JP2007333187A - Resin made crown cage for ball bearing, and ball bearing with the cage - Google Patents

Resin made crown cage for ball bearing, and ball bearing with the cage Download PDF

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JP2007333187A
JP2007333187A JP2006169099A JP2006169099A JP2007333187A JP 2007333187 A JP2007333187 A JP 2007333187A JP 2006169099 A JP2006169099 A JP 2006169099A JP 2006169099 A JP2006169099 A JP 2006169099A JP 2007333187 A JP2007333187 A JP 2007333187A
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cage
claws
ball
crown
resin
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Kengo Hiramatsu
研吾 平松
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin made crown cage for a ball bearing, and a ball bearing with the cage integrated wherein whitening or breakage of a claw part is not caused in a molding process and bearing-assembly, occurrence of deformations during use of the bearing is suppressed, and the durability is ensured. <P>SOLUTION: The resin made crown cage comprises: ring parts 2; and claws 3 formed at a plurality of positions extendedly in the circumferential direction from the respective ring parts 2. Claws 3 are faced in pairs to each other, and a recess 4 is formed in the ring part 2 between the pair of claws 3 opposed to each other. A pocket 5 for holding a ball 6 is formed of the each pair of claws 3 and the recess 4. The distance Hw between the tip ends of the opposed claws 3 is made narrower than the diameter Dw of the ball 6. The whole of the cage 1 is formed of a resin. The claws 3, and the root parts 3a of the claws 3 are formed of a material of an elastic-modulus smaller than that of the main-body part 1A of the other part of the cage 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

この発明は、玉軸受、例えば、一般産業機械用軸受や自動車の車輪用軸受等として用いられるアンギュラ玉軸受における冠形樹脂保持器とこの保持器を組み込んだ玉軸受に関する。   The present invention relates to a ball bearing, for example, a crown-shaped resin cage in an angular ball bearing used as a bearing for a general industrial machine, a wheel for an automobile, or the like, and a ball bearing incorporating the cage.

玉軸受に組み込まれる冠形樹脂保持器としては、ガラス繊維等で強化されたナイロン樹脂（ポリアミド樹脂）で成形されたものが広く知られている。このような冠形樹脂保持器は、玉を等間隔に保持するポケットが一対の爪で形成され、爪の先端間の開口部が軸方向に開いた形状になっている。対向する爪の先端間の間隔は、ボールを確実に保持して脱落しないように、前記ボールの直径よりも狭くされている。特許文献１には、このような構造の玉軸受用冠形樹脂保持器が開示されている（同文献の図７，図８参照）。   As a crown-shaped resin cage incorporated in a ball bearing, one formed of a nylon resin (polyamide resin) reinforced with glass fiber or the like is widely known. In such a crown-shaped resin retainer, a pocket for holding balls at equal intervals is formed by a pair of claws, and an opening between the tips of the claws is open in the axial direction. The distance between the tips of the opposing claws is narrower than the diameter of the ball so as to securely hold the ball and not fall off. Patent Document 1 discloses a crown-shaped resin cage for a ball bearing having such a structure (see FIGS. 7 and 8 of the same document).

図６は、上記玉軸受用冠形樹脂保持器のポケット部を示す断面図である。図６に示す保持器５０においては、リング部５１と、このリング部５１から各々軸方向に延びる周方向複数箇所の爪５２を有し、対向する各一対の爪５２の間でリング部５１に凹部５３が形成されている。各一対の爪５２と凹部５３とで、ボール５５を保持するポケット５４がそれぞれ形成されており、ポケット５４の開口部が軸方向に開いた構造となっている。ボール５５を確実に保持してボール５５が脱落しないように、この開口部のポケット入口寸法Ｈｗは、ボール径Ｄｗより小さく設定されており、所定の締代を有している。この締代は、ボール５５が脱落せず、組立時のボールの挿入力が過大とならないように設定されている。   FIG. 6 is a cross-sectional view showing a pocket portion of the crown-shaped resin cage for ball bearings. The cage 50 shown in FIG. 6 has a ring portion 51 and a plurality of circumferentially extending claws 52 extending in the axial direction from the ring portion 51, and the ring portion 51 is provided between a pair of opposed claws 52. A recess 53 is formed. Each of the pair of claws 52 and the recess 53 forms a pocket 54 for holding the ball 55, and the opening of the pocket 54 is open in the axial direction. The pocket entrance dimension Hw of the opening is set smaller than the ball diameter Dw and has a predetermined allowance so that the ball 55 is securely held and the ball 55 does not fall off. The tightening allowance is set so that the ball 55 does not fall off and the insertion force of the ball during assembly is not excessive.

