JPH109130A - Swash plate type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a swash plate type compressor for which it is possible to apply a proper amount of preload to the swash plate without requiring a complicated adjustment. SOLUTION: The thick plate at the outer circumferential edge part 52a of the rear-side race 52 of the front-side thrust bearing 9, which makes contact with the first projection 22 of the boss part 22 of a swash plate 22 is made smaller than that at the inner circumferential edge part 52b of said race 52, and the thick plate at the outer circumferential edge part 61a of the front-side race 61 of the rear-side thrust bearing 10, which makes contact with the second projection 23 of the boss part 21 of the swash plate 20 is made smaller than that at the inner circumferential edge part 61b of said race 61. When a preload is applied to the swash plate 20, the outer circumferential edge part 52a of the rear-side race 52 of the front-side thrust bearing 9 and the outer circumferential edge part 61a of the front-side race 61 of the rear-side thrust bearing 10 are respectively elastically deformed so that an excessive preload applied to the swash plate 20 is absorbed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a swash plate type compressor.

[0002]

FIG. 3 is a longitudinal sectional view of a conventional swash plate type compressor.
FIG. 5A is a sectional view showing the drive shaft and the swash plate in FIG.
FIG. 4B is a longitudinal sectional view showing a state where a drive shaft and a swash plate are removed from the swash plate compressor of FIG. 3.

[0003] A front cylinder block 1 and a rear cylinder block 2 of a swash plate compressor are axially opposed to each other. A front head 4 is fixed to one end of the joined cylinder blocks 1 and 2 via a valve plate 3 and the like, and a rear head 6 is fixed to the other end via a valve plate 5 and the like.

A drive shaft 7 is disposed at the center of the cylinder blocks 1 and 2, and a swash plate 20 is fixed to the drive shaft 7, and the swash plate 20 is controlled by a front thrust bearing 109 and a rear thrust bearing 110. It is rotatably supported. The swash plate 20 is housed in a swash plate chamber 11 formed inside the joined cylinder blocks 1 and 2.

The cylinder blocks 1 and 2 are provided with a plurality of cylinder bores 12 (only one cylinder bore 12 is visible in FIG. 3). The cylinder bores 12 are parallel to the drive shaft 7 and are arranged at predetermined intervals in a circumferential direction around the drive shaft 7. Each cylinder bore 12
A piston 13 is slidably housed therein. In each cylinder bore 12, compression chambers 14, 15 are formed on both sides of the piston 13. The piston 13 is connected to the swash plate 20 via shoes 16 and 17.

A front boss 30 is integrally provided at the center of the cylinder block 1. The front boss 30 rotatably supports the front end of the drive shaft 7. The front boss 30 abuts the boss 21 of the swash plate 20 via the front thrust bearing 109.

A rear boss 40 is integrally provided at the center of the cylinder block 2. Rear boss 40
Supports the rear end of the drive shaft 7 rotatably. The rear boss 40 abuts the boss 21 of the swash plate 20 via the rear thrust bearing 110.

FIG. 4 is an enlarged sectional view showing a part of the swash plate type compressor shown in FIG.

The front thrust bearing 109 includes an annular front race 109a and an annular rear race 10a.
9b and a plurality of needle rollers 109c sandwiched between both races 109a and 109b.

The rear thrust bearing 110 includes an annular front race 110a and an annular rear race 110b.
And a plurality of needle rollers 110c sandwiched between both side races 110a and 110b.

The front end face 2 of the boss 21 of the swash plate 20
1a, a first projection 22 abutting against the outer peripheral edge of the rear race 109b of the front thrust bearing 109 is provided.
Are provided.

Rear end surface 21b of boss 21 of swash plate 20
The front race 1 of the rear thrust bearing 110
The second projection 23 abutting against the outer peripheral edge of the 10a
Is provided.

