JP2016114102A - Manufacturing method for bearing cage - Google Patents

Manufacturing method for bearing cage Download PDF

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JP2016114102A
JP2016114102A JP2014251170A JP2014251170A JP2016114102A JP 2016114102 A JP2016114102 A JP 2016114102A JP 2014251170 A JP2014251170 A JP 2014251170A JP 2014251170 A JP2014251170 A JP 2014251170A JP 2016114102 A JP2016114102 A JP 2016114102A
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resin
regions
region
center
pockets
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JP6413729B2 (en
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吉和 倉本
Yoshikazu Kuramoto
吉和 倉本
相原　成明
Shigeaki Aihara
成明 相原
隆之 平本
Takayuki Hiramoto
隆之 平本
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NSK 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
    • 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 provide a manufacturing method for a bearing cage which can suppress the lowering of rigidity.SOLUTION: Resin sumps 40 in first and second regions S1, S2 are arranged in a center of a peripheral direction of one column 20 out of a pair of the columns 20 which adjoin pockets 30 located in centers of peripheral directions of the first and second regions S1, S2. The resin sump 40 in a third region S3 is arranged in a center of a peripheral direction of the column 20 located in a center of a peripheral direction of the third region S3. A cross section area of a communication part 42 of the resin sump 40 communicating with the column 20 is not larger than one quarter of a cross section area of the resin injection gate 51.SELECTED DRAWING: Figure 1

Description

本発明は、軸受用保持器の製造方法に関する。   The present invention relates to a method for manufacturing a bearing cage.

一般的に、軸受用保持器は、射出成形により製造される。具体的には、図７に示すように、成形金型内に成形体である軸受用保持器に対応する環状のキャビティ１４０を形成し、このキャビティ１４０の周縁部に設けた樹脂射出ゲート１５０から溶解された樹脂材料（熱可塑性樹脂）を注入し、冷却固化することによって製造される。   Generally, the bearing cage is manufactured by injection molding. Specifically, as shown in FIG. 7, an annular cavity 140 corresponding to a bearing cage that is a molded body is formed in a molding die, and a resin injection gate 150 provided at the peripheral portion of the cavity 140 is used. It is manufactured by injecting a dissolved resin material (thermoplastic resin) and solidifying by cooling.

キャビティ１４０に注入された溶解樹脂は、キャビティ１４０内を周方向両側に二つの流れとなって流動し、樹脂射出ゲート１５０と径方向に対向する反対側の位置で再び合流し、相互に接合され、ウェルド１００Ｗが形成される。一般に、この様に射出成形された軸受用樹脂製保持器は、溶解樹脂が融着一体化しただけのものであるため、溶解樹脂の均一な混合が起こらず、ウェルド１００Ｗにおいて強度が低下することがよく知られている。   The molten resin injected into the cavity 140 flows into the cavity 140 as two flows on both sides in the circumferential direction, and merges again at a position opposite to the resin injection gate 150 in the radial direction and joined to each other. , A weld 100W is formed. Generally, since the resin cage for bearings thus molded by injection is only one in which the molten resin is fused and integrated, uniform mixing of the molten resin does not occur, and the strength decreases in the weld 100W. Is well known.

また、溶解樹脂に、強化材料としてガラス繊維、炭素繊維、金属繊維等の補強繊維材を添加したものでは、ウェルド１００Ｗにおいて補強繊維材が溶解樹脂の流動方向に対し垂直に配向するため、補強効果が発現しない。さらに、ウェルド１００Ｗ以外の部分では、補強繊維材が溶解樹脂の流動方向に対し平行に配向するため、当該部分とウェルドとの強度差が大きくなってしまう。   Further, when a reinforcing fiber material such as glass fiber, carbon fiber, or metal fiber is added as a reinforcing material to the molten resin, the reinforcing fiber material is oriented perpendicular to the flowing direction of the molten resin in the weld 100W. Does not develop. Furthermore, in portions other than the weld 100W, the reinforcing fiber material is oriented in parallel with the flow direction of the dissolved resin, so that the strength difference between the portion and the weld becomes large.

このように、射出成形により製造された軸受用樹脂製保持器は、強度が弱いウェルドから破損することが多い。特に、ウェルドが、最も応力集中し易い部位（例えば、ポケットにおいて最も軸方向の肉厚が薄いポケット底や、円環部と柱部とが交差する隅Ｒ部）に形成されると、当該部位に損傷が発生し易くなり、保持器の耐久性が損なわれてしまう。そこで、従来より、以下に示すような対策がなされてきた。   Thus, the resin cage for bearings manufactured by injection molding often breaks from weak welds. In particular, when the weld is formed at a portion where stress is most easily concentrated (for example, at the pocket bottom where the wall thickness is the thinnest in the pocket, or at the corner R portion where the annular portion and the column portion intersect), the portion. Damage tends to occur, and the durability of the cage is impaired. Therefore, conventionally, the following countermeasures have been taken.

