JPH08254242A - Vibration control device - Google Patents

Abstract

PURPOSE: To provide an antirattler in which a cover member and an elastic body are assuredly joined to each other without using any adhesive. CONSTITUTION: An inner cylinder metal fitting 14 is arranged inside an outer cylinder integral bracket 12 integrally formed of synthetic resin, and an elastic body 16 is arranged between the inner cylinder metal fitting 14 and the bracket 12. A reinforcing cylinder consisting of a pair of ring members and a pair of connecting members 32B with which these ring members are engaged, is embedded in a part which is positioned to the outer circumferential side of the elastic body 16. An orifice 36 is communicated between a main liquid chamber 34 and an auxiliary liquid chamber 38, and a resin flow-in preventing cover 30 is fitted to the elastic body 16. When fitted, the elastic body 16 is reinforced by the reinforcing cylinder so that the resin flow-in preventing cover 30 is arranged in a joint part between the bracket 12 and the elastic body 16 under such a condition that it is assuredly joined to the elastic body 16.

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 applied to, for example, automobiles, general industrial machines, etc., to absorb vibrations from a vibration generating part, and in particular, an outer cylinder and a bracket are formed as an integral resin molded product. Regarding a vibration control device.

[0002]

2. Description of the Related Art For example, a vibration-damping device as an engine mount is arranged between an engine, which is a vibration generating portion of a vehicle, and a vehicle body, which is a vibration receiving portion. The vibration device absorbs the vibration and prevents the vibration from being transmitted to the vehicle body.

As this type of vibration damping device, a bush type vibration damping device such as a liquid filled type is known. In such a bush type vibration damping device, an elastic body made of a tubular rubber material is vulcanized and adhered to the outer periphery of the inner cylinder, and this is further inserted into the outer cylinder and liquid is injected into the outer cylinder. After that, in order to prevent the outer cylinder from coming off and to seal the outer cylinder, the end portion of the outer cylinder is drawn. And the outer cylinder after attaching the inner cylinder,
It is press-fitted into the bracket and attached to the car body.

However, demands for cost reduction and weight reduction due to reduction of the number of parts and assembling man-hours have become strong in recent years, and as the use of resin for the parts has been examined,
A structure has been conceived in which a resin is injection-molded on the outer peripheral side of an elastic body having an inner cylinder, and a bracket integrated with the outer cylinder is arranged around the elastic body.

[0005]

However, such a vibration isolator has a structure in which an elastic body is put in a mold and a resin is molded on the outer peripheral side of the elastic body, and the outer periphery of the elastic body is covered with the resin. . Therefore, at the time of manufacturing, a metal cover material is installed on the outer peripheral side of the elastic body in which a liquid chamber for containing the liquid is formed, and the liquid chamber is sealed with the cover material. It is conceivable to mold the resin by putting it in a mold. However, if the cover material is simply installed on the outer peripheral side of the elastic body, the adhesion between the cover material and the elastic body will be insufficient. Therefore, when vibration is transmitted, the elastic body of the portion contacting the cover material is transmitted. However, it is conceivable that the liquid may be deformed more than necessary to reduce the durability, or the liquid in the liquid chamber may leak out between the cover member and the elastic body.

Therefore, the cover material can be fixed to the elastic body by adhering the cover material to the elastic body after vulcanization of the elastic body, but in this case, a step of applying the adhesive is required, and the vibration isolator Had the drawback of increasing the manufacturing cost. Further, when the elastic body and the cover material are bonded with an adhesive, conditions such as pressure bonding force and heat aging have a great influence on the bonding force, so it is necessary to strictly control the processing conditions to ensure the reliability of the bonding. And the manufacturing cost of the anti-vibration device may be further increased.

In view of the above facts, an object of the present invention is to provide a vibration damping device in which a cover material and an elastic body are securely joined without using an adhesive.

[0008]

According to a first aspect of the present invention, there is provided a vibration isolator, a bracket directly connected to one of a vibration generating portion and a vibration receiving portion and integrally formed with resin, a vibration generating portion and a vibration receiving portion. An inner cylinder connected to the other of the parts and arranged inside the bracket, and an elastic body arranged between the bracket and the inner cylinder so as to connect the bracket and the inner cylinder, A liquid chamber in which at least a part of an inner wall is formed of the elastic body and in which a liquid is sealed; and a reinforcing member arranged between the bracket and the inner cylinder in a state of being vulcanized and bonded to the elastic body, And a cover member that is disposed so as to be interposed on a joint surface between the bracket and the elastic body.

