JPS6239273B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a swash plate type compressor, more specifically, a swash plate type compressor with an improved engagement structure between a swash plate fixed to a drive shaft and a piston slidably fitted into a bore of a cylinder block. Regarding compressors.

In a conventional swash plate type compressor, for example, as shown in Fig. 1, a cylinder block A has a cylinder liner B.
are press-fitted and fixed to form a bore C, and a piston D is slidably inserted and held within this bore C. Further, a drive shaft E along the axial direction of the bore C, that is, the sliding direction of the piston D, is supported by the cylinder block A, and the swash plate F is fixed to the cylinder block A. A swash disk G is held in contact with both sides of the outer peripheral edge of the swash plate F so as to be slidable in the circumferential direction, and a ball H is held between the swash disk G and the piston D.
The piston D and the drive shaft E are inserted through the swash plate F.
It was linked to.

However, when the piston D and the swash plate F are to be engaged with each other via the swash disc G and the ball H as described above, it is necessary to increase the assembly precision of the ball H and the piston D, and the piston D and the ball H must be assembled with high precision. The assembly work is troublesome because it is necessary to assemble the swash disk G and then insert the swash plate F between the swash disks G. In addition, a swash disk G and a ball H are installed between the swash plate F and the piston D.
Because of this, the machining errors of these parts will accumulate and result in assembly errors between the swash plate F and the piston D. Therefore, it is necessary to prepare multiple swash disks with different thicknesses in advance and select the swash disk G with the optimum thickness. It was necessary to select and adjust assembly errors.

The present invention has been made in view of the above, and includes:
It is an object of the present invention to significantly reduce the number of parts interposed between a swash plate and a piston, thereby reducing manufacturing costs and improving workability in assembling the two.

The present invention will be described below with reference to an embodiment shown in FIGS. 2 to 9.

In the figure, reference numeral 1 denotes a cylindrical cylinder block, in which a cylinder liner 2 is press-fitted and fixed, and a plurality of bores 3 are formed along the axial direction of the cylinder block 1.
is formed. A piston 4 is slidably inserted and held in the bore 3, and has a spherical receiving surface 5 opening toward the central axis of the cylinder block 1 at its center.

Reference numeral 6 denotes a drive shaft rotatably supported on the central axis of the cylinder block 1, and fixes the swash plate 7 as in the conventional case. By forming a fitting groove 9 in the ball 8 that is rotatably fitted and held in the receiving surface 5, the outer peripheral edge of the swash plate 7 is inserted into the fitting groove 9 in the rotational direction (circumferential direction). The swash plate 7 and the piston 4 are slidably fitted into each other to engage the swash plate 7 and the piston 4. 10 is an oil hole.

In the above configuration, when the drive shaft 6 is rotationally driven, the swash plate 7 rotates accordingly. Then, since the outer peripheral edge of the swash plate 7 is fitted into the fitting groove 9 of the ball 8 which is fitted and held in the receiving surface 5 of the piston 4 so as to be slidable in the rotational direction, the rotation of the swash plate 7 is prevented. At the same time, the piston 4 is reciprocated within the bore 3 via the ball 8.

In other words, when the drive shaft 6 is rotationally driven, the swash plate 7
The piston 4 reciprocates within the bore 3 via the ball 8 and performs the required suction, compression, and discharge operations as in the conventional case.

Here, in the present invention, since the piston 4 and the swash plate 7 are engaged with each other via only the balls 8, the number of parts for connecting the two can be significantly reduced compared to the conventional art. Therefore, it is possible to improve the assembly workability of both parts and the workability of the parts, and also to reduce assembly errors.

Further, since it is not necessary to provide two balls as in the conventional case, the workability of the piston can be improved.

In the embodiment, the ear portion 11 forming the opening edge of the receiving surface 5 formed on the piston 4 is caulked to fit and hold the ball 8 on the piston 4. As shown in FIG. 5, the ball 8 may be fitted onto the receiving surface 5 while being held upright, and the swash plate 7 may prevent the ball 8 from falling off.

It goes without saying that the stroke of the piston 4 can be changed simply by changing the depth of the receiving surface 5, that is, the holding position of the ball 8 with respect to the piston 4.

On the other hand, the bottom surface of the fitting groove 9 of the ball 8 is generally formed in an arc shape along the outer peripheral surface of the swash plate 7, as shown in FIG. 8, for example, but as shown in FIG. , the bottom surface of the fitting groove 9 may be formed flat.

As explained above, according to the present invention, the ball, which is slidably fitted and held in the piston, and the swash plate are fitted so as to be slidable in the rotational direction of the swash plate. There is no need to use a storage disk. Therefore, the engagement structure between the piston and the swash plate can be simplified, and at the same time, the number of parts interposed between the two can be significantly reduced, improving assembly workability and assembly accuracy, and ultimately improving the swash plate type compressor. can reduce manufacturing costs.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing an example of a conventional swash plate compressor, FIG. 2 is a schematic sectional view showing an embodiment of the swash plate compressor according to the present invention, and FIG. 3 is a bottom view of the same piston. Figure 4 is a cross-sectional view of Figure 3, Figure 5 is
The figure is a sectional view of Fig. 4, Fig. 6 is a bottom view of the ball, Fig. 7 is a front view of Fig. 6, Fig. 8 is a sectional view of Fig. 7, and Fig. 9 is a modified example of the ball. FIG. 1...Cylinder block, 3...Bore, 4...
Piston, 5... Reception surface, 6... Drive shaft, 7... Swash plate, 8... Ball, 9... Fitting groove.

Claims (1)

[Claims] 1 A piston is slidably inserted into a bore formed in a cylinder block, a drive shaft extending in the sliding direction of the piston is pivotally supported by the cylinder block, and a swash plate fixed to the drive shaft is engaged with the piston. The compressor is a swash plate type compressor in which a piston is caused to reciprocate within a bore via a swash plate as the drive shaft rotates, the piston having a spherical bearing surface formed therein; 1. A swash plate type compressor, characterized in that a ball is rotatably fitted and held in the swash plate, and an outer peripheral edge of a swash plate is fitted into the ball so as to be slidable in the rotational direction.