On the rear end face 30a of the boss portion 30 of the front cylinder block 1, a third projection 31 is provided which abuts against the inner peripheral edge of the front race 109a of the front thrust bearing 109. .

Boss 40 of rear cylinder block 2
Of the rear thrust bearing 11
A fourth protrusion 41 is provided to abut against the inner peripheral edge of the rear race 110b.

In this swash plate type compressor, the first projection 22 of the boss 21 of the swash plate 20 is connected to the front thrust bearing 109.
The third protrusion 31 of the boss 30 of the cylinder block 1 abuts against the outer peripheral edge of the rear race 109b of the front thrust bearing 109 against the inner peripheral edge of the front race 109a of the front thrust bearing 109. Is pressed against the boss 21 of the swash plate 20 to bend each of the races 109b and 109a into a curved shape.

Similarly, the second projection 23 of the boss 21 of the swash plate 20 is attached to the outer peripheral edge of the front race 110a of the rear thrust bearing 110, and the boss 4 of the cylinder block 2
No. 4 projections 41 abut against the inner peripheral edge of the rear race 110b of the rear thrust bearing 110, and in this state, the boss portion 40 is pressed against the boss portion 21 of the swash plate 20, and the respective races 110a and 110b are moved. It is bent in a curved shape.

As described above, each thrust bearing 109, 110
By applying a preload to the swash plate 20 via the swash plate, it is possible to prevent the swash plate 20 from moving in the axial direction during operation and generating abnormal noise.

[0018]

However, if the preload is too large, the contact portions between the projections 21, 22, 31, 41 and the races 109a, 109b, 110a, 110b are worn out early (axial wear). Then, an unusual noise due to the play of the swash plate 20 occurs. Therefore, each thrust bearing 1
It is necessary to give a moderate preload to the swash plate 20 via 09 and 110.

Therefore, conventionally, the front race 109a of the thrust bearing 109 and the rear thrust bearing 11
0, the axial dimension A between the races 110b (see FIG. 5);
An adjustment is made to match the axial dimension B (see FIG. 5) between the boss 30 of the cylinder block 1 and the boss 40 of the cylinder block 2.

This adjustment is performed by matching the axial thicknesses of the boss portions 30 and 40 of the cylinder blocks 1 and 2 and the boss portion 21 of the swash plate 20 and reducing the race thickness of the thrust bearings 109 and 110. This adjustment is complicated, but is complicated.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a swash plate type compressor that can apply an appropriate preload to a swash plate without complicated adjustment.

[0022]

According to a first aspect of the present invention, there is provided a swash plate compressor comprising: front and rear cylinder blocks which are joined to each other in an axial direction; A swash plate fixed to the drive shaft and housed in the cylinder block; and a swash plate between the boss of the swash plate and the boss of the front cylinder block; A thrust bearing mounted between the boss portion of the plate and the boss portion of the rear cylinder block and rotatably supporting the swash plate; and a thrust bearing provided on the boss portion of the swash plate and abutting on the thrust bearing. A swash plate type compressor having a plate-side projection and a cylinder block-side projection provided on a boss portion of each of the cylinder blocks and abutting on the thrust bearing; The thickness of the outer peripheral edge of at least one of the plate-side race and the cylinder block-side race, which is in contact with the swash plate-side projection or the cylinder block-side projection, is the inner peripheral edge of the one race. The thickness is smaller than the thickness of a portion that does not contact the swash plate side projection or the cylinder block side projection.

When a preload is applied to the swash plate, a portion of the outer peripheral edge of one or both races of the thrust bearing, which comes into contact with the swash plate side projection or the cylinder block side projection,
Since it is elastically deformed according to the load, an excessive preload applied to the swash plate is absorbed.

[0024]

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

FIG. 2 is a longitudinal sectional view of a swash plate compressor according to one embodiment of the present invention, and FIG. 1 is an enlarged sectional view showing a part of the swash plate compressor of FIG. The same parts as those of the conventional swash plate type compressor shown in FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted.

