JP2012236363A - Resin-made cage for bearing and method of manufacturing the same - Google Patents
Resin-made cage for bearing and method of manufacturing the same Download PDFInfo
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- JP2012236363A JP2012236363A JP2011107492A JP2011107492A JP2012236363A JP 2012236363 A JP2012236363 A JP 2012236363A JP 2011107492 A JP2011107492 A JP 2011107492A JP 2011107492 A JP2011107492 A JP 2011107492A JP 2012236363 A JP2012236363 A JP 2012236363A
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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
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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
- F16C33/46—Cages for rollers or needles
- F16C33/4617—Massive or moulded cages having cage pockets surrounding the rollers, e.g. machined window cages
- F16C33/4623—Massive or moulded cages having cage pockets surrounding the rollers, e.g. machined window cages formed as one-piece cages, i.e. monoblock cages
- F16C33/4635—Massive or moulded cages having cage pockets surrounding the rollers, e.g. machined window cages formed as one-piece cages, i.e. monoblock cages made from plastic, e.g. injection moulded window cages
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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
- 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
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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
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
- F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
- F16C19/36—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with a single row of rollers
- F16C19/364—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with a single row of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone
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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
- 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
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.
一般的に、軸受用樹脂製保持器は、通常、射出成形により製造される。具体的には、図１０に示すように、成形金型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を注入し、冷却固化することによって製造される。 Generally, a resin cage for bearings is usually manufactured by injection molding. Specifically, as shown in FIG. 10, an annular cavity 140 corresponding to a bearing resin cage, which 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. It is manufactured by injecting a resin material dissolved from, 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内を左右に二つの流れとなって流動し、樹脂射出ゲート１５０と対向する反対側の位置で再び合流し、相互に接合され、ウェルド部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、溶融樹脂の均一な混合が起こらず、ウェルド部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 in two directions to the left and right in the cavity 140, and merges again at the opposite position opposite the resin injection gate 150, and is joined to each other. It is formed. In general, since the resin-made cage for a bearing that is injection-molded in this way is a fusion resin that is simply fused and integrated, uniform mixing of the molten resin does not occur, and the strength is reduced in the weld portion 100W. It 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、金属繊維等の強化繊維を添加したものでは、ウェルド部１００Ｗにおいて強化繊維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、ウェルド部１００Ｗ以外の部分では、強化繊維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部との強度差が大きくなってしまう。 Further, in the case where a reinforcing fiber such as glass fiber, carbon fiber, or metal fiber is added as a reinforcing material to the molten resin, the reinforcing fiber is oriented perpendicularly to the flow direction of the molten resin in the weld portion 100W. Does not develop. Furthermore, in the portions other than the weld portion 100W, the reinforcing fibers are oriented in parallel to the flowing direction of the dissolved resin, so that a difference in strength between the portion and the weld portion 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部から破損することが多いため、以下に示すような対策がなされてきた。 Thus, since the resin-made cage for bearings manufactured by injection molding often breaks from the weak weld portion, the following countermeasures have been taken.
例えば、特許文献１記載の軸受用樹脂製保持器の製造方法においては、成形金型内に形成したキャビティに溶解樹脂を注入し、この溶解樹脂の合流箇所に、溶解樹脂が流入可能な樹脂溜まり部を設けている。このように構成することによって、合流箇所における強化繊維の配向を乱し、ウェルド部の強度を向上させることを図っている。 For example, in the method for manufacturing a resin cage for a bearing described in Patent Document 1, a molten resin is injected into a cavity formed in a molding die, and a resin pool into which the molten resin can flow into the merged portion of the molten resin. Is provided. By configuring in this way, the orientation of the reinforcing fibers at the confluence is disturbed, and the strength of the weld portion is improved.
また、特許文献２記載の射出成形方法では、ピストンを内蔵した樹脂溜まり部を溶解樹脂の分流流路の少なくとも一方に設け、ウェルド部形成後にピストンを前進または後退させることで、ウェルド部における溶解樹脂の移動を生じさせ、ウェルド部の強度向上を図っている。 In addition, in the injection molding method described in Patent Document 2, a resin reservoir having a built-in piston is provided in at least one of the split flow paths of the dissolved resin, and the piston is advanced or retracted after the weld is formed, whereby the molten resin in the weld is formed. The strength of the weld is improved.
また、特許文献３記載のプラスチックシールの射出成形方法では、射出された樹脂がキャビティ内を満たしウェルド部が形成された後、樹脂溜まり部に樹脂を流入させることにより、ウェルド部における強化繊維の配向を乱し、該ウェルド部の強度を改善することを図っている。 Further, in the plastic seal injection molding method described in Patent Document 3, after the injected resin fills the cavity and the weld portion is formed, the resin is caused to flow into the resin reservoir portion, whereby the orientation of the reinforcing fibers in the weld portion. The strength of the weld is improved.
