JP2800942B2 - Bush press-in device and bush press-in method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a bush press-fitting device and a bush press-fitting method, and more particularly to a bush press-fitting device and a bush press-fitting method preferably used for a bush formed of an elastic body. .

[Prior art and its problems]

Generally, an apparatus as shown in FIGS. 6 and 7 is used to press a bush formed of an elastic body into a work.

That is, the one shown in FIG. 6 is such that the bush 25 is press-fitted into the hole 22 of the work 21 by utilizing the press by the press-fit pin 26, and the one shown in FIG. The bush 25 is pressed into the hole 22 of the work 21 by utilizing the tapered hole 24 and the pressing by the press-fit pin 26.

However, in the prior art as described above, in the one shown in FIG. 6, when the interference is large, the bush 25 is greatly bulged radially outward by the pressing by the press-fit pin 26, For this reason, there is a problem that it is difficult to press-fit.

In FIG. 7, the bush 25 is press-fitted by the taper guide 23 while suppressing deformation of the bush 25 to the outside in the radial direction when pressed by the press-fit pin 26. In this case, the resistance at the time of press-fitting becomes large and it becomes difficult to press-fit, and since the taper guide 23 is in contact with the upper surface of the work 21, it is difficult to press-fit the bush 25 to a predetermined position. There was a problem that it would be.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and has a bush press-fitting device and a bush capable of easily press-fitting a bush into a hole of a work even in a case of a large interference. It is intended to provide a press-fitting method.

[Means for solving the problem]

In order to solve the above-mentioned problems, the present invention is provided on a base, a positioning pin that can protrude and retract from an upper surface thereof, and a movable member that is disposed so as to be able to approach and separate from the upper surface of the base, A press-fit guide having a tapered hole which is located on the same axis as the positioning pin and has a diameter gradually increasing in a direction in which the positioning pin is separated from the press-fit guide. And a cutter formed on an inclined surface with the positioning pin side of the tip sequentially approaching the center of the tapered hole, and disposed above the movable member. And a press-fit pin that can be inserted into and retracted from the tapered hole of the press-fit guide. The work is placed on the base by aligning the holes of the work with the base, and thereafter, the movable member provided above the base is brought into contact with the upper surface of the work to be provided on the movable member. The bush is inserted into the press-fitting guide, and the press-fit pin provided above the movable member is lowered, so that the bush is pressed into the press-fitting guide. When press-fitting through the tapered hole of the guide, the cutter provided with the tip protruding into the tapered hole is in a state in which a part of the bush is deformed inward, and in this state, the bush is The means for press-fitting into the hole of the work is adopted.

[Action]

According to the present invention, by adopting the above means, the bush inserted into the taper guide is deformed radially inward through the taper hole of the taper guide and the inclined surface of the cutter by the press of the press-fit pin, so that the inside of the hole of the work is reduced. The work can be easily press-fitted into the hole, and can be easily press-fitted even when the interference is large.

〔Example〕

Hereinafter, embodiments of the present invention shown in the drawings will be described.

FIGS. 1 to 3 show a bush press-fitting device according to the present invention. FIG.
The figure is a side view of what is shown in FIG. 1, and FIG. 3 is a partial explanatory view of what is shown in FIG. 1 and FIG.

That is, the bush press-fitting device shown in FIGS. 1 to 3 includes a positioning pin 3 provided on the base 1 and the base 1.
The press-fitting guide 7 is disposed on the movable member 5 which is disposed so as to be able to contact and separate from the press-fitting guide, and is disposed coaxially with the positioning pin 3. And a press-fit pin 11 disposed above the movable member 5.

The positioning pin 3 is provided in the hole 2 provided in the base 1.
The base 1 is urged by a spring 4 so as to be able to protrude and retract from the upper surface of the base 1, and an opening 2 of the base 2 is provided with an annular recess 2a. The recess 2a serves as a relief at the tip of the bush when the bush is pressed into the work.

The press-fitting guide 7 is provided in a hole 6 provided in the movable member 5 and has a cylindrical shape, and a tapered hole 8 having a diameter gradually increasing in a direction opposite to the base 1 inside the hole. The press-fitting guide 7 has a plate-like cutter (a deforming tool, hereinafter referred to as a cutter) in a state in which a tip portion 10 protrudes into the tapered hole 8 from a direction orthogonal to the tapered hole 8. In this case, a tip 10 of the cutter 9 is formed on a slope that gradually approaches the center of the tapered hole 8 as it approaches the base 1.

As shown in FIG. 3, the relationship between the press-fitting guide 7 and the cutter 9 is such that the cutter 9 is disposed in the tapered hole 8 of the press-fitting guide 7 with its tip protruding. .

The press-fit pin 11 can be moved up and down, and can be protruded and retracted in a press-fit guide 7 provided in the movable member 5. The tip of the press-fit pin 11 is connected to the press-fit guide 7. At the time of immersion, the tip of the cutter 9 protruding into the tapered hole 8 of the press-fitting guide 7 is prevented from abutting.
A notch 12 and a slot 13 are provided.

 Next, the operation of the above-described device will be described.

In order to press-fit a bush into a hole of a work using the bush press-fitting device configured as described above, first, the positioning pin 3 provided on the base 1 is pressed from the upper surface of the base 1 by the urging force of the spring 4. The work 14 is placed on the upper surface of the base 1 by holding it in a protruding state and aligning the holes 15 of the work 14 with the positioning pins 3.

