボール３が収納されるポケット９を形成したものである。なお、保持器本体５には、軸方向他端面１０に肉ぬすみ用の溝１１が設けられている。   In general, as shown in FIG. 4, the ball bearing includes an inner ring 1, an outer ring 2, a ball 3 interposed between the inner ring 1 and the outer ring 2, and a cage 4 that holds the ball 3. Prepare. In some cases, a resin crown type cage is used as the cage. This resin crown type retainer 4 is made of a resin excellent in wear resistance, seizure resistance, and the like, and as shown in FIG. While forming the recessed part 7 arrange | positioned by pitch and providing the pair of nail | claw parts 8 and 8 which protrude from the opening end which opposes the circumferential direction of this recessed part 7, the recessed part 7 and a pair of nail | claw parts 8 and 8 A pocket 9 in which the ball 3 is stored is formed. The cage body 5 is provided with a thinning groove 11 on the other axial end surface 10.

ところで、保持器４は、ボール３に対して滑り接触をするものである。例えば、外輪２が静止した状態で内輪１が回転する場合、ボール３は自転しつつ内輪の周囲を公転し、保持器４は、ボール３と滑り接触しながらボール３から駆動力を受け、ボール３の公転速度と同じ速度で内輪１の周囲を回転する。逆に、内輪１が静止した状態で外輪２が回転する場合も、ボール３は自転しつつ外輪２の内周を公転し、保持器４は、ボール３と滑り接触しながらボール３から駆動力を受け、ボール３の公転速度と同じ速度で外輪２の内周を回転する。   Incidentally, the cage 4 is in sliding contact with the ball 3. For example, when the inner ring 1 rotates while the outer ring 2 is stationary, the ball 3 revolves around the inner ring while rotating, and the cage 4 receives driving force from the ball 3 while slidingly contacting the ball 3, Rotate around the inner ring 1 at the same speed as the revolution speed of No. 3. Conversely, even when the outer ring 2 rotates while the inner ring 1 is stationary, the ball 3 revolves around the inner circumference of the outer ring 2 while rotating, and the cage 4 is driven by the ball 3 while being in sliding contact with the ball 3. And rotates the inner circumference of the outer ring 2 at the same speed as the revolution speed of the ball 3.

また、内輪１が静止した状態で外輪２を回転させたときは、外輪２が静止した状態で内輪１を回転させたときより保持器４はその回転速度が速くなる。このため、保持器４に比較的大きな遠心力が作用する。このように、大きな遠心力が作用すれば、前記した樹脂冠型保持器では、その遠心力によって、爪部８が外径側に広がり、ポケット９内のボール３を拘束し、円滑な回転を阻害するおそれがあった。   Further, when the outer ring 2 is rotated while the inner ring 1 is stationary, the rotational speed of the cage 4 is higher than when the inner ring 1 is rotated while the outer ring 2 is stationary. For this reason, a relatively large centrifugal force acts on the cage 4. Thus, when a large centrifugal force acts, in the above-described resin crown type cage, the claw portion 8 spreads to the outer diameter side due to the centrifugal force, restrains the ball 3 in the pocket 9, and smoothly rotates. There was a risk of obstruction.

そこで、この種の保持器においては、大きな遠心力が作用しても爪部が外径側に広がらないように剛性を向上させる必要があった。そして、従来には、高速回転した場合に、保持器の膨張変形を抑えようとしたものがある（特許文献１）。   Therefore, in this type of cage, it is necessary to improve the rigidity so that the claw portion does not spread to the outer diameter side even when a large centrifugal force is applied. Conventionally, there has been an attempt to suppress the expansion and deformation of the cage when rotating at high speed (Patent Document 1).

