JPS5884264A - Piston device - Google Patents

Abstract

PURPOSE:To prevent noise due to backlash on the annular spring material in such a way that a return part is formed at the outer peripheral end of an annular spring material which engages with a spherical body at the end part of a connecting rod inserted into the concave part of the semispherical face of a piston, and it is forced into the inner wall of the piston skirt part. CONSTITUTION:After a spherical body 4 at the end part of a connecting rod 6 is inserted into the concave part 3 of the semispherical face of a piston 2, an annular spring material 8 to engage with it is formed by a holding part 81 to support the spherical body 4, void parts 82 which are provided in the proper number of pieces near the holding part 81, and a return part 83 which is installed at the outer peripheral end by means of bending machining, or the like. And, since the annular spring material 8 is made with improvement of resilient force and edge strength by quenching and/or tempering on the carbon steel, such as SK-5, or another, the return part 83 at the outer periphery of the annular spring material 8 provides biting effect into the inner wall just by forcing into the inner wall of the skirt part 21 of the piston 2, and it prevent separation of the annular spring material 8.

Description

[Detailed Description of the Invention] The present invention includes a connecting rod, a piston, a t-spherical surface and a g! This invention relates to an improvement of a piston device joined with &.

To explain the conventional piston device, as shown in FIG.
, n'ra piston (21, inner wall C of the piston): a hemispherical recess (A) formed therein, a spherical body (4) supported by the hemispherical recess at one end, and a large end that fits into the crank. (5) A piston device consisting of a connecting rod (6) provided at the other end.ae This is an annular groove formed on the inner wall of the skirt portion ad of the piston (21')
: is a piston (two hemispherical recesses (connecting rod (6) on 3f)
It is constructed by inserting an annular spring member (7) having a trapezoidal cross section to join a spherical body (4) provided at one end of the spring member. However, according to the above configuration ζ, drilling the annular groove ■ on the inner wall of the skirt portion +21 of the piston (2) not only significantly reduces work efficiency, but also makes it difficult to fit into the annular groove 0 yen. Since the fitting dimensions of the annular spring material (7) are not accurate,
There is a drawback that noise is generated due to the play within the annular groove.

The present invention was made in view of these drawbacks, and is shown in Figure C below.
The following examples will be explained based on the following examples.

(1) Two pistons (2), a hemispherical recess (31, and a spherical body 4 supported by the hemispherical recess) formed on the inner wall of the piston at one end, and a large end (5) that fits into the crank.
) and a connecting rod (6) provided at the other end.

(8) 4 spherical bodies (4) V piston (2) hemispherical recess 13) Also, as shown in Figure 183C, there is a holding part @force that supports the spherical body (4), an appropriate number of voids (■) provided near the holding part, and an outer peripheral edge. In the piston device configured as described above, the piston device has a shape including a bent portion formed by bending or the like.

The annular spring material (8) is made of carbon tool steel such as VSK-5, which has been heat-treated to improve its elastic force and edge strength. The provided return part 0111, the annular spring material is connected to the piston (2)
Skirt part c! 1. It has the effect of biting into the inner wall simply by press-fitting it, and the piston (2) and the spherical body (4) of the connecting rod (6) are connected by the simple operation of press-fitting without the annular spring material coming off. Get used to it. In addition, the elastic effect is improved by the annular spring material (8)C having an appropriate number of gaps divided into two parts.

As described above, the present invention provides the hemispherical concave portion C of the piston.

One end C of the connecting rod: In a piston device configured to insert an attached spherical body and lock the spherical body with an annular spring member, the annular spring member forms a curved portion on its outer periphery. C2 Since it is press-fitted into the inner wall of the skirt portion of the piston, the annular spring material can be locked to the piston by the simple operation of press-fitting, which greatly improves the work of connecting the piston and the spherical body of the connecting rod. It is possible.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional piston device, Fig. 2 #
Third sectional view of a piston device showing an embodiment of the present invention
(4 (CI is a plan view of the annular spring material of the present invention and A-A
It is a sectional view in a sexy state.

Claims (1)

[Claims] (1) Hemispherical recess C2 of the piston, one end C of the connecting rod
In a piston and y device configured to insert two attached spherical bodies and lock the spherical bodies with an annular spring material. The annular spring material has a curved portion formed on its outer periphery and (
A piston device characterized in that it is press-fitted into the inner wall of the skirt portion of a 1liJ-written body.