JPH0942365A - Viscous fluid filling type damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To absorb axial direction vibration effectively by arranging a nearly cylindrical damper main body having elasticity and for housing a viscous fluid inside, in the viscosity fluid filling damper for absorbing vibration in an acoustic apparatus, and closing the opening part of the damper main body by a cap body provided with an elastic orifice. SOLUTION: When an apparatus main body such as a CD is vibrated and vibration is acted on an agitating shaft 24, a viscous fluid 26 in a damper main body 12 is agitated by a projection part 20 integratedly with the agitating shaft 24. Vibration is damped by viscous resistance of the viscous fluid 16 at the time of agitation. At this time, the bottom part 14B of a recessed part 14A arranged on a cap body 14 is elastically deformed, air in the recessed part 14A flows out outward through an orifice 28, and vibration is absorbed by air resistance at the time of flow-out. Namely, vibration is also absorbed by air resistance when air is passed the orifice 28 in addition to vibration absorption by viscous resistance by the viscosity fluid 16, and vibration of an axial direction and axial vertical direction are absorbed effectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a viscous fluid-sealed damper for absorbing vibration in audio equipment and the like, and more particularly to a viscous fluid-sealed damper capable of effectively absorbing axial vibration.

[0002]

2. Description of the Related Art In precision equipment or audio equipment,
Vibration from the outside often adversely affects the performance of the device body, and therefore, a damper is incorporated inside the device in order to absorb the vibration.

In particular, when an audio device such as a CD player is mounted on a vehicle such as an automobile that is subject to severe vibrations, in order to efficiently absorb the vibration received by the automobile and prevent the vibration from being transmitted to the audio device. It is essential to take anti-vibration measures.

As the structure of the damper used for such a purpose, various types are known, but conventionally, a damper body in which a viscous substance such as silicone oil or gel is sealed is preferably used. Has been done. This type of damper includes, for example, as shown in FIG. 14, a damper main body 50, a viscous fluid 52 injected into the damper main body 50, and a lid 54 that closes the opening 50A of the damper main body 50. There is. Further, the damper is provided with a flat plate-shaped outer wall 56 and a press-contact member 58 for sandwiching the damper main body 50 and the lid 54 in a press-contact state by the outer wall 56.

Further, the damper main body 52 is formed with a projecting portion 60 which projects toward the opening side.
Stirrer shaft 6 protruding from the main body of equipment such as CD inside 0
2 is to be inserted. And the stirring shaft 62
The vibration is damped by the viscous resistance of the viscous fluid when the projecting portion 60 agitates the viscous fluid.

[0006]

However, in the above viscous fluid-sealed damper, the protrusion 6 is used to absorb vibration.
Although the area of the peripheral surface of 0 can be secured in a sufficient size, the area of the end surface 60A cannot be secured sufficiently. Therefore, the conventional viscous fluid-sealed damper can sufficiently absorb the vibration in the direction perpendicular to the axis (direction orthogonal to the axial direction of the damper body 50), but cannot sufficiently absorb the vibration in the axial direction of the damper body. There wasn't.

[0007]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a viscous fluid-sealed damper capable of effectively absorbing vibration in the axial direction.

[0008]

The present invention has been proposed in order to achieve the above object, and is characterized by the following points.

That is, according to the present invention, a substantially cylindrical damper main body having an opening at one end and a bottom at the other end and containing a viscous fluid therein, and the opening of the damper main body. An elastic lid having a recess formed on the side opposite to the damper body, a closing member for closing the recess of the lid, and the recess and the recess formed in the lid. And a orifice communicating with the outside of the viscous fluid.

Further, according to the present invention, there is provided a viscous fluid-sealed damper having an orifice formed along the periphery of the lid.

Further, according to the present invention, there is provided a viscous fluid-sealed damper having an orifice formed in the closing member.

Further, according to the present invention, claims 1 to 3
A viscous fluid-sealed damper according to any one of paragraphs 1,
Provided is a viscous fluid-sealed damper in which a pressure contact member for sandwiching the lid body and the damper body in a pressure contact state with a closing member is provided, and a seal member is integrally formed at a portion of the lid body that abuts the closing member. To be done.

