JPH09117874A - Bush extraction device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bush extraction device less dangerous, eliminating complicated work and capable of carrying out speedy and efficient bush extraction work. SOLUTION: A cam 46 is turned by lowering a drift main body 40 in dimension free to insert it into the inside of a bush 30, a rod 44 is pushed down by this cam 46, a click 48 is brought into contact with an end surface of the bush 30 on the lower side by delivering the click 48 in a cavity part 62, and extraction pressure is applied on the bush 30 on the lower side. Thereby, the bush 30 is extracted from a pin hole 28 of a work coupler 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bush extracting device used for extracting a bush press-fitted into a machine part (workpiece). In particular, the present invention relates to a bush extracting device suitable for extracting a bush with a collar that is used in a connector of a railway vehicle and the like.

[0002]

2. Description of the Related Art As a connecting device for connecting rail cars, there is a close contact connector. This close-fitting connector has advantages such as less vibration at the time of connection, and is mainly used for passenger railway vehicles. FIG. 8: is a perspective view which shows the connection body of the structural member of a close contact connector. FIG. 9 is a perspective view of a shock absorber of the close-fitting connector. FIG. 10: is a perspective view of the arm joint which connects a connection body and a shock absorber. As shown in FIG.
The connection body 10 is composed of various parts such as a main body 12, an air pipe 14, and a lock 16. On the other hand, the shock absorber 20 is
As shown in FIG. 9, the frame 22 and various parts such as a spring box 24 in which a spring is housed are formed. Mounting portions 18 and 26 are formed at the ends of the connecting body 10 and the shock absorber 20, respectively. By mounting the interlocking joint 15 shown in FIG. 10 with a pin (not shown) on the mounting portions 18 and 26 to intervene, the coupling body 10 and the shock absorber 20 are connected, and the function as a close coupling connector is achieved. Fulfill

The pin joint 28 is formed with two pin holes 28 and 29 in the orthogonal direction. This pin hole 28,
By rotating 29 and the pin, the vertical and horizontal two-dimensional movements generated between the coupling body 10 and the shock absorber 20 are generated.
The mechanism is such that it can be absorbed by the movement of the arm joint 15. Bushings 30 and 31 that have been carburized and quenched are press-fitted into these pin holes 28 and 29. The bushes 30 and 31 are extracted and replaced at the time of periodical maintenance of the vehicle (an example of a cycle is 3 years).

FIG. 11 is a cross-sectional view showing the structure around the pin hole of the arm joint and showing a conventional bush extracting operation. As shown in the figure, the bush 30 press-fitted into the pin hole 28 of the arm joint 15 has a collar 30A formed on one end surface thereof. For this reason, the bush 30 cannot be pulled out by pushing it from the outside of the wax joint 15, and at the time of the pulling out work, the bush joint 1
5 to the bush 3 from the gap 62 formed in the central portion of
It is necessary to push 0 to the outside and pull it out. Therefore, in the related art, first, the extraction jig 32 (rectangular plate shape) with a handle is obliquely inserted from the upper pin hole 28 on the end surface of the bush 30 which is press-fitted into the lower pin hole 28. To do. Next, the pushing member 34 (pipe) is pulled out and the jig 3
The bush 30 is pulled out by pushing down the ram 36 of the press machine in the direction of the arrow after it is placed on top of the bush 2.

[0005]

However, the conventional bush extraction work has the following problems. When inserting the extraction jig 32, an operator must put his / her hand between the ram 36 of the press machine and the wack joint 15, which is dangerous. In addition, it takes time and effort to insert the jig. When inserting the extraction jig 32, the bush 30
It is necessary to accurately position it along the end face of the, and the work is complicated and time consuming. Insertion of the extraction jig 32, insertion of the pressing member 34, extraction by a press machine and three steps of work are required.
Poor work efficiency.

The present invention has been made in view of the above circumstances, and is low in danger when the bush is pulled out, and complicated work such as positioning of the pulling jig is unnecessary and efficient. It is an object of the present invention to provide a bush extracting device capable of extracting a bush.

