JP2001071279A - Bush changing tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bush changing tool for easily mounting/dismounting a bush without a complicated device. SOLUTION: This bush changing tool 1 is provided with a shaft 2 for being inserted into a through hole of a bush, a pressing part 3 provided close to one end 2a of the shaft 2, a holder part 4 which has a storage part 41d storing the bush, is placed for moving toward the pressing part 3 on the shaft 2, and is provided with a contact part 41c on one end 41a which becomes in contact with a bush installation part on which the bush is fitted, and a rotating body 5 which is threadedly engaged with the shaft 2 such that it is positioned on the other end of the holder part 4, and rotates relatively to the shaft 2 to relatively move toward the end 2a and positions the holder part 4 close to the pressing part 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bush changing tool used for attaching or detaching a bush provided in various devices, machines, automobiles and the like.

[0002]

2. Description of the Related Art Conventionally, various devices, machine tools, automobiles and the like are provided with a bush for rotatably or slidably supporting a shaft. Such a bush is generally removably fitted into a bush mounting portion, and is used by replacing it with a new bush when wear, breakage, or the like occurs.

[0003]

However, there are various problems in the bush replacement operation. That is, for example, when exchanging the bush attached to the suspension arm of a car, it is necessary to work with a hydraulic press machine or a special tool such as a large vise installed in a maintenance shop, etc. It was hanging. In addition, depending on the shape or arrangement of the bush and the bush mounting part, these special tools cannot be used as they are, and auxiliary jigs are manufactured according to the shape of the bush, etc., and further, the special tools themselves are modified. In some cases, and lacks versatility. In addition, there is also a problem that the work cost is high because the work is generally difficult and the work requires a long time.

[0004] Therefore, the present invention provides a bush replacement tool that does not require a large-scale device when replacing the bush, allows the bush to be easily attached or detached, and reduces the operating cost. As an issue. Another object of the present invention is to provide a bush replacement tool that can handle various bushes having different shapes and the like.

[0005]

According to a first aspect of the present invention, there is provided a bush changing tool provided with a shaft which can be inserted into a through hole of a bush and near one end of the shaft. An abutting portion having a pressing portion and a housing portion capable of housing the bush, the movable portion being disposed on the shaft toward the pressing portion, and having one end abutting on a bush mounting portion into which the bush is inserted. And a screwed to the shaft so as to be positioned on the other end side of the holder portion, and by being relatively rotated with respect to the shaft, it is relatively moved in one end direction of the shaft. And a rotating body for bringing the holder portion close to the pressing portion. The bush replacement tool according to claim 2 is the bush replacement tool according to claim 1,
A bearing is provided between the holder and the rotating body. A bush replacement tool according to a third aspect is the bush replacement tool according to the first or second aspect, wherein the holder portion is formed of a collar and a base ring, and a tip of the collar abuts on the bush mounting portion. A contact portion is formed, and the hollow portion of the collar functions as a housing portion for the bush. A bush changing tool according to a fourth aspect is the bush changing tool according to the third aspect, wherein a window is formed on a peripheral wall of the hollow portion of the collar so that the inside of the hollow portion can be observed from the outside. And A bush replacement tool according to a fifth aspect is the bush replacement tool according to the third or fourth aspect, wherein at least a collar of the holder portion is replaceable.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an overall configuration diagram showing a bush replacement tool 1 according to one embodiment of the present invention. As shown in the figure, the bush changing tool 1 includes a shaft 2, a pressing portion 3, a holder 4, and a rotating body 5. The bush exchange tool 1 is suitable for attaching or detaching a bush provided on a suspension arm of an automobile.

[0007] In order to ensure the versatility of the bush changing tool 1, the shaft 2 is set to have a length corresponding to the shape of the suspension arm that differs depending on the vehicle type, and the diameter of the shaft 2 is determined by the bush. Even when the inside diameters are different, the through holes formed in the various bushes are set smaller than the inside diameters of the through holes formed in the various bushes so that the shaft 2 can be inserted through those through holes.

