JPH0740747Y2 - Fluid filled type anti-vibration device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a fluid filled type vibration damping device.

(Prior Art) A fluid filled type vibration damping device is known in which a vibration body such as an engine is attached to a fixed side while reducing the vibration.

Such a fluid filled type vibration damping device generally supports a vibrating body and forms a main fluid chamber inside, a main elastic body that forms a sub fluid chamber inside, the main fluid chamber and the sub fluid chamber. It comprises a partition member that defines a chamber and a communication passage that connects the main fluid chamber and the sub fluid chamber.

(Problems to be solved by the invention) By the way, since the sub-elastic body is formed with a smaller elastic coefficient than the main elastic body, it is easily deformed. Therefore, the distance from the partition member deviates from the set value (for example, the sub-elastic body). The body approaches or separates from the partition member), the volume of the sub-fluid chamber changes, and the vibration damping characteristics may be different from the initial setting.

The present invention has been made in view of such conventional problems,
The object of the invention is to provide a fluid-filled type vibration damping device capable of keeping the volume of the sub-fluid chamber at a constant time without shifting the gap between the sub-elastic body and the partition member.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a main elastic body that supports a vibrating body and forms a main fluid chamber therein, and an elastic coefficient smaller than that of the main elastic body. A sub-elastic body that forms a sub-fluid chamber, a partition member that defines the main fluid chamber and the sub-fluid chamber,
In a fluid-filled type vibration damping device including a communication passage that connects the main fluid chamber and the sub-fluid chamber, the inner wall of the sub-elastic body is brought into contact with the partition member while the main elastic body is not receiving a load. It is characterized in that a protrusion is provided.

(Operation) Since the inner wall of the sub-elastic body is provided with a protrusion that comes into contact with the partition member in the state where the main elastic body is not receiving a load, the protrusion keeps a constant distance between the partition member and the sub-elastic body. Therefore, the volume of the auxiliary fluid chamber can be made constant.

(Embodiment) A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a vertical cross-sectional view of a fluid filled type vibration damping device according to a first invention, in which 1 is a supporting member, and the supporting member 1 is a supporting portion 3 and a cylindrical portion which are attached to a fixed side of a vehicle body or the like. 5, the cylindrical portion 5 further comprises a tapered portion 5a and an annular support portion 5b.

Reference numeral 7 denotes a mounting member which is mounted on a vibration source such as an engine by a bolt 9. The inner periphery of the main elastic body 10 is joined to the outer periphery of the mounting member 7 by baking or the like, and the outer periphery of the main elastic body 10 is Bake on the inner circumference of the tapered portion 5a. Further, an annular ring 11 concentric with the mounting member 7 and having a large diameter and having a substantially cylindrical shape is embedded in the main elastic body 10.

Below the main elastic body 10, a sub elastic body 12 having an elastic coefficient smaller than that of the main elastic body 10 is provided, and the main elastic body 10 and the sub elastic body 12 are provided.
To form the fluid chamber S. Further, a partition member 14 is provided between the main elastic body 10 and the sub elastic body 12, and the fluid chamber S is formed by the partition member 14.
Is divided into a main fluid chamber S1 and a sub fluid chamber S2.

The sub elastic body 12 is composed of a thick portion 12a, a thin portion 12b formed on the outer periphery of the thick portion 12a, and a mounting portion 12c formed on the outer periphery of the thin portion 12b. By attaching the outer periphery of the mounting portion 12c to the inner periphery of the cylindrical portion 3b of the supporting portion 3, the mounting portion 12c is mounted inside the supporting portion 3. If the outer periphery of the mounting portion 12c is directly attached to the inner periphery of the cylindrical portion 3b in this manner, a metal mounting bracket is mounted on the outer periphery of the mounting portion 12c and the mounting bracket is mounted on the supporting portion 3 as compared with the conventional structure. The number of points and the weight can be reduced. The thick portion 12a
An annular contact portion 12d is formed substantially in the center of the lower surface, and a hole 12e is formed in the annular contact portion 12d. Also, the thick portion 12
A protrusion 12f is formed on the upper surface of a, and a groove 12g is formed on the upper surface side of the protrusion 12f.

