JP2016080050A - Resin holder for bearing and manufacturing method thereof - Google Patents

Resin holder for bearing and manufacturing method thereof Download PDF

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JP2016080050A
JP2016080050A JP2014211143A JP2014211143A JP2016080050A JP 2016080050 A JP2016080050 A JP 2016080050A JP 2014211143 A JP2014211143 A JP 2014211143A JP 2014211143 A JP2014211143 A JP 2014211143A JP 2016080050 A JP2016080050 A JP 2016080050A
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resin
cavity
bearing
peripheral side
cage
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優介 松屋
yusuke Matsuya
優介 松屋
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NSK Ltd
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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
    • 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 provide a resin holder for a bearing molded by ejecting molten resin from a resin ejection gate into a cavity, capable of suppressing strength deterioration with a simple structure, and a manufacturing method of the resin holder.SOLUTION: A resin holder for a bearing is molded by ejecting molten resin into a substantially annular cavity 10 from one resin ejection gate 20 provided at an outer peripheral side peripheral edge part 11 or inner peripheral side peripheral edge part 13 of the cavity 10 formed in a molding die 9. In the resin holder for a bearing, a weld W is inclined to a radial direction.SELECTED DRAWING: Figure 1

Description

本発明は、軸受用樹脂製保持器、及びその製造方法に関する。   The present invention relates to a resin cage for a bearing and a method for manufacturing the same.

特許文献１に記載されているように、一般的に、軸受用樹脂製保持器は射出成形により製造される。具体的には、図５に示すように、成形金型１００内に成形体である軸受用樹脂製保持器に対応する環状のキャビティ１１０を形成し、このキャビティ１１０の外周側周縁部１１１に設けた樹脂射出ゲート１２０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。   As described in Patent Document 1, a bearing-made resin cage is generally manufactured by injection molding. Specifically, as shown in FIG. 5, an annular cavity 110 corresponding to a bearing resin cage, which is a molded body, is formed in a molding die 100, and provided on the outer peripheral edge 111 of the cavity 110. It is manufactured by injecting a melted resin material (thermoplastic resin) from the resin injection gate 120 and solidifying by cooling.

キャビティ１１０に注入された溶解樹脂は、キャビティ１１０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１２０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 110 flows into the cavity 110 as two flows on both sides in the circumferential direction, and merges again at a position opposite to the resin injection gate 120 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、ポケットにおいて軸方向肉厚が最も薄いポケット底や、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。   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 axial thickness is the thinnest in the pocket, or at the corner R portion where the annular portion and the pillar portion intersect), Damage is likely to occur, and the durability of the cage is impaired.

そこで、特許文献１の発明では、キャビティ１１０の内周側縁部１１３のうち、ウェルド１００Ｗの位置に一致する位置に第１樹脂溜り１３０が設けられ、第１樹脂溜り１３０に近接する位置に第２樹脂溜り１４０が設けられている。したがって、樹脂射出ゲート１２０からキャビティ１１０内に注入された溶解樹脂は、第１樹脂溜り１３０に流れ込み、それに伴って補強繊維材も内周側に向かって狭くなるハ字状に配向し、ウェルド１００Ｗの増強効果が高まる。また、第２樹脂溜り１４０により、溶解樹脂が更に流動し、ウェルド１００Ｗ及びその近傍における増強効果が高まる。   Therefore, in the invention of Patent Document 1, the first resin reservoir 130 is provided at a position corresponding to the position of the weld 100W in the inner peripheral side edge portion 113 of the cavity 110, and the first resin reservoir 130 is disposed at a position close to the first resin reservoir 130. Two resin reservoirs 140 are provided. Therefore, the melted resin injected into the cavity 110 from the resin injection gate 120 flows into the first resin reservoir 130, and the reinforcing fiber material is accordingly oriented in a letter C shape that becomes narrower toward the inner peripheral side. The enhancement effect of increases. Further, the second resin reservoir 140 causes the dissolved resin to further flow, and the enhancement effect in the weld 100W and the vicinity thereof is enhanced.

特開２０１２−９２８６２号公報JP 2012-92862 A

しかしながら、特許文献１の製造方法では、金型成形完了後に第１及び第２樹脂溜り１３０、１４０を切り離す後工程が必要であるため、時間的にもコスト的には無駄が発生するという問題があった。   However, the manufacturing method disclosed in Patent Document 1 requires a post-process for separating the first and second resin reservoirs 130 and 140 after the completion of the mold forming, and therefore there is a problem that waste occurs in terms of time and cost. there were.