Further, according to the present invention, claims 1 to 4
A viscous fluid-sealed damper according to any one of paragraphs 1,
A viscous fluid-sealed damper is provided in which a seal member is integrally formed at a portion of at least one of the lid body and the damper body that comes into contact with the pressure contact member.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION In a viscous fluid-sealed damper according to a first aspect of the present invention, an elastic lid body is provided which closes the opening of the damper body and has a recess formed on the side opposite to the damper body. . Then, the recess of the lid is closed by the closing member, and the recess and the outside of the recess are communicated with each other by the orifice formed in the lid.

According to the first aspect of the invention, the vibration is absorbed by the flow resistance of the viscous fluid. Further, in the invention of claim 1, in addition to the vibration absorption, air resistance when the air in the recess flows out to the outside through the orifice, and when air from the outside flows into the recess through the orifice, Vibration is absorbed by the air resistance of the. Therefore, not only the absorption of vibration in the direction perpendicular to the axis (direction orthogonal to the axis of the damper body) but also the absorption of vibration in the axis direction (direction parallel to the axis of the damper body) is sufficiently performed.

A second aspect of the present invention is the viscous fluid-sealed damper according to the first aspect, wherein the orifice is formed along the periphery of the lid. Therefore, the length of the orifice is sufficiently secured, and a sufficient vibration absorbing function is exhibited.

According to the invention of claim 3, an orifice is formed in the closing member, and the orifice exhibits a function similar to that of the orifice of claim 1 to absorb vibration.

According to a fourth aspect of the present invention, the viscous fluid-sealed damper according to any one of the first to third aspects, wherein a pressure contact member for sandwiching the lid body and the damper body in a pressure contact state with the closing member is provided. Has been. Then, a seal member is integrally formed at a portion of the lid body that abuts the closing member. That is, according to the present invention, since the lid and the closing member are in close contact with each other with a high adhesive force, it is possible to prevent the air in the recess from leaking between the lid and the closing member, and allow the air to smoothly pass through the orifice. Like

According to a fifth aspect of the present invention, in any one of the first to fourth aspects of the present invention, a seal member is integrally formed at a portion of the lid body and the damper body that abuts at least one pressure contact member. ing. Therefore, the lid and the damper body are held in close contact with each other, and the air can smoothly pass through the orifice.

The present invention will be specifically described below with reference to FIGS. 1 and 2. As shown in FIG. 1, the viscous fluid-sealed damper 10 is formed in a substantially cylindrical shape having an opening 12A at one end on the left side in FIG. 1 and a bottom portion 18 at the other end on the right side in FIG. The damper main body 12 is provided. The bottom portion 18 of the damper body 12 has an opening 12A at the center thereof.
It projects toward the side, and the inside of this projecting portion 20 serves as a stirring shaft insertion portion 22. Then, a stirring shaft 24 projecting from a device body such as a CD is inserted into the stirring shaft insertion portion 22. An annular flange 26 is formed at the end of the damper body 12 on the side of the opening 12A so as to be continuous with the opening 12A. The lid 14 having elasticity is adhered to the annular flange 26 via an adhesive, whereby the viscous fluid 16 is enclosed in the damper body 12.

As shown in FIG. 2, a circular recess 14 is formed in the center of the surface of the lid 14 opposite to the damper body 12.
A is formed, and an orifice 28 is formed from the outer peripheral surface of the lid 14 to the recess 14A. An outer wall 30 is fixed to the lid 14 so as to close the recess 14A, and the orifice 2 is provided inside the recess 14A.
It is communicated with the outside only through 8.

Further, the viscous fluid-sealed damper 10 is provided with a pressure contact member 32, and the pressure contact member 32 has an outer wall 30.
A base portion 32A that is in close contact with, a peripheral wall 32B that extends from the base portion 32A to the right in FIG. 1 and is in close contact with the flange 26 of the damper body 12, and an extending end of the peripheral wall 32B that is formed by bending inward. 1 The claw portion 32C that is in close contact with the right end surface is provided. Although not shown, the outer wall 30 and the pressure contact member 32 are fixed to each other by means such as screwing, so that the damper body 12 and the lid 14 are pressed against each other.

