JP2020034096A - Vibration isolator and manufacturing method of vibration isolator - Google Patents

Abstract

To suppress a cost.SOLUTION: A vibration isolator comprises: a cylindrical outside attachment member 11 connected to either of a vibration generation part and a vibration receiving part; an inside attachment member 12 connected to the other, and arranged inside the outside attachment member; and a pair of main body rubber 13 for connecting the outside attachment member and the inside attachment member. Accommodation recesses 14 are formed at portions located between a pair of the main body rubber, and located at both sides of the outside attachment member with a center axial line O sandwiched in a radial direction between the outside attachment member and the inside attachment member, deformable accommodation bodies 21 in which liquid chambers are formed at the inside are fit into the accommodation recesses, the accommodation bodies are connected via an orifice pipe 22 for making the liquid chambers communicate with each other, and the accommodation bodies and the orifice pipe are integrally formed by a resin material.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vibration isolator and a method for manufacturing the vibration isolator.

Conventionally, a cylindrical outer mounting member connected to one of the vibration generating unit and the vibration receiving unit, and an inner mounting member connected to the other and disposed inside the outer mounting member, A pair of main body rubbers for connecting the mounting member and the inner mounting member, between the outer mounting member and the inner mounting member, between the pair of main body rubbers, and a center axis of the outer mounting member. 2. Description of the Related Art A vibration isolator is known in which accommodation recesses are provided in respective portions located on both sides sandwiched in the radial direction, and a deformable housing body in which a liquid chamber is formed is provided in each accommodation recess. .
As this type of vibration isolator, for example, an orifice case is attached to an inner mounting member as shown in Patent Literature 1 below, and an orifice passage is formed in the orifice case to communicate the liquid chambers of each container. Known configurations are known.

JP 2001-208125 A

  However, in the above-mentioned conventional vibration isolator, there is room for improvement in cost reduction.

  The present invention has been made in view of the circumstances described above, and has as its object to provide a vibration damping device capable of suppressing costs and a method of manufacturing the vibration damping device.

In order to solve the above problems, the present invention proposes the following means.
A vibration isolator according to the present invention is a tubular outer mounting member connected to one of a vibration generating unit and a vibration receiving unit, and is connected to the other and disposed inside the outer mounting member. An inner mounting member, and a pair of body rubbers for connecting the outer mounting member and the inner mounting member, between the outer mounting member and the inner mounting member, between the pair of body rubbers. , And a concave portion is provided in each of the portions located on both sides of the central axis of the outer mounting member in the radial direction, and a liquid chamber is formed in each of the concave portions in the deformable container. The body is fitted, and each of the containers is connected via an orifice tube communicating the respective liquid chambers, and each of the containers and the orifice tube is integrally formed of a resin material.

  Further, a method for manufacturing a vibration isolator according to the present invention is a method for manufacturing a vibration isolator for manufacturing the vibration isolator according to the present invention, wherein the main body includes the outer mounting member, the inner mounting member, and the main body rubber. The method includes a main body unit forming step of forming a unit, a liquid chamber unit forming step of forming a liquid chamber unit including the container and the orifice tube, and a fitting step of fitting the container into the housing recess.

According to these inventions, since each container is connected via the orifice tube communicating the respective liquid chambers, and each container and the orifice tube are integrally formed of a resin material, The increase in the number of parts and the number of manufacturing steps can be suppressed, and the cost can be reduced.
Further, by fitting the housing of the liquid chamber unit into the housing recess of the main unit, a vibration isolator having a liquid chamber can be obtained. Both of the vibration damping devices having the liquid chambers can be manufactured without changing, for example, a molding die, and the cost can be reliably reduced.

  Here, the container is formed in the shape of a hollow column extending in the radial direction, and a plurality of concave portions or convex portions extending continuously over the entire circumference along the center axis of the container are continuously formed in the radial direction. It may be formed in a bellows shape.

  In this case, since the container is formed in a bellows shape, it becomes possible to smoothly deform the container in the radial direction with the input of vibration, and the container is formed separately from the main body rubber. Deterioration of the damping performance can be prevented.

