JPH0763899B2 - Press-fitting device for rubber bush - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention has a so-called rubber bush formed by holding an outer cylinder on the outer side of an inner cylinder via a flexible material such as rubber by press-fitting it into a work. A press-fitting device to be attached.

(Prior Art) Conventionally, for connecting parts of suspension parts of automobiles,
A so-called rubber bush is used, and there is such a rubber bush that an outer cylinder is formed by baking an outer cylinder member, which is divided into a plurality of pieces in the circumferential direction on the outer side of an inner cylinder via rubber, on a coaxial cylinder. .

That is, for example, as shown in FIGS. 4 and 5, the rubber bush A has an outer cylinder 4 formed concentrically on the outer side of the inner cylinder 1 with a flexible material (hereinafter referred to as a rubber portion) 2 such as rubber interposed therebetween. A rubber part 2 is baked around the inner cylinder 1 around its center, and two outer cylinder members 3 are provided on the outer side of the rubber part 2.
The outer cylinder 4 is formed by concentrically baking on the axis O-O.

This type of rubber bush A has a bed B as shown in FIG.
The work D is positioned by a positioning pin C that can be projected and retracted and set at a predetermined position on the bed B.
It is adapted to be press-fitted into the hole E by a press-fitting head F attached to the tip of a slide that is vertically movable.

(Problems to be Solved by the Invention) By the way, when the rubber bush A of this kind is press-fitted into the hole E of the work D by such a press-fitting device, the outer peripheral surface of the rubber bush A of this kind has a plurality of outer cylindrical members as described above. 3 is the rubber part 2
Since the outer cylinder member 3 of the rubber bush A has a large variation in outer shape and dimensions,
May contact the edge of the hole E formed in the work D unevenly (per piece).

As described above, when the rubber bush A is pressed to the hole E of the work D in the initial stage of the press fitting, the outer cylinder member 3 is divided and is not a continuous body in the outer peripheral direction.
The pressure input from the press-fitting head F is intensively applied to the outer cylinder member 3, causing a difficult difference (see FIG. 8) between the outer cylinder members 3 and the work D.
The upper part of the rubber bush A may be opened as shown by the arrow in FIG. 7 by the reaction force from the edge of the hole E, and eventually the outer cylinder member 3 may be deformed or the rubber bush A may be damaged. For this reason, there is a problem that the press-fitting work is difficult and the press-fitting cannot be performed well.

The present invention has been made based on such circumstances, and eliminates the occurrence of this kind of trouble in a press-fitting device for a rubber bush having a divided outer tubular member, and ensures good press-fitting. That is the purpose.

(Means for Solving the Problem) To this end, in the present invention, in this type of rubber bush press-fitting device, the press-fitting head has a columnar shape, and the press-fitting head main body has the end face. A plurality of bodies, which are capable of projecting and retracting in a radial direction from the peripheral surface near the end surface of the main body, and have at least one tip end located outside each of the outer cylinder members of the rubber bush abutting the end surface. Each claw member is mounted on the outside of the press-fitting head body so as to be capable of reciprocatingly sliding in the press-fitting direction relative to the press-fitting head, and the tip of the claw member is moved inward in the radial direction with the start of press-fitting. And a cylindrical claw driving member having a cam surface on its inner surface for pressing the outer cylindrical member to reduce the diameter of the rubber bush.

(Operation) According to the present invention, when the rubber bush is press-fitted, the pawl drive member is displaced with respect to the press-fitting head main body, whereby the tip end portion of the pawl member is displaced in the diameter reducing direction, that is, radially inward of the rubber bush, It is possible to press the outer cylinder member to reduce the diameter of the rubber bush and hold it, and by further press-fitting, the rubber bush can be surely pressed into the hole of the work in a reduced diameter holding state.

(Embodiment) The present invention will be described below with reference to an embodiment shown in FIGS. 1 to 3. The same or equivalent part members as in the conventional example are designated by the same reference numerals, and the description thereof will be omitted.

The press-fitting device 11 is a publicly known device having a bed 13 for pointing the work 12 and a slide 14 configured to be capable of advancing and retracting toward the bed 13.

A receiving seat 15 and a positioning pin 17 biased by a spring 16 to project at a predetermined position of the receiving seat 15 are installed in the bed 13 so as to be retractable.

On the upper surfaces of the bed 13 and the receiving seat 15, a suspension part of an automobile having a hole 18 formed in advance is installed as a work 12, and the positioning pin 17 is inserted into the hole 18 formed in the work 12 so that the work is Twelve positionings are made.

At the center of the upper surface of the positioning pin 17, a protrusion 21 is formed integrally with a small-diameter columnar shape, and the protrusion 21 is fitted to the inner cylinder 1 of the rubber bush A, so that the rubber bush A It serves as a press-fitting guide.

On the other hand, the press-fitting head 24 of the rubber bush A is attached to the lower end of the slide 14.

The press-fitting head 24 is a columnar press-fitting head main body 25 fixed to the lower surface of the slide 14, and a tubular claw drive member 26 fitted to the lower outside of the press-fitting head main body 25.
It has a claw member 34 provided between the press-fitting head body 25 and the claw driving member 26.