また、特許文献２は、ボールの締代を成形する際の脱型時に、いわゆる「無理抜き」をしないようにするため、爪部を形成する柱部内径側部分と外径側部分とに別々の金型を用い、互いに逆方向に脱型することを提案している。
特開２００２−１９５２６９号公報 特開１０−１０３３５９号公報 Further, in Patent Document 2, in order to prevent so-called “unreasonable punching” at the time of demolding when forming the tightening allowance of the ball, the column portion inner diameter side portion and the outer diameter side portion forming the claw portion are separately provided. It is proposed to remove the molds in the opposite directions.
JP 2002-195269 A JP 10-103359 A

図６に示すような冠形樹脂保持器５０を成形によって作製する際、金型の離型時にポケット５４の部分では、図６の白抜矢示方向に金型が無理抜きされる。このとき、ポケット５４の開口部は、瞬間的にポケット入口寸法Ｈｗからポケット径ＨＰまで広がり、爪５２が変形して応力が発生する。特に、爪５２の根元部５２ａに応力が集中するため、この部分で白化現象がおこり（白っぽく変色する現象）、最悪の場合、爪根元部を起点とした破損に至ることもある。また、ポケット入口寸法Ｈｗと、ボール径Ｄｗとの関係が、上記のように所定の締代を有するように設定されているので、軸受組立時にボール５５をポケット５４に挿入する際にも、爪根元部５２ａへの応力集中による白化現象および破損がおこり得る。このような白化現象や破損がおこる原因は、弾性率が大きく弾性変形し難い高強度の樹脂材料を使用しているからである。
しかし、弾性率の小さい（強度の低い）材料を用いると、軸受使用時の変形や耐久性に問題を生じることになるため、好ましくない。 When the crown-shaped resin cage 50 as shown in FIG. 6 is produced by molding, the mold is forcibly removed in the direction of the white arrow in FIG. At this time, the opening of the pocket 54 instantaneously expands from the pocket entrance dimension Hw to the pocket diameter HP, and the claw 52 is deformed to generate stress. In particular, since stress concentrates on the root portion 52a of the nail 52, a whitening phenomenon occurs in this portion (a phenomenon that turns whitish), and in the worst case, breakage may occur starting from the nail root portion. Further, since the relationship between the pocket entrance dimension Hw and the ball diameter Dw is set so as to have a predetermined allowance as described above, when the ball 55 is inserted into the pocket 54 when the bearing is assembled, Whitening and damage due to stress concentration on the root 52a can occur. The reason why such whitening phenomenon or breakage occurs is because a high-strength resin material having a large elastic modulus and not easily elastically deformed is used.
However, it is not preferable to use a material having a low elastic modulus (low strength) because it causes problems in deformation and durability when the bearing is used.

また、特許文献２で提案されたアンギュラ玉軸受用樹脂保持器の場合、上記のような無理抜きをしないから、白化現象や破損がおこる懸念がないが、２つの金型を準備し、これを互いに逆方向に脱型するような煩わしい作業と装置構成を必要とする。   In addition, in the case of the resin cage for angular ball bearings proposed in Patent Document 2, there is no concern that whitening phenomenon or damage will occur because the above-mentioned force is not removed. A troublesome work and apparatus configuration for demolding in opposite directions are required.

この発明の目的は、成形時や軸受組立時等における爪部分の白化現象や破損を生じず、かつ軸受使用時の変形を抑え耐久性を確保することができる玉軸受用冠形樹脂保持器とこれを組み込んだ玉軸受を提供することである。   An object of the present invention is to provide a crown-shaped resin cage for a ball bearing that does not cause a whitening phenomenon or breakage of a claw part at the time of molding or assembly of a bearing, and that can prevent deformation during use of the bearing and ensure durability. It is to provide a ball bearing incorporating this.

