JP2000046085A - Drawing jig for bushing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the tumble of an outer cylinder flange at the time of drawing of a bushing, to improve the dimensional accuracy and attaching works, and to enhance the adhesiveness and durability. SOLUTION: A drawing jig for a bushing is composed of a first jig portion 9 provided with a hole 6 to admit insertion and hold the bushing 5 formed by arranging an inner cylinder 2, resilient member 3, and outer cylinder 4 concentrically in this adder from the inside and a taper 7 on the peripheral surface and consisting of a split body 8 divided in a plurality of segments about the axial direction of the hole 6 and a second jig portion 12 having a taper 11 on the inside surface of a hole 10 and drawing the diameter of the outer cylinder 4 by moving the split body 8 in the radial direction in cooperation with the taper 7 on the first jig 9, wherein the second jig 12 is furnished with a stopper 13 to hinder movement of the inner cylinder 2 of bushing 5 held by the first jig 9 at the time of the diameteric reduction of the outer cylinder 4. Therefore the movement of the inner cylinder 2 is suppressed in the drawing process so that the adhesiveness and durability are enhanced, and the dimensional accuracy is improved to eliminate dispersion in the attaching work. A uniform drawing is achieved if the drawing is performed in the condition that the forefront 23a of the upper flange of the outer cylinder 4 is allowed to abut on a notch 9a formed in the trunk of a drawing piece, and there is no risk that the forefront of the flange tumbles.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drawing jig for a bush used for a joint portion between a vehicle body and a suspension arm, and more particularly, to a drawing jig having a stopper. The present invention relates to a bush drawing jig for preventing movement of an inner cylinder of a bush during drawing.

[0002]

2. Description of the Related Art Bushes in which an elastic member is interposed between an inner cylinder and an outer cylinder are used for various connecting portions. For example, as shown in FIG. 3, a bush 5 used between a vehicle body and a suspension arm includes an inner cylinder 2 with a flange, an elastic member 3, and an outer cylinder 4 with a flange in this order from inside to outside. It is arranged concentrically. This bush 5
Finally, the drawing jig 12 of the drawing bushing drawing jig 50 shown in FIG. 4 is moved in the direction of the arrow A, and the divided body 8 of the drawing piece 9 divided in the axial direction is moved in the direction of the arrow B. , So that the diameter of the flanged outer cylinder 4 is 1 to 2
The diameter is reduced by about mm, and the adhesion and durability are improved.

The bush 5 after drawing as described above is used between the vehicle body and the suspension arm, and the elastic member 3 interposed between the inner cylinder 2 having a flange and the outer cylinder 4 having a flange. As a result, the ride comfort is improved and the maneuverability is stabilized.

[0004]

However, when the flanged outer cylinder 4 of the bush 5 is drawn by the bush drawing jig 50, the flanged inner cylinder 2 moves in the direction of arrow C in FIG. For this reason, the outer portion 3a of the elastic member 3 may move in the direction of the arrow D, and the flange 23 of the flanged outer cylinder 4 may fall down, that is, bend in the direction of the arrow D. Further, the flange 21 of the inner cylinder 2 with a flange and the outer cylinder 4 with a flange shown in FIG.
The dimension t of the bush 5 is disturbed when the bush 5 is assembled.

In addition, excessive tension is applied to the elastic member 3 near the flanges 21 and 23 of the inner cylinder 2 having a flange and the outer cylinder 4 having a flange. Or worst case elastic member 3
A part of the bonding portion between the inner cylinder 2 with the flange and the outer cylinder 4 with the flange may be separated. And
In the bush 5 used between the vehicle body and the suspension arm, water or mud enters the gap or the separated portion due to the above-mentioned cause, and the separation is further increased, and furthermore, the stable maneuverability is impaired. In addition, durability such as rust, stick-slip, and abnormal noise is significantly impaired.

Therefore, an object of the present invention is to prevent the inner cylinder from moving when drawing a bush, improve dimensional accuracy, eliminate variations at the time of assembly, improve the adhesiveness and durability, and improve the external performance. An object of the present invention is to provide a bush drawing jig that eliminates the fall of a cylinder flange.

[0007]

Means for Solving the Problems The present invention has been proposed to achieve the above object, and has the following structure. That is, according to the present invention, the inner cylinder, the elastic member, and the outer cylinder have a hole for inserting and holding a bush concentrically arranged from the inside to the outside in the order of the outer cylinder, and the outer peripheral surface has a taper, and A diaphragm piece composed of a plurality of divided bodies in the axial direction of the hole, and an inner peripheral surface of the hole having a taper, cooperating with the taper of the diaphragm piece to move the divided body in the radial direction thereof, A throttle jig for narrowing the diameter of the outer cylinder, wherein a stopper for preventing movement of the inner cylinder of the bush inserted and held in the draw frame during the drawing is provided on the throttle jig. A bush drawing jig is provided.

