JP2016180430A - Cage and ball bearing - Google Patents

Cage and ball bearing Download PDF

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JP2016180430A
JP2016180430A JP2015059730A JP2015059730A JP2016180430A JP 2016180430 A JP2016180430 A JP 2016180430A JP 2015059730 A JP2015059730 A JP 2015059730A JP 2015059730 A JP2015059730 A JP 2015059730A JP 2016180430 A JP2016180430 A JP 2016180430A
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Prior art keywords
cage
gate
pockets
injection molding
ball bearing
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久司 田中
Hisashi Tanaka
久司 田中
山本　卓也
Takuya Yamamoto
卓也 山本
邦裕 松本
Kunihiro Matsumoto
邦裕 松本
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Minebea Co Ltd
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Minebea Co Ltd
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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
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
    • 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
    • F16C2300/00—Application independent of particular apparatuses
    • F16C2300/02—General use or purpose, i.e. no use, purpose, special adaptation or modification indicated or a wide variety of uses mentioned

Abstract

PROBLEM TO BE SOLVED: To secure necessary strength of a weld portion in a crown-type cage used in a ball bearing, manufactured by injection molding, and made of a synthetic resin.SOLUTION: An odd number (seven) of pockets 10 are disposed in a circumferential direction at equal intervals, and recessed portions 11 facing the pockets 10 are formed on an end portion at a side opposite to the pockets 10. A gate 14 for injection molding is disposed on one of the recessed portions 11. A molten resin injected into a cavity of a mold from the gate 14 is branched and flows in a circumferential direction of a cage 5, and merged and joined at a pillar portion 13 between the pockets 10 at an opposite side in a diameter direction of the recessed portion 11 with the gate 14, to form the weld portion 16. As the weld portion 16 is formed on the thick pillar portion 13, necessary strength can be secured. As burr generated on the gate 14 is received in the recessed portion 11, it does not affect the rotation. As the recessed portions 11 are disposed at equal intervals while facing the pockets 10, unbalance of a weight is prevented.SELECTED DRAWING: Figure 2

Description

本発明は、玉軸受の転動体を保持する保持器、及び、この保持器を有する玉軸受に関するものである。   The present invention relates to a cage for holding rolling elements of a ball bearing and a ball bearing having the cage.

転動体として球体を使用する玉軸受においては、軌道内に装填された複数の球体を保持器によって所定間隔をもって転動可能に保持することにより、球体が脱落したり、隣接する球体が接触し合って滑り摩擦を生じたりするのを防止している。   In a ball bearing that uses a sphere as a rolling element, a plurality of spheres loaded in the raceway are held by a cage so that they can roll at a predetermined interval, so that the spheres fall off or adjacent spheres come into contact with each other. This prevents sliding friction.

玉軸受の保持器として、例えば特許文献１に記載されたように、合成樹脂を射出成型することより製造されたものが公知である。このような合成樹脂製の玉軸受を射出成型する場合、次のような問題がある。射出成型用金型のキャビティに溶融樹脂を注入するゲートの切断部にバリが発生するが、このバリが玉軸受の円滑な回転を妨げる原因となることがある。   As a ball bearing retainer, for example, as described in Patent Document 1, one manufactured by injection molding a synthetic resin is known. When injection molding such a synthetic resin ball bearing, there are the following problems. A burr is generated at the cut portion of the gate for injecting the molten resin into the cavity of the injection mold, and this burr may cause a smooth rotation of the ball bearing.

また、ゲートからキャビティ内に注入された溶融樹脂は、保持器の円周方向に沿って分岐してキャビティ内に充填され、ゲートから離れた部位で合流し、接合してウェルド部を形成する。このとき、ウェルド部は、ゲートから離れているため、溶融樹脂の流動性が低下するので、接合強度が低下し易い。特に合成樹脂材料として流動性の低いポリアミドイミドを用いた場合、ウェルド部の強度の低下が問題となる。   Further, the molten resin injected from the gate into the cavity branches along the circumferential direction of the cage, fills the cavity, joins at a site away from the gate, and joins to form a weld portion. At this time, since the weld portion is away from the gate, the fluidity of the molten resin is lowered, and thus the bonding strength is likely to be lowered. In particular, when a polyamideimide having low fluidity is used as the synthetic resin material, a decrease in the strength of the weld portion becomes a problem.

