JPH08135718A - Vibration control device - Google Patents

Abstract

PURPOSE: To manufacture a vibration control device having a bracket made of a resin easily. CONSTITUTION: A rubber elastic body 16 is arranged between an inner cylinder metal fitting 14 and a bracket. A cylindrical resin influx preventing cover 30 for covering the elastic body 16 along its outer circumference is fittingly- provided on the elastic body 16. A gate 54 for injecting a synthetic resin into a gap between the elastic body 16 and resin influx preventing cover 30 and a mold 52 is formed on a position which is the upper side of the mold 52 and the counter position against the axis direction central part of the resin influx preventing cover 30 when the bracket is molded. Therefore, high injection pressure P is not added to the elastic body 16. the elastic body is not pushed and wound, nor the resin leaks into the elastic body 16 side from the end part of 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 the elastic body is inserted into the outer cylinder.
In order to prevent the outer cylinder from coming off and to seal it, the end portion of the outer cylinder is drawn. Then, the outer cylinder after the inner cylinder is attached is press-fitted into the mounting bracket to be attached to the body of the automobile.

However, in recent years, demands for cost reduction and weight reduction by reducing the number of parts and assembling man-hours have become strong, and resin parts have been studied.

For this reason, a structure has been conceived in which a resin is injection-molded on the outer peripheral side of an elastic body having an inner cylindrical metal member and an outer cylinder integrated bracket is arranged around the elastic body. It was

[0006]

However, since such an anti-vibration device has a structure in which the outer periphery of the elastic body is covered with resin, when the elastic body is put into the mold to mold the resin, high injection of the resin is required. Due to the pressure, the elastic body may be pushed and rolled, or the resin may enter the elastic body side from the end portion of the elastic body.

Further, in order to eliminate such a problem, the molding conditions at the time of injection molding have to be adjusted, and the molding conditions are narrowed, which makes the manufacturing difficult.

SUMMARY OF THE INVENTION In consideration of the above facts, an object of the present invention is to easily provide an anti-vibration device having a resin bracket.

[0009]

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, At least a cover material that is disposed so as to be opposed to a resin injection port when molding the bracket and is disposed on a joint surface between the bracket and the elastic body.

According to a second aspect of the present invention, there is provided a vibration damping device, which is directly connected to one of the vibration generating part and the vibration receiving part and is integrally molded with resin, and is connected to the other of the vibration generating part and the vibration receiving part. At least a part of the inner wall of the inner cylinder arranged inside the bracket, the elastic body arranged between the bracket and the inner cylinder so as to connect the bracket and the inner cylinder, A pressure receiving liquid chamber formed of the elastic body and containing a liquid, and a sub liquid chamber provided at a position separated from the pressure receiving liquid chamber in the circumferential direction of the inner cylinder and containing a liquid, at least the bracket A cover material that is disposed so as to be opposed to a resin injection port when molding, and is disposed on a joint surface between the bracket and the elastic body, and an outer peripheral surface of the elastic body and an inner peripheral surface of the cover material. Groove shape provided between A restricted passage connecting between said between and the pressure receiving liquid chamber is formed by a gap auxiliary fluid chamber, characterized in that it comprises a.

[0011]

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, in manufacturing the vibration isolator according to the present invention, since the bracket is integrally formed of resin, it is necessary to reduce the weight of the vibration isolator and it is necessary to process the bracket and the outer cylinder by press working or the like. It is eliminated and the working process is simplified.

Further, in the manufacture of the vibration isolator, the outer peripheral surface of the elastic body is covered with the cover material and then the resin is molded to form the bracket. At this time, the cover material is at least the resin used when the bracket is molded. Since it is placed so as to face the inlet, a high resin injection pressure is applied to the cover material when the resin is injected, and the injection pressure causes the elastic body to be pushed and curled, or the end portion of the elastic body. The resin does not enter the elastic body side.

From the above, it is not necessary to adjust the molding conditions when molding the bracket, the workability of the vibration isolator is improved, and the manufacturing cost can be reduced.

