JP2008115931A - Thrust roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thrust roller bearing which prevents rollers from dropping out of pockets so that inclinations of the rollers facing a bore-side circular wall are controlled. <P>SOLUTION: A retainer 11 is provide with an outer diameter side circular wall 12, a bore-side circular wall 13, a plurality of pillar sections 15, pockets 20, and pulling-out preventive sections 17 and 19. Rollers 10, are rotatably retained in respective pockets 20 while the rollers are respectively locked in the pockets 20 by the pulling-out preventive sections 17 and 19. Inclinations of the rollers 10 are restrained by the bore-side circular wall 13 so that a distance B between the outer peripheral surface of the bore-side circular wall 13, and a bore-side end face 22 of the pocket 20, is set up to be smaller than the distance A between the inner peripheral surface of the outer diameter side circular wall 12 and the outer diameter side end face 21 of the pocket. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a thrust roller bearing.

Conventionally, as shown in FIGS. 5 and 6, a retainer 111 of a thrust roller bearing (for example, a thrust needle roller bearing) includes an outer diameter side annular wall 112, an inner diameter side annular wall 113, and both the annular walls 112. , 113 are formed in a substantially M-shaped cross section with a plurality of column portions 115 spanned at predetermined intervals in the circumferential direction. A pocket 120 is formed between the adjacent pillars 115, and retaining protrusions 117, 119 are formed in the pocket 120 from the radial intermediate part and both radial ends of the opposing surfaces of the adjacent pillars 115. Each is protruding.
Further, on a line L ′ connecting the center of the cage 111 and the center line of the pocket 120, a distance dimension A ′ between the inner peripheral surface of the outer diameter side annular wall 112 and the outer diameter side end surface 121 of the pocket 120, The distance dimension B ′ between the outer peripheral surface of the inner diameter side annular wall 113 and the inner diameter side end surface 122 of the pocket 120 is set to the same size, and the rollers (for example, needle rollers) 110 are prevented from being removed in each pocket 120. The thing of the structure hold | maintained so that rotation in the state latched by the protrusions 117 and 119 is known.
Further, this type of thrust roller bearing is disclosed in, for example, Patent Document 1.
JP 2006-170369 A

Incidentally, as shown in FIGS. 5 and 6, on the line L ′ connecting the center of the cage 111 and the center line of the pocket 120, the inner peripheral surface of the outer diameter side annular wall 112 and the outer diameter side end surface 121 of the pocket 120. In the conventional thrust roller bearing in which the distance dimension A ′ between the inner peripheral side wall 113 and the distance dimension B ′ between the outer peripheral surface of the inner diameter side annular wall 113 and the inner diameter side end face 122 of the pocket 120 is set to the same size. Further, both circumferential edges 122a of the inner diameter side end surface 122 of the pocket 120 slightly move away from the outer circumferential surface of the inner diameter side annular wall 113, while both circumferential edges 121a of the outer diameter side end face 121 of the pocket 120 are annular on the outer diameter side. The inner surface of the wall 112 is slightly approached.
In other words, the peripheral edge of the inner diameter side end surface 110 a of the roller 110 held in the pocket 120 is moved away from the outer peripheral surface of the inner diameter side annular wall 113, and the peripheral edge of the outer diameter side end face 110 b of the roller 110 is the inner periphery of the outer diameter side annular wall 112. Approach the surface.
For this reason, for example, in a state where the retaining projection 117 at the radial intermediate portion of the column portion 115 of the cage 111 is on the lower side and the retaining projection 119 on both ends in the radial direction is on the upper side, the inner diameter side end surface 110a of the roller 110 is. It becomes easy to incline in the direction which makes diagonally downward.
For this reason, when the rollers 110 are held in the respective pockets 120 of the cage 111, when the cage 111 is transported or a thrust roller bearing is assembled, an external force is applied to the rollers 110 as shown in FIG. The inner end surface 110a of the roller 110 may incline in a direction that is inclined downward. In this case, if the external force acting on the roller 110 is large, the roller 110 may be excessively inclined against the engaging force of the retaining protrusion 117 at the radial intermediate portion, and may accidentally fall out of the pocket 120.

