JP2007309527A - Resin cage for rolling bearing - Google Patents

Resin cage for rolling bearing Download PDF

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JP2007309527A
JP2007309527A JP2007209055A JP2007209055A JP2007309527A JP 2007309527 A JP2007309527 A JP 2007309527A JP 2007209055 A JP2007209055 A JP 2007209055A JP 2007209055 A JP2007209055 A JP 2007209055A JP 2007309527 A JP2007309527 A JP 2007309527A
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resin
cage
base portion
rolling bearing
radius
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Jiyunya Ooitsu
純也 大逸
Hajime Tazumi
一 田積
Eirin Adachi
英琳 安達
Shigetaka Ashida
重孝 芦田
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JTEKT Corp
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JTEKT Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin cage for a rolling bearing usable for a long period of time in a high temperature region of 200°C or higher, moldable by an injection molding method using a usual split die even if having an undercut part, and excelling in productivity. <P>SOLUTION: Thermoplastic super engineering plastic or a polymer alloy having long-term heat resistance of 200°C or higher is used as a resin component, and the radius of curvature R<SB>1</SB>of the outer surfaces of claws 12a, 12b of a crown type cage is set to 110-150% of a radius R<SB>2</SB>of a ball. A projecting amount H<SB>1</SB>of the claw parts 12a, 12b from a base body part 10 is set to 25-75% of the width H<SB>2</SB>of the cage. The occurrence of damage such as whitening and cracking in mold release is thereby eliminated even if the undercut part exists. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は転がり軸受用の樹脂製保持器に関し、特に、長期耐熱性を有し、かつ、生産性に優れた転がり軸受用樹脂製保持器に関する。   The present invention relates to a resin cage for a rolling bearing, and particularly relates to a resin cage for a rolling bearing having long-term heat resistance and excellent productivity.

転がり軸受用の樹脂製の保持器のうち、１５０℃程度以上の長期耐熱性を要求されるものについては、その材質として一般にポリフェニレンサルファイド樹脂（以下、ＰＰＳ樹脂と称する）やポリアミド４６（ＰＡ４６）が用いられる。また、例えば自動車のオルタネータ用の軸受等、それ以上の温度域、２００℃程度以上の長期耐熱性が要求されるものについては、ポリイミド樹脂（以下、ＰＩ樹脂と称する）、ポリアミドイミド樹脂（以下、ＰＡＩ樹脂と称する）、あるいはポリエーテルエーテルケトン樹脂（以下、ＰＥＥＫ樹脂と称する）等のスーパーエンジニアリングプラスチックが用いられている。   Among resin cages for rolling bearings, those that require long-term heat resistance of about 150 ° C. or higher are generally made of polyphenylene sulfide resin (hereinafter referred to as PPS resin) or polyamide 46 (PA46). Used. In addition, for example, a bearing for an automobile alternator, etc., which requires a higher temperature range and a long-term heat resistance of about 200 ° C. or more, polyimide resin (hereinafter referred to as PI resin), polyamideimide resin (hereinafter referred to as Super engineering plastics such as PAI resin) or polyether ether ketone resin (hereinafter referred to as PEEK resin) are used.

ところで、２００℃以上の長期耐熱性を要求される樹脂製保持器に用いられている従来の樹脂材料は、高価格であるのみならず、以下に示すような問題点がある。   By the way, the conventional resin material used for the resin cage which requires long-term heat resistance of 200 ° C. or higher is not only expensive but also has the following problems.