A hole 12h for injecting a fluid is formed in the protrusion 12f.
A rivet 15 is provided in the h, and the rivet 15 sandwiches the metal plate 12i embedded in the thick portion 12a and the thick portion 12a. The metal plate
12i functions as a sealing material, and in this embodiment, the bulging portion 15a below the rivet 15 further functions as a sealing material, so that a double sealing structure is formed and the sealing performance is improved. Further, in the present embodiment, the hole 12h is closed by the rivet 15, so that the hole 12h can be closed more reliably as compared with the conventional case where the hole 12h is closed by a ball.

The sub elastic body 12 is formed in advance so that the projection 12f abuts on the partition member 14 side in a state where the main elastic body 10 does not receive a load. That is, the sub elastic body 12 is attached with a predetermined elasticity, and the projection 12f contacts the partition member 14 by this elasticity.

The annular supporting portion 5b is made up of the flange portion 3a formed on the supporting portion 3 and upper and lower metal holding plates forming a part of the partition member 14.
Hold the edges of 16,18.

Further, the holding plates 16 and 18 are substantially circular in plan view and have a plurality of holes 1.
6a ..., 18a ... Are formed, and a holding member 17 is provided substantially at the center of the holding plates 16 and 18, and the holding members 17 keep the spacing between the holding plates 16 and 18 constant. Holding plate 16,18
A rubber regulating member 20 is provided between them, and the regulating member 20 is composed of upper and lower plate-shaped members 20a and 20b. These plate-like members 20a, 20b have holes 20a1 which match the holes 16a ,, 18a.
,, 20b1 ... and a movable plate between the plate members 20a, 20b.
21 is installed.

A spiral channel 28 is formed between the plate-shaped members 20a and 20b,
The flow path 28 connects the main fluid chamber S1 and the sub fluid chamber S2 through the openings 28a and 28b.

A cover member 31 that covers the sub elastic body 12 from below is attached to the lower side of the sub elastic body 12, and the air chamber S3 is formed by the cover member 31 and the sub elastic body 12.

The cover member 31 is attached by press-fitting its upper opening edge into an annular groove 12j formed in the lower surface of the sub elastic body 12. Conventionally, the upper opening edge of the cover member 31 is press-fitted and attached to the inner circumference of the cylindrical portion 3b of the support portion 3. In such a structure, the rust-preventive paint applied to the inner circumference of the cylindrical portion 3b is peeled off at the time of press fitting. However, since the structure of this embodiment is mounted on the sub elastic body 12, such a problem does not occur.

In the fluid filled type vibration damping device having the above structure, when the fluid is injected into the fluid chamber S at the time of manufacturing, it is performed as shown in FIG.

In the figure, reference numeral 50 denotes a support base, and the fluid filled type vibration damping device has the support portion 3 mounted on the support base 50 upside down. or,
The cover member 31 and the rivet 15 are not attached,
The lower surface opening edge of the seal jig 52 is fitted in the annular groove 12j. In addition, the inside of the seal jig 52 is a switching valve via a hose 54.
It communicates with 56. The switching valve 56 has a port 56a into which the end of the hose 54 is fitted, and a port 5 communicating with the vacuum pump.
A port 56c communicating with 6b and the fluid storage device is formed.

First, the port 56b and the hose 54 are made to communicate with each other to evacuate the air in the fluid chamber S to create a vacuum state. Then, the port 56c and the hose 54 are connected to each other to inject the fluid into the fluid chamber S from the fluid storage device.

According to such a structure, a pressure difference between the sub-fluid chamber S2 and the space S4 formed between the seal jig 52 and the sub-elastic body 12 hardly occurs during the air bleeding operation, and the sub-elastic body 12 moves up and down. There is nothing to do. Therefore, the durability of the sub elastic body 12 can be improved.