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、簡易な構成でありながら、強度低下を抑制可能な軸受用樹脂製保持器、及びそ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 resin-made cage for bearings which can suppress an intensity | strength fall, and its manufacturing method, although it is a simple structure. .

本発明の上記目的は、下記の構成により達成される。
（１） 軸受用樹脂製保持器であって、
ウェルドが径方向に対して傾いていることを特徴とする軸受用樹脂製保持器。
（２） 成形金型内に形成した略円環状のキャビティの外周側周縁部又は内周側周縁部に設けられた一つ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樹脂製保持器の製造方法であって、
前記樹脂射出ゲートと、前記樹脂射出ゲートと径方向に対向する位置と、を結んだ仮想線で前記キャビティを第１及び第２領域に分けたとき、
前記第１領域において、前記キャビティの外周側周縁部には少なくとも一つの凸部が形成され、
前記第２領域において、前記キャビティの内周側周縁部には少なくとも一つの凸部が形成される
ことを特徴とする軸受用樹脂製保持器の製造方法。
（３） （２）に記載の軸受用樹脂製保持器の製造方法によって製造されたことを特徴とする軸受用樹脂製保持器。 The above object of the present invention can be achieved by the following constitution.
(1) A resin cage for bearings,
A resin cage for a bearing, wherein the weld is inclined with respect to the radial direction.
(2) Molded by injecting dissolved resin into the cavity from one resin injection gate provided at the outer peripheral side peripheral edge or inner peripheral side peripheral edge of the substantially annular cavity formed in the molding die. A method of manufacturing a resin cage for a bearing, comprising:
When the cavity is divided into first and second regions by a virtual line connecting the resin injection gate and a position facing the resin injection gate in the radial direction,
In the first region, at least one convex portion is formed on the outer peripheral side peripheral portion of the cavity,
In the second region, at least one convex portion is formed on the inner peripheral side peripheral portion of the cavity.
(3) A resin cage for bearings produced by the method for producing a resin cage for bearings according to (2).

本発明の軸受用樹脂製保持器、及びその製造方法によれば、溶解樹脂が合流することによって形成されたウェルドは、径方向に対して傾いている。すなわち、ウェルドが溶解樹脂の流動方向（円周方向）に一致する方向に傾くので、補強繊維材による補強効果が発現しやすくなり、ウェルドの強度を増すことが可能となる。したがって、軸受用樹脂製保持器の強度低下を抑制することができる。   According to the bearing resin cage and the manufacturing method thereof of the present invention, the weld formed by the joining of the dissolved resin is inclined with respect to the radial direction. That is, since the weld is inclined in a direction coinciding with the flowing direction (circumferential direction) of the dissolved resin, the reinforcing effect by the reinforcing fiber material is easily exhibited, and the strength of the weld can be increased. Therefore, the strength reduction of the bearing resin cage can be suppressed.

第１実施形態に係る軸受用樹脂製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 resin-made cage for bearings concerning 1st Embodiment. 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斜視図である。It is a perspective view of the crown-shaped cage manufactured by the manufacturing method concerning an embodiment. 第２実施形態に係る軸受用樹脂製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 resin-made cage for bearings concerning 2nd Embodiment. 第３実施形態に係る軸受用樹脂製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 resin cage for bearings concerning 3rd Embodiment. 従来の軸受用樹脂製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 resin cage for bearings.

以下、本発明に係る軸受用樹脂製保持器、及びそ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 resin cage for bearings and the manufacturing method thereof according to the present invention will be described in detail with reference to the drawings.

