JP2018155363A - Angular contact ball bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce vibration in an axis direction of a holder without using a complicated shape, in an angular contact ball bearing employing an outer ring guide or inner ring guide system.SOLUTION: An bearing ring guide type angular contact ball bearing 10 is configured such that at a shoulder part of a raceway groove 12 of an outer ring 11, a holder guide surface 11a contacting with an outer diameter surface of a holder 16 is provided, wherein the holder guide surface 11a of the outer ring 11 is an inclination surface inclined toward a groove bottom of the raceway groove 12, and on both sides in an axis direction of the outer diameter surface of the holder 16, an inclination part 16a contacting with the inclination surface of the holder guide surface 11a of the outer ring 11 is provided.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an angular ball bearing that is applied to a use requiring high speed, such as a spindle for a machine tool.

  Angular contact ball bearings have a certain angle (contact angle) between the contact points of the ball and the inner ring / outer ring, so that a radial load and an axial load in one direction can be applied.

  This angular ball bearing includes an outer ring 1 having a raceway groove 2 on an inner diameter surface, an inner ring 3 having a raceway groove 4 on an outer diameter surface, and a raceway groove 2 of the outer ring 1 and a raceway groove 4 of the inner ring 3. It consists of a plurality of balls 5 which are arranged so as to be able to roll with a contact angle, and a cage 6 having a plurality of pockets for holding the plurality of balls, respectively (Patent Documents 1 and 2).

  The cage 6 works to separate the balls 5 at equal intervals so as not to contact each other, to keep the balls 5 from falling off the races (the inner ring 3 and the outer ring 1), and to rotate the balls 5. The rolling element guide shown in FIG. 4, the outer ring guide shown in FIG. 5, and the outer ring guide shown in FIG. 6 are provided depending on how to provide a guide clearance between the shoulder portion of the bearing ring and the cage 6. There are three types of inner ring guidance shown in FIG.

  As shown in FIG. 5, the outer ring guide is a method of rotating the cage 6 by bringing the outer diameter surface of the cage 6 into contact with the shoulder of the outer ring 1, and the inner ring guide is as shown in FIG. In this method, the cage 6 is rotated by bringing the inner diameter surface of the cage 6 into contact with the shoulder of the inner ring 3.

JP 2011-117542 A Japanese Patent Laid-Open No. 2006-118294

  Incidentally, angular ball bearings used in machine tools such as those disclosed in Patent Document 1 and Patent Document 2 have a high demand for low vibration as the machine tool speed increases.

  Accordingly, an object of the present invention is to suppress vibration in an outer ring guide or an inner ring guide type angular ball bearing by reducing the axial vibration of the cage without using a complicated shape. is there.

  In order to solve the above problems, the present invention provides an outer ring having a raceway groove on an inner diameter surface, an inner ring having a raceway groove on an outer diameter surface, and a contact between the raceway groove of the outer ring and the raceway groove of the inner ring. A plurality of balls that are arranged to roll freely with a corner, a cage having a plurality of pockets that respectively hold the plurality of balls, and a shoulder of the raceway groove of either the inner ring or the outer ring. In a bearing ring guide type angular contact ball bearing provided with a cage guide surface in contact with the outer diameter surface or inner diameter surface of the cage, the cage guide surface of the inner ring or the outer ring is inclined toward the groove bottom of the raceway groove. Inclined portions are provided on both sides in the axial direction of the outer diameter surface or inner diameter surface of the cage, and inclined portions that contact the inclined surface of the cage guide surface of the inner ring or the outer ring are provided.

  As described above, according to the present invention, when the inclined portion of the cage contacts the inclined surface of the cage guide surface of the outer ring or the inner ring, the inclined portion of the cage and the inclined surface of the cage guide surface of the outer ring or the inner ring are Since each track groove is inclined toward the axial center, the cage is guided toward the axial center, and the axial deflection of the cage can be reduced.