特許文献１の合成樹脂製保持器の製造方法では、成型金型のキャビティの円周方向複数個所にそれぞれゲートが設けられる。また、これらゲート間の複数の領域のうち、一部の領域の円周方向距離が他の領域の円周方向距離より長く設定され、円周方向距離が長い領域内における注入樹脂材料の合流個所にのみ樹脂溜めが設けられる。これにより、合流した注入樹脂材料を、キャビティから樹脂溜めに流れ込ませ、ウェルド強度の低下を防止することを図っている。   In the method for manufacturing a synthetic resin cage of Patent Document 1, gates are provided at a plurality of locations in the circumferential direction of the cavity of the molding die. Further, among the plurality of regions between the gates, the circumferential distance of some regions is set to be longer than the circumferential distance of other regions, and the injection resin material merging point in the region having a long circumferential distance Only the resin reservoir is provided. Thus, the injected injected resin material is caused to flow from the cavity into the resin reservoir to prevent the weld strength from being lowered.

特許文献２の樹脂製保持器では、ポケット部の総数が奇数とされると共に、ゲート間ごとに配置されるポケット部の数が最も均等になる数とされている。湯溜まりは、ポケット部が奇数となるゲート間の周方向中央に位置するポケット部の両端部に形成される柱部のいずれか一方に位置づけられる。これにより、ポケット部が奇数となるゲート間の領域に形成されるウェルドを、ポケット部の底部から周方向に外れた位置に形成し、保持器の剛性を向上することを図っている。   In the resin cage of Patent Document 2, the total number of pocket portions is an odd number, and the number of pocket portions arranged between the gates is the most even. The hot water pool is positioned at one of the pillar portions formed at both ends of the pocket portion located at the center in the circumferential direction between the gates where the pocket portion is an odd number. Thereby, the weld formed in the region between the gates where the pocket portion is odd is formed at a position deviated in the circumferential direction from the bottom portion of the pocket portion, thereby improving the rigidity of the cage.

特許第３６６６５３６号公報Japanese Patent No. 3666536 特開２００８−０９５７７０号公報JP 2008-095770 A

しかしながら、特許文献１記載の製造方法では、注入樹脂材料の合流箇所、すなわちウェルド形成位置と一致する位置に樹脂溜めを設けている。したがって、キャビティと連通する樹脂溜めの連通部（開口部）近傍で、補強繊維材が樹脂材料の流動方向に対して垂直に配向し易く、ウェルド補強効果が十分に得られないという問題がある。   However, in the manufacturing method described in Patent Document 1, a resin reservoir is provided at a joint location of the injected resin material, that is, a position that coincides with the weld formation position. Therefore, there is a problem that the reinforcing fiber material is easily oriented perpendicular to the flow direction of the resin material in the vicinity of the communication portion (opening) of the resin reservoir communicating with the cavity, and the weld reinforcement effect cannot be sufficiently obtained.

特許文献２記載の樹脂製保持器では、湯溜まりが設けられていない、ポケット部が偶数となるゲート間の領域では、柱部に溶解樹脂が溶着一体化しただけであるウェルドが形成されてしまうため、使用条件によってはウェルド強度が不十分になる可能性がある。   In the resin cage described in Patent Document 2, in the region between the gates where there is no hot water pool and the pocket portion is an even number, a weld is formed in which the molten resin is simply welded and integrated with the pillar portion. Therefore, the weld strength may be insufficient depending on the use conditions.

本発明は、上述した課題を鑑みてなされたものであり、その目的は、強度低下を抑制可能な軸受用保持器の製造方法を提供することにある。   This invention is made | formed in view of the subject mentioned above, The objective is to provide the manufacturing method of the cage for bearings which can suppress a strength fall.

