JPH07279840A - Swash type variable displacement compressor - Google Patents

Abstract

PURPOSE:To provide a swash type variable displacement compressor for improving durability and providing proper strokes of a piston. CONSTITUTION:A swash type variable displacement compressor has a plurality of cylinder bores, a piston 5, a rotary main shaft 4, a cam plate 8 provided with support lug 8c disposed on respective sides for converting torque of the rotary main shaft 4 into reciprocating power of the piston or a guide lug 8a, an actuator 13 for sliding axially, a coupler 9 which is axially slidable and which can adjust stroke of the piston 5 through a contact part of the guide lug 8a and a rotor arm 14 turnably coupled with the support lug 8c. Inclination of the cam plate 8b is controlled through the coupler 9 by sliding the actuator 13 to an axial direction of the rotary main shaft 4 and the stroke of the piston 5 is variably controlled. A sliding member mounted a guide lug receiving surface on one of surfaces is held between a tip part 8b of the guide lug and the coupler 9 or a guide lug holding surface of the rotor arm 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerant compressor used for air conditioning of a vehicle or the like, which is a swash plate type variable displacement compressor for controlling a tilt angle of a swash plate to change a reciprocating stroke of a piston. It is about machines.

[0002]

2. Description of the Related Art Conventionally, as this type of swash plate type variable displacement compressor, the invention described in Japanese Patent Application Laid-Open No. 5-321144 shown in FIG. 3 is known.

This swash plate type variable displacement compressor has a cylindrical cylinder block 1, one end surface of which is closed by a rear housing 2 and the other end surface of which is closed by a front housing 3. At the center of the block 1, a rotary main shaft 4 that penetrates through the front housing 3 is arranged. Also, this cylinder block 1
A plurality of cylinder bores 6 accommodating a double-headed piston 5 are arranged around the main spindle 4 inside. The double-headed piston 5 is linked to the rotary main shaft 4 via a shoe 7, a swash plate 8 and a connecting body 9. The rotary motion of the rotary main shaft 4 is converted into a reciprocating motion of the double-headed piston 5 to suck and compress the refrigerant. It is carried out.

In the compressor thus constructed, a stroke adjusting structure of the double-headed piston 5 is adopted as a structure for controlling the discharge capacity of the refrigerant.

That is, this stroke adjusting structure guides the refrigerant discharged from the discharge chamber 10 in the rear housing 2 to the pressure adjusting chamber 12 of the rear housing 2 through, for example, the orifice 15, and controls the pressure of the pressure adjusting valve 11. As a result, the pressure in the pressure control chamber 12 increases or decreases. And the pressure control chamber 1
The actuator 13 slides in the axial direction of the rotary spindle 4 by receiving the gas pressure of 2 and the axial force of the pressing spring 16. As the actuator 13 slides, the swash plate 8 comes into contact with the upper surface 9b of the flange 9a of the connector 9 which is the contact surface with the guide ears, via the guide ear tip 8b of the guide ear 8a.
Is inclined according to the amount of movement of the connecting body 9. On the other hand, with the inclination of the swash plate 8, the pin 8d connected to the support ear 8c
Moves along the long hole 14b formed in the arm 14a of the rotor arm 14. Thereby, the angle of the swash plate 8 is controlled.

According to this stroke adjusting structure, the pressure adjusting valve 11 is closed when the discharge capacity is increased. As a result, the internal pressure of the pressure control chamber 12 increases, and the actuator 13 slides to the right as viewed in FIG. Along with this, the connecting body 9 moves to the right, and the swash plate 8 moves to the right.

When the swash plate 8 moves, the pin 8d connected to the support ear 8c moves obliquely downward in FIG. 3 along the long hole 14a (FIG. 3 shows the state when the discharge capacity is increased. Shown). As the connecting pin 8d moves obliquely downward, the inclination angle of the swash plate 8 increases, which increases the stroke of the double-headed piston 5.