The front end face 2 of the boss 21 of the swash plate 20
1a is provided with an annular first projection (swash plate side projection) 22 which abuts against an outer peripheral edge 52a of a rear side race (swash plate side race) 52 of the front side thrust bearing 9.

The rear end surface 21b of the boss 21 of the swash plate 20
Is provided with an annular second projection (swash plate-side projection) 23 which abuts against an outer peripheral edge 61a of a front race (swash plate-side race) 61 of the rear thrust bearing 10.

On the rear end surface 30a of the boss portion 30 of the front cylinder block 1, a front race (cylinder block race) 5 of the front thrust bearing 9 is provided.
An annular third projection (cylinder block side projection) 31 is provided which is abutted against the inner peripheral edge of the cylinder 1.

Boss 40 of rear cylinder block 2
Of the rear thrust bearing 10
An annular fourth projection (cylinder block-side projection) 41 is provided which abuts against the inner peripheral edge of the rear-side race (cylinder block-side race) 62.

The front thrust bearing 9 comprises an annular front race 51, an annular rear race 52, and a plurality of balls 53 sandwiched between the races 51,52.

The rear thrust bearing 10 comprises an annular front race 61, an annular rear race 62, and a plurality of balls 63 sandwiched between the races 61, 62.

As described above, the outer peripheral edge 52a of the rear race 52 of the front thrust bearing 9 is in contact with the first projection 22 of the boss 21 of the swash plate 20, and the rear race 5
The thickness of the outer peripheral edge 52 a of the second 2 is smaller than the thickness of the inner peripheral edge 52 b not in contact with the first protrusion 22.

Similarly, the outer peripheral edge 61a of the front race 61 of the rear thrust bearing 10 is
The thickness of the outer peripheral edge 61 a of the front race 61 that is in contact with the first second projection 23 is smaller than the thickness of the inner peripheral edge 61 b that does not contact the second projection 23.

The boss 30 of the cylinder block 1 is pressed against the boss 21 of the swash plate 10 through the thrust bearing 9, and the boss 40 of the cylinder block 2 is pressed through the thrust bearing 10. When the preload is applied to the swash plate 20, the outer peripheral edge 52a of the rear race 52 of the front thrust bearing 9 bends, and at the same time, the front race 61 of the rear thrust bearing 10 as shown in FIG. The outer peripheral edge 61a also bends. The amount of deflection at this time is determined by the material and the load, and the axial dimension A between the third protrusion 31 of the boss portion 30 of the cylinder block 1 and the fourth protrusion 41 of the boss portion 40 of the cylinder block 2; It is determined by the difference between the axial dimension B between the front race 51 of the thrust bearing 9 and the rear race 62 of the thrust bearing 10.

Therefore, even if there is a difference between the two axial dimensions, the outer peripheral edge 52a of the rear race 52 of the thrust bearing 9 and the outer peripheral edge 61a of the front race 61 of the thrust bearing 10 according to the difference. Are elastically deformed, and the excessive preload applied to the swash plate 20 is absorbed.
The load applied to the rear race 52 and the front race 61 is close to the load assumed at the time of design.

According to this embodiment, an appropriate preload can be applied to the swash plate 20 without complicated adjustment such as part matching processing or changing the thickness of the race. , 41 and each race 51, 52, 6
It is possible to suppress the abrasion of the contact portion between the swash plate 20 and the swash plate 20, thereby preventing generation of abnormal noise due to rattling of the swash plate 20.

