JP2564122Y2 - Variable capacity swinging swash plate type compressor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable displacement swash plate type compressor (hereinafter simply referred to as a compressor).
The present invention relates to an improvement of a compressor in which a thrust bearing is arranged in front and rear and a swing plate is attached to a swash plate.

[0002]

2. Description of the Related Art A conventional compressor is disclosed in
JP-A-8670 and JP-A-1-127406 are known. As shown in FIG. 5, in this compressor, a drive shaft 93 penetrates a crank chamber 92 formed by a housing 90 and a cylinder block 91 and is rotatably supported.
A swash plate 96 is tiltably supported via a sleeve 95. A swing plate 97 is attached to the swash plate 96 in a rotation-restricted state with thrust bearings 81 and 82 disposed before and after the swing plate 97. A piston (not shown) is attached to the swing plate 97 via a piston rod 98. Is moored, so that the piston is moved to the cylinder block 91 in accordance with the inclination angle of the swing plate 97.
Is reciprocable within the bore 91a. In this compressor, the crank chamber pressure is adjusted by a control valve (not shown), and the stroke of the piston is changed according to the pressure difference between the crank chamber pressure and the suction pressure, whereby the inclination of the rocking plate 97 is increased. The angle changes to control the compression capacity.

In such a compressor, the front thrust bearing 81 receives a forward thrust force due to the compression reaction force of the piston, and the rear thrust bearing 82 receives a rearward thrust force due to the suction reaction force of the piston. I have. When the pressure in the crank chamber is increased by adjusting the control valve, the suction pressure acting on the swing plate 97 also increases proportionally. Therefore, the rear thrust bearing 82 becomes larger as the compressor shifts to the small capacity operation side. It will receive a thrust force.

[0004]

[Problems to be Solved by the Invention] Among the compressors of this type which have been already proposed, there is also known a configuration in which instead of the above-described thrust bearing, a pressure receiving system using a washer is simply employed. In view of this, the tendency to rely on thrust bearings is increasing. However, as seen in the compressor described in the above publication, there is no detailed description of the rear thrust bearing and the mounting configuration thereof, and it is presumed that the rear thrust bearing does not fall out of a very general configuration. FIG. 6 shows an example of this, which is performed by firstly attaching a thrust bearing 82 in which a retainer having an inner ring 83, a roller 84, and an outer ring 85 are combined. In this case, the inner ring 83 is first fixed to the rocking plate 97, and a retainer having rollers 84 is provided in the inner ring 83. The outer ring 8 faces the inner ring 83 and the retainer.
5 are provided. A receiving seat 86 is fitted to the rear of the outer ring 85 so as to receive a rearward thrust force acting on the outer ring 85 from the outer ring 85, and a lock nut 88 is inserted into the swash plate 96 with a washer 87 behind the receiving seat 86. Screw together.
In the washer 87, a tongue piece 87 a extending inwardly is fitted into a straight groove 96 a of the swash plate 96, and at least one tooth piece 87 b extending a plurality of radially is engaged with a notch groove 88 a of the lock nut 88. Lock nut 8
Detain 8.

[0005] In the compressor equipped with the rear thrust bearing 82, a retainer having an inner ring 83 and a roller 84 is provided.
The five members of the outer ring 85, the receiving seat 86, and the washer 87 are connected to the swash plate 96.
Swash plate 96 in the axial direction. For this reason, in this compressor, the size of the compressor has been increased in order to avoid interference between the swash plate 96 and the cylinder block 91, and for example, the mountability on a vehicle may not be sufficient. In addition, the heavy mounting of five members increases the number of parts, increases the manufacturing cost of the compressor, and has a disadvantage that it is difficult to assemble the compressor.

[0006] The present invention is to shorten the swash plate in the axial direction,
It is an issue to be solved to reduce the number of parts.

[0007]

In order to solve the above-mentioned problems, the compressor of the present invention has a front thrust bearing and a rear thrust bearing, and a swing plate is attached to a swash plate. In the compressor, the rear thrust bearing is disposed on the rocking plate side.
An inner ring, an outer ring disposed on the lock nut side,
And a roller that rolls between the wheel and the outer wheel, the outer ring, the <br/> straight grooves formed in the swash plate to protrude to the inner circumferential side from the rolling surface of the <br/> rollers A tongue piece to be fitted , extending from the rolling surface to the outer peripheral side,
The present invention employs a novel means that has a tooth piece that bends into engagement with a notch groove formed in the lock nut and engages the lock nut.