  In view of the above problems, an object of the present invention is to provide a thrust roller bearing capable of preventing a problem that a roller falls from a pocket by regulating the inclination of the roller.

In order to achieve the above object, a thrust roller bearing according to a first aspect of the present invention spans an outer diameter side annular wall, an inner diameter side annular wall, and a circumferential distance between both the annular walls at a predetermined interval. A plurality of pillars, a pocket formed between the adjacent pillars, and a retaining protrusion that projects from the opposing surface of the adjacent pillars into the pocket. A thrust roller bearing that is rotatably held in a state in which the rollers are locked by the retaining protrusions in the respective pockets,
The distance dimension between the outer peripheral surface of the inner diameter side annular wall and the inner diameter side end face of the pocket is set smaller than the distance dimension between the inner peripheral surface of the outer diameter side annular wall and the outer diameter side end face of the pocket. In this way, the inclination of the roller is restricted by the inner diameter side annular wall.

  According to the above configuration, when the rollers are held in the respective pockets of the cage, when the cage is transported or the thrust roller bearing is assembled, when the roller is tilted by an external force, the inner diameter of the roller Since the peripheral edge of the side end surface hits the outer peripheral surface of the inner diameter side annular wall, it is possible to regulate the inclination of the roller beyond this. For this reason, it is possible to satisfactorily prevent a problem that the rollers are excessively inclined and accidentally fall off from the pocket.

  Next, the best mode for carrying out the present invention will be described with reference to examples.

(Example 1)
A first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a state in which a thrust roller bearing according to Embodiment 1 of the present invention is assembled to a swash plate type compressor. FIG. 2 is an enlarged sectional view showing the cage. FIG. 3 is a plan view showing a pocket of the cage. FIG. 4 is a perspective view showing a part of the cage in a broken state.

As shown in FIG. 1, a swash plate compressor 1 has a single piston 4 assembled over two cylinders 2 and 3 that are coupled in an axially separable manner, and the bosses of these two cylinders 2 and 3. A shaft 5 having a swash plate 6 connected to the portions 2a and 3a so as to be able to transmit torque is rotatably supported. Then, with the swash plate 6 and the piston 4 engaged, the piston 4 is reciprocated by rotating the swash plate 6 together with the shaft 5 in a predetermined direction.
Two thrust roller bearings (thrust needle roller bearings) 7 are disposed between the boss portions 2a and 3a of the two cylinders 2 and 3 and the boss portion 6a of the swash plate 6, respectively.

  The thrust roller bearing 7 is a pair of bearing rings disposed opposite to the end surfaces of the boss portions 2a (or 3a) of the two cylinders 2 and 3 and the end surfaces of the boss portions 6a of the swash plate 6 facing the end surfaces. 8, 9, a plurality of rollers (needle rollers) 10 interposed between the pair of raceways 8, 9, and a retainer 11 that holds the rollers 10 at a predetermined interval in the circumferential direction. It is configured with.

As shown in FIGS. 2 to 4, the retainer 11 is stretched over the outer diameter side annular wall 12, the inner diameter side annular wall 13, and the circumferential direction of both the annular walls 12, 13 at a predetermined interval. A plurality of pillar portions 15 are provided, and the cross section is substantially M-shaped.
Further, a pocket 20 is formed between the adjacent column portions 15, and a retaining protrusion 17 that protrudes in an opposing manner toward the inside of the pocket 20 is formed at the radial intermediate portion of the opposing surfaces of the adjacent column portions 15. Removable protrusions 19 that protrude from the pockets 20 are protruded from both ends in the radial direction of the opposing surfaces of the adjacent column portions 15.

The rollers 10 are rotatably incorporated in the pockets 20 of the cage 11 while being locked by the retaining protrusions 17 and 19. In the state where the roller 10 is assembled in the pocket 20, the roller 10 is prevented from slipping out in one axial direction from the pocket 20 by the retaining protrusion 17 at the radial intermediate portion, and the roller 20 from the pocket 20 toward the other axial direction. 10 is prevented by the protruding protrusions 19 at both ends in the radial direction.
Further, the cage 11 configured as described above is integrally formed by pressing a steel plate, and simultaneously with this pressing or after pressing, each pocket 20 is punched and simultaneously with each retaining protrusion 17, 19 is formed.

