JP2007078118A - Resin retainer, resin retainer mold, and method of manufacturing the resin retainer - Google Patents

Resin retainer, resin retainer mold, and method of manufacturing the resin retainer Download PDF

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JP2007078118A
JP2007078118A JP2005268720A JP2005268720A JP2007078118A JP 2007078118 A JP2007078118 A JP 2007078118A JP 2005268720 A JP2005268720 A JP 2005268720A JP 2005268720 A JP2005268720 A JP 2005268720A JP 2007078118 A JP2007078118 A JP 2007078118A
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gate
resin
resin retainer
retainer
column
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JP4537920B2 (en
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Naota Yamamoto
直太 山本
Makiko Hasegawa
麻記子 長谷川
Tatsuya Minamiyama
竜也 南山
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NTN Corp
Nakanishi Metal Works Co Ltd
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NTN Corp
Nakanishi Metal Works Co Ltd
NTN Toyo Bearing Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/46—Cages for rollers or needles
    • F16C33/49—Cages for rollers or needles comb-shaped
    • F16C33/494—Massive or moulded comb cages
    • F16C33/495—Massive or moulded comb cages formed as one piece cages, i.e. monoblock comb cages
    • F16C33/498—Massive or moulded comb 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
    • F16C19/22—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
    • F16C19/24—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 radial load mainly
    • F16C19/28—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 radial load mainly with two or more rows of rollers
    • 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
    • F16C2220/00—Shaping
    • F16C2220/02—Shaping by casting
    • F16C2220/04—Shaping by casting by injection-moulding

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To prevent burrs from being produced at gate parts in a resin retainer, in which a plurality of columnar parts extending from the inner one end of an annular parts in the axial one direction are formed so that rolling elements can be disposed at equal intervals, and the gate parts formed by integrally injection-molding the annular parts and the columnar parts are exist on the inside of the columnar parts. <P>SOLUTION: The present surfaces 46a of the gate parts 47 are tilted inwardly, toward the ends of the columnar parts 42. When the molded resin retainer 40 is extruded, the molded gate parts 47 can be sheared and separated in a direction that is parallel to the extruding direction of the retainer, and consequently, shearing strain can be prevented from being produced. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

この発明は、複列円筒ころ軸受に好適な樹脂保持器に関する。   The present invention relates to a resin cage suitable for a double row cylindrical roller bearing.

近年、マシニングセンタ、ＣＮＣ旋盤、フライス盤といった工作機械の主軸の支持に用いられる円筒ころ軸受には、運転時の保持器の摩耗粉による潤滑剤劣化の問題や軽量化の点から、合成樹脂製の保持器が利用されるようになっている。   In recent years, cylindrical roller bearings used to support the spindles of machine tools such as machining centers, CNC lathes, and milling machines are made of synthetic resin because of the problem of lubricant deterioration due to wear powder from the cage during operation and weight reduction. A vessel is used.

上記のような樹脂保持器としては、図７に示すように、円環部７１と、円環部７１の内側一端から軸方向の一方に延びた複数の柱部７２と、円周方向に隣接する柱部７２の円周方向側面７２ａ間に形成され、円筒ころを回転自在に保持する複数のポケット７３とを備えた、所謂くし型樹脂保持器と呼ばれるものがある（例えば、特許文献１参照）。   As shown in FIG. 7, the resin holder as described above includes an annular portion 71, a plurality of column portions 72 extending from one inner end of the annular portion 71 in one axial direction, and adjacent in the circumferential direction. There is a so-called comb-shaped resin retainer formed between a plurality of pockets 73 that are formed between the circumferential side surfaces 72a of the column 72 and that holds the cylindrical rollers rotatably (see, for example, Patent Document 1). ).

一般に、上記くし型樹脂保持器は一体射出成形される。この成形金型のキャビティ８０は、成形収縮を考慮して形状が決定されるが、その成形収縮は内向きに生じるため、図８に示すように全体として軸方向Ｚに対して傾き角θをもつ外開きに形成される。この外開き形状は成形材料の特性等に基づいて経験的に決められる。   In general, the comb resin cage is integrally injection molded. The shape of the cavity 80 of this molding die is determined in consideration of molding shrinkage. However, since the molding shrinkage occurs inward, the inclination angle θ as a whole with respect to the axial direction Z as shown in FIG. It is formed to have an outward opening. The shape of the outward opening is determined empirically based on the characteristics of the molding material.

