JPH0738703Y2 - Swash plate support mechanism in rocking swash plate compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a swash plate support mechanism in an oscillating swash plate compressor.

[Prior Art] A compressor of this type is disclosed in Japanese Utility Model Laid-Open No. 62-88887, in which an inclined action surface of a wedge-shaped rotor (rotational driving body) fixedly supported on a rotary shaft and a rocking plate (vibration plate) By virtue of the presence of the thrust bearing between the swash plate and the swash plate, the oscillating plate can oscillate without rotating. The oscillating plate is connected to the protruding end of the support shaft fitted and supported in the cylinder block in a meshing relationship with the bevel gear, and a ball serving as the oscillating center is interposed between the oscillating plate and the support shaft. There is. Therefore, with the rotation of the wedge-shaped rotor, the swing plate swings without rotating while meshing with the support shaft via the bevel gear portion. The oscillating plate is pressed and urged toward the wedge-shaped rotor by the action of a pressing spring interposed between the fitting end of the support shaft and the cylinder block. An annular race surrounding a rotary shaft is interposed between the thrust bearing and the wedge-shaped rotor, which receives the pressing action and the compression reaction via the piston, and between the thrust bearing and the oscillating plate. The thrust bearing, which is fitted and held in the upper position regulation hole and is regulated in the radial direction, is rollingly guided on both annular races.

[Problems to be Solved by the Invention] However, due to the rotational oscillating action on the thrust bearing, the thrust bearing vibrates violently at high speed operation, and the vibrating load of this thrust bearing and the tubular guide portion on the inner circumference of one of the annular races cause sliding. The sliding load on the inner peripheral surface of the position-regulating ring that is dynamically guided spreads to the position-regulating ring. The position regulation ring may be damaged by this load ripple, and the reliability of the swash plate support mechanism in high-speed operation where this load ripple increases becomes low.

The vibration of the thrust bearing becomes more pronounced as the diameter increases, so it is possible to use a thrust bearing with a small diameter that meets the demand for compaction of the compressor as a whole, but the small load bearing capacity is compensated for by the small diameter. Therefore, an increase in the number of thrust bearings cannot be avoided. An increase in the number of small-diameter thrust bearings leads to an increase in the number of position regulating holes, and the increase in the number of position regulating holes reduces the strength of the position regulating ring, so that it is impossible to reliably avoid the occurrence of damage to the position regulating ring.

An object of the present invention is to improve the reliability of the swash plate support mechanism by eliminating the above-mentioned drawbacks when the thrust bearing is used.

[Means for Solving the Problem] Therefore, in the present invention, a shoe having flat portions on both sides is irremovably interposed in a recess formed between the rotary drive and the swash plate.

[Operation] The shoe, which makes surface contact with both the rotary drive and the swash plate, has much higher load-receiving capacity than the line bearing thrust bearing, and also has a member corresponding to the position regulating ring attached to the thrust bearing. It becomes unnecessary. Therefore, the members are not damaged and the mechanism is simplified.

[Embodiment] An embodiment embodying the present invention will be described below with reference to FIGS.

A front end plate 2 and a rear housing 3 are joined and fixed to the front and rear of a cylinder block 1 which is a part of the housing of the entire compressor, and a rotary shaft 4 is rotatably supported on the front end plate 2. , The rotary shaft 4 protruding into the crank chamber 1a of the cylinder block 1
A wedge-shaped rotation driving body 5 is fixed to the inner end of the.

A support shaft 6 is slidably fitted and supported on the cylinder block 1 on the rotation axis of the rotation shaft 4, and a pressing spring 7 is interposed between the fitting end of the support shaft 6 and the cylinder block 1. . A bevel gear portion 6a is formed at an end portion of the support shaft 6 protruding into the crank chamber 1a, and a ball 8 and a swinging inclination are provided between the protruding end portion of the support shaft 6 and the inner end portion of the rotary shaft 4. A plate 9 is interposed. A bevel gear portion 9a is formed at the center of the swing swash plate 9, and the bevel gear portion 9a can slide on the ball 8 while meshing with the bevel gear portion 6a.

The swing swash plate 9 is provided in a plurality of cylinder bores 1b (five in this embodiment) penetrating the cylinder block 1 so as to connect the crank chamber 1a, the suction chamber 3a and the discharge chamber 3b in the rear housing 3 to each other. Is connected to the piston 11 via a piston rod 11a. A plurality of supporting recesses 9b are provided on the outer peripheral side of the facing surface of the swing swash plate 9 that faces the tilt acting surface 5a of the rotary drive body 5.
(Five in this embodiment) are provided as recesses, and each support recess 9b is provided.
A disc-shaped shoe 10 having low friction is press-fitted into the. Each support recess 9b is set on the back side of the connecting portion between the piston rod 11a and the swing swash plate 9, and the refrigerant gas compression load in each cylinder bore 1b is directly received by each shoe 10.

