JPH11201209A - Vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a manufacturing cost while enhancing endurance in an elastic body. SOLUTION: An elastic body 14 having hollow parts 14A is positioned between an outer cylindrical metal fixture and an inner cylindrical metal fixture. A stopper member 22 has a pair of inserting portion 22B, each extending in parallel with the other from its base portion 22A. Each of the inserting portion 22B is inserted into the hollow portion 14A. The inserting portions 22B and the hollow parts 14A have the following relations: L1 >=L2 /2, where L1 is the length of the inserting portion 22B and L2 is the depth of the hollow part 14A; and W1 ≈W2 , where W1 is the breadth of the 22B and W2 is the breadth of the 14A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolator for preventing transmission of vibration from a member that generates vibration, and is applicable to, for example, a bush used for a suspension of an automobile.

[0002]

2. Description of the Related Art For example, an automobile suspension is provided between a tire serving as a vibration generating unit and a vehicle body serving as a vibration receiving unit. Structures are known that block transmission to the side.

As an example of a vibration isolator as a bush used for this suspension, one having a structure as shown in FIG. 5 is known.

That is, as shown in FIG. 5, a stopper member 118 is inserted between the inner cylinder 112 and the outer cylinder 114,
Excessive deformation of the elastic body 116 disposed between the inner cylinder 112 and the outer cylinder 114 is prevented.

[0005]

However, since this stopper member 118 has a structure in which a metal inter-ring 120 is contained in a rubber cushioning material 118A, metal fitting costs, adhesive costs, and metal fitting processing are required. Cost, etc., and there is a disadvantage that the manufacturing cost of the vibration isolator increases as a result.

On the other hand, the inter-ring 120 is abolished for cost reduction, and as shown in FIG.
A vibration isolator having the same shape as the stopper member 118 containing 20 and employing the stopper member 118 made of a total rubber material is also being studied.

However, in this case, even if a high-hardness rubber material is employed, the spring constant of the stopper member 118 in the direction perpendicular to the axial direction is too low, so that the stopper member 118 becomes too soft. Elastic body 1 to 118
There is a disadvantage that the deformation of the elastic body 116 after the contact of the elastic body 16 becomes large and the durability of the elastic body 116 is reduced.

The present invention has been made in view of the above circumstances, and has as its object to provide a vibration damping device that can reduce the manufacturing cost while increasing the durability of an elastic body.

[0009]

According to a first aspect of the present invention, there is provided an anti-vibration device, comprising: a tubular outer cylinder connected to one of a vibration generating section and a vibration receiving section; An inner cylinder connected to the other of the portion and the vibration receiving portion, an elastic body disposed between the outer cylinder and the inner cylinder and capable of elastic deformation, and a stopper member for preventing excessive deformation of the elastic body. Wherein the stopper member is integrally formed of a rubber material, the elastic member has a concave portion formed in a concave shape, and an insertion portion is formed in the stopper member. And the width dimension of the insertion portion of the stopper member is substantially equal to the width dimension of the curb portion.

The operation of the vibration isolator according to claim 1 will be described below. When vibration is transmitted from the vibration generating portion connected to either the outer cylinder or the inner cylinder, the elastic body disposed between the outer cylinder and the inner cylinder is elastically deformed and the vibration is attenuated by the elastic body. Is done. As a result, when the vibration is transmitted from the vibration generating unit side, the vibration is reduced by the deformation of the elastic body, and the vibration is hardly transmitted to the vibration receiving unit side.

Further, the stopper member is integrally formed of a rubber material, the elastic body has a concave portion formed with a concave portion, and the insertion portion formed on the stopper member for preventing excessive deformation of the elastic body. Is inserted into the currant portion. Further, when the insertion portion is inserted into the currant portion, the width dimension of the insertion portion is substantially equal to the width dimension of the currant portion.

That is, since the width of the insertion portion is substantially equal to the width of the currant portion, the insertion portion of the stopper member comes into close or almost close contact with the inner wall surface of the gore of the elastic body. Therefore, when the stopper member is compressed, the deformation of the currant portion in the width direction is easily restricted.

As a result, the deformation of the elastic body is suppressed by the stopper member integrally formed of the rubber material, the effect as the stopper is further increased, and the durability of the elastic body can be improved. Becomes Along with this, the deformation of the elastic body can be suppressed without inserting a metal inter-ring, so that the durability of the elastic body can be improved while eliminating the inter-ring and reducing the cost.

Further, by inserting the insertion portion into the curly portion of the elastic body, it is not necessary to separately provide the space between the elastic body and the stopper member as in the conventional vibration isolator. Therefore, it is possible to relatively increase the volume of the elastic body along the axial direction, thereby improving the degree of freedom in design.

As described above, according to the present invention, there is provided an anti-vibration device which can reduce the manufacturing cost while increasing the durability of the elastic body.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a vibration isolator according to the present invention is shown in FIGS. 1 to 4, and the present embodiment will be described with reference to these drawings.

