JP2008064280A - Rolling bearing - Google Patents

Abstract

A rolling bearing capable of suppressing torsional deformation of a cage during high-speed rotation is provided.
A rolling bearing 10 includes an outer ring 11 having an outer ring raceway surface 11a on an inner circumferential surface, an inner ring 12 having an inner ring raceway surface 12a on an outer circumferential surface, and an outer ring raceway surface 11a and an inner ring raceway surface 12a. A plurality of rolling elements 13 that are movably disposed, and a holder 14 that holds the rolling elements 13 at equal intervals in the circumferential direction. The holder 14 holds the rolling elements 13 in a rollable manner. The pocket portions 15 adjacent to each other in the circumferential direction, and a pair of claw portions 16 protruding in the axial direction at both circumferential ends of the inner peripheral surface of the pocket portion 15, and the outer circumferences of the pair of claw portions 16 A guide portion 18 with the outer ring 11 is provided on the surface.
[Selection] Figure 1

Description

  The present invention relates to a rolling bearing, and more particularly to a rolling bearing for high-speed rotation.

  As a conventional rolling bearing, a rolling bearing 50 as shown in FIG. 10 is known. In this rolling bearing 50, a plurality of balls 3 as rolling elements are disposed between an inner ring 1 and an outer ring 2. It is a deep groove ball bearing, and a plurality of balls 3 are held so as to be able to roll at substantially equal intervals in the circumferential direction via an annular crown-shaped cage 4 as shown in FIG.

  The crown-shaped cage 4 is formed by injection molding of synthetic resin or the like, and the crown-shaped cage 4 has a pocket portion 5 that holds a plurality of balls 3 so as to roll in the circumferential direction at substantially equal intervals. A pair of claw portions 6 that are formed and project in the axial direction are provided at both ends in the circumferential direction of the inner peripheral surface of the pocket portion 5. In addition, an opening 7 is formed in the pair of claws 6, and the ball 3 is pushed into the pocket 5 while expanding the pair of claws 6 from the opening 7. 3 is held so as to be able to roll through a minute gap.

  Incidentally, the crown type cage 4 incorporated in the conventional rolling bearing 50 is a rolling element guide type cage, and the opening 7 side and the cage rim side have an asymmetric cross-sectional shape in the axial direction. In response to the recent high speed rotation, as shown in FIG. 12, the centrifugal force due to the cage rotation (rolling element revolution) acts on the axial end on the opening 7 side, and the axial end on the cage rim side There is a risk that torsional deformation may occur due to elastic or plastic deformation with the portion as a torsion axis.

  And as a rolling bearing which prevents torsional deformation of the above-mentioned crown type cage, a rolling bearing in which a cored bar is attached to the side of the crown type cage on the side opposite to the pocket opening side and the axial direction (see, for example, Patent Document 1) Or a rolling bearing (for example, an outer peripheral surface of a plurality of elastic pieces formed on one axial side surface of the main part of the crown-shaped cage as an inclined surface inclined in a radially inward direction as the distance from the main part increases. In the main part of the crown type cage, a metal reinforcing ring made of a plate material having rigidity higher than that of synthetic resin, such as iron or an aluminum alloy, is coupled to the entire circumference of the main part of the crown type cage. A plurality of elastic pieces are provided on one axial surface of the main part of the rolling bearing (for example, see Patent Document 2) and the crown type cage, and the outer diameter of the outer peripheral surface on the front end side of each elastic piece is set to the main part side. While making it smaller than the outer diameter of the outer peripheral surface, Rolling bearing greater than the inner diameter of the diameter main portion side inner circumferential surface (e.g., see Patent Document 3) are known.

Japanese Utility Model Publication No. 6-8821 JP 2000-161365 A JP 2002-147463 A

  However, in the rolling bearings described in Patent Documents 1 and 2 described above, the crown type cage is reinforced with a cored bar or a reinforcing material, so that the cost may increase as compared with a conventional crown type cage. There was sex. Further, in the rolling bearings described in Patent Documents 2 and 3, the tip of the elastic piece of the crown type cage is thinned, so that there is a possibility that the rigidity is lowered as compared with the conventional crown type cage. was there.