前記特許文献１に記載の保持器は、ボールピッチ円直径に対して外径側が内径側よりも長寸に形成されている。すなわち、保持器の内外径間寸法（肉厚）は、外輪の内径を拡径した分だけ長寸とし、保持器の剛性を高めている。これによって、ボールとの接触面における摩耗や高熱の発生等を防止するようにしている。
特開２００２−１８８６４９号 The cage described in Patent Document 1 is formed such that the outer diameter side is longer than the inner diameter side with respect to the ball pitch circle diameter. That is, the inner-outer diameter dimension (thickness) of the cage is made longer by increasing the inner diameter of the outer ring to increase the rigidity of the cage. This prevents wear on the contact surface with the ball and generation of high heat.
JP 2002-188649 A

しかしながら、前記特許文献１においては、保持器の内外径間寸法（肉厚）を大きくしたと記載されているが、ボールや内外輪等の大きさに対してどの程度の大きさについての限定はなく、高速回転した場合に、保持器の膨張変形を抑えることができる信頼性が低い。   However, in Patent Document 1, it is described that the inner-outer diameter (thickness) of the cage is increased. However, there is no limitation on the size of the ball, the inner and outer rings, and the like. However, when rotating at a high speed, the reliability that can suppress the expansion and deformation of the cage is low.

本発明は、上記課題に鑑みて、爪部の剛性をアップさせて、遠心力による爪部の変形を確実に抑えることができ、転動体であるボールを長期に亘って円滑に回転させることが可能な樹脂冠型保持器及び玉軸受を提供する。   In view of the above-described problems, the present invention can increase the rigidity of the claw part, reliably suppress the deformation of the claw part due to centrifugal force, and smoothly rotate the ball as a rolling element over a long period of time. A possible resin crown type cage and ball bearing are provided.

本発明の樹脂冠型保持器は、環状の保持器本体の軸方向一端面に周方向に沿って所定ピッチで配設される凹部を形成するとともに、この凹部の周方向に対向する開口端から一対の爪部を突設して、前記凹部と一対の爪部とでボールが収納されるポケットを形成し、保持器本体の軸方向他端面側に設けられるぬすみ部を形成した樹脂冠型保持器であって、ボールピッチ直径より外径側の径方向厚さを、前記ぬすみ部の位置をそのままに外径側の肉厚を増加させて、ボールピッチ直径より内径側の径方向厚さよりも厚くするとともに、この厚くした状態の保持器径方向厚さが、厚くしない状態の保持器径方向厚さよりも５％以上となって、前記ボールの直径の４５％以上となり、かつ、保持器本体の軸方向他端面側に設けられる前記ぬすみ部がボールピッチ直径上に配置されるものである。 The resin crown type cage of the present invention forms a recess disposed at a predetermined pitch along the circumferential direction on one end surface in the axial direction of the annular cage body, and from an opening end facing the circumferential direction of the recess. A resin crown type in which a pair of claw portions is provided so as to form a pocket in which a ball is accommodated by the concave portion and the pair of claw portions, and a thin portion provided on the other axial end side of the cage body is formed. The cage is configured such that the radial thickness on the outer diameter side from the ball pitch diameter is increased, and the thickness on the outer diameter side is increased while the position of the thinned portion is left as it is. The thickness of the cage in the thickened state is 5% or more than the thickness of the cage in the thickened state, 45% of the diameter of the ball, and the cage. The lightening portion provided on the other axial end surface side of the main body is It is intended to be placed on Rupitchi diameter.

本発明の樹脂冠型保持器によれば、回転中において、保持器は、ボールと滑り接触しながらボールから駆動力を受け、ボールの公転速度と同じ速度で回転することになる。このため、保持器は遠心力を生じることになる。しかしながら、径方向厚さがボールの直径の４５％以上であるので、遠心力による爪部の変形を防止できるだけの剛性向上を図ることができる。   According to the resin crown type cage of the present invention, during rotation, the cage receives a driving force from the ball while being in sliding contact with the ball, and rotates at the same speed as the revolution speed of the ball. For this reason, the cage generates centrifugal force. However, since the radial thickness is 45% or more of the diameter of the ball, the rigidity can be improved enough to prevent deformation of the claw due to centrifugal force.

