JPH07243472A - Liquid-sealed vibration control device - Google Patents

Abstract

PURPOSE:To provide a liquid-sealed vibration insulation device which is constituted to simplify structure, facilitate manufacture, and reduce a cost. CONSTITUTION:A liquid-seal vibration insulation device is provided with a main liquid chamber 2 wherein a thick rubber resilient substance 1 forms a chamber wall and an auxiliary liquid chamber 4 wherein a rubber resilient substance film 3 forms a chamber wall and which is partitioned from the main liquid chamber 2 by a partition plate 5. The outer peripheral parts of the thick rubber resilient body 1, the partition plate 5, and the rubber resilient substance film 3 are overlapped with each other and fixed by a metallic side plate 6. The outer periphery of the rubber resilient film 3 is formed in a thick section and a groove 33 is formed and a liquid flow passage 9 is formed between the outer periphery of the partition plate 5 and the rubber resilient substance film. A communication hole 35 for intercommunicating the main liquid chamber 2 and the liquid flow passage 9 is formed in a part of the rubber resilient substance film 3 and the partition plate 5 and a communicating hole 36 for intercommunicating the auxiliary liquid chamber 4 and the liquid flow passage 9 is formed in other spot of the rubber resilient substance film 3. A recessed part 54 is formed in the outer peripheral part of the partition plate 5 and fitted in the opening of the groove 33 of the rubber resilient substance film 3. A protrusion part 11 formed along the outer peripheral part of the thick rubber resilient substance l is fitted in the recessed part 54.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid filled vibration damping device,
In particular, it relates to the structure of the liquid flow path.

[0002]

2. Description of the Related Art FIG. 3 shows a typical structure of a conventional liquid filled vibration damping device. The liquid-filled anti-vibration device has a main liquid chamber 2 having a thick rubber elastic body 1 as a chamber wall, a thin rubber elastic body film 3 as a chamber wall, and the main liquid chamber 2 having a disc-shaped partition plate 5. It has a sub liquid chamber 4 defined by The outer peripheral portions of the rubber elastic body 1, the partition plate 5, and the rubber elastic body film 3 are caulked and fixed integrally with the outer peripheral portion of the support plate 8 by the metal side plate 6, and the connecting member is attached to the upper surface of the rubber elastic body 1. 71, a connecting member 71 is projectingly provided on a support plate 8 for supporting the rubber elastic film 3 from below, and the liquid filled vibration isolator is arranged between the vibrating body and the vehicle body by these connecting members 71 and 72. To be done.

A liquid flow path 51 is formed in the outer peripheral portion of the partition plate 5. Further, communication holes 521 and 531 are formed to connect the liquid flow path 5 to the main liquid chamber 2 and the sub liquid chamber 4, respectively. Then, as the vibration is input, the enclosed liquid flows between the liquid chambers 2 and 4 through the liquid flow path 51 and the communication holes 521 and 531 to attenuate the vibration.

[0004]

However, since forming the liquid flow path 51 on the outer periphery of a single plate is quite troublesome, as shown in the figure, the plate members 52 and 53 whose both ends are bent are processed. Communication holes 521 and 531 are provided, and these 2
A means for forming the partition plate 5 by stacking the plate members 52 and 53 is generally used. Therefore, the number of parts increases,
There is a problem that it takes time and labor to process the plate materials 52 and 53. Further, in order to improve the rigidity of the outer peripheral portion of the thin rubber elastic body film 3, it is usually necessary to embed an iron ring 31 in the rubber elastic body film 3 as shown in the figure or to bond it to the surface of the rubber elastic body film 3. That was the cause of the increase in production cost.

On the other hand, there is known a liquid-filled anti-vibration device in which a partition plate is deep-drawn to form an orifice on the outer periphery for communicating the main liquid chamber and the sub liquid chamber (Japanese Utility Model Laid-Open No. 4-39444).
However, the structure is complicated, the processing is not easy, and it is not economical.

Therefore, the present invention is to provide a liquid-filled vibration isolator which has a simple structure, is easy to manufacture, and is low in manufacturing cost.

[0007]

The structure of the present invention will be described with reference to FIG. 1. A liquid filled vibration isolator comprises a first liquid chamber 2 having a thick rubber elastic body 1 as a chamber wall, and a thin rubber elastic body. A body wall 3 is used as a chamber wall, a partition plate 5 is provided with a second liquid chamber 4 that is partitioned from the first liquid chamber 2, and a liquid flow path 9 that connects the both liquid chambers 2 and 4 is provided. There is. The outer peripheral portions of the thick rubber elastic body 1, the partition plate 5 and the rubber elastic body film 3 are overlapped with each other and wrapped around from the outside and fixed by the metal side plate 6, and the outer peripheral portion 32 of the rubber elastic body film 3 is thickened. A groove 33 that opens upward as a meat is provided to form an annular liquid flow path 9 between the outer peripheral portion 32 and the outer peripheral portion of the partition plate 5, and the outer peripheral portion of the partition plate 5 and the rubber elastic film 3 are formed. The outer peripheral part 32 of the first liquid chamber 2
And a first communication hole 35 for communicating the liquid flow path 9 with the liquid flow path 9 is formed, and the other part of the outer peripheral portion 32 of the rubber elastic film 3 is penetrated therethrough to form the second liquid chamber 4 and the liquid flow. A second communication hole 36 for communicating with the passage 9 is provided (Claim 1).