It is a longitudinal front view which expands and shows a part of angular contact ball bearing which concerns on embodiment of this invention. It is an enlarged view which shows the guide part of the holder | retainer of FIG. It is a longitudinal front view which expands and shows a part of angular ball bearing which concerns on other embodiment of this invention. It is a partial front view of a rolling element guide holder. It is a partial front view of an outer ring guide retainer. It is a partial front view of an inner ring guide holder.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

(First embodiment)
An angular ball bearing 10 of the embodiment shown in FIG. 1 includes an outer ring 11 having a raceway groove 12 on an inner diameter surface, an inner ring 13 having a raceway groove 14 on an outer diameter surface, a raceway groove 12 of the outer ring 11, and an inner ring 13. A plurality of balls 15 which are arranged to freely roll with a contact angle α between the raceway grooves 14, a cage 16 having a plurality of pockets for holding the plurality of balls 15, an inner ring 13 and an outer ring 11. The cage guide is provided at both end portions of the inner ring 13 and seals 17 that closes the bearing space between the inner ring 13 and the outer ring 11, and contacts the outer diameter surface of the cage 16 on the shoulder of the raceway groove 12 of the outer ring 11. This is an outer ring guide system provided with a surface 11a.

  On the inner diameter surface of the outer ring 11, a raceway groove 12 is formed at the center in the axial direction, and shoulder portions constituting the cage guide surface 11a are formed on both sides of the raceway groove 12. Further, seal fitting grooves 18 of the seal 17 are formed at both ends of the inner diameter surface of the outer ring 11.

  On the outer diameter surface of the inner ring 13, a raceway groove 14 is formed in the center in the axial direction, and the counterbore becomes smaller toward the end surface on one side (left side in FIG. 1) in the axial direction with respect to the raceway groove 14. 19 is provided. Further, on the other side (right side in FIG. 1) in the axial direction with respect to the raceway groove 14 on the outer diameter surface of the inner ring 13, a shoulder portion 13a and a seal groove 13b that is recessed radially inward at the end portion are provided. A labyrinth seal is formed by the seal groove 13 b and the inner edge of the seal 17. A labyrinth seal is also formed between the end of the counterbore 19 and the inner edge of the seal 17.

  The cage guide surface 11 a provided on the shoulder of the outer ring 11 has an inclined surface that is inclined toward the groove bottom of the raceway groove 12, that is, the outer diameter gradually increases toward the axial center of the raceway groove 12. It has an inclined surface.

  In addition, both sides of the outer diameter surface of the cage 16 facing the cage guide surface 11a of the shoulder portion of the outer ring 11 are inclined at the same inclination angle β as the inclination angle β of the inclined surface of the cage guide surface 11a of the shoulder portion of the outer ring 11. It is formed in the inclined portion 16a of β.

  That is, the inclined portions 16a on both sides of the outer diameter surface of the cage 16 are inclined so that the outer diameter increases from both sides toward the center in the axial direction.

  The axial length a of the inclined portion 16a provided on both sides of the outer diameter surface of the cage 16 is formed to be shorter than the length of the cage guide surface 11a of the shoulder portion of the outer ring 11, and the outer diameter surface of the cage 16 is formed. Between the inclined portion 16a and the inclined portion 16a on both sides, a straight surface 16b (length b) parallel to the axial direction is formed.

  In the case of the outer ring guide, the cage 16 cannot be incorporated into the inner diameter of the outer ring 11 unless the maximum outer diameter of the cage 16 is smaller than the minimum inner diameter of the outer ring 11. In order to satisfy this condition, it is necessary to loosen the inclination angles of the inclined portions 16a on both sides of the outer diameter surface of the cage 16, or to provide a straight surface 16b parallel to the axial direction at the center of the cage 16. By providing the straight surface 16b parallel to the axial direction at the center of the cage 16, the inclination angle of the inclined portions 16a on both sides of the outer diameter surface of the cage 16 can be increased, and the axial direction of the cage 16 described later The effect of suppressing the fluctuation of the image becomes greater.