ボールピッチ直径より外径側の径方向厚さを、ボールピッチ直径より内径側の径方向厚
さよりも厚くするとともに、この厚くした状態の保持器径方向厚さが、厚くしない状態の保持器径方向厚さよりも５％以上としているので、外径側の剛性が向上して、遠心力によって外径方向に広がろうとする変形を安定して防止できる。 The radial thickness on the outer diameter side from the ball pitch diameter is made thicker than the radial thickness on the inner diameter side from the ball pitch diameter, and the cage diameter in the thickened state is not increased. Since the thickness is set to 5% or more than the thickness in the direction, the rigidity on the outer diameter side is improved, and the deformation that attempts to spread in the outer diameter direction due to centrifugal force can be stably prevented.

本発明の玉軸受は、内輪と、外輪と、この内輪と外輪との間に介装されるボールと、このボールの保持する保持器とを備える玉軸受において、前記保持器に前記請求項１の樹脂冠型保持器を用いたものである。 The ball bearing according to the present invention is a ball bearing comprising an inner ring, an outer ring, a ball interposed between the inner ring and the outer ring, and a cage held by the ball. The resin crown type cage is used.

内輪が静止した状態で外輪を回転させたときは、外輪が静止した状態で内輪を回転させたときよりもその回転速度が速くなるので、保持器に比較的大きな遠心力が生じることになる。しかしながら、保持器は、その径方向厚さがボールの直径の４５％以上であるので、このような遠心力による爪部の変形を防止できるだけの剛性向上を図ることができる。   When the outer ring is rotated while the inner ring is stationary, the rotational speed is faster than when the inner ring is rotated while the outer ring is stationary, so that a relatively large centrifugal force is generated in the cage. However, since the radial thickness of the cage is 45% or more of the diameter of the ball, the rigidity can be improved to prevent deformation of the claw portion due to the centrifugal force.

本発明の樹脂冠型保持器では、遠心力による爪部の変形を防止できるだけの剛性向上を図ることができる。このため、爪部の変形によるボールの回転の拘束を防止できて、ボールは円滑に回転することができる。すなわち、爪部の内面及び凹部の内面の摩耗や焼き付きを防止できて、耐久性に優れた保持器となる。 In the resin crown type cage of the present invention, it is possible to improve rigidity enough to prevent deformation of the claw portion due to centrifugal force. For this reason, it is possible to prevent the rotation of the ball from being restricted due to the deformation of the claw portion, and the ball can rotate smoothly. That is, wear and seizure of the inner surface of the claw portion and the inner surface of the concave portion can be prevented, and the cage has excellent durability.

また、ボールピッチ直径より外径側の径方向厚さを、ボールピッチ直径より内径側の径方向厚さよりも厚くすることによって、外径側の剛性が向上して、遠心力によって外径方向に広がろうとする変形を安定して防止できる。このため、高品質の保持器を提供することができる。   Also, by making the radial thickness on the outer diameter side of the ball pitch diameter thicker than the radial thickness on the inner diameter side of the ball pitch diameter, the rigidity on the outer diameter side is improved and the centrifugal force is applied in the outer diameter direction. It is possible to stably prevent the deformation to spread. For this reason, a high quality cage can be provided.

本発明の玉軸受によれば、保持器は、内輪が静止した状態で外輪を回転させたときに生じる大きな遠心力に対して、爪部の変形を防止できるだけの剛性が向上している。このため、爪部の内面及び凹部の内面の摩耗や焼き付きを防止でき、耐久性に優れた保持器となる。すなわち、耐久性に優れた高品質の玉軸受を提供することができる。   According to the ball bearing of the present invention, the cage has improved rigidity to prevent deformation of the claw portion against a large centrifugal force generated when the outer ring is rotated while the inner ring is stationary. For this reason, wear and seizure of the inner surface of the claw portion and the inner surface of the concave portion can be prevented, and the cage has excellent durability. That is, a high-quality ball bearing having excellent durability can be provided.

以下、本発明の実施の形態を図１〜図３に基づいて説明する。   Hereinafter, embodiments of the present invention will be described with reference to FIGS.