[0009]

The operation of the vibration isolator according to claim 1 will be described below.

Since the elastic body connects between the bracket and the inner cylinder, and the inner cylinder or the bracket is connected to the vibration generating portion, when the vibration is transmitted from the vibration generating portion side to the inner cylinder or the bracket, the elastic body is elastic. The body is deformed, and as a result, the deformation of the elastic body attenuates the vibration, making it difficult to transmit the vibration to the vibration receiving portion side connected to the bracket or the inner cylinder.

Further, the liquid chamber expands and contracts with the deformation of the elastic body, and the liquid in the liquid chamber undergoes pressure change and viscous resistance.
The vibration is damped not only by the deformation of the elastic body but also by the pressure change of the liquid, the viscous resistance and the like, so that the vibration is more difficult to be transmitted to the vibration receiving portion side.

On the other hand, in manufacturing the vibration isolator according to the present invention, since the bracket is integrally formed of resin, the vibration isolator can be made lightweight and the bracket and the outer cylinder need to be processed by pressing or the like. As a result, the number of parts can be reduced and the number of assembly steps can be reduced to reduce costs.

The reinforcing member vulcanized and bonded to the elastic body is arranged between the bracket and the inner cylinder, and the cover material is arranged on the joint surface between the bracket and the elastic body.

Therefore, even if excessive vibration is input to the vibration isolator, since the elastic member in the portion in contact with the cover material is reinforced by the reinforcing member, it is deformed away from the cover material more than necessary and is durable. There is no loss of sex. Since the elastic member and the cover member are securely joined by the reinforcing member, the liquid in the liquid chamber does not leak out between the elastic member and the cover member.

Therefore, when covering the outer peripheral surface of the elastic body with the cover material, it is not necessary to bond the elastic body and the cover material with an adhesive, and the cost of the vibration isolator can be further reduced.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vibration isolator according to a first embodiment of the present invention is shown in FIGS. 1 to 8, and this embodiment will be described with reference to these drawings.

As shown in FIG. 1, a vibration isolator 1 of this embodiment.
Reference numeral 0 denotes a bracket 12 integrally formed with an outer cylinder, which is integrally molded of synthetic resin, and has an annular shape of the bracket 12 toward a vehicle body (not shown) side of a vehicle such as an automobile serving as a vibration receiving portion. From the main body portion 12A formed on the
B is formed to project. And this mounting portion 12
This bracket 12 is screwed to the vehicle body using an embedded nut 13 fixed to B. Therefore, the bracket 12 is connected to the vehicle body.

As shown in FIGS. 1 to 3, inside the main body 12A of the bracket 12, an inner tubular metal fitting 14 formed in a tubular shape is arranged so as to be parallel to the axis of the bracket 12. By screwing a bolt (not shown) into the inner tubular metal piece 14, the inner tubular metal piece 14 and the engine (not shown) serving as the vibration generating portion are connected.

Further, the inner tube fitting 14 and the bracket 1
An elastic body 16 made of rubber is disposed between the second main body portion 12A and the inner tubular metal fitting 14 so as to connect the inner tubular metal fitting 14 and the bracket 12 to each other. The elastic body 16 is vulcanized and adhered to the outer peripheral surface of 14.

At the outer peripheral side of the elastic body 16, as shown in FIG. 6, a reinforcing member made of steel composed of a pair of ring members 32A and a pair of connecting members 32B connecting the ring members 32A. The reinforcing cylinder 32 is embedded, and the reinforcing cylinder 32 reinforces the portion of the elastic body 16 near the outer periphery.

As shown in FIG. 1, a recess 18 is formed in the axially intermediate portion of the elastic body 16 located between the pair of ring members 32A and below the inner tubular metal member 14. . Similarly, a pair of recesses 24 smaller than the recesses 18 are formed in the axially intermediate part of the elastic body 16 and on the diagonally upper left and right sides of the inner tubular member 14.

On the other hand, in the axially intermediate portion on the outer peripheral side of the elastic body 16, the above-mentioned connecting members 32B are embedded respectively,
These connecting members 32B reinforce the portion of the elastic body 16 near the outer periphery of the intermediate portion in the axial direction.

Further, as shown in FIG. 4, a connecting member 32B is provided.
A wide and shallow shallow groove 28 extending along the circumferential direction of the elastic body 16 is formed in the portion of the elastic body 16 that covers the outer peripheral side of the elastic body 16. A pair of grooves 22 extending along the direction are formed respectively.
One end of each groove 22 is connected to the recess 18, and the other end is connected to each of the pair of recesses 24.