上記くし型樹脂保持器の成形金型では、キャビティ８０のうち上記柱部の内側を成形する部分にゲート８１を位置させたトンネルゲート（サブマリンゲートと称されることもある）構造が好まれている。これは、サイドゲート等のゲート部が製品に残るとゲート処理が必要となるものに対し、トンネルゲートは、金型の構造上、成形品とゲート部がせん断分離されるためにゲート処理がなく、コストダウンを図れるからである。また、トンネルゲートでは、保持器のような円環状部品には樹脂同士に接合面（ウェルド部）の強度劣化を最小限に抑えるために、多点ゲート化を図ることにより、各ゲートで樹脂が固化する前にウェルド部を成形し、保持器強度を高くすることができる。なお、ゲートは、１本おきに設けることでウェルド部が柱の中央に位置するようになり、保持器強度が確保される。   In the mold for the comb resin retainer, a tunnel gate (sometimes referred to as a submarine gate) structure in which a gate 81 is located in a portion of the cavity 80 where the inside of the column portion is molded is preferred. Yes. This is because gate processing such as side gates is required when the gate part remains in the product, whereas tunnel gates do not have gate processing because the molded product and the gate part are sheared and separated due to the structure of the mold. This is because the cost can be reduced. In addition, in tunnel gates, the annular parts such as cages have a multi-point gate to minimize the deterioration of the strength of the joint surface (weld part) between the resins. Prior to solidification, the weld portion can be molded to increase the cage strength. In addition, by providing every other gate, the weld portion is positioned at the center of the column, and the strength of the cage is ensured.

特開２００５−１６３９９７号公報Japanese Patent Laid-Open No. 2005-163997

しかしながら、トンネルゲート構造による射出成形は、型開き後の成形品押し出し力を利用することにより、ゲートのエッジで成形品とゲート部をせん断させることを特徴とする。ところが、くし型樹脂保持器では、上述のようにキャビティ８０が全体として外開き形状に形成されるので、ゲート８１が保持器押し出し方向（図８の例では軸方向Ｚの一方と逆方向）に対して傾き角θをもっており、上記せん断が歪になる。その結果、成形された柱部７２の内側に存在するゲート部７４（ゲート跡として観察される）にバリが生じる。このバリの一部が軸の回転中に脱落すると、柱部の内側は内輪の軌道面に対するため、脱落片が上記軌道面の傷みの原因になり得る。   However, the injection molding by the tunnel gate structure is characterized in that the molded product and the gate part are sheared at the edge of the gate by utilizing the extrusion force of the molded product after the mold opening. However, in the comb-shaped resin cage, the cavity 80 is formed in an outwardly open shape as described above, so that the gate 81 is in the cage pushing direction (in the example of FIG. 8, the direction opposite to one of the axial directions Z). On the other hand, it has an inclination angle θ, and the shear becomes a strain. As a result, burrs are generated in the gate portion 74 (observed as a gate mark) existing inside the molded column portion 72. If a part of this burr falls off during rotation of the shaft, the inner side of the column part is against the raceway surface of the inner ring, and the fallen piece may cause damage to the raceway surface.

そこで、この発明の課題は、円環部の内側一端から軸方向の一方に延びる複数の柱部が転動体を等配するように形成されており、上記円環部と上記柱部の一体射出成形に伴うゲート部が上記柱部の内側に存在する樹脂保持器において、上記ゲート部にバリが生じることを防止することである。   Accordingly, an object of the present invention is to form a plurality of pillars extending from one inner end of the annular part to one side in the axial direction so that the rolling elements are evenly arranged, and integrally injecting the annular part and the pillar part In the resin retainer in which the gate part accompanying the molding exists inside the pillar part, it is to prevent the burr from occurring in the gate part.

上記の課題を解決するため、この発明の樹脂保持器は、上記ゲート部の所在面が柱部先端側に進むに連れて内寄りとなる方向に傾斜する構成を採用した。   In order to solve the above-mentioned problems, the resin retainer of the present invention employs a configuration in which the location surface of the gate portion is inclined in the inward direction as it advances toward the front end side of the column portion.

上記構成によれば、上記ゲート部の所在面を成形するキャビティ部分には、成形品において柱部先端側に進むに連れて内寄りとなる方向に傾斜させるため、キャビティの外開き形状を解消する傾きを与えることになり、その結果、上記ゲート部の所在面と保持器押し出し方向とを平行に設定することが可能になる。すなわち、成形された保持器の押し出し時に、成形されたゲート部を保持器押し出し方向と平行にせん断分離させることが可能になり、その結果、せん断歪が防止されるので、ゲート部にバリが生じることを防止することができる。   According to the above configuration, since the cavity part for molding the location surface of the gate part is inclined in the inward direction as it advances toward the column tip end side in the molded product, the outward opening shape of the cavity is eliminated. As a result, it becomes possible to set the location surface of the gate portion and the direction in which the cage is pushed out in parallel. That is, when the molded cage is pushed out, the molded gate portion can be sheared and separated in parallel with the direction of pushing out the cage. As a result, shear strain is prevented, so that burrs are generated in the gate portion. This can be prevented.

なお、この構成を採用する場合、樹脂保持器を外輪案内または転動体案内方式として軸受を構成すればよい。   In addition, when employ | adopting this structure, what is necessary is just to comprise a bearing by making a resin cage into an outer ring guide or a rolling element guide system.