これに対して、上記特許文献１に記載された保持器では、転動体を保持するポケットとは反対側の端面において、各ポケット間の柱部の２箇所に凹部を形成し、これらの凹部にゲートを配置している。また、ポケット間の柱部がウェルド部になるようにゲートを配置している。これにより、ゲートの切断部に発生するバリが凹部内に収容されるので、バリによって玉軸受の円滑な回転が妨げられることがない。また、ウェルド部を厚肉の柱部に形成することにより、ウェルド部の強度を高めることができる。   On the other hand, in the cage described in Patent Document 1, recesses are formed in two portions of the pillars between the pockets on the end surface opposite to the pockets holding the rolling elements, and these recesses are formed in these recesses. The gate is arranged. In addition, the gate is arranged so that the pillar portion between the pockets becomes a weld portion. Thereby, since the burr | flash which generate | occur | produces in the cutting part of a gate is accommodated in a recessed part, the smooth rotation of a ball bearing is not prevented by a burr | flash. Moreover, the strength of the weld portion can be increased by forming the weld portion in the thick pillar portion.

特開２００４−１９７８３１号公報JP 2004-197831 A

しかしながら、上記特許文献１に記載されたものでは、次のような問題がある。
複数のゲートを設けるため、金型の構造が複雑になる。また、ゲートに溶融樹脂を供給するランナの全長が長くなり、合成樹脂材料の歩留まりが悪化する。凹部が不均等に配置されているため、保持器の合成樹脂材料が経時変化等によって収縮した場合、偏った変形が生じて、転動体の保持の精度が低下する虞がある。また、保持器の重量バランスに不均衡が生じて、玉軸受の円滑な回転に悪影響を及ぼす虞がある。 However, the one described in Patent Document 1 has the following problems.
Since a plurality of gates are provided, the mold structure is complicated. In addition, the overall length of the runner that supplies the molten resin to the gate is increased, and the yield of the synthetic resin material is deteriorated. Since the recesses are unevenly arranged, when the synthetic resin material of the cage contracts due to a change with time or the like, a biased deformation may occur, which may reduce the holding accuracy of the rolling elements. Further, an imbalance occurs in the weight balance of the cage, which may adversely affect the smooth rotation of the ball bearing.

本発明は、上記の点に鑑みてなされたものであり、ウェルド部に必要な強度を確保することができ、経時変化等による収縮に対して偏った変形が生じ難く、均等なバランスが得られ、かつ、生産性に優れた保持器、及び、この保持器を有する玉軸受を提供することを目的とする。   The present invention has been made in view of the above points, can ensure the necessary strength for the weld portion, hardly deforms with respect to shrinkage due to aging, etc., and provides an even balance. And it aims at providing a cage excellent in productivity, and a ball bearing which has this cage.