In this embodiment, the outer screw 2c is formed over substantially the entire outer periphery of the shaft 2,
A pressing portion 3 to be described later can be screwed near the one end 2a, and a rotating body 5 to be described later can be screwed to the other end 2b side.

The other end 2b of the shaft 2 is provided with a projection 2d for restricting the shaft 2 from rotating as required when replacing the bush. The protrusion 2d is formed in a polygonal cross section so that a tool such as a spanner can be engaged.

As the shaft 2, for example, FIG.
As shown in the figure, the small-diameter portion 21 extending from the middle to the one end 2a, and having a diameter larger than the small-diameter portion 21,
It is also possible to use one having a large-diameter portion 22 extending from the middle to the other end 2b. in this case,
The diameter of the small diameter portion 21 is set smaller than the inner diameter of the through hole formed in the various bushes, and the length is set to be smaller than the inner diameter of the through hole formed in the various bushes.
It is preferable to set the length in the axial direction longer than the maximum length. Accordingly, it is possible to cope with various bushes having different inner diameters and axial lengths of the through holes. In addition, the small diameter portion 21 has an external screw 2c only in the vicinity of one end 2a where a pressing portion 3 described later can be disposed.
What is necessary is just to be formed. Also, by increasing the diameter of the large-diameter portion 22, the moving distance per rotation of the rotating body 5 described later, which relatively moves in the direction of the one end 2a of the shaft 2, is increased. The number of rotations of the rotating body 5 can be reduced, and work efficiency can be improved.

The pressing portion 3 comprises a nut 31 and a washer 32. And the washer 32 is the nut 31
First, the shaft 2 is inserted into the hole of the washer 32, and then the nut 31 is screwed into the external screw 2c formed near the one end 2a of the shaft 2 so as to be disposed inside. The shaft 2 is detachably disposed near one end 2a. Thereby, when attaching the bush to the bush attaching portion, the pressing portion 3 can be removed from the shaft 2 and the bush can be quickly set on the shaft 2, while when removing the bush from the bush attaching portion, the shaft 2 can be attached. By removing the pressing portion 3, the one end 2a side of the shaft 2 can be quickly inserted into the through hole of the bush, so that work efficiency can be improved.

The pressing portion 3 is preferably one that can be freely attached to and detached from the shaft 2 as in the present embodiment. However, as long as it can press the bush, its shape and structure are not limited. It is not limited.

The holder section 4 includes a collar 41 and a base ring 42. The collar 41 has an inner diameter larger than an outer diameter of the bush and a length in the axial direction of the bush so as not to hinder the progress of the removed bush when the bush is removed from the bush mounting portion. It is formed in a substantially cylindrical shape having a hole (hollow portion) 41d longer than the hole. And this hollow part 41d functions as an accommodating part which can accommodate the removed bush.

Further, the peripheral wall of the hollow portion 41d has a structure shown in FIG.
As shown in the figure, the peripheral wall is moved from the front end 41a to the rear end 41b
There is provided a window 41e formed by cutting out in a substantially U-shape in the direction, so that even when the collar 41 is brought into contact with the bush mounting portion, the inside of the collar 41 (hollow portion 41) is formed.
d) can be observed from the outside. For example, when the bush is removed from the bush mounting portion, the collar 41 is kept in contact with the bush mounting portion.
The state of pulling out the bush can be confirmed.

The front end 41a of the collar 41 is provided with a groove 41c as a contact portion for contacting the bush mounting portion. This groove 41c is provided at the tip 41a of the collar 41.
The collar 41 is engraved along the inner peripheral direction, and when the collar 41 is brought into contact with the bush mounting portion,
The edge of the bush mounting portion is fitted. This allows
When replacing the bush, the collar 41 can be stably arranged without being loosened on the bush mounting portion.

