JPH064377U - Compressor thrust bearing holding structure - Google Patents

Abstract

(57) [Summary] [Purpose] The rotation of the housing side race of the thrust bearing is stopped to prevent abrasion of the race receiving surface of the housing and to stabilize the rotation of the shaft. [Structure] Thrust flange 4 fixed to shaft 5
0 is applied to the race receiving surface 37 of the inner wall of the front head 4 via the thrust bearing 33, and the annular race 35 on the front head 4 side of the thrust bearing 33 is provided with a projecting piece 35a projecting in the radial direction. Ribs 48 for holding
The a and 48b are provided on the inner wall of the front head 4. Even if the race 35 on the front head 4 side of the thrust bearing 33 tries to rotate as the thrust flange 40 rotates, the rotation of the race 35 on the front head 4 side is prevented by the projecting piece 35a held between the ribs 48a and 48b.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a thrust bearing holding structure for a compressor, for example, a thrust bearing holding structure that prevents the race of the thrust bearing from rotating around during thrust flange rotation.

[0002]

[Prior art]

 In the conventional oscillating plate type compressor, as shown in FIG. 9, a thrust flange 40 is fixed to the shaft 5, and the strike flange 40 is abutted against the inner wall of the front head 4 via a thrust bearing 133 (actually). Japanese Patent Application No. 3-45937).

When the shaft 5 rotates, the thrust flange 40 also rotates, and the thrust bearing 133 receives the load of the thrust flange 40 acting in the axial direction.

[0004]

[Problems to be solved by the device]

 However, the race 135 is rotated by the frictional force between the needle roller 34 of the thrust bearing 133 and the race 135, and the race receiving surface 37 of the non-ferrous (eg, aluminum) front head 4 is worn by the rotation of the ferrous race 135. However, as the wear progresses, the rotation of the shaft 5 becomes unstable, preload is reduced, and moving parts in the compressor may be adversely affected.

The present invention has been made in view of such circumstances, and its problem is a thrust of a compressor capable of stopping the rotation of the housing side race of the thrust bearing and preventing the wear of the race receiving surface of the housing. A bearing holding structure is provided.

[0006]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the thrust bearing holding structure of the compressor of the present invention applies a rotating body fixed to a rotating shaft to the inner wall of the housing via the thrust bearing, and to the annular race on the housing side of the thrust bearing. A stopper portion that projects in the radial direction is provided, and a rib that holds the stopper portion is provided on the inner wall of the housing.

[0007]

[Action]

 As described above, the housing race of the thrust bearing is provided with the stopper that protrudes in the radial direction, and the rib that holds this stopper is provided on the inner wall of the housing. Even if it tries to rotate, the stoppers sandwiched by the ribs prevent rotation of the housing side race.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a vertical sectional view of an oscillating plate compressor having a thrust bearing holding structure according to an embodiment of the present invention, and FIG. 1 is an enlarged sectional view showing the thrust bearing holding structure. A rear head 3 is fixed to one end surface of a cylinder block 1 of this compressor via a valve plate 2, and a front head (housing) 4 is fixed to the other end surface thereof.

The cylinder block 1 is provided with a plurality of cylinder bores 6 around the shaft (rotary shaft) 5 at regular intervals in the circumferential direction. A piston 7 is slidably housed in each of the cylinder bores 6.

A crank chamber 8 is formed in the front head 4, and a swing plate 10 that swings around a hinge ball 9 in synchronization with the rotation of the shaft 5 is accommodated in the crank chamber 8. There is. The swing plate 10 is connected to the piston 7 via a connecting rod 11, and the swing of the swing plate 10 causes the piston 7 to reciprocate in the cylinder bore 6. As the pressure in the crank chamber 8 decreases, the tilt angle of the rocking plate 10 increases, and conversely, as the pressure in the crank chamber 8 increases, the tilt angle of the rocking plate 10 decreases.

A discharge chamber 12 and a suction chamber 13 located around the discharge chamber 12 are formed in the rear head 3. The inside of the discharge chamber 12 is partitioned into a discharge space 12a and a discharge space 12b by a partition wall 14, and the discharge spaces 12a and 12b are communicated with each other through a throttle hole 14a formed in the partition wall 14.

