JP2002242839A - Compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressor capable of suppressing the deformation of a thrust face inside a housing, even if a front housing and a rear housing are fastened by a bolt. SOLUTION: A ring-shaped rigid body plate 28 is disposed in the rear end face of the rear housing 26, and the bolt 4 penetrates through the rigid body plate 28 and the rear housing 26 with the surface of the rigid body plate 28 set as a seat face and is screwed into the front housing 1. The front housing 1 and the rear housing 26 are thereby fastened in the thrust direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a compressor,
In particular, the present invention relates to suppression of deformation of a thrust surface inside a housing due to a fastening force of a bolt connecting the front housing and the rear housing.

[0002]

2. Description of the Related Art The configuration of a conventional swash plate type compressor is shown in FIG. The front housing 1 and the rear housing 2 are fastened by bolts 4 with the gasket 3 interposed therebetween, thereby forming the entire housing 5.
A step 6 is formed in the front housing 1,
The retainer forming plate 7 is joined to the step 6
An annuloplasty plate 8, a valve plate 9, and an annuloplasty plate 10 are fitted. A suction chamber 12 is provided between the retainer forming plate 7 and the front end wall 11 of the front housing 1.
And the discharge chamber 13 are defined with a partition wall 14 therebetween.

[0003] A cylinder 15 is fitted into the front housing 1 so as to be joined to the valve forming plate 10, and is fixed to the front housing 1 by bolts 16. A rotary shaft 17 is rotatably supported by the cylinder 15, the front housing 1 and the rear housing 2. The front end of the rotating shaft 17 protrudes from the front housing 1 to the outside, and is connected to a rotary drive source (not shown) such as an engine or a motor of the vehicle. In the rear housing 2, a rotation support 18 is fixed to a rotation shaft 17, and a swash plate 19 is provided so as to engage with the rotation support 18. The swash plate 19 has a guide hole 20 formed in the rotary support 18 with a guide pin 20 formed in the swash plate 19 in a state in which the rotary shaft 17 penetrates a through hole formed in the center thereof.
1, is slidably fitted to the guide shaft 1, and rotates integrally with the rotation shaft 17 by the cooperation of the guide pin 20 and the guide hole 21, and is slidably and tiltably supported in the axial direction of the rotation shaft 17. The rotary support 18 is rotatably supported by a thrust bearing 22 disposed on the inner wall of the rear end of the rear housing 2.

[0004] A plurality of cylinder bores 23 are arranged in the cylinder 15 around a rotation shaft 17.
A piston 24 is slidably accommodated in 3. Each piston 24 is engaged with the outer peripheral portion of the swash plate 19 via a shoe 25, and when the swash plate 19 rotates together with the rotation shaft 17, each piston 24 moves inside the cylinder bore 23 through the shoe 25 to rotate the rotation shaft 17. Reciprocates in the axial direction.

[0005]

However, since the bolt 4 for fastening the front housing 1 and the rear housing 2 is located near the thrust bearing 22, the fastening force of the bolt 4 causes the rear housing 2 to be rearward. If the thrust surface of the inner wall of the end is deformed, the deformation affects the thrust bearing 22 as an eccentric load, causing abnormal noise during the operation of the compressor and shortening the life of the thrust bearing 22. Was. In particular, when carbon dioxide is used as a refrigerant, since it is used in a high pressure state, it is necessary to increase the tightening force of the bolt 4 to counter the high pressure.
Eccentric load is likely to act on

The present invention has been made to solve such a problem, and provides a compressor capable of suppressing deformation of the thrust surface inside the housing even when the front housing and the rear housing are fastened with bolts. The purpose is to do.

[0007]

In the compressor according to the present invention, a rigid plate is disposed between the end face of the front housing or the rear housing and the heads of the plurality of bolts, and the front housing and the front housing are connected via the rigid plate. The rear housing is fastened with a plurality of bolts. By doing so, the tightening force of the plurality of bolts is evenly applied to the end surface of the front housing or the rear housing via the rigid plate, and the deformation of the thrust surface is suppressed. Note that a ring-shaped rigid plate may be used as the rigid plate, and a plurality of bolts may be arranged at equal intervals in a circumferential direction of the rigid plate. Alternatively, a plurality of bolts may be arranged at equal intervals in the circumferential direction of the disk-shaped rigid plate.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a configuration of a swash plate type variable displacement compressor according to an embodiment of the present invention. The aluminum front housing 1 and the rear housing 26 are joined via the gasket 3, thereby forming the entire housing 27. A ring-shaped rigid plate 28 made of iron is arranged on the rear end surface of the rear housing 26, and the bolts 4 penetrate the rigid plate 28 and the rear housing 26 with the surface of the rigid plate 28 as a seating surface. Screwed into. Thus, FIG.
As shown in FIG. 2, the plurality of bolts 4 are arranged at equal intervals in the circumferential direction of the ring-shaped rigid plate 28, whereby the front housing 1 and the rear housing 26 are fastened in the thrust direction.

The other components have the same configuration as that of the conventional compressor shown in FIG. That is, the step 6 is formed in the front housing 1, and the retainer forming plate 7, the valve forming plate 8, the valve plate 9, and the valve forming plate 10 are fitted so as to be joined to the step 6. A suction chamber 12 and a discharge chamber 13 are defined between the retainer forming plate 7 and the front end wall 11 of the front housing 1 with a partition wall 14 therebetween.