ＰＩ樹脂については、熱硬化性樹脂であるために、生産性に劣るという問題がある。また、ＰＡＩ樹脂やＰＥＥＫ樹脂等のスーパーエンジニアリングプラスチックは、ボールを収容するためのポケットのそれぞれを、環状の基体部の一端面側に一対の爪を突出させてその内側に球面の一部をなすように形成した、いわゆる冠型保持器を容易に成形できないとう問題がある。すなわち、冠型保持器においては、基体部から突出する各爪の部分にアンダーカット部が存在するため、２つ割りの射出成形金型を用いてＰＥＥＫ樹脂やＰＡＩ樹脂を成形した場合、離型時に白化や割れが生じてしまう。従って、このようなＰＥＥＫ樹脂をはじめとするスーパーエンジニアリングプラスチック製の保持器は、従来、スライド式の金型を用いて、冠型ではない形状の保持器として用いている。   About PI resin, since it is a thermosetting resin, there exists a problem that it is inferior to productivity. In addition, super engineering plastics such as PAI resin and PEEK resin form a part of a spherical surface inside each of the pockets for housing the balls by projecting a pair of claws on one end surface side of the annular base portion. There is a problem that the so-called crown-shaped cage formed as described above cannot be easily molded. That is, in the crown type cage, there is an undercut portion in each nail portion protruding from the base portion. Therefore, when PEEK resin or PAI resin is molded using a two-part injection mold, the mold release Sometimes whitening and cracking occur. Therefore, such a super engineering plastic cage including the PEEK resin is conventionally used as a cage having a shape other than a crown type by using a sliding mold.

しかしながら、冠型保持器以外の形状をした樹脂製保持器では、ボールの抱き量が小さく、ボールの保持力が低いため、軸受の回転時に保持器音が発生したり、あるいは保持器が内外輪と接触するという問題がある。   However, a resin cage having a shape other than the crown cage has a small ball holding amount and a low ball holding force, so that a cage noise is generated when the bearing rotates or the cage is not connected to the inner and outer rings. There is a problem of contact with.

本発明はこのような実情に鑑みてなされたもので、２００℃以上の高温域での長期使用が可能で、しかも、アンダーカット部を含む冠型保持器としての生産性にも優れた転がり軸受用樹製保持器の提供を目的としている。   The present invention has been made in view of such circumstances, and is a rolling bearing that can be used for a long period of time in a high temperature range of 200 ° C. or higher, and that is excellent in productivity as a crown type cage including an undercut portion. The purpose is to provide a tree cage.

上記の目的を達成するため、本発明の転がり軸受用冠型保持器は、樹脂成分が熱可塑性スーパーエンジニアリングプラスチックの冠型保持器であって、この冠型保持器は基体部と、その基体部の軸方向一端側に突出する複数対の爪部とを備え、上記基体部は、上記爪の外面の最大径部分より軸方向他端側に形成され、上記爪の外面は上記基体部の軸方向一端側の平面から凹曲面を介して連なり、各ポケットを形成すべく基体部の軸方向一方側に突出させた各対の爪の外面の曲率半径が、当該保持器に保持されるボールの半径の１１０〜１５０％であり、かつ、上記爪の基体部からの突出量が、当該保持器の幅の２５〜７５％であることによって特徴づけられる（請求項１）。 In order to achieve the above object, a crown type cage for a rolling bearing according to the present invention is a crown type cage whose resin component is a thermoplastic super engineering plastic, and the crown type cage is composed of a base portion and a base portion thereof. A plurality of pairs of claw portions projecting toward one end side in the axial direction, the base portion is formed on the other end side in the axial direction from the maximum diameter portion of the outer surface of the claw, and the outer surface of the claw is an axis of the base portion The curvature radius of the outer surface of each pair of claws that are connected from the plane on one end side in the direction through the concave curved surface and project to one side in the axial direction of the base portion so as to form each pocket is the ball held by the cage. It is characterized by being 110 to 150% of the radius and the amount of protrusion of the nail from the base portion being 25 to 75% of the width of the cage (claim 1).

ここで、本発明においては、上記樹脂成分として、ＰＥＥＫ樹脂およびポリエーテルスルホン樹脂（以下、ＰＥＳ樹脂と称する）のうちのいずれかを好適に用いることができる（請求項２）。   Here, in the present invention, any one of PEEK resin and polyethersulfone resin (hereinafter referred to as PES resin) can be suitably used as the resin component (claim 2).