  In addition, at least one of the outer mounting member and the inner mounting member may be provided with a stopper capable of abutting against the outer peripheral surface of the container.

  In this case, since the stopper that can be abutted against the outer peripheral surface of the container is provided, when the container is deformed in the radial direction while expanding its diameter with the input of vibration, The outer peripheral surface of the container comes into contact with the stopper. Therefore, it is possible to prevent the container from being excessively deformed when vibration is input, and it is possible to prevent a decrease in durability.

  Further, the orifice tube may protrude from the housing toward one side in the axial direction, and the stopper may be disposed on the other side in the axial direction with respect to the housing.

  In this case, the orifice tube protrudes from the container toward one side in the axial direction, and the stopper is disposed on the other side in the axial direction with respect to the container. It is possible to prevent the container and the stopper from being crushed.

  In addition, the liquid chamber unit includes an injection cylinder portion that communicates with the liquid chamber and the orifice tube, and into which liquid is injected, and injects a liquid into the liquid chamber and the orifice tube through the injection cylinder portion. And a sealing step of crushing and welding the injection cylinder portion to seal the inside of the liquid chamber unit after the injection step.

  In this case, during the sealing step, the injection cylinder is crushed and welded to seal the inside of the liquid chamber unit, so that another member such as a rivet is not required, and the cost can be reliably reduced.

  According to the present invention, cost can be reduced.

It is a top view of the vibration isolator concerning one embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line II-II of the vibration isolator illustrated in FIG. 1. FIG. 3 is an explanatory diagram illustrating a method of manufacturing the vibration isolator illustrated in FIGS. 1 and 2.

Hereinafter, an anti-vibration device according to an embodiment of the present invention will be described with reference to FIGS.
The vibration isolator 1 includes a main unit 10 and a liquid chamber unit 20.

The main body unit 10 includes a cylindrical outer mounting member 11 connected to one of the vibration generating unit and the vibration receiving unit, and an inner mounting unit connected to the other and disposed inside the outer mounting member 11. It includes a member 12 and a pair of main rubbers 13 connecting the outer mounting member 11 and the inner mounting member 12.
In the illustrated example, the inner mounting member 12 is formed in a tubular shape, and the outer mounting member 11 and the inner mounting member 12 are arranged coaxially with a common axis. Hereinafter, this common axis is referred to as a central axis O, a direction along the central axis O is referred to as an axial direction, and a direction intersecting with the central axis O is referred to as a radial direction in a plan view viewed from the axial direction. The direction of circling is referred to as the circumferential direction.

The outer attachment member 11 and the inner attachment member 12 are formed in a cylindrical shape by, for example, a metal material. The inner mounting member 12 is inserted inside the outer mounting member 11. Both ends in the axial direction of the inner mounting member 12 protrude outward in the axial direction from both axial openings of the outer mounting member 11. The central portions of the outer mounting member 11 and the inner mounting member 12 in the axial direction match each other.
The outer mounting member 11 is connected to the vibration generator, and the inner mounting member 12 is connected to the vibration receiver. Note that the inner mounting member 12 may be connected to the vibration generating unit, and the outer mounting member 11 may be connected to the vibration receiving unit.

  The pair of body rubbers 13 extend in the radial direction and connect the inner peripheral surface of the outer mounting member 11 and the outer peripheral surface of the inner mounting member 12. The pair of body rubbers 13 are disposed on both sides of the inner mounting member 12 in the radial direction, and extend straight in the radial direction in plan view when viewed from the axial direction. The width of the main rubber 13 is larger than the outer diameter of the inner mounting member 12, and the pair of main rubbers 13 covers the entire outer peripheral surface of the inner mounting member 12. Of the surface of the main rubber 13, a side surface facing the inner peripheral surface of the outer mounting member 11 is flat over the entire area. The main body rubber 13 is disposed at least in the axial central portion of each of the inner peripheral surface of the outer mounting member 11 and the outer peripheral surface of the inner mounting member 12.

