JPS60215135A - Rubber bushing - Google Patents

Abstract

PURPOSE:To greatly improve damping performance of axial vibration, by inclining inner wall surfaces extending in the axial direction of plural liquid chambers formed inside relative to an axis of sleeves. CONSTITUTION:A rubber elastic material 3 is inserted between inner and outer sleeves 2 and 1 to connect the same with each other, and two axially separated liquid chambers 4 and 5 are defined in the rubber elastic material 3. Both the liquid chambers 4 and 5 are connected with each other by a communication channel 6a as a communication hole for allowing communication of a damping oil 7 so as to damp vibration. Wall surfaces 4a and 5a of the liquid chambers 4 and 5 perpendicular to an axis of the inner and outer sleeves 2 and 1 are parallel to each other, and wall surfaces 4b and 5b on the axial side extending in the axial direction of the sleeves are inwardly inclined toward both ends thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rubber bush used for automobile suspensions and the like, and particularly relates to improving its axial damping performance.

[Prior art]

Generally, rubber bushings used in automobile suspensions consist of an outer cylinder, an inner cylinder, and a rubber elastic body that connects the inner and outer cylinders, and it absorbs vibrations from the road surface while maintaining steering stability to provide a comfortable ride. In order to improve the riding comfort, it is necessary to sufficiently absorb the vibrations and attenuate them quickly.

Therefore, as described in Japanese Patent Laid-Open No. 56-73239, as a rubber bushing capable of improving the above-mentioned damping performance, conventional rubber bushings have been developed which are made of a rubber elastic body and are arranged on the link side and the opposite side through the axis of the bushing. There is one in which a hollow chamber is provided, the rain hollow chamber is filled with liquid, and the rain hollow chamber is communicated with through a communication hole. This was designed to improve the damping force in the direction perpendicular to the axis of the bushing by utilizing the orifice effect when the liquid moves from one hollow chamber through the communication hole to the other hollow chamber.

By the way, in automobiles, vibrations occur not only in the direction perpendicular to the axis of the rubber bushing but also in the axial direction, and especially during sudden starts or sudden braking, the vibration in the axial direction becomes large, causing Rubber bushings used in parts that are subject to axial vibrations need to have the same axial vibration isolation and damping performance as above, but the rubber bushings with the conventional structure described above have a high damping performance in the axial direction. No particular consideration was given to improving strength.

[Purpose of the invention]

The present invention was made in such a conventional situation,
The object of the present invention is to provide a rubber bushing that can improve the damping performance of vibrations in the axial direction.

[Structure of the invention]

The present invention provides a rubber bushing in which, in a rubber elastic body,
At least two liquid chambers are provided in the axial direction of the rubber bush, the inner wall surface of each liquid chamber extending in the axial direction is inclined with respect to the axis, and the two liquid chambers are communicated through a communication hole. When axial vibration occurs as a result, the axial vibration is damped by the orifice effect when the liquid chamber deforms and the liquid moves within the communication hole. .

〔Example〕

° Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show an embodiment of the present invention. In the figures, 1 is a cylindrical outer cylinder, which has a moxibustion center part 1a, an end part 1b with a smaller diameter, and a central part 1b. and an inclined part IC that connects the two. Reference numeral 2 denotes an inner cylinder disposed within the outer cylinder 1, which has a central portion 2 similar to the outer cylinder 1.
a, an end portion 2b and an inclined portion 2C, and the inner and outer cylinders 2
, 1 are aligned. In addition, the above inner and outer cylinders 2 and 1
A rubber elastic body 3 is inserted between the two to connect them.
The inner and outer surfaces of the elastic body 3 are baked and fixed to the inner and outer tubes 2.1, respectively, and both end surfaces of the rubber elastic body 3 have locking portions 1d bent and formed at the ends of the outer tube 1. It is locked.

Further, liquid chambers 4 and 5 are recessed in the inclined portion IC120 of the rubber elastic body 3, and the liquid chambers 4 and 5 have a generally diamond-shaped cross section and an annular shape concentric with the inner cylinder 2 when viewed from the front. belongs to. The inner wall surface 4a of this liquid chamber 4.5 is perpendicular to the axis of the outer cylinder 2.1.

5a are parallel to each other, and the axis side wall surfaces 4b, 5b extending in the axial direction are inclined inward toward both ends, and the inclined portion IC of the outer cylinder 1 is parallel to the liquid. These are the outer wall surfaces 4c, 5c of the chamber 4.5.