上記の課題を解決するために、請求項１に係る発明は、玉軸受の転動体を保持する複数のポケットが軸方向の一端部に開口し、射出成型によって製造される合成樹脂製の冠型の保持器において、
前記複数のポケットは、円周方向に沿って等間隔で奇数個配置されて、隣接する前記各ポケット間に柱部が形成され、
前記複数のポケットの反対側の端部に、前記ポケットに臨んで複数の凹部が等間隔に形成され、
前記複数の凹部のうちの１つのみに、射出成型用のゲートが接続されるゲート部が形成され、
前記ゲート部が形成された前記凹部に対して前記保持器の直径方向の反対側に配置された前記柱部に、射出成型時に前記ゲートから前記保持器の円周方向に沿って分岐した溶融樹脂が合流して接合するウェルド部が形成されていることを特徴とする。
請求項２の発明に係る保持器は、上記請求項１の構成において、前記凹部は、前記ポケットと同数設けられていることを特徴とする。
請求項３の発明に係る保持器は、上記請求項１又は２の構成において、前記合成樹脂は、ポリアミドイミドであることを特徴とする。
請求項４の発明に係る玉軸受は、上記請求項１乃至３のいずれか１項に記載の保持器を有することを特徴とする。 In order to solve the above problems, the invention according to claim 1 is a synthetic resin crown mold in which a plurality of pockets holding rolling elements of a ball bearing are opened at one end in the axial direction and are manufactured by injection molding. In the cage of
The plurality of pockets are arranged at odd intervals along the circumferential direction, and a pillar portion is formed between the adjacent pockets.
At the opposite end of the plurality of pockets, a plurality of recesses are formed at equal intervals facing the pocket,
A gate portion to which an injection molding gate is connected is formed only in one of the plurality of recesses,
Molten resin branched from the gate along the circumferential direction of the cage at the time of injection molding to the column portion arranged on the opposite side of the cage in the diameter direction with respect to the recess in which the gate portion is formed The weld portion is formed by joining and joining.
According to a second aspect of the present invention, there is provided a cage according to the first aspect, wherein the same number of the concave portions as the pockets are provided.
According to a third aspect of the present invention, there is provided the cage according to the first or second aspect, wherein the synthetic resin is polyamideimide.
The ball bearing which concerns on invention of Claim 4 has the holder | retainer of any one of the said Claim 1 thru | or 3, It is characterized by the above-mentioned.

請求項１の発明に係る保持器によれば、厚肉の柱部にウェルド部を形成することにより、ウェルド部の強度を高めることができる。凹部にゲート部を配置することにより、ゲート部に生じるバリが凹部内に収容されるので、バリが玉軸受の円滑な回転を妨げることがない。ゲートを１つのみとすることにより、ゲートに溶融樹脂を供給するランナを少なくして射出成型用の金型を簡素化し、さらに合成樹脂材料の歩留まりを向上させることができる。凹部を等間隔に配置することで、保持器の回転バランスを悪化させることが避けられる。ウェルド部が柱部に形成されるため、流動性の低いポリアミドイミドを用いても強度の低下を抑えることができる。
請求項２の発明に係る保持器によれば、経時変化等による収縮に対して偏った変形が生じ難く、均等なバランスを得ることができる。
請求項３の発明に係る保持器によれば、耐熱性の高い保持器を製造することができる。
請求項４の発明に係る保持器によれば、上記請求項１乃至３の保持器を有する玉軸受を提供することができる。 According to the cage of the first aspect of the present invention, the strength of the weld portion can be increased by forming the weld portion in the thick pillar portion. By arranging the gate portion in the recess, the burr generated in the gate portion is accommodated in the recess, so that the burr does not hinder the smooth rotation of the ball bearing. By using only one gate, the number of runners for supplying molten resin to the gate can be reduced, the mold for injection molding can be simplified, and the yield of the synthetic resin material can be improved. By arranging the recesses at equal intervals, it is possible to avoid deteriorating the rotational balance of the cage. Since the weld portion is formed in the column portion, a decrease in strength can be suppressed even when a polyamideimide having low fluidity is used.
According to the cage of the second aspect of the present invention, deformation biased against contraction due to changes over time or the like is unlikely to occur, and an even balance can be obtained.
According to the cage according to the invention of claim 3, a cage having high heat resistance can be manufactured.
According to the cage according to the invention of claim 4, a ball bearing having the cage of claims 1 to 3 can be provided.

本発明の一実施形態に係る保持器を使用した玉軸受の縦断面図である。It is a longitudinal section of a ball bearing using a cage concerning one embodiment of the present invention. 本発明の一実施形態に係る保持器の斜視図である。It is a perspective view of the holder | retainer which concerns on one Embodiment of this invention. 図２に示す保持器の平面図である。It is a top view of the holder | retainer shown in FIG. 図２に示す保持器の側壁の要部を展開して示す図である。It is a figure which expands and shows the principal part of the side wall of the holder | retainer shown in FIG.