As described above, in the present embodiment, the sub elastic body 12 is formed so as to contact the partition member 14 side in the state where the main elastic body 10 does not receive a load, so that the sub elastic body 12 and the partition member are always kept at a constant distance. You will be drunk. Therefore, the sub-fluid chamber S2 maintains a constant volume, and particularly when injecting the fluid at the time of manufacturing, the amount of fluid as the initial setting can be enclosed, and the vibration isolation performance can be secured as the initial setting.

Further, in this embodiment, since the groove 12g is formed in the protrusion 12f,
Although the projection 12f is in contact with the partition member 14 during the air bleeding operation, the air in the fluid chamber S can be easily sent into the sealing jig 52 through the groove 12g.
Similarly, at the time of fluid injection, the fluid chamber S is inserted through the groove 12g.
The fluid can be easily injected therein.

FIG. 3 shows another embodiment of the present invention. In this embodiment, a groove 12 is formed on the upper surface of the sub elastic body 12 from a thick portion 12a to a thin portion 12b.
forming k.

Generally, when the vibration source is largely displaced upward, a large amount of fluid in the sub-fluid chamber S2 flows out to the main fluid chamber S1, and the sub-elastic body 12 moves to the partition member 14 side as shown in FIG. The vicinity of the connecting portion between the thick portion 12a and the thin portion 12b contacts the partition portion 14. Therefore, the sub-fluid chamber S2 has two parts S2a,
The fluid remaining in the portion S2a is sealed because it is defined by S2b. However, in this embodiment, since the groove 12k is formed on the upper surface of the sub-fluid 12 as described above, the two portions S2a and S2b are communicated by this groove 12k, and the fluid left in the portion S2a is passed through the groove 12k. It can be made to flow into the part S2b. Therefore, the fluid in the portion S2a can be effectively used, and the amount of fluid in the fluid chamber S can be substantially increased.

(Effect of the Invention) As described above, according to the present invention, the inner wall of the sub-elastic body is provided with the protrusion that comes into contact with the partition member in the state where the main elastic body is not loaded. The distance from the body can be made constant, and the volume of the auxiliary fluid chamber can be made constant.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a fluid filled type vibration damping device according to the present invention,
FIG. 2 is a diagram showing a state of injecting a fluid into the fluid filled type vibration damping device, and FIG. 3 is another embodiment. In the drawing, 10 is a main elastic body, 12 is a sub elastic body, 12f is a protrusion, 1
4 is a partition member, S1 is a main fluid chamber, and S2 is a sub fluid chamber.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masahiro Nakamura 1-4-1 Chuo, Wako-shi, Saitama Inside Honda R & D Co., Ltd. (72) Creator Masanori Minami 1-4-1 Chuo, Wako-shi, Saitama Incorporated in Honda R & D Co., Ltd. (56) References JP-A-63-38730 (JP, A) Actual development: S58-175230 (JP, U)

Claims (2)

[Scope of utility model registration request] 1. A main elastic body that supports a vibrating body and forms a main fluid chamber therein; a sub elastic body that has a smaller elastic coefficient than the main elastic body and forms a sub fluid chamber inside; A fluid-filled type vibration damping device comprising a partition member that defines a body chamber and a sub-fluid chamber, and a communication path that communicates the main fluid chamber and the sub-fluid chamber, wherein the main elastic member is provided on the inner wall of the sub-elastic body. A fluid-filled type vibration damping device comprising a protrusion that abuts the partition member when the body is not receiving a load. 2. The sub-elastic body is formed with a fluid injection port, the projection is located between the injection port and the communication passage opening, and the projection is partitioned by the projection. The fluid filled type vibration damping device according to claim 1, wherein a passage that connects the injection port and the communication passage opening in a state of being in contact with the member is formed.