上記構成において、樹脂保持器を内輪案内方式として軸受を構成する場合、上記ゲート部の所在面が、他の部分よりも外方に凹入している構成を採用すればよい。   In the above configuration, when the bearing is configured using the resin cage as the inner ring guide system, a configuration in which the location surface of the gate portion is recessed outward from the other portions may be employed.

この発明は、換言すれば、円環部と、この円環部の内側一端から軸方向の一方に延ばされ転動体を等配するための複数の柱部とを成形するキャビティを有し、上記キャビティのうち上記柱部の内側を成形する部分にゲートが存在する射出成形用の樹脂保持器金型において、上記ゲートの所在面が保持器押し出し方向と平行に形成されている構成を採用したといえる。   In other words, the present invention has a cavity that molds an annular portion and a plurality of column portions that are extended from one inner end of the annular portion to one side in the axial direction and are equally arranged with rolling elements, In the resin retainer mold for injection molding in which a gate is present in the portion of the cavity that molds the inside of the column part, a configuration is adopted in which the location surface of the gate is formed in parallel with the direction of pushing out the retainer. It can be said.

また、この発明は、円環部の内側面一端から軸方向に延びる複数の柱部が転動体を等配するように形成されており、上記円環部と上記柱部の一体射出成形に伴うゲート部が上記柱部の内側に存在する樹脂保持器の製造方法において、キャビティのゲート所在面を保持器押し出し方向と平行に形成した樹脂保持器金型を用いる構成を採用したともいえる。   Further, the present invention is formed such that a plurality of column portions extending in the axial direction from one end of the inner side surface of the annular portion are equally arranged, and accompanying the integral injection molding of the annular portion and the column portion. In the method for manufacturing a resin cage in which the gate portion is present inside the column portion, it can be said that a configuration using a resin cage mold in which the gate location surface of the cavity is formed in parallel with the direction of pushing out the cage is adopted.

上述のように、この発明によれば、上記ゲート部にバリが生じることを防止することができる。   As described above, according to the present invention, it is possible to prevent burrs from being generated in the gate portion.

以下、この発明の第１実施形態を図面に基づいて説明する。図１に要部を示した複列円筒ころ軸受は、複列の軌道面１１を有する内輪１０と、軌道面２１を有する外輪２０と、内輪１０の軌道面１１及び外輪２０の軌道面２１間に配置された複列の円筒ころ３０と、各列の円筒ころ３０をそれぞれ保持する一対の樹脂保持器４０とを備える。内輪１０の軸方向中央部には中鍔１２が設けられており、また、軸方向両外側の端部には外鍔１３が設けられている。   Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. The double-row cylindrical roller bearing shown in FIG. 1 includes an inner ring 10 having a double-row raceway surface 11, an outer ring 20 having a raceway surface 21, and between the raceway surface 11 of the inner ring 10 and the raceway surface 21 of the outer ring 20. And a pair of resin retainers 40 that respectively hold the cylindrical rollers 30 in each row. An inner collar 12 is provided at the axially central portion of the inner ring 10, and an outer collar 13 is provided at both axially outer ends.

内輪１０は工作機等の主軸外周に嵌合され、外輪２０はハウジングの内周に嵌合される。この複列円筒ころ軸受内は、エアオイルやグリース等の潤滑剤で潤滑され、一般に、ラジアル方向の予圧を付与した状態で使用される。なお、内輪の内周面はテーパ形状であっても良く、したがって、この内輪は、テーパ形状に形成した主軸の外周面、あるいは主軸の外周に嵌合したテーパ状スリーブの外周面に嵌合されるものであっても良い。   The inner ring 10 is fitted to the outer circumference of the main shaft of a machine tool or the like, and the outer ring 20 is fitted to the inner circumference of the housing. The inside of this double row cylindrical roller bearing is lubricated with a lubricant such as air oil or grease, and is generally used with a radial preload applied. Note that the inner peripheral surface of the inner ring may be tapered, and therefore the inner ring is fitted to the outer peripheral surface of the main shaft formed in a tapered shape or the outer peripheral surface of the tapered sleeve fitted to the outer periphery of the main shaft. It may be a thing.

樹脂保持器４０は、図２、図３に示すように、円環部４１と、円環部４１の内側一端４１ａから軸方向Ｚの一方に延びた複数の柱部４２と、円周方向に隣接する柱部４２間に形成され円筒ころ３０（図示省略）を回転自在に保持する複数のポケット４３とを備え、一体射出成形されている。   As shown in FIGS. 2 and 3, the resin retainer 40 includes an annular portion 41, a plurality of column portions 42 extending from one inner end 41 a of the annular portion 41 to one side in the axial direction Z, and a circumferential direction. A plurality of pockets 43 formed between adjacent column portions 42 and rotatably holding cylindrical rollers 30 (not shown) are provided, and are integrally injection-molded.