本発明の上記目的は、下記の構成により達成される。
（１） 成形金型内に形成した略円環状のキャビティの周縁部に設けられた３個の樹脂射出ゲートから、溶解樹脂を前記キャビティ内に射出することによって成形される軸受用保持器の製造方法であって、
前記軸受用保持器は、
略円環状の基部と、
前記基部の軸方向一端側面から、周方向に所定の間隔で軸方向に突出する３の倍数でない偶数個の柱部と、
隣り合う一対の前記柱部の互いに対向する面と前記基部の軸方向一端側面とによって形成された、前記柱部と同数のポケットと、
を有し、
隣り合う前記樹脂射出ゲートの間の領域を、それぞれ第１〜第３領域とすると、
前記第１及び第２領域における前記ポケットの数は、互いに等しく、且つ、奇数個であり、
前記第３領域における前記ポケットの数は、偶数個であり、且つ、前記第１及び第２領域の前記ポケットの数より１個多く又は１個少なく、
前記第１及び第２領域を分ける前記樹脂射出ゲートは、前記柱部の周方向中央から前記第１領域側にずれた位置に設けられ、
前記第２及び第３領域を分ける前記樹脂射出ゲートは、前記柱部の周方向中央から前記第３領域側にずれた位置に設けられ、
前記第３及び第１領域を分ける前記樹脂射出ゲートは、前記柱部の周方向中央から前記第１領域側にずれた位置に設けられ、
前記第１〜第３領域の前記柱部には、それぞれ前記溶解樹脂を貯留可能な樹脂溜りが設けられ、
前記第１及び第２領域における前記樹脂溜りは、前記第１及び第２領域のそれぞれ周方向中央に位置する前記ポケットに隣り合う一対の前記柱部のうち、一方の前記柱部の周方向中央に設けられ、
前記第３領域における前記樹脂溜りは、前記第３領域の周方向中央に位置する前記柱部の周方向中央に設けられ、
前記柱部と連通する前記樹脂溜りの連通部の断面積は、前記樹脂射出ゲートの断面積の１／４以下である
ことを特徴とする軸受用保持器の製造方法。 The above object of the present invention can be achieved by the following constitution.
(1) Manufacture of a bearing cage molded by injecting a molten resin into the cavity from three resin injection gates provided at the peripheral edge of a substantially annular cavity formed in the molding die. A method,
The bearing cage is
A substantially annular base;
An even number of pillar portions that are not a multiple of 3 projecting in the axial direction at predetermined intervals in the circumferential direction from the axial one end side surface of the base portion;
The same number of pockets as the pillars formed by the mutually opposing surfaces of a pair of adjacent pillars and the axial one end side surface of the base;
Have
When the regions between the resin injection gates adjacent to each other are first to third regions,
The number of the pockets in the first and second regions is equal to each other and an odd number;
The number of the pockets in the third region is an even number, and one more or one less than the number of the pockets in the first and second regions,
The resin injection gate that divides the first and second regions is provided at a position shifted from the circumferential center of the column portion toward the first region,
The resin injection gate that divides the second and third regions is provided at a position shifted from the circumferential center of the column portion toward the third region,
The resin injection gate that divides the third and first regions is provided at a position shifted from the circumferential center of the column portion toward the first region.
Each of the pillar portions of the first to third regions is provided with a resin reservoir capable of storing the dissolved resin,
The resin reservoir in the first and second regions is a circumferential center of one of the pair of column portions adjacent to the pockets located in the circumferential center of each of the first and second regions. Provided in
The resin reservoir in the third region is provided in the center in the circumferential direction of the column portion located in the center in the circumferential direction of the third region,
The bearing cage manufacturing method according to claim 1, wherein a cross-sectional area of the communication portion of the resin reservoir communicating with the column portion is ¼ or less of a cross-sectional area of the resin injection gate.

本発明の軸受用保持器の製造方法によれば、ウェルド形成位置と樹脂溜り配置位置とが周方向にずれ、ウェルドと樹脂溜りとの間に溶解樹脂の圧力勾配を生じ易くなる。したがって、当該圧力勾配に起因する強制的な樹脂の流動が起きることで、ウェルドにおいて補強繊維材が溶解樹脂の流動方向に対し垂直に配向することを抑制することができる。特に、樹脂溜りが柱部の周方向中央に配置されているので、ウェルドから樹脂溜りに向かって流路断面積が拡大する方向に溶解樹脂の強制的な流動が発生する。したがって、ウェルドにおける繊維配向の乱れた領域が、断面積の広い部分に移動するため、ウェルド強度をより向上させる効果を有する。また、樹脂溜りの連通部の断面積は、樹脂射出ゲートの断面積の１／４以下であるので、溶解樹脂が合流した後で樹脂溜りへの溶解樹脂の流入が始まり、ウェルドにおける強制的な樹脂の流動によって補強繊維材の配向を制御する効果をより確実に発現することができる。   According to the bearing cage manufacturing method of the present invention, the weld forming position and the resin reservoir disposition position are shifted in the circumferential direction, and a pressure gradient of the dissolved resin is easily generated between the weld and the resin reservoir. Therefore, the forced resin flow caused by the pressure gradient can prevent the reinforcing fiber material from being oriented perpendicular to the flow direction of the dissolved resin in the weld. In particular, since the resin reservoir is disposed at the center in the circumferential direction of the column portion, a forced flow of the dissolved resin occurs in a direction in which the flow path cross-sectional area increases from the weld toward the resin reservoir. Therefore, since the region in which the fiber orientation is disturbed in the weld moves to a portion having a large cross-sectional area, the weld strength is further improved. Further, since the cross-sectional area of the communication portion of the resin reservoir is ¼ or less of the cross-sectional area of the resin injection gate, the inflow of the molten resin into the resin reservoir starts after the molten resin merges, and the forced in the weld The effect of controlling the orientation of the reinforcing fiber material by the flow of the resin can be expressed more reliably.

第１実施形態に係る製造方法によって製造された冠形保持器の平面図である。It is a top view of the crown-shaped cage manufactured by the manufacturing method concerning a 1st embodiment. 第２実施形態に係る製造方法によって製造された冠形保持器の平面図である。It is a top view of the crown-shaped cage manufactured by the manufacturing method concerning a 2nd embodiment. 実施例１において、溶解樹脂が流動する様子を示す図である。In Example 1, it is a figure which shows a mode that melt | dissolution resin flows. 比較例１において、溶解樹脂が流動する様子を示す図である。In comparative example 1, it is a figure showing signs that melted resin flows. 比較例２において、溶解樹脂が流動する様子を示す図である。In Comparative example 2, it is a figure which shows a mode that melt | dissolution resin flows. 比較例３において、溶解樹脂が流動する様子を示す図である。In comparative example 3, it is a figure showing signs that dissolution resin flows. 従来の軸受用保持器の製造方法に使用する成形金型の断面図である。It is sectional drawing of the shaping die used for the manufacturing method of the conventional bearing retainer.

