JP2007170470A - Retainer made of synthetic resin for angular ball bearing, and angular ball bearing - Google Patents

Retainer made of synthetic resin for angular ball bearing, and angular ball bearing Download PDF

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Publication number
JP2007170470A
JP2007170470A JP2005366263A JP2005366263A JP2007170470A JP 2007170470 A JP2007170470 A JP 2007170470A JP 2005366263 A JP2005366263 A JP 2005366263A JP 2005366263 A JP2005366263 A JP 2005366263A JP 2007170470 A JP2007170470 A JP 2007170470A
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Prior art keywords
cage
ball
bearing
ball bearing
angular ball
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JP2005366263A
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Japanese (ja)
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Yasuyuki Hirota
泰之 廣田
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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Priority to JP2005366263A priority Critical patent/JP2007170470A/en
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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
    • F16C33/3887—Details of individual pockets, e.g. shape or ball retaining means
    • 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
    • F16C33/3837—Massive or moulded cages having cage pockets surrounding the balls, e.g. machined window cages
    • F16C33/3843—Massive or moulded cages having cage pockets surrounding the balls, e.g. machined window cages formed as one-piece cages, i.e. monoblock cages
    • F16C33/3856—Massive or moulded cages having cage pockets surrounding the balls, e.g. machined window cages formed as one-piece cages, i.e. monoblock cages made from plastic, e.g. injection moulded window 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
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/16—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row of balls
    • F16C19/163—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row of balls with angular contact
    • 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
    • F16C2322/00—Apparatus used in shaping articles
    • F16C2322/39—General buildup of machine tools, e.g. spindles, slides, actuators
    • 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
    • F16C33/66—Special parts or details in view of lubrication
    • F16C33/6603—Special parts or details in view of lubrication with grease as lubricant

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an angular ball bearing which can stabilize the behavior of a retainer during the rotation of the bearing and suppress the generation of noise. <P>SOLUTION: Pockets 7 are formed in the retainer 3 arranged between an outer race 1 and an inner race 2. Balls 4 are arranged in the pockets 7. A pair of end surfaces 7a, 7b of the pocket 7 opposed to each other in the circumference of the retainer is formed as planes which are in parallel with a virtual plane including the center of the ball 4 and the center line of the bearing. As a result, even if the retainer 3 has been displaced in the axial direction during the rotation of the bearing, the balls 4 apply forces to the retainer 3 only in the circumference of the retainer 3. Therefore, the behavior of the retainer can be stabilized, and the generation of the noise can be suppressed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

この発明は、一般の産業機械に用いられるアンギュラ玉軸受用の合成樹脂製保持器およびアンギュラ玉軸受に関するものである。   The present invention relates to a synthetic resin cage and an angular ball bearing for angular ball bearings used in general industrial machines.

工作機械は、生産性の向上のため、高効率化が急速に進む現状にある。その工作機械の主軸を回転自在に支持する軸受として、アンギュラ玉軸受、円筒ころ軸受、円錐ころ軸受が一般的に使用されている。   Machine tools are in the present situation where efficiency is rapidly increasing in order to improve productivity. Angular ball bearings, cylindrical roller bearings, and tapered roller bearings are generally used as bearings that rotatably support the spindle of the machine tool.

これらの軸受のうち、アンギュラ玉軸受は、高速性に優れているため、高効率化が求められる工作機械に採用される傾向が増加している。   Among these bearings, angular ball bearings are excellent in high-speed performance, and are therefore increasingly used in machine tools that require high efficiency.

アンギュラ玉軸受には、例えば、特許文献１に記載されているように、保持器を転動体で案内する転動体案内タイプと、外輪または内輪で保持器を案内する軌道輪案内タイプとが存在する。   Angular ball bearings include, for example, a rolling element guide type that guides a cage with a rolling element and a race ring guide type that guides the cage with an outer ring or an inner ring, as described in Patent Document 1. .