  The present invention has been made to eliminate such inconveniences, and an object of the present invention is to provide a rolling bearing capable of suppressing torsional deformation of the cage during high-speed rotation.

The above object of the present invention can be achieved by the following constitution.
(1) An outer ring having an outer ring raceway surface on an inner peripheral surface, an inner ring having an inner ring raceway surface on an outer peripheral surface, and a plurality of rolling elements disposed so as to be freely rollable between the outer ring raceway surface and the inner ring raceway surface; A rolling bearing comprising a cage that holds the rolling elements at equal intervals in the circumferential direction, and the cage holds the rolling elements such that they can roll, and pocket portions that are adjacent to each other in the circumferential direction; A rolling bearing having a pair of claw portions protruding in the axial direction at both circumferential ends of the inner circumferential surface of the pocket portion, and providing a guide portion with an outer ring on the outer circumferential surface of the pair of claw portions. .

  According to the rolling bearing of the present invention, the cage holds the rolling element in a rollable manner, and the axially adjacent pocket portions adjacent to each other in the circumferential direction and both circumferential ends of the inner peripheral surface of the pocket portion. A pair of protruding claw portions, and a guide portion for the outer ring is provided on the outer peripheral surface of the pair of claw portions, and the axial end on the cage rim side generated on the opening side of the cage is defined as a torsion shaft. It is possible to suppress the torsional deformation of the cage due to the elastic or plastic deformation.

  Hereinafter, each embodiment of the rolling bearing according to the present invention will be described in detail with reference to the drawings.

(First embodiment)
First, with reference to FIGS. 1-6, 1st Embodiment of the rolling bearing which concerns on this invention is described.
FIG. 1 is a partially cutaway perspective view for explaining a first embodiment of a rolling bearing according to the present invention, FIG. 2 is an enlarged sectional view of a main part of the rolling bearing shown in FIG. 1, and FIG. 3 is a cage shown in FIG. FIG. 4 is an enlarged perspective view of an essential part for explaining a first modified example of the cage of the rolling bearing according to the present invention, and FIG. 5 is a diagram of the rolling in a state in which the cage of FIG. 4 is incorporated. The principal part expanded sectional view of a bearing, FIG. 6: is a principal part expanded sectional view for demonstrating the 2nd modification of the holder | retainer of the rolling bearing which concerns on this invention.

  As shown in FIGS. 1 and 2, the rolling bearing 10 of the present embodiment includes an outer ring 11 having an outer ring raceway surface 11a on an inner peripheral surface, an inner ring 12 having an inner ring raceway surface 12a on an outer peripheral surface, and an outer ring raceway surface 11a. A plurality of balls (rolling elements) 13 disposed so as to be freely rollable between the inner ring raceway surface 12a, and a crown-shaped cage (cage) 14 that holds the balls 13 at equal intervals in the circumferential direction; Is provided.

  The crown type retainer 14 is integrally formed by synthetic resin injection molding or the like. The resin material of the crown-shaped cage 14 is polyamide resin such as 46 nylon or 66 nylon, polybutylene terephthalate, polyferene sulfide (PPS), polyamideimide (PAI), thermoplastic polyimide, polyether ether ketone (PEEK). And polyether nitrile (PEN). Further, the rigidity and dimensional accuracy of the cage can be improved by appropriately adding 10 to 50% by weight of a fibrous filler (for example, glass fiber or carbon fiber) to these resins.

  As shown in FIG. 3, the crown-shaped cage 14 is formed with pockets 15 that hold a plurality of balls 13 such that they can roll in the circumferential direction at substantially equal intervals, and are adjacent to each other in the circumferential direction. A pair of claw portions 16 projecting in the axial direction are provided at both circumferential ends of the inner peripheral surface of the pocket portion 15. In addition, an opening 17 is formed between the tips of the pair of claws 16, and the ball 13 is pushed from the opening 17 into the pocket 15 while spreading the pair of claws 16. The ball 13 is held in a rollable manner through a minute gap.