（第１実施形態）
本発明の第１実施形態に係る軸受用樹脂製保持器の製造方法では、一点ゲート方式の射出成形を採用している。具体的には、図１に示すように、本発明に係る軸受用樹脂製保持器は、成形金型９内に形成した環状のキャビティ１０の外周側周縁部１１に設けた１つの樹脂射出ゲート（以下、単にゲートと呼ぶ。）２０から、強化繊維を添加した溶解樹脂をキャビティ１０内に射出し、冷却固化することによって成形される。なお、ゲート２０はキャビティ１０の内周側周縁部１３に設けても構わない。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、ポリフェレンサルサイド（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％の強化繊維（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、軸受用樹脂製保持器の構造に相当する部分は、簡単のために省略している。 (First embodiment)
In the manufacturing method of the resin cage for bearings according to the first embodiment of the present invention, single-point gate type injection molding is adopted. Specifically, as shown in FIG. 1, the bearing resin cage according to the present invention is a single resin injection gate provided at the outer peripheral edge 11 of an annular cavity 10 formed in a molding die 9. (Hereinafter, it is simply referred to as a gate.) From 20, a molten resin to which reinforcing fibers have been added is injected into the cavity 10 and molded by cooling and solidifying. Note that the gate 20 may be provided on the inner peripheral edge 13 of the cavity 10. Examples of the resin material include polyamide resins such as 46 nylon and 66 nylon, polybutylene terephthalate, polyferlen salside (PPS), polyether ether ketone (PEEK), polyether nitrile (PEN), and the like. A resin composition to which 50 wt% reinforcing fiber (for example, glass fiber or carbon fiber) is added is used. In FIG. 1, portions corresponding to the structure of the bearing resin cage are omitted for simplicity.

ゲート２０と、ゲート２０と径方向に対向する反対側の位置Ｐと、を結んだ仮想線Ｍでキャビティ１０を第１及び第２領域Ｓ１、Ｓ２に分ける。このとき、第１領域Ｓ１において、キャビティ１０の外周側周縁部１１には、内周側に延びる複数の外周側凸部１２が形成される。第２領域Ｓ２において、キャビティ１０の内周側周縁部１３には、外周側に延びる複数の内周側凸部１４が形成される。   The cavity 10 is divided into first and second regions S1 and S2 by an imaginary line M connecting the gate 20 and the position P opposite to the gate 20 in the radial direction. At this time, in the first region S <b> 1, a plurality of outer peripheral convex portions 12 extending to the inner peripheral side are formed on the outer peripheral side peripheral portion 11 of the cavity 10. In the second region S2, a plurality of inner peripheral convex portions 14 extending to the outer peripheral side are formed on the inner peripheral peripheral edge 13 of the cavity 10.

図示の例では、断面略矩形状の外周側凸部１２及び内周側凸部１４が、ゲート２０と、ゲート２０と径方向に対向する位置Ｐと、の周方向における略中央部に、等間隔で９個形成されている。これらの外周側凸部１２及び内周側凸部１４は、仮想線Ｍに関して略線対称に形成されている。しかし、外周側凸部１２及び内周側凸部１４は、上記の構成に限られるものではなく、第１及び第２領域Ｓ１、Ｓ２にそれぞれ少なくとも一つの外周側凸部１２及び内周側凸部１４が形成されれば、その形状、数、位置等は適宜変更して構わない。   In the example shown in the drawing, the outer peripheral side convex portion 12 and the inner peripheral side convex portion 14 having a substantially rectangular cross section are formed at a substantially central portion in the circumferential direction between the gate 20 and the position P facing the gate 20 in the radial direction, Nine are formed at intervals. The outer peripheral convex portion 12 and the inner peripheral convex portion 14 are formed substantially symmetrical with respect to the virtual line M. However, the outer peripheral convex portion 12 and the inner peripheral convex portion 14 are not limited to the above configuration, and at least one outer peripheral convex portion 12 and an inner peripheral convex portion are provided in the first and second regions S1 and S2, respectively. If the portion 14 is formed, its shape, number, position, and the like may be changed as appropriate.

ここで、ゲート２０からキャビティ１０内に注入された溶解樹脂は、キャビティ１０内を左右に二つの流れとなって流動する。仮にキャビティ１０に外周側凸部１２及び内周側凸部１４を設けない場合は、ゲート２０と径方向に対向する位置Ｐにおいて、仮想線Ｍに平行なウェルド部が形成される。   Here, the molten resin injected from the gate 20 into the cavity 10 flows in two directions on the left and right in the cavity 10. If the outer peripheral side convex part 12 and the inner peripheral side convex part 14 are not provided in the cavity 10, a weld part parallel to the virtual line M is formed at a position P facing the gate 20 in the radial direction.