A cylinder 15 is fitted into the front housing 1 so as to be joined to the valve forming plate 10, and is fixed to the front housing 1 by bolts 16. The rotary shaft 17 is rotatably supported by the cylinder 15, the front housing 1 and the rear housing 26. The front end of the rotating shaft 17 protrudes from the front housing 1 to the outside, and is connected to a rotary drive source (not shown) such as an engine or a motor of the vehicle. In the rear housing 26, a rotation support 18 is fixed to the rotation shaft 17 and a swash plate 19 is provided so as to engage with the rotation support 18. The swash plate 19 can slide a guide pin 20 formed in the swash plate 19 into a guide hole 21 formed in the rotation support member 18 in a state where the rotation shaft 17 penetrates a through hole formed in a center portion thereof. Guide pin 2
The rotation of the rotation shaft 17 is supported by the rotation of the rotation shaft 17 and the rotation of the rotation shaft 17 integrally with the rotation of the rotation shaft 17. The rotary support 18 is rotatably supported by a thrust bearing 22 provided on the inner wall of the rear end of the rear housing 26.

A plurality of cylinder bores 23 are formed in the cylinder 15 around a rotation shaft 17.
A piston 24 is slidably accommodated in 3. Each piston 24 is engaged with the outer peripheral portion of the swash plate 19 via a shoe 25, and when the swash plate 19 rotates together with the rotation shaft 17, each piston 24 moves inside the cylinder bore 23 through the shoe 25 to rotate the rotation shaft 17. Reciprocates in the axial direction.

As described above, the ring-shaped rigid plate 28
, The front housing 1 and the rear housing 26 are fastened with the plurality of bolts 4, so that the tightening force of each bolt 4 is dispersed by the rigid plate 28 and the rear housing 2
6 are evenly added to the rear end face. For this reason, the deformation of the rear end inner wall surface of the rear housing 26 which is the thrust surface is suppressed, and the partial load is prevented from acting on the thrust bearing 22.

In the compressor shown in FIG. 1, seven cylinder bores 23 are formed in the cylinder 15 at regular intervals, and in accordance with this, the seven bolts 4 are used with the seven bolts 4 as shown in FIG. Although the housing 1 and the rear housing 26 are fastened to each other, the present invention is not limited to this, and any number of bolts 4 may be used. However, when the number of bolts 4 is large, the tightening force is easily dispersed, which is effective for preventing deformation of the thrust surface.

In the above-described embodiment, the ring-shaped rigid plate 28 is used. However, the present invention is not limited to this. For example, when the end surface of the housing on which the rigid plate is arranged is flat, for example, a disk-shaped rigid plate is used. It is also possible to use a rigid plate and arrange a plurality of bolts at equal intervals in the circumferential direction. Also, one rigid plate does not have to extend over all bolts 4,
For example, as shown in FIG. 3, the rigid plate 28 may be divided into a plurality of rigid plates 28, and each rigid plate 28 may support the head of a plurality of bolts 4. Further, in the above embodiment, since the thrust bearing 22 is installed on the inner wall surface at the rear end of the rear housing 26, the rigid plate 28
Is disposed on the rear end surface of the rear housing 26. However, in a compressor in which the thrust bearing is installed on the inner wall surface of the front end of the front housing, it is preferable to dispose a rigid plate on the end surface of the front housing.

[0015]

As described above, according to the present invention, a rigid plate is disposed between the end surface of the front housing or the rear housing and the heads of the plurality of bolts, and the front housing is connected to the front housing via the rigid plate. Since the bolt is fastened to the rear housing with a plurality of bolts, the tightening force of each bolt is evenly applied to the end surface of the front housing or the rear housing via the rigid plate, so that the deformation of the thrust surface can be suppressed. Therefore, it is possible to avoid the generation of abnormal noise during the operation of the compressor and the shortening of the life of the thrust bearing due to the deformation of the thrust surface. That is, since the bolt tightening force can be increased without any trouble, it is particularly effective when carbon dioxide is used as the refrigerant. Note that the rigid plate may have a ring shape or a disk shape.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a configuration of a swash plate type variable displacement compressor according to an embodiment of the present invention.

FIG. 2 is a rear view showing the compressor of FIG.

FIG. 3 is a rear view showing a compressor according to another embodiment.

FIG. 4 is a side sectional view showing a configuration of a conventional compressor.

[Explanation of symbols]

1 front housing, 4 bolts, 17 rotating shafts,
18 rotating support, 19 swash plate, 22 thrust bearing, 26 rear housing, 28 rigid plate.

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Claims (3)

[Claims] In a compressor in which a front housing and a rear housing are fastened in a thrust direction, a rigid plate is disposed between an end surface of the front housing or the rear housing and heads of a plurality of bolts. A front housing and a rear housing are fastened with a plurality of bolts through the compressor. 2. The compressor according to claim 1, wherein the rigid plate has a ring shape, and a plurality of bolts are arranged at equal intervals in a circumferential direction of the rigid plate. 3. The compressor according to claim 1, wherein the rigid plate has a disk shape, and a plurality of bolts are arranged at equal intervals in a circumferential direction of the rigid plate.