JPH1019073A - Rubber vibration isolator and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To weld an attaching member to a rubber vibration isolator without any thermal effect. SOLUTION: A cylindrical bush 1 is constituted of an outer cylinder 2, an inner cylinder 3 and a vibrationproof rubber 4, and an attaching seat 5 is outwardly projected and provided on the outer periphery of the outer cylinder 2. The attaching seat 5 is constituted of two-staged circular stage parts 6, 7, the end surface 11 of a pipe-like attaching member 10 is brought in contact with it, and a part subjected to welding as the outer periphery of the contact part for the end surface 11 and the circular stage part 6 is welded by laser beams over the whole circumference.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration rubber device suitable for use in a cylindrical bush or an engine mount provided on a suspension portion of an automobile, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Cylindrical bushes provided on a suspension portion of a motor vehicle are known. For example, a rigid outer member, a rigid inner member disposed inside the outer member, and these outer and inner members are connected to each other. It is provided with an anti-vibration rubber and is pressed into an eyepiece provided at one end of the suspension arm.

Further, there is a type in which a bracket formed by press-forming a plate-shaped member is welded to an outer member, and the bracket is bolted to a vehicle body or the like.

[0004]

In the case of the type in which the main body is press-fitted, the characteristic change of the vibration isolating rubber occurs due to the reduction of the diameter of the outer member, and it is difficult to control this. Was desired.

When the bracket is welded, the vibration isolating rubber is thermally deformed at the time of welding when the welding is performed after the main body is assembled. Therefore, the bracket must be welded to the outer member before the baking of the vibration isolating rubber. However, in this case, the mold structure for vulcanization molding tends to be extremely complicated,
It has become expensive.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a rigid outer member, a rigid inner member disposed inside the outer member, and a vibration isolator coupled to the outer member and the inner member. After assembling the main body including the rubber, the mounting member is laser or electron beam welded to at least one of the outer member and the inner member.

[0007]

According to the laser or electron beam welding, only the focused small area is fused, so that even after welding after assembling the main body, thermal deformation of the vibration isolating rubber can be prevented.

[0008] Therefore, welding after the assembly of the main body becomes possible, and vulcanization molding of the main body can be facilitated and the cost can be reduced.

In addition, since no press-fitting is required, there is no change in characteristics at the time of attachment to the attachment member.

[0010]

1 and 2 show an example in which a cylindrical bush 1 is directly mounted on one end of an arm-shaped mounting member 10, FIG. 1 is a process diagram thereof, and FIG. 2 is a sectional view taken along line 2-2. FIG.

The cylindrical bush 1 includes an iron-made cylindrical outer member 2, an iron inner member 3 disposed inside the outer member 2, and an anti-vibration rubber 4 connected to the outer member 2 and the inner member 3. And a mounting seat 5 is formed on the outer peripheral portion of the outer member 2.

The mounting seat 5 is composed of large and small circular steps 6, 7 which are concentrically overlapped in two steps and project sideways. Such a mounting seat 5 can be easily obtained by forging or casting the outer member 2.

The mounting member 10 is formed of a pipe member, the outer diameter of which is substantially equal to the outer diameter of the larger circular step 6, and the end face 11 of which is cut off and abuts against the surface of the circular step 6.

The inner diameter of the mounting member 10 is substantially equal to the outer diameter of the smaller circular step 7, and the circular step 7 can be fitted into the inner space of the mounting member 10.

That is, the difference between the outer diameters of the circular steps 6 and 7 is substantially equal to the thickness of the end surface 11 of the mounting member 10.

When the end face 11 of the mounting member 10 is pressed against the mounting seat 5 as shown in FIG. 1A, the circular step 7 is fitted into the inner space of the mounting member 10 as shown in FIG. The end face 11 abuts on the circular step 6 at the same time.

As a result, the outer periphery of the contact portion between the end face 11 and the circular step portion 6 becomes the welding target portion 12, and the welding target portion 12 is formed at a place protruding laterally from the outer periphery of the outer member 2. .

Therefore, the torch 13 for irradiating a laser beam is focused from just above the welding target portion 12 in a direction perpendicular to the axis of the mounting member 10, and the outer member 2
And the mounting member 10 are integrated by welding.

At this time, the laser welding fuses only a focused small area, so that the vibration-insulating rubber 4 does not have a thermal effect at a level that causes a problem in performance, and its thermal deformation does not occur. Can be prevented.