以下、本発明の一実施形態を図面に基づいて詳細に説明する。
図１に示すように、本実施形態に係る玉軸受１は、外輪２と、内輪３と、これらの間に装填された複数のボール４と、ボール４を保持する保持器５と、を備えている。外輪２の両端部には、外輪２と内輪３との間を覆うシールド６が取付けられている。また、外輪２と内輪３との間の軸受空間には、グリース７が保持されている。なお、図示の例では、玉軸受１は、グリースが封入されたシールドベアリングとして示されているが、シールド６及びグリース７は、適宜、省略してもよい。 Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
As shown in FIG. 1, a ball bearing 1 according to the present embodiment includes an outer ring 2, an inner ring 3, a plurality of balls 4 loaded therebetween, and a cage 5 that holds the balls 4. ing. Shields 6 that cover the space between the outer ring 2 and the inner ring 3 are attached to both ends of the outer ring 2. Grease 7 is held in the bearing space between the outer ring 2 and the inner ring 3. In the illustrated example, the ball bearing 1 is shown as a shield bearing filled with grease, but the shield 6 and the grease 7 may be omitted as appropriate.

外輪２の内周面に形成され、円周方向に延びてボール４と接触する軌道溝８と、内輪３の外周面に形成され、円周方向に沿って延びてボール４と接触する軌道溝９とで形成された軌道に転動体である複数（図示の例では７個）のボール４が装填されている。各ボール４は、合成樹脂製の冠型の保持器５によって回転可能に保持されて軌道内に等間隔で配置されている。   A raceway groove 8 formed on the inner circumferential surface of the outer ring 2 and extending in the circumferential direction to contact the ball 4, and a raceway groove formed on the outer circumferential surface of the inner ring 3 and extending along the circumferential direction to contact the ball 4. 9 are loaded with a plurality of (seven in the illustrated example) balls 4 as rolling elements. The balls 4 are rotatably held by a synthetic resin crown-shaped cage 5 and are arranged at equal intervals in the track.

次に、保持器５について、図２乃至図４を参照して説明する。
図２乃至図４に示すように、保持器５は、冠型の保持器であり、略円筒形状の一端部に、転動体であるボール４を保持する略球面上の凹部である複数のポケット１０が円周方向に沿って等間隔で形成されている。ポケット１０は、保持器５の内周面、外周面及び一端面に開口して、ボール４をはめ込むことができ、ボール４を略球面状の内面に沿って回転可能に保持する。保持器５には、奇数個（図示の例では７個）のポケット１０が円周方向に沿って等間隔で配置されている。 Next, the cage 5 will be described with reference to FIGS.
As shown in FIGS. 2 to 4, the cage 5 is a crown-shaped cage, and has a plurality of pockets that are concave portions on a substantially spherical surface that holds the ball 4 that is a rolling element at one end portion of a substantially cylindrical shape. 10 are formed at equal intervals along the circumferential direction. The pocket 10 opens on the inner peripheral surface, the outer peripheral surface, and one end surface of the cage 5, can fit the ball 4, and holds the ball 4 rotatably along the substantially spherical inner surface. In the cage 5, odd (seven in the illustrated example) pockets 10 are arranged at equal intervals along the circumferential direction.

保持器５のポケット１０とは反対側の端部には、径方向沿って内周部から外周部まで放射状に延びる断面形状が長方形の溝状の凹部１１が形成されている。凹部１１は、保持器５の円周方向に沿って等間隔で奇数個（図示の例では７個）、各ポケット１０に臨んで配置されている。これにより、ポケット１０と凹部１１との間に、軸方向の肉厚が薄い薄肉部１２が形成され、また、隣接する各ポケット１０及び凹部１１間に、軸方向の肉厚が厚い柱部１３が形成されている。   A groove-shaped recess 11 having a rectangular cross-sectional shape extending radially from the inner periphery to the outer periphery along the radial direction is formed at the end of the cage 5 opposite to the pocket 10. The recesses 11 are arranged at odd intervals (seven in the illustrated example) at equal intervals along the circumferential direction of the cage 5 so as to face the pockets 10. As a result, a thin-walled portion 12 with a small axial thickness is formed between the pocket 10 and the concave portion 11, and a column portion 13 with a thick axial thickness is formed between each adjacent pocket 10 and the concave portion 11. Is formed.

