JPH0979311A - Vibration insulating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin bracket which can reduce the manufacturing cost and which can maintain the strength. SOLUTION: A spacing fixture 20 and an elastic member 18 are coupled together by vulcanized adhesion. A synthetic resin support cylinder 20 is arranged at the outer peripheral side of the spacing fixture 20. The outer peripheral surface of the spacing fixture 20 is fitted in the inner peripheral surface of the support cylinder 16 which defines a space part 24, and the elastic member 18 is located at an opening end of the space part 24. In this condition, the front end side of a calking part 20A of the spacing fixture 20 is bent over its entire periphery, so that the spacing fixture 20 is calked so as to be locked to a ring-like protrusion 16C. Further, a diaphragm 30 abuts against a step part 16E of the support cylinder 16 so as to define a liquid chamber 32 which is divided into two parts by a partition member 34.

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 for preventing transmission of vibration from a vibration generator, and is applied to mounts for supporting a member that generates vibration, such as automobiles, construction machines, and general industrial machines. It is possible.

[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.

[0003] That is, as this vibration isolator, there is known one in which an elastic body and a pair of liquid chambers are provided inside the vibration isolator, and these liquid chambers are communicated with each other through a restricted passage serving as an orifice. When the mounted engine operates and generates vibration, the vibration is absorbed by the vibration damping function of the elastic body and the viscous resistance of the liquid in the orifice communicating with these liquid chambers, and the vibration is transmitted. It is designed to block.

On the other hand, in recent years, there has been a strong demand for cost reduction and weight reduction by reducing the number of parts and the number of assembling steps, and the use of resin for the components of the vibration isolator has been studied. For this reason, a structure in which the mounting member arranged on the outer peripheral side of the elastic body and connected to the vehicle body side or the engine side is made of resin and the mounting member is replaced with a bracket made of resin has been newly considered.

[0005]

However, it is difficult to replace the conventional mounting member made of metal such as aluminum or iron with the shape of the conventional mounting member and replace it with a resin bracket. There was a new need to consider.

That is, conventionally, a vulcanization-bonded metal cylindrical metal fitting is arranged around an elastic body which is a main body rubber, and by caulking an attachment member to the connecting cylindrical metal fitting, the elastic body And the mounting member was fixed. However, in this case, in order to easily crimp the mounting member, the mounting member needs to have a complicated structure and the dimensional accuracy needs to be improved, and various processes are required. For example, if the mounting member has a complicated structure, welding or the like is required, and if the mounting member requires highly accurate dimensions, cutting or the like is required.
Even if the conventional structure and shape are directly applied to the resin bracket, the manufacturing cost will be increased.

Further, even if a bracket formed of a polyamide resin (nylon 6, 66, etc.), which is a typical example of a resin material, is adopted in a vibration isolator, the surface of the bracket is exposed to the liquid chamber. In this case, the bracket may absorb the ethylene glycol, which is the liquid in the liquid chamber, and the strength of the resin may decrease.

In consideration of the above facts, an object of the present invention is to provide a vibration isolator having a resin bracket capable of reducing the manufacturing cost and maintaining its strength.

[0009]

According to a first aspect of the present invention, there is provided a vibration isolator having a mounting member connected to one of a vibration generating portion and a vibration receiving portion, and a concave member connected to the other of the vibration generating portion and the vibration receiving portion. A resin bracket having a space, an elastically deformable elastic body connected to the mounting member, an elastic body bonded to the elastic body and locked to the bracket so that the open end of the space is the elastic body. And a liquid chamber that is disposed in the space and in which a liquid is sealed, and a liquid chamber configuration that is disposed in the space and separates the liquid in the liquid chamber from the bracket with the isolation metal. And a part.

A vibration isolator according to a second aspect is the vibration isolator according to the first aspect, wherein the isolation fitting is fitted in the space of the bracket and is crimped to the bracket to engage with the bracket. It is characterized by being stopped.

The operation of the vibration isolator according to claim 1 will be described below. A resin bracket having a concave space portion is connected to an elastically deformable elastic body connected to the mounting member via an isolating metal fitting that is retained by the bracket, and accordingly, a bracket is formed on the bracket. The elastic body closes the open end of the space. Further, the liquid enclosed in the liquid chamber is separated from the bracket by the liquid chamber constituent parts and the separating metal fitting arranged in the space.