In the above-described embodiment, the thickness of the outer peripheral edge 52a of the rear race 52 of the front thrust bearing 9 is made smaller than the thickness of the inner peripheral edge 52b of the race 52, and the rear thrust Although the case where the thickness of the outer peripheral edge 61a of the front race 61 of the bearing 10 is made smaller than the thickness of the inner peripheral edge 61b of the race 61 has been described, as another embodiment, the boss 30 of the cylinder block 1 is used. An annular third projection (cylinder block side projection) is provided on the rear end face 30a of the boss portion 40 of the front side thrust bearing (not shown), which abuts against an outer peripheral edge of a front side race of the front side thrust bearing. An annular fourth projection (cylinder block side projection) abutting against the outer peripheral edge of the rear race of the rear thrust bearing (not shown) is provided on the end face 40a. The thickness of the outer peripheral edge of the front race of the front thrust bearing in contact with the third projection is made smaller than the thickness of the inner peripheral edge of the race, and the front projection contacts the fourth projection. The thickness of the outer peripheral portion of the rear race of the rear thrust bearing may be smaller than the thickness of the inner peripheral portion of the race. In the case of this embodiment, the thickness of the outer peripheral edge of the rear race of the front thrust bearing may be smaller than or the same as the thickness of the inner peripheral edge of the same race as in the embodiment of FIG. The thickness of the outer peripheral edge of the front race of the rear thrust bearing may be smaller than or the same as the thickness of the inner peripheral edge of the same race as in the embodiment of FIG. Is also good.

In the above embodiment, the protrusion 2
Although the case of the annular projection has been described as 2, 23, 31, 41, the annular projection may be partially cut away so as to have a plurality of contact surfaces with the race.

In the above embodiment, a ball bearing is used as the thrust bearing. However, a needle roller bearing or the like may be used.

[0040]

As described above, according to the swash plate type compressor according to the first aspect of the present invention, when the swash plate is preloaded, the outer peripheral edge of one or both races of the thrust bearing is reduced. The portion that contacts the swash plate side protrusion or cylinder block side protrusion is elastically deformed according to the load, and the excess preload applied to the swash plate is absorbed, so that a moderate preload can be applied to the swash plate without complicated adjustment. Can be provided, and wear of the contact portion can be suppressed, and generation of abnormal noise due to rattling of the swash plate can be prevented.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view showing a part of the swash plate type compressor of FIG.

FIG. 2 is a longitudinal sectional view of a swash plate type compressor according to one embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a conventional swash plate type compressor.

FIG. 4 is an enlarged sectional view showing a part of the swash plate type compressor of FIG.

FIG. 5 is a sectional view showing a state in which a drive shaft and a swash plate are removed from the swash plate compressor of FIG. 3;

[Explanation of symbols]

 Reference Signs List 1 front side cylinder block 2 rear side cylinder block 7 drive shaft 9 front side thrust bearing 10 rear side thrust bearing 20 swash plate 21 swash plate boss portion 22 first projection 23 second projection 30 front side cylinder block Boss part 31 Third protrusion 40 Boss part of rear cylinder block 41 Fourth protrusion 51, 61 Front side race 52, 62 Rear side race 52a, 61a Outer rim 52b, 61b Inner rim 53, 63 Ball

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Katsutoshi Enomoto 39, Higashihara, Chiyo, Odai-gun, Osato-gun, Saitama

Claims (1)

[Claims] 1. A front side and a rear side cylinder block joined to each other in an axial direction, a drive shaft penetrating a boss portion of each cylinder block, and fixed to the drive shaft and housed in the cylinder block. The swash plate, the swash plate and the front cylinder block boss, and the swash plate and the rear cylinder block boss, A thrust bearing rotatably supporting the swash plate, a swash plate side projection provided on the boss portion of the swash plate and abutting against the thrust bearing, and a cylinder block side provided on the boss portion of each of the cylinder blocks and abutting on the thrust bearing. A swash plate type compressor having a projection, wherein an outer peripheral edge of at least one of a swash plate side race and a cylinder block side race of the thrust bearing; The thickness of the portion that contacts the swash plate side projection or the cylinder block side projection is the inner peripheral edge of the one race and the portion that does not contact the swash plate side projection or the cylinder block side projection. A swash plate compressor characterized by being smaller than the plate thickness.