成形材料としては、例えば、ポリエーテルエーテルケトン樹脂（ＰＥＥＫ）、ポリアミド樹脂（ＰＡ：ＰＡ６６、ＰＡ４６）、ポリフェニレンサルファイド樹脂（ＰＰＳ）等の自己潤滑性を有する合成樹脂を用いることができ、必要に応じてカーボンファイバ（ＣＦ）、グラスファイバ（ＧＦ）等の充填材を配合してもよい。   As the molding material, for example, a synthetic resin having self-lubricating properties such as polyetheretherketone resin (PEEK), polyamide resin (PA: PA66, PA46), polyphenylene sulfide resin (PPS) can be used. Further, a filler such as carbon fiber (CF) or glass fiber (GF) may be blended.

複数の柱部４２は円周等配位置に配列されている。各ポケット４３は円周方向に隣接する柱部４２の円周方向側面４２ａと円環部４１の軸方向Ｚの一方側壁面４１ｂとで三方から囲まれ、軸方向の一方に向かって開口している。   The plurality of column portions 42 are arranged at circumferentially equidistant positions. Each pocket 43 is surrounded from three sides by the circumferential side surface 42a of the column portion 42 adjacent to the circumferential direction and the one side wall surface 41b of the annular portion 41 in the axial direction Z, and opens toward one side in the axial direction. Yes.

柱部４２の円周方向側面４２ａは、ポケット４３のポケット中心Ｏを通るポケットＰＣＤ（図２に示す例では、ポケットＰＣＤは円筒ころ３０の中心を通るころＰＣＤと等しい。）から内側及び外側に亘って形成された円弧面（円筒面）４２ｂを有する。   The circumferential side surface 42a of the column part 42 is inward and outward from the pocket PCD passing through the pocket center O of the pocket 43 (in the example shown in FIG. 2, the pocket PCD is equal to the roller PCD passing through the center of the cylindrical roller 30). It has a circular arc surface (cylindrical surface) 42b formed over it.

円弧面４２ｂは、高速回転時における円筒ころ３０の等配機能を確保するため、柱部４２が遠心力によって外径側に弾性変形したときに円筒ころ３０の転動面を案内するようになっている。   The arc surface 42b guides the rolling surface of the cylindrical roller 30 when the column portion 42 is elastically deformed to the outer diameter side by centrifugal force in order to ensure the equal distribution function of the cylindrical roller 30 during high-speed rotation. ing.

相対向する円弧面４２ｂの内端間距離Ｗ１および外端間距離Ｗ２は、円筒ころ３０の直径よりも小さく設定されており、その結果、ポケット４３から円筒ころ３０が内外両側へ抜けることが規制される。   The distance W1 between the inner ends and the distance W2 between the outer ends of the arcuate surfaces 42b facing each other are set to be smaller than the diameter of the cylindrical roller 30, and as a result, the cylindrical roller 30 is restricted from coming out from the pocket 43 to both the inner and outer sides. Is done.

なお、保持器４０は、転動体案内形式が採用されており、軸受回転時、柱部４２の円周方向側面４２ａが円筒ころ３０の転動面に接触案内されながら回転する。   In addition, the rolling element guide type is employ | adopted for the holder | retainer 40, and when the bearing rotates, the circumferential direction side surface 42a of the column part 42 rotates, contacting and guiding to the rolling surface of the cylindrical roller 30.

また、円周方向側面４２ａの先端側には、潤滑剤溜り部を兼ねた逃げ部４４が形成されている。この逃げ部４４は、その先端及び内端が開放された凹状で、その外端に湾曲凹状の段差部４４ａを有し、上記ポケットＰＣＤを境として柱部４２の内周側に配置されている。円筒ころ３０を覆っているグリースや油等の潤滑剤が、柱部４２の円弧面４２ｂによって掻き取られても、逃げ部４４から潤滑剤が補充される。   In addition, an escape portion 44 that also serves as a lubricant reservoir is formed on the tip side of the circumferential side surface 42a. The escape portion 44 has a concave shape with its front end and inner end open, has a curved concave step portion 44a at its outer end, and is disposed on the inner peripheral side of the column portion 42 with the pocket PCD as a boundary. . Even if the lubricant such as grease or oil covering the cylindrical roller 30 is scraped off by the arc surface 42 b of the column portion 42, the lubricant is replenished from the escape portion 44.

逃げ部４４の円周方向側面は、柱部４２の円周方向中心を通る半径線ｒと平行なストレート面になっており、柱部４２が遠心力により半径線ｒに沿って外径側に変位しても、円筒ころ３０の転動面との接触が回避されるようになっている。逃げ部４４の軸方向長さは、例えば、円筒ころ３０の軸方向長さの１０％〜３５％にすることができる。   The circumferential side surface of the escape portion 44 is a straight surface parallel to the radial line r passing through the center of the column portion 42 in the circumferential direction, and the column portion 42 is moved to the outer diameter side along the radial line r by centrifugal force. Even when displaced, contact with the rolling surface of the cylindrical roller 30 is avoided. The axial length of the escape portion 44 can be, for example, 10% to 35% of the axial length of the cylindrical roller 30.