  Further, the inner end portion in the axial direction of the inclined portion 16a of the cage 16 is positioned outside the inner end portion in the axial direction of the cage guide surface 11a, and the cage 16 rotates as shown in FIG. When the inclined portion 16 a of the retainer 16 comes into contact with the inclined surface of the retainer guide surface 11 a on the shoulder of the outer ring 11 when guided by the outer ring 11, lubricating oil is applied to the inner end of the inclined portion 16 a of the retainer 16. A holding space (shown by hatching) is formed.

  As described above, the cage 16 of the angular ball bearing 10 of the embodiment shown in FIG. 1 is an outer ring guide system, and the minimum value of the guide clearance between the outer diameter surface of the cage 16 and the shoulder of the outer ring 11 is It is set larger than the maximum value of the pocket clearance of the cage 16.

  When the inclined portion 16a of the cage 16 comes into contact with the inclined surface of the cage guide surface 11a on the inner diameter surface of the outer ring 11, the inclined surface of the cage 16 and the cage guide surface 11a on the inner diameter surface of the outer ring 11 are provided. Are inclined toward the center in the axial direction of the raceway groove 12 of the outer ring 11, the cage 16 is guided toward the center in the axial direction, and the axial deflection of the cage 16 is reduced.

  The cage 16 can be formed of, for example, a synthetic resin using a polyamide resin as a base resin. In addition, the kind of polyamide resin is not restrict | limited, Other synthetic resins, such as a polyacetal resin, polyetheretherketone, a polyimide, may be used besides polyamide. Furthermore, glass fiber, carbon fiber, aramid fiber, or the like is added to the base resin as a reinforcing material. The cage 16 can be manufactured by injection molding or cutting.

  An outer diameter portion of the seal 17 is fitted in each of the pair of seal fitting grooves 18 formed in the outer ring 11. The seal 17 includes a metal core 17a and a rubber portion 17b formed integrally with the metal core 17a.

  The metal core 17a is made of metal and has an annular shape when viewed from the axial direction. The radially outer end of the cored bar 17a is bent toward the inner side in the axial direction. The radially outer end of the cored bar 17a faces the seal fitting groove 18 in the axial direction.

  The rubber portion 17b is annular when viewed from the axial direction. The rubber portion 17b is made of rubber having excellent oil resistance and heat resistance, such as nitrile rubber, heat-resistant nitrile rubber, hydrogenated nitrile rubber, acrylic rubber, and fluorine rubber. The rubber portion 17b is integrally formed by vulcanization molding on the core metal 17a.

(Second Embodiment)
The angular ball bearing 20 of the embodiment shown in FIG. 3 is an open type without a seal, an outer ring 21 having a raceway groove 22 on an inner diameter surface, an inner ring 23 having a raceway groove 24 on an outer diameter surface, and the outer ring 21. A plurality of balls 25 which are arranged to freely roll with a contact angle α between the raceway groove 22 of the inner ring 23 and the raceway groove 24 of the inner ring 23, and a holder having a plurality of pockets for holding the plurality of balls 25, respectively. This is an inner ring guide system in which a cage guide surface 23 a that contacts the inner diameter surface of the cage 26 is provided on the shoulder of the raceway groove 24 of the inner ring 23.

  On the inner diameter surface of the outer ring 21, a raceway groove 22 is formed in the center in the axial direction, and the counterbore 27 has an outer diameter that increases toward the end surface on one side (right side in FIG. 3) in the axial direction with respect to the raceway groove 22. Is provided.

  On the outer diameter surface of the inner ring 23, a raceway groove 24 is formed at the center in the axial direction, and shoulder portions are formed on both sides of the raceway groove 24.

  The cage guide surface 23a on the shoulder of the inner ring 23 is an inclined surface inclined toward the groove bottom of the raceway groove 24, that is, an inclined surface whose outer diameter gradually decreases toward the axial center of the raceway groove 24. It has become.

  Further, on both sides of the inner diameter surface of the cage 26 facing the cage guide surface 23a of the shoulder portion of the inner ring 23, the same tilt angle as the tilt angle β of the inclined surface of the cage guide surface 23a of the shoulder portion of the inner ring 23 is provided. An inclined portion 26a having β is formed.

