JPH06346842A - Web plate type compressor - Google Patents

Abstract

PURPOSE:To provide a web plate type compressor which is easily manufactured and assembled, can be reduced in its weight, and is free from oscillations and noises caused by partial abrasion. CONSTITUTION:Guide pins 31, 32 each having oblique stance to an axis of a web plate 4 are supported to a piston 5. Conical cam followers 33, 34 are supported to the guide pins 31, 32 movably in their axial directions. Coil springs 35, 36 are arranged between the cam followers 33, 34 and the piston 5 for energizing the cam followers 33, 34 in the direction of the web plate 4. The cam followers 33, 34 are rotated while accurately following the rotation of the web plate 4, for preventing generation of partial load between the guide pins 31, 32 and the cam followers 33, 34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wave plate type compressor in which a piston is reciprocated by the rotation of a wave plate having a three-dimensional cam shape fixed on a rotary shaft.

[0002]

2. Description of the Related Art In a compressor in which a piston in a cylinder bore is reciprocated by the rotation of a swash plate, the number of reciprocation of the piston is only once for one rotation of the swash plate. To increase capacity, the compressor must be oversized.

Therefore, in recent years, a wave plate type compressor that solves the above problems has been proposed. In this wave plate type compressor, instead of the swash plate, a three-dimensional cam-like plate that wakes along the circumferential direction is used.

A conventional wave plate compressor, for example, the one disclosed in Japanese Utility Model Laid-Open No. 63-177672, has a double-headed piston 51 and a roller 52 made of a cylindrical roller rotatable as shown in FIG. Supported by. The roller 52 is engaged with the front and rear cam surfaces of the wave plate 53. Then, the displacement of the cam surface due to the rotation of the wave plate 53 is transmitted to the double-headed piston 51 via the roller 52. This causes the double-headed piston 51 to reciprocate. When the displacement curve of the cam surface of the wave plate 53 is a two-cycle curve, the double-headed piston 51 moves in two directions during one rotation of the wave plate 53.
Perform compression operation once. In the wave plate compressor described in this publication, the roller 52 is housed in the recess 55 formed in the double-headed piston 51. The recess 5
5, a leaf spring 54 is interposed between the roller 52 and the double-headed piston 51, and the elastic force of the leaf spring 54 urges the roller 52 toward the cam surface of the wave plate 53. As a result, the roller 52 always contacts the cam surface of the wave plate 53 and follows the displacement of the cam surface.

[0005]

However, in the wave plate type compressor described in the above publication, it is necessary to form the leaf spring 54 into a shape so as to be accommodated in the gap 56 between the recess 55 and the roller 52. Therefore, manufacturing the leaf spring 54 is troublesome.

Moreover, since the leaf spring 54 is arranged in the narrow gap 56, the amount of bending of the leaf spring 54 cannot be made large, and the spring load is hard to appear. If the spring load is forcibly expressed, it is necessary to assemble the leaf spring 54 in a state of being largely bent, or to use a thick and strong spring force, which makes the assembly very troublesome. Further, if a thick and strong spring force is used as the leaf spring, the leaf spring becomes heavy and it becomes difficult to reduce the weight of the compressor.

In addition, in order to allow the leaf spring 54 to bend, it is necessary to form a space between the leaf spring 54 and the recess 55 and between the roller 52 and both ends of the leaf spring 54. However, these spaces include the roller 5 including the inclination of the roller 52.
Allows 2 delusions. For this reason, not only vibration and noise are generated from the roller 52 during the operation of the compressor, but also uneven wear is generated in the roller 52, which causes vibration and noise as described above.

The present invention has been made in view of the above circumstances, and an object thereof is a wave plate type which can be easily manufactured and assembled, can be reduced in weight, and can prevent vibration and noise due to uneven wear. To provide a compressor.

[0009]

In order to achieve the above object, according to the first aspect of the invention, a cam follower of a piston is engaged with a three-dimensional cam-shaped wave plate supported on a rotation shaft, and the wave plate is rotated. In a wave plate compressor in which a piston reciprocates via a cam follower, a guide pin that is inclined with respect to the axis of the wave plate is supported on the piston, and the cam follower is supported by the guide pin. The gist of the present invention is that it is movably supported in the axial direction and that a biasing means for biasing the cam follower toward the wave plate is provided between the cam follower and the piston.