The valve plate 2 is provided with a discharge port 16 for communicating the cylinder bore 6 with the discharge space 12 a and a suction port 15 for communicating the cylinder bore 6 with the suction chamber 13 at predetermined intervals in the circumferential direction. ing. The discharge port 16 is opened and closed by a discharge valve 17, and the discharge valve 17 is fixed to a rear head side end surface of the valve plate 2 together with a valve retainer 18 by a bolt 19, and the bolt 19 is inserted through a center hole 2a of the valve plate 2 into a cylinder block. It is screwed into one screw hole 20. Further, the suction port 15 is opened and closed by a suction valve 21, and the suction valve 21 is arranged between the valve plate 2 and the cylinder block 1.

The bolt 19 is provided with a guide hole 27 for guiding the high pressure working gas in the discharge space 12 a to the small diameter hole 22 of the cylinder block 1.

A screw hole 20, a small diameter hole 22 and a large diameter hole 23 which communicate with each other are provided in the center of the cylinder block 1 along the center line of the cylinder block 1. A radial bearing 24 is accommodated in the small diameter hole 22, and a thrust bearing 25 is accommodated in the large diameter hole 23. The radial bearing 24 and the thrust bearing 25 support the rear end of the shaft 5, and the front end of the shaft 5 is supported by a radial bearing 26 in the front head 4.

Further, the cylinder block 1 is provided with a communication passage 31 that communicates the suction chamber 13 and the crank chamber 8, and a pressure adjusting valve 32 is provided in the middle of the communication passage 31, and the pressure adjusting valve 32 is provided. The pressure between the suction chamber 13 and the crank chamber 8 is adjusted by.

A thrust flange (rotating body) 40 for transmitting the rotation of the shaft 5 to a drive hub 41 is fitted to an end portion of the shaft 5 on the front head side. The thrust flange 40 is mounted on the front head via a thrust bearing 33. It is supported on the race receiving surface 37 of the inner wall of No. 4. The lower part of the thrust flange 40 and the lower part of the drive hub 41 are rotatably connected via a link arm 42.

The swing plate 10 is rotatably attached to the drive hub 41. The center hole 41a of the drive hub 41 is in sliding contact with the outer circumference of the hinge ball 9 which is loosely fitted to the outer circumference of the shaft 5 and is slidably fitted to the outer circumference of a substantially middle portion of the shaft 5 in the axial direction. A spring 44 is provided on the outer circumference of the shaft 5 between the hinge ball 9 and the thrust flange 40, and the spring 44 urges the hinge ball 9 toward the cylinder block 1. A stopper 45 is provided so as to protrude from the shaft 5 on the cylinder block 1 side of the hinge ball 9, and a plurality of disc springs 46 and a coil spring 47 are sequentially arranged on the outer periphery of the shaft 5 between the stopper 45 and the hinge ball 9. The hinge ball 9 is urged toward the thrust bearing 33 by these springs 46 and 47.

As shown in FIG. 1, the thrust bearing 33 includes a needle roller 34, an annular race (housing side race) 35 on the front head side that sandwiches the needle roller 34, and an annular race (rotation side on the thrust flange side). Body side race) 36. The race 35 is fitted on the mounting step 38 of the front head 4 and is in contact with the race receiving surface 37. The race 36 is press-fitted into the mounting recess 39 of the thrust flange 40. Both races 35, 36 are made of ferrous metal.

As shown in FIGS. 3 and 4, the race 35 has a projecting piece (stopper portion) 35 a that projects in the radial direction.

On the other hand, as shown in FIG. 5, the front head 4 formed of a non-ferrous metal (for example, aluminum or the like) is integrally formed with a pair of ribs 48a and 48b for sandwiching the projecting piece 35a from both sides. . A pair of oil separating recesses 49 (see FIG. 7) and a recess 50 (see FIG. 8) are provided in the upper portion of the inner wall surface of the front head 4, and oil grooves 51, 52 communicating with the recesses 49, 50 are provided. It is provided on the race receiving surface 37. The oil grooves 51 and 52 communicate with the oil supply paths 53 and 54 as shown in FIG.

Next, the operation of the oscillating plate compressor will be described.