On the other hand, the base ring 42 is formed in a ring shape having an outer diameter larger than the inner diameter of the collar 41 and an inner diameter larger than the outer diameter of the shaft 2. The base ring 42 is connected to one end 2 a of the shaft 2 of the rotating body 5 described later.
Although it functions as a wall for preventing movement in the direction, if the outer diameter of the rotating body 5 is larger than the inner diameter of the collar 41 described above, the collar can be provided without disposing the base ring 42. Since such a function is satisfied only by 41, it is also possible to configure the holder portion 4 only by the collar 41.

The holder 4 formed of the collar 41 and the base ring 42 has a hollow portion 41d of the collar 41 and a hole of the base ring 42 so that the base ring 42 is disposed on the rear end 41b side of the collar 41. When the shaft 2 is inserted through the shaft 2, the shaft 2 is movably disposed from the other end 2 b of the shaft 2 toward the pressing portion 3.

The holder 4 is provided with one end (a groove 41c formed in the tip 41a of the collar 41) in contact with the bush mounting portion, so that when the bush is to be mounted or removed, the bush is mounted. When the rotating body 5 described later is relatively rotated with respect to the shaft 2 without hindering the progress of the rotation, the rotating body 5 itself is prevented from moving in the direction of one end 2a of the shaft 2. It is responsible for work. Therefore, the holder part 4 has an accommodation part capable of accommodating the bush in order to fulfill such a role.
The configuration is not limited in any way as long as it has a contact portion that contacts the bush mounting portion.

In general, the shape of the bush (the outer diameter and the length in the axial direction) differs depending on the type of vehicle and the purpose of disposition, but the holder portion 4 previously formed according to the shape of various bushes. Alternatively, the color 41 can be prepared, and these can be exchanged appropriately for use.

The rotating body 5 is formed in a polygonal cross section having a screw hole formed with an internal screw which can be screwed into an external screw 2c formed on the outer periphery of the shaft 2. It is screwed to the shaft 2 so as to be located on the side of the base ring 42 constituting the other end.

The rotating body 5 may be disposed so as to be in direct contact with the base ring 42 constituting the holder portion 4.
When the rotating body 5 is in direct contact with the base ring 42, the rotating body 5 and the base ring 42
Therefore, a considerable force is required to rotate the rotating body 5. Therefore, in order to rotate the rotating body 5 with a smaller force, the base ring 42 and the rotating body 5 are rotated.
For example, it is preferable to dispose a thrust bearing 6 including a plurality of spheres 6a. It is more preferable to form the thrust bearing 6 and the rotating body 5 integrally, since a slight friction generated between the thrust bearing 6 and the rotating body 5 can be eliminated.

As shown in FIG. 8, the tip 5a of the rotating body 5 is formed in a substantially cylindrical shape, and the tip 5a is fitted into a hole of a radial bearing 6 'having a plurality of spheres 6a'. The rotating body 5 may be rotated with a small force by being inserted.

The bush changing tool 1 configured as described above is used as follows. That is, when removing the bush 7 inserted into the bush mounting portion 8a of the suspension arm 8 of the automobile, first, as shown in FIG. 3, the pressing portion 3 (the nut 31 and the washer 3) is previously removed.
The one end 2a side of the shaft 2 from which 2) has been removed is inserted into the through hole 7a of the bush 7. Next, a washer 32 and a nut 31 constituting the pressing portion 3 are sequentially attached to one end 2a of the shaft 2 protruding from one end surface of the bush 7. Next, the groove 41c formed in the front end 41a of the collar 41 constituting the holder portion 4 is brought into contact with the bush mounting portion 8a such that the edge 8b of the bush mounting portion 8a is fitted into the groove 41c. Let it. Thereby, the color 4
1 is stably arranged on the bush mounting portion 8a. next,
The rotating body 5 is rotated, and the rotating body 5 is connected to one end 2 of the shaft 2.
The collar 41, the base ring 42, the thrust bearing 6, and the rotating body 5 are brought into contact with each other by moving in the direction a (the direction of arrow A).