この発明の玉軸受用冠形樹脂保持器は、リング部と、このリング部から各々軸方向に延びる周方向複数箇所の爪を有し、各爪は一対ずつ互いに対向し、これら対向する各一対の爪の間で前記リング部に凹部が形成され、前記各一対の爪と前記凹部とで、ボールを保持するポケットがそれぞれ形成され、前記対向する爪の先端間の間隔が前記ボールの直径よりも狭く、保持器全体が樹脂製とされた玉軸受用冠形樹脂保持器において、前記各爪およびこの爪の根元部を、この保持器における他の部位である本体部分よりも弾性率の小さな材料で構成したことを特徴とするものである。   The crown-shaped resin cage for a ball bearing according to the present invention has a ring portion and a plurality of circumferentially extending claws extending in the axial direction from the ring portion, and the claws are opposed to each other one by one. A concave portion is formed in the ring portion between the claws, and a pocket for holding the ball is formed by each of the pair of claws and the concave portion, and the distance between the tips of the opposing claws is determined by the diameter of the ball. In a crown-shaped resin cage for ball bearings in which the entire cage is made of resin, each claw and the base portion of the claw have a smaller elastic modulus than the main body portion which is another part of the cage. It is characterized by comprising a material.

この構成によると、各爪およびこの爪の根元部を、この保持器における他の部位である本体部分よりも弾性率の小さな材料で構成しているから、金型を用いてこの樹脂保持器を成形する際に、ポケット部分で金型を無理抜き状態で離型して爪部分に押し広げる力が作用しても、爪部分が弾性変形して応力の発生が抑えられ、爪の根元部に応力が集中することがない。また、軸受の組立時に、対向する爪間からポケット内にボールを圧入する際に、爪部分に押し広げる力が作用するが、この場合も、爪部分が弾性変形して応力の発生が抑えられ、爪の根元部に応力が集中することがない。これにより、爪の根元部の白化現象や根元部を起点とする破損の発生が抑えられる。また、本体部分は弾性率の大きな材料で構成されるから、軸受に組み込んで軸受の使用下におかれた場合における変形が抑えられ耐久性も確保される。   According to this structure, since each nail and the base part of this nail are made of a material having a smaller elastic modulus than the main body part, which is another part of this cage, the resin cage is used by using a mold. When molding, even if a force that spreads the mold in the pocket part and forcibly pulls it out to the nail part acts, the nail part is elastically deformed and the generation of stress is suppressed, and the base part of the nail is suppressed. There is no concentration of stress. Also, when a ball is pressed into the pocket from between the opposing claws during the assembly of the bearing, a force that pushes the claw part acts, but in this case, the claw part is elastically deformed to suppress the generation of stress. The stress does not concentrate at the base of the nail. Thereby, the whitening phenomenon of the base part of a nail | claw and the generation | occurrence | production of the damage starting from a base part are suppressed. Further, since the main body portion is made of a material having a large elastic modulus, deformation when the main body portion is incorporated in the bearing and used under the use of the bearing is suppressed, and durability is ensured.

この発明において、前記本体部分を繊維強化ポリアミド樹脂、爪および爪根元部を非強化のポリアミド樹脂としてもよい。繊維強化ポリアミド樹脂（ナイロン樹脂）は、この種の玉軸受用冠形樹脂保持器の構成材料として多用されており、本体部分が高強度の特性を備えることになるから、軸受使用時の変形を抑えかつ耐久性の確保に有効である。また、爪および爪根元部を非強化のポリアミド樹脂とすることにより、爪根元部の上記白化現象や破損の発生が抑えられることに加え、本体部分と同種の樹脂がベースとなることから、本体部分との一体性が確保される。   In the present invention, the main body portion may be a fiber reinforced polyamide resin, and the nail and the base of the nail may be an unreinforced polyamide resin. Fiber reinforced polyamide resin (nylon resin) is widely used as a constituent material of this type of crown bearing cage for ball bearings, and the main body part has high strength characteristics. It is effective in suppressing and ensuring durability. In addition, by using non-reinforced polyamide resin for the nails and base of the nail, the above-mentioned whitening phenomenon and breakage of the base of the nail are suppressed and the same type of resin as the main body is used as the base. Unity with the part is ensured.