保持器５は、フェノール樹脂、ポリアミド樹脂、ポリアセタール樹脂、フッ素樹脂等の合成樹脂を射出成型して製造される。保持器５を射出成型する際、金型（図示せず）のキャビティに溶融樹脂を注入するゲート１４（仮想線の矢印で示す）が、奇数個の凹部１１のうちの１つのみの底部に接続するように配置されている。これにより、ゲート１４が接続される凹部１１の底部には、ゲート１４内に残留した合成樹脂材料を切断した部分であるゲート部１５（図３及び図４参照）が形成される。凹部１１の深さは、図４に示すように、ゲート部１５に生じるバリ１５Ａの大きさを考慮し、このバリ１５Ａが凹部１１内に収容されて保持器５の端面から突出しない深さとする。なお、凹部１１は、図示の溝状に限らず、ゲート部１５に生じるバリ１５Ａを収容でき、かつ、射出成型によって成型可能な形状であればよい。   The cage 5 is manufactured by injection molding a synthetic resin such as a phenol resin, a polyamide resin, a polyacetal resin, or a fluororesin. When the cage 5 is injection-molded, a gate 14 (indicated by an imaginary line arrow) for injecting molten resin into a cavity of a mold (not shown) is provided at the bottom of only one of the odd number of recesses 11. Arranged to connect. As a result, a gate portion 15 (see FIGS. 3 and 4), which is a portion obtained by cutting the synthetic resin material remaining in the gate 14, is formed at the bottom of the recess 11 to which the gate 14 is connected. As shown in FIG. 4, the depth of the recess 11 takes into account the size of the burr 15 </ b> A generated in the gate portion 15, and the burr 15 </ b> A is accommodated in the recess 11 and does not protrude from the end face of the cage 5. . The recess 11 is not limited to the illustrated groove shape, and may be any shape that can accommodate the burr 15A generated in the gate portion 15 and can be molded by injection molding.

また、金型のキャビティ内に注入された溶融樹脂は、ゲート１４から保持器５の円周方向に沿って分岐して流動し、ゲート１４が配置された凹部１１の直径方向の反対側の柱部１３で合流してキャビティ内に充填され、この合流部分で合成樹脂材料が互いに接合されてウェルド部１６を形成する。ウェルド部１６は、ゲート１４から最も離れており、溶融樹脂の凝固が進行して流動性が低下するため、合成樹脂材料の接合が充分に行われず、他の部分に比して強度が低下し易い。ゲート１４から最も離れた直径方向の反対側となるウェルド部１６は、ポケット１０及び凹部１１が円周方向に沿って等間隔で奇数個配置されていることから、柱部１３の１つに配置されることになる。   Also, the molten resin injected into the cavity of the mold branches and flows along the circumferential direction of the cage 5 from the gate 14 and flows, and the column on the opposite side of the diametrical direction of the recess 11 in which the gate 14 is disposed. The portions 13 join to fill the cavity, and the synthetic resin materials are joined to each other at the joining portion to form the weld portion 16. The weld portion 16 is farthest from the gate 14, and solidification of the molten resin progresses to lower the fluidity, so that the synthetic resin material is not sufficiently joined, and the strength is reduced as compared with other portions. easy. The weld portion 16 on the opposite side in the diametrical direction farthest from the gate 14 is arranged in one of the column portions 13 because the pockets 10 and the recesses 11 are arranged at odd intervals along the circumferential direction. Will be.

保持器５の各部の寸法、及び、射出成型条件は、ポケット１０と凹部１１との間に形成される軸方向の肉厚が薄い各薄肉部１２の強度が、軸方向の肉厚の厚い柱部１３の１つに形成されたウェルド部１６の強度と同等、又は、同等以上となるように、適宜、設定する。   The dimensions of each part of the cage 5 and the injection molding conditions are such that the strength of each thin part 12 formed between the pocket 10 and the recessed part 11 and having a small axial thickness is thicker in the axial direction. The strength is appropriately set so as to be equal to or greater than the strength of the weld portion 16 formed in one of the portions 13.