Therefore, since the mounting member 10 can be welded after the cylindrical bush 1 is assembled, the cylindrical bush 1 can be vulcanized and formed by itself, and the mold structure can be simplified.

Further, since there is no need to press-fit as in the prior art, there is no change in characteristics when the mounting member is mounted, and members such as the eyepiece on the press-fit side can be omitted.

In addition, the presence of the mounting seat 5 protruding to the outer periphery of the outer member 2 ensures that there is no obstacle to irradiation of the welding target portion 12 even when a laser beam having a straight line is used. Welding becomes possible. Moreover, the outer member 2 and the mounting member 10 are
Accurate and quick positioning before welding with

FIG. 3 is a view corresponding to FIG. 2 in a modified example in which the mounting seat 5 is a concave portion 8, and a wall surrounding the concave space is an outwardly open tapered surface 9.

On the other hand, the end surface 11 of the mounting member 10 is a tapered surface 14 corresponding to the tapered surface 9 so as to fit into the recess 8.

Therefore, the end surface 11 of the mounting member 10 is
The two tapered surfaces 9 and 14 are fitted together, and the outer periphery of the abutting portion is irradiated with a laser beam at the same inclination angle as those of the tapered surfaces, and is welded all around.

In this way, the welding operation can be performed by inclining the angle of the torch 13 with respect to the axis of the mounting member 10.

Moreover, if two to-be-welded articles are symmetrically arranged with one torch 13 interposed therebetween, the two can be welded simultaneously while swinging the torch 13 to the left and right, so that work can be performed efficiently.

The concave portion 8 may be formed directly on the outer peripheral surface of the outer member 2 instead of the convex portion as shown in the figure.

FIG. 4 shows an example in which the outer member 2 is attached to a plate-shaped attachment member 20.
A mounting hole 21 having an inner diameter substantially equal to the outer diameter of the hole is formed, and the periphery of this hole is formed as a flange 22.

Therefore, the cylindrical bush 1 is inserted into the mounting hole 21.
Are fitted together, and the entire periphery of the flange 22 is welded by lap welding with a laser, whereby the flange 22 and the outer member 2 are welded, and a similar effect can be obtained in that no thermal influence is exerted on rubber.

FIG. 5 shows an example in which a pipe-shaped mounting member 30 having an inner diameter substantially equal to the outer diameter of the outer member 2 is welded at the end face of the outer member 2. In this case, it can replace conventional roll caulking.

FIG. 6 shows an example in which a nut 40 is used as a mounting member. In addition, it can also be a bolt.

FIG. 7 shows an example in which a connecting rod 50 as an attachment member is used for the inner member 3.
Reference numeral 0 denotes a round bar having an outer diameter substantially equal to the inner diameter of the inner member 3, and the outer periphery of the axially extending portion 3a of the inner member 3 is lap welded all around.

FIGS. 8 and 9 show an example in which a bracket 60 is used as a mounting member. The bracket 60 is formed by press-molding a plate-like member. A curved portion 61 is provided along the outer periphery of the outer member 2 at an intermediate portion, and a through hole 62 used for bolting to a vehicle body or the like is formed at an end portion. It is.

The curved portion 61 of the bracket 60 is applied to the outer periphery of the outer member 2 and laser-welded in the axial direction in the manner of lap welding. The cross section of the welding line 63 schematically shown in the figure shows a state in which the tip of the welding line 63 does not reach the vibration isolating rubber 4. Such a temperature on the vibration isolating rubber 4 side from the tip of the welding line 63 can be neglected in terms of a thermal effect on the vibration isolating rubber 4. Further, the depth of the tip of the welding line 63 can be freely adjusted.

FIG. 9 is a view taken along the arrow X in FIG. Density (interval and number) of this welding line 63
Can be set arbitrarily, but the formation of a plurality of pieces is preferable in view of the heat capacity characteristic of laser welding.

The focal point of the laser beam at this time can be arbitrarily adjusted to the plus (+) side or the minus (-) side with respect to the irradiation surface, but the tip of the welded portion does not reach the vibration isolating rubber 4. Adjust as follows.

FIG. 10 shows the product of FIG. 8 in which a vibration damping member 70 is further attached to the outer periphery of the outer member 2. The damping member 70 includes a mass member 71, a damper rubber 72, and a mounting bracket 73, and the mounting bracket 73 is similarly laser-welded.