アンギュラ玉軸受の潤滑には、オイルエアーによる潤滑方式と、グリースによる潤滑方式とがあり、オイルエアー潤滑は、グリース潤滑に比較して高速性に優れるものの、環境問題を発生させる可能性があり、その環境の負荷低減の配慮からグリース潤滑する方式が採用されることが多くなっている。   There are two types of lubrication for angular ball bearings: oil-air lubrication and grease lubrication. Although oil-air lubrication is superior to grease lubrication, it may cause environmental problems. In order to reduce the environmental load, grease lubrication is increasingly used.

ところで、保持器を転動体案内するグリース潤滑のアンギュラ玉軸受においては、使用可能な回転速度領域はｄｎ８５万程度が上限であるため、高効率化が要求される工作機械の主軸支持用に採用することはできず、上記高効率化の要求を満足させるには、保持器を軌道輪案内するアンギュラ玉軸受が不可欠になってくる。
特開平７−４４３９号公報 By the way, in the grease-lubricated angular contact ball bearing that guides the cage to the rolling element, the usable rotational speed range is about dn 850,000, so it is adopted for supporting the spindle of a machine tool that requires high efficiency. Therefore, in order to satisfy the above-mentioned demand for higher efficiency, an angular ball bearing that guides the cage with the raceway ring is indispensable.
Japanese Patent Laid-Open No. 7-4439

ところで、保持器を軌道輪案内する従来のアンギュラ玉軸受においては、図３(Ｉ)に示すように、保持器１１に形成されたポケット１２が円筒形であり、そのポケット１２とその内部に組込まれたボール１３との間にポケット隙間δが形成されているため、アンギュラ玉軸受の回転時、保持器１１はポケット隙間δ分だけ軸方向に変位することがある。   By the way, in the conventional angular ball bearing for guiding the cage to the raceway, as shown in FIG. 3 (I), the pocket 12 formed in the cage 11 is cylindrical, and is incorporated into the pocket 12 and the inside thereof. Since the pocket gap δ is formed between the ball 13 and the ball 13, the cage 11 may be displaced in the axial direction by the pocket gap δ when the angular ball bearing rotates.

保持器１１が軸方向に変位すると、保持器１１の挙動が不安定になり易く、振動を発生させることになる。すなわち、軸受回転時、保持器１１が軸方向に変位しない状態では、ボール１３から保持器１１に負荷される荷重の方向は、図３(ＩＩ)の矢印(イ)で示すように、保持器１１の周方向に作用するが、保持器１１が軸方向に変位することでボール１３から保持器１１に負荷される荷重の方向が、図３(ＩＩＩ)の矢印(ロ)で示すように斜め方向に変化し、保持器１１に振動を与えることになる。   When the cage 11 is displaced in the axial direction, the behavior of the cage 11 is likely to be unstable, and vibration is generated. That is, when the cage 11 is not displaced in the axial direction when the bearing rotates, the direction of the load applied from the ball 13 to the cage 11 is as shown by the arrow (A) in FIG. 11 acts in the circumferential direction, but the direction of the load applied to the cage 11 from the ball 13 when the cage 11 is displaced in the axial direction is oblique as shown by the arrow (b) in FIG. The direction changes, and the cage 11 is vibrated.

この振動により、保持器１１とその保持器１１の案内面である外輪内径面の接触が不安定になり、潤滑不良から異音の発生を引き起こす。   Due to this vibration, the contact between the cage 11 and the inner surface of the outer ring, which is the guide surface of the cage 11, becomes unstable, and abnormal noise is generated due to poor lubrication.

この発明の課題は、軸受回転時の保持器の挙動の安定化を図り、異音の発生を抑制することができるようにしたアンギュラ玉軸受用の合成樹脂製保持器およびアンギュラ玉軸受を提供することである。   An object of the present invention is to provide a synthetic resin cage and an angular ball bearing for an angular ball bearing that can stabilize the behavior of the cage during rotation of the bearing and suppress the generation of abnormal noise. That is.