この発明において、前記本体部分と、爪および爪根元部とが、二色成形により異なる樹脂材料で形成されたものとしても良い。本体部分および爪部分を個々に成形後、両者を接着または超音波溶着によって接合一体とすることも可能であるが、この場合は、接着や溶着の工数が必要とされると共に、接合誤差が生じ易い。二色成形は１回の成形工程で精度良く作製することができ、成形後の後加工も不要とされ、低コスト化が図れ、この意味で優れている。ここに、二色成形とは、異なる色や異なる材料の樹脂を同時に成形する技術で、１つの金型に対し２つの射出機構とゲートを備えた専用の成形機により成形する方法である。
なお、二色成形の場合は、各材料の境界面（ウエルドライン）における密着強度を考慮すると、全くの異質材料の組合せより、ベースポリマーを統一した組合せ（例えば、繊維強化ポリアミド樹脂と非強化のポリアミド樹脂の組合せのように）が望ましい。 In this invention, the said main-body part, a nail | claw, and a nail | claw root part are good also as what was formed with the different resin material by two-color molding. It is also possible to form the main body part and the claw part individually and then bond them together by bonding or ultrasonic welding. However, in this case, man-hours for bonding and welding are required, and bonding errors occur. easy. Two-color molding is excellent in this sense because it can be produced with high accuracy in a single molding process, and post-processing after molding is not required, and the cost can be reduced. Here, the two-color molding is a technique of simultaneously molding resins of different colors and different materials, and is a method of molding with a dedicated molding machine having two injection mechanisms and a gate for one mold.
In the case of two-color molding, considering the adhesion strength at the boundary surface (weld line) of each material, the combination of the base polymer is unified (for example, fiber reinforced polyamide resin and non-reinforcing material) rather than the combination of completely different materials. (Such as a combination of polyamide resins) is desirable.

この発明の玉軸受は、上記いずれかの玉軸受用冠形樹脂保持器を組み込んだことを特徴とするものである。この構成によると、上述のように、保持器の爪部の白化現象や破損の懸念がなく、また軸受使用時における保持器の変形が抑えられ、耐久性も確保されるから、玉軸受自体の耐久性も確保され、長寿命化が図られる。   A ball bearing according to the present invention is characterized by incorporating any of the above-mentioned crown-shaped resin cages for ball bearings. According to this configuration, as described above, there is no concern about the whitening phenomenon or damage of the claw portion of the cage, the deformation of the cage during use of the bearing is suppressed, and durability is ensured. Durability is also ensured and the service life is extended.

この発明の玉軸受用冠形樹脂保持器は、リング部と、このリング部から各々軸方向に延びる周方向複数箇所の爪を有し、各爪は一対ずつ互いに対向し、これら対向する各一対の爪の間で前記リング部に凹部が形成され、前記各一対の爪と前記凹部とで、ボールを保持するポケットがそれぞれ形成され、前記対向する爪の先端間の間隔が前記ボールの直径よりも狭く、保持器全体が樹脂製とされた玉軸受用冠形樹脂保持器において、前記各爪およびこの爪の根元部を、この保持器における他の部位である本体部分よりも弾性率の小さな材料で構成したため、成形時や軸受組立時等における爪部分の弾性変形により、爪根元部への応力の集中を抑え、これにより爪部分の白化現象を防ぐと共に爪根元部を起点とした破損の発生を抑制することができる。また、軸受に組み込み軸受使用時の変形を抑え耐久性を確保することができる。   The crown-shaped resin cage for a ball bearing according to the present invention has a ring portion and a plurality of circumferentially extending claws extending in the axial direction from the ring portion, and the claws are opposed to each other one by one. A concave portion is formed in the ring portion between the claws, and a pocket for holding the ball is formed by each of the pair of claws and the concave portion, and the distance between the tips of the opposing claws is determined by the diameter of the ball. In a crown-shaped resin cage for ball bearings in which the entire cage is made of resin, each claw and the base portion of the claw have a smaller elastic modulus than the main body portion which is another part of the cage. Because it is made of material, it suppresses the concentration of stress on the base of the nail due to elastic deformation of the nail during molding or assembly of the bearing, thereby preventing whitening of the nail and preventing damage from the base of the nail. By suppressing the occurrence That. Further, the durability can be ensured by suppressing the deformation when using the built-in bearing in the bearing.

この発明の玉軸受は、上記いずれかの玉軸受用冠形樹脂保持器を組み込んだものとしたため、保持器の爪部の白化現象や破損の懸念がなく、また軸受使用時における保持器の変形が抑えられ、かつ耐久性も確保されるから、玉軸受自体の耐久性も確保され、長寿命化が図られる。   Since the ball bearing according to the present invention incorporates one of the above-mentioned crown-shaped resin cages for ball bearings, there is no fear of whitening or damage of the claw portion of the cage, and deformation of the cage during use of the bearing Therefore, the durability of the ball bearing itself is ensured and the life is extended.

