JPH06213264A - Vibrationproof device - Google Patents

Abstract

PURPOSE:To absorb vibration of a vibration generating part into an elastic body for vibration absorption so as to obstruct transmission to a vibration receiving part and provide sufficient strength of a bracket by connecting a fitting part to one of the vibration generating part or the vibration receiving part, and connecting an inner cylinder to the other of the vibration generating part or the vibration receiving part for the use. CONSTITUTION:When a cylinder part 14 is formed with a steel plate, both end parts in the circumferential direction are overlapped by a decided measure and connected together, hence one end part and the other end part are contacted in face with each other, friction force is applied between both, durability against the force in the circumferential direction is remarkably improved, and the strength of a bracket is improved. Because in particular a vibrationproof device main body 32 is pressed in the cylinder part 14, in the overlapped part 15 of the cylinder part 14, the part arranged inside in the radial direction is sandwiched between the part arranged outside in the radial direction and the body 32, the friction force of the overlapped part 15 is increased by action of compression force due to press-in of the body 32, and durability against the force in the circumferential direction is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolator used in automobiles and general industrial machines for absorbing and attenuating vibrations from a vibration generator, and more particularly to a vibration isolator provided with a mounting bracket.

[0002]

2. Description of the Related Art In an automobile, a vibration isolation device for absorbing and damping engine vibration is arranged between the engine and the vehicle body. Among the vibration damping devices, the bush type vibration damping device includes a bracket, and the bracket is attached to the vehicle body as an example.

As shown in FIG. 7, a bracket 100, which is conventionally formed of a metal plate, comprises a cylindrical portion 104 into which a vibration isolator main body 102 is press-fitted and held, and an attachment arm 106 for attachment to a vehicle body. It is composed of two parts, and the mounting arm 106 and the cylindrical portion 104 are connected by welding 108 (Japanese Utility Model Publication No. 62-17633).

The cylindrical portion 104 of the bracket 100 is
A predetermined steel plate is cut into a rectangular shape, and then rolled to form a cylindrical shape.

[0005]

By the way, in this bracket 100, there is a problem in strength because the split opening 110 of the cylindrical portion 104 is welded only at two points (the portion where the mounting arm 106 straddles).

In view of the above facts, an object of the present invention is to provide an anti-vibration device provided with a bracket having sufficient strength.

[0007]

A vibration isolator according to the present invention comprises a tubular portion having a superposed portion formed by bending a plate material into a tubular shape and superposing one side and the other side in the circumferential direction by a predetermined size in the circumferential direction. An inner cylinder connected to either one of the vibration generating part and the vibration receiving part and arranged inside the cylindrical part; an elastic body arranged between the inner cylinder and the cylindrical part; An attachment that is connected to the other of the generating portion and the vibration receiving portion, is disposed on the outer peripheral side in the radial direction of the tubular portion, and is welded to the outer peripheral surface of the tubular portion across the plate material end portion of the overlapping portion. It is characterized by having a section and.

[0008]

In the vibration isolator of the present invention, the mounting portion is connected to either the vibration generating portion or the vibration receiving portion, and the inner cylinder is connected to either the vibration generating portion or the vibration receiving portion. Then, the vibration of the vibration generating section is absorbed by the vibration absorbing elastic body and is prevented from being transmitted to the vibration receiving section.

In the vibration isolator of the present invention, when the tubular portion is formed of the plate material, both end portions in the circumferential direction are overlapped by a predetermined size so that one end portion and the other end portion are in surface contact with each other. , The frictional force works between them. Therefore, the tubular portion is fixed so that the mounting portion is welded across the plate material end portion of the overlapping portion so that one side and the other in the circumferential direction of the plate material are not separated from each other, and the frictional force of the overlapping portion acts. In order to
The durability against the force of separating the end portions in the circumferential direction is improved.

[0010]

【Example】

[First Embodiment] A first embodiment of the present invention will be described with reference to FIGS.

As shown in FIGS. 1 and 2, the vibration isolator 10 of this embodiment is provided with a bracket 12. The bracket 12 is formed of a cylindrical portion 14 and a mounting arm 16.

As shown in FIG. 2, the cylindrical portion 14 is formed by bending a steel plate as a plate material into a cylindrical shape. Both ends in the circumferential direction are overlapped with each other by a predetermined size, and the overlapped portion 15 is formed.
Is formed, and the portion arranged on the outer side in the radial direction is provided with a step on the outer side in the radial direction by the dimension of the plate thickness so that no step is formed on the inner peripheral surface.