As shown in FIGS. 2 and 3, on the line L connecting the center of the retainer 11 and the center line of the pocket 20, it is between the inner peripheral surface of the outer diameter side annular wall 12 and the outer diameter side end surface 21 of the pocket 20. The distance dimension B between the outer peripheral surface of the inner diameter side annular wall 13 and the inner diameter side end face 22 of the pocket 20 is set smaller than the distance dimension A. Thus, the inclination of the roller 10 is regulated by the inner diameter side annular wall 13.
In Example 1, for example, when the diameter of the inner peripheral surface of the outer diameter side annular wall 12 is 32.8 mm and the diameter of the outer peripheral surface of the inner diameter side annular wall 13 is 21.1 mm, the distance The dimension A is set to 0.3 mm, and the distance dimension B is set to 0.2 mm. The distance dimension A is set smaller than the distance dimension A by 0.1 mm.
5-7, the diameter of the inner peripheral surface of the outer diameter side annular wall 112 is 32.8 mm, and the diameter of the outer peripheral surface of the inner diameter side annular wall 113 is 21.1 mm. The distance dimension A ′ and the distance dimension B ′ are both set to 0.3 mm.

The thrust roller bearing according to the first embodiment is configured as described above.
Therefore, when the rollers 10 are held in the respective pockets 20 of the cage 11, the rollers of the cage 11 are transported when the cage 11 is transported or when the thrust roller bearing 7 is assembled to the swash plate compressor 1. When the external force acts on 10 and tilts, the tilt of the roller 10 is regulated by the inner diameter side annular wall 13.
For example, in the state where the retaining projection 17 at the radial intermediate portion of the column portion 15 of the cage 11 is on the lower side and the retaining projections 19 on both ends in the radial direction are on the upper side, an external force acts on the roller 10 and the roller 10 When the inner diameter side end face 10a is inclined obliquely downward, the peripheral edge of the inner diameter side end face 10a of the roller 10 hits the outer peripheral face of the inner diameter side annular wall 13, and the inclination of the roller 10 beyond this is restricted.
In this way, by restricting the inclination of the roller 10, it is possible to prevent the roller 10 from being excessively inclined against the engaging force of the retaining protrusion 17 at the radial intermediate portion. As a result, it is possible to satisfactorily prevent a problem that the roller 10 is unexpectedly dropped from the pocket 20 and to improve the assembling property.

The present invention is not limited to the first embodiment.
For example, in the first embodiment, the case where the thrust roller bearing is used in a swash plate compressor is illustrated, but it can be used as a bearing for various rotating bodies that receive a thrust load.

It is a longitudinal cross-sectional view which shows the state by which the thrust roller bearing which concerns on Example 1 of this invention was assembled | attached to the swash plate type compressor. It is sectional drawing which similarly shows a holder | retainer. It is a top view which similarly shows the pocket of a holder | retainer. It is a perspective view which fractures | ruptures and shows a part of cage similarly. It is sectional drawing which shows the conventional holder | retainer. It is a top view which similarly shows the pocket of a holder | retainer. It is explanatory drawing which shows the state in which the roller similarly hold | maintained at the pocket of the holder | retainer inclined.

Explanation of symbols

7 Thrust roller bearings 8 and 9 Bearing ring 10 Roller 11 Cage 12 Outer diameter side annular wall 13 Inner diameter side annular wall 15 Column part 17, 19 Stop projection 20 Pocket 21 Outer diameter side end face 22 Inner diameter side end face

Claims (1)

An outer-diameter-side annular wall, an inner-diameter-side annular wall, a plurality of pillar portions spanned at predetermined intervals in the circumferential direction of both annular walls, and a pocket formed between the adjacent pillar portions, A retaining protrusion that protrudes into the pocket from the opposing surface of the adjacent column part, and a cage is configured, and a roller is locked in the pocket by the retaining protrusion A thrust roller bearing rotatably held by
The distance dimension between the outer peripheral surface of the inner diameter side annular wall and the inner diameter side end face of the pocket is set smaller than the distance dimension between the inner peripheral surface of the outer diameter side annular wall and the outer diameter side end face of the pocket. Thus, the thrust roller bearing is configured to restrict the inclination of the roller by the inner diameter side annular wall.

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