この発明の玉軸受用冠形樹脂保持器の一実施形態を図１ないし図３と共に説明する。この玉軸受用冠形樹脂保持器１は、アンギュラ玉軸受用の保持器であり、リング部２と、このリング部２から各々軸方向に延びる周方向複数箇所の爪３を有する。各爪３は一対ずつ互いに対向し、これら対向する各一対の爪３の間で前記リング部２に凹部４が形成され、前記各一対の爪３と前記凹部４とで、ボール６を保持するポケット５がそれぞれ形成されている。ポケット５は、円周方向に等配されている。前記対向する爪３の先端間の間隔（ポケット入口寸法）Ｈｗは、前記ボール６の直径（ボール径）Ｄｗよりも狭くされている。上記爪３は、リング部２から各々軸方向に延びる周方向複数箇所の柱部３Ａの先端に二股状に湾曲形成されている。   An embodiment of a crown-shaped resin cage for ball bearings according to the present invention will be described with reference to FIGS. This ball bearing crown-shaped resin cage 1 is a cage for an angular ball bearing, and has a ring portion 2 and a plurality of claw portions 3 extending in the axial direction from the ring portion 2. Each pair of claws 3 faces each other, and a recess 4 is formed in the ring portion 2 between each pair of claws 3 facing each other, and the pair of claws 3 and the recess 4 hold the ball 6. Each pocket 5 is formed. The pockets 5 are equally arranged in the circumferential direction. The distance (pocket entrance dimension) Hw between the tips of the opposing claws 3 is made narrower than the diameter (ball diameter) Dw of the ball 6. The claw 3 is bent and formed in a bifurcated shape at the distal ends of a plurality of column portions 3A extending in the axial direction from the ring portion 2.

保持器１の全体は樹脂の成形体とされ、各爪３およびこの爪３の根元部３ａは、この保持器１における他の部位、すなわち、リング部２および柱部３Ａからなる本体部分１Ａよりも、弾性率の小さな樹脂材料で構成されている。具体的には、本体部分１Ａは、繊維強化ポリアミド樹脂で、爪３および爪根元部３ａは、非強化のポリアミド樹脂で形成されている。繊維強化ポリアミド樹脂としては、ナイロン６６にガラス繊維を２５重量％混練させたもの（以下、ＰＡ６６＋ＧＦ２５と表す）を、非強化のポリアミド樹脂としては、ナイロン６６のみ（以下、ＰＡ６６ナチュラルと表す）をそれぞれ用いることができる。表１にこのようなナイロン樹脂の代表物性値を示す。   The entire cage 1 is a molded body of resin, and each claw 3 and the base portion 3a of the claw 3 are formed from other parts of the cage 1, that is, the main body portion 1A including the ring portion 2 and the column portion 3A. Also, it is made of a resin material having a small elastic modulus. Specifically, the main body portion 1A is made of a fiber reinforced polyamide resin, and the claws 3 and the claw root portions 3a are made of a non-reinforced polyamide resin. As the fiber reinforced polyamide resin, 25% by weight of glass fiber is kneaded with nylon 66 (hereinafter referred to as PA66 + GF25), and as the non-reinforced polyamide resin, only nylon 66 (hereinafter referred to as PA66 natural) is used. Can be used. Table 1 shows typical physical property values of such a nylon resin.

Figure 2007333187
Figure 2007333187

表１から、ＰＡ６６＋ＧＦ２５％の引張り弾性率および曲げ弾性率が、ＰＡ６６ナチュラルよりも大であることが理解される。なお、本体部分１Ａの樹脂材料と、爪３および爪根元部３ａの樹脂材料との組合せとしては、上記のようなナイロン樹脂をベースとするもの以外に、ポリフェニレンサルファイド樹脂を３０重量％のガラス繊維で強化したものと、ポリフェニレンサルファイド樹脂のみとの組合せも可能である。いずれも、爪３および爪根元部３ａが本体部分１Ａよりも弾性率の小さな樹脂材料で構成される。   From Table 1, it is understood that the tensile modulus and flexural modulus of PA66 + GF25% are larger than PA66 natural. In addition, as a combination of the resin material of the main body portion 1A and the resin material of the nail 3 and the base of the nail 3a, in addition to the above-mentioned nylon resin, 30% by weight of a glass fiber containing polyphenylene sulfide resin is used. It is also possible to combine the resin reinforced with the above and a polyphenylene sulfide resin alone. In either case, the nail 3 and the nail root portion 3a are made of a resin material having a smaller elastic modulus than the main body portion 1A.