The gist of the second invention is that the cam follower has a conical shape. The gist of the third invention is that the cam follower has a spherical shape.

In a fourth aspect of the invention, the gist is that the cam follower is rotatably supported with respect to the guide pin. A fifth aspect of the present invention is characterized in that the cam follower is non-rotatably supported with respect to the guide pin.

[0012]

According to the present invention, the cam follower follows the displacement of the wave plate cam surface by the urging force of the urging means. At this time, since the cam follower is supported by the guide pin, it is possible to prevent uneven wear of the cam follower without being inclined from a predetermined posture. Further, a sufficient spring mounting space can be provided between the cam follower and the piston along the guide pin, and a normal coil spring can be used as the biasing means. Moreover, since the spring mounting space can be sufficiently secured, the amount of bending of the coil spring can be sufficiently secured, and the spring load can be surely exerted on the cam follower. Therefore, a coil spring having a large wire diameter and a large spring force is unnecessary. Further, since the cam follower has a conical shape, the cam follower rotates or slides accurately following the rotation of the wave plate, and an unbalanced load does not occur between the guide pin and the cam follower.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, a shaft 3 is rotatably supported via a bearing 19 on a pair of cylinder blocks 1 and 2 that are fastened and joined together, and a three-dimensional cam-shaped wave plate 4 is mounted on the shaft 3. It is fastened. A plurality of cylinder bores 1a and 2a forming a pair in the front and rear are arranged in the cylinder blocks 1 and 2 at equidistant angular positions around the shaft 3, and a double-headed piston 5 is slidably fitted into the cylinder bores 1a and 2a. Has been done.

A front housing 8 and a rear housing 9 are arranged on the outer end surfaces of the cylinder blocks 1 and 2 with valve plates 6 and 7 interposed therebetween.
It is clamped and fixed together with the cylinder blocks 1, 2. Both housings 8 and 9 communicate with the wave plate chamber 12 and also with suction chambers 13 and 14 that communicate with the cylinder bores 1a and 2a through the suction valve 20 and with the cylinder bores 1a and 2a through the discharge valve 21. The discharge chambers 15 and 16 are partitioned and formed. The wave plate chamber 12 is connected to the outlet of an evaporator (not shown) of the refrigeration circuit.

As shown in FIGS. 1 and 3, recesses 5a are formed in the piston 5 at positions facing the front and rear cam surfaces S1 and S2 of the wave plate 4, respectively. Guide pins 31 and 32, one end of which faces the outer upper surface of the piston 5 and the other end of which faces the cam surfaces S1 and S2 of the wave plate 4, are obliquely supported with respect to the axis L above and below both sides of the recess 5a. Has been done. Both guide pins 3
Cone-shaped cam followers 33 and 34 are rotatably supported by 1 and 32, respectively. Both cam followers 3
Between 3 and 34, the cam surfaces S1 and S2 on both sides of the wave plate 4 are engaged.

Further, circumferential grooves 33a and 34a are formed on the large diameter surfaces of the cam followers 33 and 34, respectively.
One end side of coil springs 35 and 36 as biasing means inserted in the guide pins 31 and 32 is accommodated in 34a. Therefore, the cam followers 33 and 34 are always urged downward by the elastic force of the coil springs 35 and 36. That is, the peripheral surfaces 33b and 34b of the cam followers 33 and 34 are always in contact with the cam surfaces S1 and S2 of the wave plate 4 while being biased by the elastic force of the coil springs 35 and 36.

Next, the operation of the wave plate type compressor configured as described above will be described. When the wave plate 4 rotates as the shaft 3 rotates, the double-headed piston 5 reciprocates back and forth in the cylinder bores 1a and 2a via the cam followers 33 and 34 due to the cam action, thereby sucking, compressing and discharging the fluid. Is done.