A concave portion 54 is formed along the outer peripheral portion of the partition plate 5, and the concave portion 54 is fitted into the opening of the groove 33 of the rubber elastic film 3 and the thick rubber is formed in the concave portion 54. Protrusions 11 formed along the outer periphery of the elastic body 1
Are fitted together (claim 2). The rubber elastic film 3
A fin-shaped seal portion 37 is provided on the periphery of the thick outer peripheral portion 32 (FIG. 2), and the seal portion 37 is pressed against the inner surface of the metal side plate 6 (claim 3).

[0009]

When the thick rubber elastic body 1 is deformed by vibration input, the enclosed liquid in the first liquid chamber 2 flows into the liquid passage 9 through the first communication hole 35. The enclosed liquid flowing through the liquid flow path 9 flows into the sub liquid chamber 4 through the second communication hole 36, and a large vibration damping force is generated due to the flow resistance at this time. Further, in the present invention, the groove 33 is formed in the thick outer peripheral portion of the rubber elastic body film 3 to form the liquid flow path 9, and the rubber elastic body film 3 having the groove 33 can be integrally formed by molding. Extremely high productivity and low cost. Further, the thick outer peripheral portion 32 of the rubber elastic film 3 enhances rigidity.

The recess 54 of the partition plate 5 is fitted into the upper opening of the groove 33 of the rubber elastic film 3 to enhance the airtightness of the liquid flow path 9. Further, the projection 11 of the thick rubber elastic body 1 is inserted and fixed in the recess 54 to improve the sealing property. When the seal portion 37 is provided on the peripheral edge of the outer peripheral portion 32 of the rubber elastic film 3, the sealing property is further enhanced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIGS. 1A and 1B, reference numeral 1 is a thick rubber elastic body having a lower end opening formed into a container, and the inside thereof is a main liquid serving as a first liquid chamber having a chamber wall. There is room 2. A thin rubber elastic film 3 is disposed below the rubber elastic body 1, and a metal partition plate 5 disposed above the rubber elastic film 3 separates the interior from the main liquid chamber 2 into a second liquid chamber. The barrel is used as the auxiliary liquid chamber 4.

The partition plate 5 and the outer circumference of the rubber elastic body film 3 are sequentially superposed on the outer peripheral portion of the rubber elastic body 1, and a container-like support plate 8 is arranged below the rubber elastic body film 3.
The lower end of the metal side plate 6 supporting the outer periphery of the rubber elastic body 1 is curved in a C-shape while being supported by the outer peripheral portion of the rubber elastic body 1, the partition plate 5, the rubber elastic body film. The outer circumferences of 3 and the side plate 6 are wrapped and caulked and fixed.

A connecting member 71 is fixed to the center of the upper surface of the rubber elastic body 1, and a vibrating body such as an engine is connected to the connecting member 71. On the other hand, a connecting member 72 is fixed to the center of the lower surface of the support plate 8 to connect the vibration isolator to the vehicle body panel or the like.

The rubber elastic film 3 has a thick outer periphery, and an annular groove 33 opening upward in the center of the outer peripheral portion 32.
Are formed (FIG. 1 (C)). On the other hand, a concave portion 54 along the groove 33 of the rubber elastic film 3 is provided on the outer periphery of the partition plate 5.
Is formed (FIG. 1 (B)) and is fitted into the upper opening of the groove 33 to form a tunnel-shaped liquid flow path 9. Also,
The partition plate 5 has an inner portion of the concave portion 54 bent downward along the outer peripheral portion 32 to restrict the movement of the rubber elastic film 3. A convex portion 11 protruding downward is formed on the lower end edge of the rubber elastic body 1, and is pressed into the concave portion 51 of the partition plate 5 to improve the sealing property.

A partition wall 34 is formed in a part of the groove 33 so as to block the liquid flow path 9 (see FIG. 1).
(C)) A first communication hole 35 is provided so as to penetrate a part of the inner wall of the groove 33 close to the partition wall 34 and a part of the partition plate 5 adjacent thereto. Thereby, the main liquid chamber 2 and the liquid flow path 9 are formed.
Communicate with each other. In addition, the second inner wall of the groove 33 is similarly cut out at a position facing the communication hole 35 with the partition wall 34 interposed therebetween.
Communication hole 36 is provided. A part of the partition plate 5 adjacent to the communication hole 36 is processed so as to float from the inner wall surface of the groove 33 to form a relief portion 55 (FIG. 1 (A),
(C)), the communication hole 36 is opened to the sub liquid chamber 4.