また、柱部４２の円周方向側面４２ａは、円筒ころ３０の潤滑を向上させるため、溝状の潤滑剤溜り部４５を逃げ部４４の外側かつポケットＰＣＤを境として柱部４２の外側に有する。この潤滑剤溜り部４５は、先端のみが開放された状態となる直線状に形成され、図１に示すように円筒ころ３０の軸方向中央付近に位置するようになっている。   Further, the circumferential side surface 42a of the column portion 42 has a groove-like lubricant reservoir 45 on the outside of the escape portion 44 and outside the column portion 42 with the pocket PCD as a boundary in order to improve the lubrication of the cylindrical roller 30. . The lubricant reservoir 45 is formed in a linear shape with only the tip opened, and is located near the axial center of the cylindrical roller 30 as shown in FIG.

なお、逃げ部４４と潤滑剤溜り部４５は、遠心力により柱部４２が外側に弾性変形しても潤滑剤が一挙に排出しないように、図３に示す如く全体として柱部先端側に進むに連れて内寄りとなる方向に傾斜している。なお、上記の傾斜角は、軸方向Ｚに対して２〜１０度にすることができる。   As shown in FIG. 3, the escape portion 44 and the lubricant reservoir 45 as a whole advance toward the front end side of the column portion so that the lubricant is not discharged at once even if the column portion 42 is elastically deformed outward by centrifugal force. It inclines in the direction that becomes inward. The inclination angle can be 2 to 10 degrees with respect to the axial direction Z.

図２、図３に示すように、上記柱部４２の内側を構成する内径面４６は、上記円環部４１と上記柱部４２、すなわち樹脂保持器４０の一体射出成形に伴うゲート部４７が存在する所在面４６ａを有する。この所在面４６ａは、軸方向Ｚに沿って上記柱部４２の中ほどから先端側に進むに連れて内寄りとなる方向に傾斜している。なお、樹脂保持器４０では、その真円度を高めるため、ゲート部４７は、複数の柱部４２の円周等配位置に関しウェルド部（図示省略）と交互に配置されている。   As shown in FIGS. 2 and 3, the inner diameter surface 46 constituting the inner side of the column part 42 is formed by the gate part 47 accompanying the integral injection molding of the annular part 41 and the column part 42, that is, the resin holder 40. It has an existing location surface 46a. This location surface 46a is inclined along the axial direction Z in a direction that becomes inward as it advances from the middle of the column part 42 to the tip side. In the resin retainer 40, the gate portions 47 are alternately arranged with weld portions (not shown) at the circumferentially equidistant positions of the plurality of column portions 42 in order to increase the roundness.

上記所在面４６ａの傾きは、成形された樹脂保持器４０の押し出し時に、成形された所在面４６ａと保持器押し出し方向とが平行になるように定められる。   The inclination of the location surface 46a is determined so that the molded location surface 46a and the cage extrusion direction are parallel when the molded resin cage 40 is pushed out.

図４に要部を示した樹脂保持器４０の射出成形用金型は、図３と対比すれば明らかなように、そのキャビティ５０が上記円環部４１の成形空間５１と上記柱部４２の成形空間５２とを有する。キャビティ５０は、軸方向Ｚに沿って柱部先端成形面５３側に進むに連れて全体として外開き状に形成されている。この外開きの軸方向Ｚに対する傾き角θは、樹脂保持器４０の成形収縮を考慮して、成形された柱部４２が軸方向Ｚに平行するように決定される。   The mold for injection molding of the resin retainer 40 shown in FIG. 4 shows that the cavity 50 is formed between the molding space 51 of the annular part 41 and the column part 42, as is clear from comparison with FIG. And a molding space 52. The cavity 50 is formed in an outwardly opening shape as a whole proceeds toward the columnar tip forming surface 53 along the axial direction Z. The inclination angle θ of the outward opening with respect to the axial direction Z is determined so that the molded column portion 42 is parallel to the axial direction Z in consideration of molding shrinkage of the resin cage 40.

上記成形空間５２の柱部内側成形面５４（柱部の内側を成形する部分）には、ゲート５５が形成されている。この第１実施形態において、ゲート５５はキャビティプレートにトンネルゲート構造で形成されている。また、保持器押し出し方向は、軸方向Ｚと平行に設定されており、エジェクタピン（図示省略）の進出方向（つまり軸方向Ｚの一方と逆方向）に一致している。   A gate 55 is formed on the columnar inner molding surface 54 of the molding space 52 (portion for molding the inner side of the column). In the first embodiment, the gate 55 is formed in the cavity plate with a tunnel gate structure. The cage push-out direction is set in parallel with the axial direction Z, and coincides with the advancing direction of the ejector pin (not shown) (that is, the direction opposite to one of the axial directions Z).