Therefore, when vibration is transmitted to the vibration isolator thus formed from the side of the vibration generator connected to the mounting member or the bracket, the elastic body is deformed, and the liquid chamber is expanded or contracted accordingly. Causes pressure change and flow in the liquid,
The vibration is attenuated by the deformation of the elastic body, the pressure change of the liquid, and the flow, and it becomes difficult to transmit the vibration to the vibration receiving portion side.

Further, for example, when the partition member and the diaphragm as the liquid chamber constituent parts are arranged in the space, the separating fitting is locked by the bracket and the open end of the space is closed by the elastic body. The liquid chamber can be sealed while securely fixing the partition member and the diaphragm. Along with this, since the side of the isolation metal fitting corresponding to the cylindrical metal fitting is processed differently from the conventional technology and locked to the bracket, it is not necessary to make the bracket a complicated structure or to improve the dimensional accuracy, and the manufacturing cost can be reduced. .

Further, since the bracket and the liquid in the liquid chamber are separated by the separating metal fitting and the liquid chamber constituent parts, and the surface of the bracket is not exposed to the liquid chamber, the bracket absorbs the liquid in the liquid chamber and the strength of the resin. Does not decrease.

As described above, it is possible to reduce the manufacturing cost of the vibration isolator and reduce the weight of the vibration isolator by using the resin bracket separated from the liquid in the liquid chamber.

The operation of the vibration isolator according to claim 2 will be described below. The vibration isolator according to this claim also has the same operation as the vibration isolator of claim 1. However, since the separating metal fitting is fitted in the space of the bracket and is crimped to the bracket and locked to the bracket, the following operation is also achieved.

That is, since the separating metal fitting is fitted into the bracket and is crimped and locked, the elastic body is more firmly connected to the bracket and the liquid chamber sealing effect is improved.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a vibration isolator according to the present invention is shown in FIGS. 1 to 3, and this embodiment will be described based on these drawings.

As shown in FIG. 1 showing the present embodiment, the top plate 12 forming the upper side of the vibration isolator 10 is provided on the upper side of the top plate 12 of an engine (not shown) by screwing a nut (not shown). Bolts 14 for connecting and fixing by projection are projected. Then, the top plate 12 and the bolt 14
Constitutes the mounting member.

A cylindrical elastic member 18 made of rubber is vulcanized and adhered to the top plate 12, and a concave portion 18A is provided at the center of the lower part of the elastic member 18. Further, on the outer peripheral side of the elastic body 18, a separating metal member 20 formed of a thin steel plate in a cylindrical shape is arranged. The separating metal member 20 extending from the upper side of the separating metal member 20 to the middle of the vertical direction of the separating metal member 20. The outer peripheral surface of the elastic body 18 is vulcanized and adhered to the inner peripheral surface of the elastic body 18, and the elastic body 18 and the separator 20 are connected by vulcanization and adhesion.

Further, on the outer peripheral side of the isolation fitting 20, a support cylinder 16 which is a bracket made of a synthetic resin material and formed in a tubular shape is arranged.

The lower portion of the support cylinder 16 is composed of a flange portion 16A protruding outward, and a pair of collars 22 are embedded in the flange portion 16A.
Therefore, the support cylinder 16 is connected to the vehicle body side by screwing unillustrated bolts protruding from the vehicle body side to the collars 22, respectively. Further, a bottom portion 16D protruding downward one step is formed at the center side of the lower portion of the support cylinder 16, and a through hole 26 is provided at the center of the bottom portion 16D as required.

On the other hand, a cylindrical tubular portion 16B is erected at a right angle from the inner peripheral portion of the flange portion 16A.
On the upper part of 6B, a ring projecting portion 16C that projects in a ring shape on the outer peripheral side is continuously formed. A space portion 24, which is a concave space, is formed in the support cylinder 16.
The opening formed on the inner peripheral side of the ring protrusion 16C has the space 2
4 and open end. A flat step portion 16E is provided in a ring shape at a position near the bottom of the space portion 24, and the space portion 24 below the step portion 16E is thin.