FIG. 11 shows a product obtained by welding a nut 40 to the product shown in FIG. 8 in the same manner as in FIG. 6. In this case, laser welding is easily performed using a flange 41.

FIG. 12 shows an example in which the present invention is applied to the manufacture of a liquid-tight engine mount 80. In this case, the flange 82 of the outer tube fitting 81 and the flange 84 of the lower mounting member 83 are overlapped, and the entire periphery is welded by the torch 13 as laser welding. The tube fitting 81 and the lower mounting bracket 83 are connected.

This makes it possible to replace the conventional manufacturing method in which the flanges 82 and 84 are conventionally connected by caulking.

Reference numeral 85 denotes an upper mounting bracket, 86 denotes an anti-vibration rubber, 87 denotes a partition plate, 88 denotes an orifice, and 89 denotes a diaphragm.

The present invention is not limited to these examples, but can be variously modified, for example, it can be replaced by electron beam welding. Further, a vibration-proof rubber device such as an engine-side mount may be used.

Further, as an example of the laser welding conditions in the above-mentioned lap welding type, there is the following. Material and thickness of outer member SPC plate pressure 2.3mm Material and thickness of mounting member SPC plate pressure 2.6mm Laser type CO2 laser (MD laser) Output 2.2KW Feeding speed 1.0m / min Shield gas Ar gas (20 l / min) Depth of focus 0

[Brief description of the drawings]

Fig. 1 Diagram of mounting process of cylindrical bush

FIG. 2 is a sectional view taken along line 2-2 of FIG. 1;

FIG. 3 is a diagram corresponding to FIG. 2 in a modified example.

FIG. 4 is a cross-sectional view when a plate-shaped mounting member is mounted.

FIG. 5 is a cross-sectional view when a pipe-shaped mounting member is mounted.

FIG. 6 is a sectional view when a nut is used as a mounting member.

FIG. 7 is a sectional view when a connecting rod is used as an attachment member.

FIG. 8 is a cross-sectional view when a bracket is used as a mounting member.

9 is a view as viewed from the direction of the arrow X in FIG. 8;

FIG. 10 is a sectional view when a bracket and a vibration damping member are used as attachment members.

FIG. 11 is a sectional view when a bracket and a nut are used as mounting members.

FIG. 12 is a cross-sectional view when applied to the manufacture of a liquid ring engine mount.

[Explanation of symbols]

1: cylindrical bush, 2: outer member, 3: inner member, 4:
Anti-vibration rubber, 5: mounting seat, 6: circular step, 7: circular step,
10: mounting member, 11: end face, 12: welding target part, 1
3: Torch, 20: plate-shaped mounting member, 30: pipe-shaped mounting member, 40: nut, 50: connecting rod, 60: bracket, 70: damping member, 80: liquid seal engine mount

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshifumi Yamamoto 1239 Kamekubo Oimachi, Iruma-gun, Saitama Prefecture Yamashita Rubber Co., Ltd.

Claims (10)

[Claims] A main body including a rigid outer member, a rigid inner member disposed inside the rigid outer member, and a vibration-proof rubber coupled to the outer member and the inner member; An anti-vibration rubber device comprising: a mounting member attached to at least one of the sides; wherein the mounting member is laser or electron beam welded to the main body side. 2. The rubber vibration isolator according to claim 1, wherein the main body is a cylindrical bush having a cylindrical outer member and an inner member. 3. An anti-vibration rubber device according to claim 2, wherein the mounting member has a mounting hole having an inner diameter substantially equal to the outer diameter of the outer member. 4. An anti-vibration rubber device according to claim 1, wherein the mounting member has an arm shape and one end thereof is directly welded to the main body. 5. An anti-vibration rubber device according to claim 4, wherein an end face of said mounting member is in contact with an uneven portion formed on a side portion of the main body. 6. An anti-vibration rubber device according to claim 1, wherein said mounting member is a bracket formed by press-forming a plate-like member. 7. An anti-vibration rubber device according to claim 6, wherein said mounting member is overlap-welded to the main body and a plurality of welding lines are formed. 8. An anti-vibration rubber device according to claim 1, wherein the mounting member is a nut or a bolt. 9. An anti-vibration rubber device according to claim 1, wherein the mounting member is a mass member. 10. A body is assembled by disposing a rigid inner member inside a rigid outer member, and interposing an anti-vibration rubber between the outer member and the inner member. A laser or electron beam welding of the mounting member to at least either side of the method.