以上のように構成した本実施形態の作用について次に説明する。
保持器５は、合成樹脂材料を射出成型することにより製造され、玉軸受１の外輪２と内輪３との間に挿入して、各ポケット１０にボール４をはめ込むことにより、ボール４を保持して、ボール４の円滑な転動を可能にする。 Next, the operation of the present embodiment configured as described above will be described.
The cage 5 is manufactured by injection molding a synthetic resin material. The cage 5 is inserted between the outer ring 2 and the inner ring 3 of the ball bearing 1 to hold the ball 4 by fitting the ball 4 into each pocket 10. Thus, the ball 4 can smoothly roll.

保持器５は、強度的に不利なウェルド部１６を軸方向に厚肉の柱部１３に配置することにより、必要な強度を確保し易くなる。これにより、溶融樹脂の流動性が低いポリアミドイミドを合成樹脂材料とした場合でも、ウェルド部１６に必要な強度を確保することができる。また、薄肉部１２の強度をウェルド部１６の強度と同等、又は、同等以上とすることにより、全体として必要な強度を効率よく確保することができる。すなわち、薄肉部１２は、構造上、強度が低下し易いが、その強度をウェルド部１６の強度と同等、又は、同等以上とすることにより、ウェルド部１６よりも先に破損することがないので、強度が最も低いウェルド部１６の強度を確保することにより、全体として必要な強度を得ることができる。このとき、薄肉部１２は、溶融樹脂の接合部となっていないので、ウェルド部１６に比して、容易に高い強度を得ることができる。   The retainer 5 is easy to ensure the required strength by arranging the weld portion 16, which is disadvantageous in strength, in the thick pillar portion 13 in the axial direction. Thereby, even when a polyamideimide having a low fluidity of the molten resin is used as a synthetic resin material, the strength required for the weld portion 16 can be ensured. Moreover, the intensity | strength required as a whole can be efficiently ensured by making the intensity | strength of the thin part 12 into the equivalent of the intensity | strength of the weld part 16, or more than equivalent. That is, the strength of the thin wall portion 12 is likely to be lowered due to the structure, but if the strength is equal to or greater than the strength of the weld portion 16, it is not damaged before the weld portion 16. By securing the strength of the weld portion 16 having the lowest strength, the necessary strength as a whole can be obtained. At this time, since the thin wall portion 12 is not a joint portion of the molten resin, a high strength can be easily obtained as compared with the weld portion 16.

保持器５を射出成型する際、ゲート１４が１ケ所のみに設けられているので、金型を簡素化することができ、また、ゲート１４内に残留する溶融樹脂が少なくなるので、合成樹脂材料の歩留まりが良い。ゲート１４を凹部１４内に配置したことにより、ゲート内に残留し合成樹脂材料を切断したゲート部１５に生じるバリ１５Ａが凹部１４内に収容され、保持器５の端面から突出しない。このため、バリ１５Ａが玉軸受１の円滑な回転を妨げることがないので、バリ１５Ａを除去する必要がない。   When the cage 5 is injection-molded, the gate 14 is provided only in one place, so that the mold can be simplified and the molten resin remaining in the gate 14 is reduced. Yield is good. By disposing the gate 14 in the recess 14, the burr 15 </ b> A generated in the gate portion 15 remaining in the gate and cutting the synthetic resin material is accommodated in the recess 14 and does not protrude from the end face of the cage 5. For this reason, since the burr 15A does not hinder the smooth rotation of the ball bearing 1, it is not necessary to remove the burr 15A.

凹部１１は、円周方向に沿って等間隔で配置されているので、保持器５の重量バランスに不均衡が生じることがなく、玉軸受１の回転時のバランスを良好に維持することができる。また、経時変化等により、保持器５の合成樹脂材料が収縮した場合でも、偏った変形が生じることがなく、安定してボール４を保持することができる。   Since the recesses 11 are arranged at equal intervals along the circumferential direction, there is no imbalance in the weight balance of the cage 5, and the balance during rotation of the ball bearing 1 can be maintained well. . Further, even when the synthetic resin material of the cage 5 contracts due to a change over time or the like, the ball 4 can be stably held without causing uneven deformation.