ゲート５５の所在面５６は、上記ゲート部４７の所在面４６ａを成形する部分に相当し、軸方向Ｚに沿って柱部先端成形面５３側に進むに連れて内寄りに傾斜している。この所在面５６が柱部内側成形面５４の他の部分との間に有する傾き角αは、この第１実施形態において軸方向Ｚに対する傾き角とも考えられ、上記傾き角θと同じに設定されている。これにより、所在面５６においてキャビティ５０の外開き状が解消され、ゲート５５の所在面５６が軸方向Ｚに平行、すなわち、保持器押し出し方向と平行に形成されている。   The location surface 56 of the gate 55 corresponds to a portion for molding the location surface 46a of the gate portion 47, and inclines inward as it advances along the axial direction Z toward the column tip end molding surface 53 side. The inclination angle α between the location surface 56 and the other part of the columnar inner molding surface 54 is also considered as the inclination angle with respect to the axial direction Z in the first embodiment, and is set to be the same as the inclination angle θ. ing. As a result, the outward opening of the cavity 50 is eliminated on the location surface 56, and the location surface 56 of the gate 55 is formed in parallel with the axial direction Z, that is, in parallel with the cage pushing direction.

したがって、成形された保持器の押し出し時に、成形された上記ゲート部４７が保持器押し出し方向と平行にせん断分離されることになり、その結果、せん断歪が防止されるので、ゲート部４７にバリが生じることを防止することができる。   Therefore, when the molded cage is extruded, the molded gate portion 47 is sheared and separated in parallel with the cage extrusion direction. As a result, shear strain is prevented, so Can be prevented.

この発明の第２実施形態について述べる。なお、以下においては、上述の第１実施形態に係る樹脂保持器４０との相違点を主として述べ、共通の構成要素については該当する各図に同一符号を付し、重複する説明を省略する。   A second embodiment of the present invention will be described. In the following description, differences from the above-described resin retainer 40 according to the first embodiment will be mainly described, and common constituent elements will be denoted by the same reference numerals and overlapping description will be omitted.

図５に示した第２実施形態に係る樹脂保持器は、ゲート部４７の所在面６０が、円環部４１の内側一端４１ａから先端面取り部まで形成されており、かつ上記内側一端４１ａよりも内方に位置するように形成されている。その結果、上記所在面６０の形成に伴い、柱部４２には、半径方向の肉厚部が形成されることになり、柱部４２の遠心力に対する剛性が高まる。   In the resin retainer according to the second embodiment shown in FIG. 5, the location surface 60 of the gate portion 47 is formed from the inner end 41a to the tip chamfered portion of the annular portion 41, and more than the inner end 41a. It is formed so as to be located inward. As a result, along with the formation of the location surface 60, a radial thick portion is formed in the pillar portion 42, and the rigidity of the pillar portion 42 with respect to centrifugal force is increased.

したがって、柱部４２が両周方向側面４２ａに逃げ部４４や潤滑剤溜り部４５を有する構成においては、上記所在面６０を柱部４２の内径面４６に形成することにより、上記バリ発生を防止しつつ、その両周方向側面４２ａに逃げ部４４や潤滑剤溜り部４５を形成することで懸念される剛性低下を解消することができる。なお、上記所在面６０は、少なくとも柱部４２の先端側に形成されていればよい。   Accordingly, in the configuration in which the column portion 42 has the relief portion 44 and the lubricant reservoir portion 45 on both circumferential side surfaces 42a, the occurrence of the burr can be prevented by forming the location surface 60 on the inner diameter surface 46 of the column portion 42. However, by forming the escape portion 44 and the lubricant reservoir 45 on the circumferential side surfaces 42a, it is possible to eliminate the decrease in rigidity that is a concern. The location surface 60 only needs to be formed at least on the distal end side of the column portion 42.

この発明の第３実施形態について述べる。図６に示した第３実施形態に係る樹脂保持器は、上記ゲート部４７の所在面６１が、柱部４２の両逃げ部４４間において他の部分よりも外方に凹入している。これにより、上記所在面６１と内輪１０（図示省略）の干渉は回避され、樹脂保持器を内輪案内形式とすることが容易になる。   A third embodiment of the present invention will be described. In the resin retainer according to the third embodiment shown in FIG. 6, the location surface 61 of the gate portion 47 is recessed outwardly from the other portions between both relief portions 44 of the column portion 42. Thereby, the interference between the location surface 61 and the inner ring 10 (not shown) is avoided, and the resin retainer can be easily formed into the inner ring guide type.

