JPH09250453A - Swash plate type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent abnormal noises from being generated due to ricketiness during operation of a swash plate type compressor by restricting the axial wear of a protrusion and a thrust trace. SOLUTION: The protrusion contact faces of first to fourth protrusions 22, 23, 31, and 41 are formed in the tapered shape corresponding to the shapes of laces 109a, 109b, 110a, and 110b of thrust bearings 109 and 110 during deformation. When pre-load is applied to a swash plate 120, the protrusions 22, 23, 31, and 41 and the laces 109b, 110a, 109a, and 110b come into face contact with each other, and the axial wear-out of the protrusions 22, 23, 31, and 41 and the laces 109b, 110a, 109a, and 110b is restricted.

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.

The cylinder block 101 on the front side and the cylinder block 102 on the rear side of the swash plate compressor 100 are axially opposed and joined to each other. The front head 104 is fixed to one end of the joined cylinder blocks 101 and 102 via a valve plate 103 or the like, and the rear head 10 is fixed to the other end via a valve plate 105 or the like.
6 is fixed.

A drive shaft 107 is arranged at the center of the cylinder blocks 101 and 102, and a swash plate 120 is fixed to the drive shaft 107. The swash plate 120 is formed by a front thrust bearing 109 and a rear thrust bearing 110. It is rotatably supported. The swash plate 120 is a swash plate chamber 11 formed inside the joined cylinder blocks 101 and 102.
1 housed.

The cylinder blocks 101, 102 are provided with a plurality of cylinder bores 112 (only one cylinder bore 112 is visible in FIG. 3). Each cylinder bore 112 is parallel to the drive shaft 107 and
7 are arranged at predetermined intervals in the circumferential direction centered on 7. A piston 113 is slidably accommodated in each cylinder bore 112. In each cylinder bore 112, compression chambers 114 and 115 are formed on both sides with the piston 113 interposed therebetween. The piston 113 has shoes 116 and 117.
It is connected to the swash plate 120 via.

A front side boss portion 130 is integrally provided at the center of the cylinder block 101. The front side boss portion 130 is mounted on the drive shaft 1 via the radial bearing 140.
The front end of 07 is rotatably supported. The rear side end surface of the front side boss portion 130 abuts the front side end surface of the boss portion 121 of the swash plate 120 via the front side thrust bearing 109.

A rear boss 140 is integrally provided at the center of the cylinder block 102. Rear boss 1
40 rotatably supports the rear end of the drive shaft 107 via a radial bearing 150. The front end surface of the rear boss portion 140 abuts the rear end surface of the boss portion 121 of the swash plate 120 via the rear thrust bearing 110.

FIG. 4 is a longitudinal sectional view of a main part of a conventional swash plate compressor.

The front side thrust bearing 109 comprises a front side race 109a, a rear side race 109b, and a needle roller 109c sandwiched by the front side race 109a and the rear side race 109b.

Similarly, the rear thrust bearing 110 includes a front race 110a, a rear race 110b, and a rear race 110b.
It is composed of a needle roller 110c sandwiched between a front side race 110a and a rear side race 110b.

The boss 121 of the swash plate 120 has a front end 121a provided with a first projection 122 which is abutted against the outer peripheral edge of the rear race 109b of the front thrust bearing 109.

Rear end face 1 of boss 121 of swash plate 120
The second protrusion 1 that is abutted against the outer peripheral edge portion of the front race 110a of the rear thrust bearing 110 is provided at 20b.
23 are provided.

The rear end surface 130a of the boss portion 130 of the front cylinder block 101 is provided with a third protrusion 131 which is abutted against the inner peripheral edge of the front race 109a of the front thrust bearing 109.

The front end face 140a of the boss portion 140 of the rear cylinder block 102 is provided with a fourth protrusion 141 which is abutted against the inner peripheral edge portion of the rear race 110b of the rear thrust bearing 110.

FIG. 5 is a partially enlarged view of FIG.
5A shows the swash plate before being preloaded, and FIG. 5B shows it after being preloaded.

In order to prevent the swash plate 120 from moving in the axial direction and generating abnormal noise during operation, the thrust bearing 109
The swash plate 109 is preloaded via the. In this swash plate compressor, the first protrusion 122 of the boss 121 of the swash plate 120 is on the outer peripheral edge of the race 109b, and the third protrusion 131 of the boss 130 of the cylinder block 101 is on the inner peripheral edge of the race 109a. The races 109b, 10 are abutted against each other, and in that state, a force is applied in the arrow direction of FIG.
9a is bent (see FIG. 5 (b)), and its elasticity is used to apply preload.

Although not shown, the thrust bearing 11
Similarly for 0, the preload is applied.

[0018]

[Problems to be Solved by the Invention] The above-mentioned race 109
Protrusion 1 hitting b, 110a, 109a, 110b
The abutting surfaces of 22, 123, 131 and 141 are orthogonal to the drive shaft 107 as shown in FIG.