図３に本発明の玉軸受を示し、この玉軸受は、内輪２１と、外輪２２と、この内輪２１と外輪２２との間に介装されるボール２３と、このボール２３を保持する保持器２４とを備える。 FIG. 3 shows a ball bearing of the present invention. The ball bearing includes an inner ring 21, an outer ring 22, a ball 23 interposed between the inner ring 21 and the outer ring 22, and a cage that holds the ball 23. 24.

この保持器２４は、耐摩耗性や耐焼き付き性等に優れた樹脂からなり、図２に示すように、軸方向一端面２６に周方向に沿って所定ピッチで配設される凹部７を形成した環状の保持器本体２５と、この保持器本体２５の凹部２７の周方向に対向する開口端から突出する爪部２８とを備える。そして、凹部２７と、この開口端から突出する一対の爪部２８、２８とで、前記ボール２３が保持されるポケット２９が構成される。   The cage 24 is made of a resin excellent in wear resistance, seizure resistance, and the like, and as shown in FIG. 2, the recesses 7 arranged at a predetermined pitch along the circumferential direction are formed on one end surface 26 in the axial direction. And the claw portion 28 that protrudes from the opening end facing the circumferential direction of the concave portion 27 of the retainer body 25. The recess 27 and the pair of claw portions 28 and 28 protruding from the open end constitute a pocket 29 for holding the ball 23.

保持器２４は、例えばポリエチレン、ポリアミド、ポリアセタール、ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリカーボネート、ポリフェニレンサルファイド、ポリエーテルサルフォン、ポリエーテルイミド、ポリアミドイミド、ポリエーテルエーテルケトン、熱可塑性ポリイミド、熱硬化性ポリイミド、エポキシ樹脂 、フェノール樹脂等の合成樹脂で形成することができる。さらには、ポリアミド、ポリフェニレンサルファイド、あるいはポリエーテルエーテルケトン等の熱可塑性樹脂をベースとして、強度向上と寸法安定性のために、ガラス繊維を添加したものも採用することができる。なお、外輪２２、内輪２１、ボール２３は、例えば軸受鋼、浸炭鋼等の金属で形成される。   The cage 24 is, for example, polyethylene, polyamide, polyacetal, polyethylene terephthalate, polybutylene terephthalate, polycarbonate, polyphenylene sulfide, polyether sulfone, polyether imide, polyamide imide, polyether ether ketone, thermoplastic polyimide, thermosetting polyimide, An epoxy resin and a synthetic resin such as a phenol resin can be used. Furthermore, based on a thermoplastic resin such as polyamide, polyphenylene sulfide, or polyether ether ketone, a glass fiber added to improve strength and dimensional stability can be used. In addition, the outer ring | wheel 22, the inner ring | wheel 21, and the ball | bowl 23 are formed, for example with metals, such as bearing steel and carburized steel.

保持器本体２５には、軸方向他端面３０に肉ぬすみ用の溝３１が設けられている。肉ぬすみ用の溝３１は、この保持器成形時の冷却速度を均一化してボイド（成形品の内部にできた空洞）やヒケ（成形品の外面に現れる収縮歪）やそり等の発生を防止する等のために設けている。   The cage body 25 is provided with a thinning groove 31 on the other axial end surface 30. The groove 31 for the meat thinning uniformizes the cooling rate at the time of molding the cage to prevent the occurrence of voids (cavities formed inside the molded product), sink marks (shrinkage distortion appearing on the outer surface of the molded product), warpage, and the like. It is provided for such purposes.

凹部２７の底面（内面）２７ａは、曲率半径がボール２３の半径とほぼ同一の凹曲面とされ、爪部２８、２８の内面２８ａ、２８ａは、凹部２７の内面２７ａの曲率半径と同一の凹曲面とされている。なお、爪部２８、２８の外面は、凸曲面とされている。   The bottom surface (inner surface) 27a of the recess 27 is a concave curved surface having a radius of curvature that is substantially the same as the radius of the ball 23, and the inner surfaces 28a, 28a of the claw portions 28, 28 are the same as the radius of curvature of the inner surface 27a of the recess 27. It is a curved surface. In addition, the outer surface of the nail | claw parts 28 and 28 is made into the convex curved surface.