The operation of the vibration isolator according to claim 2 will be described below. This claim can also achieve the same effect as that of claim 1. However, a pressure receiving liquid chamber in which a part of the inner wall is formed of an elastic body, and a sub liquid chamber at a position separated from the pressure receiving liquid chamber in the circumferential direction of the inner cylinder are provided, and liquid is sealed in these liquid chambers. . Then, as described above, the cover material is disposed so as to be interposed at the joint surface between the bracket and the elastic body in a state of facing at least the resin injection port when molding the bracket, and the outer peripheral surface of the elastic body and the cover material. The groove-shaped gap provided between the pressure-receiving liquid chamber and the sub-liquid chamber is formed by the groove-shaped gap provided between the pressure-receiving liquid chamber and the sub-liquid chamber.

Therefore, when the vibration is transmitted from the vibration generating portion side, the elastic body is deformed, the pressure receiving liquid chamber is expanded or contracted accordingly, and the pressure change occurs in the liquid in the restricting passage, so that only the elastic body is deformed. Not only that, the vibration is attenuated by the pressure change of the liquid, the viscous resistance, etc., and it becomes difficult to transmit the vibration to the vibration receiving portion side.

Further, in the manufacture of the vibration isolator, after covering the outer peripheral surface of the elastic body with resin, the resin is molded to form the bracket. At this time, the cover material adheres to the outer periphery of the elastic body. Since the resin material is prevented from entering the groove-shaped gap, it is possible to easily form the restriction passage between the bracket and the elastic body. Therefore, it becomes possible to form the restricted passage on the outer peripheral surface side of the elastic body, which allows the length and the cross-sectional area of the restricted passage to be freely set, and the vibration damping characteristics are improved, resulting in efficient vibration. Can be attenuated.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An anti-vibration device according to one embodiment of the present invention is shown in FIGS. 1 to 8, and this embodiment will be described based on these drawings.

As shown in FIG. 1, a vibration isolator 1 of this embodiment.
No. 0 is equipped with an outer cylinder integrated type bracket 12 integrally formed of synthetic resin, and has an arm 12A protruding to one side of the bracket 12 on the vehicle body (not shown) side of the automobile as a vibration receiving portion. This bracket 12 is screwed on by means of a fixed embedded nut 13. Therefore,
The bracket 12 will be connected to the vehicle body.

As shown in FIGS. 1 and 2, an inner cylindrical metal member 14 formed in a circular tube shape is arranged inside the bracket 12 so as to be parallel to the axis of the bracket 12, and When a bolt (not shown) is screwed into 14, the inner tubular member 14 and the engine (not shown) that serves as a vibration generating portion are connected.

An elastic body 16 made of rubber is disposed between the inner tubular metal piece 14 and the bracket 12.

As shown in FIGS. 3 and 4, the elastic body 16 is formed into a cylindrical shape by vulcanization adhesion to the outer peripheral surface of the inner tubular metal member 14 and is located at the axially intermediate portion below the inner tubular metal member 14. On the side
A recess 18 is formed. A through hole 20 having an arc-shaped cross section is formed on the opposite side of the recess 18 with the inner tubular metal member 14 interposed therebetween. The through hole 20 is formed in the vertical direction, which is the main vibration direction of the vibration isolator 10. The metal fitting 14 is easily displaced.

In the axially intermediate portion on the outer peripheral side of the elastic body 16,
A groove 22 extending along the circumferential direction is formed. One end of the groove 22 is connected to the recess 18, and the other end is connected to a small recess 24 formed at a position opposite to one end of the groove 22 with the inner tubular metal piece 14 interposed therebetween. The elastic body 16 between the small recess 24 and the through hole 20 is a diaphragm 26 as a thin elastic film.

Further, as shown in FIG. 4, a wide shallow groove 28 extending along the circumferential direction of the elastic body 16 is formed in the axially intermediate portion of the elastic body 16. In this shallow groove 28,
A resin inflow prevention cover 30 as a cylindrical cover material as shown in FIG. 5, which covers the recess 18, the groove 22 and the small recess 24 along the outer peripheral surface of the elastic body 16, is inserted from the axial direction of the elastic body 16. It has been fitted. The resin inflow prevention cover 30 is formed by cutting a metal round pipe into a predetermined length, and a split 31 along the axis is formed as shown in FIG. 1. Easy to insert. After the insertion, the resin inflow prevention cover 30 elastically returns to come into close contact with the elastic body 16, and is disposed so as to be interposed in the joint surface between the bracket 12 and the elastic body 16.