At this time, the cam followers 33 and 34 follow the displacement of the cam surfaces S1 and S2 by the urging force of the coil spring 35 and rotate about the guide pin 31, but the cam followers 33 and 34 are guided by the guide pins 31 and 34. 32
Since it is supported by the guide pins 31, the guide pins 31 and 32 do not incline. Therefore, the cam followers 33, 34
Maintains the posture along the guide pins 31 and 32, prevents uneven wear and early wear due to inclination, and prevents vibration and noise due to those wear.

Further, in this embodiment, the cam followers 33, 3 are
Since 4 is supported by the guide pins 31, 32, a sufficient spring mounting space can be secured between the cam followers 33, 34 and the piston 5. As a result, a normal coil spring can be used as the urging means, which facilitates production. Moreover, since the spring mounting space can be sufficiently secured, the bending amount of the coil springs 35 and 36 can be sufficiently secured, and the spring load can be reliably exerted on the cam followers 33 and 34. Therefore, it is not necessary to use a coil spring having a large wire diameter and a large spring force, the cam followers 33 and 34 can be easily assembled, and the overall weight can be reduced.

Further, in this embodiment, the cam follower 3
The cam followers 3 and 34 have a conical shape.
3, 34 rotate accurately following the rotation of the wave plate 4, and the guide pins 31, 32 and the cam followers 33,
Unbalanced load does not occur between the unit 34 and. That is, in the rotation of the wave plate 4, the rotation speed is different between the outer peripheral side and the center side. Therefore, when the cam followers 33 and 34 have a cylindrical shape, sliding occurs between the wave plate 4 and the cam followers 33 and 34 toward the outer peripheral side of the wave plate 4, and due to the difference in the sliding amount, Unbalanced load is generated. Unbalanced loads bring about adverse effects such as uneven wear, which can be prevented in this embodiment.

The present invention is not limited to the above-described embodiments, but can be carried out as follows by appropriately changing the configuration without departing from the spirit of the invention. (1) As shown in FIG. 4, the guide pins 31 and 32 and the cam followers 33 and 34 are coupled by the keys 41 and 42 so that the cam followers 33 and 34 cannot rotate with respect to the guide pins 31 and 32. It should be configured to slide with respect to 4.

(2) As shown in FIG. 5, the cam followers 33, 34 are formed in a spherical shape and are rotatably supported by the guide pins 31, 32. (3) In the embodiment of FIG. 5, the cam followers 33, 34 are made non-rotatable with respect to the guide pins by means of a key or the like.

[0023]

As described above in detail, according to the present invention, it is possible to easily manufacture and assemble it, to reduce the weight, and to prevent vibration and noise due to uneven wear.

[Brief description of drawings]

FIG. 1 is a side sectional view of an entire compressor in an embodiment embodying the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a partial side sectional view of a piston, a roller and the like showing a main part of the present invention.

FIG. 4 is a partial side sectional view of a piston, a roller and the like showing a main part of another example.

5 is a partial side sectional view of a piston, a roller and the like in another example from FIG.

FIG. 6 is a partial side sectional view of a conventional wave plate compressor.

[Explanation of symbols]

4 ... Wave plate, 5 ... Double-headed piston, 31, 32
… Guide pins, 33, 34… Cam followers, 35, 36
... Coil springs as urging means, S1, S2 ... Wave plate cam surface

Claims (5)

[Claims] 1. A wave plate compressor in which a cam follower of a piston is engaged with a three-dimensional cam-like wave plate supported on a rotary shaft, and the piston reciprocates through the cam follower by the rotation of the wave plate. A guide pin that is inclined with respect to the axis of the wave plate is supported on the piston, and the cam follower is supported on the guide pin so as to be movable in the axial direction of the guide pin, and a cam follower is provided between the cam follower and the piston. Wave plate type compressor provided with a biasing means for biasing the to the wave plate side. 2. The wave plate compressor according to claim 1, wherein the cam follower has a conical shape. 3. The wave plate compressor according to claim 1, wherein the cam follower has a spherical shape. 4. The wave plate type compressor according to claim 1, wherein said cam follower is rotatably supported with respect to a guide pin. 5. The wave plate type compressor according to claim 1, wherein the cam follower is supported so as not to rotate with respect to a guide pin.