JP2002321125A - Method and jig for press-fitting elastic bush - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a jig by which an elastic bush can be press- fitted into a mounting hole by pushing the elastic bush from an end portion side of a flange of an outer tube without producing bending deformation of the flange of the outer tube and cracks and the like on a stopper rubber portion provided on an external surface of the flange. SOLUTION: When the elastic bush A, in which an inner tube 1 and an outer tube 2 having a flange 21 formed by folding it outward at one end of its length are combined via a rubber elastic body 3 and a stopper rubber portion 4 is provided at an axially outside surface of the flange 21, is press-fitted into the mounting hole 32, the press-fitting operation is carried out using the press-fitting jig 10, which has a pushing surface portion 12 for pushing an inner end area (a) approximately corresponding to an area on the extended portion of a tube thickness at a flange side end 5 of the outer tube 2 and a tapered surface 13 formed outside the pushing surface portion 12 so as to be connected to the pushing surface portion 12 and to increase its diameter in proportion to the distance toward the rear side, without directly applying a pushing force on an area outside the inner end area (a).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a jig for press-fitting an elastic bush into a mounting hole mainly used in a suspension of an automobile.

[0002]

2. Description of the Related Art Conventionally, in the suspension of an automobile, a member such as a bracket on the vehicle body and a member such as a suspension arm between a vehicle body and a member on the suspension side for supporting the same are used. An elastic bush in which an inner cylinder (51) and an outer cylinder (52) are connected via a rubber elastic body (53) interposed between the two cylinders, as shown in FIG. Is used.

The elastic bush is press-fitted and fixed in a mounting hole (32) of the outer cylinder (52) of the member (31).
A shaft member (35) such as a connection rod or a bolt on the vehicle body side is inserted and connected to the inner cylinder (51) inside the bush. At this time, the inner cylinder (51) formed slightly longer in the axial direction than the outer cylinder (52) is positioned so as to be sandwiched between the pair of brackets (36) (36), and the outer cylinder (52) is It is supported so that it can be slightly displaced in the axial direction with respect to (51). Therefore, in order to reduce the contact impact on the bracket (36) when the outer cylinder (52) is displaced in the axial direction, the outer cylinder (52)
A stopper rubber portion (54) integral with the rubber elastic body (53) is attached to the outer surface of the flange (52a) provided at one end of the stopper.

In order to press-fit the elastic bush into a mounting hole (32) of a member (31) or the like,
A member member (31) having a mounting hole (32) is fixed at a predetermined position, and the opening end of the mounting hole (32) has an end opposite to the flange (52a) side of the outer cylinder (52). Then, the side of the flange side end (55) is pressed from above the rubber portion (54) by a predetermined press-fitting jig (60) and press-fitted.

At the time of this press-fitting, a conventional press-fitting jig (60)
As shown in FIG. 6, the pressing die (61) presses the flange-side end (55) of the outer cylinder (52) over substantially the entire surface thereof from above the stopper rubber portion (54). ing. Therefore, the flange (52a) of the outer cylinder (52) may be bent and deformed so as to be warped outward.

In particular, in recent years, the outer cylinder (52) and the like are often made of aluminum material, and even in this case, the thickness is not so large from the viewpoint of cost, so that the flange (52) is not used.
The rigidity of a) is low. When the entire surface of the stopper rubber portion (54) is pressed from the outer surface of the flange (52a) as described above, the flange (52a) is pressed via the rubber portion (54) and warps as shown in FIG. When you turn for it. If this deformation continues, the state of attachment to the shaft member (35) will be unstable, and there will be problems with the stopper action and the cushioning action.

[0007] The present invention has been made in view of the above,
The purpose is that, when the elastic bush is pressed into the mounting hole, even if the flange side end of the outer cylinder is pressed from above the rubber portion for the stopper, the flange of the outer cylinder does not bend and deform. Further, it is an object of the present invention to provide a press-fitting method capable of press-fitting the stopper rubber portion without generating a crack or the like, and a press-fitting jig used for the press-fitting method.