On the inner peripheral surface of the outer mounting member 11, a support rubber 16 is disposed at a circumferentially central portion of a portion radially opposed to the side surface of the main rubber 13. Of the surface of the support rubber 16, the side surface facing the side surface of the main rubber 13 is flat over the entire area. The support rubber 16 is disposed at least in the axial center of the inner peripheral surface of the outer mounting member 11. The volume of the support rubber 16 is smaller than the volume of the main rubber 13.
Note that the support rubber 16 need not be provided.

  Here, between the outer mounting member 11 and the inner mounting member 12, between the pair of main body rubbers 13, and at respective portions positioned on both sides of the center axis O in the radial direction, the housing recesses 14 are provided. It is arranged. In the illustrated example, the housing recess 14 is defined by the side surfaces of the main rubber 13 and the support rubber 16 and the inner peripheral surface of the outer mounting member 11. The housing recess 14 opens in both axial directions. The accommodation recess 14 has a rectangular shape that is long in the direction in which the main rubber 13 extends in plan view as viewed from the axial direction. The width of the housing recess 14 is smaller than the width of the main rubber 13.

  The liquid chamber unit 20 includes a deformable housing 21 fitted in each housing recess 14 and an orifice tube 22 connecting the housings 21 to each other. Each container 21 and orifice tube 22 are integrally formed of a resin material.

A liquid chamber 21 a is formed inside the container 21. The container 21 is formed in a hollow columnar shape extending in the radial direction. The container 21 is formed in a bellows shape in which a plurality of recesses or protrusions extending continuously over the entire circumference around the central axis O1 of the container 21 are radially connected. Both end surfaces in the radial direction of the housing 21 are formed flat, and uniformly contact the side surfaces of the main rubber 13 and the support rubber 16 over the entire area. Each container 21 is disposed coaxially. In the illustrated example, the housing 21 is fitted into the housing recess 14 in a state of being compressed and deformed in the radial direction.
The center axis O1 of the housing 21 is the center axis O of the outer mounting member 11 and the inner mounting member 12, the center of the support rubber 16 in the circumferential direction, the center of the housing recess 14 in the circumferential direction, and the outer mounting member 11 The inner mounting member 12 passes through the central portion in the axial direction.

  The orifice pipe 22 connects the containers 21 to each other and connects the respective liquid chambers 21a to each other. The orifice tube 22 protrudes from the housing 21 toward one side in the axial direction. The orifice pipe 22 straddles one of the pair of main rubbers 13 in the circumferential direction on one side in the axial direction. The orifice tube 22 is located between the outer mounting member 11 and the inner mounting member 12 in a plan view as viewed from the axial direction, and extends in the circumferential direction about the central axis O.

Here, at least one of the outer mounting member 11 and the inner mounting member 12 is provided with a stopper 15 that can abut against the outer peripheral surface of the housing 21. In the illustrated example, the stopper 15 is provided at a portion of the inner mounting member 12 that is located on the other axial side of the housing 21. The stopper 15 is formed integrally with the inner mounting member 12. The stopper 15 is formed in an annular shape extending continuously over the entire circumference. The outer peripheral surface of the stopper 15 is radially opposed to the side surface of the support rubber 16, and a radial gap is provided between the outer peripheral surface of the stopper 15 and the side surface of the support rubber 16. A portion of the surface of the stopper 15 that faces the outer peripheral surface and the outer peripheral surface of the housing 21 in the axial direction is covered with the rubber film 17. The rubber film 17 is formed integrally with the main rubber 13. A gap is provided between the rubber film 17, the side surface of the support rubber 16, and the outer peripheral surface of the housing 21.
Note that the rubber film 17 need not be provided.

  In the above configuration, when vibration is input to the vibration isolator 1, each body 21 expands and contracts in the radial direction while the main rubber 13 elastically deforms, and the inner volume of each liquid chamber 21 a fluctuates. Then, the liquid in the liquid chamber 21a flows through the orifice tube 22 to cause liquid column resonance, and the vibration is attenuated and absorbed.

  Next, a method of manufacturing the vibration isolator 1 configured as described above will be described.