しかしながら、特許文献１の軸受用樹脂製保持器の製造方法は、キャビティ内の溶解樹脂の合流箇所にのみ樹脂溜まり部を設けているため、ウェルド部の強化繊維の配向の変化が小さく、該ウェルド部の強度向上効果も小さいという欠点があった。さらに、ウェルド部の発生位置を制御することは困難であるため、十分な強度を必要とする部位にウェルド部が形成される場合があり、破損の原因となる虞があった。 However, since the method for manufacturing a resin cage for bearings in Patent Document 1 is provided with a resin reservoir only at the joining point of the molten resin in the cavity, the change in the orientation of the reinforcing fibers in the weld is small, and the weld There was a drawback that the effect of improving the strength of the part was small. Furthermore, since it is difficult to control the generation position of the weld portion, the weld portion may be formed in a portion requiring a sufficient strength, which may cause damage.
また、特許文献２の射出成形方法では、金型構造が複雑であり、金型の動作制御をしなければならなかった。 Moreover, in the injection molding method of Patent Document 2, the mold structure is complicated, and the operation of the mold must be controlled.
また、特許文献３のプラスチックシールの射出成形方法では、ウェルド部形成後に溶解樹脂を樹脂溜まり部に流入させている。したがって、ウェルド部の発生位置を制御することは困難であり、十分な強度を必要とする部位にウェルド部が形成された場合、仮に当該射出成形方法によってウェルド部の強度が改善されたとしても、ウェルド部以外の部位よりは強度が低いため、破損の原因となる虞がある。 Further, in the plastic seal injection molding method of Patent Document 3, the melted resin is caused to flow into the resin reservoir after the weld portion is formed. Therefore, it is difficult to control the occurrence position of the weld part, and if the weld part is formed in a site that requires sufficient strength, even if the strength of the weld part is improved by the injection molding method, Since the strength is lower than that of the portion other than the weld portion, it may cause damage.
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、軸受用樹脂製保持器の十分な強度を必要とする部分においてウェルド部の形成を抑制し、且つ、ウェルド部の強度を向上することが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。 The present invention has been made in view of the above-described problems, and an object of the present invention is to suppress the formation of a weld portion in a portion that requires a sufficient strength of a bearing resin cage, and the strength of the weld portion. It is providing the resin-made cage for bearings which can improve, and its manufacturing method.
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環状のキャビティの周縁部に設けられた少なくとも１つの樹脂射出ゲートから、強化繊維を添加した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、
前記キャビティの周縁部には、前記キャビティ内にウェルド部が形成される前に、前記溶解樹脂が流入する少なくとも１つの第１樹脂溜まり部と、前記キャビティ内に前記ウェルド部が形成された後に、前記溶解樹脂が流入する少なくとも１つの第２樹脂溜まり部と、が設けられ、
前記第１樹脂溜まり部は、該第１樹脂溜まり部を設けない場合に前記キャビティ内の前記ウェルド部が形成される位置ならびに前記樹脂射出ゲートと、周方向にラップしない位置において前記キャビティの周縁部に設けられる
ことを特徴とする軸受用樹脂製保持器の製造方法。
（２） １つの前記樹脂射出ゲートが、前記キャビティの周縁部に設けられ、
前記第１樹脂溜まり部は、該第１樹脂溜まり部と前記樹脂射出ゲートとの周方向距離が、前記キャビティの周縁部の周方向長さの１／２と等しくならないように、且つ前記樹脂射出ゲートと周方向にラップしないように、前記キャビティの周縁部に設けられる
ことを特徴とする（１）に記載の軸受用樹脂製保持器の製造方法。
（３） 複数の前記樹脂射出ゲートが、前記キャビティの周縁部に設けられ、
前記第１樹脂溜まり部は、周方向に隣り合う前記樹脂射出ゲートの周方向中間部ならびに前記樹脂射出ゲートと、周方向にラップしない位置において前記キャビティの周縁部に設けられる
ことを特徴とする（１）に記載の軸受用樹脂製保持器の製造方法。
（４） 前記第１樹脂溜まり部と前記キャビティの周縁部とは、第１連通部によって連通されており、
前記第２樹脂溜まり部と前記キャビティの周縁部とは、第２連通部によって連通されており、
前記第１連通部の断面積は、前記ウェルド部が形成される前に、前記第１樹脂溜まり部に前記溶解樹脂が流入可能であるように設定され、
前記第２連通部の断面積は、前記ウェルド部が形成された後に、前記第２樹脂溜まり部に前記溶解樹脂が流入可能であるように設定される
ことを特徴とする（１）〜（３）の１つに記載の軸受用樹脂製保持器の製造方法。
（５） （１）〜（４）の何れか１つ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 bearing resin formed by injecting a molten resin added with reinforcing fibers into the cavity from at least one resin injection gate provided at the peripheral edge of the annular cavity formed in the molding die. A method of manufacturing a cage made of
At the periphery of the cavity, before the weld part is formed in the cavity, at least one first resin reservoir part into which the dissolved resin flows, and after the weld part is formed in the cavity, And at least one second resin reservoir into which the dissolved resin flows, and
When the first resin reservoir is not provided, the first resin reservoir is located at a position where the weld is formed in the cavity and at a position where the resin injection gate does not wrap in the circumferential direction. A method for producing a resin-made cage for a bearing, characterized in that the method is provided.