Then, in this state, the rotating body 5 is rotated using a tool such as a spanner. In this case, the other end 2 of the shaft 2 is previously set so that the rotating body 5 can rotate reliably.
It is desirable that a tool such as a wrench is engaged with the protrusion 2d protruding from the position b to prevent the shaft 2 from rotating. By rotating the rotating body 5 in this manner, the rotating body 5 tends to move in the direction of arrow A by the screwing action of the inner screw formed inside the outer screw 2c of the shaft 2, The movement is prevented by the holder portion 4 (the collar 41 and the base ring 42) in contact with the bush mounting portion 8a. Therefore, the shaft 2
The slider 3 is slid in the direction of arrow B so as to be attracted to the rotating body 5, so that the pressing portion 3 moves in the direction approaching the holder portion 4 while pressing the bush 7. As a result, as shown in FIG. 4, the bush 7 is pushed out from the bush mounting portion 8a and is housed in the housing portion (hollow portion 41d of the collar 41) of the holder portion 4, whereby the removal is completed.

On the other hand, when the bush 7 is mounted on the bush mounting portion 8a, first, as shown in FIG. 5, the one end 2a side of the shaft 2 from which the pressing portion 3 has been removed is inserted into the bush mounting portion 8a. Then, the bush 7 is attached to the shaft 2 so that the bush 7 is set on one side of the bush attachment portion 8a. Next, in this state, a washer 32 and a nut 31 constituting the pressing portion 3 are sequentially mounted near one end 2a of the shaft 2 protruding from one end surface of the bush 7. Next, the holder unit 4
Groove 41 formed at the tip 41a of the collar 41 constituting
c is brought into contact with the bush mounting portion 8a such that the edge portion 8b of the bush mounting portion 8a is fitted into the groove 41c, and the rotating body 5 is rotated. The collar 41, the base ring 42, the thrust bearing 6, and the rotating body 5 are brought into contact with each other by moving in the direction 2a (the direction of arrow A).

Then, in this state, as in the case of the above-described detachment, by rotating the rotating body 5, the pressing portion 3 moves in the direction (arrow B direction) approaching the holder portion 4 while pressing the bush 7. Then, as shown in FIG. 3, the bush 7 is inserted into the bush mounting portion 8a, whereby the mounting is completed. In the above-described method of attaching or detaching the bush 7, the rotating body 5 is rotated. However, the rotating body 5 only needs to rotate relatively to the shaft 2, and therefore, the rotation of the rotating body 5 is restricted. Then, the shaft 2 may be rotated.

On the other hand, as shown in FIG. 6, depending on the shape of the bush 7, its mounting direction is one direction (arrow C direction).
And the two bush mounting portions 8a ', in which the suspension arm 8 is close to each other,
When the bush 7 is attached to one of the bush attachment portions 8a 'in the case of having the bush attachment portion 8a ", the shaft 2 is first connected to the two bush attachment portions 8a', 8
a ”. Next, the bush 7 and the pressing portion 3 are respectively attached to the one end 2a side of the shaft 2. Next, the holder portion 4 is brought into contact with the other bush attachment portion 8a ″. Even if the collar 41 is not provided, a space is formed between the two bush mounting portions 8a 'and 8a "so as not to hinder the advance of the bush 7, so that the holder portion 4 is constituted only by the base ring 42. do it,
The base ring 42 is brought into contact with the other bush mounting portion 8a ″. Next, the rotating body 5 is rotated, and the rotating body 5 is moved in the direction of the one end 2a of the shaft 2, so that the base ring 42, the thrust bearing The bush 7 can be attached by rotating the rotating body 5 in this state where the rotating body 5 and the rotating body 5 are in contact with each other.

Next, when the bush 7 is mounted on the other bush mounting portion 8a ", the suspension arm 8 is turned upside down, and the two bush mounting portions 8a 'and 8a" are arranged in reverse. The shaft 2 is inserted into the through hole 7a of the bush 7 inserted into the one bush mounting portion 8a 'and into the other bush mounting portion 8a ".
Next, the bush 7 and the pressing portion 3 are attached to one end 2a of the shaft 2 respectively. Next, in this case, since the previously mounted bush 7 protrudes from the end of the one bush mounting portion 8a ', the base ring 42 contacts the bush 7 inserted into the one bush mounting portion 8a'. Contact Next, by rotating the rotating body 5 and moving the rotating body 5 in the direction of one end 2a of the shaft 2, the base ring 42, the thrust bearing 6, and the rotating body 5 are brought into contact with each other. By rotating the rotating body 5, the bush 7 can be attached.

