JPH06155021A - Manufacture of vibration proof device - Google Patents

Abstract

PURPOSE:To provide a method for manufacturing a vibration proof device by which sufficient strength is imparted to a cylindrical member and the vibration proof device is efficiently manufactured. CONSTITUTION:A cylindrical part 14 is formed by bending/forming a steel plate into a cylindrical shape and the butted part 18 is joined by welding 26 from the outside by inert-gas arc welding. After that, a mounting arm is welded on the outer peripheral part astride the weld 26. Since the butted part 18 is welded at high strength by inert-gas arc welding, sufficient strength is imparted to the cylindrical part 14. Since the removing work of slag and residual flux after welding in common arc welding is unnecessary in inert-gas arc welding and spatter is hardly generated, the post-work after welding is drastically shortened and the vibration proof device is efficiently manufactured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing an anti-vibration device for absorbing and attenuating vibration from a vibration generating part used in automobiles and general industrial machines, and more particularly, a metal plate is rolled into a tubular shape. The present invention relates to a method for manufacturing a vibration damping device including a tubular member for mounting formed as described above.

[0002]

2. Description of the Related Art An automobile is provided with an anti-vibration device which absorbs and damps engine vibrations between an engine and a vehicle body. Among these vibration damping devices, the bush type vibration damping device is used by being press-fitted and held in the tubular member of the bracket,
This vibration isolator is attached to the vehicle body via a bracket.

As shown in FIG. 4, a vibration isolator bracket 100, which is conventionally formed of a metal plate, has a cylindrical portion 104 into which a vibration isolator main body 102 is press-fitted and held, and an attachment for attachment to a vehicle body. The mounting arm 106 and the cylindrical portion 104 are connected by welding 108.

[0004]

By the way, in this bracket 100, the abutting portion 110 of the cylindrical portion 104 is two.
Since it is welded only at the points (the portion where the mounting arm 106 straddles), there is a problem in terms of strength, that is, when the plate thickness is reduced to reduce the weight, the butt portion 110 opens at a portion other than the welding 108. There is an anti-vibration device body 10
The holding power of 2 may decrease.

Therefore, by the welding robot, the abutting portion 11 of the cylindrical portion 104 is welded after the mounting arm 106 is welded.
0 is arc welded and joined, but the abutting portion 11
When 0 is welded, the portion straddled by the mounting arm 106 cannot be welded, and therefore sufficient strength cannot be achieved.

Further, since it takes time to set the bracket 100 on a jig for a welding robot and to align the bracket, the cost is significantly increased.

Further, since a large amount of spatter scatters in arc welding, spatter may stick to the inner surface of the cylindrical portion 104 when welding the ends of the butted portions 110,
Sputter removal work is required. Furthermore, the slag in the welded portion must be removed by hitting it with a hammer or the like, which not only complicates the slag removal work, but also the cylindrical portion 10
There is a possibility that 4 will be deformed.

In view of the above facts, the present invention has an object to obtain a method for manufacturing a vibration isolator, which allows the tubular member to have sufficient strength and can efficiently manufacture the vibration isolator. is there.

[0009]

SUMMARY OF THE INVENTION The present invention is directed to an inner cylinder connected to either one of a vibration generator and a vibration receiver, an outer cylinder connected to the other one of a vibration generator and a vibration receiver, and A vibration-isolating body provided between the inner cylinder and the outer cylinder and having an elastic body that deforms when vibration occurs, and a predetermined metal plate are rolled into a tubular shape, and the vibration-isolating body is press-fitted inward. A method for manufacturing an anti-vibration device, comprising: a tubular member for holding; and a mounting member that is welded to the outer peripheral surface of the tubular member across the butted portion of the tubular member, the butted portion Are joined by inert gas arc welding or laser welding.

[0010]

In the present invention, the abutting portions of the tubular members are joined by inert gas arc welding or laser welding. Therefore, unlike conventional arc welding, the welded portion is not convex and is smooth, and spatter is not generated. Almost never.
Therefore, the lower surface of the mounting member can be continuously welded before welding the mounting member, and the abutting portion of the tubular member can be bonded with high strength.

Further, unlike conventional arc welding, slag removal work is not required and spatter is hardly generated. Therefore, the work after welding is greatly shortened and the vibration isolator can be efficiently manufactured. .

[0012]

【Example】

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

As shown in FIG. 2, a vibration isolator 1 of this embodiment.
A bracket 12 is provided at 0. The bracket 12 is formed of a cylindrical portion 14 as a tubular member and a mounting arm 16 as a mounting member.

The cylindrical portion 14 is formed by bending a steel plate into a cylindrical shape, and the outer side of the abutting portion 18 along the axial direction is inert-gas arc welding.
) Are welded 26 and joined. It should be noted that both ends of the abutting portion 18 are preferably welded over the entire width except for a slight length (about 3 mm or less).

In this inert gas arc welding, a tungsten rod 19 is used as an electrode as shown in FIG. Dissolve.

As shown in FIG. 2, the cross section of the weld 26 formed by inert gas arc welding has a slight concave shape, does not have a convex shape as in conventional arc welding, and has a smooth surface.

TIG welding is preferable as the inert gas arc welding. In general arc welding or gas welding, it is necessary to use flux, but in inert gas arc welding, since welding is performed in the atmosphere of inert gas, there is no need for flux, and to remove slag and residual flux after welding. No mechanical or chemical treatment of is required. Further, the inert gas arc welded portion is superior in ductility, strength, airtightness and corrosion resistance to other arc welded or gas welded welded portions.