First, in a state in which the outer mounting member 11 and the inner mounting member 12 are disposed in a molding die (not shown), a gap between the inner peripheral surface of the outer mounting member 11 and the outer peripheral surface of the inner mounting member 12 is set. The main unit 10 is formed by injecting the vulcanized rubber and vulcanizing the main rubber 13, the support rubber 16, and the rubber film 17 (main unit forming step).
Further, the liquid chamber unit 20 including the container 21 and the orifice pipe 22 is formed by blow molding (liquid chamber unit forming step).

Here, the liquid chamber unit 20 includes an injection cylinder portion 23 that communicates with the liquid chamber 21a and the orifice pipe 22 and into which the liquid is injected. The injection cylinder 23 is formed at the center of the orifice tube 22 in the longitudinal direction. The injection cylinder 23 projects radially outward from the orifice pipe 22. The inside of the injection cylinder 23 communicates with the liquid chamber 21a through the inside of the orifice tube 22.
Then, the liquid is injected into the liquid chamber unit 20, that is, the liquid chamber 21 a and the orifice pipe 22 through the injection cylinder 23 (injection step). In the present embodiment, first, in a state where the inside of the liquid chamber unit 20 is evacuated, as shown in FIG. 3, the injection cylinder 23 is inserted into the distal end of the nozzle 31 communicating with the tank in which the liquid is stored. Thus, the liquid in the tank is injected into the liquid chamber unit 20 through the injection cylinder 23. An O-ring 32 is provided at the tip of the nozzle 31 so as to be detachably fitted to the injection cylinder 23.

Next, the injection cylinder 23 is crushed and welded in the radial direction to seal the interior of the liquid chamber unit 20 (sealing step). At this time, the injection cylinder 23 is inserted into the tip of the nozzle 31. Next, a part of the injection cylinder part 23 located at the tip from the welded part is cut off.
Thereafter, the housing 21 of the liquid chamber unit 20 is fitted into the housing recess 14 of the main unit 10 (fitting step).
Note that the injection step and the sealing step may be performed after the fitting step.

As described above, according to the vibration damping device 1 according to the present embodiment, the respective containers 21 are connected via the orifice pipes 22 communicating the respective liquid chambers 21a, and the respective containers 21 and Since the orifice tube 22 is integrally formed of a resin material, increase in the number of parts and the number of manufacturing steps can be suppressed, and the cost can be reduced.
In addition, since the vibration isolator 1 having the liquid chamber 21a is obtained by fitting the container 21 of the liquid chamber unit 20 into the housing recess 14 of the main unit 10, the main unit does not have the liquid chamber 21a. It is possible to manufacture both the vibration isolator made of 10 and the vibration isolator 1 having the liquid chamber 21a, for example, without changing the molding die, and the cost can be reliably reduced.

  Further, since the housing 21 is formed in a bellows shape, it becomes possible to smoothly deform the housing 21 in the radial direction with the input of vibration, and the housing 21 is formed separately from the main rubber 13. It is possible to prevent the deterioration of the damping performance due to this.

  Further, since the stopper 15 which can be brought into contact with the outer peripheral surface of the container 21 is provided so as to be able to come into contact therewith, when the container 21 is contracted and deformed in the radial direction while expanding its diameter in response to vibration input. Then, the outer peripheral surface of the container 21 comes into contact with the stopper 15. Therefore, when vibration is input, it is possible to restrict the container 21 from being excessively deformed, and it is possible to prevent a decrease in durability.

Further, the orifice tube 22 protrudes from the container 21 toward one side in the axial direction, and the stopper 15 is disposed on the other side in the axial direction with respect to the container 21. The tube 22 can be prevented from being crushed between the container 21 and the stopper 15.
Further, at the time of the sealing step, the injection cylinder 23 is crushed and welded to seal the inside of the liquid chamber unit 20, so that another member such as a rivet is not required, and the cost can be reliably reduced.

  The technical scope of the present invention is not limited to the above-described embodiment, and various changes can be made without departing from the spirit of the present invention.

