JP2000240565A - Swash plate type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the radiation noise caused by the axial vibration generated in an internal mechanism part. SOLUTION: In this compressor, the compressive reaction force added to a shaft 6 through a single-head piston 9 and a swash plate 7 is received by a cylinder block 2 through a thrust bearing 26 mounted between plural cylinder bores 1 of the cylinder block 2. The shaft 6 is supported by the cylinder block 2 and a front housing 3 opposite to the cylinder block 2 in the predetermined direction respectively through a block side radial bearing 4 and a housing side radial bearing 5. The single-head piston 9 is inserted into the cylinder bore 1 and engaged with the swash plate in the predetermined direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a swash plate type compressor.

[0002]

2. Description of the Related Art Various types of swash plate compressors are known, one example of which is described in JP-A-1-190974. FIG. 3 shows another example of the swash plate type compressor. The illustrated swash plate compressor includes a cylinder block 2 having a plurality of cylinder bores 1 around an axis extending in a predetermined axial direction, a front housing 3 axially opposed to one end of the cylinder block 2, A shaft 6 supported on the front housing 3 via a block-side radial bearing 4 and a housing-side radial bearing 5, a swash plate 7 provided on the shaft 6, and a shoe 8 inserted into each cylinder bore 1 and mounted on the swash plate 7. And a single-headed piston 9 axially engaged therethrough. A cylinder head 12 is fixed to the other end of the cylinder block 2 via a valve plate 11. A suction chamber 13 and a discharge chamber 14 are formed in the cylinder head 12.

A rotor 15 is fixed to the shaft 6 and a sleeve 16 is provided. The swash plate 7 is connected to the rotor 15 and the sleeve 16, and the inclination angle with respect to the shaft 6 is made variable. The swash plate 7 is inclined with respect to the shaft 6 during a normal compression operation.

During operation of the swash plate compressor, the shaft 6 is driven to rotate. When the shaft 6 rotates, the rotor 15 and the swash plate 7 also rotate around the axis. As the swash plate 7 rotates, the single-headed piston 9 is reciprocated in the cylinder bore 1 via the shoe 8. By reciprocating the single-headed piston 9, the fluid is compressed and transferred from the suction chamber 13 to the discharge chamber 14 through the cylinder bore 1. This swash plate type compressor is of a so-called variable capacity type in which the compression capacity fluctuates according to the change in the inclination angle of the swash plate 7.

[0005] When a fluid is compressed, a compression reaction force is generated. This compression reaction force is transmitted to the shaft 6 via the single-headed piston 9, the shoe 8, and the swash plate 7, and the shaft 6 and the rotor 15
To the front housing 3 side. To receive the axial compression reaction force, a thrust bearing 17 facing the rotor 15 is provided in the front housing 3.

[0006]

In the swash plate type compressor shown in FIG. 3, the thrust bearing 17 provided on the front housing 3 regulates the compression reaction force in the axial direction. The axial vibration is transmitted mainly to the swash plate 7, the rotor 15, and the thrust bearing 17 in this order. The axial vibration causes the plate portion 3a extending in the radial direction of the front housing 3 and an electromagnetic clutch (not shown) attached thereto to vibrate, thereby generating radiation noise.

Although measures have been taken to reduce the level of radiation noise by increasing the rigidity of the front housing 3, there is a limit in the limited dimensions, and effective measures may not be taken in some cases.

It is therefore an object of the present invention to provide a swash plate type compressor in which the generation of radiation noise based on axial vibration generated in an internal mechanism is reduced.

Another object of the present invention is to provide a swash plate type compressor capable of reducing the axial dimension.

[0010]

According to the present invention, there is provided a cylinder block having a plurality of cylinder bores around an axis extending in a predetermined direction, a front housing facing the cylinder block in the predetermined direction, and the cylinder block. A shaft supported by the front housing via a block-side radial bearing and a housing-side radial bearing; a swash plate provided on the shaft; and a swash plate inserted into each of the plurality of cylinder bores and in the swash plate in the predetermined direction. And a thrust bearing that receives a compression reaction force applied to the shaft via the single-headed piston and the swash plate. The compression reaction force is received by the cylinder block. Swash plate type compressor, characterized in that the so that is obtained.

The shaft has an outward flange at an end thereof, the cylinder flock has an inward flange between the block side radial bearing and the outward flange, and the thrust bearing has It is good to be arrange | positioned between an outward flange part and the said inward flange part.

It is preferable that a biasing means for biasing the outward flange portion toward the inward flange portion is provided.

[0013] An auxiliary thrust bearing may be provided which engages the shaft and the cylinder block and prevents movement of the shaft in a direction in which the outward flange portion is separated from the inward flange portion.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A swash plate type compressor according to a first embodiment of the present invention will be described with reference to FIG. FIG.
The same reference numerals are given to the same parts as those described above, and the description is omitted.