[0007]

The bush removing device of the present invention is a device for removing a tubular bush press-fitted into a hole of a work from the work;
A drift body that can be inserted into an inner hole of the bush, a claw that is provided so as to be retractable from the drift body, and that abuts against the bush end surface to apply extraction pressure to the bush at the time of "out"; and the drift body. Drive means for feeding and retracting the claw, which is built in the.

In the bush extracting device of the present invention, the work has a void portion formed therein, the bush has a flange only on one end face thereof, and the other end of the bush is provided. Has an end face facing the void of the workpiece; the drift body is inserted into the inner hole of the workpiece with the pawl retracted, and when the pawl reaches the void, the drive means is The claw may be extended from the drift body into the void, and the claw may come into contact with the end surface (the other end surface) of the bush that does not have the brim in the cavity to apply the extracting pressure to the bush.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Next, preferred embodiments of a bush extracting device according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a front sectional view of a bush extracting device according to an embodiment of the present invention. FIG. 2 is a plan view of a rod which is a main constituent member of the bush extracting device of FIG. 3A and 3B are views showing a claw which is a main constituent member of the bush extracting device of FIG. 1, in which FIG. 3A is a front surface and FIG. 3B is a plan view.

As shown in FIG. 1, the bush removing device of this embodiment comprises components such as a drift body 40, a guide cylinder 52, a rod 44, a cam 46, and a claw 48. The cylindrical drift body 40 is formed in such a size that it can be inserted into the inner hole of the bush 30 of the vacuum joint (work) 15.
In addition, a receiving portion 40A connected to the ram 36 of the press machine is formed on the upper portion of the drift body 40. The receiving portion 40A is attached to the ram 36 via a bolt / nut and an adapter (not shown), and the ram 3
The drift body 40 moves up and down as 6 moves up and down. A guide cylinder 42 is inserted into the middle portion of the outer peripheral surface of the drift body 40. The guide cylinder 42 guides the vertical movement of the drift body 40. The tip (lower end) of the drift body 40 has a chamfered tapered introduction portion 40.
It is B.

Further, inside the drift body 40, the claws 4 are
The rod 4 is used as a driving unit for performing the feeding operation of
4, a cam 46, etc. are built in. The rod 44 is a rod-shaped member that extends vertically, and is supported in the drift body 40 so as to be vertically movable by an oilless bush 50 fitted in the drift body 40. As shown in FIG. 2, a claw mounting portion 44A around which claws are arranged is formed on the lower end side (right side in the figure) of the rod 44, and a spring is mounted on the upper end side (left side in the figure). A spring support portion 44B is formed. Further, the spring support portion 4
On the right side of 4B, a cam receiving portion 44E with which the cam 46 abuts
(Cut off in a groove shape) is formed. A tapered portion 44C is formed in a portion closer to the center from the pawl mounting portion 44A. In addition, a male threaded screw portion 44D is formed on the leftmost tip of the pawl mounting portion 44A.

As shown in FIG. 1, the claw 48 is incorporated in a lower stage inside the drift body 40. Then, as shown in FIG. 3B, the four claws 48 are arranged so as to surround the claw mounting portion 44A of the rod 44 described above. When the rod 44 moves downward, the insides of these claws 48 are pushed by the taper portion 44C of the rod, and these claws 48 are extended outward (in the direction of arrow B). In addition, a support member 45 that supports the claw 48 is provided at the tip of the rod 44 with the nut 43.
It is attached using. As shown in FIG. 3A, a rounded curved surface is formed on the upper end 48A inside the claw 48. The taper portion 44C of the rod 44 is in contact with the upper end 48A, and when the rod 44 moves downward, the claw 48 is pushed by the taper portion 44C and is extended to the outside. The taper portion 44C of the rod is formed at an angle of 60 degrees with respect to the axial cross section. Also, nail 4
A rounded curved surface is formed at the lower end 48B of No. 8. When the rod 44 rises, the lower end curved surface 48B is pushed by the inner inclined surface 45A (see FIG. 1) of the support member 45 and moves inward while sliding. As a result, the extended claw 48 is drawn into the drift body 40. As shown in FIG. 3B, the total number of the claws 48 is four in this embodiment, but the number of the claws is not limited to this. However, from the viewpoint of smoothness of extraction, it is preferable to provide a plurality of pieces in axial symmetry.

