JPS6117732A - Anti-vibration leg - Google Patents

Abstract

PURPOSE:To simplify the structure and provide possibility of setting the anti- vibration characteristics to the optimum point by utilizing the rubber elasticity of an O ring. CONSTITUTION:An outer cylinder 1 with one end open and the other closed is equipped in its center in the axial length with an internal circumferential groove 1a, while an inner cylinder 2 with one end open and the other closed alike is furnished in the center of its length with an external ring groove 2a, and these grooves 1a, 2a form a ring-shaped space together. In this ring-shaped space an O ring 4 is fitted, to which a preload is applied previously. This O ring is deformed when the inner 2 and outer 1 cylinders make a relative displacement, and vibration will be absorbed by its resilience.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration-resistant leg for supporting equipment that generates vibrations during operation.

For example, since a reciprocating motor such as a diesel engine generates vibrations during operation, it is desirable to support this equipment with anti-vibration legs so that the vibrations are not transmitted to a fixed part such as a floor that supports this equipment. The present invention relates to a vibration-resistant leg that has the ability to absorb vibrations as described above.

[Prior art]

Anti-vibration legs have been used in the past, but as shown in Figure 1, conventional anti-vibration legs are made by baking disks D on both ends of a circular tomb or cylindrical body C made of an elastic material such as rubber. Generally, it has a fixed structure.For example, this vibration-proof leg is attached to a supporting part and a supported body (both not shown) using a screw 8 fixedly set up in the center of the disk D, and the cylindrical body C is fixed. It was designed to withstand vibrations due to its elasticity.

Since conventional vibration-proof legs had such a structure, their vibration-proof characteristics are uniquely determined by the shape and dimensions of the cylindrical body C, so there are drawbacks that make it difficult to fully satisfy various demands. there were.

[Summary of the invention]

This invention was made in consideration of the above-mentioned actual situation of the conventional products, and an object of the present invention is to provide a vibration-resistant leg that can suitably select vibration-resistant characteristics and has a simple structure and durability. , an outer cylindrical body having an inner annular shape #l'ft and an inner cylindrical body having an outer annular groove are concentrically assembled in the axial direction so that the annular shapes m coincide with each other, and an elastic O-ring is preloaded in the annular groove. By connecting the inner and outer cylindrical bodies at 0s/g to form a vibration-proof arm, the elastic 0-ring absorbs vibrations by utilizing the spring action caused by cross-sectional deformation. The spring characteristics can be selected linearly and softly.

[Embodiments of the invention]

The present invention will be specifically described below with reference to the illustrated embodiments.

As shown in Figure 1, the anti-vibration arm made by FJAK consists of an outer cylindrical body l, which is a cylindrical body with one end open and the other end closed, and a diameter smaller than the outer cylindrical body, which is similarly open at one end and the other end is closed. It consists of an inner cylindrical body, which is a closed cylinder, and an elastic O-ring holder attached to an annular gap 3 that is created between the inner and outer cylinders when the inner cylindrical body is placed concentrically inside the outer cylinder. ing. The outer cylindrical body lf''i has an inner annular shape approximately in the center of its axial length.
Similarly, the inner cylindrical body is provided with an outer circumferential annular groove 2avf in the center of its length, and these annular grooves/a and core a are approximately elliptical in shape and are opposed to each other at positions coincident with each other in the axial direction. An annular space with a cross-sectional shape is formed, and this annular space has an elasticity of 0
When the ring l is fitted, the outer surface of the O-ring da is in contact with the inner circumferential annular groove /a and the inner surface is in contact with the outer circumferential annular groove 2a. When F'L is greatly expanded, it is lowered to the inner cylindrical body, and the inner and outer cylindrical bodies /9.2 are held concentrically as shown in the figure, with the cylindrical walls maintaining a spacing.

The outer cylindrical body and the inner cylindrical body have mounting screws 5 and 6 erected on the end plates 2b and 2b at their closed ends, and these screws are used to attach the machine frame of the equipment and the equipment. The vibration-proof arm is attached to a fixed part that supports the base frame, etc., and the equipment is supported from the base frame.

Therefore, when the equipment experiences vibration due to operation, etc.,
The inner cylindrical body is displaced relative to the outer cylindrical body, and the elasticity is 0.
As the ring is fitted, the cross-sectional shape of the annular space created by the inner circumferential annular groove /a and the outer circumferential annular groove core a changes, and this attempts to change the cross-sectional shape of the elastic O-ring, so the elasticity is 0.
The ring acts as a spring and acts to absorb vibrations.

Since the elastic O-ring is used with a preload applied, the load characteristics of the rubber of this elastic O-ring are shown in Figure 7 (Ks is the coefficient for the lateral load and Kc is the coefficient for the longitudinal load, as shown in Figure 1). ), then the coefficient changes linearly s %
The spring stroke can be used between a' and mar, and a linear and soft spring characteristic can be obtained.

〔Effect of the invention〕

As described above, the present invention has elasticity of 0.7g VC.
Since it utilizes the elasticity of rubber, the structure is simple, and by appropriately selecting the O-ring, a spring with desired characteristics can be easily obtained.

[Brief explanation of the drawing]

Fig. 7 is a side view showing a conventional anti-vibration arm, Fig. 1 is a vertical section showing an embodiment of the anti-vibration arm according to the present invention, Fig. 3 is a plan view of the anti-vibration arm in Fig. 2, and Fig. 9 is a spring characteristic. Group 2 showing an example of
It is 7. l...outer cylindrical body, /a...inner circumference annular groove, /1)...end plate, K...inner cylindrical body, Ja...outer circumference annular groove, 2b...end plate, 3...gap, da ...Elasticity. Ring, 5, 6...screw, C...cylindrical body, D...disk,
S...Screw. Patent applicant: Takara Industries Co., Ltd. Figure 2 Figure 3 Figure 4 mm

Claims (1)

[Claims] an outer cylindrical body having an annular groove on the inner periphery; an inner cylindrical body having an annular groove on the outer periphery and located concentrically within the outer cylindrical body with a distance maintained in the radial direction; A vibration-proof leg comprising an elastic O-ring fitted with a preload into the annular groove.