Further, the elastic body 18 is installed at the open end of the space portion 24 by fitting the outer peripheral surface of the separator 20 into the inner peripheral surface of the support cylinder 16 forming the space portion 24. A caulking portion 20 </ b> A that is bent and protrudes toward the outer peripheral side is formed on the upper side of the separator 20. Further, with the elastic body 18 installed at the open end of the space 24, the caulking portion 20
By bending the front end side of A over the entire circumference and projecting the front end side of the caulking portion 20A in the inner peripheral direction, the separating metal fitting 20 is caulked and locked to the ring protrusion 16C of the support cylinder 16, and the supporting cylinder 16 The stopper 20 and the elastic body 18 are prevented from coming off. For this reason, the isolation fitting 20 is securely fixed to the support cylinder 16.

As described above, the elastic body 18 is attached to the support cylinder 16 so as to close the open end of the space 24 with the caulking portion 20A formed on the upper end side of the isolation fitting 20 being locked to the support cylinder 16. It is installed.

On the other hand, as shown in FIG. 1, the outer peripheral end of the rubber diaphragm 30 is brought into contact with the upper surface of the step portion 16E of the support cylinder 16, and the space portion 24 is formed by the diaphragm 30.
Partition. As a result, the liquid chamber 32 becomes the diaphragm 30.
It is formed on the upper side and arranged in the space 24, and liquids such as water and oil are sealed in the liquid chamber 32. Further, an air chamber 44 is formed between the diaphragm 30 and the bottom portion 16D to allow the diaphragm 30 to be deformed.

A partition member 34 made of, for example, a metal material is disposed inside the liquid chamber 32 so as to be fitted to the inner peripheral surface of the isolation fitting 20, and the liquid chamber 32 is connected to the main liquid chamber 32A.
And a sub liquid chamber 32B.

The lower end of the outer peripheral end 34A, which is the outer peripheral surface of the partition member 34, projects outward, and this portion is in contact with the inner peripheral surface of the support cylinder 16. Further, the partition member 34 and the diaphragm 30 are used for the lower end portion 2 of the isolation fitting 20.
It is fixed while being pressed integrally to the step portion 16E by 0B.

From the above, as shown in FIG.
0, the diaphragm 30, and the partition member 34 are the support cylinder 1
6 and the liquid in the liquid chamber 32 are separated from each other.

On the other hand, inside the outer peripheral end portion 34A of the partition member 34, a groove portion 36 formed in a groove shape is provided along the outer peripheral end portion 34A for almost one round. This groove 36
A small hole 38 communicating between the main liquid chamber 32A and the inside of the groove portion 36 is formed at one end portion, and a small hole 40 communicating between the sub liquid chamber 32B and the inside of the groove portion 36 is formed at the other end portion. I have. Therefore, the groove portion 36 closed by the inner peripheral surface of the isolation fitting 20.
And the small holes 38 and 40 constitute an orifice 42 that communicates between the main liquid chamber 32A and the sub liquid chamber 32B.

Next, the assembly of the vibration isolator 10 of this embodiment will be described. First, the top plate 12 and the isolation fitting 20 are put into a vulcanization mold (not shown) to vulcanize the elastic body 18, and the elastic body 18 is added to the top plate 12 and the isolation fitting 20 as shown in FIG. Sulfur bond. On the other hand, the collar 22 is loaded into a resin molding mold (not shown), and the molten resin material is injection-molded to form the support cylinder 16 in which the collar 22 is embedded, as shown in FIGS. 2 and 3. Insert molding.

Then, in the liquid, the diaphragm 30 which constitutes a part of the inner wall of the liquid chamber 32 is inserted from the open end of the space portion 24, and the partition member 34 which divides the liquid chamber 32 into two is formed in the space portion. Insert from the open end of 24. Finally, the isolation fitting 20 is fitted to the inner peripheral surface of the support cylinder 16,
By caulking the tip side of the caulking portion 20A so as to be bent inward as shown by a chain double-dashed line, the support cylinder 16 is connected to the elastic body 18, and the elastic body 18 closes the open end of the space portion 24. , As shown in FIG.

After that, the vibration isolator 10 thus assembled is installed in the vehicle. Next, the operation of the present embodiment will be described.

When the engine mounted on the top plate 12 operates, the vibration of the engine is transmitted to the elastic body 18 via the top plate 12. The elastic body 18 acts as a vibration absorbing body, and can absorb vibration by a vibration damping function based on internal friction caused by the deformation of the elastic body 18. Further, the main liquid chamber 32A expands and contracts due to the deformation of the elastic body 18, and the sub liquid chamber 32B
The diaphragm 30 on the side is deformed so that the liquids in the main liquid chamber 32A and the sub liquid chamber 32B flow through each other through the orifices 42, and the liquid pressure changes in the orifice space, damping due to viscous resistance of liquid flow, etc. The effect can improve the anti-vibration effect.

