JPS608196Y2 - Anti-vibration support - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to resilient supports such as engine mounts.

In the well-known anti-vibration support in which a rubber block is interposed between two mounting fittings, the loss coefficient of rubber is small, so the damping coefficient is small.

As an engine mount, it is suitable for low frequency range (around 15Hz).
It is required that the damping coefficient is large in the high frequency range (around 100 Hz) and the dynamic spring constant is small in the high frequency range (near 100 Hz).

In order to meet these demands, an elastic support that utilizes the elasticity of rubber and the flow resistance of fluid was developed in Japanese Patent Publication No. 48-3615.
This method has been proposed in Japanese Patent Publication No. 1 and Japanese Patent Publication No. 52-16554.

However, in this elastic support, the two chambers, which are connected by a communication passage and filled with fluid, are mostly surrounded by inner and outer rigid metal cylinders, and the volume change of the rubber part due to the vibration stroke is relatively small. , because of this, the flow rate of fluid is small,
It is difficult to take distribution resistance freely.

In addition, any part of the rubber surrounding the two chambers filled with fluid is used as a load support, so it is difficult to deform and suppresses the flow of fluid.

Therefore, from this point of view as well, there is a drawback that the fluid flow resistance cannot be fully utilized.

In order to solve this problem, anti-vibration supports as shown in FIGS. 1 and 2 have been proposed.

That is, a thick cylindrical body 1 made of a rubber elastic body has a circular cross-sectional shape 1b in its hollow part, and the cylindrical body 1 is provided at both ends.
At least one of the mounting brackets 3 has a small hole 4 through which the cylindrical interior 1a communicates with the outside; An enclosure 5 having a sheet-like portion consisting of an enclosure 5 is integrally formed, and a fluid is sealed in the cylindrical interior 1a and the enclosure 5a, which communicate through the small hole 4. A vibration-proofing support has been proposed in which a member 7 such as a band-like band made of a material with high tensile strength is provided on the outer periphery of the cylindrical body 1 to suppress outward deformation when the cylindrical body 1 is moved.

In the vibration isolating support having the above structure, the excitation force P is applied, the distance l between the mounting plates 2 and 3 is reduced, and when the distance l between the mounting plates 2 and 3 reaches the position 1' (indicated by the dotted line), the interior 1a of the cylinder 1 The volume of the cylindrical body 1 also decreases (indicated by the dotted line), and at this time, the fluid sealed inside the cylinder 1 becomes
It passes through the small hole 4 provided in the mounting plate 3 and moves into the enclosure 5a.

At this time, the damping coefficient is obtained by the flow resistance when the fluid passes through the small holes 4.

However, in the above structure, the rubber elastic body has incompressible properties, and the hollow cross-sectional shape 1b of the thick cylinder 1 made of the rubber elastic body with such properties is circular. Therefore, even if a member 7 is provided on the outer periphery of the cylinder 1 to suppress outward deformation when the cylinder 1 is compressed in the direction of extension of the center line, when an excitation force P is applied. , in the hollow cross-sectional shape 1b, the circular inner peripheral surface is reduced (as shown by the dotted line)
It has the drawback that it exhibits a large resistance force when the cylinder body 1 is moved, and cannot increase the change in volume of the interior 1a of the cylindrical body 1, making it impossible to obtain a required large damping coefficient.

The present invention was developed in view of the above circumstances, and its gist is that mounting brackets are integrally provided at both ends of a thick cylinder made of a rubber elastic body to close the ends of the cylinder. , at least one of the mounting brackets is integrally formed with a small hole through which the inside of the cylindrical body communicates with the outside, and an enclosure having a sheet-like part, at least a part of which is made of a rubber elastic material, is separated from the small hole, and In the vibration-proof support body in which a fluid is sealed in the cylinder and the enclosure that communicate with each other through holes, the cross-sectional shape of the hollow part of the thick cylinder made of rubber elastic material is rectangular, and the cylindrical A member is provided on the outer periphery of the body to suppress outward deformation when the cylindrical body is compressed in the direction of extension of the center line.

Next, this will be explained according to the drawings in Figures 3 and 4, but the configuration is roughly the same as that explained in Figures 1 and 2, and the same components are designated by the same reference numerals. Therefore, the explanation will be omitted.

3 and 4, the difference from the vibration isolating support explained in FIGS. 1 and 2 is that the vibration isolating support explained in FIGS. A thick cylindrical body 1 made of a rubber elastic body
While the hollow cross-sectional shape 1b is circular, in the present invention shown in FIGS. 3 and 4, the hollow cross-sectional shape 10b of the cylinder 10 is rectangular.

As mentioned above, if the cross-sectional shape 1°b of the hollow part of the cylinder 10 is rectangular, the inner wall surface of the cylinder 10 will easily move inward when the excitation force P is applied, unlike when it is circular. (as shown by the dotted line in FIG. 4), it is possible to greatly change the volume of the interior 10a of the cylinder 10, and therefore the speed at which the fluid sealed in the interior 10a of the cylinder 10 passes through the small holes 4 can be changed. Therefore, the required large damping coefficient can be obtained.

[Brief explanation of the drawing]

1 and 2 are diagrams for explaining a conventional example, in which FIG. 1 is a longitudinal sectional view, FIG. 2 is a sectional view taken along line I-I in FIG.
Figure 4 illustrates the invention. 1... Cylinder, 2, 3... Mounting bracket, 4
...Small hole, 5...Enclosure, 7...
- Suppressing member, 1a...inside the cylinder, 5a...
...Inside the enclosure, 1b...Hollow section cross-sectional shape, 1
0...Cylinder, lea...Inside the cylinder, 10
b...Hollow section cross-sectional shape.

Claims (1)

[Scope of utility model registration request] Mounting fittings that close the ends of the cylindrical body are integrally provided at both ends of a thick cylindrical body made of a rubber elastic body, and at least one of the mount fittings has a small hole that communicates the inside of the cylindrical body with the outside, and a small hole that connects the inside of the cylindrical body to the outside. A vibration-proof support formed by integrally forming an enclosure having a sheet-like part made of a rubber elastic body at least in part, which is separated from the hole, and sealing a fluid in the cylindrical body communicating with the small hole and in the enclosure. In the body, the cross-sectional shape of the hollow part of the thick cylindrical body made of a rubber elastic body is rectangular, and the outer periphery of the cylindrical body is
1. A vibration-proof support, comprising a member that suppresses outward deformation when the cylindrical body is compressed in the direction of extension of its center line.