Further, a cylindrical communication ring 6 is inserted between the liquid chambers 4 and 5 of the rubber elastic body 3 in contact with the outer cylinder 1, and a communication groove 6a extending in the axial direction is formed in the outer circumference of the communication ring 6. This serves as a communication hole that communicates the two liquid reservoirs 4 and 5. This communication hole 6a and both fluid chambers 4
．． 5 is filled with damping oil 7 for damping vibrations. Note that 8 is a seal ring for preventing leakage of the damping oil 7 in the fluid reservoir 4.5.

Next, the operation will be explained.

Let us consider a case where an axial load is applied to the rubber bushing of this embodiment and vibration occurs in the axial direction. This load causes the outer cylinder 1 to move relative to the inner cylinder 2, for example, in the direction shown by the arrow in FIG. In this case, if the axis side wall surfaces 4b, 5b and the outer wall surfaces 4c, 5c of the liquid chambers 4, 5
If they are parallel to the axial direction, the volume of the liquid chamber 4.5 will not change due to the above movement, but in this embodiment, the walls 4b, 5b, 4c, '5c are inclined. Therefore, the volume of the liquid chamber 4 decreases a little, and the volume of the fluid chamber 5 increases by that amount, and as a result, a part of the damping oil 7 in the liquid chamber 4 moves into the liquid chamber 5 through the communication groove 6a. However, the vibration in the axial direction is attenuated by the orifice effect at this time.

In this way, in this embodiment, when vibration occurs in the axial direction, the above-mentioned two fluid plates 4.5 are deformed and the damping oil 7 moves within the communication groove 6a, so that the damping force of the vibration in the axial direction is reduced. You can improve.

FIG. 3 is for explaining an application example of the rubber bushing of the above embodiment. In the figure, 11 is a spindle that supports a rear wheel 12. The spindle 11 is supported by a spindle arm 17, and the spindle arm 17 is not shown in the figure. No coil spring.

It is attached to the vehicle body via a shock absorber,
Further, one end of a lateral link 18 is connected to the front and rear ends of the spindle arm 17, and the other end of the lateral link 18 is connected to a link attachment part 19 of the vehicle body. rubber bushing 20
is provided with its axis in the longitudinal direction of the vehicle body (up and down in the figure).

Reference numeral 13 designates a trailing link 13 provided between the spindle arm 17 and the link support portion 14 of the vehicle body.
A bushing 16.15 is provided at the connection portion with.

In this application example, when a car suddenly accelerates or brakes, a large load acts in the longitudinal direction of the car body, which causes vibrations in the axial direction of the rubber bushing 20, but this vibration is easily suppressed by the damping car of the rubber bushing 20. It will be attenuated to .

In addition, in the above embodiment, the axis side wall surface 4b of the liquid chambers 4, 5,
5b and the outer wall surfaces 4c and '5c are inclined, but in the present invention, the wall surfaces 4b, 5b or 4c are inclined.
It is sufficient that either one of c and 5c is inclined, and this produces the same effect as the above embodiment.

Further, in the above embodiment, the case where two liquid chambers are provided has been described, but the number of liquid chambers is not limited to two.
There may be three or more.

〔Effect of the invention〕

As described above, according to the rubber bushing of the present invention, at least two liquid chambers are provided in the rubber elastic body in communication with each other in the axial direction through the communication holes, and the inner wall surface extending in the axial direction of each liquid chamber is aligned with the axis. Since it is inclined to the opposite direction, it has the effect of greatly improving the damping performance of vibrations in the axial direction.

[Brief explanation of drawings]

FIG. 1 is a sectional side view of a rubber bushing according to an embodiment of the present invention, FIG. 2 is a partially sectional front view thereof, and FIG. 3 is a plan view of an automobile suspension to which the rubber bushing of the above embodiment is applied. 1... Outer cylinder, 2... Inner cylinder, 3... Rubber elastic body, 4
．． 5...Liquid chamber, 4b, 4c, 5b, 5c...Inner wall surface, 6a...Communication hole, 7...Liquid. Patent Applicant: Toyo Kogyo Co., Ltd. Agent, Patent Attorney Ken Hayase - Figure 1, Figure 2, Figure 3)

Claims (1)

[Claims] (1) In a rubber bushing consisting of an outer cylinder, an inner cylinder, and a rubber elastic body connecting the inner and outer cylinders, at least two liquid chambers filled with liquid are provided in the axial direction of the rubber bushing, and the two liquid chambers are in communication with each other. A rubber bushing, wherein the liquid chambers are communicated with each other through holes, and each of the liquid chambers has an inner wall surface extending in the axial direction of the rubber bushing and is inclined with respect to the axis of the rubber bushing.