The ratio d / t between the welding depth d and the thickness t of the steel plate of the cylindrical portion 14 is preferably in the range of 0.5 to 0.9, and the thickness t of the steel plate is not affected. It is preferable that the welding depth d is at least 1.6 mm. here,
If d / t is less than 0.5, the welding strength is insufficient,
If d / t exceeds 0.9 and the entire thickness is welded, it may rise to the inner surface, which is not preferable. Further, even when the welding depth d is less than 1.6 mm, the welding strength becomes insufficient, which is not preferable.

As shown in FIG. 2, the mounting arm 16 is formed by pressing a steel plate. The mounting arm 16 includes a mounting surface 20 that is parallel to the axis of the cylindrical portion 14, and the mounting surface 20 extends to the outside of the cylindrical portion 14. In the vicinity of the center of the mounting surface 20, a bolt hole 22 for mounting the bracket 12 to either one of the vibration generating portion and the vibration receiving portion (the vehicle body of an automobile as an example).
Are formed.

On both sides of the mounting surface 20 in the width direction, the mounting surface 20
A reinforcing wall 24 that is bent perpendicularly to is provided in parallel with. The height of the reinforcing wall 24 is gradually reduced as it goes away from the cylindrical portion 14. In addition, the reinforcing wall 24
The cylindrical portion 14 side is an arcuate portion 24A that matches the curvature of the outer peripheral surface of the cylindrical portion 14, and is in close contact with the outer peripheral surface of the cylindrical portion 14.

The mounting arm 16 and the cylindrical portion 14 are fixed to each other by welding the circular arc portion 24A to the outer circumference of the cylindrical portion 14 by welding 30. In this example,
The weld 30 is on one side of the reinforcing wall 24, but may be on both sides. The welding 30 may be general arc welding or inert gas arc welding.

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, and the outer cylinder 3
An inner cylinder 36 is disposed inward of 4 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). An elastic body 38 is stretched between the outer cylinder 34 and the inner cylinder 36. The elastic body 38 is 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. There is.

Next, the operation of this embodiment will be described.
In the vibration isolator 10 of the present embodiment, the butting portion 18 is joined with high strength by the inert gas arc welding before welding the mounting arm 16, so that the cylindrical portion 14 can have sufficient strength.

Further, as described above, the inert gas arc welding does not require the work of removing the slag and the residual flux after welding, unlike the general arc welding, and it hardly generates spatter unlike the conventional arc welding. The post-work after welding is significantly shortened, and the vibration isolator can be efficiently manufactured at low cost.

[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.

As shown in FIG. 3, the cylindrical portion 14 of the present embodiment.
The butt portion 18 of the
have been welded).

In this laser welding, the laser beam 4
Irradiate 0 while moving it along the abutting portion 18. The cylindrical portion 14 is joined by melting the base materials on both sides of the abutting portion 18 by the heat of the laser beam 40. At the time of welding, it is preferable to inject an inert gas into the welded portion to block the welded portion from air (oxygen) in order to prevent oxidation.

Also in the case of the present embodiment, similarly to the first embodiment, since it is possible to perform welding only by the heat of the laser beam without using a welding rod, the welded portion does not rise. In addition, there is almost no generation of spatter, and there is no need for flux as in inert gas arc welding.

Further, in the present embodiment, the bracket 12
The outer cylinder 34, the inner cylinder 36, and the elastic body 38 are provided in the cylindrical portion 14 of
Although the example in which the anti-vibration device body 32 made of is attached by pressing is shown, the present invention is not limited to this, and the anti-vibration device body 32 is not limited to this.
Instead of this, it is of course possible to attach a bush type vibration damping device body having another configuration, for example, a well-known liquid-filled bush type vibration damping device body in which liquid is sealed inside.

[0030]

As described above, since the method for manufacturing the vibration isolator of the present invention employs the method of joining the abutting portions of the tubular members by inert gas arc welding or laser welding, the tubular members have sufficient strength. It has an excellent effect that the vibration damping device can be manufactured efficiently.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a vibration damping device according to a first embodiment.

FIG. 2 is a cross-sectional view of essential parts showing a joined state of a butting portion of a cylindrical member of the vibration isolator according to the first embodiment by inert gas arc welding.

FIG. 3 is a perspective view of essential parts showing a joining state of a butting portion of a cylindrical member of a vibration isolator according to a second embodiment by laser welding.

FIG. 4 is a perspective view showing a vibration isolator according to a conventional example.

[Explanation of symbols]

 10 Vibration Isolator 14 Cylindrical Part (Cylindrical Member) 16 Mounting Arm (Mounting Member) 18 Butt Part 32 Vibration Isolator Main Body (Vibration Isolation Main Body) 34 Outer Cylinder 36 Inner Cylinder 38 Elastic Body

Claims (1)

[Claims] 1. An inner cylinder connected to either one of the vibration generator and the vibration receiver, an outer cylinder connected to the other one of the vibration generator and the vibration receiver, and the inner cylinder and the outer cylinder. An anti-vibration body which is provided between the elastic body and is deformed when vibration occurs, and a tubular member for winding a predetermined metal plate into a tubular shape, and press-fitting and holding the anti-vibration body inward. A method of manufacturing a vibration isolator, comprising: a mounting member that is welded to the outer peripheral surface of the tubular member across the abutting portion of the tubular member, wherein the abutting portion is formed by inert gas arc welding or laser welding. A method for manufacturing an anti-vibration device, which comprises bonding.