また、図３に示すように、内輪２１にはその外径面３２にボール転動溝３３が設けられ、外輪２２にはその内径面３４にボール転動溝３５が設けられている。そして、こられのボール転動溝３３、３５にボール２３が嵌合している。このため、ボール転動溝３３、３５の曲率半径はボール２３の半径よりも大きくしている。   As shown in FIG. 3, the inner ring 21 is provided with a ball rolling groove 33 on its outer diameter surface 32, and the outer ring 22 is provided with a ball rolling groove 35 on its inner diameter surface 34. The balls 23 are fitted in these ball rolling grooves 33 and 35. For this reason, the radius of curvature of the ball rolling grooves 33 and 35 is larger than the radius of the ball 23.

ところで、保持器２４の径方向厚さＴ（図１参照）をボール２３の直径Ｄ（図３参照）の４５％以上としている。このため、この種の従来の保持器２４の径方向厚さＴ１よりも５％以上大きくなっている。この場合、外径側の肉厚を増加させて径方向厚さＴを大きくしている。すなわち、図３に示すように、ボールピッチ直径（ＰＣＤ）より外径側の径方向厚さｔ１を、ボールピッチ直径（ＰＣＤ）より内径側の径方向厚さｔ２よりも厚くしている。   Incidentally, the radial thickness T (see FIG. 1) of the cage 24 is set to 45% or more of the diameter D (see FIG. 3) of the ball 23. For this reason, it is 5% or more larger than the radial thickness T1 of the conventional cage 24 of this type. In this case, the radial thickness T is increased by increasing the thickness on the outer diameter side. That is, as shown in FIG. 3, the radial thickness t1 on the outer diameter side from the ball pitch diameter (PCD) is made thicker than the radial thickness t2 on the inner diameter side from the ball pitch diameter (PCD).

このように、外径側の肉厚を増加させて径方向厚さＴを大きくした場合、保持器２４の外径面３６が外輪２２の内径面３４に干渉するおそれがあるので、外輪２２の内径面３４の径を大きくする必要がある。この場合、外輪２２の外径面３７を変更しない。   In this way, when the radial thickness T is increased by increasing the thickness on the outer diameter side, the outer diameter surface 36 of the cage 24 may interfere with the inner diameter surface 34 of the outer ring 22. It is necessary to increase the diameter of the inner diameter surface 34. In this case, the outer diameter surface 37 of the outer ring 22 is not changed.

このため、外輪２２の径方向厚さＴ３が内輪２１の径方向厚さＴ２よりも小さくなるとともに、外輪２２のボール転動溝３５の深さｔ４が、内輪２１のボール転動溝３３の深さｔ３よりも小さくなっている。なお、図例では、内輪２１の外径面３２と保持器２４の内径面３８との間の隙間寸法ｍ１と外輪２２の内径面３４と保持器２４の外径面３６との間の隙間寸法ｍ２とを同一としても相違させてもよい。   Therefore, the radial thickness T3 of the outer ring 22 is smaller than the radial thickness T2 of the inner ring 21, and the depth t4 of the ball rolling groove 35 of the outer ring 22 is the depth of the ball rolling groove 33 of the inner ring 21. It is smaller than t3. In the illustrated example, the gap dimension m1 between the outer diameter surface 32 of the inner ring 21 and the inner diameter surface 38 of the cage 24 and the gap dimension between the inner diameter surface 34 of the outer ring 22 and the outer diameter surface 36 of the cage 24 are shown. m2 may be the same or different.