この玉軸受用冠形樹脂保持器１は、二色成形法によって一体成形される。すなわち、１つの金型に対し、本体部分１Ａに繊維強化された樹脂材料を注入する射出機構と、爪３および爪根元部３ａに非強化の樹脂材料を注入する射出機構と、ゲートとを備えた専用の成形機（いずれも図示せず）を準備し、１回の成形工程で玉軸受用冠形樹脂保持器１が一体成形される。そして、離型時にはポケット５の部分で図３の白抜矢示方向に金型が無理抜きされる。この時、ポケット５の開口部は、瞬間的にポケット入口寸法Ｈｗからポケット径ＨＰまで広がり、爪３および爪根元部３ａが変形する。しかし、爪３および爪根元部３ａは、本体部分１Ａよりも弾性率の小さな樹脂材料で構成されるから、十分な弾性変形量を保有し、この弾性変形によって応力が生じない。したがって、爪根元部３ａへの応力の集中もなく、根元部３ａの白化現象の発生や根元部３ａを起点とした破損に至ることもない。爪３は柱部３Ａの先端に二股状に形成されているから、この形状的特性により、上記弾性変形が助長され、爪根元部３ａへの応力の集中防止がより効果的になされる。   The ball bearing crown-shaped resin cage 1 is integrally molded by a two-color molding method. That is, an injection mechanism for injecting a fiber-reinforced resin material into the main body portion 1A, an injection mechanism for injecting an unreinforced resin material into the nail 3 and the nail root portion 3a, and a gate are provided for one mold. A dedicated molding machine (not shown) is prepared, and the ball bearing crown-shaped resin cage 1 is integrally molded in a single molding process. And at the time of mold release, a metal mold | die is forcibly extracted by the part of the pocket 5 in the direction of the white arrow of FIG. At this time, the opening of the pocket 5 instantaneously expands from the pocket entrance dimension Hw to the pocket diameter HP, and the nail 3 and the nail root 3a are deformed. However, since the nail 3 and the nail root portion 3a are made of a resin material having a smaller elastic modulus than the main body portion 1A, the nail 3 and the nail root portion 3a have a sufficient amount of elastic deformation, and no stress is generated by this elastic deformation. Therefore, there is no concentration of stress on the nail root portion 3a, and neither the occurrence of the whitening phenomenon of the root portion 3a nor the damage starting from the root portion 3a is caused. Since the claw 3 is formed in a bifurcated shape at the tip of the column portion 3A, this shape characteristic promotes the elastic deformation and more effectively prevents stress concentration on the claw root portion 3a.

また、この玉軸受用冠形樹脂保持器１を軸受に組み込む際に、ボール６が対向する一対の爪３を押し広げるようにしてポケット５内に圧入されるが、この時の爪３および爪根元部３ａの変形も上記と同様の弾性変形を伴うものであるから、爪根元部３ａへの応力の集中が生じない。ポケット５内に挿入されたボール６は、対向する爪３の先端間の間隔Ｈｗが、ボール６の直径Ｄｗよりも狭くされているから、抜け出すことなく安定保持される。さらに、本体部分１Ａは、弾性率が大きく繊維強化された樹脂材料からなるから、軸受使用時の変形を抑え耐久性が確保される。   Further, when the ball bearing crown-shaped resin cage 1 is incorporated in the bearing, the ball 6 is press-fitted into the pocket 5 so as to spread the pair of claws 3 facing each other. Since the deformation of the root portion 3a is accompanied by the same elastic deformation as described above, the stress concentration on the nail root portion 3a does not occur. The ball 6 inserted into the pocket 5 is stably held without coming out because the distance Hw between the tips of the opposing claws 3 is narrower than the diameter Dw of the ball 6. Furthermore, since the main body portion 1A is made of a resin material having a large elastic modulus and fiber reinforced, the body portion 1A is prevented from being deformed when the bearing is used, and durability is secured.

図４および図５は、この玉軸受用冠形樹脂保持器１を用いたアンギュラ玉軸受の例を示す。図４は単列のアンギュラ玉軸受１０を示す。玉軸受用冠形樹脂保持器１は、各ボール６をポケット５内に保持した状態で外輪１１に組み込まれ、その後に内輪１２が組み込まれる。また、図５は複列（図では２列）のアンギュラ玉軸受２０を示す。この玉軸受２０は、両列の外輪２１を共通とし、２列の内輪２２を個別に設けたものである。この場合の玉軸受用冠形樹脂保持器１は２列分準備され、各ボール６をポケット５内に保持した状態で外輪２１に組み込まれ、その後に両列の内輪２２が組み込まれる。   4 and 5 show an example of an angular ball bearing using the crown-shaped resin cage 1 for ball bearings. FIG. 4 shows a single row angular contact ball bearing 10. The ball bearing crown-shaped resin cage 1 is incorporated in the outer ring 11 with each ball 6 held in the pocket 5, and then the inner ring 12 is incorporated. FIG. 5 shows a double row (two rows in the figure) angular contact ball bearing 20. This ball bearing 20 has two rows of outer rings 21 in common and two rows of inner rings 22 provided individually. Two rows of crown-shaped resin cages 1 for ball bearings in this case are prepared, and each ball 6 is held in the pocket 5 and incorporated in the outer ring 21, and then both rows of inner rings 22 are incorporated.