  That is, the inclined portions 26a on both sides of the inner diameter surface of the cage 26 are formed as inclined surfaces whose outer diameter decreases from both sides toward the center in the axial direction.

  The axial length a of the inclined portion 26 a provided on both sides of the inner diameter surface of the cage 26 is shorter than the length of the cage guide surface 23 a of the shoulder portion of the inner ring 23, and both sides of the inner diameter surface of the cage 26 are formed. Between the inclined portions 26a, a straight surface 26b (length d) parallel to the axial direction is formed.

  As described above, the cage 26 of the angular ball bearing 20 of the embodiment shown in FIG. 3 is an inner ring guide system, and the minimum value of the guide clearance between the inner diameter surface of the cage 26 and the shoulder portion of the inner ring 23 is maintained. It is set to be larger than the maximum value of the pocket clearance of the container 26.

  When the inclined portion 26a of the retainer 26 comes into contact with the inclined surface of the retainer guide surface 23a on the outer diameter surface of the inner ring 23, the inclined portion 26a of the retainer 26 and the retainer guide surface 23a on the outer diameter surface of the inner ring 23. The inclined surfaces of the inner ring 23 are inclined toward the axial center of the raceway groove 24 of the inner ring 23, so that the cage 26 is guided toward the axial center, and the axial deflection of the cage 26 is reduced. Is done.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

10, 20: Angular contact ball bearings 11, 21: Outer rings 11a, 23a: Cage guide surfaces 12, 22: Track grooves 13, 23: Inner ring 13a: Shoulders 13b: Seal grooves 14, 24: Track grooves 15, 25: Balls 16, 26: Cages 16a, 26a: Inclined portions 16b, 26b: Straight surface 17: Seal 17a: Core 17b: Rubber part 18: Seal fitting grooves 19, 27: Counter bore

Claims (7)

  An outer ring having a raceway groove on the inner diameter surface, an inner ring having a raceway groove on the outer diameter surface, and a plurality of rolls arranged so as to be rotatable with a contact angle between the raceway groove of the outer ring and the raceway groove of the inner ring. A cage having a plurality of balls, a plurality of pockets for holding the plurality of balls, and a cage in contact with an outer diameter surface or an inner diameter surface of the cage at a shoulder portion of one of the raceway grooves of the inner ring or the outer ring. In the bearing ring type angular contact ball bearing provided with a guide surface, the cage guide surface of the inner ring or the outer ring is an inclined surface inclined toward the groove bottom of the raceway groove, and the outer diameter or inner diameter of the cage A bearing ring-guided angular ball bearing, characterized in that inclined portions that contact the inclined surfaces of the cage guide surfaces of the inner ring or the outer ring are provided on both sides in the axial direction of the surface.   The bearing ring-type angular contact ball bearing according to claim 1, wherein the guide surface is formed on an inner diameter surface of the outer ring, and the inclined portions are provided on both axial sides of the outer diameter surface of the cage. .   2. The bearing ring-type angular contact ball bearing according to claim 1, wherein the guide surface is formed on an outer diameter surface of the inner ring, and the inclined portions are provided on both axial sides of the inner diameter surface of the cage. .   The minimum guide clearance between the outer ring or inner ring cage guide surface and the outer diameter or inner diameter of the cage is larger than the maximum pocket clearance between the cage pocket and the ball. The angular ring ball bearing of the bearing ring guide type according to any one of claims 1 to 3.   The axially inner end portion of the inclined portion of the cage that contacts the cage guide surface is located outside the axially inner end portion of the cage guide surface. 4. The bearing ring-type angular contact ball bearing according to claim 4.   The angular contact ball bearing type angular contact ball bearing according to any one of claims 1 to 5, wherein the inclination angle of the cage guide surface and the inclination angle of the inclined portion of the cage are the same angle.   The bearing ring guide type according to any one of claims 1 to 6, wherein an axially central portion of an outer diameter surface or an inner diameter surface of the cage provided with the inclined portion is formed as a flat straight surface. Angular contact ball bearings.

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