As shown in FIGS. 1 and 2, an outer cylinder fitting 12 having a cylindrical outer frame of an anti-vibration device 10, which is a suspension pivot bush for a suspension device according to this embodiment, is formed. . The outer cylinder fitting 12 is press-fitted to the base end side of an arm (not shown) that supports the tire at the tip end side.

On the other hand, the outer tube fitting 12 is
1A, the cylindrical portion 12A constituting the main body portion has a flange portion 12B extending to the outer peripheral side at the right end side.
In addition, an inner cylindrical metal member 16 formed in a tubular shape is disposed inside the outer cylindrical metal member 12 and at a position coaxial with the outer cylindrical metal member 12.

A protruding plate 18 formed in a disc shape is welded to the right end of the inner cylinder 16 in FIG. 1A, in a direction perpendicular to the axial direction of the inner cylinder 16. The protruding plate 18 is fixed so as to extend from the outer peripheral surface of the inner cylindrical fitting 16 along the outer periphery. The inner tube fitting 16 is connected to a part of a vehicle body (not shown) by a bolt or the like.

Further, between the outer tube 12 and the inner tube 16, rubber elastic members 14 which are respectively vulcanized and bonded to the outer tube 12 and the inner tube 16 are arranged. The elastic body 14 is also vulcanized and bonded to the flange 18 and the flange portion 12B. Therefore, the elastic body 14 is also interposed between the protruding plate 18 and the flange portion 12B.

On the other hand, the elastic body 14 is formed in a deep concave shape along the axial direction of the outer cylindrical fitting 12 so that the elastic body 14 is easily deformed along a direction orthogonal to the axial direction of the inner cylindrical fitting 16. The four curled portions 14A are provided at equal intervals in the circumferential direction of the elastic body 14.

Therefore, in the direction perpendicular to the axial direction of the inner cylindrical member 16, although a large displacement occurs between the inner cylindrical member 16 and the outer cylindrical member 12, the inner cylinder along the axial direction of the outer cylindrical member 12 is formed. Displacement between the metal fitting 16 and the outer metal fitting 12 is reduced.

On the other hand, as shown in FIG. 1, the rubber stopper member 22 formed separately from the elastic body 14 is
6 and the outer tube fitting 12. That is, the base end portion 22A formed in a ring shape of the stopper member 22 and the outer peripheral side of the inner cylindrical fitting 16 are fitted, and the stopper member 22 is fixed. And this stopper member 2
2 has a pair of insertion portions 22B extending parallel to each other from the base end portion 22A, and the pair of insertion portions 22B are separated from each other by a 180 ° angle in the four currant portions 14A. Are respectively inserted into the currant portions 14A.

[0024] Here, as shown in FIG. 1, the length of the insertion portion 22B of the stopper member 22 to be inserted into the mold cavity portions 14A of the elastic body 14 and L _1, L ₂ the depth of the mold cavity portions 14A
And then, the width dimension of the stopper portion and W _1, mold cavity portions 14A
The width dimension of the and W _2, As shown in this figure, a relationship between the the L ₁ ≧ L _2/2 of the insertion length of the portion 22B L ₁ and mold cavity portions 14A depth L ₂ cage, the relationship between the the W ₁ ≒ W ₂ and the width W ₂ of width W ₁ and the mold cavity portions 14A of the insertion portion 22B, that is, with these width W ₁ and the width W ₂ have substantially equal relationship.

Next, the assembly of the vibration isolator 10 of the present embodiment will be described. When assembling the vibration isolator 10, first,
The inner cylinder fitting 16 is arranged inside the outer cylinder fitting 12 so that the elastic body 14 can be integrally vulcanized and adhered, and the elastic body 14 is vulcanized and adhered to these with the elastic body 14 as shown in FIG.

The stopper member 22 is connected to the elastic member 14.
Separately, vulcanization molding is performed as shown in FIG. 3. At this time, as shown in FIG. 4, the inner diameter D ₁ of the ring-shaped base end portion 22 A of the stopper member 22 is Diameter D ₂
It is formed slightly smaller.

Further, the inner cylinder fitting 16 is fitted into the base end portion 22A of the stopper member 22 in a press-fit state while inserting the insertion portions 22B into the counterbore portions 14A, respectively.
0 is completed.

Thereafter, the vibration isolator 10 is mounted between the vehicle body and the arm. At this time, since the inner cylindrical fitting 16 is pressed into the base end portion 22A of the stopper member 22, the stopper member 22 is There is no danger of accidentally falling off the inner tube fitting 16.

Next, the operation of the vibration isolator 10 of this embodiment will be described. When the vehicle travels and vibration is transmitted from the road surface to the outer cylinder 12 via the tires and the arms, the outer cylinder 1
The elastic body 14 arranged between the second metal fitting 2 and the inner cylinder 16 is deformed. As a result, the vibration is absorbed by the resistance based on the internal friction of the elastic body 14, and the vibration is attenuated.

Further, the elastic body 14 has a concave portion 14A formed in a concave shape, and an insertion portion 22B formed in the stopper member 22 for preventing the elastic member 14 from being excessively deformed. Inserted. Furthermore, this insertion part 2
When 2B is inserted into the currant portion 14A, the insertion portion 22B
The length of the portion inserted into the curl portion 14A is
The length of the insertion portion 22B is more than half the depth of 4A.
Is approximately equal to the width of the curly portion 14A.

That is, since the length of the insertion portion of the insertion portion 22B to be inserted into the gore portion 14A is at least half the depth of the gore portion 14A, the total rubber material of the prior art shown in FIG. The portion of the stopper member 22 that comes into contact with the elastic body 14 can be made longer than the stopper member 118, and the effect as a stopper increases.

Accordingly, since the deformation of the elastic body 14 can be suppressed without using a metal inter-ring, the elastic body 14 can be eliminated while eliminating the inter-ring and reducing the cost.
Can be improved in durability.

The width of the insertion portion 22B and the curl portion 1
4A is substantially equal to the width dimension of the insertion portion 22A.
B comes into close or almost close contact with the inner wall surface of the curly portion 14A of the elastic body 14. Therefore, when the stopper member 22 is compressed, the deformation of the insertion portion 22B in the width direction is easily restricted.

As a result, the deformation of the elastic body 14 is suppressed, the effect as a stopper is further increased, and the durability of the elastic body 14 can be further improved.

Further, by inserting the insertion portion 22B into the curving portion 14A of the elastic body 14, the conventional technology can be used as shown in FIG.
6, the elastic body 116 and the stopper member 118 are provided.
This eliminates the need for separate spaces. Therefore, it is possible to relatively increase the volume of the elastic body 14 along the axial direction, thereby improving the degree of freedom in design.

As described above, according to the present embodiment, the elastic body 1
Thus, the vibration isolator 10 which can reduce the manufacturing cost while increasing the durability of 4 is provided.

In this embodiment, the stopper member 2
2 is integrally formed of a rubber material. Therefore,
Since the stopper member 22 is formed integrally with the rubber material, the stopper member 22 can be manufactured easily while having the original function of the stopper member 22, and the manufacturing cost of the vibration isolator 10 can be further reduced.

In this embodiment, a pair of insertion portions 22B is formed. However, the insertion portions 22B are also added in a direction orthogonal to the arrangement direction shown in FIG. The structure may be such that a stopper function can be exhibited in two directions, and three or five or more insertion portions 22B may be provided. In this embodiment, the stopper member 22 is made of rubber, but may be made of a material other than rubber, such as resin.

Further, in the above embodiment, the outer cylinder side is attached to the tire side which is the vibration generating section, and the inner cylinder side is attached to the vehicle body side which is the vibration receiving section. Good.

In the above embodiment, the purpose of the present invention is to provide vibration damping for a suspension of an automobile, but the vibration damping device of the present invention can be used for other purposes.
Further, the shape and the like are not limited to those of the embodiment.

[0041]

As described above, the vibration isolator according to the present invention can reduce the manufacturing cost while increasing the durability of the elastic body.

[Brief description of the drawings]

FIG. 1 is a diagram of an embodiment of a vibration isolator according to the present invention, wherein (A) is a cross-sectional view taken along the line 1A-1A of FIG. 2;
(B) is a left side view.

FIG. 2 is a right side view of an embodiment of the vibration isolator according to the present invention.

FIG. 3 is a perspective view of a stopper member applied to one embodiment of the vibration isolator according to the present invention.

FIG. 4 is a cross-sectional view for explaining the assembling of one embodiment of the vibration isolator according to the present invention.

FIG. 5 is a cross-sectional view showing a first conventional vibration damping device.

FIG. 6 is a view showing a second conventional vibration damping device,
(A) is a sectional view, and (B) is a left side view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vibration isolator 12 Outer cylinder 14 Elastic body 14A Curtain part 16 Inner cylinder 22 Stopper member 22B Insertion part

Claims (1)

[Claims] A cylindrical outer cylinder connected to one of the vibration generator and the vibration receiver; and an inner cylinder disposed on the inner peripheral side of the outer cylinder and connected to the other of the vibration generator and the vibration receiver. And an elastic body disposed between the outer cylinder and the inner cylinder and capable of elastic deformation,
A stopper member for preventing excessive deformation of the elastic body,
A stopper member is integrally formed of a rubber material, an elastic body has a concave portion formed in a concave shape, and an insertion portion is formed in the stopper member. Wherein the width of the insertion portion of the stopper member is substantially equal to the width of the gore portion.