第１実施形態に係る複列円筒ころ軸受の要部を示す断面図Sectional drawing which shows the principal part of the double row cylindrical roller bearing which concerns on 1st Embodiment. 第１実施形態に係る樹脂保持器を柱部の先端側から見た部分側面図The partial side view which looked at the resin retainer concerning a 1st embodiment from the tip side of a pillar part （ａ）第１実施形態に係る樹脂保持器の要部を示す断面図、（ｂ）第１実施形態に係る樹脂保持器の要部を示す斜視図(A) Sectional drawing which shows the principal part of the resin retainer which concerns on 1st Embodiment, (b) The perspective view which shows the principal part of the resin retainer which concerns on 1st Embodiment. 第１実施形態に係る樹脂保持器の射出成形用金型の要部を示す断面図Sectional drawing which shows the principal part of the injection die of the resin cage concerning 1st Embodiment （ａ）第２実施形態に係る樹脂保持器の要部を示す断面図、（ｂ）（ａ）を内側からの視線で示す平面図(A) Sectional drawing which shows the principal part of the resin holder which concerns on 2nd Embodiment, (b) The top view which shows (a) by the eyes | visual_axis from an inner side （ａ）第３実施形態に係る樹脂保持器の要部を示す断面図、（ｂ）（ａ）を内側からの視線で示す平面図(A) Sectional drawing which shows the principal part of the resin holder which concerns on 3rd Embodiment, (b) The top view which shows (a) by the eyes | visual_axis from an inner side （ａ）従来例を柱部の先端側から見た部分側面図、（ｂ）従来例の樹脂保持器の要部を示す断面図、（ｃ）（ｂ）を内側からの視線で示す平面図(A) The partial side view which looked at the conventional example from the front end side of a pillar part, (b) Sectional drawing which shows the principal part of the resin holder of a prior art example, (c) (b) The top view which shows the line of sight from the inside 従来例の射出成形用金型の要部を示す断面図Sectional drawing which shows the principal part of the injection mold of a prior art example

符号の説明Explanation of symbols

３０ 円筒ころ
４０ 樹脂保持器
４１ 円環部
４１ａ 内側一端
４２ 柱部
４６ａ、６０、６１ 所在面
４７ ゲート部
５０ キャビティ
５５ ゲート
５６ 所在面 30 Cylindrical roller 40 Resin retainer 41 Annular portion 41a Inner end 42 Columns 46a, 60, 61 Location surface 47 Gate portion 50 Cavity 55 Gate 56 Location surface

Claims (5)

円環部の内側一端から軸方向の一方に延びる複数の柱部が転動体を等配するように形成されており、上記円環部と上記柱部の一体射出成形に伴うゲート部が上記柱部の内側に存在する樹脂保持器において、上記ゲート部の所在面が柱部先端側に進むに連れて内寄りとなる方向に傾斜することを特徴とする樹脂保持器。   A plurality of pillars extending from one inner end of the annular part to one side in the axial direction are formed so that rolling elements are equally arranged, and the gate part accompanying integral injection molding of the annular part and the pillar part is the pillar. In the resin retainer existing inside the portion, the location surface of the gate portion is inclined in an inward direction as it advances toward the tip end side of the column portion. 上記ゲート部の所在面が、少なくとも上記柱部先端側に形成され、かつ上記円環部の内側一端よりも内方に位置する請求項１に記載の樹脂保持器。   The resin retainer according to claim 1, wherein a location surface of the gate portion is formed at least on a tip end side of the column portion and is located inward from an inner end of the annular portion. 上記ゲート部の所在面が、他の部分よりも外方に凹入している請求項１に記載の樹脂保持器。   The resin retainer according to claim 1, wherein a location surface of the gate portion is recessed outward from other portions. 円環部と、この円環部の内側一端から軸方向の一方に延ばされ転動体を等配するための複数の柱部とを成形するキャビティを有し、上記キャビティのうち上記柱部の内側を成形する部分にゲートが存在する射出成形用の樹脂保持器金型において、上記ゲートの所在面が保持器押し出し方向と平行に形成されていることを特徴とする樹脂保持器金型。   A cavity for forming an annular part and a plurality of pillars extending from one inner end of the annular part to one side in the axial direction for evenly distributing rolling elements; A resin retainer mold for injection molding in which a gate is present in a portion to be molded on the inside, wherein a location surface of the gate is formed in parallel with a retainer pushing direction. 円環部の内側面一端から軸方向に延びる複数の柱部が転動体を等配するように形成されており、上記円環部と上記柱部の一体射出成形に伴うゲート部が上記柱部の内側に存在する樹脂保持器の製造方法において、キャビティのゲート所在面を保持器押し出し方向と平行に形成した樹脂保持器金型を用いることを特徴とする樹脂保持器の製造方法。   A plurality of pillars extending in the axial direction from one end of the inner surface of the annular part are formed so that rolling elements are equally arranged, and the gate part associated with integral injection molding of the annular part and the pillar part is the pillar part. A method for manufacturing a resin cage, comprising: a resin cage mold in which a gate location surface of a cavity is formed in parallel with a direction in which the cage is pushed out.
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010095647A1 (en) 2009-02-20 2010-08-26 Ntn株式会社 Holder, rolling bearing, method of manufacturing holder and injection molding die
JP2010196832A (en) * 2009-02-26 2010-09-09 Nsk Ltd Resin cage for roller bearing
WO2011111729A1 (en) 2010-03-10 2011-09-15 Ntn株式会社 Cage and rolling bearing
WO2012063694A1 (en) 2010-11-10 2012-05-18 Ntn株式会社 Comb-shaped resin retainer and roller bearing
JP2014202253A (en) * 2013-04-03 2014-10-27 株式会社ジェイテクト Comb-shaped cage for double row roller bearing, and double row roller bearing
CN105508417A (en) * 2015-12-29 2016-04-20 瓦房店轴承集团有限责任公司 Self-aligning roller bearing for retainer compound guiding large cement roller press
JP2020070814A (en) * 2018-10-29 2020-05-07 Ntn株式会社 Ball bearing

