JPH0221068A - piston device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of Shokuto] The present invention relates to a piston device, especially KrII! The present invention relates to a piston device that has compactness and good assemblability.

[Conventional technology]

A conventional piston device will be explained with reference to Fig. 6, Fig. 4, and Fig. 5.

A sphere 2 is fixed to the tip of the arad 1, and as a method of rotatably locking the sphere 2 to the piston 30 and the spherical seat 4, a caulking method as shown in FIG.
In some cases, a sliding member is interposed between the spherical body 20 and the spherical body 20, but due to variations in dimensions during the crimping process, wear marks of the crimped portion or the intervening sliding member, etc., the spherical body 3 and the spherical seat 4
An abnormal gap was generated between the two, causing mt. To address this problem, methods of locking the spring force have recently been proposed. In Figure 4, a pressure spring 5' is formed by bending a plate spring, and a circular arc at the center of the soil layer spring 5' is used to form a sphere 2 into a spherical surface. 44 and the circular surface of the piston 5 at both ends 52'. In addition, in the fifth cause, by press-fitting the soil layer spring 5', which has a substantially cylindrical shape with a spherical pressure vessel part at the tip and has a slit on the outer periphery, into the inner diameter of the piston 5, the spherical body 2 is locked to the spherical surface ff14. ing. These piston devices ltK
Related publications include JP-A No. 61-268878, JP-A No. 62-204985, and JP-A No. 62-265478.

There is a point contact, and furthermore, the piston 5 and the soil layer spring 5
Since the locking portion 6 with the spherical body 2 is only in the 2' direction, there is a problem that the connection between the spherical body 2 and the spherical seat 4 is unstable. Furthermore, in the conventional technique shown in Fig. 5, since the soil layer spring 5' is press-fitted, it is not possible to obtain good assemblability, the outer diameter of the piston is deformed, and a sufficient sealing length, that is, skirt length of the piston 3 is ensured. There were problems such as not being able to do so.

An object of the present invention is to solve the above-mentioned problems and provide a piston device that has high reliability and good erecting properties.

[Means to solve the problem]

The above object is a piston device in which a spherical body is provided at the tip of a Zen-shaped head, and the spherical body is rotatably locked using the pressure force of a spherical iK spring of the piston.

The soil layer spring has a substantially annular high 1!111 height part with a semicircular cross section at the retractable part with the penile body, which is continuous with the rigidity of the island and overflows in the axial direction of the piston. This is achieved by having a rising portion having an elasticity of more than 5 degrees, and locking the rising portion with a protrusion 11SK on the inner diameter of the piston corresponding to each portion tflK.

[Effect]

Since the distal end of the retaining spring is a highly rigid portion having a substantially spherical shape with a semicircular cross section, the sphere and the retaining spring are in working contact. In addition, since the elastic rising part has two or more inclined surfaces, the spring force in the direction of layering the sphere and the spring force in the direction of making the rising part look at the inner surface of the piston are dominant at the same time. and has five or more rising portions, the spring force always acts in the direction of holding the sphere at the center of the piston, and the sphere can be stably locked on the sphere seating surface. Good assemblability can be obtained due to the elasticity of the rising portion. In addition, the pressure force of the sphere is set to be greater than the inertia force of the piston during maximum rotation operation, which prevents abnormal gaps from forming between the sphere and the spherical seat during operation (and ensures stable retention and quiet operation). is obtained.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

The extended portion of the locking spring 5 is a highly rigid portion 51 having a substantially annular shape with a semicircular cross section, and comes into contact with the sphere 2.

A rising portion 52 that is continuous with the same high rigidity portion 51 and is located in the axial direction.
has two continuous sloped surfaces, and generates spring force in the direction in which the spheres 2 are layered alternately and in the direction in which they are densely layered on the inner surface of the piston S. Further, the front self-rising part has three positions and has a rising part of at least another 1' position outside the range of 180° centered on the rising part of any one position,
The spring force that holds the sphere 2 acts to keep the sphere 2 at the center of the piston 5 at all times. Further, the inner diameter of the piston 5 has a protrusion 6 corresponding to the position of each rising portion 52,
The protrusion 6 faces the entrance part of the piston 3, and
an inclined surface that is continuous with the inner wall and gradually increases in height toward the spherical seat 49Ill;
It also has a flat part forming an angle of approximately 90° or less with the inner wall of the piston 5, and is continuous with each rising part 52 of the 1JTJ grip locking spring 5 from the high-rigidity tip part 51, and has a width larger than the projection 6. 3 Groove portion 55 extending in the central axis direction
A connecting part 54 is provided in the middle of the 'p1 part 55 to be engaged with the surface of the spherical seat 49411 of the protrusion 60, and both ends of the connecting part 54 are further connected to the piston 6 than the retaining position of the protrusion 6.
By extending toward the opening side, the locking spring 5 can be easily assembled and securely locked.

Furthermore, by changing the width of the 55 or the width of the connection s54, the spring constant of the rising portion 52 can be adjusted. The shape of the locking spring 5 can be changed even if a groove 55 through which the rod 1 can pass is provided in the high-rigidity part 51 as shown in Figure 2.
In this case, iA, ME of the angular pitch of each rising edge s52
Alternatively, a uniform spring force can be obtained by changing the distribution inclination angle of the length of the inclined surface. In addition, in this embodiment, since the head 31 having the spherical seating surface of the piston 50 and the skirt portion 52 having the outer diameter sliding surface are separate bodies, the head 3 is made of a highly wear-resistant carbon material or an oil-impregnated material. Since it can be formed from a sintered material or the like, it is possible to improve the reliability of the ball seat $4, and the skirt portion 32 is provided with a sufficient seal length, making it possible to improve performance.

〔Effect of the invention〕

According to the present invention, the gI reliability of the piston device is improved and the ease of assembly is improved.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a piston device showing an embodiment of the present invention, Fig. 2 is a perspective view of the retaining spring, and Figs. 3, 4, and 5 show a conventional piston device. FIG. 1... Rod 2... Sphere 6... Piston 4... Ball seat 5... Locking spring
5', 5'... Okanebane Misakibushi? + 3 Illustration 2 Figure 4 Figure low/+lr: 2 key answer 3 Heath F-n

Claims (1)

[Claims] 1. A piston device in which a spherical body is provided at the tip of a bar-shaped rod, and the spherical body is rotatably locked to a spherical seat of a piston using the pressure force of a spring, in which the pressure spring has a contact portion with the spherical body. It is a substantially annular high-rigidity part with a semicircular cross section, and has three or more elastic rising parts along the piston axial direction that are continuous with the high-rigidity part, and the tips of the rising parts are connected to each other. A piston device characterized in that the piston is locked at a protrusion on the inner diameter of the piston corresponding to a position.