[0008]

SUMMARY OF THE INVENTION The present invention, which solves the above-mentioned problems, relates to a method of press-fitting an elastic bush, and comprises an inner cylinder and an axially bent one end arranged axially concentric with the inner cylinder. An outer cylinder having a formed flange is joined by a rubber elastic body interposed between the two cylinders, and an elastic bush having a stopper rubber portion attached to an axially outer surface of the flange is pressed into a press-fitting jig. When press-fitting into the mounting hole by pressing with a tool, the thickness of the cylindrical portion at the flange-side end of the outer cylinder is increased by a press-fitting jig having an inclined surface continuously outside the pressing surface portion. It is characterized in that an inner end region substantially corresponding to the extension is pressed.

According to the press-fitting method of the present invention, the inner end region substantially corresponding to the extension of the thickness of the cylindrical portion at the flange-side end of the outer cylinder is formed so that the inclined surface is continuously formed outside the pressing surface portion. Since the pressing is performed by the formed press-fitting jig, the pressing force does not strongly act on the flange of the outer cylinder, so that the press-fitting can be performed without causing the flange to bend and deform.

A second aspect of the present invention relates to a press-fitting jig used in the above-mentioned press-fitting method, wherein a press-type portion for pressing the flange-side end of the outer cylinder is provided at the flange-side end. An inclined surface in a retreating direction from the pressing surface portion is formed outside and outside the pressing surface portion that presses the inner end region substantially corresponding to the extension of the thickness of the cylindrical portion.

By using this press-fitting jig, the inner end region at the flange-side end of the outer cylinder can be pressed, and the pressing force can be pressed by the inclined surface outside the region. Therefore, it is not strongly pressed through the rubber part at the outer flange part,
Therefore, there is no possibility that bending deformation occurs in the flange. Moreover, since the inclined surface is formed continuously from the pressing surface portion, the degree of compression of the stopper rubber portion due to the pressing gradually changes. It can be pressed without damaging it and can be pressed in.

[0012] In particular, in the pressing die portion, when the inclined surface outside the pressing surface portion pressing the inner end region is more continuous than the pressing surface portion with a curved surface, the pressing surface portion and the inclined surface may be connected to each other. Since no edge is generated between the rubber portions, there is no possibility that a crack or the like is generated in the rubber portion even when pressed as described above.

Further, in the pressing die portion, an angle formed by the inclined surface outside the pressing surface portion pressing the inner end region with respect to the pressing surface portion is set in a range of 30 ° to 60 °. Is preferred. That is, when the angle is smaller than the above, the effect of releasing the pressing force is reduced, and when the angle is larger than the above angle, the pressing force changes abruptly, so that the change in the degree of compression of the rubber portion is increased, and the cracks and the like are rather formed. May occur. Therefore, it is particularly preferable to set the above range.

[0014] In any of the above inventions, a positioning pin that can be fitted into the inner cylinder is protruded from the axis of the pressing die, and the pressing surface is provided so as to form a concentric circle with the pin. What is obtained is preferable. Thereby, at the time of press-fitting into the mounting hole, in a state where the positioning pin is fitted in the inner cylinder and positioned, the pressing surface portion does not cause eccentricity of the inner end region of the flange side end portion. It can be pressed, and can be press-fitted without causing bending deformation of the flange.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments shown in the drawings.

FIG. 1 is a longitudinal sectional view showing a state before the elastic bush (A) is press-fitted into a mounting hole of a member member of a suspension, FIG. 2 is an enlarged sectional view of a part of the same, and FIG. FIG. 4 is a vertical cross-sectional view showing a press-fit state pressed by a press-fitting jig, and FIG. 4 is an enlarged cross-sectional view of part of the same.

The elastic bush (A) to be press-fitted includes an inner cylinder (1) inserted and attached to a shaft member such as a connecting rod on the vehicle body, and a member member (31) such as a suspension.
The outer cylinder is press-fitted and fixed to the mounting hole (32) via the collar (33), and is disposed substantially concentrically outside the inner cylinder (1). The inner and outer cylinders (1) and (2) are usually made of a metal material such as aluminum or steel, and the inner cylinder (1) is formed to be slightly longer in the axial direction than the outer cylinder (2).