As shown in FIG. 1, the mounting arm 16 is arranged outside the overlapping portion 15 of the cylindrical portion 14.
The mounting arm 16 is a press-formed product of a steel plate, and is a mounting surface 2 as a first side surface parallel to the axis of the cylindrical portion 14.
0, and the mounting surface 20 extends outside the cylindrical portion 14. A bolt hole 22 for attaching the bracket 12 to either one of the vibration generating portion and the vibration receiving portion (the vehicle body of an automobile, for example) is formed near the center of the mounting surface 20.

The mounting surface 20 is provided on both sides of the mounting surface 20 in the width direction.
Reinforcement wall 2 as second side bent perpendicular to
4 are provided in parallel. The height of the reinforcing wall 24 is gradually reduced as it goes away from the cylindrical portion 14. Further, the reinforcing wall 24 has an arc portion 24A on the side of the cylindrical portion 14 that matches the curvature of the outer peripheral surface of the cylindrical portion 14, and the outer peripheral surface of the cylindrical portion 14 straddling the end portion 18 of the portion arranged radially outward. (See Fig. 1). The cylindrical portion 14
Since the end portion 18 of the outer peripheral surface is a step, the arc portion 24A is also provided with a notch 25 corresponding to the plate thickness of the cylindrical portion 14, so that the arc portion 2 is formed.
4A can be in close contact with the outer peripheral surface of the cylindrical portion 14 over the entire length.

As shown in FIG. 1, the mounting arm 16 has a structure in which the inside of the arcuate portion 24A in the axial direction is welded 30 and fixed to the cylindrical portion 14 over the entire length.

An outer cylinder 34 of the vibration isolator main body 32 is press-fitted and fixed in the cylindrical portion 14 of the bracket 12,
An inner cylinder 36 is arranged inside the outer cylinder 34 in parallel with the outer cylinder 34. A shaft, a bolt, or the like is inserted into the inner cylinder 36, and the inner cylinder 36 is connected to either the vibration generating unit or the vibration receiving unit (an engine of an automobile, for example). Outer cylinder 34 and inner cylinder 3
An elastic body 38 is provided between the elastic body 3 and
8 are vulcanized and bonded to the outer peripheral surface of the inner cylinder 36 and a part of the inner peripheral surface of the outer cylinder 34, respectively.

Next, the operation of this embodiment will be described.
As an example, when the mounting arm 16 is attached to the vehicle body of an automobile by a bolt and the inner cylinder 36 is attached to the engine of the automobile via a shaft or bolts, the vibration of the engine causes the inner cylinder 36, the elastic body 38 and the bracket 12 to vibrate. Is supported on the vehicle body via. At this time, the vibration is absorbed by the resistance based on the internal friction of the elastic body 38, so that the transmission of the engine vibration to the vehicle body is prevented.

In the vibration isolator 10 of this embodiment, when the cylindrical portion 14 is formed of a steel plate, both ends in the circumferential direction are overlapped with each other by a predetermined size and connected, so that one end and the other end are connected. The surface is in contact with the part, frictional force acts between them, and the durability against the force (the force to separate the ends) in the circumferential direction is the cylinder of the conventional vibration isolator in which both ends of the plate material are butted. The strength of the bracket 12 is significantly improved as compared with the parts. In particular, in this embodiment, since the vibration isolator main body 32 is press-fitted into the cylindrical portion 14, in the overlapping portion 15 of the cylindrical portion 14, the portion disposed inside in the radial direction is disposed outside in the radial direction. Installed part and anti-vibration device body 3
The frictional force of the overlapping portion 15 is increased by the compression force of the vibration isolator main body 32 that is sandwiched between them and the vibration damping device main body 32.

In this embodiment, the mounting arm 16 and the cylindrical portion 14 are fixed by welding the inside of the arc portion 24A over the entire length, but the present invention is not limited to this. , The arc portion 24A excluding the notch 25 and the end portion of the mounting surface 20 may be welded to the cylindrical portion 14, and the entire length of the arc portion 24A including the notch 25 and the end portion 18 may be welded to the cylindrical portion 14, The circular arc portion 24 </ b> A excluding the notch 25, the end portion 18 and the end portion of the mounting surface 20 may be welded to the cylindrical portion 14. Also,
Welding 30 may be on either side of the plate of mounting arm 16.

[Second Embodiment] FIG. 3 shows a second embodiment of the present invention.
Follow the instructions below. The same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the vibration isolator 10 of this embodiment, the cylindrical portion 14
As shown in FIG. 3, in the overlapping portion 15 of the axial direction, as shown in FIG. 3, the inner peripheral surface of the portion arranged on the outer side in the radial direction and the outer peripheral surface on the inner side in the radial direction are arranged. A plurality of grooves 40 each having a substantially triangular cross section extending in the direction along the direction are arranged in the circumferential direction. As a result, in the vibration damping device 10 of the present embodiment, the frictional force between the portion arranged on the outer side in the radial direction and the portion arranged on the inner side in the radial direction is significantly increased, and the force in the circumferential direction is increased. The durability against is further improved.