In the viscous fluid-sealed damper 10 configured as described above, when the device body such as a CD vibrates and the vibration acts on the stirring shaft 24, it is integrated with the stirring shaft 24 and the protrusion 2 is formed.
0 will stir the viscous fluid. The vibration is damped by viscous resistance of the viscous fluid 16 at the time of stirring. Further, the bottom portion 14B of the recess 14A is also elastically deformed as the viscous fluid 16 is stirred by the stirring shaft 24, which causes air resistance when the air in the recess 14A flows out to the outside through the orifice 28, and the outside. The vibration is absorbed by the air resistance when the air from the inside flows into the recess 14A through the orifice 28.

That is, in this example, in addition to the vibration absorption by the viscous resistance of the viscous fluid 16, the vibration is also absorbed by the air resistance when the air passes through the orifice 28, so that the vibration in the axial direction and the direction perpendicular to the axis are absorbed. Vibrations for both are effectively absorbed. In the above-described specific example, the cross-sectional area of the orifice 28 varies depending on the size of the recess 14A and the like, but when the diameter of the recess 14A is φ20, 0.1 mm ² to 1 mm ² is set to increase vibration absorption. preferable. 3 and 4 show another embodiment of the present invention. Note that, in these figures, the same members as those in FIG. 1 are designated by the same reference numerals as those in FIG. 1 and their description is omitted. In this specific example, as shown in FIG. 3 and FIG.
Are formed along the circumferential direction of the lid body 14, that is, so as to surround the periphery of the recess 14A. That is, one end 34A of the orifice 34 is in communication with the inside of the recess 14A, and the other end 34B is in communication with the outside.

In this example, the length of the orifice is sufficient.
As it is secured, the air as it passes through the orifice
Resistance can be increased and vibration absorption function is more effective
To be demonstrated. In the example of FIG. 3, the orifice 34
Depends on the size of the recess 14A and the like, but the recess 1
When the diameter of 4A is φ20, the cross-sectional area is 0.1mm² No
2 mm ² , The length of 50 to 90mm is vibration
It is preferable in terms of enhancing absorption.

In the above specific example, the orifice is formed on the lid 14 side, but the orifice 36 may be formed on the outer wall 30 as shown in FIGS. In this case, in the outer wall 30, the position where the orifice 36 is formed may be any position as long as it makes the outside communicate with the recess 14A, but as shown in FIG. 6, it faces the center of the recess 14A. It is preferable to form it at the position where it is provided in terms of vibration absorption performance. 5 and 6, the same members as those in the specific example of FIG. 1 are designated by the same reference numerals and the description thereof is omitted.

Further, in another specific example shown in FIG. 7, a seal member 38 is integrally formed on the outer peripheral surface of the lid body 14 along the entire surface thereof. This seal member 38 is used for the lid 14
Of the pressure contact member 32, and is elastically brought into close contact with the inner surface of the peripheral wall 32B of the press contact member 32 (see FIG. 1). Therefore, the lid 14 is held in a stable state by the pressure contact member 32, and the air in the recess 14A is prevented from leaking from the boundary portion between the lid 14 and the damper main body 12,
Air can smoothly pass through the orifice.

The position where the seal member 38 is formed is shown in FIG.
The position is not limited to the above position, and may be formed on the outer surface of the flange 26 of the damper body 12, as shown in FIG.
As shown in FIG. 9, it may be formed on the surface of the flange 26 opposite to the lid 14. Further, as shown in FIG.
4 may be formed on the side opposite to the damper body 12. FIG.
10 to 10, the close contact between the damper main body 12 and the lid 14 is ensured and air leakage from the recess 14A is prevented.

11 and 12 show another embodiment of the present invention. In the figure, the same members as those of the specific example of FIG.
In this specific example, as shown in FIG. 11, a seal member 40 is formed whose diameter gradually decreases from the peripheral edge of the recess 14A to the left in FIG. 11, that is, toward the outer wall 30 side. The seal member 40 is formed over the entire circumferential direction of the recess 14A. FIG. 1 with the viscous fluid-filled damper 10 assembled
In the state of 2, the seal member 40 is elastically deformed inward to be in close contact with the outer wall 30, and air is prevented from leaking between the lid 14 and the outer wall 30.

