JP2010101443A - Thrust roller bearing of swash plate type compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thrust roller bearing of a swash plate type compressor, capable of improving abrasion resistance and seize resistance by suppressing the running out of an oil film on the outer peripheral surface of a roller caused by contact between a column part and an inclining connection part of a retainer. <P>SOLUTION: The thrust roller bearing is arranged between end surfaces of boss parts 50, 55 of a cylinder and an end surface of a boss part 61 of a swash plate 60 in the swash plate type compressor. The bearing includes the retainer 20 comprising both circular parts 21, 22 on the inner/outer diameter sides and the column part 24 which forms a pocket 23 for connecting the both circular parts 21, 22 and holding a plurality of rollers 11 to be able to roll and forming an M-shaped cross section. The column part 24 of the retainer 20 includes a radial intermediate part 25, radial both side parts 26, and the inclining connection parts 27. Inclining grooves 30, having inclined bottom surfaces 31 recessed in the circumferential direction and gradually deepened from the radial both side parts 26 sides toward the radial intermediate part 25 side, are formed on the end surfaces of the inclining connection parts 27 of the column part 24. Thereby contact to the rollers 11 is avoided. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a thrust roller bearing for a swash plate compressor.

Conventionally, a thrust roller bearing disposed at a rotating portion of a swash plate compressor is disclosed in Patent Document 1, for example.
A thrust roller bearing of this type of swash plate compressor has both annular portions on the inner and outer diameter sides, and column portions that define a pocket that connects these annular portions and holds a plurality of rollers in a rollable manner. It has a cage.
And the pillar part of a cage | basket has a radial direction intermediate part, radial direction both sides, and the inclination connection part which connects these radial direction intermediate parts and radial direction both sides.
JP 2000-213546 A

  By the way, the thrust roller bearing of the swash plate compressor is assembled, for example, between the boss portion end surfaces of both the first and second cylinders and the boss portion end surface of the swash plate via both race rings. An axial load is applied. As a result, both raceways bend in a conical shape, and in the cage assembled between these raceways, the rollers can easily come into contact with the end surfaces of the inclined connecting portions of the column portions, resulting in oil film breakage on the roller surfaces. There is a fear.

  In view of the above problems, the object of the present invention is to improve wear resistance and seizure resistance by suppressing oil film breakage on the outer peripheral surface of the roller due to contact with the inclined connecting portion of the column portion of the cage during bearing rotation. It is an object of the present invention to provide a thrust roller bearing for a swash plate compressor capable of achieving the above.

In order to achieve the above object, a thrust roller bearing for a swash plate compressor according to claim 1 of the present invention is a thrust roller bearing disposed at a rotating portion of a swash plate compressor,
A cage having both annular portions on the inner and outer diameter sides, and pillar portions that form a pocket that connects the annular portions and holds a plurality of rollers in a rollable manner;
The pillar portion of the retainer has a radial intermediate portion, both radial side portions, and an inclined connecting portion that connects these radial intermediate portion and both radial side portions,
An inclined groove having an inclined bottom surface that is recessed in the circumferential direction and gradually becomes deeper from the both radial side portions toward the radial intermediate portion side is formed on an end surface of the inclined coupling portion of the column portion. It is characterized by.

  According to the above configuration, during the rotation of the bearing, the inclined groove formed on the end surface of the inclined connecting portion of the column portion avoids contact with the roller. it can. As a result, the wear resistance and seizure resistance of the thrust roller bearing of the swash plate compressor can be improved satisfactorily, and the durability is excellent.

A thrust roller bearing for a swash plate compressor according to claim 2 is a thrust roller bearing for a swash plate compressor according to claim 1,
One side edge located on both sides in the radial direction of the bottom surface of the inclined groove has a rounded surface or a curved surface and is continuous with the end surface of the inclined connecting portion.

  According to the above configuration, since one side edge located on both sides in the radial direction of the bottom surface of the inclined groove continues to the end surface of the inclined connecting portion with a rounded surface or a curved surface, even if the outer peripheral surface of the roller contacts the portion Oil film breakage on the outer peripheral surface of the can be suppressed. In other words, it is possible to better prevent oil film breakage on the outer peripheral surface of the roller due to edge contact.

A thrust roller bearing for a swash plate compressor according to claim 3 is a thrust roller bearing for a swash plate compressor according to claim 1 or 2,
The inclined groove is formed at the same time as the pocket punching process.

According to the said structure, an inclination groove | channel can be easily formed in the end surface of the inclination connection part of a pillar part simultaneously with the punching process of the pocket of a holder | retainer.
In addition, even if a shearing surface and a fracture surface (rough and rough surface compared to the shearing surface) are formed on the inclined bottom surface of the inclined groove by punching, the inclined bottom surface has good contact with the rollers. To be avoided.
That is, in the conventional cage in which the inclined groove is not formed, a shear surface and a fracture surface may be formed on the end surface of the inclined coupling portion of the column portion. Although the oil film is likely to be cut off on the surface, such a problem can be satisfactorily prevented in the present invention.