しかしながら、本実施形態では、外周側凸部１２によって、第１領域Ｓ１においては外周側において溶解樹脂の流動速度が遅くなり、内周側凸部１４によって、第２領域においては内周側において溶解樹脂の流動速度が遅くなる。これにより、溶解樹脂が合流することによって形成されたウェルドＷは、径方向に対して傾く。すなわち、ウェルドＷは、第１領域Ｓ１側に向かうにしたがって外周側に傾き、第２領域Ｓ２側に向かうにしたがって内周側に傾いた形状となる。すなわち、ウェルドＷが溶解樹脂の流動方向（円周方向）に一致する方向に傾くので、補強繊維材による補強効果が発現しやすくなり、ウェルドＷの強度を増すことが可能となる。したがって、軸受用樹脂製保持器の強度低下を抑制することができる。また、従来の特許文献１のように、キャビティに樹脂溜りを設ける必要がないので、樹脂溜りを除去する後工程も不要であり、構成を簡潔にできる。   However, in the present embodiment, the outer peripheral side convex portion 12 slows down the flow rate of the dissolved resin on the outer peripheral side in the first region S1, and the inner peripheral side convex portion 14 dissolves on the inner peripheral side in the second region. The flow rate of the resin becomes slow. Thereby, the weld W formed by the joining of the dissolved resin is inclined with respect to the radial direction. That is, the weld W has a shape that is inclined toward the outer peripheral side toward the first region S1 and inclined toward the inner peripheral side toward the second region S2. That is, since the weld W is inclined in a direction coinciding with the flow direction (circumferential direction) of the dissolved resin, the reinforcing effect by the reinforcing fiber material is easily exhibited, and the strength of the weld W can be increased. Therefore, the strength reduction of the bearing resin cage can be suppressed. Further, unlike the conventional patent document 1, since it is not necessary to provide a resin reservoir in the cavity, a post-process for removing the resin reservoir is not required, and the configuration can be simplified.

図２に、上述した第１実施形態の軸受用樹脂製保持器の製造方法によって製造された冠型保持器１を示す。冠型保持器１は、略円環状の基部３と、基部３の軸方向一端側面５から、周方向に所定の間隔で軸方向に突出する複数の柱部７と、を有しており、隣り合う一対の柱部７，７の互いに対向する面６，６と基部３の軸方向一端側面５とによって、軸受の転動体（不図示）を保持するポケット部８を形成している。   FIG. 2 shows the crown type cage 1 manufactured by the method for manufacturing the resin cage for bearings of the first embodiment described above. The crown-shaped cage 1 has a substantially annular base 3 and a plurality of pillars 7 protruding in the axial direction at predetermined intervals in the circumferential direction from the axial one end side surface 5 of the base 3. A pocket portion 8 that holds a rolling element (not shown) of the bearing is formed by the mutually facing surfaces 6 and 6 of the pair of adjacent column portions 7 and 7 and the axial one end side surface 5 of the base portion 3.

基部３の内周面には、キャビティ１０の内周側凸部１４に対応する内周側凹部２が形成される。基部３の外周面には、キャビティ１０の外周側凸部１２に対応する外周側凹部４が形成される。ここで、外周側凹部４にはグリースが溜まるので、遠心力によって摺動部にグリースが供給され、良好な潤滑に寄与する。   On the inner peripheral surface of the base portion 3, an inner peripheral concave portion 2 corresponding to the inner peripheral convex portion 14 of the cavity 10 is formed. On the outer peripheral surface of the base portion 3, an outer peripheral side concave portion 4 corresponding to the outer peripheral side convex portion 12 of the cavity 10 is formed. Here, since the grease is accumulated in the outer peripheral recess 4, the grease is supplied to the sliding portion by centrifugal force, which contributes to good lubrication.

尚、本発明は、前述した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 embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.

例えば、上述の実施形態において外周側凸部１２及び内周側凸部１４の形状は、断面略矩形状であったが、図３に示すような、曲面形状としても構わない。このような構成によれば、外周側凸部１２同士及び内周側凸部１４同士の間の谷の部分の強度を向上することが可能である。   For example, in the above-described embodiment, the outer peripheral convex portion 12 and the inner peripheral convex portion 14 have a substantially rectangular cross section, but may have a curved surface shape as shown in FIG. According to such a structure, it is possible to improve the intensity | strength of the part of the trough between outer peripheral side convex parts 12 and inner peripheral side convex parts 14. FIG.

また、外周側凸部１２及び内周側凸部１４の形状は、図４に示すように、断面略三角形状としてもよい。   Moreover, the outer peripheral side convex part 12 and the inner peripheral side convex part 14 are good also as a cross-sectional substantially triangular shape, as shown in FIG.