以下、本発明に係る軸受用保持器の製造方法の各実施形態を図面に基づいて詳細に説明する。   Hereinafter, each embodiment of the manufacturing method of the bearing retainer concerning the present invention is described in detail based on a drawing.

（第１実施形態）
図１には、本実施形態の軸受用保持器１（以後、単に保持器と呼ぶことがある。）が示されている。保持器１は、いわゆる冠形保持器であり、略円環状の基部１０と、基部１０の軸方向一端側面１２から、周方向に所定間隔で軸方向に突出する３の倍数でない偶数個（本実施形態では１４個）の柱部２０と、隣り合う一対の柱部２０、２０の互いに対向する面２２、２２と基部１０の軸方向一端側面１２とによって形成され、軸受の転動体（不図示）を保持する３の倍数でない偶数個（本実施形態では１４個）のポケット３０と、を有している。すなわち、柱部２０とポケット３０は同数であると共に、何れも３の倍数でない偶数個形成されており、柱部２０はそれぞれのポケット３０の周方向両側に設けられる。 (First embodiment)
FIG. 1 shows a bearing cage 1 of the present embodiment (hereinafter, simply referred to as a cage). The retainer 1 is a so-called crown-shaped retainer, and is an even-numbered (non-multiple of 3) projecting in the axial direction at a predetermined interval in the circumferential direction from the substantially annular base 10 and one axial side surface 12 of the base 10. 14 in the embodiment), a pair of adjacent pillars 20, 20, which are opposed to each other, 22 and 22, and one axial side surface 12 of the base 10, and is a rolling element (not shown) of the bearing. ) And an even number (14 in this embodiment) of pockets 30 that are not multiples of 3. That is, the number of the column parts 20 and the pockets 30 is the same, and an even number that is not a multiple of 3 is formed.

このような保持器１の製造方法では、三点ゲート方式の射出成形を採用している。具体的には、保持器１は、成形金型内に形成した環状のキャビティ（不図示）の外周側周縁部に設けた３個の樹脂射出ゲート（以下、単にゲートと呼ぶ。）５１から、補強繊維材を添加した溶解樹脂をキャビティ内に射出し、冷却固化することによって成形される。樹脂材料としては、例えば、４６ナイロンや６６ナイロンなどのポリアミド系樹脂、ポリブチレンテレフタレート、ポリフェニレンサルファイド（ＰＰＳ）、ポリエーテルエーテルケトン（ＰＥＥＫ）、ポリエーテルニトリル（ＰＥＮ）等の樹脂に、１０〜５０ｗｔ％の補強繊維材（例えば、ガラス繊維や炭素繊維。）を添加した樹脂組成物が用いられる。なお、図１中、キャビティは不図示であるが、その内部構造は保持器１の構造と略同一とされている。   In such a manufacturing method of the cage 1, a three-point gate type injection molding is adopted. Specifically, the cage 1 includes three resin injection gates (hereinafter simply referred to as gates) 51 provided on the outer peripheral side peripheral portion of an annular cavity (not shown) formed in the molding die. The molten resin to which the reinforcing fiber material is added is injected into the cavity and molded by cooling and solidifying. Examples of resin materials include polyamide resins such as 46 nylon and 66 nylon, resins such as polybutylene terephthalate, polyphenylene sulfide (PPS), polyether ether ketone (PEEK), and polyether nitrile (PEN). % Of a reinforcing fiber material (for example, glass fiber or carbon fiber) is used. In FIG. 1, the cavity is not shown, but its internal structure is substantially the same as the structure of the cage 1.

各ゲート５１には、それぞれ径方向に延びる略円筒状のランナー５３を介して、略円筒状のスプルー５５から溶解樹脂が供給される。スプルー５５は、保持器１（キャビティ）の略中心において軸方向に延びており、ランナー５３と接続される。したがって、スプルー５５から供給された溶解樹脂は、各ランナー５３を介して各ゲート５１に到達し、各ゲート５１から同時にキャビティ内に流入する。   Dissolved resin is supplied to each gate 51 from a substantially cylindrical sprue 55 via a substantially cylindrical runner 53 extending in the radial direction. The sprue 55 extends in the axial direction at the approximate center of the cage 1 (cavity) and is connected to the runner 53. Therefore, the molten resin supplied from the sprue 55 reaches each gate 51 via each runner 53 and flows into the cavity from each gate 51 simultaneously.