On the other hand, when reducing the discharge capacity, the pressure control valve 11 is opened contrary to the above. As a result, the internal pressure in the pressure adjusting chamber 12 becomes low, the pin 8d moves diagonally upward toward FIG. 3, and the inclination angle of the swash plate 8 becomes small. Further, guide ears are provided on both side surfaces of the swash plate 8 to provide a support structure for adjusting the stroke.

[0009]

In the swash plate type variable displacement compressor of the prior art described above, stroke adjustment of the double-headed piston is performed by controlling the inclination angle of the swash plate. The support structure for the stroke adjustment is a swash plate. Supporting ears, placed in
It is performed by the guide ear, the connecting body, the pin, the long hole, or the guide ear only.
The respective members were mainly made of iron.

In this case, when the inclination angle of the swash plate is changed, there are problems that seizure occurs in the contact portion of each member and wear is accelerated. In particular, since the periphery of the contact portion between the guide ear and the upper surface of the coupling body is open, there is a problem that abrasion due to backlash is likely to occur.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to prevent seizure and wear between the contact portion between the guide ear and the upper surface of the coupling body.

[0012]

In order to solve the above-mentioned problems, the invention of claim 1 comprises a plurality of cylinder bores, a piston reciprocating in the cylinder bores, and a rotary main shaft arranged in parallel with the cylinder bores. A swash plate having a support ear or a guide ear on each side surface that is connected to the rotation main shaft and converts the rotational force of the rotation main shaft into reciprocating power of the piston, and slides in the axial direction along the rotation main shaft. An actuator, a connecting body that is installed on the rotating main shaft, is slidable in the axial direction, and is capable of adjusting the stroke of the piston via a contact portion with the guide ear, and the rotating main shaft on the supporting ear side. A tilted angle of the swash plate that is fixed and that includes a rotor arm that is rotatably connected to the support ear and that slides the actuator in the axial direction of the rotation main shaft through the connecting body. In the swash plate type variable displacement compressor which controls and variably controls the stroke of the piston, a guide ear receiving surface is provided on one surface between the tip portion of the guide ear and the guide ear contacting surface of the connecting body. The configuration is such that the provided sliding member is sandwiched.

According to the second aspect of the invention, between the tip of the guide ear provided on one surface of the swash plate and the rotor arm having the contact surface with the guide ear in the axial direction and the rotation direction, A sliding member having a guide ear receiving surface on one surface is arranged.

Further, according to the invention of claim 3, a lubricating groove is formed in the sliding member.

The inventions of claims 4 and 5 are
The sliding member was made of alloy or ceramics.

[0016]

According to the present invention, the coupling body moves along the axial direction of the rotating main shaft due to the sliding of the actuator caused by the gas pressure in the pressure adjusting chamber and the pressing spring. At this time, the swash plate with which the tip of the guide ear is in contact with the upper surface of the flange portion of the connecting body via the sliding member is inclined according to the amount of movement of the connecting body. On the other hand, with the inclination of the swash plate, the pin of the swash plate moves along the long hole of the rotor arm, and the tip of the supporting ear extends along the upper surface of the flange portion of the rotor arm via the sliding member. Moving. With this, when the setting of the tilt angle of the swash plate is completed and the rotation main shaft rotates, the swash plate causes the piston to reciprocate under the tilt angle thus set, thereby sucking and sucking gas.
Perform compression.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention is shown in FIG. 1 (hereinafter, the same members as those in the prior art will be designated by the same reference numerals). In the present invention, the support ear is provided on the side of the rotor arm 14 of the swash plate 8 so as to project, and the elongated hole 14 of the arm 14a of the rotor arm 14
A member having a pin 8d that slides in b. Further, the guide ears are members that are provided on each side surface of the swash plate 8 so as to be in contact with the upper surface 9b of the connecting body 9 or the flange portion 14c of the rotor arm 14. The drive ear means the rotor arm 14
A member protruding from the flange portion 14c and contacting the guide ear. The holding ear means a member protruding from the upper surface 9b of the connecting body 9 and in contact with the guide ear.