(2) One of the resin injection gates is provided on the peripheral edge of the cavity,
The first resin reservoir portion is configured such that a circumferential distance between the first resin reservoir portion and the resin injection gate is not equal to ½ of a circumferential length of a peripheral edge portion of the cavity. (1) The method for manufacturing a resin-made cage for a bearing according to (1), wherein the cavity is provided at a peripheral portion of the cavity so as not to wrap in the circumferential direction with the gate.
(3) A plurality of the resin injection gates are provided at a peripheral edge of the cavity,
The first resin reservoir portion is provided in a peripheral portion of the cavity at a position where the first resin reservoir portion does not overlap with the circumferential direction intermediate portion and the resin injection gate of the resin injection gate adjacent in the circumferential direction ( The manufacturing method of the resin-made cage for bearings as described in 1).
(4) The first resin reservoir portion and the peripheral portion of the cavity are communicated with each other by a first communication portion,
The second resin reservoir and the peripheral edge of the cavity are communicated by a second communication part,
The cross-sectional area of the first communication portion is set so that the dissolved resin can flow into the first resin reservoir portion before the weld portion is formed,
The cross-sectional area of the second communication part is set so that the dissolved resin can flow into the second resin reservoir part after the weld part is formed. ). The manufacturing method of the resin-made cage for bearings described in one of the above.
(5) A resin cage for bearings manufactured by the method for manufacturing a resin cage for bearings according to any one of (1) to (4).
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、キャビティの周縁部には、キャビティ内にウェルド部が形成される前に溶解樹脂が流入する少なくとも１つの第１樹脂溜まり部が設けられ、第１樹脂溜まり部は、該第１樹脂溜まり部を設けない場合にキャビティ内のウェルド部が形成される位置ならびに前記樹脂射出ゲートと、周方向にラップしない位置においてキャビティの周縁部に設けられる。したがって、第１樹脂溜まり部を設ける位置を適切に設定することによって、ウェルド部の発生位置を制御することができ、軸受用樹脂製保持器の十分な強度を必要とする部分においてウェルド部の形成を抑制することが可能となる。
また、キャビティの周縁部には、ウェルド部が形成された後に、溶解樹脂が流入する少なくとも１つの第２樹脂溜まり部が設けられているので、ウェルド部における強化繊維の配向を乱すことができ、ウェルド部の強度を向上することが可能となる。
According to the bearing resin cage and the manufacturing method thereof of the present invention, at least one first resin reservoir portion into which the molten resin flows before the weld portion is formed in the cavity is formed on the peripheral portion of the cavity. The first resin reservoir portion is provided at a peripheral edge portion of the cavity at a position where the weld portion in the cavity is formed when the first resin reservoir portion is not provided, and at a position where the resin injection gate does not overlap with the resin injection gate. Provided. Therefore, by appropriately setting the position where the first resin reservoir portion is provided, the generation position of the weld portion can be controlled, and the weld portion is formed in a portion where sufficient strength of the bearing resin cage is required. Can be suppressed.
Moreover, since at least one second resin reservoir portion into which the dissolved resin flows after the weld portion is formed is provided at the peripheral portion of the cavity, the orientation of the reinforcing fibers in the weld portion can be disturbed, The strength of the weld portion can be improved.
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、三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３０内に形成した環状のキャビティ４０の外周側周縁部４２に設けた複数（本実施形態では３つ）の樹脂射出ゲート（以下、単にゲートと呼ぶ。）５０から、強化繊維を添加した溶解樹脂をキャビティ４０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, three-point gate type injection molding is adopted. Specifically, as shown in FIG. 1, the bearing resin cage according to the present invention includes a plurality of (this embodiment) provided on the outer peripheral side peripheral portion 42 of the annular cavity 40 formed in the molding die 30. Then, from three resin injection gates (hereinafter simply referred to as gates) 50, a molten resin to which reinforcing fibers are added is injected into the cavity 40, and is molded by cooling and solidifying. 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.
また、キャビティ４０の外周側周縁部４２及び内周側周縁部４４には、溶解樹脂が流入可能な複数（本実施形態では３つ）の第１，第２の樹脂溜まり部６０，７０が設けられている。ここで、第１の樹脂溜まり部６０の体積は、第２の樹脂溜まり部７０の体積よりも大きくなるように設定される。 The outer peripheral side peripheral portion 42 and the inner peripheral side peripheral portion 44 of the cavity 40 are provided with a plurality of (three in the present embodiment) first and second resin reservoir portions 60 and 70 through which dissolved resin can flow. It has been. Here, the volume of the first resin reservoir 60 is set to be larger than the volume of the second resin reservoir 70.
第１樹脂溜まり部６０は、周方向に隣り合うゲート５０の周方向中間部Ｗ´（図中、点線によって示されている。）ならびにゲート５０と周方向にラップしない位置において、周方向中間部Ｗ´よりも周方向一方側又は周方向他方側に僅かに変位した位置において、キャビティ４０の外周側周縁部４２又は内周側周縁部４４に設けられている。
なお、第１樹脂溜まり部６０は、必ずしもゲート５０の数と等しい数だけ設ける必要はなく、周方向に隣り合うゲート５０の周方向中間部Ｗ´ならびにゲート５０と周方向にラップしない位置において設けられる限り、任意の数に設定可能である。
The first resin reservoir 60 has a circumferential intermediate portion W ′ (indicated by a dotted line in the drawing) of the gate 50 adjacent in the circumferential direction and a position that does not wrap in the circumferential direction with the gate 50. It is provided on the outer peripheral side peripheral edge 42 or the inner peripheral peripheral edge 44 of the cavity 40 at a position slightly displaced in the circumferential direction one side or the circumferential direction other side than W ′.
The number of the first resin reservoirs 60 is not necessarily the same as the number of the gates 50, and is provided in the circumferential intermediate portion W ′ of the gates 50 adjacent in the circumferential direction and the positions where the gates 50 do not wrap in the circumferential direction. Any number can be set as long as possible.
第２樹脂溜まり部７０は、第１樹脂溜まり部６０と共に周方向中間部Ｗ´を周方向に挟むように、キャビティ４０の外周側周縁部４２又は内周側周縁部４４に設けられている。
なお、第２樹脂溜まり部７０は、必ずしもゲート５０の数と等しく設ける必要はなく、キャビティ４０の外周側周縁部４２又は内周側周縁部４４の任意の位置に、任意の数だけ設ければよい。
The second resin reservoir portion 70 is provided on the outer peripheral side peripheral portion 42 or the inner peripheral side peripheral portion 44 of the cavity 40 so as to sandwich the circumferential intermediate portion W ′ together with the first resin reservoir portion 60 in the circumferential direction.
Note that the number of the second resin reservoirs 70 is not necessarily equal to the number of the gates 50, and an arbitrary number of the second resin reservoirs 70 may be provided at any position of the outer peripheral side peripheral part 42 or the inner peripheral side peripheral part 44 of the cavity 40. Good.
また、それぞれの第１樹脂溜まり部６０とキャビティ４０の外周側周縁部４２又は内周側周縁部４４とは、第１連通部６２によって連通されており、それぞれの第２樹脂溜まり部７０とキャビティ４０の外周側周縁部４２又は内周側周縁部４４とは、第２連通部７２によって連通されている。 Further, the first resin reservoir 60 and the outer peripheral edge 42 or the inner peripheral edge 44 of the cavity 40 are communicated with each other by the first communication part 62, and the second resin reservoir 70 and the cavity are communicated with each other. The outer peripheral side peripheral portion 42 or the inner peripheral side peripheral portion 44 of the 40 is communicated by the second communication portion 72.
以下、図２〜４を参照し、キャビティ４０内に溶解樹脂Ｇを充填する様子を詳細に説明する。 Hereinafter, with reference to FIGS. 2 to 4, the manner in which the dissolved resin G is filled in the cavity 40 will be described in detail.
図２に示すように、３つのゲート５０からキャビティ４０内に注入された溶解樹脂Ｇは、それぞれキャビティ４０内を左右に二つの流れとなって流動する。ここで、仮にキャビティ４０に第１樹脂溜まり６０を設けない場合は、周方向に隣り合うゲート５０の周方向中間部Ｗ´にウェルド部が形成される。 As shown in FIG. 2, the molten resin G injected into the cavity 40 from the three gates 50 flows in the cavity 40 as two flows left and right. Here, if the first resin reservoir 60 is not provided in the cavity 40, a weld portion is formed in the circumferential intermediate portion W ′ of the gate 50 adjacent in the circumferential direction.