Next, the movable member 5 located above the base 1 is lowered to come into contact with the upper surface of the work 14, and the tapered hole 8 of the press-fit guide 7 provided on the movable member 5 and the hole 15 of the work 14 are moved. At the same time, the work 14 is held on the upper surface of the base 1 by the contact of the movable member 5 with the upper surface of the work 14.

Next, a bush 16 made of an elastic material is inserted into the press-fitting guide 7 from above, and the press-fitting pin 11 located above the press-fitting guide 7 is moved down to lower the bushing.
The bush 16 is gradually pressed into the hole 15 of the work 14 via the press-fitting guide 7 by pressing the bush 16.

In this case, when the bush 16 passes through the tapered hole 8 of the press-fitting guide 7, the taper surface of the tapered hole 8 suppresses the deformation outward in the radial direction.
When the outer peripheral surface of the cutter 16 comes into contact with the tip portion 10 of the cutter 9 projecting into the tapered hole 8, the slope of the tip portion 10 changes the circular state from the circular state as shown in FIGS. It is reduced and deformed so as to be crushed inward in the radial direction, and is easily pressed into the hole 15 of the work 14.

When the bush 16 is completely pressed into the hole 15 of the work 14, the lower end of the bush 16 is located in the recess 2a of the opening of the hole 2 of the base 1, and at this time, The positioning pin 3 is compressed by the press-fit pin 11 so that the spring 4 is contracted and sunk into the hole 2 of the base 1.

Thereafter, the movable member 5 in contact with the upper surface of the work 14 is raised and separated from the upper surface of the work 14 so that the bush 16 pressed into the hole 15 of the work 14 returns to its original shape due to its elastic force. The bush 16 is pressed into the hole 15 of the work 14 in this manner.

Therefore, when the bush press-fitting device according to the present invention is used as described above, the bush is reduced and deformed inward in the radial direction and press-fitted into the hole of the work. Also in this case, since the resistance at the time of press-fitting can be reduced by contracting and deforming the bush inward in the radial direction, the press-fitting becomes easy.

In addition, the taper angle of the tapered hole 8 of the press-fitting guide 7,
The inclination angle of the tip of the cutter 9 and the length of the cutter 9 projecting into the tapered hole 8 may be changed depending on the shape and dimensions of the bush.

〔The invention's effect〕

Since the present invention is configured as described above, the bush is reduced inward in the radial direction and press-fitted, so that press-fitting to the work can be easily performed and press-fitting is performed even when the interference is large. Since the resistance at the time can be reduced, the press-fitting can be easily performed, so that the working efficiency can be remarkably improved.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing the entire bush press-in device according to the present invention, FIG. 2 is a side view of the device shown in FIG.
FIG. 4 is a partial explanatory view of what is shown in FIG. 1 and FIG.
FIG. 5 is a view showing a state before deformation of the bush, FIG. 5 is a view showing a state after deformation of the bush, and FIGS. 6 and 7 are schematic explanatory views showing a conventional bush press-fitting device. DESCRIPTION OF SYMBOLS 1 ... Base 2, 6, 15, 22 ... Hole 3 ... Positioning pin 4 ... Spring 5 ... Movable member 7 ... Press-fit guide 8, 24 ... Tapered hole 9 ... Cutter 10 ... Tip 11 , 26 ... Press-fit pin 12 ... Notch 13 ... Slit 14,21 ... Work 16,25 ... Bushing 23 ... Taper guide

Claims (2)

(57) [Claims] 1. A positioning pin (3) provided on a base (1) and capable of protruding and retracting from an upper surface thereof, and a movable member (5) provided on the upper surface of the base (1) so as to be capable of coming into contact with and separating from the upper surface. A press-fit guide (10) provided with a tapered hole (8) which is provided on the inner side and is coaxial with the positioning pin (3) and has a diameter gradually increasing in a direction away from the positioning pin (3). 7) and a tip (10) is disposed in a tapered hole (8) of the press-fitting guide (7) with a tip (10) projecting from a direction orthogonal to the tapered hole (8). (1
0) a cutter (9) formed on an inclined surface such that the positioning pin (3) side sequentially approaches the center of the tapered hole (8);
A bush press-fitting device, comprising a press-fit pin (11) disposed above the movable member (5) and capable of protruding and retracting in a tapered hole (8) of the press-fit guide (7). The positioning pin (3) is held so as to protrude from the upper surface of the base (1), and the hole (15) of the work (14) is aligned with the positioning pin (3). ) Is placed on the base (1), and thereafter, the movable member (5) provided above the base (1) is brought into contact with the upper surface of the work (14), and the movable member ( 5) Align the tapered hole (8) of the press-fitting guide (7) provided with the hole (15) of the work (14), and then insert the bush (16) into the press-fitting guide (7). At the same time, when the press-fit pin (11) provided above the movable member (5) is lowered to press the bush (16) through the tapered hole (8) of the press-fit guide (7), A cutter (9) provided with a tip (10) protruding into the tapered hole (8) A state in which a part of the deformed inward bushing (16), the bush (1 in this state
6. A bush press-fitting method, wherein 6) is press-fitted into a hole (15) of the work (14).