JPH08105384A - Variable displacement swash plate type compressor - Google Patents

Abstract

PURPOSE: To provide a variable capacity swash plate type compressor which is excellent in the sliding characteristic of an actuator and the sealing performance and excellent in controlling the discharge capacity. CONSTITUTION: In a variable capacity swash plate type compressor provided with a cylinder block 4 having a center bore 40, an actuator 6 which is slidably inserted in the center bore 40, and an O-ring 19 which is fitted to the outer circumferential surface of an actuator 6 and seals the space between the actuator 6 and the cylinder block 4, sealing rings 20, 21 are fitted to the actuator 6 so as to insert the O-ring 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable capacity swash plate compressor used in, for example, a vehicle air conditioner.

[0002]

2. Description of the Related Art In a conventional variable displacement swash plate type compressor, a cylinder block having a center bore, an actuator slidably inserted in the center bore, and an actuator mounted on an outer peripheral surface of the actuator are provided. And an O-ring that seals between the cylinder block and the cylinder block (see, for example, Japanese Patent Application No. 4-115907).

A conventional variable capacity swash plate type compressor of this type will be described in more detail with reference to FIG. The variable capacity swash plate compressor shown in FIG. 6 is a double-headed piston type variable capacity swash plate compressor. This variable capacity swash plate compressor includes a front cylinder block 3, a rear cylinder block 4, an actuator 6, Rotating main shaft 8, swash plate 9, double-headed piston 1
3, front housing 16, and rear housing 18
And have.

The actuator 6 is slidably inserted into a center bore 40 formed in the rear cylinder block 4, and is urged by a coil spring 7 to move toward the front cylinder block 3. The center bore 40 of the rear cylinder block 4 communicates with a control chamber 182 formed in the rear housing 18, and the pressure inside the control chamber 182 is adjustable, so the pressure inside the center bore 40 is also controlled. It changes in response to changes in pressure within chamber 182. An O-ring 1 is provided between the actuator 6 and the rear cylinder block 4.
Sealed by 9, the actuator 6 is adapted to receive the pressure in the center bore 40. Therefore, by controlling the pressure in the control chamber 182, the actuator 6 moves toward the front housing 16 or toward the rear housing 18. Due to the movement of the actuator 6, the inclination angle of the swash plate 9 which engages with the actuator 6 via the connecting body 10 and the thrust needle bearing 11 changes, and accordingly, the stroke of the double-headed piston 13 changes, and as a result, The capacity of the compressor is made variable.

[0005]

As described above, in the conventional variable displacement swash plate type compressor of this type, the seal between the actuator and the cylinder block is made only by the O-ring.

Further, since the actuator supports the rotating main shaft and receives the moment of the rotating main shaft under the compression load,
The actuator tilts and slides in the cylinder block.
Therefore, the O-ring receives an unbalanced load and slides in the cylinder block. Therefore, in the actuator, the cylinder block is liable to be scratched and the O-ring is apt to be damaged. As a result, the sliding characteristics of the actuator and the sealing performance of the O-ring are impaired, which causes a problem that the discharge capacity of the compressor cannot be controlled.

Therefore, the object of the present invention is to prevent the actuator from contacting the cylinder block, ie to prevent galling between the actuator and the cylinder block,
Another object of the present invention is to provide a variable displacement swash plate type compressor that can prevent the pain of the O-ring and can surely control the discharge capacity without impairing the sliding characteristics and the sealing characteristics of the actuator.

[0008]

According to the present invention, a cylinder block having a center bore, an actuator slidably inserted into the center bore, and an actuator mounted on the outer peripheral surface of the actuator are provided. In a variable capacity swash plate compressor including an O-ring for sealing between the cylinder block and the cylinder block, a sealing ring is attached to the actuator so as to sandwich the O-ring. You have the opportunity.

[0009]

In the variable capacity swash plate type compressor of the present invention, the actuator is provided with a plurality of sealing rings, and these sealing rings are arranged on both sides of the O-ring, so that the actuator is tilted. However, the sealing ring can prevent contact (ie, galling) between the actuator and the cylinder block. In addition, the unbalanced load applied to the O-ring can be greatly reduced by the sealing ring, so that the O-ring is not immediately damaged. Therefore, it is possible to improve the sliding characteristics of the actuator and the sealing performance of the O-ring, and as a result, it is possible to reliably control the discharge capacity over a long period of time.