Further, according to the present invention, the drawing jig for the bush is arranged in such a manner that the top end of the upper flange of the outer cylinder before the start of drawing is in contact with the notch formed in the body of the drawing piece. Is provided.

Further, according to the present invention, there is provided a drawing jig for the bush, wherein a stopper is detachably formed on the drawing jig.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The first feature of the bush drawing jig of the present invention is that the drawing jig is provided with a stopper for preventing movement of the inner cylinder of the bush inserted and held in the drawing piece during drawing. On the point. Further, the second feature is that, by arranging the top end of the upper flange of the outer cylinder in contact with the notch formed in the body of the drawing piece, the entire outer cylinder is narrowed at the time of drawing. The advantage is that the aperture can be made uniform and a bush with excellent durability can be manufactured. Furthermore, a third feature is that the stopper is detachably formed on the drawing jig.

[0011] With this structure, the movement of the inner cylinder of the bush is suppressed at the time of drawing, thereby improving the adhesiveness and durability, improving the dimensional accuracy, eliminating the variation at the time of assembling, and as described above, The disadvantage of the conventional bush drawing jig, in which the flange of the cylinder easily falls down, can be eliminated, and the stopper can be removed if a stopper is not particularly required.

In the bush of the present invention, the inner and outer cylinders and the elastic body are integrated by baking adhesion. As the stopper, rubber, resin or the like having a hardness that does not damage the product is preferably used. However, for example, a soft metal such as aluminum may be used.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a bush drawing jig showing an embodiment of the present invention, FIG. 2 is a cross-sectional view of a bush drawing jig showing a preferred embodiment of the present invention, and FIG. It is a top view of the drawing piece of a drawing jig. In the drawing, a bush drawing jig 1
Is a hole 6 for inserting and holding a bush 5 concentrically arranged from the inside to the outside in the order of the inner cylinder 2, the elastic member 3, and the outer cylinder 4.
A stop piece 9 having a taper 7 on the outer peripheral surface thereof and comprising a plurality of divided bodies 8 divided in the axial direction of the hole 6;
0 has a taper 11 on the inner peripheral surface, and a taper 7
And a drawing jig 12 for moving the divided body 8 in the radial direction in cooperation with the drawing, and reducing the diameter of the outer cylinder 4 of the bush 5. The inner cylinder of the bush 5 inserted and held in the drawing top 9 at the time of drawing. 2
Is provided on the drawing jig 12.

As shown in FIG. 4, the inner cylinder 2 of the bush 5 is provided with a flange 21 on a relatively thick cylindrical body 20 and is made of iron (SWRCH).
C), and is baked and bonded via an outer cylinder 4 made of C). The elastic member 3 is made of rubber having sufficient elasticity. The outer cylinder 4 is fitted on the outer peripheral surface of the elastic member 3. Bush 5 configured in this way
Is inserted and held in the hole 6 of the stop piece 9.

The drawing piece 9 of the bush drawing jig 1 has a truncated cone shape, and in this embodiment, has a divided body 8 divided into eight equal parts. Note that the divided body 8 is at least equal to or more than two equal parts, and there is no particular upper limit. However, the upper limit is limited to about sixteen equal parts for manufacturing reasons, and it is easy to create even-numbered parts.

A shaft 30 is attached to the drawing jig 12, and an operation source such as an actuator which can move forward and backward is connected to the shaft 30. Furthermore, this drawing jig 12
In the figure, the large hole 10 in the shape of an inverted truncated cone is clear. The inner peripheral surface of this hole 10 is the above-mentioned taper 11 and
When the drawing jig 12 is moved in the direction of the arrow a in FIG. 1 by the shaft 30 so as to come into contact with the taper 7 on the outer peripheral surface of FIG. 2 to move in the direction of the middle arrow b.

The stopper 13 is attached to substantially the center of the bottom 31 of the hole 10. That is, the stopper 13 is formed by attaching the bolt 33 to the disk 32, and the bolt 33 is screwed into the screw hole 34 formed in the bottom 31. Therefore, the stopper 13 can be freely attached to and detached from the drawing jig 12. Further, by adjusting the screwing amount, the stopper 13 can be brought into contact with the flange 21 surface of the inner cylinder 2 in the bush 5 inserted and held in the hole 6 of the drawing top 9. The distance m between the stopper 13 and the end face of the disk 32 can be adjusted.

In the present invention, when the bush is processed and drawn by using the drawing jig 1, the upper flange tip 23 a of the outer cylinder 4 before the start of drawing is formed by a notch formed in the body of the drawing top 9. By arranging the outer cylinder 4 in a state in which it is in contact with 9a, the entire outer cylinder 4 can be uniformly squeezed at the time of squeezing, and the durability of the product can be improved.