本発明の保持器では、回転中において、この保持器２４は、ボール２３と滑り接触しながらボール２３から駆動力を受け、ボール２３の公転速度と同じ速度で回転することになる。このため、保持器２４は遠心力を生じることになる。しかしながら、径方向厚さがボール２３の直径Ｄの４５％以上であるので、遠心力による爪部２８、２８の変形を防止できるだけの剛性向上を図ることができる。このため、爪部２８、２８の変形によるボール２３の回転の拘束を防止できて、ボール２３は円滑に回転することができる。すなわち、爪部２８の内面２８ａ及び凹部７の内面７ａの摩耗や焼き付きを防止できて、耐久性に優れた保持器となる。   In the cage of the present invention, during the rotation, the cage 24 receives a driving force from the ball 23 while slidingly contacting the ball 23, and rotates at the same speed as the revolution speed of the ball 23. For this reason, the cage 24 generates a centrifugal force. However, since the radial thickness is 45% or more of the diameter D of the ball 23, the rigidity can be improved so as to prevent the claw portions 28, 28 from being deformed by the centrifugal force. Therefore, it is possible to prevent the rotation of the ball 23 due to the deformation of the claw portions 28, 28, and the ball 23 can smoothly rotate. That is, wear and seizure of the inner surface 28a of the claw portion 28 and the inner surface 7a of the concave portion 7 can be prevented, and the cage has excellent durability.

保持器２４の径方向厚さＴをボール２３の直径Ｄの４５％未満では、ボール２３の回転に伴って回転する保持器２４に作用する遠心力に対して、このような樹脂製の保持器２４の爪部２８、２８の変形を防止できる剛性の向上を望めるものではない。このため、保持器２４の径方向厚さＴとしては大きければ大きいほど、外径方向への変形を防止できる剛性を向上させることになる。しかしながら、大きければ、保持器２４が大径となって、玉軸受の外径寸法が大となったり、外輪２２の径方向厚さが小さくなって、この外輪２２の剛性が低下したりする。したがって、保持器２４の径方向厚さＴとしては、ボール２３の直径Ｄの４５％以上５５％未満が好ましい。   When the radial thickness T of the cage 24 is less than 45% of the diameter D of the ball 23, such a resin cage is used against the centrifugal force acting on the cage 24 that rotates as the ball 23 rotates. The improvement of the rigidity which can prevent the deformation | transformation of the 24 nail | claw parts 28 and 28 cannot be expected. For this reason, the larger the radial thickness T of the cage 24, the higher the rigidity that can prevent deformation in the outer radial direction. However, if it is large, the cage 24 has a large diameter, and the outer diameter of the ball bearing becomes large, or the radial thickness of the outer ring 22 decreases, and the rigidity of the outer ring 22 decreases. Therefore, the radial thickness T of the cage 24 is preferably 45% or more and less than 55% of the diameter D of the ball 23.

本発明の玉軸受によれば、保持器２４は、内輪２１が静止した状態で外輪２２を回転させたときに生じる大きな遠心力に対して、爪部２８、２８の変形を防止できるだけの剛性が向上している。このため、爪部２８の内面２８ａ及び凹部２７の内面２７ａの摩耗や焼き付きを防止でき、耐久性に優れた保持器となる。すなわち、耐久性に優れた高品質の玉軸受を提供することができる。   According to the ball bearing of the present invention, the cage 24 has sufficient rigidity to prevent deformation of the claw portions 28 and 28 against a large centrifugal force generated when the outer ring 22 is rotated while the inner ring 21 is stationary. It has improved. For this reason, wear and seizure of the inner surface 28a of the claw portion 28 and the inner surface 27a of the concave portion 27 can be prevented, and the cage has excellent durability. That is, a high-quality ball bearing having excellent durability can be provided.

以上、本発明の実施形態につき説明したが、本発明は前記実施形態に限定されることなく種々の変形が可能であって、例えば、玉軸受のボール数の増減は任意であり、また、肉ぬすみ用の溝３１を有しないものであってもよい。   As described above, the embodiments of the present invention have been described. However, the present invention is not limited to the above-described embodiments, and various modifications are possible. For example, the increase or decrease in the number of balls of the ball bearing is arbitrary, and the meat You may not have the groove | channel 31 for a dullness.