The swash plate 8 has a support ear 8c protruding from one surface thereof, and is rotatably connected to a long hole 14b formed in an arm 14a of a rotor arm 14 fixed to the rotary main shaft 4 via a pin 8d. Supported. A guide ear 8 a projects from the other surface of the swash plate 8. The guide ear tip portion 8b is a flange portion 9 of the connecting body 9 that is loosely engaged with the rear portion 4a of the rotary spindle 4.
The swash plate 8 is supported by the sliding member 20 arranged on the contact surface with the guide ears between the holding ears 9c projecting to a, and supports the swash plate 8 in the direction of the main axis of rotation.

The rear surface 9d of the flange portion 9a of the connecting body 9 is
The thrust bearing 30 is supported in the direction of the rotary main shaft 4, and the thrust bearing 30 is supported in the direction of the rotary main shaft 4 by the actuator 13 and transmits the axial force of the rotary main shaft 4 from the actuator 13 to the coupling body 9. .

The actuator 13 receives the gas pressure in the pressure adjusting chamber 12 on the back surface thereof and the axial force of the pressing spring 16 to generate a necessary axial force.

High-pressure gas from the discharge chamber 10 flows into the pressure control chamber 12 on the back surface of the actuator 13 via a means such as an orifice 15, and the pressure control valve 11 is opened / closed to cause the inside of the pressure control chamber 12 to move. The gas pressure of
It is released to the low pressure side of the suction chamber 40. Therefore, by adjusting the opening degree of the pressure control valve 11, the pressure in the pressure control chamber 12 can be set to an arbitrary pressure between the suction pressure and the discharge pressure. The pressure control valve 11 may be of various types such as a type that detects gas pressure and self-controls, a type that is controlled by an electric signal from the outside, and the like. or,
The pressure adjusting valve 11 may adjust the intake amount from the discharge side, or may adjust both, instead of adjusting the escape amount of gas.

With the above structure, the gas pressure in the pressure adjusting chamber 12 is adjusted to change the axial force of the actuator 13 and control the inclination angle of the swash plate 8.

By controlling the inclination angle of the swash plate 8, the swash plate 8 that rotates via the rotor arm 14 that rotates together with the rotating main shaft 4 that receives a driving force from the outside (for example, an engine) rotates through the shoe 7. The double-headed piston 5 is reciprocated by an arbitrary stroke. At this time, the coupling body 9 rotates together with the rotary main shaft 4, but receives an axial force from the actuator 13 that is substantially stationary via the thrust bearing 30.

The actuator 13 is provided with a lubricating hole 50 for supporting the rear portion 4a of the rotary main shaft 4 in a shaft manner. A lubricating passage 60 is provided on the front side of the rotary spindle 4.
Supply lubricating oil to rotating and sliding parts. The connector 9 has a pair of holding ears that hold the guide ears. The holding ear 9c
The guide ear 8a and the guide ear 8a can be provided on both the swash plate 8 and the connecting body 9, respectively.

Next, a second embodiment of the present invention is shown in FIG.
The rotor arm 14 has a flange portion 14c, and the swash plate 8 is interposed via the sliding member 20 arranged on the guide ear contact surface between the drive ears 14d protruding from the flange portion 14c.
The guide ears 8e of the guide ears 8e projecting toward the rotor arm 14 are abutted to support the axial force generated in the swash plate 8 and give a rotational torque to the swash plate 8. The drive ear 14d and the guide ear 8e can be provided on both the rotor arm 14 and the swash plate 8.

Next, a first embodiment of the sliding member of the present invention is shown in FIG. 4 (a). The sliding member 20 is provided with a curved surface 20a for sliding the guide ears 8a and 8e on one surface.