For example, in the above-described embodiment, a configuration in which the pair of main rubbers 13 covers the outer peripheral surface of the inner mounting member 12 over the entire circumference is shown, but the width of the main rubber 13 is smaller than the outer diameter of the inner mounting member 12, A part of the outer peripheral surface of the inner mounting member 12 may be a part of the inner surface of the housing recess 14.
Further, the inner mounting member 12 is not limited to a cylindrical shape, and may be appropriately changed, for example, by being formed solid.
Further, the direction in which the stopper 15 faces the container 21 is not limited to the above embodiment, and may be changed as appropriate. Further, the stopper 15 may be formed on the outer mounting member 11 or may be formed on both the outer mounting member 11 and the inner mounting member 12. Further, the stopper 15 may not be provided in the vibration isolator 1.
In addition, although the configuration in which the accommodating body 21 is formed in a bellows shape is shown, the accommodating body 21 may be appropriately changed, for example, by adopting a flat bag body as a whole.
Further, although the configuration in which the housing recess 14 is opened in both axial directions is shown, a configuration in which the other side in the axial direction is closed may be employed.

Further, the liquid chamber unit 20 may not have the injection cylinder 23. Further, the injection cylinder 23 may be formed in the container 21. In addition, the liquid chamber unit 20 is not limited to blow molding, and may be formed by another manufacturing method such as injection molding.
The method of injecting the liquid into the liquid chamber unit 20 is not limited to the above-described embodiment, and may be changed as appropriate, for example, by immersing the liquid chamber unit 20 in a pool in which the liquid is stored. .

  Further, the vibration isolator 1 may be applied to a torsion beam type rear suspension, an engine mount of a vehicle, a mount of a generator mounted on a construction machine, and a mount of a machine installed in a factory or the like.

  In addition, it is possible to appropriately replace the components in the above-described embodiment with well-known components without departing from the spirit of the present invention, and the above-described modifications may be appropriately combined.

DESCRIPTION OF SYMBOLS 1 Vibration isolator 10 Main unit 11 Outer mounting member 12 Inner mounting member 13 Main rubber 14 Housing recess 15 Stopper 20 Liquid chamber unit 21 Container 21a Liquid chamber 22 Orifice tube 23 Injection cylinder O Central axis O1 of outer mounting member Center axis of

Claims (6)

A cylindrical outer mounting member connected to one of the vibration generating unit and the vibration receiving unit, and an inner mounting member connected to the other and disposed inside the outer mounting member;
A pair of body rubber connecting the outer mounting member and the inner mounting member,
Between the outer mounting member and the inner mounting member, between each pair of the main body rubber, and at each portion located on both sides radially sandwiching the center axis of the outer mounting member, a housing recess. Arranged,
A deformable container having a liquid chamber formed therein is fitted into each of the concave portions,
Each of the containers is connected via an orifice tube communicating the respective liquid chambers,
The vibration isolator, wherein each of the housings and the orifice tube are integrally formed of a resin material.   The container is formed in a hollow columnar shape extending in the radial direction, and is formed in a bellows shape in which a plurality of concave or convex portions extending continuously over the entire circumference along the center axis of the container are connected in the radial direction. The anti-vibration device according to claim 1, wherein the anti-vibration device is formed.   The anti-vibration device according to claim 1, wherein at least one of the outer mounting member and the inner mounting member is provided with a stopper that can abut against an outer peripheral surface of the housing body. . The orifice tube projects from the housing toward one side in the axial direction,
The vibration isolator according to claim 3, wherein the stopper is provided on the other side in the axial direction with respect to the housing. It is a manufacturing method of the vibration isolator which manufactures the vibration isolator according to any one of claims 1 to 4,
A main unit forming step of forming a main unit including the outer mounting member, the inner mounting member, and the main rubber;
A liquid chamber unit forming step of forming a liquid chamber unit including the container and the orifice tube;
And a fitting step of fitting the housing body into the housing recess. The liquid chamber unit communicates with the inside of the liquid chamber and the orifice pipe, and includes an injection cylinder into which liquid is injected.
An injection step of injecting a liquid through the injection cylinder into the liquid chamber and the orifice pipe;
The method of manufacturing a vibration isolator according to claim 5, further comprising: a sealing step of crushing and welding the injection cylinder to seal the inside of the liquid chamber unit after the injection step.

Images