[0010]

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

Referring to FIG. 1, a variable capacity swash plate compressor 1 of the present embodiment is a double-headed piston type variable capacity swash plate compressor, and the variable capacity swash plate compressor 1 includes a front cylinder block 3 It has a rear cylinder block 4, an actuator 6, a rotary spindle 8, and a double-headed piston 13.

The front cylinder block 3 and the rear cylinder block 4 have center bores 30, respectively.
40 and a plurality of cylinder bores 31, 41 are formed. Center bore 30 of front cylinder block 3
Is provided with a needle bearing 5, and an actuator 6 is slidably inserted into a center bore 40 of the rear housing 4. The actuator 6 is biased by a coil spring 7 so as to move toward the front cylinder block 3.

The central portion of the rotary main shaft 8 is rotatably supported by the front cylinder block 3 via a needle bearing 5, and its rear end is rotatably supported by the rear cylinder block 4 via an actuator 6. ing. A swash plate 9 having a variable tilt angle is attached to the rotary main shaft 8, and the swash plate 9 is engaged with the actuator 6 via a connecting body 10 and a thrust needle bearing 11. Further, a rotor 12 is fixed to the rotary main shaft 8, and a swash plate 9 is connected to the rotor 12 with a variable tilt angle. Rotation of the rotary main shaft 8 is transmitted to the swash plate 9 via the rotor 12. Is made to do.

One end of the double-headed piston 13 is slidably inserted into the cylinder bore 31 of the front cylinder block 3, and the other end is slidably inserted into the cylinder bore 41 of the rear cylinder block 4. The double-headed piston 13 is connected to the swash plate 9 with a hemispherical shoe 14 interposed.

On the end surface of the front cylinder block 3,
A front housing 16 is attached with the valve plate device 15 interposed therebetween, and the front housing 16 constitutes an intake chamber 160 and a discharge chamber 161.
Further, the valve plate device 1 is provided on the end surface of the rear cylinder block 4.
A rear housing 18 is attached with the interposition of 7, and the rear housing 18 constitutes an intake chamber 180, a discharge chamber 181, and a control chamber 182. The pressure in the control chamber 182 is adjustable by the communication control between the control chamber 182 and the suction chamber 180 and the communication control between the control chamber 182 and the discharge chamber 181. The control room 182 is
The pressure in the center bore 40 is equal to the pressure in the control chamber 182.

FIG. 2 is a vertical cross-sectional view of the main part of the variable capacity swash plate compressor shown in FIG. Referring also to FIG. 2, a groove 60 is formed on the outer peripheral surface of the actuator 6, and an O-ring 19 that seals between the actuator 6 and the rear cylinder block 4 is arranged in the groove 60. Further, grooves 61 and 62 are formed on the outer peripheral surface of the actuator 6, and the first sealing ring 20 is arranged in the groove 61.
A second sealing ring 21 is arranged in the. These first and second sealing rings 20 and 21 are mounted on the actuator 6 so as to be located on both sides of the O-ring 19, and therefore the O-ring 19 is just the first and the second.
It is configured to be inserted into the sealing rings 20 and 21 of. Thus, the O-ring 19 and the first sealing ring 2 are provided between the actuator 6 and the rear cylinder block 4.
It is sealed by 0 and a second sealing ring 21. The structure of the first and second sealing rings 20 and 21 is the same as that of the piston ring.
A material having excellent abrasion resistance is used, and in this embodiment, a tetrafluoroethylene polymer plastic is used.

As described above, the actuator 6 is designed to receive the pressure in the control chamber 182. Therefore, by changing the pressure in the control chamber 182, the actuator 6 is moved toward the swash plate 9. Alternatively, it is adapted to move toward the rear housing 18. Due to the movement of the actuator 6, the inclination angle of the swash plate 9 which engages with the actuator 6 via the connecting body 10 and the thrust needle bearing 11 is changed, whereby the stroke of the double-headed piston 13 is changed, and as a result, the compressor Made to vary in capacity.