Further, a partition member 3 as a liquid chamber component
4 and the diaphragm 30 are arranged in the space 24, the metal fitting 20 is locked to the support cylinder 16 and the elastic body 18 closes the open end of the space 24. However, the liquid chamber 32 can be sealed while securely fixing the partition member 34, the diaphragm 30, and the like.

Along with this, the side of the separating metal fitting 20 corresponding to the cylindrical metal fitting is machined differently from the prior art to support the cylindrical cylinder 16.
The support cylinder 16 has a complicated structure,
It is not necessary to improve the dimensional accuracy, and the manufacturing cost can be reduced.

Further, the support cylinder 16 and the liquid in the liquid chamber 32 are separated from each other by the separating fitting 20, the partition member 34 and the diaphragm 30.
Are separated from each other and the surface of the supporting cylinder 16 is not exposed to the liquid chamber 32, so that the supporting cylinder 16 does not absorb the liquid in the liquid chamber 32 and the strength of the resin does not decrease. Along with this, since the partition member 34 and the diaphragm 30 are fixed by caulking with the isolation fitting 20, the liquid pressure in the liquid chamber 32 is not affected by absorption of the liquid in the liquid chamber 32. In contrast, the partition member 34 and the diaphragm 30 can be fixed in the liquid chamber 32 while maintaining sufficient strength for a long time. Further, since the support cylinder 16 has an integral structure, the air chamber 44 in the liquid chamber 32 is also molded at the same time, and the strength can be further increased.

When the vibration damping device 10 is assembled, the support cylinder 16 gets wet with liquid, but since it is temporary, the support cylinder 16 does not absorb moisture.

Further, according to the present embodiment, the isolation fitting 2
0 is fitted into the space portion 24 of the support cylinder 16 and is crimped over the entire circumference of the support cylinder 16 so that the support cylinder 16
Since the support cylinder 16 made of a resin material can maintain the compressive and tensile strengths, the elastic body 18 is more firmly connected to the support cylinder 16 and the liquid chamber sealing effect is improved. .

From the above, the support cylinder 16 made of a synthetic resin material separated from the liquid in the liquid chamber 32 is adopted, and the vibration isolator 1
It is possible to reduce the manufacturing cost of 0 and to reduce the weight of the vibration damping device 10.

The type of resin used for the support cylinder 16 is not limited to polyamide resin, but resin materials such as polyacetal, polycarbonate, and polyimide are conceivable, but are not limited to these materials.

Further, in the above embodiment, the support cylinder 16 is connected to the engine, which is the vibration generating portion, on the side of the top plate 12 which is the mounting member, and is a resin bracket on the body of a vehicle such as an automobile which is the vibration receiving portion. Although the configuration is such that the sides are connected, the configuration may be reversed.

On the other hand, in the embodiments, the purpose of the present invention is to prevent the vibration of the engine mounted on the vehicle. However, the anti-vibration device of the present invention is also used for the body mount of the vehicle, or for other purposes other than the vehicle. Needless to say,
The shape and dimensions are not limited to those in the embodiment.

[0044]

As described above, the vibration isolator of the present invention has the resin bracket which can reduce the manufacturing cost and maintain its strength.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view illustrating the assembly of an embodiment of the vibration damping device according to the present invention.

FIG. 3 is a view on arrow 3-3 in FIG.

[Explanation of symbols]

 10 Vibration Isolator 12 Top Plate 16 Support Cylinder 18 Elastic Body 20 Isolating Metal Fitting 24 Space Section 30 Diaphragm 32 Liquid Chamber 34 Partition Member

Claims (2)

[Claims] 1. A mounting member connected to one of the vibration generating portion and the vibration receiving portion; a resin bracket connected to the other of the vibration generating portion and the vibration receiving portion and having a concave space portion; An elastic body that is elastically deformable and is connected to the member; an isolating member that is adhered to the elastic body and is locked to the bracket to close the open end of the space portion with the elastic body; And a liquid chamber in which the liquid is sealed, and a liquid chamber constituent part that is disposed in the space and separates the liquid in the liquid chamber from the bracket by the isolating bracket. . 2. The vibration isolator according to claim 1, wherein the isolation fitting is fitted in the space of the bracket, and is crimped to the bracket to be locked to the bracket.