なお、本実施形態において、保持器５は、ポケット１０の周囲の合成樹脂材料を適宜、肉抜してもよく、これにより、例えば、特許文献１に記載されたもののように、ボール４を保持する爪部が保持器の端部から突出するような形状としてもよい。また、保持器５を有する玉軸受としては、図１に示すもののほか、冠型の保持器を有するものであれば他の形式の玉軸受でもよい。   In the present embodiment, the cage 5 may appropriately remove the synthetic resin material around the pocket 10, thereby holding the ball 4, for example, as described in Patent Document 1. It is good also as a shape where the nail | claw part to perform protrudes from the edge part of a holder | retainer. Further, as the ball bearing having the cage 5, other types of ball bearings may be used as long as they have a crown-shaped cage in addition to the one shown in FIG.

１…玉軸受、４…ボール（転動体）、５…保持器、１０…ポケット、１１…凹部、１３…柱部、１４…ゲート、１５…ゲート部、１６…ウェルド部   DESCRIPTION OF SYMBOLS 1 ... Ball bearing, 4 ... Ball (rolling element), 5 ... Cage, 10 ... Pocket, 11 ... Recessed part, 13 ... Column part, 14 ... Gate, 15 ... Gate part, 16 ... Weld part

Claims (4)

玉軸受の転動体を保持する複数のポケットが軸方向の一端部に開口し、射出成型によって製造される合成樹脂製の冠型の保持器において、
前記複数のポケットは、円周方向に沿って等間隔で奇数個配置されて、隣接する前記各ポケット間に柱部が形成され、
前記複数のポケットの反対側の端部に、前記ポケットに臨んで複数の凹部が等間隔に形成され、
前記複数の凹部のうちの１つのみに、射出成型用のゲートが接続されるゲート部が形成され、
前記ゲート部が形成された前記凹部に対して前記保持器の直径方向の反対側に配置された前記柱部に、射出成型時に前記ゲートから前記保持器の円周方向に沿って分岐した溶融樹脂が合流して接合するウェルド部が形成されていることを特徴とする保持器。 In a crown-shaped cage made of synthetic resin, a plurality of pockets holding rolling elements of ball bearings are opened at one end in the axial direction, and manufactured by injection molding.
The plurality of pockets are arranged at odd intervals along the circumferential direction, and a pillar portion is formed between the adjacent pockets.
At the opposite end of the plurality of pockets, a plurality of recesses are formed at equal intervals facing the pocket,
A gate portion to which an injection molding gate is connected is formed only in one of the plurality of recesses,
Molten resin branched from the gate along the circumferential direction of the cage at the time of injection molding to the column portion arranged on the opposite side of the cage in the diameter direction with respect to the recess in which the gate portion is formed A retainer is formed in which a weld portion is formed by joining and joining. 前記凹部は、前記ポケットと同数設けられていることを特徴とする請求項１に記載の保持器。   The retainer according to claim 1, wherein the same number of the recesses as the pockets are provided. 前記合成樹脂は、ポリアミドイミドであることを特徴とする請求項１又は２に記載の保持器。   The cage according to claim 1 or 2, wherein the synthetic resin is polyamideimide. 請求項１乃至３のいずれか１項に記載の保持器を有することを特徴とする玉軸受。   A ball bearing comprising the cage according to any one of claims 1 to 3.
JP2015059730A 2015-03-23 2015-03-23 Cage and ball bearing Pending JP2016180430A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109027009A (en) * 2018-09-20 2018-12-18 邓四二 A kind of bearing retainer and bearing
CN115263916A (en) * 2022-08-18 2022-11-01 广德中隆轴承有限公司 Ultra-silent thin-wall bearing used for high rotating speed

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109027009A (en) * 2018-09-20 2018-12-18 邓四二 A kind of bearing retainer and bearing
CN109027009B (en) * 2018-09-20 2020-04-28 邓四二 Bearing retainer and bearing
CN115263916A (en) * 2022-08-18 2022-11-01 广德中隆轴承有限公司 Ultra-silent thin-wall bearing used for high rotating speed

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