上記の課題を解決するため、この発明に係るアンギュラ玉軸受用の合成樹脂製保持器においては、ボール組込み用の複数のポケットが周方向に間隔をおいて形成された軌道輪案内されるアンギュラ玉軸受用の合成樹脂製保持器において、前記ポケットの保持器周方向で対向する一対の端面を、ボールの中心および軸受中心線を含む仮想平面に平行する平面とした構成を採用したのである。   In order to solve the above-mentioned problem, in the synthetic resin cage for an angular ball bearing according to the present invention, a plurality of pockets for ball incorporation are guided in the circumferential direction and are guided by the bearing ring. In the synthetic resin cage for the bearing, a configuration is adopted in which the pair of end faces opposed in the circumferential direction of the cage of the pocket are planes parallel to a virtual plane including the center of the ball and the bearing center line.

また、この発明に係るアンギュラ玉軸受においては、外輪と内輪間に、軌道輪案内される合成樹脂製の保持器を組込み、その保持器に形成された複数のポケットのそれぞれ内部にボールを組込んだアンギュラ玉軸受において、前記ポケットの保持器周方向で対向する一対の端面を、ボールの中心および軸受中心線を含む仮想平面に平行する平面とした構成を採用したのである。   Further, in the angular ball bearing according to the present invention, a synthetic resin cage that is guided by the raceway is incorporated between the outer ring and the inner ring, and the ball is incorporated in each of a plurality of pockets formed in the cage. In the angular ball bearing, a configuration is adopted in which a pair of end faces opposed to each other in the circumferential direction of the cage of the pocket are planes parallel to a virtual plane including the center of the ball and the bearing center line.

上記のように、保持器に形成されたポケットの保持器周方向で対向する一対の端面を、ボールの中心および軸受中心線を含む仮想平面に平行する平面としたことによって、軸受回転時に保持器が軸方向に変位したとしても、ボールから保持器に負荷される荷重は常に保持器の周方向に作用する。   As described above, the pair of end faces opposed to each other in the circumferential direction of the cage formed in the cage are planes parallel to an imaginary plane including the center of the ball and the bearing center line. Even if is displaced in the axial direction, the load applied to the cage from the ball always acts in the circumferential direction of the cage.

このように、ボールから保持器に負荷される荷重の方向が一定とされることで、保持器の挙動が安定し、異音の発生を抑制することができる。   Thus, by making the direction of the load applied from the ball to the cage constant, the behavior of the cage is stabilized and the generation of abnormal noise can be suppressed.

以下、この発明の実施の形態を図１および図２に基いて説明する。図１に示すように、アンギュラ玉軸受は、外輪１と、その内側に組込まれた内輪２と、上記外輪１と内輪２間に組込まれた保持器３および保持器３に保持されたボール４とからなる。   Hereinafter, an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the angular ball bearing includes an outer ring 1, an inner ring 2 built inside the outer ring 1, a cage 3 built between the outer ring 1 and the inner ring 2, and a ball 4 held by the cage 3. It consists of.

外輪１は、内径面に軌道溝５を有し、その軌道溝５と内輪２の外径面に形成された軌道溝６間に上記ボール４が組込まれている。   The outer ring 1 has a raceway groove 5 on the inner diameter surface, and the ball 4 is incorporated between the raceway groove 5 and the raceway groove 6 formed on the outer diameter surface of the inner ring 2.

保持器３は、フェノール樹脂等の合成樹脂から成り、その保持器３にはボール４を保持する複数のポケット７が周方向に等間隔に設けられている。   The cage 3 is made of a synthetic resin such as phenol resin, and the cage 3 is provided with a plurality of pockets 7 for holding the balls 4 at equal intervals in the circumferential direction.