When the rotational power of the vehicle-mounted engine (not shown) is transmitted to the shaft 5, the shaft 5 rotates together with the thrust flange 40 and the drive hub 41, and the rocking plate 10 rocks with the rotation, and this rocking occurs. The piston 7 moves back and forth in the cylinder bore 6 due to the movement, and the volume in the cylinder bore 6 changes. This change in volume causes the refrigerant gas to be sequentially sucked, compressed, and discharged, depending on the tilt angle of the oscillating plate 10. High-pressure refrigerant gas with a large volume is discharged.

That is, when the heat load is reduced and the pressure regulating valve 32 closes the communication passage 31 and the pressure in the crank chamber 8 is increased, the inclination angle of the oscillating plate 10 is reduced, which reduces the stroke amount of the piston 7. The discharge capacity decreases and the discharge capacity decreases. At this time, the high-pressure refrigerant gas in the discharge space 12a is guided into the small diameter hole 22 through the guide hole 27 of the bolt 19 and into the crank chamber 8 through the large diameter hole 23, so that the crank chamber 8 The internal pressure rise is promoted, and at the same time, the radial bearing 24 and the thrust bearing 25 are lubricated.

When the heat load increases and the pressure regulating valve 32 opens the communication passage 31 and the pressure in the crank chamber 8 decreases, the tilt angle of the oscillating plate 10 increases, which increases the stroke amount of the piston 7. The discharge capacity increases.

When the thrust flange 40 rotates as the shaft 5 rotates, a load in the thrust direction is applied to the thrust bearing 33, and the race 35 on the front head 4 side of the thrust bearing 33 tries to rotate as the thrust flange 40 rotates. However, since the projecting piece 35a of the race 35 is sandwiched by the ribs 48a and 48b of the front head 4, the whirling of the race 35 is prevented. As a result, the race receiving surface 37 of the front head 4 can be prevented from being worn, and the rotation of the shaft 5 can be stabilized. Therefore, the moving parts such as the oscillating plate 10 are not adversely affected and the reliability of the compressor is improved. And quietness is obtained.

The refrigerant gas in the crank chamber 8 is oil-separated by the recesses 49, 50 of the front head 4, and the oil thereof passes through the oil grooves 51, 52 of the race receiving surface 37 and the oil supply passage 53, A part of the oil is supplied to the radial bearing 26 through the openings 54a and 54a provided in the oil supply path. Therefore, the sealing property of the seal portion 55 is complemented, and the radial bearing 26 is lubricated and the thrust bearing 33 is cooled.

In this embodiment, the case where the present invention is applied to a variable displacement type oscillating plate compressor has been described, but other types such as a fixed displacement type oscillating plate compressor and a swash plate compressor can be used. Even when it is applied to the compressor, it is possible to obtain the same effects as those of the above-described embodiment.

[0029]

[Effect of device]

 As described above, according to the thrust bearing holding structure of the compressor of the present invention, even if the housing side race of the thrust bearing tries to rotate as the rotating body rotates, the rotation of the housing side race is prevented by the stopper portion held by the rib. Is prevented, wear of the race receiving surface of the housing can be prevented, the rotation of the rotating shaft is stabilized, the quietness of the compressor is obtained, and there is no risk of adversely affecting the moving parts inside the compressor.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view showing a thrust bearing holding structure according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of an oscillating plate compressor having a thrust bearing holding structure according to an embodiment of the present invention.

FIG. 3 is a plan view showing a race on a front head side of a thrust bearing.

4 is a cross-sectional view taken along the line IV-IV in FIG.

FIG. 5 is a diagram showing an inner wall of a front head.

6 is a sectional view taken along line VI-VI in FIG.

7 is a cross-sectional view taken along the line VII-VII of FIG.

8 is a sectional view taken along line VIII-VIII in FIG.

FIG. 9 is a longitudinal sectional view of a conventional rocking plate compressor.

[Explanation of symbols]

 4 Front Head (Housing) 5 Shaft (Rotating Shaft) 33 Thrust Bearing 35 Race (Housing Side Race) 35a Projecting Piece (Stopper) 40 Thrust Flange (Rotating Body) 48a, 48b Rib

Claims (1)

[Scope of utility model registration request] 1. A rotary body fixed to a rotary shaft is applied to an inner wall of a housing via a thrust bearing, and a stopper portion protruding in a radial direction is provided on an annular race on the housing side of the thrust bearing, and the stopper portion is sandwiched. A thrust bearing holding structure for a compressor, characterized in that ribs are provided on the inner wall of the housing.