しかしながら、本実施形態では、周方向に隣り合うゲート５０間において、周方向中間部Ｗ´と周方向にラップしない位置で、第１樹脂溜まり部６０が設けられている。また、第１連通部６２の断面積は、ウェルド部Ｗが形成される前に、第１樹脂溜まり部６０に溶解樹脂Ｇが流入可能であるように設定されており、第２連通部７２の断面積は、ウェルド部Ｗが形成された後に、第２樹脂溜まり部６０に溶解樹脂Ｇが流入可能であるように設定されている。したがって、ウェルド部Ｗが形成される前に、すなわち、それぞれのゲート５０から注入され流動した溶解樹脂Ｇが互いに合流する前に、第１連通部６２を介して第１樹脂溜まり部６０に流入する。一方で、第２樹脂溜まり部７０には、溶解樹脂Ｇが流入しない。 However, in this embodiment, between the gates 50 adjacent in the circumferential direction, the first resin reservoir 60 is provided at a position that does not wrap in the circumferential direction intermediate portion W ′. The cross-sectional area of the first communication portion 62 is set so that the dissolved resin G can flow into the first resin reservoir 60 before the weld portion W is formed. The cross-sectional area is set so that the dissolved resin G can flow into the second resin reservoir 60 after the weld portion W is formed. Therefore, before the weld portion W is formed, that is, before the molten resins G injected and flown from the respective gates 50 merge with each other, they flow into the first resin reservoir 60 via the first communication portion 62. . On the other hand, the dissolved resin G does not flow into the second resin reservoir 70.
その後、溶解樹脂Ｇが注入され続け、図３に示すように、第１樹脂溜まり部６０とキャビティ４０とは、溶解樹脂Ｇによって満たされる。このように、キャビティ４０の外周側周縁部４２には、周方向中間部Ｗ´と周方向にラップしない位置において第１樹脂溜まり部６０が設けられているので、溶解樹脂Ｇが互いに合流する位置は周方向中間部Ｗ´よりも第１樹脂溜まり部６０寄りに変位し、当該合流位置にウェルド部Ｗ（図３中、一点鎖線によって示されている。）が形成されることになる。以上のように、第１樹脂溜まり部６０を設ける位置を、適切に設定することで、ウェルド部Ｗの発生位置を制御すること可能となる。
なお、第１樹脂溜まり部６０の体積は、ウェルド部Ｗの周方向中間部Ｗ´からの変位が十分となる程度に、溶解樹脂Ｇが流入可能な大きさに設定されることが望ましい。
Thereafter, the molten resin G is continuously injected, and the first resin reservoir 60 and the cavity 40 are filled with the molten resin G as shown in FIG. Thus, since the 1st resin reservoir part 60 is provided in the outer peripheral side peripheral part 42 of the cavity 40 in the position which does not lap | circulate with the circumferential direction intermediate part W ', the position where melted resin G merges mutually Is displaced closer to the first resin reservoir portion 60 than the intermediate portion W ′ in the circumferential direction, and a weld portion W (indicated by a one-dot chain line in FIG. 3) is formed at the joining position. As described above, it is possible to control the generation position of the weld portion W by appropriately setting the position where the first resin reservoir 60 is provided.
It is desirable that the volume of the first resin reservoir 60 be set to a size that allows the dissolved resin G to flow to such an extent that the displacement from the circumferential intermediate portion W ′ of the weld portion W is sufficient.
また、図３に示す場合では、ウェルド部Ｗは溶解樹脂Ｇが融着一体化しただけの強度が低い状態となっており、その後、図４に示すように、溶解樹脂Ｇが、第２連通部７２を介して第２樹脂溜まり部７０に流入することにより、ウェルド部Ｗにおける強化繊維の配向が乱され、ウェルド部Ｗの強度を向上させることができる。 Further, in the case shown in FIG. 3, the weld portion W is in a state of low strength that the melted resin G is fused and integrated, and thereafter, as shown in FIG. By flowing into the second resin reservoir 70 via the portion 72, the orientation of the reinforcing fibers in the weld portion W is disturbed, and the strength of the weld portion W can be improved.
（実施例１）
図５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９，９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１１を形成している。
なお、図５には、発明の理解のために、３点のゲート５０と、それぞれ３つの第１，第２樹脂溜まり部６０，７０と、第１，第２連通部６２，７２と、が模式的に図示されている。
Example 1
FIG. 5 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 11 that holds a rolling element (not shown) of the bearing is formed by the mutually opposing surfaces 9 and 9 of the pair of adjacent column portions 7 and 7 and the axial one end side surface 5 of the base portion 3.
In FIG. 5, for understanding of the invention, there are three gates 50, three first and second resin reservoirs 60 and 70, and first and second communication portions 62 and 72, respectively. It is schematically illustrated.