このアンギュラ玉軸受１０，２０の組立の際には、各玉軸受用冠形樹脂保持器１のポケット５内にボール６を爪３の変形を伴い挿入することになるが、爪３はその根元部３ａも含んで弾性率の小さい樹脂材料で構成されているから、その弾性変形により応力が発生せず、根元部３ａの応力集中による白化現象が生じず、また根元部３ａを起点とする破損が生じる懸念もない。さらに、本体部分１Ａは、繊維強化された高強度の樹脂材料で構成されているから、アンギュラ玉軸受１０，２０の使用時において玉軸受用冠形樹脂保持器１自体の変形が抑制されると共に耐久性も確保され、アンギュラ玉軸受１０，２０としての長寿命化にも寄与する。   When the angular ball bearings 10 and 20 are assembled, the balls 6 are inserted into the pockets 5 of the respective crown bearing cages 1 for ball bearings with the deformation of the claws 3. Since it is made of a resin material having a low modulus of elasticity including the portion 3a, no stress is generated due to the elastic deformation, no whitening phenomenon occurs due to stress concentration of the root portion 3a, and breakage starting from the root portion 3a There is no concern that this will occur. Furthermore, since the main body portion 1A is made of a fiber-reinforced high-strength resin material, deformation of the ball bearing crown-shaped resin cage 1 itself is suppressed when the angular ball bearings 10 and 20 are used. Durability is also secured, which contributes to a longer life as the angular ball bearings 10 and 20.

なお、この発明の玉軸受用冠形樹脂保持器は、アンギュラ玉軸受に限らず、深溝玉軸受にも適用することができる。その他、爪３の形状等は図例のものに限定されるものではない。   In addition, the crown-shaped resin cage for ball bearings of this invention can be applied not only to angular ball bearings but also to deep groove ball bearings. In addition, the shape of the nail | claw 3 etc. is not limited to the thing of an illustration.

この発明の一実施形態に係る玉軸受用冠形樹脂保持器の部分平面図である。It is a partial top view of the crown-shaped resin retainer for ball bearings concerning one Embodiment of this invention. 図１におけるＡ−Ｏ−Ｂ線矢視断面図である。FIG. 3 is a cross-sectional view taken along line A-O-B in FIG. 1. 図２におけるＣ−Ｃ線矢視断面図である。It is CC sectional view taken on the line in FIG. この発明の一実施形態にかかる玉軸受用冠形樹脂保持器を組み込んだアンギュラ玉軸受の部分断面図である。It is a fragmentary sectional view of the angular ball bearing which incorporated the crown-shaped resin cage for ball bearings concerning one embodiment of this invention. 同保持器を組み込んだ別のアンギュラ玉軸受の部分断面図である。It is a fragmentary sectional view of another angular contact ball bearing incorporating the cage. 従来の玉軸受用冠形樹脂保持器のポケット部分を示す部分断面図である。It is a fragmentary sectional view which shows the pocket part of the conventional crown-shaped resin cage for ball bearings.

符号の説明Explanation of symbols

１…玉軸受用冠形樹脂保持器
１Ａ…本体部分
２…リング部
３…爪
３ａ…爪の根元部
４…凹部
５…ポケット
６…ボール
１０…単列のアンギュラ玉軸受（玉軸受）
２０…複列のアンギュラ玉軸受（玉軸受）
Ｈｗ…爪の先端間の間隔
Ｄｗ…ボールの直径 DESCRIPTION OF SYMBOLS 1 ... Crown-shaped resin cage 1A for ball bearings ... Body part 2 ... Ring part 3 ... Claw 3a ... Claw root part 4 ... Recess 5 ... Pocket 6 ... Ball 10 ... Single row angular contact ball bearing (ball bearing)
20 ... Double row angular contact ball bearings (ball bearings)
Hw: Distance between the tips of the nails Dw: Diameter of the ball

