JPH06101728A - Anti-vibration device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a vibration damping device having a bracket that has sufficient strength and that does not complicate welding work. [Structure] The split opening 18 of the cylindrical portion 14 of the bracket 12 is
The convex portion 14A formed at one end in the circumferential direction is formed by fitting the concave portion 14B at the other end. The mounting surface 20 of the mounting arm 16 is disposed so as to straddle the vicinity of the tip of the convex portion 14A in the axial direction, and the reinforcing wall 24 straddles the portions along the axial lines on both axial sides of the convex portion 14A of the split opening 18, respectively. And the cylindrical part 1
Weld 30 to 4. Since the split openings 18 are uneven, it is possible to weld the split openings 18 with the axial end surface in a flat state without requiring complicated positioning work.
Further, the mounting arm 16 of the bracket 12 has a split opening 18
Since it straddles four locations, the cylindrical portion 14 is different from the conventional bracket for an anti-vibration device that straddles only two locations.
Expanded strength is high.

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. 5, a bracket 100, which is conventionally formed of a metal plate, includes a cylindrical portion 104 in 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 order to solve the above-mentioned drawbacks, it is conceivable to weld the split opening 110 of the cylindrical portion 104 over the entire length. However, since the split opening 110 is straight, the welding may bend in the middle. The unwelded portion is generated at the split opening, which is a serious problem in quality.

Further, since the split opening 110 is linear, one end and the other end of the steel plate are often displaced in the axial direction when the one end and the other end of the steel plate are butted against each other to form the cylindrical portion 104. Work and fixing work during welding are complicated.

In consideration of the above facts, an object of the present invention is to provide a vibration damping device having a bracket having sufficient strength and which does not complicate welding work.

[0009]

According to the present invention, an inner cylinder connected to either one of a vibration generating portion and a vibration receiving portion, and a long plate material is formed by bending the longitudinal direction into a cylindrical shape. Any one of a vibration generating part and a vibration receiving part, which has a split opening formed by abutting one end and the other end and which holds an elastic body for vibration absorption connected to the inner cylinder inward The tube having a first side surface connected to the other side and parallel to the axial direction of the tubular portion, and a second side surface that is perpendicular to the axial direction and is provided continuously to the axial end portion of the first side surface. A vibration isolator, comprising: a mounting portion welded to an outer peripheral surface of the portion, wherein the shape of the split opening is uneven in the circumferential direction of the tubular portion.

[0010]

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, the split portion of the tubular portion is formed in a concavo-convex shape in the circumferential direction of the tubular portion, that is, the long plate member forming the tubular portion has a convex portion at one end in the longitudinal direction and other portions. A split opening is formed by engaging with the recessed portion at the end. Therefore, when forming the tubular portion, the one end and the other end do not shift in the axial direction to form a step on the axial end surface of the tubular portion, and the axial end surface is flat without any complicated positioning work. The split can be welded as.

The mounting portion may be welded to any position as long as it is the outer peripheral surface of the tubular portion. For example, the split portion of the tubular portion is welded independently and the mounting portion is welded to a portion other than the split portion. You may
The mounting portion may be welded by disposing the second side surface so as to straddle the split portion, or the mounting portion may be welded by disposing the first side surface so as to straddle the recessed and recessed slit portion in the axial direction. You may.

In particular, when the mounting portion is welded by disposing the second side surface so as to straddle the split opening, and the first side surface is disposed so as to straddle the recessed and recessed split opening in the axial direction. When the mounting portion is welded, the welding of the split opening and the welding of the mounting portion can be performed at the same time, and the welding process can be shortened.

Further, for example, by forming zigzag or meandering split openings so as to have a plurality of irregularities, and performing linear welding along the longitudinal centerline of the split openings,
Since the split mouth is spot-welded at multiple points, the welding strength can be improved. In addition, if the split opening is zigzag or meandering, the split opening can be reliably spot-welded at a plurality of points even if some errors occur at the welding site.

[0015]

【Example】

[First Embodiment] A first embodiment of the present invention is shown in FIG.
A description will be given according to (B).

As shown in FIG. 1A, the vibration isolator 10 of this embodiment is provided with a bracket 12. The bracket 12 includes a cylindrical portion 14 and a mounting arm 1 as a mounting portion.
6 and 6.

The cylindrical portion 14 is formed by bending a steel plate into a cylindrical shape and has a split opening 18. This split 18
Is a convex portion 14A formed in the central portion in the axial direction (arrow A direction) of one end portion in the circumferential direction, and a concave portion 14B formed in the central portion in the axial direction of the other end portion in the circumferential direction and fitted to the convex portion. It is formed by fitting. This convex portion 14A has a rectangular shape.

The mounting arm 16 has a split opening 18 in the cylindrical portion 14.
Is disposed outside the. The mounting arm 16 is formed by pressing a steel plate, and the mounting arm 16 includes a mounting surface 20 as a first side surface that is parallel to the axis of the cylindrical portion 14. Extend 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.

On both sides of the mounting surface 20 in the width direction, the mounting surface 20
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
It is in close contact with the outer peripheral surface of No. 4.

