JPS5924293B2 - 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.

Engine mounts are required to have a large damping coefficient in the low frequency range (near 15 Hz) and a small dynamic spring constant 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.

The present invention aims to solve these problems and provide a further improved vibration-proof support of this type.

In order to achieve this object, the present invention integrally provides fittings at both ends of a thick cylindrical body made of a rubber elastic body to close the ends of the cylindrical body, and at least one of the fittings has the above-mentioned fittings. A small hole that communicates with the outside from the cylindrical body, and an enclosure that is separated from the small hole and has a sheet-like part at least partially made of rubber elasticity are integrally formed, and the cylindrical body and the enclosure communicate through the small hole. In a vibration-proofing support formed by sealing a fluid inside, both ends of a thick cylindrical body made of a rubber elastic body are formed into outwardly inclined conical surfaces, and the mounting fittings are in contact with the conical surfaces. The portion has a conical surface inclined inward so as to coincide with both ends of the cylindrical body, and the cylindrical body has a conical surface inclined inwardly at different positions on both the inner and outer surfaces of the cylindrical body at appropriate pitches in the radial direction. The anti-vibration support is constructed by providing a vertical groove formed by extending an elongated notch in the axial direction.

FIGS. 1 and 2 show an embodiment of the present invention.

In the figure, 1 is a cylindrical body made of a rubber elastic body, and a mounting bracket 2 having a mounting bolt 2a is integrally provided at one end of the cylindrical body 1 so as to close the end of the cylindrical body. A mounting bracket 3 having a mounting hole 3a is integrally provided at the other end of the cylindrical body.

The mounting bracket 3 is provided with a small hole 4 that communicates with the outside from the inside 1a of the cylindrical body 1.

On the opposite side of the mounting bracket 3 to the cylindrical body 1, a enclosure 6 made of a rubber elastic body, which is spaced apart from the small hole 4 and partially forms a sheet-like portion 5, is arranged so as to form a chamber 5a on the outer surface of the small hole 4. Mounting bracket 3
is integrally formed.

Further, both ends of the cylindrical body 1 are formed into outwardly inclined conical surfaces, and inwardly inclined conical surfaces 2b are formed to coincide with both ends of the cylindrical body 1 of the mounting brackets 2 and 3. 3b
It is said that

io and il are vertical grooves, which are elongated notches bored in the radial direction at appropriate pitches at different positions in the radial direction on both the inner and outer surfaces of the cylindrical body 1 and extending in the axial direction. It was drilled in this way.

A fluid such as water is sealed in the interior 1a of the cylindrical body 1 and the chamber 5a.

In the above embodiment, when the external force P acts to bring the mounting fittings 2 and 3 closer together and the cylinder 1 is compressed to the chain line S in the direction of extension of the center line of the cylinder 1, the cylinder 1 is The cylindrical surface 2b has both ends formed into outwardly inclined conical surfaces, and the mounting fittings 2 and 3 sides also inwardly inclined in accordance with the conical surfaces.

3b, outward deformation is suppressed,
As shown in FIG. 1 by curved chain lines, vertical grooves 10 are deformed inwardly and are provided in advance on the inner and outer surfaces of the cylindrical body 1.
11, the inner diameter of the cylindrical body 1 can be easily reduced as shown by the chain line in FIG. 2, and the volume of the cylindrical body 1a can be significantly reduced.

Further, as the volume of the interior 1a decreases, the fluid in the interior 1a flows into the chamber 5a through the small hole 4, but the wall of the chamber 5a is
Since the sheet-like part 5 made of a rubber elastic body that can be deformed independently of Since it is deformed so that it can increase in size, fluid can easily flow out of the small hole 4 from the interior 1a and flow into the interior 1a.

It goes without saying that the small hole 4 and the enclosure 6 may also be provided on the mounting bracket 2 side.

Therefore, according to the present invention, it is possible to install a vibration-proof support body that can arbitrarily design the fluid resistance of the fluid passing through the small hole 4, and at this time, the volume of the cylindrical body 1 can be reduced to the inner and outer circumferential surfaces of the inner cylinder 1. The pre-provided vertical grooves 1o, ii allow the inner diameter to be reduced without difficulty, the required fluid resistance can be easily obtained, and a vibration-proof support with a significantly larger damping coefficient in the low frequency range than the conventional one can be provided.

Incidentally, longitudinal grooves 1 are formed on the inner and outer peripheral surfaces of the cylindrical body 1 made of a rubber elastic body.
0, 11 are provided, as shown in FIG.
Are the groove bottom positions (a) and openings of each of the grooves in No. 11 arranged on the same circumference (indicated by dotted lines), and whether the groove bottom position openings provided on the outer peripheral surface match the groove bottom positions (a) provided on the inner peripheral surface. Alternatively, if it is located inward, when the cylindrical body 1 is compressed by the action of the external force P, it becomes possible to more effectively mesh the inner diameter.

[Brief explanation of drawings]

FIG. 1 is a longitudinal view illustrating a vibration-proof support according to the present invention. The sectional view, FIG. 2, is a sectional view taken along line 1-II in FIG. 1... Cylindrical body, 1a... Inside, 2, 3
...Mounting bracket, 2a...Mounting bolt,
3a...Mounting hole, 4...Small hole, 5.
... Sheet-shaped part, 5a ... Chamber, 6 ...
...enclosure, 10,11... vertical groove.

Claims (1)

[Scope of Claims] 1. 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 mounting fittings is connected to the outside from the cylindrical body. integrally forming a small hole and an enclosure separated from the small hole and having a sheet-like part at least partially made of a rubber elastic body;
In the vibration-proof support body, which is formed by sealing a fluid in the cylindrical body and the enclosure, which communicate through the small hole, both ends of a thick cylindrical body made of a rubber elastic body are inclined outward. The mounting bracket has a conical surface inclined inward so as to coincide with both ends of the cylindrical body, and the mounting bracket has a conical surface that is inclined inward so as to coincide with both ends of the cylindrical body. A vibration-proof support body characterized in that vertical grooves are provided at different positions at appropriate pitches by extending radially elongated notches in the axial direction. 2. The groove bottom positions of the longitudinal grooves bored on both the inner and outer surfaces of a thick-walled cylindrical body made of rubber elastic material are on the same circumference on the inner and outer peripheral surfaces, respectively, and the groove bottoms provided on the outer peripheral surface are The vibration isolating support according to claim 1, wherein the position of the vibration isolating support corresponds to or is located inward from the bottom of the groove provided on the inner circumferential surface.