ここで、上述の軸受用樹脂製保持器の製造方法によれば、キャビティ４０の外周側周縁部４２又は内周側周縁部４４には、キャビティ４０内にウェルド部Ｗが形成される前に溶解樹脂Ｇが流入する複数の第１樹脂溜まり部６０が設けられ、第１樹脂溜まり部６０は、該第１樹脂溜まり部６０を設けない場合にキャビティ４０内のウェルド部が形成される位置Ｗ´（周方向に隣り合うゲート５０の周方向中間部）ならびにゲート５０と、周方向にラップしない位置においてキャビティ４０の外周側周縁部４２又は内周側周縁部４４に設けられる。したがって、複数の第１樹脂溜まり部６０を設ける位置を適切に設定することによって、ウェルド部Ｗの発生位置を柱部７内に制御することができ、冠型保持器１の十分な強度を必要とする部分（肉厚が薄いポケット部１１）におけるウェルド部Ｗの形成を抑制することが可能となる。 Here, according to the manufacturing method of the resin cage for bearings described above, the outer peripheral side peripheral portion 42 or the inner peripheral side peripheral portion 44 of the cavity 40 is dissolved before the weld portion W is formed in the cavity 40. A plurality of first resin reservoirs 60 into which the resin G flows are provided, and the first resin reservoirs 60 are positions W ′ where the welds in the cavities 40 are formed when the first resin reservoirs 60 are not provided. (A circumferential intermediate portion of the gate 50 adjacent in the circumferential direction) and the gate 50 are provided on the outer peripheral side peripheral portion 42 or the inner peripheral side peripheral portion 44 of the cavity 40 at a position not overlapping the peripheral direction. Therefore, by appropriately setting the positions at which the plurality of first resin reservoirs 60 are provided, the generation position of the weld portion W can be controlled in the column portion 7, and sufficient strength of the crown type cage 1 is required. It is possible to suppress the formation of the weld portion W in the portion (the pocket portion 11 having a small thickness).
また、キャビティ４０の外周側周縁部４２又は内周側周縁部４４には、ウェルド部Ｗが形成された後に、溶解樹脂Ｇが流入する複数の第２樹脂溜まり部７０が設けられているので、ウェルド部Ｗにおける強化繊維の配向が乱され、ウェルド部Ｗの強度を向上させることができる。 In addition, since the outer peripheral side peripheral portion 42 or the inner peripheral side peripheral portion 44 of the cavity 40 is provided with a plurality of second resin reservoir portions 70 into which the dissolved resin G flows after the weld portion W is formed. The orientation of the reinforcing fibers in the weld portion W is disturbed, and the strength of the weld portion W can be improved.
（実施例２）
また、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は、図６に示すような円すいころ軸受用保持器２０を製造する際に適用してもよい。なお、この円すいころ軸受用保持器２０は、３点ゲート方式で、且つキャビティ４０には、２つの第１樹脂溜まり部６０と、３つの第２樹脂溜まり部７０と、が設けられた軸受用樹脂製保持器の製造方法によって製造される。
(Example 2)
Moreover, you may apply the manufacturing method of the resin-made cage for bearings of 1st Embodiment mentioned above when manufacturing the tapered roller bearing cage 20 as shown in FIG. The tapered roller bearing retainer 20 is a three-point gate system, and the cavity 40 is provided with two first resin reservoirs 60 and three second resin reservoirs 70. It is manufactured by a method for manufacturing a resin cage.
円すいころ軸受用保持器２０は、円すい台形状を成しており、所定間隔を空けて対向する大径円環部２１及び小径円環部２２と、これらの円環部２１，２２を連結するとともに、当該円環部２１，２２間の空間領域を周方向に隔て、円すいころ（不図示）を保持するための複数のポケット部２３を形成する複数の柱部２４と、を備えている。 The tapered roller bearing retainer 20 has a conical trapezoidal shape, and connects the large-diameter annular portion 21 and the small-diameter annular portion 22 facing each other at a predetermined interval, and the annular portions 21 and 22. In addition, a plurality of pillar portions 24 are provided which form a plurality of pocket portions 23 for holding tapered rollers (not shown) with a space region between the annular portions 21 and 22 being circumferentially separated.
この円すいころ軸受用保持器２０においても、上述の軸受用樹脂製保持器の製造方法によれば、肉厚が薄いポケット部２３にウェルド部Ｗが発生しないように、ウェルド部Ｗの発生位置を柱部２４内に制御することが可能であるので、十分な強度を必要とする部分においてウェルド部Ｗの形成を抑制することが可能となる。
その他の効果は、実施例１と同様である。
Also in this tapered roller bearing retainer 20, according to the above-described method for producing a resin retainer for bearings, the generation position of the weld portion W is set so that the weld portion W does not occur in the pocket portion 23 having a small thickness. Since it can be controlled in the column part 24, it is possible to suppress the formation of the weld part W in a part that requires a sufficient strength.
Other effects are the same as those of the first embodiment.
（第２実施形態）
次に、本発明に係る第２実施形態の軸受用樹脂製保持器の製造方法について図面を参照して説明する。なお、第１実施形態と同一部分及び相当部分には、同一符号を付すことによって説明を省略する。
(Second Embodiment)
Next, the manufacturing method of the resin cage for bearings of 2nd Embodiment which concerns on this invention is demonstrated with reference to drawings. Note that the same parts as those in the first embodiment and corresponding parts are denoted by the same reference numerals, and description thereof is omitted.
