JPS63253184A - Compressor - Google Patents

Abstract

PURPOSE:To improve assembly workability, by assembling a spherical ball and shoe of sliding part, which serve as a turn lock mechanism for a piston support corresponding to a journal, to be integrally formed. CONSTITUTION:A journal 10 rotates by a shaft 6 generating a swivel motion corresponding to a tilt angle, and a piston 20 fits a piston support 8 performing a reciprocating motion of the piston. A turn lock mechanism of the piston support 8 comprises a ball 14, fitted to a slide pin 12, and a shoe 16 integrally formed with that ball 14. Accordingly, if the ball is inserted to the pin, it is only required next for assembly to insert a shoe part into a cylindrical groove, thus assembly workability can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a variable displacement single swash plate compressor, and more particularly to a shoe suitable for assembling a rotation prevention part of a piston support of a compressor.

[Conventional technology]

In a conventional device, as described in U.S. P. 4,297,085, the shoe in a variable displacement expansion-compressor is constructed of two parts, a cylindrical part on the outside of the shoe, and a ball that slides on a pin. The structure was such that it moved back and forth in a groove shaped like that of the original. The important point here is that the shoe of the prior art is
It has a structure in which it is sandwiched between two parts so as to include the inner ball, and allows reciprocating sliding motion.

[Problem that the invention seeks to solve]

The above conventional technology does not give consideration to product assemblability, and the assembly time cannot be shortened. Furthermore, each shoe can freely move circumferentially within the circumferential groove, and the gap between the outer diameter of the shoe and the groove diameter is c.
Since one shoe flaps in the AP, there are problems such as abnormal noise and shortened shoe life.

An object of the present invention is to integrate the shoe into one piece by using a filter structure with a ball inside the shoe, thereby improving ease of assembly, life of the shoe, and noise reduction.

[Means for solving problems]

In order to achieve the above objective, we focused on the following points and solved the problems.

First, it is necessary to have a structure that allows balls to be placed inside the shoe and that does not allow the balls to fly out during operation of the compressor. The points that should be noted at this time are:
The angle of the pin axis with respect to the cylindrical axis formed on the outside of the shoe changes with one rotation of the shaft, so when making an integral shoe, the width B is larger than the pin axis diameter (but smaller than the ball outer diameter). A groove with a relief length L that is equal to or greater than the variation angle and less than the shoe length is required. At the same time, a spherical groove is required to contain the ball inside the shoe. This spherical groove has a diameter slightly larger than the outer diameter of the ball and can be formed from the relief portion by lathe processing using a cutting tool or the like.

In order to fit the ball inside the shoe according to the required shape of the shoe as described above, at least the width b of the ball (a cylindrical hole for passing the pin through the inside of the ball is required, and the width in the longitudinal direction of this cylindrical hole) must be smaller than the groove dimension B, which is larger than the diameter of the pin shaft provided on the shoe and smaller than the outer diameter of the ball.

Further, the length Q of the linear portion in the longitudinal direction of the relief groove of the pin shaft provided in the shoe requires the following conditions, assuming that the ball diameter dn and the ball width are the same.

α≧J77F To summarize these conditions, D≧dn D: Shoe outer diameter dB>B≧b
B: Shoe relief groove width B≧dp
dp: Pin shaft diameter L≧da L: Shoe relief groove length Q≧If the shoe relief groove, ball diameter, and width are selected to satisfy the following conditions, the ball will pass through the shoe relief groove. By rotating the ball in the spherical groove inside the shoe, the ball can be contained inside the shoe and the shoe can be integrally formed.

[Effect]

By integrating the shoe, it is possible to integrate the shoe and the ball by inserting the ball inside the shoe.If the ball is inserted into the pin, then part of the shoe is inserted into the cylindrical groove. That's all you need.

This eliminates the need for the conventional operation of inserting the ball into the cylindrical groove while holding it between shoes, thereby improving assembly efficiency. Furthermore, since the shoe is integrated, even if there is a gap between the outer diameter of the shoe and the cylindrical groove, the shoe itself is held down in one direction of the cylindrical groove, so it cannot slide through the cylindrical groove within the unit. For.

It also solves the problems of conventional flapping noises and shortened lifespan.

〔Example〕

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

The drive plate 4 fixed to the shaft 6 rotates at the same rotational speed as the shaft 6. A journal 10 is connected to the drive plate 4 so that the top clearance formed between the cylinder heads 22 when the piston 20 reaches the top dead center is constant and the inclination angle can be changed. The journal 10 has the same rotation V as the shaft 6.
A piston support 8 that rotates at a speed of &, generates an oscillating motion corresponding to the inclination angle of the journal 10, and causes the piston 20 to reciprocate, is fitted into the journal 10 via a thrust bearing 11 and a radial bearing 13. has been done. A rotation prevention mechanism is interposed in the piston support 8 so that only one period of rocking motion occurs per rotation of the shirt 861, and the piston support 8 does not rotate spatially. In its structure, a slide pin 12 is connected to a piston support 8.

A ball 14 having a cylindrical hole passing through the center of the outer spherical surface is fitted into the slide pin 12.

Further, the integrated shoe 16 is fitted so that the spherical side of the ball 14 and the spherical concave surface inside the shoe 16 can come into contact with each other, and the outside of the shoe 16 slides.

A method of fitting the shoe 16 and the ball 14 is shown in FIG.

The ball 14 is inserted with the width direction of the ball 14 aligned with the width direction of the groove of the shoe 16, and the ball is contained in the shoe by rotating the axis around the center of the concave surface of the ball thrown inside the shoe 16. Finally, the longitudinal end of the outer diameter part of the shoe 16 is tapered to be effective in forming an oil film on the sliding part in consideration of sliding characteristics. The angle of this taper is 5° to 456°.

Further, although the outer shape of the shoe in FIG. 2 is shown to be cylindrical, it is possible and effective to integrate the shoe of the present invention even if it is oval or rectangular, as long as a sliding groove is formed to guide the shoe. It goes without saying that there is.

Although the embodiment shown in FIG. 1 is a variable capacity single swash plate compressor, it goes without saying that a fixed capacity single swash plate compressor is also effective.

・1. 〔Effect of the invention〕 .

According to the present invention, the assemblability of the compressor is improved, and since each shoe is not free, the shoe itself moves along the sliding groove, and there is no flapping phenomenon unlike with a two-part shoe, and no abnormal noise is generated. I was able to reduce the potential.

[Brief explanation of drawings]

Figure 1 is a vertical sectional view including the detent mechanism of the compressor;
The figure is a perspective view showing a method of assembling the shoe and the ball.

Claims (2)

[Claims] 1. includes a shaft pivotally mounted within the cylinder block;
a plurality of cylinder bores formed substantially parallel to the axis of the shaft, a piston being drivingly connected to reciprocate within the cylinder bore;
In response to the rotation of the shaft, the journal has a journal that rotates at a certain angle with respect to the shaft, and a piston support that generates a rocking motion depending on the inclination angle of the journal, and a spherical surface to prevent rotation of the piston support. A compressor having a rotation stopper composed of a ball and a shoe of sliding parts, characterized in that the shoe is integrated. 2. The compressor according to claim 1, wherein the shoe is provided with a relief groove width that is greater than the width of the ball.