また、本発明の軸受用樹脂製保持器の製造方法が適用される軸受用樹脂製保持器の種類は限定されず、例えば、円筒ころ軸受用樹脂製保持器、アンギュラ玉軸受用樹脂製保持器等、様々な軸受用樹脂製保持器の製造に広く応用可能である。   Moreover, the kind of the resin cage for bearings to which the manufacturing method of the resin cage for bearings of the present invention is applied is not limited. For example, the resin cage for cylindrical roller bearings, the resin cage for angular ball bearings It can be widely applied to the production of various bearing resin cages.

また、本発明の軸受用樹脂製保持器は、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樹脂製保持器と、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。   Moreover, since the resin-made cage for bearings of the present invention is less durable and excellent in durability, it is preferably applied to a rolling bearing. That is, such a rolling bearing is a bearing resin that is excellent in durability by holding an inner ring, an outer ring, a plurality of rolling elements provided between the inner ring and the outer ring, and rolling elements in a pocket so that they can roll freely. And a cage made of steel, so that it is possible to satisfy requirements such as high-speed rotation and high load.

１ 冠形保持器（軸受用樹脂製保持器）
２ 内周側凹部
３ 基部
４ 外周側凹部
５ 軸方向一端側面
６ 面
７ 柱部
８ ポケット部
９ 成形金型
１０ キャビティ
１１ 外周側周縁部
１２ 外周側凸部
１３ 内周側周縁部
１４ 内周側凸部
２０ 樹脂射出ゲート
Ｍ 仮想線
Ｓ１ 第１領域
Ｓ２ 第２領域 1 Crowned cage (resin cage for bearings)
2 Inner peripheral side concave portion 3 Base 4 Outer peripheral side concave portion 5 One axial side surface 6 Surface 7 Column portion 8 Pocket portion 9 Mold 10 Cavity 11 Outer peripheral side peripheral portion 12 Outer peripheral side convex portion 13 Inner peripheral side peripheral portion 14 Inner peripheral side Protrusion 20 Resin injection gate M Virtual line S1 First region S2 Second region

Claims (3)

軸受用樹脂製保持器であって、
ウェルドが径方向に対して傾いていることを特徴とする軸受用樹脂製保持器。 A resin cage for bearings,
A resin cage for a bearing, wherein the weld is inclined with respect to the radial direction. 成形金型内に形成した略円環状のキャビティの外周側周縁部又は内周側周縁部に設けられた一つ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樹脂製保持器の製造方法であって、
前記樹脂射出ゲートと、前記樹脂射出ゲートと径方向に対向する位置と、を結んだ仮想線で前記キャビティを第１及び第２領域に分けたとき、
前記第１領域において、前記キャビティの外周側周縁部には少なくとも一つの凸部が形成され、
前記第２領域において、前記キャビティの内周側周縁部には少なくとも一つの凸部が形成される
ことを特徴とする軸受用樹脂製保持器の製造方法。 For bearings molded by injecting molten resin into the cavity from one outer peripheral edge or inner peripheral edge of the substantially annular cavity formed in the molding die A method of manufacturing a resin cage,
When the cavity is divided into first and second regions by a virtual line connecting the resin injection gate and a position facing the resin injection gate in the radial direction,
In the first region, at least one convex portion is formed on the outer peripheral side peripheral portion of the cavity,
In the second region, at least one convex portion is formed on the inner peripheral side peripheral portion of the cavity. 請求項２に記載の軸受用樹脂製保持器の製造方法によって製造されたことを特徴とする軸受用樹脂製保持器。   A bearing resin cage produced by the method for producing a bearing resin cage according to claim 2.
JP2014211143A 2014-10-15 2014-10-15 Resin holder for bearing and manufacturing method thereof Pending JP2016080050A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018202738A (en) * 2017-06-02 2018-12-27 株式会社ブリヂストン Injection mold, resin member, and method for producing resin product
CN110709228A (en) * 2017-06-02 2020-01-17 株式会社普利司通 Injection molding die, resin member, and method for producing resin product

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018202738A (en) * 2017-06-02 2018-12-27 株式会社ブリヂストン Injection mold, resin member, and method for producing resin product
CN110709228A (en) * 2017-06-02 2020-01-17 株式会社普利司通 Injection molding die, resin member, and method for producing resin product

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