As shown in FIGS. 1 to 4, a stopper member 17 extending in the axial direction of the elastic body 16 is connected to the elastic body 16, and the elastic body 16 also has the above-mentioned recessed portion. A diaphragm 26, which is a pair of thin elastic films forming 24, extends while sandwiching the stopper member 17.

With the above-described structure, the through hole 20 penetrating in the axial direction of the elastic body 16 is formed between the elastic body 16 and the pair of diaphragms 26. Inner cylinder fitting 1 in the vertical direction, which is the main vibration direction of 10
4 is easily displaced.

Further, as shown in FIG. 4, the shallow groove 28 serves as a cylindrical cover material as shown in FIG. 4, which covers the recess 18, the groove 22 and the recess 24 along the outer peripheral surface of the elastic body 16. The resin inflow prevention cover 30 is fitted.

The resin inflow prevention cover 30 is formed by cutting a metal round pipe into a predetermined length.
However, the inner diameter of the resin inflow prevention cover 30 is not limited to the shallow groove 28.
Initially formed to be larger than the outer diameter of the portion, the elastic body 16 is easily inserted from the axial direction. Then, with the elastic body 16 arranged in the resin inflow prevention cover 30,
By drawing the resin inflow prevention cover 30, the resin inflow prevention cover 30 is fitted to the elastic body 16 so as to be in close contact with the shallow groove 28. On this occasion,
Since the elastic body 16 is reinforced by the reinforcing cylinder 32,
It does not deform significantly, and the resin inflow prevention cover 3
0 and the elastic body 16 are securely fitted.

As described above, the resin inflow prevention cover 30 is arranged at the joint between the bracket 12 and the elastic body 16 while being interposed. Since the resin inflow prevention cover 30 is thus arranged on the outer peripheral surface side of the elastic body 16, the elasticity of the outer peripheral surface of the resin inflow prevention cover 30 and the portion not covered by the resin inflow prevention cover 30 is increased. The outer peripheral surface of the body 16 is bonded to the inner peripheral surface of the main body portion 12A of the bracket 12.

On the other hand, when the resin inflow prevention cover 30 is fitted in the shallow groove 28, the recess 18 is closed by the resin inflow prevention cover 30 as shown in FIGS. A chamber 34 is formed, the groove 22 is closed by the resin inflow prevention cover 30 to form an orifice 36 as a restriction passage, and the pair of recesses 24 is closed by the resin inflow prevention cover 30 to form a pair of auxiliary liquid chambers 38. Configure. Therefore, the orifice 36 communicates between the main liquid chamber 34 and the sub liquid chamber 38, and the pair of diaphragms 26 respectively configure part of the partition walls of the pair of sub liquid chambers 38.

A liquid such as water or oil is sealed in the main liquid chamber 34, the orifice 36 and the sub liquid chamber 38.

Next, the assembly of the vibration isolator 10 according to this embodiment will be described. At the time of assembling the vibration isolator 10, as shown in FIG. 5, a pair of ring members 32A is formed in advance, and further, a pair of connecting members 32B connecting between the pair of ring members 32A is pressed or the like. It is formed by punching and is processed and curved in an arc shape so as to match the curvature shape of the ring material 32A.

Then, the pair of ring members 32A and the pair of connecting members 32B are joined by spot welding or the like as shown in FIG. 6 to form the reinforcing cylinder 32. As a result, the reinforcing cylinder 32 can be obtained easily and at low cost.

Thereafter, with the reinforcing cylinder 32 arranged on the outer peripheral side of the inner tubular metal fitting 14, the elastic body 16 is moved to the inner tubular metal fitting 14
4 is vulcanized and adhered to the periphery of the elastic body 16, and the elastic body 16 is axially inserted into the resin inflow prevention cover 30 at a position facing the shallow groove 28 of the elastic body 16. The resin inflow prevention cover 30 is arranged. And
The resin inflow prevention cover 30 is drawn and fitted tightly into the shallow groove 28 of the elastic body 16 as shown in FIG. 7, and the inner peripheral surface of the resin inflow prevention cover 30 and the shallow groove 28 are joined.

Next, the elastic body 16 in which the resin flow prevention cover 30 as shown in FIG. 7 is fitted and the embedded nut 13 are loaded into a predetermined position in a bracket molding mold (not shown) and melted. The synthetic resin is injected into the mold. As a result, the synthetic resin is embedded in the embedded nut 1.
3, the bracket 12 that is bonded to the outer peripheral portions of the elastic body 16 and the resin inflow prevention cover 30 and is integrated with the embedded nut 13, the elastic body 16 and the resin inflow prevention cover 30 is formed.