The press-fitting head main body 25 has an end surface 25a that comes into contact with the bush A, and the rubber bush A is held on this end surface 25a.
The work of press-fitting into the second hole 18 is performed.

Therefore, the end surface 25a of the press-fitting head main body 25 is formed into a flat surface except for a central portion described later, and the press force is transmitted to the rubber bush A while being held by the end surface 25a.

A protrusion 27 similar to the protrusion 21 of the positioning pin 17 is formed at the center of the end face 25a of the press-fitting head main body 25. In this example, a rubber ring 28 is attached to the tip of the protruding portion 27, and the rubber bush 28 is crushed and inserted into the inner peripheral surface of the inner cylinder 23 so that the rubber bush A is attached to the rubber ring A. It is adapted to be held in the press-fitting head main body 25 by the elastic force of 28. This is adopted when the press-fitting head 24 moves like a robot to bring the rubber bush A from another position, but it can be held by the projection 21 of the positioning pin 17 as in the conventional case. .

Then, two claw devices 31 are installed at positions on the outer peripheral surface near the end surface 25a of the press-fitting head main body 25 at positions symmetrical with respect to the horizontal section (see FIG. 2).

These claw devices 31 are obtained by inserting a compression spring 33 and a claw member 34 into a blind hole 32 formed in the outer peripheral surface of the press-fit head body 25, and the claw member 34 is pressed by the compression spring 33. It is possible to project and retract in a radial direction from the peripheral surface of the.

The outer side surface 34a of the claw member 34 is formed by a smooth bulging curved surface, and the tip end portion 34b thereof is located below the end surface 25a of the press-fitting head 25. Therefore, before the press-fitting operation, at least one claw member is positioned outside each outer cylinder member 3 of the rubber bush A that is in contact with the end surface 25a.
34 are provided.

The claw driving member 26 is mounted on the outside of the lower portion of the press-fitting head body 25 so as to be capable of reciprocatingly sliding relative to the press-fitting head in the press-fitting direction. The claw driving member 26 engages the tip end portion 34b of the claw member 34 with the outer cylinder member 3 with the start of press fitting,
The inner surface of the cylinder has a cam surface that reduces the diameter of the rubber bush. A coil spring 37 is wound between a spring seat 35 formed on the upper part of the claw driving member 26 and a spring seat 36 formed on the press-fitting head main body 25, and the claw driving member is normally provided.
Twenty-six are biased downward.

When the pawl drive member 26 is at the lower end position, the tip 26a of the pawl drive member 26 has a length substantially equal to the thickness of the lower end position of the rubber bush A when attached to the end surface 25a of the press-fitting head main body 25. It only protrudes downward from the end surface 25a.

Therefore, the press-fit head 24 is operated to move the rubber bush A.
The tip 26a of the pawl drive member 26 comes into contact with the upper surface of the work 12 at the same time when the press-fitting of the pawl drive member 26 is started, so that the upward movement of the pawl drive member 26 with respect to the press-fitting head main body 25 is started.

Further, when the claw driving member 26 is at the lower end position with respect to the press-fitting head main body 25, a concave portion 41 is formed on the inner surface of the claw driving member 26 which the claw member 34 of the claw device 31 faces.
The outside of the claw member 34 is fitted in the recess 41 (see FIG. 3 (a)). In this case, the tip 34b of the claw member 34 is projected outward in the radial direction. The rubber bush A is held in an open state that is larger than the diameter of the rubber bush A.

The recess 41 has a gentle slope on the side on which the work 12 is located and a flat surface on the opposite side orthogonal to the press-fitting direction. That is, the cam surface on which the claw member 34 is projected and retracted is composed of the inner surface of the claw drive member 26 and the recess 41.

Specifically, the claw member 34 has a function as a stopper that regulates the lower end position of the claw drive member 26 in cooperation with these recesses 41, and conversely allows the claw drive member 26 to move upward. There is.

The press-fitting device 11 thus configured operates as follows.

First, the inner cylinder 1 is fitted to the protruding portion 27 of the press-fitting head 24 located at the top dead center to hold the rubber bush A.

At this time, since the claw driving member 26 of the press-fitting head 24 is located at the lower end position of the press-fitting head main body 25 by the pressing force of the coil spring 37, the tip 34b of the claw member 34 is in the open state as described above, and the rubber bush ring 28 is used. The rubber bush A can be easily attached by contacting the end face 25a of the press-fitting head main body 25 by crushing.

Next, when the slide 14 is operated to lower the press-fitting head 24, the protrusion 21 of the positioning pin 17 is inserted into the inner cylinder 1 to guide the lowered position of the rubber bush A.

Further, when the press-fitting head 24 is lowered and the end face of the projecting portion 27 comes into contact with the end face of the projecting portion 21, the tip end 26a of the pawl driving member 26 comes into contact with the upper surface of the work 12 almost at the same time.