隣り合うゲート５１の間の領域を第１〜第３領域Ｓ１〜Ｓ３とする。ここで、第１及び第２領域Ｓ１、Ｓ２におけるポケット３０の数は、互いに等しく、且つ、奇数個であり、本実施形態では５個である。また、第３領域Ｓ３におけるポケット３０の数は、偶数個であり、且つ、第１及び第２領域Ｓ１、Ｓ２のポケットの数より１個多く又は１個少なく設定される。本実施形態における第３領域Ｓ３におけるポケット３０の数は、第１及び第２領域Ｓ１、Ｓ２のポケット３０の数より１個少なく設定されており、４個である。   Regions between adjacent gates 51 are defined as first to third regions S1 to S3. Here, the number of pockets 30 in the first and second regions S1 and S2 is equal to each other and is an odd number, and is five in the present embodiment. The number of pockets 30 in the third region S3 is an even number, and is set to be one more or one less than the number of pockets in the first and second regions S1 and S2. In the present embodiment, the number of pockets 30 in the third region S3 is set to be one less than the number of pockets 30 in the first and second regions S1 and S2, and is four.

また、３個のゲート５１は、それぞれ柱部２０の周方向中央からずれた位置に連通するように設けられている。より具体的に、第１及び第２領域Ｓ１、Ｓ２を分けるゲート５１は、柱部２０の周方向中央から第１領域Ｓ１側にずれた位置に設けられる。第２及び第３領域Ｓ２、Ｓ３を分けるゲート５１は、柱部２０の周方向中央から第３領域Ｓ３側にずれた位置に設けられる。第３及び第１領域Ｓ３、Ｓ１を分けるゲート５１は、柱部２０の周方向中央から第１領域側Ｓ１にずれた位置に設けられる。   The three gates 51 are provided so as to communicate with positions shifted from the center in the circumferential direction of the column part 20. More specifically, the gate 51 that divides the first and second regions S1 and S2 is provided at a position shifted from the circumferential center of the column portion 20 toward the first region S1. The gate 51 that divides the second and third regions S2 and S3 is provided at a position shifted from the circumferential center of the column portion 20 toward the third region S3. The gate 51 that separates the third and first regions S3 and S1 is provided at a position shifted from the circumferential center of the column portion 20 to the first region side S1.

第１〜第３領域Ｓ１〜Ｓ３の柱部２０には、それぞれ溶解樹脂を貯留可能な樹脂溜り４０が設けられる。第１及び第２領域Ｓ１、Ｓ２における樹脂溜り４０は、第１及び第２領域Ｓ１、Ｓ２のそれぞれ周方向中央に位置するポケット３０（３番目のポケット３０）に隣り合う一対の柱部２０のうち、一方の柱部２０の周方向中央に設けられる。本実施形態において、第１領域Ｓ１における樹脂溜り４０は、周方向中央に位置するポケット３０の反時計回り側の柱部２０に設けられており、第２領域Ｓ２における樹脂溜り４０は、周方向中央に位置するポケット３０の時計回り側の柱部２０に設けられている。なお、第１領域Ｓ１における樹脂溜り４０を、周方向中央に位置するポケット３０の時計回り側の柱部２０に設け、第２領域Ｓ２における樹脂溜り４０を、周方向中央に位置するポケット３０の反時計回り側の柱部２０に設けてもよい。また、第３領域Ｓ３における樹脂溜り４０は、第３領域Ｓ３の周方向中央に位置する柱部２０（２及び３番目のポケット３０の間の柱部２０）の周方向中央に設けられる。なお、本実施形態における樹脂溜り４０は、柱部２０の周方向中央の外周面に連通している。   Resin reservoirs 40 capable of storing dissolved resin are provided in the column portions 20 of the first to third regions S1 to S3. The resin reservoirs 40 in the first and second regions S1 and S2 are formed by the pair of pillar portions 20 adjacent to the pockets 30 (third pockets 30) located in the circumferential center of the first and second regions S1 and S2, respectively. Of these, one column portion 20 is provided at the center in the circumferential direction. In the present embodiment, the resin reservoir 40 in the first region S1 is provided on the column portion 20 on the counterclockwise side of the pocket 30 located in the center in the circumferential direction, and the resin reservoir 40 in the second region S2 is in the circumferential direction. It is provided on the pillar 20 on the clockwise side of the pocket 30 located in the center. The resin reservoir 40 in the first region S1 is provided on the pillar 20 on the clockwise side of the pocket 30 located in the center in the circumferential direction, and the resin reservoir 40 in the second region S2 is provided in the pocket 30 located in the center in the circumferential direction. You may provide in the pillar part 20 of the counterclockwise side. In addition, the resin reservoir 40 in the third region S3 is provided at the center in the circumferential direction of the column portion 20 (the column portion 20 between the second and third pockets 30) located at the center in the circumferential direction of the third region S3. The resin reservoir 40 in the present embodiment communicates with the outer peripheral surface at the center in the circumferential direction of the column part 20.