  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 an explanatory view showing a state in which a thrust roller bearing is assembled to a swash plate compressor according to Embodiment 1 of the present invention. FIG. 2 is a side sectional view showing a thrust roller bearing. FIG. 3 is a perspective view showing a part of the cage broken away. FIG. 4 is a plan view showing a part of the cage. FIG. 5 is an enlarged side sectional view showing the relationship between both the annular portions on the inner and outer diameter sides of the cage and the column portions. FIG. 6 is an enlarged plan view showing a pocket of the cage. FIG. 7 is a cross-sectional view based on the line VI-VI in FIG.

As shown in FIG. 1, the thrust roller bearing (including thrust needle roller bearing) 10 of the swash plate compressor according to the first embodiment is provided on the end faces of both boss portions 50 and 55 of the first and second cylinders. Arranged between both annular rings 70 and 71 between the formed annular protrusions 51 and 56 as receiving seats and the annular protrusions 62 and 63 formed on both end surfaces of the boss 61 of the swash plate 60. Is done.
The outer diameters of the annular protrusions 51 and 56 of the boss parts 50 and 55 of the first and second cylinders are set smaller than the inner diameters of the annular protrusions 62 and 63 of the boss part 61 of the swash plate 60. Has been. Then, both the races 70 and 71 are assembled in a state of being elastically deformed and bent into a conical shape. In this state, axial loads in the directions of arrows P and Q shown in FIG. 1 are applied to the thrust roller bearing 10. It is like that.

  As is well known in the swash plate compressor, when the drive shaft 75 fitted over the center holes of the boss portions 50 and 55 of the first and second cylinders and the boss portion 61 of the swash plate 60 is rotated. The swash plate 60 is rotated integrally with the swash plate 60, and the piston is reciprocated based on the swash plate 60 (see, for example, JP-A-2005-9814).

As shown in FIG. 2, the thrust roller bearing 10 includes a plurality of rollers 11 and a cage 20.
As shown in FIGS. 3 to 5, the cage 20 is formed by pressing a steel plate, and includes an inner diameter side annular portion 21, an outer diameter side annular portion 22, and both inner and outer diameter side annular portions 21, 22 and a plurality of pillar portions 24 that divide and form pockets 23 in a circumferential direction at a predetermined interval, and have a substantially M-shaped cross section.
As shown in FIG. 5, the column portion 24 of the cage 20 includes a radial intermediate portion 25, radial side portions 26, and an inclined connection portion 27 that connects the radial intermediate portion 25 and the radial side portions 26. have.
Furthermore, each pocket 23 is formed by punching between adjacent column parts 24, and the rollers 11 are held in these pockets 23 so that they can roll.
Further, as shown in FIGS. 6 and 7, in order to prevent the rollers 11 in the pocket 23 from coming off, the end surfaces of the radial intermediate portion 25 and the radial side portions 26 of the opposing surfaces of the adjacent column portions 24 are provided on the end surfaces. The retaining claws 28 and 29 are formed so as to protrude into the pocket 23 in an opposing manner.

As shown in FIGS. 3 and 6, the end surface of the inclined connecting portion 27 of the column portion 24 of the retainer 20 is recessed in the circumferential direction and gradually increases in depth from both radial side portions toward the radial intermediate portion side. An inclined groove 30 is formed which has a bottom surface 31 and avoids contact with the roller 11.
Further, in the first embodiment, one side edge located on the both sides 26 in the radial direction of the bottom surface 31 of the inclined groove 30 is continuous with the end surface of the inclined connecting portion 27 with a rounded surface (or curved surface) 32.
In the first embodiment, the inclined groove 30 is formed simultaneously with the punching of the pocket 23 and extends in the punching direction of the pocket 23 (direction parallel to the axial direction).
Further, the inclined groove 30 is formed by punching from the both sides 26 in the radial direction of the inclined connecting portion 27 toward the intermediate portion 25 in the radial direction so as to cover the entire length of the inclined connecting portion 27, and on the both sides 26 in the radial direction. , The punching width is small and the punching width is gradually increased toward the radial intermediate portion 25 side so as to be formed on both sides of the retaining pawl 28 of the radial intermediate portion 25.

The thrust roller bearing of the swash plate compressor according to the first embodiment is configured as described above.
Therefore, as shown in FIG. 1, the annular protrusions 51 and 56 of both boss parts 50 and 55 of the first and second cylinders of the swash plate compressor, and the both annular protrusions 62 of the boss part 61 of the swash plate 60. , 63, and the thrust roller bearing 10 is disposed via both race rings 70, 71.
When the thrust roller bearing 10 rotates during operation of the swash plate compressor, contact with the roller 11 is avoided in the inclined groove 30 formed in the end face of the inclined connecting portion 27 of the column portion 24 of the cage 20. For this reason, it is possible to suppress the oil film breakage on the outer peripheral surface of the roller 11 by the amount by which the contact with the roller 11 is avoided by the inclined groove 30. As a result, the wear resistance and seizure resistance of the thrust roller bearing 10 can be improved satisfactorily and the durability is excellent.