[Third Embodiment] FIG. 4 shows a third embodiment of the present invention.
And it demonstrates according to FIG. The same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 4, the vibration isolator 1 according to this embodiment.
At 0, in the overlapping portion 15 of the cylindrical portion 14, the protrusion 42 bent at a right angle in the radial direction is formed at the center in the width direction of the end portion on the radially inner side.
A slit 44 is formed in the vicinity of the end portion 18 on the radially outer side corresponding to the protrusion 42, and the protrusion 42 is fitted in the slit 44.

As shown in FIG. 5, in the mounting arm 16, the mounting surface 20 is disposed on the side opposite to the end portion 18 side with respect to the projection 42, and the end corner portion of the mounting surface 20 and the end of the projection 42 are arranged. The corner portions are in contact with each other, and the inside of the arc portion 24A excluding the notch 25 and the projection 42 side of the end portion of the mounting surface 20 are welded 30 to the cylindrical portion 14.

In this embodiment, the projection 42 is fitted in the slit 44, and both ends of the mounting arm 16 and the cylindrical portion 14 in the circumferential direction are integrated by the welding 30 of the projection 42 portion. The diameter expansion strength of No. 14 is higher than that of the first embodiment.

In addition to the above, the mounting arm 16 may have the notch 25 and the end portion 18 welded 30 to the cylindrical portion 14. As a result, the diameter expansion strength and the bracket 1 are further increased.
The mounting strength of No. 4 can be improved.

[Fourth Embodiment] FIG. 6 shows a fourth embodiment of the present invention.
Follow the instructions below. The present embodiment is a modification of the third embodiment, and the same components as those in the third embodiment are designated by the same reference numerals and the description thereof will be omitted.

In the present embodiment, the projection 42 projects by a predetermined amount from the outer peripheral surface of the cylindrical portion 14, and the mounting surface 20 is disposed closer to the end 18 than the projection 42 and is in close contact with the projection 42. . In the present embodiment, the tip of the protrusion 42 is also welded 30 to the mounting surface 20, and the circular arc portion 24 excluding the notch 25 is formed.
The outside of A is welded 30 to the outer peripheral surface of the cylindrical portion 14.

In addition, in the present embodiment, the notch 2 is further provided.
5 may be welded 30 to the cylindrical portion 14. by this,
Further, the mounting strength of the bracket 14 can be improved.

In each of the above embodiments, the bracket 12
The outer cylinder 34, the inner cylinder 36, and the elastic body 38 are provided in the cylindrical portion 14 of
However, the present invention is not limited to this, and instead of the vibration isolator main body 32, a bush type vibration isolator main body having another structure, for example, a well-known one in which a liquid is sealed inside is used. It goes without saying that the liquid-filled bush type vibration damping device body may be press-fitted.

[0031]

As described above, since the vibration isolator of the present invention has a structure in which both ends of a cylindrical portion formed by bending a plate material into a cylindrical shape are overlapped with each other, the bracket can have sufficient strength. It has an excellent effect that it can be done.

[Brief description of drawings]

FIG. 1 is a perspective view of a vibration isolation device according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of the vibration damping device according to the first embodiment of the present invention.

FIG. 3 is an enlarged cross-sectional view of the overlapping portion of the cylindrical portion, showing the second embodiment of the present invention.

FIG. 4 is a perspective view of an overlapping portion of cylindrical portions according to the third embodiment of the present invention.

FIG. 5 is a perspective view of a vibration damping device according to a third embodiment of the present invention.

FIG. 6 is a perspective view of a vibration damping device according to a fourth embodiment of the present invention.

FIG. 7 is a perspective view of a conventional vibration damping device.

[Explanation of symbols]

 10 Vibration Isolator 14 Cylindrical Part (Cylinder Part) 15 Overlapping Part 16 Mounting Arm (Mounting Part) 18 Split Port 20 Mounting Surface (First Side) 24 Reinforcing Wall (Second Side) 36 Inner Cylinder 38 Elastic Body

Claims (1)

[Claims] 1. A tubular portion having a superposed portion formed by bending a plate material into a tubular shape and having one and the other circumferential direction overlapped in the circumferential direction by a predetermined dimension, and a vibration disposed inside the tubular portion. An inner cylinder connected to one of the generator and the vibration receiver, an elastic body disposed between the inner cylinder and the cylinder, and connected to the other of the vibration generator and the vibration receiver And a mounting portion that is disposed on the outer peripheral side in the radial direction of the tubular portion and that is welded to the outer peripheral surface of the tubular portion across the plate material end portion of the overlapping portion. Shaking device.