The two bush mounting portions 8a ', 8
When removing the bush 7 inserted in a ″, the bush 7 can be individually removed by the same method as the above-described method of removing the bush (see FIGS. 3 and 4).

As described above, according to the bush changing tool 1, the operation of merely rotating the rotating body 5 relative to the shaft 2 while the shaft 2 is inserted through the through hole of the bush or the bush mounting portion. Thus, the bush can be easily or efficiently attached or detached. As a result, it is possible to greatly reduce the operation cost for replacing the bush. In addition, even when the shape of the bush and the bush mounting portion are different, it is possible to cope with the case by changing a collar formed into a shape suitable for the bush and the like, so that the versatility is excellent. In addition, since it is small and lightweight, it can be carried around and work can be performed anywhere.

Further, the bush replacement tool 1 is applicable not only to the replacement of the bush provided on the suspension arm of an automobile, but also to the replacement of the bush provided on various devices and machinery.

[0032]

As described above, according to the bush changing tool of the present invention, when exchanging the bush, a large-scale device is not required and the shaft is inserted into the through hole of the bush or the bush mounting portion. Thus, the bush can be easily or efficiently attached or removed only by rotating the rotating body relative to the shaft. As a result, it is possible to greatly reduce the operation cost for replacing the bush 7. In addition, since the bearing is provided between the holder and the rotating body, the rotating body can be rotated with a small force without requiring a large force. In addition, since at least the collar of the holder portion is replaceable, even when the shape of the bush or the bush mounting portion is different, it is possible to cope by replacing the collar formed into a shape that matches the bush or the like. Since it is possible, versatility can be improved. In addition, since it is small and lightweight and can be carried around, work can be performed anywhere.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing a bush changing tool according to an embodiment of the present invention.

FIG. 2 is a side view showing a collar.

FIG. 3 is a diagram for explaining how to use a bush replacement tool.

FIG. 4 is a diagram for explaining how to use a bush replacement tool. .

FIG. 5 is a diagram for explaining how to use a bush replacement tool.

FIG. 6 is a diagram for explaining how to use the bush replacement tool.

FIG. 7 is a side view showing another embodiment of the shaft.

FIG. 8 is a sectional view showing another embodiment of the rotating body and the bearing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bush exchange tool 2 Shaft 3 Press part 31 Nut 32 Washer 4 Holder part 41 Collar 42 Base ring 5 Rotating body 6 Thrust bearing 7 Bush 8 Suspension arm 8a Bush mounting part

Claims (5)

[Claims] 1. A shaft that can be inserted through a through hole of a bush, a pressing portion provided near one end of the shaft, and a housing portion that can house the bush, and the shaft faces the pressing portion. A holder portion provided with a contact portion that abuts a bush mounting portion into which the bush is inserted at one end, and is screwed to the shaft so as to be located at the other end side of the holder portion, A rotating body that relatively moves toward one end of the shaft by rotating relative to the shaft to bring the holder portion closer to the pressing portion. . 2. The bush replacement tool according to claim 1, wherein a bearing is disposed between the holder and the rotating body. 3. The bush changing tool according to claim 1, wherein the holder portion includes a collar and a base ring, and a contact portion that contacts the bush mounting portion is formed at a tip of the collar. And a hollow part of the collar functions as a housing part for the bush. 4. The bush changing tool according to claim 3, wherein a window through which the inside of the hollow portion can be observed from outside is formed on a peripheral wall of the hollow portion of the collar. 5. The bush replacement tool according to claim 3, wherein at least a collar of the holder portion is replaceable.