The swash plate type compressor shown is also of a variable capacity type. In this swash plate compressor, a small diameter portion 21 is provided at the end of the shaft 6 on the cylinder block 2 side, and a cylindrical flange part 22 is fitted therein and fixed with a nut 23. The flange component 22 has an outward flange portion 24. On the other hand, an inward flange portion 25 is formed in the cylinder block 2 between the block-side radial bearing 4 and the outward flange portion 24. The outward flange portion 24 and the inward flange portion 25 face each other in the axial direction.

A thrust bearing 26 is disposed between the outward flange 24 and the inward flange 25. The thrust bearing 26 corresponds to the thrust bearing 17 in FIG. 3, and is for receiving a compression reaction force applied to the shaft 6 via the single-headed piston 9 and the swash plate 7. In the thrust bearing 26, the outward flange portion 24 has the shaft 6.
It is of a configuration that allows it to rotate with it.

Further, a compression coil spring device 27 is provided between the outward flange portion 24 and the valve plate 11 to urge the outward flange portion 24 toward the inward flange portion 25. The compression coil spring device 27 constitutes an urging means. The compression coil spring device 27 also has a configuration that allows the outward flange portion 24 to rotate together with the shaft 6.

According to the swash plate type compressor shown in FIG. 1, the cylinder block 2 receives a compression reaction force applied to the shaft 6 via the single-headed piston 9 and the swash plate 7 through the thrust bearing 26. The transmission of the axial vibration generated in the mechanism portion to the plate portion 3a extending in the radial direction of the front housing 3 and the electromagnetic clutch (not shown) is prevented. Therefore, generation of radiation noise from the swash plate compressor can be reduced.

Further, since the front housing 3 does not receive the compression reaction force, the rigidity in the axial direction can be reduced. Therefore, it is possible to design the swash plate compressor to reduce the axial dimension.

Turning to FIG. 2, a swash plate type compressor according to a second embodiment of the present invention will be described. 1 are given the same reference numerals, and description thereof is omitted.

In the illustrated swash plate type compressor, a swash plate 7 is fixed to a shaft 6 with a fixed inclination angle. Therefore, this swash plate compressor is of a fixed displacement type.

This swash plate type compressor has a locking ring 31 locked in the middle of the shaft 6, and an auxiliary thrust disposed between the locking ring 31 and an axial end face at the center of the cylinder block 2. And a bearing 32. That is, the auxiliary thrust bearing 32 is connected to the shaft 6 via the locking ring 31.
And the cylinder block 2 is directly engaged, and the outward flange portion 24 prevents the shaft 6 from moving away from the inward flange portion 25.

Also in the swash plate type compressor of FIG. 2, since the compression reaction force is received by the cylinder block 2, the same operation and effect as those of the swash plate type compressor of FIG. 1 can be obtained. In addition,
Since the auxiliary thrust bearing 32 prevents the movement of the shaft 6, the compression coil spring device 27 in FIG. 1 is unnecessary.

[0024]

As described above, the swash plate type compressor according to the present invention can reduce the generation of radiation noise due to the axial vibration generated in the internal mechanism, and can reduce the axial dimension. There is an effect that there is.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a swash plate type compressor according to a first embodiment of the present invention.

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder bore 2 Cylinder block 3 Front housing 4 Block side radial bearing 5 Housing side radial bearing 6 Shaft 7 Swash plate 9 Single head piston 11 Valve plate 12 Cylinder head 15 Rotor 21 Small diameter part 22 Flange part 23 Nut 24 Outward flange part 25 Inward Flange part 26 Thrust bearing 31 Lock ring 32 Auxiliary thrust bearing

Claims (4)

[Claims] 1. A cylinder block having a plurality of cylinder bores around an axis extending in a predetermined direction, a front housing facing the cylinder block in the predetermined direction, and a block-side radial bearing on the cylinder block and the front housing. A shaft supported via a housing-side radial bearing, a swash plate provided on the shaft, a single-headed piston inserted into each of the plurality of cylinder bores and engaged with the swash-plate in the predetermined direction; A swash plate type compressor including a piston and a thrust bearing that receives a compression reaction force applied to the shaft via the swash plate, wherein the thrust bearing is provided between the plurality of cylinder bores of the cylinder block, and the compression reaction force is reduced. Characterized in that it is received by the cylinder block. Plate compressor. 2. The thrust bearing, wherein the shaft has an outward flange at an end thereof, the cylinder block has an inward flange between the block-side radial bearing and the outward flange. The swash plate compressor according to claim 1, wherein the swash plate compressor is disposed between the outward flange portion and the inward flange portion. 3. The swash plate compressor according to claim 2, further comprising: urging means for urging the outward flange toward the inward flange. 4. An auxiliary thrust bearing which engages with the shaft and the cylinder block and prevents movement of the shaft in a direction in which the outward flange portion is separated from the inward flange portion. The swash plate compressor as described.