図７に示すように、第２実施形態の軸受用樹脂製保持器の製造方法では、第１実施形態と異なり１点ゲート方式を採用しており、１つの樹脂射出ゲート５０がキャビティ４０の外周側周縁部４２に設けられている。 As shown in FIG. 7, the bearing resin manufacturing method of the second embodiment adopts a one-point gate method unlike the first embodiment, and one resin injection gate 50 is the outer periphery of the cavity 40. It is provided on the side peripheral edge 42.
また、キャビティ４０の外周側周縁部４２には、それぞれ１つずつ第１，第２樹脂溜まり部６０，７０が設けられている。 Further, first and second resin reservoir portions 60 and 70 are provided on the outer peripheral side peripheral portion 42 of the cavity 40, respectively.
第１樹脂溜まり部６０は、該第１樹脂溜まり部６０を設けない場合にキャビティ４０内のウェルド部Ｗが形成される位置Ｗ´ならびにゲート５０と、周方向にラップしない位置に、すなわち、第１樹脂溜まり部６０とゲート５０との周方向距離Ａが、キャビティ４０の周方向長さＢの１／２と等しくならず（Ａ≠Ｂ／２）、且つ０とならない（Ａ≠０）ように設けられている。
なお、第１樹脂溜まり部６０は、上記のようにＡ≠Ｂ／２且つＡ≠０の関係を満たす限り、複数設けてもよい。また、第２樹脂溜まり部７０は、キャビティ４０の外周側周縁部４２又は内周側周縁部４４の任意の位置に、任意の数だけ設ければよい。
When the first resin reservoir 60 is not provided, the first resin reservoir 60 is located at the position W ′ where the weld W in the cavity 40 is formed and the gate 50 so as not to wrap in the circumferential direction. 1 The circumferential distance A between the resin reservoir 60 and the gate 50 is not equal to 1/2 of the circumferential length B of the cavity 40 (A ≠ B / 2) and does not become 0 (A ≠ 0). Is provided.
A plurality of first resin reservoirs 60 may be provided as long as the relationship of A ≠ B / 2 and A ≠ 0 is satisfied as described above. Further, the second resin reservoir 70 may be provided in an arbitrary number at any position of the outer peripheral side peripheral edge 42 or the inner peripheral peripheral edge 44 of the cavity 40.
（実施例３）
図８に、上述した第２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。この冠型保持器１においても、第１樹脂溜まり部６０を設けたことによって、ウェルド部Ｗの発生位置が制御され、冠型保持器１の十分な強度を必要とする部分（肉厚が薄いポケット部１１）におけるウェルド部Ｗの形成が抑制される。また、キャビティ４０の外周側周縁部４２には、ウェルド部Ｗが形成された後に、溶解樹脂Ｇが流入する複数の第２樹脂溜まり部７０が設けられているので、ウェルド部Ｗにおける強化繊維の配向が乱され、ウェルド部Ｗの強度を向上させることができる。
(Example 3)
FIG. 8 shows the crown type cage 1 manufactured by the method for manufacturing the resin cage for bearings of the second embodiment described above. Also in this crown type cage 1, by providing the first resin reservoir portion 60, the position where the weld portion W is generated is controlled, and a portion (thickness is thin) that requires sufficient strength of the crown type cage 1. The formation of the weld part W in the pocket part 11) is suppressed. In addition, since a plurality of second resin reservoir portions 70 into which the dissolved resin G flows after the weld portion W is formed are provided on the outer peripheral side peripheral portion 42 of the cavity 40, the reinforcing fiber of the weld portion W The orientation is disturbed and the strength of the weld portion W can be improved.
（実施例４）
また、上述した第２実施形態の軸受用樹脂製保持器の製造方法は、図９に示すような円すいころ軸受用保持器２０を製造する際に適用してもよい。
この円すいころ軸受用保持器２０においても、第２実施形態の軸受用樹脂製保持器の製造方法によれば、肉厚が薄いポケット部２３にウェルド部Ｗが発生しないように、ウェルド部Ｗの発生位置を制御することが可能であるので、十分な強度を必要とする部分におけるウェルド部の形成を抑制することが可能となる。
その他の効果は、実施例３と同様である。
Example 4
Moreover, you may apply the manufacturing method of the resin cage for bearings of 2nd Embodiment mentioned above when manufacturing the tapered roller bearing cage 20 as shown in FIG.
Also in this tapered roller bearing retainer 20, according to the bearing resin retainer manufacturing method of the second embodiment, the weld portion W is prevented from being generated in the pocket portion 23 having a small wall thickness. Since the generation position can be controlled, it is possible to suppress formation of a weld portion in a portion that requires sufficient strength.
Other effects are the same as in the third embodiment.
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。
例えば、上述の実施形態においては、ゲート５０の数は、１つ又は３つとしているが、特に限定されるものではなく、任意の数に設定可能である。
In addition, this invention is not limited to each embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.