Thus, the main liquid chamber 2 is supplied by the vibration input.
When is deformed, the enclosed liquid in the main liquid chamber 2 flows into the liquid flow passage 9 through the communication hole 35 (indicated by an arrow in FIG. 1C). The enclosed liquid that has circulated in the liquid flow path 9 has the communication hole 36.
It further flows into the auxiliary liquid chamber 4 via the relief portion 55, and in this process vibration is damped.

In the above structure, the recess 54 is formed on the outer periphery of the partition plate 5 along the groove 33 of the rubber elastic film 3, but the recess 54 does not necessarily have to be provided.

FIG. 2 shows another embodiment of the present invention. In this embodiment, a fin-shaped thin seal portion 37 is formed on the outer peripheral edge of the rubber elastic film 3 so as to project. The tip of the seal portion 37 is pressed against the inner surface of the metal side plate 6 to further improve the sealing property of the fastening portion.

[0019]

According to the present invention, the liquid flow path is constituted by the partition plate and the groove formed in the thick outer peripheral portion of the rubber elastic film, and the rubber elastic film having the groove in the outer peripheral portion is integrally molded. In addition, since it is not necessary to process the partition plate, the productivity of the liquid-filled vibration isolator is improved and the structure is simplified. Further, since the outer peripheral portion of the rubber elastic film is made thick, the rigidity is improved and it is not necessary to use a reinforcing member such as an iron ring.

The outer peripheral portion of the partition plate and the rubber elastic film having the groove are fitted in a concavo-convex shape, and the outer peripheral portion of the partition plate and the outer peripheral portion of the rubber elastic body are fitted together to form a close contact. Sex is further improved. When a fin-shaped seal portion is further provided on the outer periphery of the rubber elastic film, higher sealing performance can be obtained.

[Brief description of drawings]

1A is an overall cross-sectional view of a liquid-filled anti-vibration device, FIG. 1B is an enlarged view of part B of FIG. 1A, and FIG. 1C is an overall cross-section of a rubber elastic film. FIG. 2 is a sectional view taken along the line CC of FIG.

FIG. 2 is a partially enlarged cross-sectional view of a liquid filled vibration damping device.

FIG. 3 is an overall sectional view of a conventional liquid filled vibration damping device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rubber elastic body 2 Main liquid chamber (first liquid chamber) 3 Rubber elastic body film 32 Thick portion 33 Groove 35 First communication hole 36 Second communication hole 37 Seal part 4 Sub liquid chamber (second liquid chamber) Chamber) 5 Partition plate 54 Recessed part 55 Relief part 6 Metal side plate 9 Liquid flow path

Front page continued (72) Inventor Ri Nakagaki 1 Ochiai, Nagachibata, Kasuga-cho, Nishi-Kasugai-gun, Aichi Prefecture, Toyoda Gosei Co., Ltd. In the company

Claims (3)

[Claims] 1. A first liquid chamber having a thick rubber elastic body as a chamber wall, and a thin rubber elastic film as a chamber wall, and a partition plate for the first chamber.
In the liquid-filled anti-vibration device, which is provided with a second liquid chamber that is partitioned from the liquid chamber and has a liquid flow path that connects the liquid chambers to each other, the thick rubber elastic body, the partition plate, and the rubber elastic film The outer peripheral portions are overlapped with each other and fixed by metal side plates so as to wrap them from the outside, and the outer peripheral portion of the rubber elastic film is made thick and a groove opening upward is provided to form the outer peripheral portion and the outer peripheral portion of the partition plate. A first communication for forming an annular liquid flow path therebetween and for penetrating the outer peripheral portion of the partition plate and the outer peripheral portion of the rubber elastic film to connect the first liquid chamber and the liquid flow passage. A hole is formed, and a second communicating hole is formed in another portion of the outer peripheral portion of the rubber elastic body film, the second communicating hole penetrating therethrough and communicating the second liquid chamber with the liquid flow path. Liquid filled anti-vibration device. 2. A partition is formed along the outer peripheral portion of the partition plate, the recess is fitted in the opening of the groove of the rubber elastic film, and the outer peripheral portion of the thick rubber elastic body is fitted in the recess. The liquid-filled vibration isolator according to claim 1, wherein a protrusion formed along the line is fitted. 3. A fin-shaped seal portion is provided on the periphery of a thick outer peripheral portion of the rubber elastic film, and the seal portion is pressed against the inner surface of the metal side plate. Liquid-filled anti-vibration device.