Claims (4)

リング部と、このリング部から各々軸方向に延びる周方向複数箇所の爪を有し、各爪は一対ずつ互いに対向し、これら対向する各一対の爪の間で前記リング部に凹部が形成され、前記各一対の爪と前記凹部とで、ボールを保持するポケットがそれぞれ形成され、前記対向する爪の先端間の間隔が前記ボールの直径よりも狭く、保持器全体が樹脂製とされた玉軸受用冠形樹脂保持器において、
前記各爪およびこの爪の根元部を、この保持器における他の部位である本体部分よりも弾性率の小さな材料で構成したことを特徴とする玉軸受用冠形樹脂保持器。 The ring portion has a plurality of circumferentially extending claws extending in the axial direction from the ring portion. Each of the claws is opposed to each other in pairs, and a recess is formed in the ring portion between the opposed pair of claws. Each of the pair of claws and the recess has a pocket for holding a ball, the distance between the tips of the opposing claws is narrower than the diameter of the ball, and the entire cage is made of resin. In the crown-shaped resin cage for bearings,
A crown-shaped resin cage for ball bearings, characterized in that each of the nails and the base portion of the nails are made of a material having a smaller elastic modulus than a main body portion which is another part of the cage. 請求項１において、前記本体部分を繊維強化ポリアミド樹脂、爪および爪根元部を非強化のポリアミド樹脂とした玉軸受用冠形樹脂保持器。   2. A crown-shaped resin cage for ball bearings according to claim 1, wherein the main body portion is made of a fiber reinforced polyamide resin, and the claws and the base portion of the claws are made of an unreinforced polyamide resin. 請求項１または請求項２において、前記本体部分と、爪および爪根元部とが、二色成形により異なる樹脂材料で形成されたものである玉軸受用冠形樹脂保持器。   3. A crown-shaped resin cage for ball bearings according to claim 1 or 2, wherein the main body portion, the claw and the claw root portion are formed of different resin materials by two-color molding. 請求項１ないし請求項３のいずれかに記載の玉軸受用冠形樹脂保持器を組み込んだ玉軸受。   A ball bearing incorporating the crown-shaped resin cage for a ball bearing according to any one of claims 1 to 3.
JP2006169099A 2006-06-19 2006-06-19 Resin made crown cage for ball bearing, and ball bearing with the cage Pending JP2007333187A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010190402A (en) * 2009-02-20 2010-09-02 Sii Micro Precision Kk Rolling bearing device and manufacturing method of rolling bearing device
US8104971B2 (en) * 2007-08-28 2012-01-31 Jtekt Corporation Resin cage for ball bearing
US20120087612A1 (en) * 2009-06-29 2012-04-12 Jtekt Corporation Resin cage for angular contact ball bearing
JP2012207699A (en) * 2011-03-29 2012-10-25 Nsk Ltd Ball bearing
US20150330447A1 (en) * 2012-11-16 2015-11-19 Ntn Corporation Crown-shaped retainer
WO2016002681A1 (en) * 2014-07-02 2016-01-07 日本精工株式会社 Crown cage and angular contact ball bearing

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8104971B2 (en) * 2007-08-28 2012-01-31 Jtekt Corporation Resin cage for ball bearing
JP2010190402A (en) * 2009-02-20 2010-09-02 Sii Micro Precision Kk Rolling bearing device and manufacturing method of rolling bearing device
US20120087612A1 (en) * 2009-06-29 2012-04-12 Jtekt Corporation Resin cage for angular contact ball bearing
US8480305B2 (en) * 2009-06-29 2013-07-09 Jtekt Corporation Resin cage for angular contact ball bearing
JP2012207699A (en) * 2011-03-29 2012-10-25 Nsk Ltd Ball bearing
US20150330447A1 (en) * 2012-11-16 2015-11-19 Ntn Corporation Crown-shaped retainer
US9546681B2 (en) * 2012-11-16 2017-01-17 Ntn Corporation Crown shaped retainer
WO2016002681A1 (en) * 2014-07-02 2016-01-07 日本精工株式会社 Crown cage and angular contact ball bearing
JP2016027279A (en) * 2014-07-02 2016-02-18 日本精工株式会社 Crown retainer and angular contact ball bearing
TWI568943B (en) * 2014-07-02 2017-02-01 Nsk Ltd Crown retainer and bevel ball bearing
CN106662152A (en) * 2014-07-02 2017-05-10 日本精工株式会社 Crown cage and angular contact ball bearing

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