One flat surface portion of each disk-shaped shoe 10 is in contact with the inclined action surface 5a of the rotary drive body 5 by the refrigerant gas pressure and the pressing spring 7 through the piston 11, and as the rotary drive body 5 rotates. The inclined working surface 5a is in sliding contact with the flat surface portion of each shoe 10 having a small sliding resistance. Therefore, the rotary motion of the rotary shaft 4 is converted into the forward and backward reciprocating swing of the swing swash plate 9 via the rotary drive body 5, and the piston 11 moves back and forth in the cylinder bore 1b. As a result, the refrigerant gas sucked from the suction chamber 3a into the cylinder bore 1b is discharged to the discharge chamber 3b while being compressed.

The shoe 10 used in place of the thrust bearing makes surface contact with both the rotary drive body 5 and the swing swash plate 9,
The load-bearing capacity is much higher than that of thrust bearings that make line contact. Shoe 10 with high load receiving capacity
Is fitted and fixed in the support recess 9b on the swing swash plate 9 side,
It does not come off from the support recess 9b. Therefore, even when the swing swash plate 9 is swung at high speed, the tilting action surface 5a of the rotary drive body 5 is
The sliding contact between the shoe and the shoe 10 is always stable, and the reliability of the swash plate support mechanism during high-speed operation is high. Moreover, the number of parts is reduced as compared with the case where the thrust bearing is used, and the mechanism is simplified, which is advantageous in terms of assemblability and cost.

Further, since each shoe 10 is set on the back side of the connecting portion between the swing swash plate 9 and the piston rod 11a, the reaction of the refrigerant gas compression does not act as an unbalanced load on the shoe 10, and the sliding contact action is performed. The most unfavorable contact between the shoe 10 and the inclined working surface 5a is reliably avoided. Moreover, the thickness of the shoe 10 can be set smaller than the diameter of the thrust bearing, and the thinning of the shoe 10 narrows the facing distance between the rotary drive body 5 and the swing swash plate 9 to increase the thickness of the swing swash plate 9. Can be planned. The increase in the thickness of the swing swash plate 9 leads to an increase in the strength of the swing swash plate 9 itself, and the durability during high-speed operation is improved.

The present invention is of course not limited to the above-mentioned embodiment, and the embodiments shown in FIGS. 3 to 5 are also possible.

In the embodiment shown in FIG. 3, a supporting ring 12 is fixed to the swing swash plate 9 and a supporting hole 12a is provided through the supporting ring 12, and a shoe 10 is press-fitted into the supporting hole 12a. .

In the embodiment shown in FIG. 4, a support recess 5b is provided on the rotary drive body 5 side, and a shoe 10 is press-fitted into this support recess 5b.

In the embodiment shown in FIG. 5, a shoe 10 is fixed to the swash plate 9 side, and an annular race 13 is fixed to the rotary drive body 5 side, so that the annular race 13 and the shoe 10 are in sliding contact with each other. . In this embodiment, it is possible to select a lightweight material for the rotary driving body 5 while selecting an appropriate material combination of the annular race and the shoe 10.

The present invention can also be applied to a variable displacement rocking swash plate compressor as shown in FIG. The rotary driver 14 is a rotary shaft.
The sleeve 16 slidably supported on the shaft 15 is supported by a pair of left and right shaft pins 16a (only one is shown), and the pin 18 is attached to the long hole 17a of the rotary support 17 fixed to the rotary shaft 15. Is connected via a rotary drive 14 and a swing swash plate.
A shoe 20 is interposed between the shoe 20 and the shoe 19. Rotary drive 14
The angle of inclination is influenced by the difference between the pressure in the crank chamber C and the suction pressure in the compression chamber via the piston 21, and the pressure in the crank chamber C is controlled by opening / closing the electromagnetic control valve mechanism 22. In this embodiment as well, the reliability of the swash plate support mechanism is improved by the presence of the shoe 20, as in the above-described embodiments.

[Advantages of the Invention] As described in detail above, according to the present invention, the shoe having the flat portions on both sides is irremovably interposed in the recess formed between the rotary driving body and the swing swash plate. The load receiving ability at the time is remarkably improved, and the excellent effect that the reliability of the swash plate support mechanism in high-speed operation can be improved is exhibited.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment embodying the present invention,
FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIGS. 3 to 5 are sectional views of a main portion side showing another example of the present invention, and FIG. 6 is embodied in a variable displacement compressor. It is a sectional side view showing an example. Rotating shafts 4,15, rotation driving bodies 5,14, inclined working surface 5a, supporting recesses
5b, swing swash plates 9, 19, support recess 9b, support hole 12a, shoe 10,
20.

Claims (1)

[Scope of utility model registration request] 1. A crank chamber, a suction chamber, a discharge chamber, and a cylinder bore connecting these chambers are defined and formed, and a rotary drive member is provided on a rotary shaft in a housing for accommodating a piston in the cylinder bore for reciprocating linear movement. The rotary motion of the rotary drive body is supported by a swing swash plate that is supported and supported so as to face the tilt acting surface of the rotary drive body, and a piston rod that is interposed between the swing swash plate and the piston. In a swing swash plate type compressor that converts the piston into reciprocating linear motion, a swing swash plate type in which a shoe having flat portions on both sides is irremovably interposed in a recess formed between a rotary drive and a swing swash plate Swash plate support mechanism in compressor.