Therefore, when the swash plate 120 is preloaded, the protrusions 122, 123, 131, 141 and the races 109b, 110a, 109a, 110b are in substantially line contact with each other (see FIG. 5B). The preload is concentrated on the narrow contact surface between the races 109b, 110a, 109a, 110b and the protrusions 122, 123, 131, 141, and the pressure on the contact surface becomes higher than the pressure assumed at the time of design.

Therefore, when the swash plate type compressor is operated, the projections 122, 123, 131, 141 and the race 10 are driven.
9b, 110a, 109a, and 110b have a problem in that the contact portions are abraded early (abrasion in the axial direction), which causes abnormal noise due to rattling during operation.

The present invention has been made in view of the above circumstances, and its object is to suppress axial wear of projections and thrust traces and prevent abnormal noise due to rattling during operation of a swash plate compressor. That is.

[0022]

In order to solve the above-mentioned problems, a swash plate type compressor according to a first aspect of the present invention comprises a front side cylinder block and a rear side cylinder block which are joined to each other in the axial direction, and each of the cylinder blocks. Drive shaft penetrating the boss portion of the swash plate, a swash plate fixed to the drive shaft and housed in the cylinder block, a front end surface of the boss portion of the swash plate, and a rear side of the boss portion of the front cylinder block. A front thrust bearing that is mounted between the end face and rotatably supports the swash plate, and is provided on the front end face of the boss of the swash plate and abuts against the rear race of the front thrust bearing. A first protrusion, a second protrusion provided on a rear end surface of the boss portion of the swash plate and abutting against a front race of the rear thrust bearing, and a front side cylinder. A third protrusion provided on the rear end face of the boss portion of the block and abutting against the front race of the front thrust bearing, and a third protrusion provided on the front end face of the boss portion of the rear cylinder block, A fourth protrusion that abuts the rear race of the side thrust bearing, and presses the boss portions of the swash plate against the boss portions of the cylinder blocks to bend and deform the thrust bearings. In the swash plate compressor, the abutting surfaces of the first, second, third, and fourth projections are formed in a taper shape corresponding to the shape of the races of the thrust bearings at the time of deformation.

When the swash plate is preloaded, the race is curved and deformed. However, since the abutting surface of the protrusion is formed in a taper shape corresponding to the inclination of the race, the protrusion and the race come into surface contact with each other, and The surface pressure acting between the protrusions can be the pressure assumed at the time of design.

According to a second aspect of the present invention, the first, second,
It is characterized in that the protrusions 3 and 4 are formed in an annular shape.

By forming the protrusion in an annular shape, the contact area between the race and the annular protrusion can be increased.

[0026]

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

FIG. 1 is a longitudinal sectional view of a main part of a swash plate type compressor according to an embodiment of the present invention. The same parts as those in FIG. 4 are designated by the same reference numerals and the description thereof will be omitted.

The front end 121a of the boss 121 of the swash plate 120 is provided with a first protrusion 22 that is abutted against the annular outer peripheral edge of the rear race 109b of the front thrust bearing 109.

Rear end face 1 of boss 121 of swash plate 120
The second protrusion 23, which is abutted against the annular outer peripheral edge portion of the front race of the rear thrust bearing 110, is provided at 21 b.
Is provided.

The rear end surface 130a of the boss portion 130 of the front cylinder block 101 is provided with a third protrusion 31 which is abutted against the annular inner peripheral edge of the front race 109a of the front thrust bearing 109. .

The boss portion 1 of the rear cylinder block 102
The front end face 140 a of the 40 is provided with a fourth protrusion 41 that is abutted against the inner peripheral edge of the rear race 110 b of the rear thrust bearing 110.

FIG. 2 is a partially enlarged view of FIG.
(A) shows before applying the preload, and FIG. 2 (b) shows after applying the preload.

The abutting surfaces of the first to fourth protrusions 22, 23, 31, 41 are races 109b, 110a, 10 of the thrust bearings 109, 110 when they are deformed by preloading.
It is formed in a tapered shape corresponding to the shapes of 9a and 110b. The taper is determined by the elasticity of the material used for the races 109b, 110a, 109a, 110b forming the thrust bearings 109, 110 and the load during preload.

Before preloading the swash plate 120 (FIG. 2A), the first boss portion 121 of the swash plate 120 is
The protrusion 22 and the outer peripheral edge of the rear race 109b of the front thrust bearing 109 are in line contact with each other.

Similarly, the front cylinder block 10
The third protrusion 31 of the first boss portion 130 and the inner peripheral edge portion of the front race 109a of the front thrust bearing 109 are in line contact with each other.