That is, since the resin inflow prevention cover 30 is arranged in this way, the outer peripheral surface of the resin inflow prevention cover 30 and the outer peripheral surface of the elastic body 16 in the portion not covered by the resin inflow prevention cover 30 are It will be bonded to the inner peripheral surface of the bracket 12.

On the other hand, in the shallow groove 28 on both axial side portions of the elastic body 16 with respect to the recess 18, the groove 22 and the small recess 24,
In order to improve the sealing performance between the resin inflow prevention cover 30 and the inner peripheral surface, small projections 32 are formed continuously in the circumferential direction as shown in FIGS. 3 and 4.

As shown in FIGS. 1 and 2, the recess 18 is closed by a resin inflow prevention cover 30 to form a main liquid chamber 34 as a pressure receiving liquid chamber, and the groove 22 which is a groove-like gap prevents the resin inflow. The cover 30 is closed to form an orifice 36 as a restriction passage, and the small recess 24 is closed to the resin inflow prevention cover 30 to form a sub liquid chamber 38.
Therefore, the orifice 36 communicates between the main liquid chamber 34 and the sub liquid chamber 38 provided at a position separated from the main liquid chamber 34 in the circumferential direction of the inner tubular member 14.

The main liquid chamber 34 and the orifice 36 are also provided.
A liquid 40 such as water or oil is enclosed in the sub liquid chamber 38. This liquid 40 is used in the bracket 1
2 and the injection port 4 penetrating the resin inflow prevention cover 30
It is designed to be injected from 2 and is sealed with a rivet 44 after the injection.

Next, the assembly of the vibration isolator 10 according to this embodiment will be described. At the time of assembling the vibration isolator 10, the elastic body 16 is vulcanized and adhered around the inner cylindrical metal member 14 to obtain the state shown in FIGS. 3 and 4.

Next, the resin inflow prevention cover 30 is inserted into the shallow groove 28 from the axial direction of the elastic body 16 to obtain the state shown in FIG. Since the elastic body 16 is elastically deformable, the resin inflow prevention cover 30 can be easily inserted.

Next, the elastic body 16 and the embedding nut 13 fitted with the resin inflow prevention cover 30 are attached as shown in FIGS.
Mold 5 which is a mold for forming a bracket as shown in FIG.
2 is loaded in a predetermined position, and molten synthetic resin is injected into the mold 52. As a result, the synthetic resin is elastic body 16
And is adhered to the outer peripheral portion of the resin inflow prevention cover 30,
The bracket 12 integrated with the elastic body 16 and the resin inflow prevention cover 30 is molded.

At this time, as shown in FIGS. 7 and 8, on the upper side of the mold 52, the resin inflow prevention cover 3 is provided.
A gate 54, which is a resin injection port for injecting the synthetic resin into the gap between the elastic body 16 and the resin inflow prevention cover 30 and the mold 52, is formed at a position opposed to the central portion in the axial direction of 0. ing.

Therefore, since a high resin injection pressure P is applied to the resin inflow prevention cover 30 at the time of resin injection, a high injection pressure P is not applied to the elastic body 16, and the injection pressure P causes The elastic body 16 is prevented from being pushed and rolled, and the resin does not enter the elastic body 16 side from the end portion of the elastic body 16.

Further, at this time, since the resin inflow prevention cover 30 is pressed against the injection pressure P and closely adheres to the outer periphery of the elastic body 16, the resin material is prevented from entering the concave portion 18, the groove 22 and the small concave portion 24. The main liquid chamber 34, the sub liquid chamber 38, and the orifice 36 can be easily formed between the bracket 12 and the elastic body 16.

After that, the bracket 12 is taken out of the mold 52, a predetermined liquid is injected into the inside through the injection port 42, and the rivet 44 seals it to complete the assembly of the vibration isolator 10.

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 vibration is transmitted from the engine side to the inner tubular member 14, the elastic body 16
Is deformed, and the deformation of the elastic body 16 damps the vibration. In addition, the main liquid chamber 34 expands and contracts as the elastic body 16 deforms, causing a pressure change in the liquid in the orifice 36, which causes vibration not only due to the deformation of the elastic body 16 but also due to the pressure change of the liquid and viscous resistance. The vibration is damped, and it becomes difficult for the vibration to be transmitted to the vehicle body side.