At one end in the axial direction of the outer cylinder (2), there is provided a flange (2a) bent outward, and the outer surface of the flange (2a) is provided with the rubber elastic body (3). An integral stopper rubber portion (4) is provided by a vulcanization bonding means.

Next, a method of press-fitting the elastic bush (A) into the mounting hole (32) of the member (31) will be described together with a press-fitting jig (10) used for this.

The press-in jig (10) is, as shown in FIG.
At the lower end thereof, there is provided a pressing part (11) for pressing the end of the outer cylinder (2) on the flange (2a) side, and it is moved up and down by a suitable vertical moving means (not shown) such as a cylinder device. It is provided to move. The pressing mold portion (11) can press an inner end region (a) substantially corresponding to an extension of the thickness of the cylindrical portion (21) at the flange-side end portion (5) of the outer cylinder (2). Having a pressing surface portion (12)
An inclined surface (1) extending from the pressing surface portion (12) in a retreating direction (upward in the figure) from the pressing surface portion (12) outwardly of the pressing surface portion (12).
3) is formed. Thus, the inner end region (a) can be pressed while gradually releasing the pressing force acting on the flange (2a) via the stopper rubber portion (4).

That is, in the press-fitting operation of the elastic bush (A), as shown in FIG. 1, the member member (31) is provided with a mounting hole (32) formed by the collar (33) on a press-fitting base. ) Is fixed with the axis centered vertically. The elastic bush (A) is supplied to the upper opening end of the mounting hole (32), and the outer cylinder (2) is set so that the end of the outer cylinder (2) on the side opposite to the flange side is aligned.
In this state, the press-fitting jig (10) disposed above is lowered by a vertical moving means such as a cylinder device, and the pressing die (11) provided at the lower end thereof causes the flange (10) of the outer cylinder (2) to move downward. The end on the 2a) side is pressed from above the stopper rubber portion (4), and the outer cylinder (2) is attached to the mounting hole (32), and the back surface of the flange (2a) is attached to the mounting hole (32). Is press-fitted to a position where it comes into contact with the end face of the collar (33) that forms.

In the case of the present invention, the above-mentioned press-fitting jig (10)
When press-fitting by pressing, the flange (2
The inner end region (a) substantially corresponding to the extension of the wall thickness of the cylindrical portion (21) at the end on the side of the (a) is moved from above the stopper rubber portion (4) by the pressing surface portion (12) formed of a horizontal plane. In addition to the pressing, the portion of the inclined surface (13) that continues outward is pressed so that the pressing force does not directly act on the flange (2a) via the rubber portion (4). Therefore, no strong pressing force acts on the flange (2a) of the outer cylinder (2) via the stopper rubber portion (4), and no bending deformation in the warping direction occurs.

The inclined surface (13) of the pressing die (11) of the press-fitting jig (10) may be a curved surface having a predetermined radius. It is preferable to perform the operation on such an inclined surface in terms of the effect of reducing the pressing force acting on the flange (2a). Further, if an edge is formed at a continuous portion between the inclined surface (13) and the pressing surface portion (12), when the stopper rubber portion (4) is pressed, a crack or the like is generated from a portion corresponding to the edge. Therefore, in practice, the pressing surface portion (12) and the inclined surface (13) are continuous with a curved surface having a very small radius, for example, a curved surface having a radius of about 1 mm as shown in the figure. Is preferred. Thereby, the occurrence of cracks in the rubber portion (4) can be prevented.

In the above, the angle (α) formed by the outer inclined surface (13) of the pressing die portion (11) with respect to the pressing surface portion (12) formed by the horizontal plane can be arbitrarily set, but is more preferably 30. The angle is set in the range of ° to 60 °.

In any of the above cases, the pressing die portion (1
A positioning pin (15) that can be fitted into the inner cylinder (1) is protruded from the shaft center of (1), and the pressing surface (12) and the inclined surface (13) are attached to the pin (15). ) Is preferably formed in a concentric circular arrangement.

That is, at the time of press-fitting, as shown in FIGS. 1 and 3, first, the pin (15) is fitted into the inner cylinder (1) by lowering the press-fitting jig (10). , Align the axis. Thus, the press-in jig (1
0) is lowered, and the end of the outer cylinder (2) on the flange (2a) side is pressed by the pressing die (11), so that the pressing surface (12) is brought into contact with the inner end region (a). Pressing can be performed accurately without eccentricity.