このような構成において、ゲート５１からキャビティ内に射出され隣り合うゲート５１の間の第１〜第３領域Ｓ１〜Ｓ３の両端から最も離れたポケット３０で合流し、ウェルドＷが形成される。第１及び第２領域Ｓ１、Ｓ２におけるウェルドＷは、ポケット３０の周方向中央部近傍に形成され、第３領域Ｓ３におけるウェルドＷは、ポケット３０の周方向中央から第２領域Ｓ２側にずれた位置に形成される。ここで、ウェルドＷが形成されるポケット３０に隣り合う柱部２０には樹脂溜り４０が設けられるので、ウェルドＷ形成位置と樹脂溜り４０配置位置とが周方向にずれ、ウェルドＷと樹脂溜り４０との間に溶解樹脂の圧力勾配を生じ易くなる。したがって、当該圧力勾配に起因する強制的な樹脂の流動が起きることで、ウェルドＷにおいて補強繊維材が溶解樹脂の流動方向に対し垂直に配向することを抑制することができる。特に、上記のように、ウェルドＷがポケット３０に形成され、樹脂溜り４０が当該ポケット３０に隣り合う柱部２０の周方向中央に配置されているので、ウェルドＷから樹脂溜り４０に向かって流路断面積が拡大する方向に溶解樹脂の強制的な流動が発生する。したがって、ウェルドＷにおける繊維配向の乱れた領域が、断面積の広い部分に移動するため、ウェルドＷ強度をより向上させる効果を有する。以上のように、ウェルドＷの補強繊維材の配向が制御され、ウェルドＷ強度が向上し、ひいては保持器１の強度低下を抑制できる。   In such a configuration, the welds W are formed by joining in the pockets 30 which are injected from the gate 51 into the cavity and are farthest from both ends of the first to third regions S1 to S3 between the adjacent gates 51. The weld W in the first and second regions S1 and S2 is formed near the center in the circumferential direction of the pocket 30, and the weld W in the third region S3 is shifted from the center in the circumferential direction of the pocket 30 toward the second region S2. Formed in position. Here, since the resin reservoir 40 is provided in the column portion 20 adjacent to the pocket 30 in which the weld W is formed, the weld W formation position and the resin reservoir 40 disposition position are shifted in the circumferential direction, and the weld W and the resin reservoir 40 are located. A pressure gradient of the dissolved resin is likely to occur between the two. Therefore, the forced flow of the resin due to the pressure gradient can prevent the reinforcing fiber material from being oriented perpendicular to the flow direction of the dissolved resin in the weld W. In particular, as described above, the weld W is formed in the pocket 30 and the resin reservoir 40 is disposed at the center in the circumferential direction of the column portion 20 adjacent to the pocket 30, so that the weld W flows from the weld W toward the resin reservoir 40. A forced flow of the dissolved resin occurs in the direction in which the road cross-sectional area increases. Therefore, since the region in which the fiber orientation is disturbed in the weld W moves to a portion having a large cross-sectional area, it has an effect of further improving the weld W strength. As described above, the orientation of the reinforcing fiber material of the weld W is controlled, the weld W strength is improved, and consequently the strength reduction of the cage 1 can be suppressed.

ここで、柱部２０と連通し、キャビティへの開口部である樹脂溜り４０の連通部４２の断面積は、ゲート５１の断面積の１／４以下に設定される。これによれば、溶解樹脂が合流してウェルドＷが形成された後で樹脂溜り４０への溶解樹脂の流入が始まるので、ウェルドＷにおける強制的な樹脂の流動によって補強繊維材の配向を制御する効果をより確実に発現することができる。   Here, the cross-sectional area of the communication portion 42 of the resin reservoir 40 that communicates with the column portion 20 and is an opening to the cavity is set to ¼ or less of the cross-sectional area of the gate 51. According to this, since the melted resin merges and the weld W is formed after the weld W is formed, the orientation of the reinforcing fiber material is controlled by the forced resin flow in the weld W. An effect can be expressed more reliably.

（第２実施形態）
次に、本発明に係る第２実施形態の軸受用保持器の製造方法について図面を参照して説明する。 (Second Embodiment)
Next, the manufacturing method of the bearing retainer according to the second embodiment of the present invention will be described with reference to the drawings.

図２に示すように、本実施形態では、柱部２０の内周面に樹脂溜り４０が設けられる点で、上記実施形態と相違する。その他の構成は、上記実施形態と同様であり、上記実施形態と同様の効果を奏することが可能である。   As shown in FIG. 2, the present embodiment is different from the above-described embodiment in that a resin reservoir 40 is provided on the inner peripheral surface of the column portion 20. Other configurations are the same as those in the above embodiment, and the same effects as those in the above embodiment can be obtained.

（実施例）
次に、樹脂溜り４０の連通部４２の断面積と、樹脂射出ゲート５１の断面積と、の関係についての解析結果について述べる。 (Example)
Next, the analysis result about the relationship between the cross-sectional area of the communication part 42 of the resin reservoir 40 and the cross-sectional area of the resin injection gate 51 will be described.

図３〜６及び表１に示すように実施例１及び比較例１〜３において、キャビティ６０を簡単な単純円環モデルとし、樹脂射出ゲート５１の径（断面積）を一定とし、樹脂溜り４０の連通部４２の径（断面積）を変化させたときの、溶解樹脂Ｇが流動する様子を、東レエンジニアリング（株）製の樹脂流動解析ソフトウェア「３Ｄ ＴＩＭＯＮ」にて解析した。   As shown in FIGS. 3 to 6 and Table 1, in Example 1 and Comparative Examples 1 to 3, the cavity 60 is a simple simple ring model, the diameter (cross-sectional area) of the resin injection gate 51 is constant, and the resin reservoir 40 The state in which the dissolved resin G flows when the diameter (cross-sectional area) of the communication portion 42 of the resin was changed was analyzed by a resin flow analysis software “3D TIMON” manufactured by Toray Engineering Co., Ltd.