[0008]

In the compressor of the present invention, the outer ring of the rear thrust bearing causes the rollers to roll on the rolling surface, and the tongue pieces projecting inward from the rolling surface fit into the straight grooves of the swash plate. At least one of the plurality of teeth extending radially from the rolling surface is bent and engaged with the notch groove of the lock nut to lock the lock nut. For this reason, in this compressor, the outer ring that rolls the rollers also serves as a general receiving seat and washer, and it is not necessary to load the receiving seat and the washer behind the outer ring in the boss projecting direction of the swash plate. The swash plate can be shortened in the axial direction by the axial length of the receiving seat and the washer. In addition, the number of parts can be reduced by the number of receiving seats and washers.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. This compressor, as shown in FIG.
A front housing 2 is joined to one end face of the cylinder block 1, and a rear housing 4 is joined to the other end face via a valve plate (not shown). A drive shaft 6 is rotatably extended into a crank chamber 5 in the front housing 2, and a rotor 7 is fixed to the drive shaft 6. A long hole 7b is formed in the rotor 7, and a pin 8a extending from the swash plate 8 is slidably inserted into the long hole 7b. A sleeve 11 is inserted into the drive shaft 6 so that a pin 11a can protrude and slide in the axial direction. A swash plate 8 is pivotally supported on the pin 11a of the sleeve 11. Thus, the swash plate 8 is supported so as to be tiltable with respect to the drive shaft 6. A flat bearing 10 is interposed on the sliding surface of the swash plate 8 on the boss side, and a rocking plate 13 is moored before and after the swash plate 8 via thrust bearings 9 and 12 in a rotation-restricted state.

As shown in FIG. 2, the rear thrust bearing 12 includes an inner ring 31, a retainer having rollers 32, and an outer ring 33. As shown in FIG. 3, the outer ring 33 has one tongue 33b protruding inward from the annular rolling surface 33a, and 13 teeth 33c extending radially from the rolling surface 33a. . The rolling surface 33a and the tongue piece 33b are hardened, while the tooth pieces 33c are annealed. In the rear thrust bearing 12, the inner ring 31 is fixed to the rocking plate 13,
A retainer having a roller 32 is provided in the inner ring 31, and an outer ring 33 is provided facing the inner ring 31 and the retainer. At this time, the tongue piece 33b of the outer ring 33 is fitted into the straight groove 8a formed on the swash plate 8 in a single line. And, as shown in FIG.
Lock nut 3 having eight cutout grooves 34a formed on the outer circumference
4 and the lock nut 34 is screwed to the swash plate 8 behind the outer ring 33. At this time, among the thirteen pieces 33c of the outer ring 33, at least one piece 33c facing the eight notches 34a of the lock nut 34 is bent and engaged with the notches 34a.

As shown in FIG. 1, a piston rod 14 is moored to the swinging plate 13.
A piston (not shown) housed in the plurality of bores 1a of the cylinder block 1 is moored. A guide rod 16 is disposed in the crank chamber 5 in parallel with the drive shaft 6. The guide rod 16 is held by one end of the swing plate 13 so that the swing plate 13 is
It is slidable with respect to. A suction chamber and a discharge chamber (not shown) are formed in the rear housing 4. Refrigerant gas in the suction chamber communicating with the refrigeration circuit is supplied into the bore 1a via a suction valve and a suction port of a valve plate. The refrigerant gas compressed by the piston in the bore 1a is discharged to a discharge chamber via a discharge port and a discharge valve of a valve plate, and further sent to a refrigeration circuit.

A discharge chamber and a crank chamber 5 communicate with the cylinder block 1 and the rear housing 4, and a control valve 22 is provided.
An air supply passage 20 opened and closed is formed, and a bleed passage 21 opened and closed by a safety valve 23 which communicates the crank chamber 5 with the suction chamber. In the compressor configured as described above, the piston reciprocates in the bore 1a according to the inclination angle of the swing plate 13 due to the rotation of the drive shaft 6. At this time, the front thrust bearing 9 receives a forward thrust force due to the compression reaction force of the piston. At the same time, the rear thrust bearing 12 receives a rearward thrust force due to the suction reaction force of the piston. When the pressure in the crank chamber 5 reaches the maximum value by adjusting the control valve 22 and the safety valve 23, the swinging plate 13 brings the piston to the suction stage against the maximum crank chamber pressure.
In this case, a maximum rearward thrust force acts on the rocking plate 13, but the swash plate 8 receives the maximum rearward thrust force via the rear thrust bearing 12. And the swash plate 8
The sleeve 11 moves to the rear end along the drive shaft 6 while swinging the pin 11 a of the sleeve 11. For this reason, as shown in FIG. 1, the rocking plate 13 is inclined at the minimum inclination angle.