Further, in manufacturing the vibration isolator 10 according to this embodiment, 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. No need to process,
The processing steps are simplified.

Further, after the resin inflow prevention cover 30 is covered on the outer peripheral surface of the elastic body 16, resin is molded to form the bracket 12. At this time, when the resin inflow prevention cover 30 forms at least the bracket 12. Since it is arranged so as to face the gate 54, the resin injection prevention cover 30 receives a high resin injection pressure P at the time of resin injection, and the elastic body 16 is pushed and curled as described above. , The resin is elastic body 1 from the end of the elastic body 16.
No more entering the 6 side.

From the above, it is not necessary to adjust the molding conditions when molding the bracket 12, the workability of the vibration isolator 10 is improved, and the manufacturing cost can be reduced.

Further, as the bracket 12 is molded, the resin flow-in prevention cover 30 prevents the resin material from entering the groove 22, so that the orifice 36 can be easily formed. Therefore, it becomes possible to form the orifice 36 on the outer peripheral surface side of the elastic body 16, whereby the length and cross-sectional area of the orifice 36 can be freely set, the damping characteristic of vibration is improved, and the efficiency is improved. It is possible to damp the vibration.

On the other hand, in the vibration damping device 10 of the present embodiment, the diaphragm 26 is integrally formed as a part of the elastic body 16, and the main liquid chamber 34, the sub liquid chamber 38 and the orifice 36 flow into the elastic body 16 and the resin. Since it is formed between the anti-vibration cover 30 and the anti-vibration device, it does not require a partition member for separating the main liquid chamber and the sub liquid chamber, an orifice forming member, a diaphragm, etc., which are required in the conventional vibration isolator, as separate components, Since these parts are not assembled after molding, it is possible to further reduce the number of parts and the number of assembling steps.

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. In addition, although the description has been given using the vibration isolator such as a liquid-filled type, it may be applied to a vibration isolator that does not contain a liquid.

Further, although the inner cylinder is made of metal fittings in the above-mentioned embodiment, it may be made of resin, and ABS, polyacetal, etc. may be considered as the kind of resin material used in the above-mentioned embodiment. Is not limited to.

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 than the automobile. Needless to say, the shape and dimensions of the elastic body and the like are not limited to those of the embodiment.

[0047]

As described above, since the vibration isolator of the present invention has the above-mentioned structure, it has an excellent effect that the vibration isolator having the resin bracket can be easily manufactured.

[Brief description of drawings]

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

2 is a sectional view taken along line 2-2 of the vibration damping device shown in FIG.

FIG. 3 is a cross-sectional view perpendicular to an axis showing the elastic body before being incorporated into the outer cylinder.

FIG. 4 is a side view of the elastic body before being incorporated into the outer cylinder.

FIG. 5 is a side view of a resin inflow prevention cover.

FIG. 6 is a side view of an elastic body in which a resin inflow prevention cover is assembled.

FIG. 7 is a sectional view of a mold applied to one embodiment of the present invention.

8 is a sectional view taken along line 8-8 of the mold shown in FIG.

[Explanation of symbols]

 10 Vibration Isolator 12 Bracket 14 Inner Cylinder Metal Fitting (Inner Cylinder) 16 Elastic Body 30 Resin Inflow Prevention Cover (Cover Material) 34 Main Liquid Chamber (Pressure Received Liquid Chamber) 36 Orifice (Restricted Passage) 38 Sub Liquid Chamber

Claims (2)

[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 facing a resin injection port when molding the bracket. A cover member that is disposed in a state of being interposed in a joint surface between the bracket and the elastic body in a state. 2. 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 sub-liquid chamber which is provided at a position separated from the pressure-receiving liquid chamber in the circumferential direction of the inner cylinder and in which liquid is sealed, and at least a resin injection port for molding the bracket Provided between the bracket and the elastic body in a state of being opposed to the cover material, and a groove provided between the outer peripheral surface of the elastic body and the inner peripheral surface of the cover material. Formed by the gap And a restriction passage connecting the pressure receiving liquid chamber and the sub liquid chamber.