また、本発明においては、上記のスーパーエンジニアリングプラスチックのほかに、樹脂成分として、ポリアミドイミド樹脂と熱可塑性エンジニアリングプラスチックを主成分とするポリマーアロイを用いることもでき（請求項３）、そのポリマーアロイに用いるのに適した熱可塑性エンジニアリングプラスチックとしては、ポリフェニレンサルファイド樹脂を挙げることができる（請求項４）。   In the present invention, in addition to the super engineering plastic, a polymer alloy mainly composed of a polyamideimide resin and a thermoplastic engineering plastic can be used as a resin component (Claim 3). Examples of thermoplastic engineering plastics suitable for use include polyphenylene sulfide resins.

ここで、請求項１、２、３または４に係る発明の転がり軸受用樹脂製保持器においては、保持器としての各種性能を維持または向上させ、あるいは成形工程における成形性を損なわない範囲で、樹脂成分であるＰＡＩ樹脂と熱可塑性エンジニアリングプラスチックを主成分とするポリマーアロイに、または、熱可塑性樹脂スーパーエンジニアリングプラスチックに、ガラス繊維をはじめとする各種強化繊維や各種充填材等を含有させることができる。   Here, in the resin bearing cage for a rolling bearing of the invention according to claim 1, 2, 3 or 4, in the range that maintains or improves various performances as a cage, or does not impair the moldability in the molding process Various reinforcing fibers such as glass fibers and various fillers can be incorporated into a polymer alloy mainly composed of PAI resin and thermoplastic engineering plastic, which are resin components, or into a thermoplastic resin super engineering plastic. .

本発明は、冠型保持器の形状を見直すことによって、高温域における長期使用が可能であるものの、従来技術においてはアンダーカット部を有する冠型保持器への成形が不可能であるとされていたＰＥＥＫ樹脂をはじめとする熱可塑性スーパーエンジニアリングプラスチックを用いて、冠型保持器の射出成形を実現したものである。   Although the present invention can be used for a long period of time in a high temperature range by reviewing the shape of the crown-shaped cage, in the prior art, it is said that molding into a crown-shaped cage having an undercut portion is impossible. The injection molding of a crown type cage is realized using thermoplastic super engineering plastics such as PEEK resin.

すなわち、冠型保持器のポケットを構成する一対の爪の外径面の曲率半径を、当該保持器のポケットに保持されるボールの半径の１１０〜１５０％とし、また、爪の外面は基体部の軸方向一端側の平面から凹曲面を介して連ならせ、なおかつ各爪の基体部からの突出量を、当該保持器の幅（全幅）の２５〜７５％とすることにより、爪に作用する応力集中が緩和され、ポリエーテルエーテルケトンやポリエーテルスルホンをはじめとする耐熱性に富んだスーパーエンジニアリングプラスチックを樹脂成分として用いて、通常の２つ割りの金型を用いた射出成形により成形しても、離型時において白化や損傷が生じないことが確認された。   That is, the curvature radius of the outer diameter surface of the pair of claws constituting the pocket of the crown type cage is set to 110 to 150% of the radius of the ball held in the pocket of the cage, and the outer surface of the claw is the base portion. It acts on a nail | claw by making it connect from the plane of the axial direction one end side via a concave curved surface, and the protrusion amount from the base | substrate part of each nail | claw is 25 to 75% of the width | variety (full width) of the said holder | retainer. The stress concentration is relaxed, and it is molded by injection molding using a normal two-part mold using super engineering plastics, such as polyether ether ketone and polyether sulfone, which have high heat resistance, as resin components. However, it was confirmed that whitening and damage did not occur at the time of mold release.

一対の爪の外径面の曲率半径のボールの半径に対する率が１１０％未満であると、爪の肉厚が薄くなって所要の強度を得ることができず、１５０％を越えると離型時やボールのスナップフィット時における応力集中によって白化や割れが生じる。また、各爪の基体部からの突出量の保持器の幅に対する率が２５％未満であると、ボールの抱き量が小さくなって所要のボールの保持力が得られず、７５％を越えると離型時やボールのスナップフィット時における応力集中により白化や割れが生じる。   When the ratio of the radius of curvature of the outer diameter surfaces of the pair of claws to the radius of the ball is less than 110%, the thickness of the claws becomes thin and the required strength cannot be obtained. Whitening and cracking occur due to stress concentration during snap fit of the ball and ball. Further, if the ratio of the amount of protrusion from the base portion of each nail to the width of the cage is less than 25%, the amount of ball holding becomes small and the required holding force of the ball cannot be obtained. Whitening and cracking occur due to stress concentration during mold release and ball snap fit.

ここで、本発明において用いられるて用いられる熱可塑性スーパーエンジニアリングプラスチックの具体的な材質としては、ＰＥＥＫ樹脂のほか、ＰＥＳ樹脂を挙げることができる。   Here, as a specific material of the thermoplastic super engineering plastic used and used in the present invention, a PES resin can be cited in addition to the PEEK resin.

このようなＰＥＥＫ樹脂やＰＥＳ樹脂等の熱可塑性スーパーエンジニアリングプラスチックを用いて上記の構造的特徴を有する冠型保持器を用いることにより、当然のことながらその材質が本来的に有している高温域での長期耐熱性を発揮し、また、このような熱可塑性スーパーエンジニアリングプラスチックを用いた冠型以外の形状の保持器を用いる場合に比して、ボールの抱き量の増大によるボールの保持力の向上により、初期音響値の低減が確認されている。   By using a crown type cage having the above structural characteristics using a thermoplastic super engineering plastic such as PEEK resin or PES resin, it is natural that the material inherently has a high temperature range. In addition to the long-term heat resistance, the holding force of the ball due to the increased amount of ball holding compared to the case of using a cage with a shape other than the crown type using such a thermoplastic super engineering plastic. Improvement has been confirmed to reduce the initial acoustic value.

また、請求項１に係る発明の構成を備えた冠形樹脂製保持器の樹脂成分には、ＰＥＥＫ樹脂やＰＥＳ樹脂のような熱可塑性スーパーエンジニアリングプラスチック以外に、請求項３，４に係る発明のようなポリマーアロイを用いても２００℃以上の高温域での連続使用が可能であることが、本発明者らの研究によって確認されている。   In addition to the thermoplastic super engineering plastics such as PEEK resin and PES resin, the resin component of the crown-shaped resin cage having the configuration of the invention according to claim 1 includes the invention according to claims 3 and 4. It has been confirmed by the present inventors that continuous use in a high temperature range of 200 ° C. or higher is possible even when such a polymer alloy is used.

ＰＡＩ樹脂と熱可塑性エンジニアリングプラスチックを主成分とするポリマーアロイは、２００℃以上の高温域で連続使用が可能であり、かつ、通常の射出成形により成形可能で、ある程度以上の柔軟性および靱性を備えており、請求項１に係る発明の構成との併用により、本発明の目的を十分に達成することができる。   A polymer alloy mainly composed of PAI resin and thermoplastic engineering plastic can be used continuously in a high temperature range of 200 ° C or higher, and can be molded by ordinary injection molding, and has a certain degree of flexibility and toughness. Therefore, the object of the present invention can be sufficiently achieved by the combined use with the configuration of the invention according to claim 1.

すなわち、ＰＡＩ樹脂と、ＰＰＳ等の熱可塑性エンジニアリングプラスチックを主成分とするポリマーアロイは、２００℃以上の高温下での長期使用に耐え、しかも射出成形が可能であり、所要の柔軟性と靱性を有し、冠形保持器のようにアンダーカット部を有していても２つ割り金型からの離型時や転動体のスナップフィットによるボールの組み込み時に白化や損傷しにくく、冠形保持器のポケットを形成する一端面側に突出させた一対の爪の外面の曲率半径および爪の基体部からの突出量を、請求項１に記載の範囲とすることにより、生産時における前記した不具合を確実に解消することが可能となる。   That is, the polymer alloy mainly composed of PAI resin and thermoplastic engineering plastics such as PPS can withstand long-term use at a high temperature of 200 ° C. or more, and can be injection-molded, and has the required flexibility and toughness. Even if it has an undercut like a crown-shaped cage, it is less likely to be whitened or damaged when it is released from two split molds or when a ball is incorporated by snap fitting of rolling elements. By setting the radius of curvature of the outer surface of the pair of claws and the amount of protrusion from the base portion of the pair of nails that are projected to the one end surface side that forms the pocket of the above-described range, the above-described inconvenience during production can be achieved. It becomes possible to eliminate it reliably.

請求項３，４に係る発明の転がり軸受用樹脂製保持器に用いられるポリマーアロイは、ＰＡＩ樹脂と熱可塑性エンジニアリングプラスチックとの組成比については、特に限定されるものではないが、熱可塑性エンジニアリングプラスチックとしてＰＰＳ樹脂を用いる場合、一例として、ＰＡＩ樹脂とＰＰＳ樹脂を略１：１の割合で含有するポリマーアロイを、要求される耐熱性と成形性並びに柔軟性を兼ね備えた好適な材料として挙げることができる。そして、このような組成からなるポリマーアロイは低コストであるという利点がある。   The polymer alloy used in the resin cage for rolling bearings of the inventions according to claims 3 and 4 is not particularly limited with respect to the composition ratio of the PAI resin and the thermoplastic engineering plastic, but the thermoplastic engineering plastic In the case of using a PPS resin as an example, a polymer alloy containing a PAI resin and a PPS resin in a ratio of approximately 1: 1 may be cited as a suitable material having both required heat resistance, moldability, and flexibility. it can. And the polymer alloy which consists of such a composition has the advantage that it is low cost.

以上のように、本発明によれば、２００℃以上の長期耐熱性を有する保持器で、かつ、アンダーカット部を有する形状のものであっても通常の射出成形法を用いて、離型時において白化や損傷を生じることなく製造することが可能となり、また、スナップフィットによるボールの組み込み際しても損傷等を生じることがなく、高温式での長期耐熱性を有し、しかもボールの保持力の大きな低騒音の保持器が得られる。 As described above, according to the present invention, a cage having a long-term heat resistance of 200 ° C. or higher and a shape having an undercut portion can be used at the time of mold release using a normal injection molding method. Can be manufactured without causing whitening or damage, and there is no damage even when the ball is assembled by snap-fit. large noise of the retainer is obtained these forces.

樹脂成分をＰＥＥＫ樹脂とし、強化材としてガラス繊維を３０重量％、添加剤としてカーボンを１０重量％含有させた材料を用いて、図１に外観斜視図を、図２（Ａ）にはその要部正面図、同図（Ｂ）にはそのポケット１１の中心を通る図２（Ａ）の縦断面図を示す冠型保持器を成形した。   Using a material containing PEEK resin as a resin component, 30% by weight of glass fiber as a reinforcing material, and 10% by weight of carbon as an additive, FIG. 1 is an external perspective view, and FIG. The crown type cage shown in the longitudinal sectional view of FIG. 2 (A) passing through the center of the pocket 11 was formed in the front view of the part and FIG.

この冠型保持器は、ポケット１１内にボールを片持ち状に保持すべく、基体部１０から互いに対抗する２本の爪部１２ａ，１２ｂを突出させてポケット壁体を構成した構造を持ち、ポケット１１の内面および外面は球面とし、そのポケット１１の開放端であるポケット入口部の開口寸法（対抗する各爪部１２ａ，１２ｂの先端部間の距離）Ａが、ポケット最大径（ポケット１１内面の球面の直径）Ｂよりも１０％程度小さいアンダーカット状となっている。   This crown type retainer has a structure in which a pocket wall body is formed by projecting two claws 12a and 12b that oppose each other from the base 10 to hold the ball in a cantilevered manner in the pocket 11, The inner surface and the outer surface of the pocket 11 are spherical surfaces, and the opening dimension of the pocket inlet portion (the distance between the leading ends of the opposing claws 12a and 12b) A is the pocket maximum diameter (the inner surface of the pocket 11). The undercut shape is about 10% smaller than the spherical surface diameter B).

この実施例では、ポケット１１に対して直径３／８インチ（約９．５２５ｍｍ）のボールを組み込むものとし、ポケット１１を構成する一対の爪部１２ａ，１２ｂの寸法を種々に変化させて射出成形した。すなわち、図３にポケット１１の中心を通る要部断面図を示すように、ボール２の半径Ｒ2 に対する爪部１２ａ，１２ｂの外面の曲率半径Ｒ1 の率（Ｒ1 ／Ｒ2 ）、および、保持器の幅寸法Ｈ2 に対する爪部１２ａ，１２ｂの基体部１０からの突出量Ｈ1 の率（Ｈ1 ／Ｈ2 ）を種々に変化させ、通常の２つ割りの金型を用いて射出成形し、離型時における白化や割れ等の損傷を調査した。その結果の一部を〔表１〕に示す。 In this embodiment, a ball having a diameter of 3/8 inch (about 9.525 mm) is incorporated into the pocket 11, and the dimensions of the pair of claw portions 12a and 12b constituting the pocket 11 are variously changed by injection molding. did. That is, as shown in FIG. 3 which is a cross-sectional view of the main part passing through the center of the pocket 11, the ratio (R 1 / R 2 ) of the radius of curvature R 1 of the outer surface of the claw portions 12a, 12b to the radius R 2 of the ball 2; The ratio (H 1 / H 2 ) of the protrusion amount H 1 of the claw portions 12a and 12b from the base portion 10 with respect to the width dimension H 2 of the cage is variously changed, and a normal two-part mold is used. It was injection molded and examined for damage such as whitening and cracking during mold release. Some of the results are shown in [Table 1].

Figure 2007309527
Figure 2007309527

この〔表１〕における「結果」の欄は、射出成形工程における離型時に爪部１２ａ，１２ｂに白化もしくは割れのいずれも生じない場合を○、いずれかが生じた場合には×で表している。   The “Result” column in [Table 1] is indicated by ○ when no whitening or cracking occurs in the claw portions 12a and 12b at the time of mold release in the injection molding process, and by × when any occurs. Yes.

この〔表１〕に示されるように、ポケット１１の外面の曲率半径Ｒ1 のボール２の半径Ｒ2 に対する率、および、保持器の幅寸法Ｈ2 に対する爪部１２ａ，１２ｂの基体部１０からの突出量Ｈ1 の率のいずれもが本発明の範囲内にある実施例１〜４では離型時になんらの問題も生じなかったのに対し、いずれかがその範囲から逸脱している比較例１〜３では白化もしくは割れが生じ、実質的に２つ割りの金型を用いた射出成形が不可能であった。 As shown in Table 1, the rate for the curvature radius R 2 of the ball 2 of R 1 of the outer surface of the pocket 11, and the claw portion 12a to the width dimension of H 2 cage, the base portion 10 of 12b while either did not occur any problem at the time of examples 1-4 in the release within the scope of the present invention the rate of the projecting amount H 1, Comparative example either deviates from its scope In 1 to 3, whitening or cracking occurred, and injection molding using a split mold was virtually impossible.

また、実施例１，２の保持器の各ポケット１１に対し、半径ｒのボールをスナップフィットによって組み込んだが、その場合にも爪部１２ａ，１２ｂに白化ないしは割れ等が生じないことが確かめられた。そして、実施例１および２の保持器を用いて実際に転がり軸受を組み立てて回転性能等を調査したところ、当該保持器と同一の材質で、かつ、冠型保持器以外の形状の保持器を用いた場合に比して、ボールの抱き量の増大に起因するボールの保持力の向上により、初期音響値の低減が認められた。また、試験中に発生する全体的な音の低減も確認された。   Further, a ball having a radius r was incorporated into each pocket 11 of the cages of Examples 1 and 2 by snap fitting, and it was confirmed that no claw portions 12a and 12b were whitened or cracked in that case. . And when the rolling bearing was actually assembled using the cages of Examples 1 and 2 and the rotational performance and the like were investigated, a cage having the same material as that of the cage and having a shape other than the crown type cage was obtained. Compared with the case of using, the reduction of the initial acoustic value was recognized by the improvement of the holding force of the ball due to the increase of the holding amount of the ball. It was also confirmed that the overall sound generated during the test was reduced.

また、他の実施例として、主成分としてＰＡＩ樹脂とＰＰＳ樹脂を１：１の割合で含有するポリマーアロイに、強化ガラス繊維を４０重量％で含有させた材料（三菱ガス化学株式会社製ＭＳ−３，ＭＧＣ法に基づく長期耐熱性（２０，０００時間）２７０℃、ＡＳＴＭ Ｄ６３８に基づく引張強度１５９ＭＰａ、同Ｄ７９０に基づく曲げ強度および曲げ弾性率が、それぞれ、２３℃で２４０ＭＰａおよび１４ＧＰａ，１８０℃で１５０ＭＰａおよび８ＧＰａ，２５０℃で７０ＭＰａおよび３ＧＰａ）を用いて、上記の実施例１，２と同じ寸法のもとに、図１，図２に示したものと同じ構造の冠形保持器を射出成形によって成形したところ、上記した実施例１，２と同様に、離型時における白化や爪部１２ａ，１２ｂの損傷等は全く生じず、スナップフィットを利用してポケット１１内にボールを組み込んだ際にも、爪部１２ａ，１２ｂをはじめとする各部位の破損は生じなかった。   Further, as another example, a polymer alloy containing PAI resin and PPS resin as a main component in a ratio of 1: 1, and containing 40% by weight of reinforced glass fiber (MS-made by Mitsubishi Gas Chemical Co., Ltd.) 3, Long-term heat resistance based on MGC method (20,000 hours) 270 ° C., tensile strength 159 MPa based on ASTM D638, flexural strength and flexural modulus based on D790 are 240 MPa at 23 ° C. and 14 GPa, 180 ° C., respectively. 150 MPa and 8 GPa, 70 MPa and 3 GPa at 250 ° C.), and injection molding of a crown-shaped cage having the same structure as that shown in FIGS. As in the first and second embodiments, no whitening or damage to the claws 12a and 12b occurs at the time of mold release. Even when incorporating the ball in the pocket 11 by using the Ppufitto, breakage of each site to claw portion 12a, and 12b and the beginning did not occur.

本発明の各実施例で成形した冠型保持器の構成を示す外観斜視図である。It is an external appearance perspective view which shows the structure of the crown type holder | retainer shape | molded in each Example of this invention. 図２（Ａ）は図１の冠型保持器の要部正面図で、図２（Ｂ）はそのポケット１１の中心を通る縦断面図である。2A is a front view of the main part of the crown type retainer of FIG. 1, and FIG. 2B is a longitudinal sectional view passing through the center of the pocket 11. 本発明の実施および比較例における爪部１２ａ，１２ｂの寸法を説明するためのポケット１１の近傍の断面図である。It is sectional drawing of the vicinity of the pocket 11 for demonstrating the dimension of the nail | claw part 12a, 12b in the implementation and comparative example of this invention.

符号の説明Explanation of symbols

１０ 基体部
１１ ポケット
１２ａ，１２ｂ 爪部
２ ボール 10 Base part 11 Pocket 12a, 12b Claw part 2 Ball

Claims (4)

樹脂成分が熱可塑性スーパーエンジニアリングプラスチックの冠型保持器であって、
この冠型保持器は基体部と、その基体部の軸方向一端側に突出する複数対の爪部とを備え、
上記基体部は、上記爪の外面の最大径部分より軸方向他端側に形成され、
上記爪の外面は上記基体部の軸方向一端側の平面から凹曲面を介して連なり、
各ポケットを形成すべく基体部の軸方向一方側に突出させた各対の爪の外面の曲率半径が、当該保持器に保持されるボールの半径の１１０〜１５０％であり、かつ、上記爪の基体部からの突出量が、当該保持器の幅の２５〜７５％であることを特徴とする転がり軸受用樹脂製保持器。 The resin component is a crown type cage of thermoplastic super engineering plastic,
The crown type cage includes a base portion and a plurality of pairs of claw portions protruding toward one end side in the axial direction of the base portion,
The base portion is formed on the other end side in the axial direction from the maximum diameter portion of the outer surface of the claw,
The outer surface of the claw is continuous from the plane on one end side in the axial direction of the base portion via a concave curved surface,
The radius of curvature of the outer surface of each pair of claws projected to one side in the axial direction of the base portion to form each pocket is 110 to 150% of the radius of the ball held in the cage, and the claws The protrusion amount from the base | substrate part is 25 to 75% of the width | variety of the said holder | retainer, The resin-made cage for rolling bearings characterized by the above-mentioned. 上記樹脂成分が、ポリエーテルエーテルケトンおよびポリエーテルスルホンのうちのいずれかであることを特徴とする請求項１に記載の転がり軸受用樹脂製保持器。   The resin-made cage for a rolling bearing according to claim 1, wherein the resin component is any one of polyether ether ketone and polyether sulfone. 上記樹脂成分が、ポリアミドイミド樹脂と熱可塑性エンジニアリングプラスチックを主成分とするポリマーアロイであることを特徴とする請求項２に記載の転がり軸受用樹脂製保持器。   3. The resin-made cage for a rolling bearing according to claim 2, wherein the resin component is a polymer alloy mainly composed of a polyamideimide resin and a thermoplastic engineering plastic. 上記熱可塑性エンジニアリングプラスチックが、ポリフェニレンサルファイド樹脂であることを特徴とする請求項３に記載の転がり軸受用樹脂製保持器。   4. The resin-made cage for a rolling bearing according to claim 3, wherein the thermoplastic engineering plastic is polyphenylene sulfide resin.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018173120A (en) * 2017-03-31 2018-11-08 株式会社ジェイテクト Rolling bearing

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5958228A (en) * 1982-09-28 1984-04-03 Koyo Seiko Co Ltd Crown retainer made of synthetic resin for ball bearing
JPS5981813U (en) * 1982-11-24 1984-06-02 日本精工株式会社 plastic retainer
JPS62151431U (en) * 1986-03-17 1987-09-25
JPH05321939A (en) * 1992-05-19 1993-12-07 Koyo Seiko Co Ltd Rolling bearing retainer
JPH0988967A (en) * 1995-09-29 1997-03-31 Ntn Corp Pulley and ball bearing therefor
JPH09144761A (en) * 1995-09-18 1997-06-03 Ntn Corp Ball bearing, and pulley and fan provided with the ball bearing

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5958228A (en) * 1982-09-28 1984-04-03 Koyo Seiko Co Ltd Crown retainer made of synthetic resin for ball bearing
JPS5981813U (en) * 1982-11-24 1984-06-02 日本精工株式会社 plastic retainer
JPS62151431U (en) * 1986-03-17 1987-09-25
JPH05321939A (en) * 1992-05-19 1993-12-07 Koyo Seiko Co Ltd Rolling bearing retainer
JPH09144761A (en) * 1995-09-18 1997-06-03 Ntn Corp Ball bearing, and pulley and fan provided with the ball bearing
JPH0988967A (en) * 1995-09-29 1997-03-31 Ntn Corp Pulley and ball bearing therefor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018173120A (en) * 2017-03-31 2018-11-08 株式会社ジェイテクト Rolling bearing

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