  And in this embodiment, as shown in FIG. 3, it protrudes on the front-end | tip part outer peripheral surface of a pair of nail | claw part 16 of the crown type holder | retainer 14, radially outward, and opposes the inner peripheral surface of the outer ring | wheel 11. A section (guide section) 18 is provided. The protrusion 18 is set so as not to contact the inner peripheral surface of the outer ring 11 within a range of assumed thermal expansion and elastic deformation when not rotating. For example, the protrusion 18 and the outer ring 11 The gap with the inner peripheral surface is preferably about 50 μm.

  As described above, according to the rolling bearing 10 of the present embodiment, the crown type retainer 14 holds the balls 13 in a rollable manner, and the pocket portions 15 adjacent to each other in the circumferential direction, A pair of claw portions 16 projecting in the axial direction at both ends in the circumferential direction of the circumferential surface, and a protrusion 18 serving as a guide portion for the outer ring 11 is provided on the outer circumferential surface of the pair of claw portions 16. Since the mold retainer 14 is guided to the outer ring 11 by the projection 18, the crown mold is formed by elastic or plastic deformation with the axial end on the retainer rim side generated on the opening 17 side of the crown retainer 14 as a torsion axis. The torsional deformation of the cage 14 can be suppressed.

  As a first modification of the present embodiment, as shown in FIGS. 4 and 5, the crown type cage 14 is provided with an arc-shaped chamfered portion 18 a at the peripheral edge of the radial end portion of the protruding portion 18. You may do it. In this case, the grease resistance of the protrusion 18 can be reduced, and the edge of the protrusion 18 does not come into contact with the inner peripheral surface of the outer ring 11, so that the crown type retainer 14 can be smoothly guided. . In addition, the arrow A in FIG. 5 shows the flow of grease.

  As a second modification of the present embodiment, as shown in FIG. 6, the crown type cage 14 may be provided with a spherical spherical surface portion 18 b on the radial end surface of the protruding portion 18. Also in this case, the grease resistance of the protrusion 18 can be reduced, and the edge of the protrusion 18 does not contact the inner peripheral surface of the outer ring 11, so that the crown type retainer 14 can be smoothly guided. it can. In addition, the arrow B in FIG. 6 shows the flow of grease.

(Second Embodiment)
First, with reference to FIGS. 7-9, 2nd Embodiment of the rolling bearing which concerns on this invention is described. Note that portions that are the same as or equivalent to those of the first embodiment are denoted by the same reference numerals in the drawings, and description thereof is omitted or simplified.
FIG. 7 is an enlarged sectional view of a main part for explaining a second embodiment of the rolling bearing according to the present invention, FIG. 8 is a perspective view for explaining the cage shown in FIG. 7, and FIG. 9 is a holding shown in FIG. It is a principal part expansion perspective view of a vessel.

  As shown in FIG. 7, the rolling bearing 20 of the present embodiment includes an outer ring 11 having an outer ring raceway surface 11a on an inner peripheral surface, an inner ring 12 having an inner ring raceway surface 12a on an outer peripheral surface, an outer ring raceway surface 11a and an inner ring raceway. A plurality of balls 13 that are rotatably disposed between the surface 12a and a crown-shaped cage 24 that holds the balls 13 at equal intervals in the circumferential direction.

  As shown in FIGS. 8 and 9, the crown-shaped cage 24 holds a plurality of balls 13 so as to be able to roll in the circumferential direction at substantially equal intervals, and pocket portions 15 adjacent to each other in the circumferential direction are formed. A pair of claw portions 16 projecting in the axial direction are provided at both ends in the circumferential direction of the inner peripheral surface of the pocket portion 15. In addition, an opening 17 is formed between the tips of the pair of claws 16, and the ball 13 is pushed from the opening 17 into the pocket 15 while spreading the pair of claws 16. The ball 13 is held in a rollable manner through a minute gap.