As shown in FIG. 1, a spring plate 47 is attached to the upper end of the spring support portion 44B above the rod 44. A spring 51 is sandwiched below the spring plate 47,
The spring plate 49 is attached to the inner step portion of the drift body 40. The rod 44 penetrates the central portion of the spring plate 49. The spring 51 biases the entire rod 44 so as to pull it up. The inner end 46A of the cam 46 is fitted and abutted on the cam receiving portion 44E of the rod 44. The cam 46 is rotatably attached to the drift body 40 by a pin 52. The outer end 46B of the cam 46 is normally in a state where the drift body is not descending,
It is located outside the drift body 40. When the drift body 40 descends, the cam outer end 46B moves to the guide cylinder 4
It contacts with 2 and moves upward (simultaneously inward). By this movement, the cam 46 rotates around the pin 52, and the inner end 46A of the cam 46 moves downward.

Next, the operation of the bush extracting device having the above-described structure when it is used will be described. FIG.
It is a side view which shows the state which set the bush extraction apparatus of FIG. 1 in the existing press machine. 5 to 7 are front sectional views showing the progress of the bush extracting work by the bush extracting device of this embodiment. Description will be made with reference to FIG.

As shown in FIG. 4, a drift body 40 is attached to the ram 36 of the press machine 53 via an adapter 54. The guide cylinder that comes to the outside of the drift body is covered with a cover 60. Press machine 53
On the seat plate 56 of No. 5, the stand joint 15 is set and placed on the V block 58. When the ram 36 is lowered in the direction of the arrow A in such a state, as shown in FIG. 1, first, the tip of the drift body 40 is inserted into the inner hole of the bush 30 in the upper part of the vacuum joint 15, and the lower part Into the inner hole of the bush 30 '. At the time of insertion into the upper bush 30, the tapered introduction portion 40B at the tip of the drift body 40 moves the entire waku joint 15 so that the bush 30 of the waku joint 15 is located at the center of the drift body 40. The bush 30 and the drift body 40 are centered. This is because the wax joint 15 is supported on the V block 58 in a free state.

Further, from the state shown in FIG.
As shown in FIG. 5, the outer end 4 of the cam 46
6B contacts the guide tube 42, the cam 46 rotates in the direction of arrow B, and the inner end 46A of the cam 46 pushes down the cam receiving portion 44E of the rod 44 to lower the rod 44. When the rod 44 descends, the tapered portion 44C moves the claw 48 outward (in the direction of arrow C) while contacting the upper end 48A of the claw 48, and moves outward from the surface of the drift body 40, that is, the void portion of the wax joint 15. The claw 48 is extended toward 62. The extended claw 48 comes into contact with the upper end surface (the end surface where the collar is not formed) of the lower bush 30 ′ to apply a withdrawal pressure. Further, as the drift body 40 and the claws 48 descend, as shown in FIG.
0 ′ is pulled out from the pin hole 28. At the time of extraction, the four claws that have been fed out are arranged to face each other, and thus balance with each other, so that force balance is maintained. In addition, rod 4
In No. 4, since only a compressive force is generated in the radial direction and no bending stress works, durability is excellent.

After the bush 30 has been removed, as shown in FIG. 7, the ram 36 is raised in the direction of arrow D and the drift body 40 is pulled up. Then, the cam 46 is separated from the guide tube 42 and becomes free. Therefore, the rod 44 that has descended is pulled upward by the elastic force of the spring 51. When the rod 44 rises, the support member 45
The inclined surface 45A pushes the lower end 48B (see FIG. 1) of the claw 48 to bring the claw 48 inward, so that the claw 4 that has been fed out
8 is automatically drawn into the drift body 40. This completes the extraction work. The bush 30 on the opposite side is extracted by rotating the arm joint 15 and then performing the same operation as described above.