For example, in the above-described embodiment, the number of gates 50 is one or three, but is not particularly limited and can be set to an arbitrary number.
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.
１ 冠型保持器（軸受用樹脂製保持器）
２０ 円すいころ軸受用保持器（軸受用樹脂製保持器）
３０ 成形金型
４０ キャビティ
４２ 外周側周縁部（周縁部）
４４ 内周側周縁部（周縁部）
５０ 樹脂射出ゲート
６０ 第１樹脂溜まり部
６２ 第１連通部
７０ 第２樹脂溜まり部
７２ 第２連通部
Ｇ 溶解樹脂
Ｗ ウェルド部
Ｗ´ 周方向中間部
1 Crown type cage (resin cage for bearings)
20 Tapered roller bearing cage (resin cage for bearings)
30 Molding die 40 Cavity 42 Outer peripheral edge (periphery)
44 Inner peripheral edge (peripheral edge)
50 resin injection gate 60 first resin reservoir 62 first communication 70 second resin reservoir 72 second communication G dissolved resin W weld W ′ circumferential intermediate
Claims (5)
前記キャビティの周縁部には、前記キャビティ内にウェルド部が形成される前に、前記溶解樹脂が流入する少なくとも１つの第１樹脂溜まり部と、前記キャビティ内に前記ウェルド部が形成された後に、前記溶解樹脂が流入する少なくとも１つの第２樹脂溜まり部と、が設けられ、
前記第１樹脂溜まり部は、該第１樹脂溜まり部を設けない場合に前記キャビティ内の前記ウェルド部が形成される位置ならびに前記樹脂射出ゲートと、周方向にラップしない位置において前記キャビティの周縁部に設けられる
ことを特徴とする軸受用樹脂製保持器の製造方法。 Resin cage for bearings molded by injecting molten resin added with reinforcing fibers into the cavity from at least one resin injection gate provided at the peripheral edge of the annular cavity formed in the molding die A manufacturing method of
At the periphery of the cavity, before the weld part is formed in the cavity, at least one first resin reservoir part into which the dissolved resin flows, and after the weld part is formed in the cavity, And at least one second resin reservoir into which the dissolved resin flows, and
When the first resin reservoir is not provided, the first resin reservoir is located at a position where the weld is formed in the cavity and at a position where the resin injection gate does not wrap in the circumferential direction. A method for producing a resin-made cage for a bearing, characterized in that the method is provided.
前記第１樹脂溜まり部は、該第１樹脂溜まり部と前記樹脂射出ゲートとの周方向距離が、前記キャビティの周縁部の周方向長さの１／２と等しくならないように、且つ前記樹脂射出ゲートと周方向にラップしないように、前記キャビティの周縁部に設けられる
ことを特徴とする請求項１に記載の軸受用樹脂製保持器の製造方法。 One of the resin injection gates is provided at the peripheral edge of the cavity;
The first resin reservoir portion is configured such that a circumferential distance between the first resin reservoir portion and the resin injection gate is not equal to ½ of a circumferential length of a peripheral edge portion of the cavity. The method for manufacturing a resin cage for a bearing according to claim 1, wherein the cage is provided at a peripheral portion of the cavity so as not to wrap in a circumferential direction with the gate.
前記第１樹脂溜まり部は、周方向に隣り合う前記樹脂射出ゲートの周方向中間部ならびに前記樹脂射出ゲートと、周方向にラップしない位置において前記キャビティの周縁部に設けられる
ことを特徴とする請求項１に記載の軸受用樹脂製保持器の製造方法。 A plurality of the resin injection gates are provided on a peripheral edge of the cavity;
The said 1st resin reservoir part is provided in the peripheral part of the said cavity in the circumferential direction intermediate part and the said resin injection gate of the said resin injection gate which adjoin the circumferential direction in the position which does not wrap in the circumferential direction. Item 2. A method for producing a resin cage for bearings according to Item 1.
前記第２樹脂溜まり部と前記キャビティの周縁部とは、第２連通部によって連通されており、
前記第１連通部の断面積は、前記ウェルド部が形成される前に、前記第１樹脂溜まり部に前記溶解樹脂が流入可能であるように設定され、
前記第２連通部の断面積は、前記ウェルド部が形成された後に、前記第２樹脂溜まり部に前記溶解樹脂が流入可能であるように設定される
ことを特徴とする請求項１〜３の何れか１項に記載の軸受用樹脂製保持器の製造方法。 The first resin reservoir and the peripheral edge of the cavity are communicated by a first communication part,
The second resin reservoir and the peripheral edge of the cavity are communicated by a second communication part,
The cross-sectional area of the first communication portion is set so that the dissolved resin can flow into the first resin reservoir portion before the weld portion is formed,
The cross-sectional area of the second communication part is set so that the dissolved resin can flow into the second resin reservoir part after the weld part is formed. The manufacturing method of the resin-made cage for bearings of any one of Claims 1.
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