When the pressing jig (10) is pressed by the pressing die (11), the end surface of the inner cylinder (1), which is slightly longer than the outer cylinder (2), is pressed. Tube (1)
Can be displaced in the axial direction using the elastic deformation of the rubber elastic body (3) with respect to the outer cylinder (2) as shown in FIG.
The outer cylinder (2) can be pressed without any problem. Of course, the pressing die (1) having the pressing surface (12) and the inclined surface (13)
1) can be formed to protrude into a cylindrical shape.

[0028]

As described above, according to the method for press-fitting an elastic bush and the jig for press-fitting according to the present invention, when the elastic bush is press-fitted into the mounting hole, the thickness of the cylindrical portion at the flange side end of the outer cylinder is increased. By pressing the inner end region substantially equivalent to the extension of the thickness with a press-fitting jig having an inclined surface formed outside the pressing surface portion, a strong pressing force is applied to the flange of the outer cylinder via the rubber portion. It is possible to press-fit without causing any bending and deformation such as warpage in the flange, and press-fit without causing cracks or the like in the stopper rubber portion.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a state before an elastic bush is press-fitted into a mounting hole by pressing of a press-fitting jig.

FIG. 2 is an enlarged sectional view of a part of the above.

FIG. 3 is a longitudinal sectional view showing a press-fit state pressed by a press-fitting jig.

FIG. 4 is an enlarged sectional view of a part of the above.

FIG. 5 is a vertical cross-sectional view of a usage state of the elastic bush.

FIG. 6 is a longitudinal sectional view showing a conventional method of press-fitting an elastic bush into a mounting hole by pressing a press-fitting jig.

[Explanation of symbols]

 (A) Elastic bush (1) Inner cylinder (2) Outer cylinder (21) Flange (3) Rubber elastic body (4) Rubber part for stopper (5) Flange side end (10) Press-in jig (11) Press Mold (12) Horizontal pressing surface (13) Inclined surface (15) Positioning pin

Claims (5)

[Claims] An inner cylinder and an outer cylinder having a flange disposed concentrically with the inner cylinder and having an outwardly bent flange at one end in an axial direction,
An elastic bush, which is connected by a rubber elastic body interposed between the two cylinders and has a rubber portion for a stopper attached to an axially outer surface of the flange, is pressed into a mounting hole by a pressing jig. In doing so, the press-fitting jig having an inclined surface continuously outside the pressing surface portion allows the inner end region substantially equivalent to the extension of the thickness of the cylindrical portion at the flange side end of the outer cylinder to be increased. A method of press-fitting an elastic bush, characterized by pressing. 2. An inner cylinder, comprising: an outer cylinder concentrically disposed with the inner cylinder and having an outwardly bent flange at one axial end;
A press-fitting jig for press-fitting an elastic bush, which is connected via a rubber elastic body interposed between both cylinders and has a rubber portion for stopper on an axially outer surface of the flange, into a mounting hole. The press-type portion that presses the flange-side end of the outer cylinder is continuous with a press surface portion that presses an inner end region substantially corresponding to an extension of the thickness of the cylinder portion at the flange-side end. A jig for press-fitting an elastic bush, characterized in that an outwardly inclined surface is formed from the pressing surface portion in a retreating direction. 3. The press-fitting of the elastic bush according to claim 2, wherein in the pressing die portion, an inclined surface outside the pressing surface portion pressing the inner end region is continuous with a curved surface from the pressing surface portion. Jig. 4. In the pressing die portion, an angle formed by an inclined surface outside a pressing surface portion for pressing the inner end region with respect to the pressing surface portion is set in a range of 30 ° to 60 °. Item 4. A jig for press-fitting an elastic bush according to item 2 or 3. 5. A pin for positioning, which can be fitted into an inner cylinder, is protruded from an axis of said pressing die portion, and said pressing surface portion is provided so as to form a concentric circle with said pin.
5. The jig for press-fitting an elastic bush according to 4.