Figure 2016114102
Figure 2016114102

図４〜６の比較例１〜３に示すように、樹脂射出ゲート５１の断面積に対する連通部４２の断面積の比率が０．４４〜１．００のときは、溶解樹脂Ｇ同士が合流する前に樹脂溜り４０への溶解樹脂Ｇの流入が始まる。これらの場合、溶解樹脂Ｇが合流した後でウェルドＷに強制的な樹脂の流動を起こす効果が小さく、ウェルドＷにおける補強繊維材の配向を制御する効果が発現しにくい。   As shown in Comparative Examples 1 to 3 in FIGS. 4 to 6, when the ratio of the cross-sectional area of the communication portion 42 to the cross-sectional area of the resin injection gate 51 is 0.44 to 1.00, the dissolved resins G merge. Before, the inflow of the dissolved resin G into the resin reservoir 40 starts. In these cases, the effect of forcibly causing the resin to flow in the weld W after the molten resin G merges is small, and the effect of controlling the orientation of the reinforcing fiber material in the weld W is difficult to be exhibited.

一方、図３の実施例１に示すように、樹脂射出ゲート５１の断面積に対する連通部４２の断面積の比率が０．２５のときは、溶解樹脂Ｇが合流する前には、樹脂溜り４０に溶解樹脂Ｇが流入しない。このため、溶解樹脂Ｇが合流してウェルドＷが形成された後で、ウェルドＷに強制的な樹脂の流動を起こす効果が大きく、ウェルドＷにおける補強繊維材の配向を制御する効果を発現する。   On the other hand, when the ratio of the cross-sectional area of the communication portion 42 to the cross-sectional area of the resin injection gate 51 is 0.25, as shown in the first embodiment of FIG. The dissolved resin G does not flow into. For this reason, after melt | dissolution resin G merges and the weld W is formed, the effect which raise | generates forced resin flow to the weld W is large, and the effect which controls the orientation of the reinforcing fiber material in the weld W is expressed.

このように、樹脂溜り４０の連通部４２の断面積が、樹脂射出ゲート５１の断面積の１／４以下である場合、溶解樹脂Ｇが合流する前には樹脂溜り４０に溶解樹脂Ｇが流入せず、ウェルドＷにおける補強繊維材の配向を制御する効果を発現することが明らかとなった。   Thus, when the cross-sectional area of the communication portion 42 of the resin reservoir 40 is ¼ or less of the cross-sectional area of the resin injection gate 51, the molten resin G flows into the resin reservoir 40 before the molten resin G merges. It became clear that the effect which controls the orientation of the reinforcing fiber material in the weld W was expressed.

尚、本発明は、前述した各実施形態に限定されるものではなく、適宜、変形、改良、等が可能である。   In addition, this invention is not limited to each embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.

このように、本発明の軸受用保持器の製造方法は、上記した冠形保持器１に限定されず、くし形保持器等、様々な種類の保持器に適用可能である。   Thus, the manufacturing method of the bearing cage of the present invention is not limited to the above-described crown-shaped cage 1 and can be applied to various types of cages such as a comb-shaped cage.

また、本発明の軸受用保持器は、強度低下が少なく耐久性に優れるため、転がり軸受に適用することが好適である。すなわち、このような転がり軸受は、内輪と、外輪と、内輪及び外輪との間に設けられた複数の転動体と、転動体をポケットに転動自在に保持し、耐久性に優れる軸受用保持器と、を備えるので、高速回転や高負荷等の要求を満たすことが可能である。   In addition, the bearing cage of the present invention is suitable for rolling bearings because it is less durable and excellent in durability. That is, such a rolling bearing has an inner ring, an outer ring, a plurality of rolling elements provided between the inner ring and the outer ring, and the rolling element is held in a pocket so that the rolling element can roll freely, and has excellent durability. Can satisfy the requirements such as high-speed rotation and high load.

１ 軸受用保持器
１０ 基部
１２ 軸方向一端側面
２０ 柱部
２２ 対向する面
３０ ポケット
４０ 樹脂溜り
４２ 連通部
５１ 樹脂射出ゲート
５３ ランナー
５５ スプルー
６０ キャビティ
Ｇ 溶解樹脂
Ｓ１〜Ｓ３ 領域
Ｗ ウェルド DESCRIPTION OF SYMBOLS 1 Bearing cage 10 Base 12 One axial side surface 20 Column 22 Opposite surface 30 Pocket 40 Resin reservoir 42 Communication part 51 Resin injection gate 53 Runner 55 Sprue 60 Cavity G Dissolved resin S1-S3 Area W Weld

Claims (1)