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61197817A (en) * 1984-12-04 1986-09-02 エッセカッパエッフェ　インドゥストリエ　ソチエタ　ペル　アツィオニ Spacing-retainer
JPH07317773A (en) * 1994-05-26 1995-12-08 Koyo Seiko Co Ltd Manufacture of holder made of synthetic resin
JPH10311338A (en) * 1997-05-12 1998-11-24 Koyo Seiko Co Ltd Synthetic resin-made holder for roller bearing and manufacture therof
JPH11166544A (en) * 1997-10-01 1999-06-22 Nippon Seiko Kk Synthetic resin cage for roller bearing
WO2003029670A1 (en) * 2001-09-10 2003-04-10 Nsk Ltd. Roller bearing, and double row cylindrical roller bearing
JP2004068861A (en) * 2002-08-02 2004-03-04 Nsk Ltd Rolling bearing manufacturing method and rolling bearing
JP2004197831A (en) * 2002-12-18 2004-07-15 Nsk Ltd Rolling bearing
JP2005083406A (en) * 2003-09-04 2005-03-31 Nsk Ltd Retainer and its manufacturing method

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61197817A (en) * 1984-12-04 1986-09-02 エッセカッパエッフェ　インドゥストリエ　ソチエタ　ペル　アツィオニ Spacing-retainer
JPH07317773A (en) * 1994-05-26 1995-12-08 Koyo Seiko Co Ltd Manufacture of holder made of synthetic resin
JPH10311338A (en) * 1997-05-12 1998-11-24 Koyo Seiko Co Ltd Synthetic resin-made holder for roller bearing and manufacture therof
JPH11166544A (en) * 1997-10-01 1999-06-22 Nippon Seiko Kk Synthetic resin cage for roller bearing
WO2003029670A1 (en) * 2001-09-10 2003-04-10 Nsk Ltd. Roller bearing, and double row cylindrical roller bearing
JP2004068861A (en) * 2002-08-02 2004-03-04 Nsk Ltd Rolling bearing manufacturing method and rolling bearing
JP2004197831A (en) * 2002-12-18 2004-07-15 Nsk Ltd Rolling bearing
JP2005083406A (en) * 2003-09-04 2005-03-31 Nsk Ltd Retainer and its manufacturing method

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010095647A1 (en) 2009-02-20 2010-08-26 Ntn株式会社 Holder, rolling bearing, method of manufacturing holder and injection molding die
US9192986B2 (en) 2009-02-20 2015-11-24 Ntn Corporation Cage, rolling bearing, method for manufacturing cage, and injection mold
JP2010196832A (en) * 2009-02-26 2010-09-09 Nsk Ltd Resin cage for roller bearing
WO2011111729A1 (en) 2010-03-10 2011-09-15 Ntn株式会社 Cage and rolling bearing
US9284982B2 (en) 2010-03-10 2016-03-15 Ntn Corporation Cage and rolling bearing
WO2012063694A1 (en) 2010-11-10 2012-05-18 Ntn株式会社 Comb-shaped resin retainer and roller bearing
US8641291B2 (en) 2010-11-10 2014-02-04 Ntn Corporation Comb-shaped resin retainer and roller bearing
JP2014202253A (en) * 2013-04-03 2014-10-27 株式会社ジェイテクト Comb-shaped cage for double row roller bearing, and double row roller bearing
CN105508417A (en) * 2015-12-29 2016-04-20 瓦房店轴承集团有限责任公司 Self-aligning roller bearing for retainer compound guiding large cement roller press
JP2020070814A (en) * 2018-10-29 2020-05-07 Ntn株式会社 Ball bearing
WO2020090572A1 (en) * 2018-10-29 2020-05-07 Ntn株式会社 Ball bearing

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