The mounting surface 20 has an axial dimension longer than the axial dimension of the convex portion 14A, and is disposed so as to straddle the vicinity of the tip of the convex portion 14A in the axial direction. It is arranged so as to straddle the portions along the axial line on both axial sides of the convex portion 14A of the mouth 18, and the attachment surface 20 and the outer side of the reinforcing wall 24 are welded 30 to the cylindrical portion 14 so as to be fixed to each other. . In this embodiment, the welding 30
Is on the outside of the mounting surface 20 and the reinforcing wall 24, but may be on the inside or on both sides.

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, since the split opening 18 is uneven, one end and the other end of the steel plate are axially displaced when the cylindrical portion 14 is formed. There is no step on the axial end face, and the axial end face is flattened without complicated positioning work.
Can be welded.

Further, the bracket 12 is the mounting arm 1
6 crosses the split opening 18 at four places (arrow B part), so it is possible to use only the conventional two places (Fig. 5).
The diameter expansion strength of the cylindrical portion 14 is higher than that of the bracket of (see).

[Second Embodiment] A second embodiment of the present invention is shown in FIG.
A description will be given according to (A) and (B). The same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The shape of the convex portion 14A of the vibration isolator 10 of this embodiment is different from the shape of the convex portion 14A of the first embodiment,
As shown in FIG. 2 (A), the convex portion 14A is wider on the front end side in the axial direction than on the base portion side, and the reinforcing wall 24 has a total of 4 on both sides of the convex portion 14A on the axial side. While straddling the location, each straddle straddles the portions along the axial lines on both axial sides of the convex portion 14A of the split opening 18 (see FIG. 2B). Therefore, in this embodiment, there are more welded portions (arrow B portion) of the split opening 18 than in the first embodiment, and the strength of the cylindrical portion 14 is further increased.

Further, in this embodiment, the wide tip end of the convex portion 14A is caught on the narrow opening side of the concave portion 14B, so that the expanding force of the cylindrical portion 14 is shared by the splitting opening 18, so that the cylindrical portion 14 is covered. The diametrical expansion strength is higher than that of the first embodiment.

[Third Embodiment] FIG. 3 shows a third 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.

FIG. 3 shows only the cylindrical portion 14 of the vibration isolator 10 of this embodiment. As shown in FIG. 3, the split opening 18 of the cylindrical portion 14 of the present embodiment has a zigzag shape in the axial direction. Therefore, when the welding 30 is performed along the axial direction, a slight deviation or a slight deviation occurs. Even if it bends, spot welding is always performed at multiple points, so there is no risk of insufficient welding. The welding 30 may be performed in a zigzag shape along the split opening 18, and in this case, the strength is further increased. In addition,
In this embodiment, the mounting arm 16 may be welded so as to straddle the split opening 18, or may be welded so as not to straddle it.

[Fourth Embodiment] FIG. 4 shows a fourth 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.

As shown in FIG. 4, the cylindrical portion 14 of the present embodiment.
The convex portion 14A is wider in the axial direction than the convex portion 14A of the first embodiment, and the reinforcing wall 24 is disposed slightly inside the side portion on the axial side of the convex portion 14A. The portion on the axial direction side of the portion 14A and the reinforcing wall 24 are welded 30 at the same time. In the case of the cylindrical portion 14 of the present embodiment, since the split port 18 is linearly welded, the split port 18 is spot welded to the cylindrical portion 14.
Expanding strength is high compared to.

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 is needless to say that the liquid-filled bush type vibration damping device main body may be attached.
An elastic body may be directly vulcanized and adhered to the inner circumference of the.

[0033]

As described above, since the vibration isolator of the present invention has the above-mentioned structure, it has the excellent effect that the bracket has sufficient strength and the welding operation does not become complicated.

[Brief description of drawings]

1A is a perspective view showing a vibration isolator according to a first embodiment of the present invention, and FIG. 1B is a side view of the vibration isolator of FIG. 1A as viewed from a mounting arm side. Is.

2A is a perspective view showing a vibration isolator according to a second embodiment of the present invention, and FIG. 2B is a side view of the vibration isolator of FIG. 2A viewed from the mounting arm side. Is.

FIG. 3 is a perspective view of a cylindrical portion of a vibration control device according to a third embodiment of the present invention.

FIG. 4 is a side view of a vibration isolation device according to a fourth embodiment of the present invention.

FIG. 5 is a perspective view showing a vibration isolator according to a conventional example.

[Explanation of symbols]

 10 Vibration Isolator 14 Cylindrical Part (Cylinder 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 (Vibration Absorption Elasticity) Body) 40 Mounting plate (mounting part)

Claims (1)

[Claims] 1. An inner cylinder connected to either one of a vibration generating part and a vibration receiving part, and a long plate member formed by bending the longitudinal direction of the long plate material into a cylindrical shape, and having one end and the other end in the circumferential direction. A tubular portion having a split port formed by butting and holding the vibration absorbing elastic body connected to the inner cylinder inward, and the tubular portion connected to the other one of the vibration generating portion and the vibration receiving portion. A first side surface parallel to the axial direction of the first side surface and a second side surface that is perpendicular to the axial direction and is provided continuously to the axial end portion of the first side surface.
A vibration-damping device comprising: a mounting portion having a side surface and welded to an outer peripheral surface of the tubular portion, wherein the shape of the split opening is uneven in the circumferential direction of the tubular portion. Anti-vibration device.