In each of the above specific examples, the material for molding the damper body 12 is natural rubber, SBR, II.
R, EPDM, BR, CR, etc. can be exemplified, and in particular IIR
Is preferable from the viewpoint of anti-vibration property. Further, in each of the above specific examples, examples of the material for molding the lid include natural rubber, SBR, IIR, EPDM, BR, CR, etc. In particular, using IIR is preferable from the viewpoint of vibration damping. .

[0031]

EXAMPLES The present invention will be described below with reference to examples. Example 1 Vibration absorption characteristics in the axial direction (left and right direction of FIG. 1) were measured using the viscous fluid-sealed damper having the configuration shown in the specific example of FIG. 1, and the measurement result is shown by a dashed line in FIG. In addition,
In FIG. 13, the vertical axis represents the transmissibility and the horizontal axis represents the frequency. In the viscous fluid-sealed damper, the cross-sectional area of the orifice was 0.4 mm ^2, and the outer diameter of the damper body 12 was φ34. The diameter of the recess 14A was set to φ20, and the height of the recess 14A (the distance from the bottom of the recess 14A to the opening end face of the recess 14A) was set to 2 mm. IIR was used as the material for the damper body 12 and the lid 14.

Example 2 Except that the cross-sectional area of the orifice is 1.2 mm ² ,
The vibration absorption characteristics were measured using the same viscous fluid-sealed damper as in Example 1, and the measurement result is shown by the chain double-dashed line in FIG.

Comparative Example 1 Vibration absorbing characteristics were measured using the same viscous fluid-sealed damper as in Example 1 except that the lid was not provided with a recess and an orifice, and the measurement results are shown by the solid line in FIG.

[0034]

As described above, according to the present invention, it is possible to provide the viscous fluid-sealed damper which can effectively absorb the vibration in the axial direction.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a specific example of a viscous fluid-sealed damper according to the present invention.

FIG. 2 is a plan view of the lid body of FIG.

FIG. 3 is a sectional view of a viscous fluid-sealed damper according to another embodiment of the present invention.

FIG. 4 is a plan view of the lid body of FIG.

FIG. 5 is a sectional view of a viscous fluid-sealed damper according to another embodiment of the present invention.

FIG. 6 is a plan view of the lid body of FIG.

FIG. 7 is a sectional view of a viscous fluid-sealed damper according to another embodiment of the present invention.

FIG. 8 is a sectional view of a viscous fluid-sealed damper according to another embodiment of the present invention.

FIG. 9 is a sectional view of a viscous fluid-sealed damper according to another embodiment of the present invention.

FIG. 10 is a sectional view of a viscous fluid-sealed damper according to another embodiment of the present invention.

FIG. 11 is a cross-sectional view of a viscous fluid-sealed damper according to another embodiment of the present invention, showing a state before assembly.

12 is a sectional view of the viscous fluid-sealed damper shown in FIG.

FIG. 13 is a graph showing the vibration absorption characteristics of the viscous fluid-sealed damper of the present invention.

FIG. 14 is a cross-sectional view of a conventional viscous fluid-sealed damper.

[Explanation of symbols]

 10 Viscous Fluid-Encapsulated Damper 12 Damper Main Body 12A Opening 14 Lid 16 Viscous Fluid 28 Orifice 30 Outer Wall (Closing Member) 32 Pressure Contact Member 38 Sealing Member

Claims (5)

[Claims] 1. A substantially cylindrical damper body having an opening at one end and a bottom portion at the other end and containing a viscous fluid therein, and closing the opening of the damper body while closing the opening. An elastic lid having a recess formed on the side opposite to the damper body, a closing member for closing the recess of the lid, and an orifice formed in the lid for communicating the recess and the outside of the recess. And a viscous fluid-filled damper. 2. The viscous fluid-sealed damper according to claim 1, wherein the orifice is formed along the periphery of the lid. 3. The viscous fluid-sealed damper according to claim 1, wherein the orifice is formed in the closing member. 4. The viscous fluid-sealed damper according to any one of claims 1 to 3, further comprising: a pressure contact member for sandwiching the lid member and the damper body in a pressure contact state with the closing member, A viscous fluid-sealed damper, wherein a sealing member is integrally formed at a portion of the lid body that abuts the closing member. 5. The viscous fluid-sealed damper according to any one of claims 1 to 4, wherein a seal member is integrally formed at a portion of at least one of the lid body and the damper body that abuts the pressure contact member. Damper filled with viscous fluid.