  And in this embodiment, as shown in FIG. 9, it protrudes in the front-end | tip part outer peripheral surface of a pair of nail | claw part 16 of the crown type holder | retainer 14, radially outwards, and the protrusion facing the inner peripheral surface of the outer ring | wheel 11 Further, a flange portion (guide) is provided on the outer peripheral surface of the end portion of the crown type retainer 14 on the cage rim side so as to project radially outward and face the inner peripheral surface of the outer ring 11. Part) 21 is provided over the entire circumference. The protrusion 18 and the flange 20 are set so as not to come into contact with the inner peripheral surface of the outer ring 11 within a range of assumed thermal expansion and elastic deformation when not rotating. For example, the protrusion 18 The gap between the flange portion 21 and the inner peripheral surface of the outer ring 11 is preferably about 50 μm. Further, an arc-shaped chamfered portion may be provided at both end edges in the axial direction of the flange portion 21.

As described above, according to the rolling bearing 20 of the present embodiment, the crown-shaped cage 14 holds the balls 13 in a rollable manner, and the pocket portions 15 adjacent to each other in the circumferential direction, A pair of claw portions 16 projecting in the axial direction at both ends in the circumferential direction of the peripheral surface, and provided with a protrusion 18 serving as a guide portion for the outer ring 11 on the outer peripheral surface of the pair of claw portions 16 and holding Since the flange portion 21 which is a guide portion with the outer ring 11 is provided on the outer peripheral surface of the end portion on the rim side, the crown type retainer 14 is guided to the outer ring 11 by the projection portion 18 and the flange portion 21. The torsional deformation of the crown-shaped cage 14 due to the elastic or plastic deformation with the axial end on the cage rim side generated on the opening 17 side of the 14 as a torsion axis can be suppressed. The stability of the cage 14 can be improved.
About another structure and an effect, it is the same as that of the said 1st Embodiment.

1 is a partially cutaway perspective view for explaining a first embodiment of a rolling bearing according to the present invention. It is a principal part expanded sectional view of the rolling bearing shown in FIG. It is a perspective view for demonstrating the holder | retainer shown in FIG. It is a principal part expansion perspective view for demonstrating the 1st modification of the cage of the rolling bearing which concerns on this invention. It is a principal part expanded sectional view of the rolling bearing of the state incorporating the holder | retainer of FIG. It is a principal part expanded sectional view for demonstrating the 2nd modification of the cage of the rolling bearing which concerns on this invention. It is a principal part expanded sectional view for demonstrating 2nd Embodiment of the rolling bearing which concerns on this invention. It is a perspective view for demonstrating the holder | retainer shown in FIG. It is a principal part expansion perspective view of the holder | retainer shown in FIG. It is principal part sectional drawing for demonstrating the conventional rolling bearing. It is a perspective view for demonstrating the conventional crown type holder | retainer integrated in the rolling bearing shown in FIG. It is principal part sectional drawing for demonstrating the torsion deformation which arises in the conventional crown type holder | retainer.

Explanation of symbols

10, 20 Rolling bearings 11 Outer ring 11a Outer ring raceway surface 12 Inner ring 12a Inner ring raceway surface 13 Ball (rolling element)
14,24 Crown type cage (Cage)
15 Pocket 16 Claw 17 Opening 18 Projection (Guide)
18a Chamfered portion 18b Spherical surface portion 21 Flange portion (guide portion)

Claims (1)

An outer ring having an outer ring raceway surface on an inner peripheral surface, an inner ring having an inner ring raceway surface on an outer peripheral surface, and a plurality of rolling elements disposed to be freely rollable between the outer ring raceway surface and the inner ring raceway surface; A rolling bearing comprising a cage for holding the rolling elements at equal intervals in the circumferential direction,
The cage holds the rolling element in a rollable manner, a pocket portion adjacent to each other in the circumferential direction, and a pair of claw portions protruding in the axial direction at both circumferential ends of the inner circumferential surface of the pocket portion. And having
A rolling bearing characterized in that a guide portion with the outer ring is provided on an outer peripheral surface of the pair of claw portions.

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