FIG. 3 is a vertical cross-sectional view of an essential part of a variable displacement swash plate compressor according to a second practical example of the present invention.

The variable capacity swash plate type compressor of the present embodiment is the first
And the second sealing rings 20 and 21 are the same as those of the variable capacity swash plate compressor of the first embodiment.

In this embodiment, the first sealing ring 20
The side edge of the swash plate is in close contact with the bottom surface of the groove 61, the O-ring 19 side edge of the first sealing ring 20 is raised from the bottom surface of the groove 61, and the second sealing ring 21 The rear housing side edge of is closely attached to the bottom surface of the groove 62,
The O-ring 19 side edge of the second sealing ring 21 has a groove 62.
Is raised from the bottom of the.

FIG. 4 is a vertical cross-sectional view of an essential part of a variable displacement swash plate compressor according to a third practical example of the present invention.

The variable capacity swash plate compressor of this embodiment is also the first
And the second sealing rings 20 and 21 are the same as those of the variable capacity swash plate compressor of the first embodiment.

In the case of this embodiment, the first sealing ring 20 is used.
The side edge of the swash plate of the first sealing ring 20 is raised from the bottom surface of the groove 61, the side edge of the O-ring 19 of the first sealing ring 20 is in close contact with the bottom surface of the groove 61, and the second sealing ring 21 The rear housing side edge of is raised from the bottom surface of the groove 62, and the O-ring 19 side edge of the second sealing ring 21 is
It is in close contact with the bottom surface of the groove 62.

FIG. 5 is a vertical cross-sectional view of an essential part of a variable displacement swash plate type compressor according to a fourth practical example of the present invention.

The variable capacity swash plate type compressor of this embodiment is also the first
And the second sealing rings 20 and 21 are the same as those of the variable capacity swash plate compressor of the first embodiment.

In the case of this embodiment, the first sealing ring 20 is used.
The side edge of the swash plate is in close contact with the bottom surface of the groove 61, the O-ring 19 side edge of the first sealing ring 20 is raised from the bottom surface of the groove 61, and the second sealing ring 21 The rear housing side edge of is raised from the bottom surface of the groove 62, and the O-ring 19 side edge of the second sealing ring 21 is
The bottom surface of the groove 62 is in close contact.

Although the above-mentioned embodiments are all double-headed piston type variable displacement swash plate type compressors, the present invention also applies to a general variable displacement swash plate type compressor equipped with an actuator and one cylinder block. Applicable.

[0028]

In the variable capacity swash plate type compressor of the present invention, by disposing the sealing rings on both sides of the O-ring, the sliding characteristics of the actuator and the sealing performance are improved, and the discharge capacity is controlled. It can be done reliably over a long period of time.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a variable capacity swash plate compressor according to a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a main part of the variable capacity swash plate compressor shown in FIG.

FIG. 3 is a vertical cross-sectional view of a main part of a variable capacity swash plate compressor according to a second practical example of the present invention.

FIG. 4 is a vertical cross-sectional view of an essential part of a variable capacity swash plate compressor according to a third practical example of the present invention.

FIG. 5 is a vertical cross-sectional view of a main part of a variable capacity swash plate compressor according to a fourth practical example of the present invention.

FIG. 6 is a vertical sectional view of an example of a conventional variable capacity swash plate compressor.

[Explanation of symbols]

 3 Front Cylinder Block 4 Rear Cylinder Block 6 Actuator 19 O-ring 20 First Sealing Ring 21 Second Sealing Ring

Claims (2)

[Claims] 1. A cylinder block having a center bore, an actuator slidably inserted in the center bore, and an O mounted on an outer peripheral surface of the actuator to seal between the actuator and the cylinder block.
A variable capacity swash plate compressor including a ring,
A variable capacity swash plate compressor, wherein a sealing ring is attached to the actuator so as to sandwich the ring. 2. The variable capacity swash plate compressor according to claim 1, wherein the material of the sealing ring is a tetrafluoroethylene polymer plastic.