  Further, in the first embodiment, as shown in FIG. 6, the one side edge located on the both sides 26 in the radial direction of the bottom surface 31 of the inclined groove 30 has a rounded surface (or includes a curved surface) 32 and the inclined connecting portion 27. Therefore, even if the outer peripheral surface of the roller 11 comes into contact with the rounded surface 32, the oil film breakage on the outer peripheral surface of the roller 11 can be suppressed. In other words, the oil film breakage on the outer peripheral surface of the roller 11 due to edge contact can be prevented more favorably.

Further, in this Example 1, in order to form the inclined groove 30 on the end face of the inclined connecting portion 27 of the pillar portion 24 along (in parallel with) the punching direction of the pocket 23 of the cage 20, Compared with the case where the inclined grooves 30 are formed by post-processing, the processing is easy and the processing cost can be reduced.
Further, even if a sheared surface and a fracture surface (a rough surface compared to the sheared surface) are formed on the bottom surface 31 of the inclined groove 30, the bottom surface 31 of the inclined groove 30 is in contact with the roller 11. Avoided.
That is, in the conventional cage in which the inclined groove 30 is not formed, a shearing surface and a fracture surface are formed by punching the pocket 23 on the end surface of the inclined coupling portion 27 of the column portion 24, and Although the oil film breakage of the outer peripheral surface of the roller 11 is likely to occur, the oil film breakage of the outer peripheral surface of the roller 11 can be satisfactorily suppressed by forming the inclined groove 30 as described above.

In addition, this invention is not limited to the said Example 1, In the range which does not deviate from the summary of this invention, it can implement with a various form.
For example, in the first embodiment, the inclined groove 30 is formed over almost the entire length of the inclined connecting portion 27 by being punched from the both radial side portions 26 side of the inclined connecting portion 27 toward the radially intermediate portion 25 side. However, for example, the inclined groove is formed in a portion extending from the radial direction intermediate portion 25 side of the column portion 24 of the cage 20 to a length that is approximately half the length of the inclined connecting portion 27 (a length that does not reach both radial side portions 26). Even if 30 is formed, the present invention can be implemented.
Moreover, although the inclination groove | channel 30 formed in the inclination connection part 27 of the pillar part 24 of the holder | retainer 20 showed the thing with a linear inclination, round shape, curved shape, etc. may be sufficient.

It is explanatory drawing which shows the state by which the thrust roller bearing was assembled | attached to the swash plate type compressor which concerns on Example 1 of this invention. It is side sectional drawing which similarly shows a thrust roller bearing. It is a perspective view which fractures | ruptures and shows a part of cage similarly. It is a top view which shows a part of cage similarly. It is a sectional side view which expands and similarly shows the relationship between both the annular portions on the inner and outer diameter sides of the cage and the column portion. It is a top view which similarly expands and shows the pocket of a holder | retainer. It is sectional drawing based on the VI-VI line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Thrust roller bearing 11 Roller 20 Cage 21 Inner diameter side annular part 22 Outer diameter side annular part 23 Pocket 24 Column part 25 Radial direction intermediate part 26 Radial direction both sides 27 Inclined connection part 30 Inclined groove 31 Bottom surface 32 Round surface 50 First Cylinder boss part 55 Second cylinder boss part 60 Swash plate 61 Boss part

Claims (3)

A thrust roller bearing disposed at a rotating part of a swash plate compressor,
A cage having both annular portions on the inner and outer diameter sides, and pillar portions that form a pocket that connects the annular portions and holds a plurality of rollers in a rollable manner;
The pillar portion of the retainer has a radial intermediate portion, both radial side portions, and an inclined connecting portion that connects these radial intermediate portion and both radial side portions,
An inclined groove having an inclined bottom surface that is recessed in the circumferential direction and gradually becomes deeper from the both radial side portions toward the radial intermediate portion side is formed on an end surface of the inclined coupling portion of the column portion. Thrust roller bearings for swash plate compressors. A thrust roller bearing for a swash plate compressor according to claim 1,
A thrust roller bearing for a swash plate compressor, wherein one side edge located on both sides in the radial direction of the bottom surface of the inclined groove has a rounded surface or a curved surface and is continuous with an end surface of the inclined connecting portion. A thrust roller bearing for a swash plate compressor according to claim 1 or 2,
A thrust roller bearing for a swash plate compressor, wherein the inclined groove is formed simultaneously with the punching of the pocket.

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