JPH05126204A - Vibration-proof rubber bush - Google Patents

Abstract

PURPOSE:To facilitate sealing of liquid and to prevent rapid increase of a spring constant in the axial direction caused by influence of liquid pressure. CONSTITUTION:A cylindrical 'A' fitting 11 with a bottom is provided at an inner cylinder 10, and an elastic member 12 having a 'B' fitting 13 on its outer side is provided at the upper outer circumference of the 'A' fitting 11. In an outer cylinder 8, a cap state 'D' fitting 19 with a bottom is supported at a lower part of a cylindrical 'C' fitting 16 through a rubber part 18, and a bottom wall 17 for elastically supporting the inner cylinder 10 is formed. A silicone oil 'S' is stored in the outer cylinder 8 in advance, and a lower part of the 'A' fitting 11 of the inner cylinder 10 is fitted in the 'D' fitting 19 of the outer cylinder 8. And the 'C' fitting 16 of the outer cylinder 8 is caulked onto a seal rubber 14 on the outer circumference of the 'B' fitting 13 of the inner cylinder 10 and the both are assembled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration rubber bush used for supporting an anti-vibration member such as an automobile suspension.

[0002]

2. Description of the Related Art As shown in FIG. 13, a transverse link 1 which constitutes a part of an automobile suspension has a ball joint 3 for supporting a wheel 2 on the outside, and an inside front portion has a transverse link bush. A compression rod 6 is supported on the vehicle body 5 through the inner side rear portion.

FR indicates the front side.

The compression rod 6 is provided with the compression rod bush 7 on the vehicle body 5.
Supported by.

As shown in FIG. 14, the compression rod bush 7 has a bottomed outer cylinder 8 into which an inner cylinder 10 covered with an elastic member 9 is fitted, so that the elastic member 9 and the outer cylinder 8 are fitted together.
Silicon oil S as a liquid is enclosed between the inner cylinder 10 and the rod end 6a of the compression rod 6.
Is inserted and fixed (this structure is disclosed in Japanese Patent Laid-Open No. 2-1
No. 42945).

[0006]

The loss factor can be increased by enclosing the above-mentioned silicone oil S.
The axial direction of the rod end 6a of the compression rod 6 (P
When a compressive load is applied in the (direction), the bottom of the outer cylinder 8 is a rigid body, so there is no escape for the silicone oil S, and the spring constant in the axial direction rapidly increases due to hydraulic pressure.

On the other hand, if the structure having the outer cylinder 8 having no bottom is used, such a problem does not occur, but it is inevitable that the work for sealing the liquid is difficult in the structure having no bottom. Will be.

Therefore, the present invention provides a vibration-proof rubber bush that is easy to fill with liquid and is not affected by hydraulic pressure.

[0009]

A liquid is accommodated in a bottomed outer cylinder, and an inner cylinder, into which a rod end of a vibrating member is inserted and fixed, is fitted into the outer cylinder via an elastic member. The bottom wall of the cylinder elastically supports the lower part of the inner cylinder.

[0010]

Since the outer cylinder has the outer wall, the liquid can be smoothly filled in, and even if a large input load acts in the axial direction of the rod end of the vibrating member, the bottom wall of the outer cylinder does not lower the lower part of the inner cylinder. Since it is elastically supported, it is possible to prevent the spring constant from increasing rapidly in the axial direction without being affected by hydraulic pressure.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

In the embodiment shown in FIGS. 1 to 4, a compression rod bush 7 as a vibration-proof rubber bush is used.
The inner cylinder 10 into which the rod end 6a of the compression rod 6 as a vibrating member is inserted and fixed is fitted into the bottomed outer cylinder 8.

As shown in FIG. 2, the inner cylinder 10 has a bottomed cylindrical A-shaped metal fitting 11 whose inside is covered with a rubber material. 12
The B metal fitting 13 is attached to the outer side of the, and the outer side of the B metal fitting 13 is curved inward, and the seal rubber 14 is provided on the outer periphery thereof. In addition, 15 shows a ring.

On the other hand, the outer cylinder 8 is formed by coating a rubber material on the outside of a C-shaped metal fitting 16 having a cylindrical shape.
A bottomed cap-shaped D fitting 1 with a rubber part 18 at the bottom of the
9 is supported and is elastically configured.

Silicon oil S as a liquid is stored inside the outer cylinder 8, and the lower portion of the A metal fitting 11 of the inner cylinder 10 is press-fitted into the D metal fitting 19 of the outer cylinder 8 (see FIG. 3). The inner cylinder 10 is inserted into the outer cylinder 8, the outer circumference of the outer cylinder 8 is caulked and pressed against the seal rubber 14 of the inner cylinder 10, and the compression rod bush 7 as shown in FIG. 1 is assembled. still,
Silicon oil S stored in a large amount in the D fitting 19 of the outer cylinder 8
Part of the inner cylinder 10 escapes upward from the liquid escape hole 20 shown in FIG. 4 when the A metal fitting 11 of the inner cylinder 10 is press-fitted, and the surplus portion overflows from the seal rubber 14 portion to the outside without air entering. Enclosed.