Next, a second embodiment of the sliding member of the present invention is shown in FIG. 4 (b). The sliding member 20 is provided with a curved surface 20a for sliding the guide ears 8a, 8e and a lubricating groove 20b on one surface.

Next, a third embodiment of the sliding member of the present invention is shown in FIG. 4 (c). The sliding member 20 is provided with a curved surface 20a for sliding the guide ears 8a and 8e on one surface and a lubricating groove 20c on the other surface.

Next, a fourth embodiment of the sliding member of the present invention is shown in FIG. 4 (d). The sliding member 20 has, on one surface, a curved surface 20a for sliding the guide ears 8a, 8e and a lubricating groove 20b.
However, the lubricating groove 20c is provided on the other surface.

The material of the sliding member is preferably aluminum alloy, copper alloy, ceramics or the like.

[0031]

As described above, according to the present invention,
It is possible to suppress wear and seizure of a member that changes the stroke of the piston, improve durability, and obtain an accurate piston stroke.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a swash plate type variable displacement compressor showing a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a swash plate type variable displacement compressor showing a second embodiment of the present invention.

FIG. 3 is a block diagram of a conventional swash plate type variable displacement compressor.

FIG. 4 is a perspective view showing an embodiment of a sliding member of the present invention.

[Explanation of symbols]

1 ... Cylinder block, 2 ... Rear housing, 3 ... Front housing, 4 ... Rotating spindle, 5 ... Double-headed piston, 6
... Cylinder bore, 7 ... Shoe, 8 ... Swash plate, 8a ... Guide ear, 8b ... Guide ear tip, 8c ... Support ear, 8d ... Pin, 8e ... Guide ear, 8f ... Guide ear tip, 9 ... Linked body, 9c ... holding ear, 10 ... discharge chamber, 11 ... pressure control valve,
12 ... Pressure control chamber, 13 ... Actuator, 14 ... Rotor arm, 14a ... Arm, 14d ... Drive ear, 15 ...
Orifice, 16 ... Pressing spring, 20 ... Sliding member, 20
a ... Curved surface, 20b ... Lubrication groove, 20c ... Lubrication groove, 30 ... Thrust bearing, 40 ... Suction chamber, 50 ... Lubrication hole, 60
... Lubrication path

Claims (5)

[Claims] 1. A plurality of cylinder bores, a piston that reciprocates in the cylinder bore, a rotary main shaft that is arranged in parallel with the cylinder bore, and a rotary force of the rotary main shaft that is connected to the rotary main shaft to reciprocate between the pistons. A swash plate having support ears or guide ears on each side for converting to power, an actuator that slides in the axial direction along the rotation main shaft, and is installed on the rotation main shaft and is slidable in the axial direction. A connecting body capable of adjusting the stroke of the piston via a contact portion with the guide ear, and a rotor arm fixed to the rotating main shaft on the supporting ear side and rotatably connected to the supporting ear are provided. By sliding the actuator in the axial direction of the rotating main shaft, the inclination angle of the swash plate is controlled via the connecting body, and the stroke of the piston is variably controlled. In the variable displacement compressor, a sliding member having a guide ear receiving surface on one surface is sandwiched between a tip end portion of the guide ear and a guide ear contacting surface of the connector. Swash plate type variable capacity compressor. 2. A guide ear receiver on one surface between a tip end portion of a guide ear provided on one surface of the swash plate and a rotor arm having a contact surface with a guide ear in the axial direction and the rotation direction. The swash plate type variable displacement compressor according to claim 1, wherein a sliding member having a surface is arranged. 3. The swash plate type variable displacement compressor according to claim 1, wherein a lubricating groove is formed in the sliding member. 4. The swash plate type variable displacement compressor according to claim 1, wherein the sliding member is made of an alloy. 5. The swash plate type variable displacement compressor according to claim 1, wherein the sliding member is made of ceramics.