本発明の実施形態の保持器の断面図である。It is sectional drawing of the holder | retainer of embodiment of this invention. 前記保持器の要部斜視図である。It is a principal part perspective view of the said holder | retainer. 本発明の実施形態の玉軸受の要部断面図である。It is principal part sectional drawing of the ball bearing of embodiment of this invention. 従来の保持器を使用した玉軸受の断面図である。It is sectional drawing of the ball bearing which uses the conventional cage | basket. 従来の保持器の要部斜視図である。It is a principal part perspective view of the conventional holder | retainer.

符号の説明Explanation of symbols

２１ 内輪
２２ 外輪
２３ ボール
２４ 保持器
２５ 保持器本体
２６ 軸方向一端面
２７ 凹部
２８ 爪部
２９ ポケット 21 Inner ring 22 Outer ring 23 Ball 24 Cage 25 Cage body 26 Axial end face 27 Recess 28 Claw part 29 Pocket

Claims (2)

環状の保持器本体の軸方向一端面に周方向に沿って所定ピッチで配設される凹部を形成するとともに、この凹部の周方向に対向する開口端から一対の爪部を突設して、前記凹部と一対の爪部とでボールが収納されるポケットを形成し、保持器本体の軸方向他端面側に設けられるぬすみ部を形成した樹脂冠型保持器であって、
ボールピッチ直径より外径側の径方向厚さを、前記ぬすみ部の位置をそのままに外径側の肉厚を増加させて、ボールピッチ直径より内径側の径方向厚さよりも厚くするとともに、この厚くした状態の保持器径方向厚さが、厚くしない状態の保持器径方向厚さよりも５％以上となって、前記ボールの直径の４５％以上となり、かつ、保持器本体の軸方向他端面側に設けられる前記ぬすみ部がボールピッチ直径上に配置されることを特徴とする樹脂冠型保持器。 Forming a recess disposed at a predetermined pitch along the circumferential direction on one axial end surface of the annular cage body, and projecting a pair of claws from an opening end facing the circumferential direction of the recess, A resin crown type cage in which a pocket for storing a ball is formed by the concave portion and the pair of claw portions, and a thin portion provided on the other axial end side of the cage body is formed ,
The radial thickness on the outer diameter side of the ball pitch diameter is increased by increasing the thickness on the outer diameter side while maintaining the position of the thinned portion, so that it is thicker than the radial thickness on the inner diameter side of the ball pitch diameter. The thickness in the cage radial direction in the thickened state is 5% or more than the thickness in the cage radial direction in the non-thickened state, 45% or more of the diameter of the ball, and the other axial end surface of the cage body A resin crown type retainer characterized in that the thinning portion provided on the side is disposed on a ball pitch diameter. 内輪と、外輪と、この内輪と外輪との間に介装されるボールと、このボールの保持する保持器とを備える玉軸受において、前記保持器に前記請求項１記載の樹脂冠型保持器を用いたことを特徴とする玉軸受。   A ball bearing comprising an inner ring, an outer ring, a ball interposed between the inner ring and the outer ring, and a cage held by the ball, the resin crown type cage according to claim 1 in the cage. A ball bearing characterized by using.
JP2006195930A 2006-07-18 2006-07-18 Resin crown type cage and ball bearing Expired - Fee Related JP4642712B2 (en)

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Publication number Priority date Publication date Assignee Title
EP2034202B1 (en) * 2007-08-28 2018-02-28 JTEKT Corporation Resin cage for ball bearing

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002188649A (en) * 2000-12-21 2002-07-05 Ntn Corp Ball bearing for pulley and pulley
JP2004092892A (en) * 2002-09-04 2004-03-25 Nsk Ltd Rolling bearing for high temperature and high speed

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002188649A (en) * 2000-12-21 2002-07-05 Ntn Corp Ball bearing for pulley and pulley
JP2004092892A (en) * 2002-09-04 2004-03-25 Nsk Ltd Rolling bearing for high temperature and high speed

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