According to the structure of the above embodiment, since the outer cylinder 8 has a bottom and the silicone oil S is enclosed, the loss factor can be increased as compared with the case where the liquid is not enclosed.

The bottom wall 17 of the outer cylinder 8 has a rubber portion 18
It is configured to support a bottomed cap-shaped D metal fitting 19 via, and by fitting the A metal fitting 11 of the inner cylinder 10 into the D metal fitting 19, the inner cylinder 10 receives a large force and the outer cylinder. Even if the bottom wall 17 of No. 8 is pressed, the inner cylinder 10 is elastically supported by the rubber portion 18, so that the spring constant can be suppressed from being rapidly increased in the axial direction without being affected by the hydraulic pressure.

5 and 6 show a comparison with the conventional case in which the outer cylinder 8 has a rigid bottomed shape.

Regarding the load and deflection (axial direction) characteristics of FIG. 5, the conventional type shown by the broken line shows a sharp rise, whereas the type of this embodiment shown by the solid line has an increased linear region and appropriate characteristics. It can be seen that As for the loss factor, as shown in FIG. 6, this embodiment (solid line).
Is larger than the conventional one (broken line).

In this way, the inner cylinder 10 has a bottom shape so as to accommodate the silicon oil S, and the spring constant of the inner cylinder 10 in the axial direction is not affected by the hydraulic pressure.
It has a function of elastically supporting 0.

Next, a second embodiment of the present invention will be described with reference to FIGS.

In this embodiment, instead of the D fitting 19 of the bottom wall 17 of the outer cylinder 8 in the first embodiment, an E fitting 21 having a rubber bottom 21a is provided. Also in this embodiment, the silicone oil S can be stored in advance at the time of assembly, and the bottom wall 17 of the outer cylinder 8 can elastically support the inner cylinder 8 so that the spring constant increases rapidly. Can be prevented. In addition, regarding other configurations and operations,
Since it is similar to the embodiment, the same parts are designated by the same reference numerals and the description thereof is omitted.

Next, a third embodiment of the present invention will be described with reference to FIGS.
2 will be described.

In this embodiment, the D fitting 19 of the bottom wall 17 of the bottom cylinder 8 in the first embodiment is eliminated, and the bottom wall 17 of the outer cylinder 8 is entirely made of rubber material. This bottom wall 17
A recess 22 is provided in the recess 22.
The metal fitting 11 is adapted to be inserted.

Also in this embodiment, since the outer cylinder 8 has a bottomed shape, it is easy to put the silicon oil S therein. Even if the outer cylinder 8 has a bottomed shape, the bottom wall 17 is made of a rubber material. Since it is formed, appropriate load and deflection characteristics can be obtained even when an axial force acts on the inner cylinder 10, and the loss factor can be increased. Since the other structures and operations are the same as those of the first embodiment, the same parts are designated by the same reference numerals and the description thereof will be omitted.

[0026]

As described above, according to the present invention, since the outer cylinder has the bottomed shape, the liquid filling work can be easily performed.

Further, even if the outer cylinder has a bottomed shape, the bottom wall of the outer cylinder elastically supports the lower portion of the inner cylinder, so that the hydraulic pressure is increased by the load acting on the inner cylinder and the spring constant is increased. It is possible to prevent a sudden increase in the height, and thus it is possible to obtain an appropriate load, a flexible characteristic and a high loss factor.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the assembling state.

FIG. 3 is a sectional view of the same before caulking.

FIG. 4 is a sectional view taken along the line RR of FIG.

FIG. 5 is a load / deflection characteristic diagram of the first embodiment and a conventional example.

FIG. 6 is a graph of loss factor and frequency characteristics of the first embodiment and the related art.

FIG. 7 is a vertical cross-sectional view of the second embodiment.

FIG. 8 is a cross-sectional view showing the assembling state.

FIG. 9 is a sectional view of the same before caulking.

FIG. 10 is a vertical cross-sectional view of the third embodiment.

FIG. 11 is a cross-sectional view showing the assembly situation.

FIG. 12 is a sectional view of the same before caulking.

FIG. 13 is a plan view of a transverse link.

FIG. 14 is a vertical cross-sectional view of a conventional technique.

[Explanation of symbols]

6 ... Compression rod (vibrating member), 6a ... Rod end, 8 ... Outer cylinder, 10 ... Inner cylinder, 12 ... Elastic member, 17 ...
Bottom wall, S ... Silicone oil (liquid).

Claims (1)

[Claims] 1. A liquid is contained in a bottomed outer cylinder, and an inner cylinder, into which a rod end of a vibrating member is inserted and fixed, is fitted into the outer cylinder via an elastic member, and the bottom wall of the outer cylinder is fitted. An elastic rubber bush, in which the lower part of the inner cylinder is elastically supported.