As described above, according to the present embodiment, the bush can be removed by simply lowering the ram in a state of being set in the press machine. Therefore,
There is no need to put your hands under the ram of a press machine, which was required in the past, and as a result, safety is improved. Further, since the troublesome work of inserting the conventional extraction jig and the pushing member is eliminated, the extraction work can be speeded up, and labor saving and efficiency can be achieved.

Although the present invention has been described with reference to the preferred embodiment, the present invention is not limited to this embodiment, and various improvements and changes can be made without departing from the scope of the present invention. is there. For example, in the above-described embodiment, the rod 44 and the cam 4 are used as the driving means for feeding the claw 48.
6, the spring 51 and the like are used, but an electric means such as an electric actuator or a mechanical driving means in which a gear, a ball screw and the like are combined may be used. Furthermore, in the present embodiment, a press machine is used as a means for raising and lowering the drift body 40, but any device may be used as long as it can apply a constant pressure.

[0021]

As described above, according to the present invention,
While improving the safety during the bush removal work,
There is no need for complicated work such as positioning of the extraction jig.
As a result, the bush can be quickly and efficiently removed.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a bush extracting device according to an embodiment of the present invention.

2 is a plan view of a rod that is a main constituent member of the bush extracting device of FIG. 1. FIG.

FIG. 3 is a diagram showing a claw that is a main component of the bush extracting device of FIG.

FIG. 4 is a side view showing a state where the bush extracting device of FIG. 1 is set in an existing press machine.

FIG. 5 is a front cross-sectional view showing the progress of the bush extracting work by the bush extracting device of the present embodiment.

FIG. 6 is a front cross-sectional view showing the progress of the bush extracting work by the bush extracting device of the present embodiment.

FIG. 7 is a front sectional view showing the progress of the bush extracting work by the bush extracting device of the present embodiment.

FIG. 8 is a perspective view showing a connecting body which is a main component of the close contact connector.

FIG. 9 is a perspective view of a shock absorber that is a main component of the close-fitting connector.

FIG. 10 is a perspective view of a wire joint that connects a connecting body and a shock absorber.

FIG. 11 is a cross-sectional view showing a state of a conventional bush extracting work.

[Explanation of symbols]

15 Waku Joint 28, 29 Pin Hole 30 Bushing 30A Collar 36 Ram 40 Drift Body 40B Introducing Section 42 Guide Tube 44 Rod (Driving Means) 44C Tapered Section 44E Cam Receiving Section 46 Cam (Driving Means) 48 Claws 51 Spring 62 Gap

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Susumu Shimizu 1-6-5 Marunouchi, Chiyoda-ku, Tokyo Within East Japan Railway Company (72) Inventor Kanji Kato 3-4-2, Marunouchi, Chiyoda-ku, Tokyo Nihon Kotsu Kikai Co., Ltd.

Claims (3)

[Claims] 1. A bush withdrawing device for withdrawing a cylindrical bush press-fitted into a hole of a work from the work; a drift body insertable into an inner hole of the bush, and a retractable body provided in the drift body. And a pawl that abuts against the bush end surface to apply a withdrawal pressure to the bush at the time of “extending”, and drive means that is built in the drift body and that extends and retracts the pawl. Characteristic bush removing device. 2. The work has a void portion formed therein, the bush has a collar formed only on one end surface thereof, and the other end surface of the bush has a void portion of the work. The drift body is inserted into the inner hole of the work with the claw retracted, and when the claw reaches the cavity, the drive means moves the claw from the drift body to the cavity. 2. The bush extracting device according to claim 1, wherein said pawl is brought out to contact with an end surface (the other end surface) of said bush which does not have a brim in the space to apply an extracting pressure to said bush. 3. The driving means comprises a rod and a cam built in the drift body, the cam rotating as the drift body moves, and the rotation causes the cam to push the rod, whereby The bush extracting device according to claim 1 or 2, wherein a rod drives the pawl to feed the pawl.