JPH11182600A - Vibration isolating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost through utilization common pats of outer members of two bushes when the twisting effect is present in a vibration isolating device using two brushes, and to regulate the displacement. SOLUTION: In a vibration isolating device where two bushes 11, 12 provided with rubbers 9, 10 between inner members 5, 6 and outer members 7, 8 on the end side of which outwardly extending flange parts 1 to 4 are formed, are press-fitted in a hole 13A in a bracket 13 with the other end sides opposite to each other so that the inner members 5, 6 are concentric with each other, the outer members 7, 8 of the bushes 11, 12 are formed of the same dimensions so as to realize the common parts, and when the drawing is achieved to reduce the radial dimension of the bushes 11, 12, one bush 12 is drawn deeper than the other bush 11 to reduce the diameter of the outer member 8, and the diameter of the hole 13A in the racket 13 is also different according to the diameter of the outer members 7, 8 of the bushes 11, 12 to be press-fitted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration device suitable for use as an automobile bush.

[0002]

2. Description of the Related Art As a vibration isolator of this type, an arm 10 is provided on a link 100 provided on a rear wheel of an automobile as shown in FIG.
1 and two bushes 103, 10 are inserted into holes 102A of a bracket 102 provided on the distal end side of the arm 101.
4 is known. FIG.
3 and 104, showing inner members 107 and 108 formed with flange portions 105 and 106 extending to one end respectively.
Rubber 111, 112 between the outer member 109 and 110
The inner ends 107 and 108 are press-fitted into the holes 102A of the bracket 102 with their other ends facing each other so as to be coaxial. A mounting shaft (not shown) is inserted into the inner members 107 and 108, and two bushes 103 and
104 is attached. When the twisting action works on this mounting shaft,
The center O of the twisting is on one bush 103 side. In addition, as shown in FIG.
The outer diameters of the outer members 109 and 110 are the same, for example, an outer diameter of 37 mm.

[0003]

If the outer diameters of the two bushes are the same, the center O of the twist is deviated, so that when the input from the X direction is received in FIG.
The displacement amount was larger and it was difficult to regulate the displacement. Therefore, the outer member 10 of the two bushes 104
It has been proposed to change the outer diameter of 9,110, but if the outer diameter is changed, the parts cannot be shared and the cost is increased.

In view of the above, the present invention has been made so that when a twisting action is effected in a vibration isolator using two bushes, the outer members of the two bushes are made into a common component to reduce costs and to sufficiently regulate displacement. It is an object of the present invention to provide an anti-vibration device.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention is directed to a two-piece structure in which rubber is provided between an inner member and an outer member each having a flange portion extending outward at one end. In a vibration isolator in which the other bush is pressed into the hole of the bracket with the other end facing so that the inner member is coaxial,
The outer member of each bush is formed with the same dimensions to make parts common, and when performing drawing in order to reduce the radial dimension of each bush, one bush is drawn deeper than the other bush. The diameter of the outer member is formed small,
The hole diameter of the bracket is also varied according to the diameter of the outer member of each bush to be press-fitted.

[0006]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

In the embodiment shown in FIG. 1, rubbers 9 and 8 are provided between inner members 5 and 6 and outer members 7 and 8 having outwardly extending flange portions 1, 2, 3 and 4 formed at one end thereof. Holes 13A of the bracket 13 are opposed to the other bushings 11 and 12 with the other members so that the inner members 5 and 6 are coaxial.
Press fit. The outer diameter dimension b of the outer member 7 in a state of being press-fitted into the hole 13A is larger than the outer diameter dimension c of the outer member 8. Therefore, hole 13A of bracket 13
Also, the hole diameter of the side into which the bush 11 is
Is formed larger than the hole diameter for press-fitting.

FIG. 2 is a plan view of FIG. 1, in which a pair of recesses 14 are formed in a plate-like flange portion 1 having rounded rectangular corners. Similarly, a recess 15 is also formed in the disk-shaped flange portion 2 of one bush 12. AA of FIG.
The line cross section is FIG.

FIG. 3 shows the bush 11 before press-fitting.
Is a cross section taken along line BB in FIG. The rubber 9 is formed with a pair of bulges 16 and 17 along the axial direction.
The outer diameter of the outer members 7, 8 of each of the bushes 11, 12 before drawing is 38.6 mm, and the outer members 7, 8 are formed to have the same dimensions so that parts can be shared. When performing drawing in order to reduce the radial dimension of 8, the one bush 12 is squeezed deeper than the other bush 11 (by increasing the drawing ratio) so that the diameter of the outer member 8 is smaller than the diameter of the outer member 7. Are also formed smaller. As a result, when the bracket 13 shown in FIG. 1 is pressed into the hole 13A, the outer diameter b of the outer member 7 is 37 mm, and the outer diameter c of the outer member 8 is 35 mm. The metal fitting members (the inner member and the outer member) of the bushes 11 and 12 before the drawing process are completely the same.
As a result, parts can be shared.

The curving portion 10A of the rubber 10 of one bush 12 is formed over the entire circumference, but may be the same as the curving portions 16 and 17 in some cases.
The rubbers 9 and 10 are vulcanized by setting a metal member in a mold and may be formed in the same shape according to the application as well as different shapes as in the illustrated embodiment.

[0011]

As described above, according to the present invention, the outer members of the respective bushes are formed to have the same dimensions, so that parts can be shared, and the diameter of each bush is reduced in order to reduce the radial dimension. When processing, one bush is squeezed deeper than the other bush to reduce the diameter of the outer member, and the hole diameter of the bracket is varied according to the diameter of the outer member of each bush to be press-fitted. Can be achieved and cost can be greatly reduced. In addition, even if parts are shared, the spring constant of each bush is made different by making the drawing ratio different in drawing, and even when a twisting force is applied, the displacement amount of the whole vibration isolator is accurately regulated. can do. That is, in the bush in which the drawing ratio is increased, the distance between the inner member and the outer member is reduced, whereby the displacement can be restricted and the durability of the rubber is improved.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along line AA of FIG. 2 showing a preferred embodiment of the present invention.

FIG. 2 is a plan view.

FIG. 3 is a front view of a bush.

FIG. 4 is a sectional view taken along line BB of FIG. 3;

FIG. 5 is a schematic diagram showing an example of mounting the vibration isolator.

FIG. 6 is a half sectional view of a place where the vibration isolator is used.

FIG. 7 is a sectional view showing a conventional example of a vibration isolator.

[Explanation of symbols]

 1,2,3,4 Flange part 5,6 Inner member 7,8 Outer member 9,10 Rubber 11,12 Bush 13 Bracket 13A Hole

Claims (1)

[Claims] A rubber is provided between an inner member and an outer member each having a flange portion extending outward on one end side.
In a vibration isolator in which two bushes are press-fitted into the holes of the bracket with the other ends facing each other so that the inner members are coaxial, the outer members of each bush are formed to have the same dimensions to achieve commonality of parts, When performing drawing in order to reduce the radial dimension of each bush, one bush is squeezed deeper than the other bush to form a smaller outer member diameter, and the hole diameter of the bracket is also press-fitted. An anti-vibration device characterized in that it is made different according to the diameter of the outer member.