成形金型内に形成した略円環状のキャビティの周縁部に設けられた３個の樹脂射出ゲートから、溶解樹脂を前記キャビティ内に射出することによって成形される軸受用保持器の製造方法であって、
前記軸受用保持器は、
略円環状の基部と、
前記基部の軸方向一端側面から、周方向に所定の間隔で軸方向に突出する３の倍数でない偶数個の柱部と、
隣り合う一対の前記柱部の互いに対向する面と前記基部の軸方向一端側面とによって形成された、前記柱部と同数のポケットと、
を有し、
隣り合う前記樹脂射出ゲートの間の領域を、それぞれ第１〜第３領域とすると、
前記第１及び第２領域における前記ポケットの数は、互いに等しく、且つ、奇数個であり、
前記第３領域における前記ポケットの数は、偶数個であり、且つ、前記第１及び第２領域の前記ポケットの数より１個多く又は１個少なく、
前記第１及び第２領域を分ける前記樹脂射出ゲートは、前記柱部の周方向中央から前記第１領域側にずれた位置に設けられ、
前記第２及び第３領域を分ける前記樹脂射出ゲートは、前記柱部の周方向中央から前記第３領域側にずれた位置に設けられ、
前記第３及び第１領域を分ける前記樹脂射出ゲートは、前記柱部の周方向中央から前記第１領域側にずれた位置に設けられ、
前記第１〜第３領域の前記柱部には、それぞれ前記溶解樹脂を貯留可能な樹脂溜りが設けられ、
前記第１及び第２領域における前記樹脂溜りは、前記第１及び第２領域のそれぞれ周方向中央に位置する前記ポケットに隣り合う一対の前記柱部のうち、一方の前記柱部の周方向中央に設けられ、
前記第３領域における前記樹脂溜りは、前記第３領域の周方向中央に位置する前記柱部の周方向中央に設けられ、
前記柱部と連通する前記樹脂溜りの連通部の断面積は、前記樹脂射出ゲートの断面積の１／４以下である
ことを特徴とする軸受用保持器の製造方法。 A method of manufacturing a bearing retainer that is molded by injecting a molten resin into the cavity from three resin injection gates provided at the peripheral edge of a substantially annular cavity formed in a molding die. And
The bearing cage is
A substantially annular base;
An even number of pillar portions that are not a multiple of 3 projecting in the axial direction at predetermined intervals in the circumferential direction from the axial one end side surface of the base portion;
The same number of pockets as the pillars formed by the mutually opposing surfaces of a pair of adjacent pillars and the axial one end side surface of the base;
Have
When the regions between the resin injection gates adjacent to each other are first to third regions,
The number of the pockets in the first and second regions is equal to each other and an odd number;
The number of the pockets in the third region is an even number, and one more or one less than the number of the pockets in the first and second regions,
The resin injection gate that divides the first and second regions is provided at a position shifted from the circumferential center of the column portion toward the first region,
The resin injection gate that divides the second and third regions is provided at a position shifted from the circumferential center of the column portion toward the third region,
The resin injection gate that divides the third and first regions is provided at a position shifted from the circumferential center of the column portion toward the first region.
Each of the pillar portions of the first to third regions is provided with a resin reservoir capable of storing the dissolved resin,
The resin reservoir in the first and second regions is a circumferential center of one of the pair of column portions adjacent to the pockets located in the circumferential center of each of the first and second regions. Provided in
The resin reservoir in the third region is provided in the center in the circumferential direction of the column portion located in the center in the circumferential direction of the third region,
The bearing cage manufacturing method according to claim 1, wherein a cross-sectional area of the communication portion of the resin reservoir communicating with the column portion is ¼ or less of a cross-sectional area of the resin injection gate.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017048873A (en) * 2015-09-03 2017-03-09 日本精工株式会社 Manufacturing method of bearing cage
EP3257651A4 (en) * 2015-03-13 2018-05-23 NSK Ltd. Method of manufacturing bearing holder

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Publication number Priority date Publication date Assignee Title
JPS5988514U (en) * 1982-12-06 1984-06-15 日本精工株式会社 Cage for rolling bearings
JPH0929776A (en) * 1995-07-21 1997-02-04 Koyo Seiko Co Ltd Manufacture of synthetic resin retainer
JP2005083406A (en) * 2003-09-04 2005-03-31 Nsk Ltd Retainer and its manufacturing method
JP2012219917A (en) * 2011-04-08 2012-11-12 Nsk Ltd Resin member, bearing retainer, and method for manufacturing the same
JP2012236363A (en) * 2011-05-12 2012-12-06 Nsk Ltd Resin-made cage for bearing and method of manufacturing the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5988514U (en) * 1982-12-06 1984-06-15 日本精工株式会社 Cage for rolling bearings
JPH0929776A (en) * 1995-07-21 1997-02-04 Koyo Seiko Co Ltd Manufacture of synthetic resin retainer
JP2005083406A (en) * 2003-09-04 2005-03-31 Nsk Ltd Retainer and its manufacturing method
JP2012219917A (en) * 2011-04-08 2012-11-12 Nsk Ltd Resin member, bearing retainer, and method for manufacturing the same
JP2012236363A (en) * 2011-05-12 2012-12-06 Nsk Ltd Resin-made cage for bearing and method of manufacturing the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3257651A4 (en) * 2015-03-13 2018-05-23 NSK Ltd. Method of manufacturing bearing holder
JP2017048873A (en) * 2015-09-03 2017-03-09 日本精工株式会社 Manufacturing method of bearing cage

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