図２(Ｉ)に示すように、各ポケット７の保持器周方向で対向する一対の端面７ａ，７ｂは、ボール４の中心および軸受中心線を含む仮想平面に平行する平面とされ、その端面７ａ，７ｂとボール４との間には周方向のポケット隙間ａが設けられている。   As shown in FIG. 2 (I), the pair of end faces 7a and 7b facing each other in the circumferential direction of the cage of each pocket 7 is a plane parallel to a virtual plane including the center of the ball 4 and the bearing center line. A pocket gap a in the circumferential direction is provided between the balls 7a and 7b.

一方、ポケット７の保持器軸方向で対向する一対の側面７ｃ，７ｄは、ボール４の半径より曲率半径の大きい円弧面とされ、その側面７ｃ，７ｄとボール４との間には軸方向のポケット隙間ｂが設けられている。   On the other hand, the pair of side surfaces 7c and 7d opposed to each other in the cage axial direction of the pocket 7 are arc surfaces having a radius of curvature larger than the radius of the ball 4, and between the side surfaces 7c and 7d and the ball 4 there is an axial direction. A pocket gap b is provided.

外輪１とボール４の接触部および内輪２とボール４の接触部は、外輪１と内輪２間に封入されるグリースによって潤滑される。   The contact portion between the outer ring 1 and the ball 4 and the contact portion between the inner ring 2 and the ball 4 are lubricated by grease sealed between the outer ring 1 and the inner ring 2.

上記のように、ポケット７の保持器周方向で対向する一対の端面７ａ，７ｂを平面とすることによって、軸受回転時に保持器３がポケット隙間ｂだけ軸方向に変位したとしても、ボール４から保持器３に負荷される荷重の方向は、図２(II)の矢印(ハ)で示すように保持器周方向の一方向のみとされる。   As described above, even when the cage 3 is displaced in the axial direction by the pocket gap b during the rotation of the bearing, the pair of end surfaces 7a and 7b opposed to each other in the circumferential direction of the cage 7 of the pocket 7 are flat. The direction of the load applied to the cage 3 is only one direction in the circumferential direction of the cage as shown by the arrow (c) in FIG.

その結果、保持器３の挙動が安定し、保持器３とその案内面である外輪内径面間で良好な潤滑状態が保持されることになり、異音を発生させるようなことは無い。   As a result, the behavior of the cage 3 is stabilized, and a good lubrication state is maintained between the cage 3 and the inner surface of the outer ring that is the guide surface thereof, and no abnormal noise is generated.

実施の形態では、ポケット７の保持器軸方向で対向する一対の側面７ｃ，７ｄを円弧面としたが、互いに平行する平面としてもよい。一対の側面７ｃ，７ｄを円弧面とすることによって、ポケット７の保持器周方向で対向する一対の端面７ａ，７ｂの保持器軸方向の幅寸法を短くすることができ、逆に、保持器３の軸方向両側の環状部ではポケットの周方向の前後両側部での幅寸法を大きくとることができるため、強度的に強い保持器３を得ることができる。   In the embodiment, the pair of side surfaces 7c and 7d facing each other in the cage axial direction of the pocket 7 are arcuate surfaces, but they may be planes parallel to each other. By making the pair of side surfaces 7c and 7d arcuate surfaces, the width dimension in the cage axial direction of the pair of end surfaces 7a and 7b opposed to each other in the circumferential direction of the cage of the pocket 7 can be shortened. In the annular portions on both sides in the axial direction of 3, the width dimension at the front and rear side portions in the circumferential direction of the pocket can be made large, so that a strong cage 3 can be obtained.

また、実施の形態では、保持器３を外輪案内としたが、内輪案内としてもよい。 In the embodiment, the cage 3 is an outer ring guide, but may be an inner ring guide.