At the same time, the press-fitting operation of the rubber bush A of the press-fitting head 24 is started.

That is, the press-fitting head 24 retracts the positioning pin 17 against the elastic force of the spring 16, and the pawl drive member 26 moves to the third position.
Displacement occurs relative to the press-fitting head main body 25 as indicated by an arrow in FIG. 4A, and the claw member 34 escapes from the recess 41 formed in the claw driving member 26 (see FIG. 3B).

Due to the displacement of the claw driving member 26, the tip end portion 34b of the claw member 34 is
The position is moved radially inward by the dimension l, and the claw member 34 is closed.

Along with this, the upper flange portion of each outer cylinder member 3 facing the inside of the tip end 34b of the claw member 34 has the tip end 34b.
Is pressed inward in the radial direction by a rubber part that is a flexible material inside
Bend 39 to reduce the diameter of the rubber bush A.

Therefore, even if the outer cylinder member 3 comes into partial contact at the initial stage of the press-fitting of the rubber bush A, these claw members 34 restrain the opening of the upper part of the outer cylinder member 38, and further correct the posture of the outer cylinder member 38. The rubber bush A can be reduced in diameter, and as a result,
The rubber bush A can be easily and surely pressed into the work 12 in a good condition.

The press-fitting head 24 continues the descending stroke, and the tip end portion 34b of the claw member 34 is driven by the claw driving member 26 during the press-fitting operation.
Is maintained in this closed (reduced diameter) state, the opening of the claw member 34 is restricted, and the rubber bush A is pressed into the hole 18 of the work 12 to a predetermined depth.

After that, the press-fitting head 24 turns to the ascending stroke and the tip 26a of the claw driving member 26 separates from the surface of the work 12, so that the claw member 34 returns to the original open state and the press-fitting head 24 top dead center. The work of press-fitting the rubber bush A is completed.

Therefore, the mounting work of the rubber bush for the next press-fitting work can be easily performed as it is as in the previous time.

(Effect of the Invention) Since the present invention is configured as described above, the tip end portion of the pawl member is displaced inward in the radial direction by the relative displacement of the pawl drive member with respect to the press-fitting head main body when the rubber bush is press-fitted. Then, the locking member restricts the opening of the pawl member and the diameter is reduced, so that the outer cylinder member of the rubber bush comes into uneven contact with the edge of the hole of the workpiece. Even in the case, it is possible to prevent the outer cylinder member from opening due to the reaction force from the work. As a result, the inclination of the outer cylinder member does not become large when the rubber bush is press-fitted, and the rubber bush can be reliably secured in a good state. Can be pressed.

Furthermore, since a tubular claw driving member is used as the structure for operating the claw member and the cam surface is formed on the inner surface of the claw driving member, the press-fitting operation of the press-fitting head is utilized with a relatively simple structure. This type of rubber bush can be reliably press-fitted.

[Brief description of drawings]

1 to 3 relate to an embodiment of the present invention, FIG. 1 is an overall cross-sectional view of an essential part, FIG. 2 is a II-II cross-sectional view of FIG.
FIGS. 3 (a) and 3 (b) are explanatory views of the operation of the claw member and the lock member, FIGS. 4 to 8 relate to a conventional example, FIG. 4 is a top view of the rubber bush, and FIG. 5 is a side surface of the rubber bush. Figure, 6th
FIG. 7 is a cross-sectional view of a main part of a conventional press-fitting device, FIG. 7 is a cross-sectional view of a partially pressed rubber bush, and FIG. 8 is a cross-sectional view showing a difference between outer cylinder members. A: Bush, 1; Inner cylinder, 2; Flexible material, 3; Outer cylinder, 11; Press-fitting device, 12; Workpiece, 18; Hole, 23; Inner cylinder, 24; Press-fitting head, 25;
Press-fit head main body, 25a; end face, 26; lock member, 26a; tip, 34; claw member, 34b; tip, 38; outer cylinder member, 39; flexible material (rubber portion), 41; recessed portion.

Claims (1)

[Claims] 1. An outer cylinder is concentrically provided on the outer side of an inner cylinder via a flexible material such as rubber, and a rubber bush formed by a plurality of outer cylinder members obtained by dividing the outer cylinder in the circumferential direction is provided with the rubber bush. In a rubber bush press-fitting device in which a shaft center of a bush is aligned with a shaft center of a hole of a work and is pressed by an end face of a press-fitting head to press-fit into the hole, the press-fitting head has the end face and has a columnar press-fitting shape. The head main body and the press-fit head main body can be protruded and retracted in a radial direction from the peripheral surface near the end surface to be retracted, and the tip end of each of the rubber bushes abutted against the end surface on the outer side of the outer cylinder member. A plurality of claw members positioned at least one are mounted on the outside of the press-fitting head main body so as to be capable of reciprocatingly sliding relative to the press-fitting head in the press-fitting direction. Move inward in the radial direction A press-fitting device for a rubber bush, comprising: a tubular claw driving member having a cam surface on its inner surface for pressing the outer tubular member to reduce the diameter of the rubber bush.