In this compressor, as shown in FIG. 2, the outer ring 33 of the rear thrust bearing 12 causes the roller 32 to roll on the rolling surface 33a and the tongue piece 33b.
Is fitted into the straight groove 8a of the swash plate 8, and at least one of the teeth pieces 33c is bent and engaged with the cutout groove 34a of the lock nut 34 to thereby lock the lock nut 34 . For this reason, in this compressor, the outer ring 33 for rolling the roller 32 also serves as a general receiving seat and washer, and the receiving seat and the washer are mounted in the boss projecting direction of the swash plate 8 behind the outer ring 32. It is not necessary to reduce the axial length of the compressor as a whole by the axial length of the receiving seat and the washer. Also, the number of parts is reduced by the number of receiving seats and washers.

Therefore, in this compressor, the axial length of the swash plate can be shortened by the axial length of the general receiving seat and washer while suitably receiving the rearward thrust force. In addition, the number of parts can be reduced by the number of receiving seats and washers. For this reason, the compactness of the compressor can improve, for example, its mountability on a vehicle.
In addition, the manufacturing cost of the compressor can be reduced, and the assembling can be easily performed.

In the compressor of the above embodiment, the outer race 33
Although the one in which the tooth pieces 33c are annealed after the entire hardening is employed, an outer ring in which the rolling surface 33a and the tongue piece 33b are hardened and the tooth pieces 33c are not hardened may be employed.

[0016]

As described above in detail, in the compressor of the present invention, since the outer ring for rolling the rollers also serves as a general receiving seat and a washer, the axial length of the receiving seat and the washer is used. The number of parts can be reduced by the number of receiving seats and washers at the same time.

Therefore, in this compressor, the compactness of the compressor makes it possible to improve the mountability on a vehicle, for example. Further, with this compressor, the manufacturing cost of the compressor can be reduced, and the assembly can be easily performed.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a compressor according to an embodiment.

FIG. 2 is an enlarged view of a main part of the compressor of FIG.

FIG. 3 is a plan view of an outer ring used in the compressor of FIG.

FIG. 4 is a plan view of a lock nut used in the compressor of FIG.

FIG. 5 is a partial cross-sectional view of a conventional compressor.

FIG. 6 is a sectional view of a main part showing a mounting structure of a general rear thrust bearing.

[Explanation of symbols]

5 ... Crank chamber 6 ... Drive shaft 7 ...
Rotor 11 ... Sleeve 8 ... Swash plate 9 ...
Front thrust bearing 12 ... Rear thrust bearing 1 ... Cylinder 1a
... bore 14 ... connecting rod 13 ... rocking plate 33
... Outer ring 32 ... Roller 8a ... Straight groove 33
b: tongue piece 34: lock nut 34a: notched groove 33
c ... tooth piece

Claims (1)

(57) [Scope of request for utility model registration] And 1. A rotation through the crank chamber rotatably supported by a drive shaft, a swash plate which is tiltably supported through the low motor to the drive shaft, the front thrust bearing and the rear thrust bearing arrangement A swinging plate attached to the swash plate in a rotation-restricted state, and linked with a plurality of pistons that move directly in the respective cylinder bores via a connecting rod; and the rear thrust bearing.
A lock nut sandwiching the rocking plate with the rocking plate, and the stroke of the piston is changed in accordance with the differential pressure between the crank chamber pressure and the suction pressure, whereby the tilt angle of the rocking plate changes to compress. In a displacement variable swing swash plate type compressor whose capacity is controlled, the rear thrust bearing is disposed on the swing plate side.
An inner ring, an outer ring arranged on the lock nut side,
And a roller that rolls between the inner ring and the outer ring, said outer ring,
The swash plate is formed on the swash plate so as to protrude inward from the rolling surface of the roller.
Tongue that fits into the straight groove and extends from the raceway to the outer circumference
A variable displacement swash plate type compressor , comprising: a notch formed in the lock nut; and a tooth piece that is bent and engaged with the lock nut to lock the lock nut.