In this state, when a force is applied in the direction of the arrow in FIG. 2A to preload the swash plate 120, the first protrusion 2
2, the outer peripheral edge of the race 109b on the rear side of the front thrust bearing 109 is on the front side (to the left in FIG. 2).
The third protrusion 31 causes the inner peripheral edge portion of the front race 109a of the front thrust bearing 109 to bend toward the rear side (to the right in FIG. 2). That is, the rear race 109b and the front race 109a are elastically deformed (curved) by a predetermined amount determined by the material and load.

At this time, the first and third protrusions 22 and 3 of the swash plate 120 and the boss portion 130 of the cylinder block 101.
Since the abutting surface of No. 1 is formed with a taper corresponding to the inclination, the abutting surfaces of the protrusions 22 and 31 are in surface contact with the rear side race 109b and the front side race 109a.

Therefore, the load applied to the rear-side race 109b and the front-side race 109a is close to the load assumed at the time of design.

As a result, the protrusions 22 and 31 and the race 109
Axial wear of a and 109b is significantly reduced.

The relationship between the second and fourth protrusions 23 and 41 and the races 110a and 110b of the rear thrust bearing 110 is that the first and third protrusions 22 and 31 and the race 109a of the front thrust bearing 109 are the same. , 109b, and the description thereof will be omitted.

According to this embodiment, the projections 22, 23,
31, 41 and races 109b, 110a, 109a, 1
It is possible to suppress the wear of the contact portion with 10b and prevent the generation of abnormal noise due to rattling of the swash plate 120.

Also, in the above-described embodiment, the swash plate 1
The projections 22 and 23 formed on the boss portion 121 of the cylinder block 1 are attached to the outer peripheral edge portions of the races 109b and 110a.
Protrusions 3 formed on bosses 130 and 140 of 01 and 102
Although the case where the races 1, 41 are abutted against the inner peripheral edge portions of the races 109a, 110b has been described, the races are not limited to this configuration as long as the races can be elastically deformed into a curved shape, and as another embodiment, The protrusions 22 and 23 formed on the boss portion 121 of the swash plate 120 are attached to the race 109.
b, the inner peripheral edge of the 110a, the cylinder block 101,
The protrusions 31 and 41 formed on the boss portion 121 of the 102 may abut against the outer peripheral edge portions of the races 109a and 110b, respectively.

Incidentally, in the above-described embodiment, the protrusion 2
Although the case where the annular protrusions are used as 2, 23, 31, 41 has been described, instead of this, the annular portion may be partially cut out so that the contact surface with the race is intermittent. .

[0044]

As described above, according to the swash plate type compressor of the first aspect of the invention, when the swash plate is preloaded, the race is elastically deformed into a bay shape, but the projection and the race are different from each other. Since they are in surface contact with each other, abrasion of the protrusions and the race in the axial direction can be suppressed, and generation of abnormal noise due to rattling of the swash plate can be prevented.

According to the swash plate compressor of the second aspect of the present invention, since the contact area between the race and the annular protrusion can be increased by forming the protrusion in an annular shape, a large preload can be added. It is possible to prevent rattling more reliably.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part of a swash plate compressor according to an embodiment of the present invention.

FIG. 2 is a partially enlarged view of FIG. 1;

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

FIG. 4 is a longitudinal sectional view of a main part of a conventional swash plate compressor.

FIG. 5 is a partially enlarged view of FIG. 4;

[Explanation of symbols]

 22 1st protrusion 23 2nd protrusion 31 3rd protrusion 41 4th protrusion 101 Front side cylinder block 102 Rear side cylinder block 107 Drive shaft 108 Swash plate 109 Front side thrust bearing 110 Rear side thrust bearing 120 Swash plate 121 Swash plate boss 130 Front boss 140 Rear boss

Claims (2)

[Claims] 1. A front side cylinder block and a rear side cylinder block that are joined to each other in an axial direction, a drive shaft that penetrates a boss portion of each cylinder block, a drive shaft that is fixed to the drive shaft, and is housed in the cylinder block. A swash plate, a front thrust bearing mounted between the front end surface of the boss portion of the swash plate and the rear end surface of the boss portion of the front cylinder block, and rotatably supporting the swash plate; A first protrusion provided on a front end surface of a swash plate boss portion and abutting against a rear race of the front thrust bearing; and a rear projection provided on a rear end surface of the swash plate boss portion, No. 2 that is abutted to the front race of the bearing
And a third protrusion provided on the rear end surface of the boss portion of the front side cylinder block and abutted against the front race of the front thrust bearing, and a boss portion of the rear side cylinder block. A fourth protrusion provided on the front end face and abutting against the rear race of the rear thrust bearing, and pressing the boss portions of the both cylinder blocks against the boss portion of the swash plate, respectively. In the swash plate compressor in which the thrust bearing is curved and deformed, the abutting surfaces of the first, second, third, and fourth projections are formed in a taper shape corresponding to the race shape of the thrust bearings at the time of deformation. The swash plate compressor is characterized by 2. The swash plate compressor according to claim 1, wherein the first, second, third, and fourth projections are formed in an annular shape.