JPH0313641Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a bush for a shock absorber.

Automobiles are equipped with a suspension that suppresses vibrations from the road surface so as not to impair ride comfort.The main components of this suspension are coil springs and shock absorbers. It has been known.

Incidentally, the shock absorber is provided with a portion for connecting the shock absorber and the axle support portion, and one known example is one provided with a tapered eye.

A shock absorber equipped with this tapered eye has a bush made of an elastic material such as rubber loaded between the eye and the pin of the axle support part that is inserted into the eye. It is designed to cope with vibration modes in which the shock absorber is displaced in a direction other than the axial direction.

Now, to explain the structure described above with reference to FIG. 3, in FIG. 3B, the taper eye 1a of the shock absorber 1 has a pin 3 on its inner surface.
The width direction of the eye 1a (the third
Symmetrical urethane rubber bushes 2 that are joined next to each other are fitted in the direction shown by arrow W in Figure B), and the pin 3 of the axle support part is inserted into the hole drilled in the center of the bushes 2. It is inserted.

Buttons 2 that are joined next to each other
The length along the width direction of the eye 1a is set to be somewhat longer than the width of the eye 1a, and in the width direction, the part protruding from the part that contacts the inner peripheral surface of the eye 1a is the width direction of the bush 2. This is set as a shrinkage margin that is contracted by tightening the nut 6 to shorten the distance between the washers 4 and 5 arranged at both ends.

Therefore, in such a structure, nut 6
By tightening, the spring constant of the bush 2 is increased, and the rigidity of the bush itself is increased to maintain its own durability.

However, since the spring constant of such bushings is high, the third
Displacement in the direction shown by arrow D in Figure B, that is, the direction in which the axis L of the shock absorber 1 is inclined toward the axial direction of the pin 3 (hereinafter referred to as displacement in the prying direction)
occurs, and if the displacement is large, the eye portion 1a
A large bending moment was generated in the shot absorber using the fulcrum as a fulcrum, resulting in damage to the shot absorber and its eye.

This invention was made in view of the above, and
The object is to provide a shock absorber bushing that eliminates the above-mentioned drawbacks.

The present invention consists of a part of the shock absorber that has a relatively high spring constant that receives the load in the axial direction, and a part that is formed integrally with this part and absorbs the displacement of the shock absorber in the prying direction to a considerably large extent. It is characterized by having a portion having a lower spring constant than the above spring constant that can be formed into a bush.

The present invention will be explained below with reference to illustrated embodiments.

In addition, in the drawings from FIG. 1 onward, the same members as those shown in FIG. 3 are designated by the same reference numerals.

In FIG. 1, a shock absorber bushing 10 has a hard part 101 and a soft part 102. As shown in FIG.

The hard part 101 is molded using hard urethane rubber with a relatively high spring constant, and has a length corresponding to the width of the eye 1a along the axial direction of the pin 3 (see Figure 2). A pin insertion hole 101a having an inner diameter that can abut or come into close contact with the outer circumferential surface of the pin 3 is bored in the center.

On the other hand, the soft part 102 is integrated with the hard part 101 so as to cover the outer periphery of the hard part 101 with a flexible member such as rubber, which has a softer hardness than the hard part 101, in other words, a smaller spring constant. The length along the axial direction of the pin 3 is set to be somewhat longer than that of the hard part 101, and the length along the axial direction of the pin 3 is set to be slightly longer than that of the hard part 101.
A hole 10 having an inner circumferential surface with a diameter larger than the outer diameter of the pin 3 in an area other than the part joined to the outer circumference of the pin 3.
2a is bored.

An eye receiving part 10 consisting of a recess is provided in a region of the outer peripheral surface of the soft part 102 facing the hard part 101.
2b is formed, and thin flaky lips 102c are formed at both ends in the axial direction.

This lip 102c, as shown in FIG.
Button 10 is set to eye 1a by washers 4 and 5.
This is to prevent dust from entering into the bush by coming into close contact with the washers 4 and 5 when held between the bushes. Further, in the area of the soft part 102 other than the part joined to the hard part in the axial direction, a gap G is formed between the inner surface of the soft part 102 and the outer circumferential surface of the pin 3, as shown in FIG. This gap is set as a deformable region, that is, a deformation absorption allowance during deformation.

In such a configuration, the bush 10 has a hard part 101 and a soft part 102 layered in this order from the outer periphery of the pin 3 outward, and the pin 3 is inserted into the pin insertion hole 101a of the hard part 101. In this state, it is held between washers 4 and 5 by tightening nut 6, and loaded and held in eye 1a.

The fastening force of the nut 6 at this time is not so strong, but is set to a level that allows the flexible portion 102 to be bent.

Reference numerals 103 and 104 in FIGS. 1 and 2 are recesses and protrusions provided on the inner surface of the hard part in the bush 10 and on the outer peripheral surface of the pin, respectively, to prevent the pin from coming off.

The bush 10 loaded in the eye 1a maintains its own durability by the hard part 101, absorbs the vibration displacement generated along the axial direction of the shock absorber 1, and prevents the bending deformation of the soft part 102. When the deflection is large, the gap G between the shock absorber 1 and the pin 3 is distorted, thereby absorbing the vibration displacement of the shock absorber 1 in the prying direction.

As described above, according to the present invention, the durability of the bush itself can be obtained by the hard part, and even when vibration displacement occurs along the prying direction of the shock absorber, the soft part with a relatively low spring constant can be used. The vibration displacement can be absorbed by causing deformation of the shock absorber and eye, so when vibration displacement occurs in the prying direction, it is possible to prevent situations where excessive bending load is applied to the shock absorber and eye. can be avoided.

In addition, this effect is furthered by improving the durability of the bushing by preventing dust from entering the air space by having the lip and washer in the bushing constantly in contact with each other. Ru. Furthermore, the above-mentioned effects are further enhanced by the fact that the lip is configured to be easily deformable, thereby preventing it from becoming sagging or deteriorating.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing an embodiment of the present invention, FIG. 2 is a schematic view showing the operation of the above-mentioned embodiment, and FIG. 3 is a schematic view of a main part of a conventional bushing. 1...Shock absorber, 1a...Ai, 1
0...Button, 101...Hard part, 101a...
...Pin insertion hole, 102...Soft part, 102a...
...hole, 102b...eye receiving part, G...void.

Claims (1)

[Scope of Claim for Utility Model Registration] A bush that is loaded into the eye of a shock absorber that is connected to an axle-side support portion of an automobile suspension by inserting a pin of the axle-side support portion, A pin insertion hole is drilled through which the pin can be inserted, and has an inner peripheral surface that abuts or comes into close contact with the outer periphery of the pin when inserted, and has a length corresponding to the width of the eye in the axial direction of the pin. a hard part with a high spring constant and placed at a position corresponding to the eye, and an eye that is integrated with the hard part so as to cover the outer periphery of the hard part and that fits and holds the eye on the outer periphery. The receiving part is formed of a flexible member having a lower spring constant than the hard part, and the length of the pin in the axial direction is longer than that of the hard part, and the part other than the joint with the hard part is A thin cylindrical lip part whose inner diameter is set larger than the outer diameter of the pin is formed in the region, so that a deformation absorption allowance consisting of a void is set between the soft part and the outer circumferential surface of the pin. and wherein the lip part is in contact with a washer that engages with the pin at a position away from the hard part, so that the cavity forms a cylindrical closed space. Button for absorber.