At this time, the resin inflow prevention cover 30 is pressed by the injection pressure so as to come into close contact with the outer periphery of the elastic body 16, so that the recess 18,
Since the resin material is prevented from entering the groove 24 and the groove 22, the main liquid chamber 3 can be easily provided between the bracket 12 and the elastic body 16.
4, the sub liquid chamber 38 and the orifice 36 can be created.

After that, the bracket 12 is taken out of the mold, a predetermined liquid is injected into the inside through a liquid injection port (not shown) formed in the bracket 12, and sealed with a rivet (not shown) to complete the assembly of the vibration isolator 10. To do.

The bracket 12 of the vibration isolator 10 thus completed is screwed and connected to the vehicle body side of the automobile, and the inner cylindrical metal fitting 14 is connected to the engine through bolts. When the vibration isolator 10 is installed in the vehicle body, a force due to the load of the engine is applied to the inner tubular metal fitting 14, so that the inner tubular metal fitting 14 is substantially coaxial with the bracket 12.

Next, the operation of this embodiment will be described. When the engine mounted on the inner tubular member 14 is operated, the vibration of the engine is transmitted to the elastic body 16 via the inner tubular member 14. The elastic body 16 acts mainly as a vibration absorber, absorbs the vibration by the damping function based on the internal friction of the elastic body 16, and makes it difficult to transmit the vibration to the vehicle body side.

Further, as the elastic body 16 is deformed, the main liquid chamber 3
4 expands and contracts, and accordingly, a pair of auxiliary liquid chambers 38 connected to each other via a pair of orifices 36 are respectively formed in the diaphragm 2
Since the liquid expands and contracts due to the deformation of No. 6, the liquid flows through the orifice 36, and the vibration damping effect can be improved by the damping action based on the viscous resistance of the liquid flow and the liquid column resonance.

On the other hand, when the vibration isolator 10 according to this embodiment is manufactured, since the bracket 12 is integrally molded with resin, the vibration isolator 10 can be made lighter and the bracket and the outer cylinder can be pressed. Since it is no longer necessary to process in, the number of parts can be reduced and the number of assembling steps can be reduced to reduce the cost.

Further, in the present embodiment, the reinforcing cylinder 32, which is vulcanized and adhered to the outer peripheral side of the elastic body 16, is arranged between the bracket 12 and the inner tubular metal member 14, and further, the elastic cylinder 16 and the elastic member 16 are elastic. The resin inflow prevention cover 30 is arranged on the joint surface between the body 16 and the body 16.

Therefore, even if an excessive vibration is input to the vibration isolator 10, the elastic body 16 in the portion in contact with the resin inflow prevention cover 30 is reinforced by the reinforcing cylinder 32.
It is prevented from being deformed more than necessary from the resin inflow prevention cover 30 and the durability of the elastic body 16 is not deteriorated. Since the resin inflow prevention cover 30 and the elastic body 16 are securely joined to each other by the reinforcing cylinder 32, the liquid in the liquid chambers 34, 38 and the orifice 36 is removed from between the resin inflow prevention cover 30 and the elastic body 16. It will not leak out.

Therefore, when covering the resin inflow prevention cover 30 on the outer peripheral surface of the elastic body 16, it is not necessary to bond the elastic body 16 and the resin inflow prevention cover 30 with an adhesive, and the cost of the vibration isolator 10 is reduced. You will be able to further down.

As a modification of the present embodiment, the one shown in FIG. 8 can be considered. That is, since the orifice 36 is formed in the narrow space between the connecting member 32B of the reinforcing cylinder 32 and the resin inflow prevention cover 30, the orifice 3 is formed.
The plate thickness of the reinforcing cylinder 32 must be increased so that the function of the restriction passage 6 is not impaired. However, by making the portion of the connecting material 32B corresponding to the orifice 36 indent one step toward the inner peripheral side as shown in the figure, it becomes possible to easily secure the cross-sectional area of the orifice 36.

Next, a vibration isolator according to a second embodiment of the present invention is shown in FIGS. 9 and 10, and this embodiment will be described with reference to these drawings. The same members as those described in the first embodiment are designated by the same reference numerals, and the duplicate description will be omitted.

The vibration damping device 10 according to this embodiment employs a reinforcing cylinder 52 as shown in FIG. 10 instead of the reinforcing cylinder 32 of the first embodiment.