Further, as described above, the entire outer cylinder 4 including the upper flange tip 23a is uniformly squeezed,
The disadvantage that the flange tip 23a of the product falls down inward is also eliminated. At this time, the flange portion expanding from the outer cylinder has a smaller radius than the acute angle as shown in FIG.
Is preferably brought into contact with the aperture piece 9 with

Hereinafter, an example of a method of manufacturing the bush 5 using the bush drawing jig 1 having the above configuration will be described. First, an inner cylinder 2 made of iron, an elastic member 3 made of rubber, and an outer cylinder 4 made of steel were used. The elastic member 3 is made of a material having NR (natural rubber) and a rubber hardness of 60 ° Shore AHs by an electric heating vulcanizing press at a temperature of about 170 ° C. for about 15 minutes.
It is molded under a pressure of 200 kg / cm ² . Then
The inner and outer cylinders are baked and adhered by this elastic member to produce a bush.

The bush 5 is inserted and held in the hole 6 of the stop piece 9 set on a flat plate as shown in FIG. On the other hand, the stopper 13 is attached to the bottom 31 of the hole 10 of the drawing jig 12 and its position is adjusted. After that, the drawing jig 12 is put on the drawing piece 9 and lowered by the shaft 30, and the divided body 8 is formed by the tapers 7 and 11 of both the jigs 9 and 12.
Moves in the direction of the arrow b to reduce the diameter of the outer cylinder 4 of the bush 5. The aperture amount is about 1 mm to a maximum of about 3 mm. During the drawing process, the inner cylinder 2 attempts to move to the bottom 31 side of the hole 10, but is prevented by the stopper 13 and cannot move.

Accordingly, the flange 23 of the outer cylinder 4 does not fall down, the dimension t between the flange 21 of the inner cylinder 2 and the flange 23 of the outer cylinder 4 is kept constant, and the assembling of the bush 5 is performed accurately. I can do it. In addition, the elastic member 3 proximate to the flanges 21 and 23 of the inner cylinder 2 and the outer cylinder 4 is not subjected to excessive tension, its adhesiveness and durability are maintained, a gap is formed, and the worst-case elastic member There is no possibility that a part or all of the adhesive portion between the inner cylinder 3 and the inner cylinder 2 and the outer cylinder 4 is peeled off.

Although an embodiment of the present invention has been described above, the specific configuration is not limited to this, and it goes without saying that changes and additions of obvious configurations are allowed without departing from the gist of the present invention. No.

[0024]

As described in detail above, according to the present invention,
Since the stopper is provided on the drawing jig to prevent the movement of the inner cylinder of the bush inserted and held in the drawing piece during the drawing, the movement of the inner cylinder of the bush can be suppressed during the drawing. Therefore, it is possible to improve the adhesiveness and durability of the bush after drawing, improve the dimensional accuracy, and eliminate variations during assembly. In addition, by contacting the top end of the upper flange of the outer cylinder with the notch provided in the body of the drawing piece, the inconvenience of the conventional bush drawing processing jig in which the flange of the outer cylinder of the bush is easy to fall can be more effectively solved. . It is needless to say that the stopper can be removed when the stopper is not particularly required.

[Brief description of the drawings]

FIG. 1 is a sectional view of a bush drawing jig showing an embodiment of the present invention.

FIG. 2 is a sectional view of a bush drawing jig showing a more preferred embodiment of the present invention.

FIG. 3 is a plan view of the other jig of the bush drawing jig of FIG. 1;

FIG. 4 is a sectional view showing a bush.

FIG. 5 is a sectional view similar to FIG. 1 showing a conventional example.

[Explanation of symbols]

 1, 50 bush drawing jig 2 inner cylinder 3 elastic member 3a outer part 4 outer cylinder 5 bush 6, 3b hole 7, 11 taper 8 divided body 9 drawing piece 9 a notch 10 hole 12 drawing jig 13 stopper 20, stopper 20, 22 Cylindrical body 21, 23 Flange 23a Front end of outer cylinder flange 30 Shaft 31 Bottom 32 Disk 33 Bolt 34 Screw hole

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kazuhiko Abe 2-3-6 Shirite, Tsurumi-ku, Yokohama-shi, Kanagawa F-term in Hokushin Kogyo Co., Ltd. 3J059 AD05 BA42 BB01 BD05 EA02 GA04

Claims (3)

[Claims] An inner tube, an elastic member, and an outer tube are provided with a hole for inserting and holding a bush concentrically arranged from the inside to the outside in the order of the inner tube, the outer peripheral surface thereof has a taper, and the hole is provided. An aperture piece composed of a plurality of divided bodies in the axial direction of the bush; and a taper on the inner peripheral surface of the hole, and moving the divided body in the radial direction in cooperation with the taper of the aperture piece to form the bush. A bushing, comprising: a drawing jig for reducing the diameter of the outer cylinder; and a stopper provided in the drawing jig for preventing movement of the inner cylinder of the bush inserted and held in the drawing piece during the drawing process. Drawing jig. 2. The drawing jig for a bush according to claim 1, wherein the front end of the upper flange of the outer cylinder before the start of drawing is placed in contact with a notch formed in the body of the drawing piece. 3. The bush drawing jig according to claim 1, wherein said stopper is detachably formed on said drawing jig.