この発明に係るアンギュラ玉軸受の実施の形態を示す断面図Sectional drawing which shows embodiment of the angular ball bearing which concerns on this invention (Ｉ)は保持器に形成されたポケットの平面図、(II)は軸方向に変位した保持器にボールから荷重が負荷された状態の平面図(I) is a plan view of a pocket formed in the cage, and (II) is a plan view of a state in which a load is applied from the ball to the cage displaced in the axial direction. (Ｉ)は従来のポケットを示す平面図、(II)はボールから保持器に周方向の荷重が負荷された状態の平面図、(III)は軸方向に変位した保持器にボールから荷重が負荷された状態を示す平面図(I) is a plan view showing a conventional pocket, (II) is a plan view in a state where a circumferential load is applied from the ball to the cage, and (III) is a load from the ball to the cage displaced in the axial direction. Plan view showing the loaded state

符号の説明Explanation of symbols

１ 外輪
２ 内輪
３ 保持器
４ ボール
７ ポケット
７ａ 端面
７ｂ 端面 1 outer ring 2 inner ring 3 cage 4 ball 7 pocket 7a end face 7b end face

Claims (2)

ボール組込み用の複数のポケットが周方向に間隔をおいて形成された軌道輪案内されるアンギュラ玉軸受用の合成樹脂製保持器において、
前記ポケットの保持器周方向で対向する一対の端面を、ボールの中心および軸受中心線を含む仮想平面に平行する平面としたことを特徴とするアンギュラ玉軸受用の合成樹脂製保持器。 In a synthetic resin cage for an angular ball bearing that is guided by a bearing ring in which a plurality of pockets for ball assembly are formed at intervals in the circumferential direction,
A synthetic resin cage for an angular ball bearing, wherein a pair of end faces opposed in the circumferential direction of the cage of the pocket are planes parallel to a virtual plane including a center of the ball and a bearing center line. 外輪と内輪間に、軌道輪案内される合成樹脂製の保持器を組込み、その保持器に形成された複数のポケットのそれぞれ内部にボールを組込んだアンギュラ玉軸受において、
前記ポケットの保持器周方向で対向する一対の端面を、ボールの中心および軸受中心線を含む仮想平面に平行する平面としたことを特徴とするアンギュラ玉軸受。 In an angular contact ball bearing in which a synthetic resin cage guided by a raceway is incorporated between an outer ring and an inner ring, and a ball is incorporated in each of a plurality of pockets formed in the cage,
An angular contact ball bearing characterized in that a pair of end faces opposed to each other in the circumferential direction of the cage of the pocket are planes parallel to a virtual plane including a center of the ball and a bearing center line.
JP2005366263A 2005-12-20 2005-12-20 Retainer made of synthetic resin for angular ball bearing, and angular ball bearing Pending JP2007170470A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009293704A (en) * 2008-06-05 2009-12-17 Jtekt Corp Rolling bearing
WO2013081076A1 (en) * 2011-11-29 2013-06-06 日本精工株式会社 Retainer and rolling bearing
WO2017088862A2 (en) 2015-11-25 2017-06-01 Schaeffler Technologies AG & Co. KG Ball bearing cage

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009293704A (en) * 2008-06-05 2009-12-17 Jtekt Corp Rolling bearing
WO2013081076A1 (en) * 2011-11-29 2013-06-06 日本精工株式会社 Retainer and rolling bearing
JP2013137099A (en) * 2011-11-29 2013-07-11 Nsk Ltd Retainer and rolling bearing
US8985859B2 (en) 2011-11-29 2015-03-24 Nsk Ltd. Cage and rolling bearing
WO2017088862A2 (en) 2015-11-25 2017-06-01 Schaeffler Technologies AG & Co. KG Ball bearing cage
DE102015223255A1 (en) 2015-11-25 2017-06-01 Schaeffler Technologies AG & Co. KG A ball bearing retainer
US10451112B2 (en) 2015-11-25 2019-10-22 Schaeffler Technologies AG & Co. KG Ball bearing cage

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