In the manufacturing process of the reinforcing cylinder 52, first, as shown in FIG. 9, a plate-like member 54 having notches 56 at both ends and a rectangular hole 58 at the center is formed. Punching from the material by pressing,
A flat member is formed. Further, the portion that serves as a connecting material between the cutout portion 56 and the hole portion 58 is bent, and thereafter,
As shown in FIG. 10, the reinforcing cylinder 52 is formed by rounding and joining both ends by spot welding or the like.

As a result, if the reinforcing cylinder 52 of this embodiment is adopted, not only the same operation as in the first embodiment is achieved, but also
The manufacturing of the reinforcing cylinder is simplified, and the cost can be further reduced.

In the above embodiment, the bracket 12 is connected to the vehicle body side which is the vibration receiving portion, and the inner tubular metal piece 14 is connected to the engine side which is the vibration generating portion. Also good.

Further, in the above embodiment, the inner cylinder is made of metal fittings, but it may be made of resin, and as the kind of resin material used in the above embodiment, ABS, polyacetal, etc. are considered. Is not limited to. Further, in the above embodiment, the vibration isolator having the main liquid chamber and the pair of sub liquid chambers has been described as an example, but it goes without saying that the present invention can be applied to a vibration isolator having one liquid chamber. It may be a type having one chamber.

Then, the reinforcing cylinder 32 serving as a reinforcing member,
In the present embodiment, the material of 52 is steel, for example,
Other metal materials such as aluminum may be used, and further other materials such as resin materials may be used.

On the other hand, the liquid injection port for injecting the liquid into the vibration isolator may be provided in the resin inflow prevention cover 30 in advance, or the liquid injection port may be formed after the bracket 12 is molded. Is also good. Then, after injecting the liquid, it is sealed with a rivet.

On the other hand, although the purpose of the present invention is to prevent the vibration of the engine mounted on the automobile, the vibration isolator of the present invention may be used for other purposes such as a body mount of an automobile or other uses. Needless to say, the shape and dimensions of the elastic body and the like are not limited to those of the embodiment.

[0054]

As described above, since the vibration isolator of the present invention has the above-mentioned structure, it has an excellent effect that the cover material and the elastic body are securely joined even if the bracket is made of resin. .

[Brief description of drawings]

FIG. 1 is a cross-sectional view perpendicular to an axis showing a vibration damping device according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line 2-2 of FIG.

3 is a sectional view taken along the line 3-3 of FIG.

FIG. 4 is an exploded perspective view of an elastic body and a resin inflow prevention cover applied to the vibration isolator according to the first exemplary embodiment of the present invention.

FIG. 5 is an exploded perspective view of a reinforcing cylinder applied to the vibration isolator according to the first exemplary embodiment of the present invention.

FIG. 6 is a perspective view of a reinforcing cylinder applied to the vibration isolator according to the first exemplary embodiment of the present invention.

FIG. 7 is a cross-sectional view perpendicular to an axis showing an elastic body fitted with a resin inflow prevention cover applied to the vibration isolator according to the first exemplary embodiment of the present invention.

FIG. 8 is a cross-sectional view corresponding to FIG. 2 showing a modified example of the vibration isolator according to the first exemplary embodiment of the present invention.

FIG. 9 is a development view of a reinforcing cylinder applied to the vibration damping device according to the second embodiment of the present invention.

FIG. 10 is a perspective view of a reinforcing cylinder applied to the vibration damping device according to the second embodiment of the present invention.

[Explanation of symbols]

 10 Vibration Isolator 12 Bracket 14 Inner Tube Metal Fitting 16 Elastic Body 30 Resin Inflow Prevention Cover (Cover Material) 32 Reinforcing Cylinder (Reinforcing Member) 34 Main Liquid Chamber 38 Sub Liquid Chamber 52 Reinforcing Cylinder (Reinforcing Member)

Claims (1)

[Claims] 1. A bracket which is directly connected to one of the vibration generating part and the vibration receiving part and is integrally molded with resin, and a bracket which is connected to the other of the vibration generating part and the vibration receiving part and is arranged inside the bracket. An inner cylinder, an elastic body disposed between the bracket and the inner cylinder so as to connect between the bracket and the inner cylinder, and at least a part of an inner wall formed by the elastic body. And a reinforcing member disposed between the bracket and the inner cylinder in a state of being vulcanized and bonded to the elastic body, and interposed between the bracket and the elastic body. A vibration isolator, comprising: