JP2000291671A - Bearing removal jig - Google Patents

Abstract

(57) [Summary] (with correction) [PROBLEMS] To provide a jig capable of easily and easily removing a bearing from a shaft hole. SOLUTION: An insertion portion 6 which can be inserted into a shaft hole C of a base B at a tip portion of a ball shaft 4 formed long.
A central hole 13 is formed inside the insertion portion 6, and at least one support hole 8 is formed in the insertion portion 6;
Accommodates a ball 7, a core 14 is slidably inserted into a center hole 13, a small diameter portion 16 and a large diameter portion 17 are formed in the core 14, and the diameter of the ball 7 is smaller than that of the small diameter portion 16. Although it is shorter than the distance between the outer peripheral surface and the outer peripheral surface of the insertion portion 6, the large-diameter portion 17
When the large-diameter portion 17 is opposed to the support hole 8, the ball 7 abuts on the large-diameter portion 17 and a part of the ball is inserted into the insertion portion. 6. A jig for removing a bearing configured to protrude outward from the outer peripheral surface of 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig for removing a bearing.

[0002]

FIG. 1 shows the relationship between a conventional general bearing and a shaft hole. A bearing A is attached to one or both ends of a shaft hole C formed in a base B. FIG. The bearing A attached to the shaft hole C may be removed and replaced by regular maintenance.

[0003]

However, replacement of the bearing A for maintenance due to maintenance may be very troublesome. That is, as shown in FIG. 1, in the case where the inner surface of the bearing A is substantially flush with the inner surface of the shaft hole C,
There is no effective means or method for removing the bearing A. Conventionally, an elongated tool such as a screwdriver is inserted from the opposite side of the shaft hole, and its tip is connected to the bearing A and the shaft hole C.
Although the method of applying to the slight gap D formed between them and then digging out with a screwdriver is adopted, this operation is troublesome and difficult to perform.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a jig capable of easily and simply removing a bearing from a shaft hole.

[0005]

Therefore, according to the present invention, an insertion portion 6 that can be inserted into a shaft hole C of a base B is formed at the tip of a long ball shaft 4 and the inside of the insertion portion 6 is formed. Is formed with a central hole 13 penetrating the insertion portion 6 in the longitudinal direction. The insertion portion 6 extends in the radial direction of the insertion portion 6 and has an inner end communicating with the center hole 13 and an outer end thereof. At least one support hole 8 opening at the outer peripheral surface 21 of the insertion portion 6 is formed, the ball 7 is housed in the support hole 8, and a core 14 is slidably inserted into the center hole 13. The core 14 has a small diameter portion 16 and a large diameter portion 17 that can selectively face the support hole 8 when the core 14 is slid with respect to the insertion portion 6. The diameter of the ball 7 is The small-diameter outer peripheral surface of the small-diameter portion 16 and the outer peripheral surface 2 of the insertion portion 6 Shorter than the distance between, but the large-diameter portion 17
When the large-diameter portion 17 faces the support hole 8, the ball 7 comes into contact with the large-diameter portion 17. Thus, a bearing removal jig is configured such that a part 22 thereof projects outward from the outer peripheral surface 21 of the insertion portion 6. Further, according to the present invention, in the jig, a screw groove 10 is formed on an outer peripheral surface of the ball shaft 4, and the screw groove 1 is formed.
Reference numeral 0 denotes a bearing removal jig in which the rotation lever 23 is screwed. Further, in the present invention, in the jig, the ball shaft 4 is slidably supported in the through hole 3 of the hollow body 1, and an abutting surface 2 abutting on the base B is formed at one end of the hollow body 1. And the hollow body 1
At the other end, a bearing removal jig having a bearing 28 in contact with the rotary lever 23 is mounted. Further, in the present invention, in the jig, the support hole 8 and the ball 7 housed therein are formed as a plurality of bearing removal jigs provided at intervals in the circumferential direction of the insertion portion 6. is there.

[0006]

An embodiment of the present invention will be described with reference to the drawings. The configuration of the bearing A and the like shown in FIG. 1 will be used as it is in the description of the jig according to the present invention. Reference numeral 1 denotes a hollow body of the jig according to the present invention, which has an annular contact portion 2 formed at one end (tip) and a through hole 3 provided therein. A long ball shaft 4 having a hollow and circular cross section is slidably inserted into the through hole 3. At one end of the ball shaft 4, an insertion portion 6 having a slightly smaller diameter is integrally formed via a step portion 5.

The insertion portion 6 is a portion to be inserted into the shaft hole C of the base B in FIG. 1, and a plurality of balls 7 are mounted substantially at the center in the length direction. The balls 7 are arranged at equal intervals in the circumferential direction of the insertion portion 6, and preferably three balls are provided. The ball 7 is housed in a radial support hole 8 formed in the insertion portion 6. At the outer end of the support hole 8, as shown in FIG. 7, a ball retaining projection 9 is formed by caulking or the like. A screw groove 10 is formed in the outer peripheral portion of the other end (rear end) of the ball shaft 4. Numeral 11 denotes a key groove formed in the ball shaft, and numeral 12 denotes a screw slidably engaged with the key groove.

A center hole 13 is provided in the ball shaft 4 to penetrate in the axial direction. A core 14 having an elongated circular cross section is slidably inserted into the center hole 13. A step 15 is formed on the tip side of the core 14. The step portion 15 includes a small diameter portion 16 and a large diameter portion 17.
A small-diameter taper portion 18 between the small-diameter portion 16 and the large-diameter portion 17, and a large-diameter taper portion 20 connecting the large-diameter portion 17 and the outer peripheral surface 19 of the core 14. . The diameter of the ball 7 is short between the outer peripheral surface of the small diameter portion 16 and the outer peripheral surface 21 of the insertion portion 6, but the diameter of the ball 7 is smaller than the outer peripheral surface of the large diameter portion 17 and the outer peripheral surface of the insertion portion 6. Make it longer than the distance. Thus, when the small diameter portion 16 of the core 14 faces the support hole 8 as shown in FIG. 3, the ball 7 moves inward and does not project outside the outer peripheral surface 21 of the insertion portion 6. . However, as shown in FIG.
When the ball 7 faces the support hole 8, the ball 7
The part 22 is pushed outward by the contact with the outer peripheral surface 21 of the insertion part 6 and protrudes outward.

A rotary lever 23 is screwed into the screw groove 10 of the ball shaft 4. A cap 24 is attached to the rear end of the core 14, and a spring 25 is interposed between the cap 24 and the rear end of the ball shaft 4.
26 is a stopper attached to the tip of the core 14;
7 is a holding handle attached to the body 1, and 28 is a bearing.

[0010]

The jig according to the present invention is in the state shown in FIG. 2 when not in use, and in use, grasps the holding handle 27 and pushes the cap 24 with the thumb to push the core 14 against the elasticity of the spring 25 so that the tip is Push out to the side. Then, the small diameter portion 16 of the core 14
Is positioned to face the ball 7, and in this state, the tip of the core 14 and the insertion portion 6 are inserted into the shaft hole C of the base B as shown in FIG. In this state, since the ball 7 is retracted into the support hole 8, the insertion portion 6 can be smoothly inserted without any resistance.
Can be inserted into the shaft hole C.

[0011] As shown in FIG.
The ball 7 is inserted to a position deeper than the slight gap D formed between the bearing A and the shaft hole C. When the thumb is removed from the cap 24 in this state, the core 14 moves rearward with respect to the ball shaft 4 by the elastic force of the spring 25 until the small-diameter taper portion 18 comes into contact with the ball 7. An elastic force of 25 and a force to fly outward act on the tapered portion 18. In this state, when the holding handle 27 is pulled forward to a position where the ball 7 faces the gap D, the ball 7 projects outward by the gap D and engages with the gap D with a sense of articulation. . When the ball 7 engages with the gap D, the ball 7 moves to a position not affected by the small diameter taper portion 18, whereby the core 14 moves further rearward by the elastic force of the spring 25, and the ball 7 After riding on the large-diameter portion 17, the large-diameter taper portion 20 comes into contact with the ball 7, and the state of FIG. 4 is completed.

In the state shown in FIG. 4, the outer end 22 of the ball 7 projects outward from the outer peripheral surface 21 of the insertion portion 6 due to the contact with the large diameter portion 17. As long as the contact is maintained, the engagement between the ball 7 and the gap D is not released. Therefore, in the state shown in FIG. 4, when the rotation lever 23 is rotated to pull out the ball shaft 4, the hollow body 1 is initially relatively moved to the base B
When the ball slide 4 slides to the side, the annular contact portion 2 of the hollow body 1 contacts the base B, and the rotating lever 23 is further rotated, the ball shaft 4 is pulled out toward the base B this time. When the ball shaft 4 is pulled out in this way,
The bearing A is pulled out of the shaft hole C by engagement with the ball 7. At this time, in the jig according to the present invention, since a plurality of balls (preferably three) are provided at equal intervals in the circumferential direction of the insertion portion 6, the force in the direction of pulling out the bearing A is The bearing A can be easily and easily removed quickly, and the rotating lever 23 can be rotated by the bearing 28 with a small force.

[0013]

As described above, according to the present invention, the insertion portion 6 that can be inserted into the shaft hole C of the base B is formed at the tip of the long ball shaft 4. A center hole 13 penetrating the insertion portion 6 in the length direction is formed, and the insertion portion 6 extends in a radial direction of the insertion portion 6, and has an inner end communicating with the center hole 13 and an outer end thereof having the above-described shape. At least one support hole 8 opening on the outer peripheral surface 21 of the insertion portion 6 is formed, the ball 7 is accommodated in the support hole 8, and a core 14 is slidably inserted into the center hole 13. When the core 14 is slid with respect to the insertion portion 6, a small-diameter portion 16 and a large-diameter portion 17 that can selectively face the support hole 8 are formed on the child 14, and the diameter of the ball 7 is The distance between the small diameter outer peripheral surface of the small diameter portion 16 and the outer peripheral surface 21 of the insertion portion 6 Although shorter, the distance between the large-diameter outer peripheral surface of the large-diameter portion 17 and the outer peripheral surface 21 of the insertion portion 6 is made longer. Part 2 due to contact with large diameter part 17
2 is a jig for removing the bearing configured to protrude outward from the outer peripheral surface 21 of the insertion portion 6,
When the insertion portion 6 is inserted into the shaft hole C, it is possible to engage the small gap D formed between the bearing A and the shaft hole C with the ball 7 riding on the large diameter portion 17. Since the ball shaft 4 can be
, The bearing A can be pulled out from the shaft hole C only by pulling it out. In addition, the present invention provides a bearing removal jig in which a screw groove 10 is formed on the outer peripheral surface of the ball shaft 4 and a rotary lever 23 is screwed into the screw groove 10. Therefore, the ball shaft 4 can be easily pulled out by rotating the rotation lever 23. Further, in the present invention, in the jig, the ball shaft 4 is slidably supported in the through hole 3 of the hollow body 1, and an abutting surface 2 abutting on the base B is formed at one end of the hollow body 1. The other end of the hollow body 1 is a bearing removal jig having a bearing 28 attached to the rotating lever 23.
The rotation lever 23 can be rotated with a light force. Further, in the present invention, in the jig, the support hole 8 and the ball 7 housed therein are formed as a plurality of bearing removal jigs provided at intervals in the circumferential direction of the insertion portion 6. Therefore, the force for pulling out the ball shaft 4 can be evenly transmitted to the bearing A.

[Brief description of the drawings]

FIG. 1 is a diagram showing a relationship between a bearing and a shaft hole.

FIG. 2 is a partially longitudinal side view of a jig according to the present invention.

FIG. 3 is a partially longitudinal side view showing a state where an insertion portion of the jig is inserted into a shaft hole of a base.

FIG. 4 is an enlarged sectional view showing a state where a ball is engaged with a gap.

FIG. 5 is a side view of a ball shaft.

FIG. 6 is a side view of the core.

FIG. 7 is an enlarged view of a waist.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Hollow body, 2 ... Contact part, 3 ... Through hole, 4 ... Ball shaft, 5 ... Step part, 6 ... Insertion part, 7 ... Ball, 8 ... Support hole, 9 ... Projection, 10 ... Screw part, 11 … Keyway, 12…
Screw, 13: Center hole, 14: Core, 15: Step, 16
... Small diameter part, 17 ... Large diameter part, 18 ... Small diameter taper part, 19
... outer peripheral surface, 20 ... large diameter taper portion, 21 ... outer peripheral surface, 22
... part, 23 ... rotating lever, 24 ... cap, 25 ... spring, 26 ... stopper, 27 ... holding handle, 28 ... bearing.

Claims (4)

[Claims] An insertion portion (6) insertable into a shaft hole (C) of a base (B) at a tip of a long ball shaft (4).
And a central hole 13 is formed inside the insertion portion 6 so as to penetrate the insertion portion 6 in the length direction. The insertion portion 6 extends in the radial direction of the insertion portion 6 and has an inner end. At least one support hole 8 communicating with the center hole 13 and having an outer end opened at the outer peripheral surface 21 of the insertion portion 6 is formed.
, The ball 7 is housed therein, a core 14 is slidably inserted into the center hole 13, and the core 14 is inserted into the core 14.
Is slid with respect to the insertion portion 6, the support hole 8
Small diameter portion 16 and large diameter portion 17 that can selectively face
The diameter of the ball 7 is shorter than the distance between the small-diameter outer peripheral surface of the small-diameter portion 16 and the outer peripheral surface 21 of the insertion portion 6, but the large-diameter outer surface of the large-diameter portion 17 and the diameter of the insertion portion 6 are smaller. When the large diameter portion 17 is opposed to the support hole 8 by making the distance longer than the distance from the outer peripheral surface 21, the ball 7 is moved to the large diameter portion 1.
A bearing removal jig configured such that a portion thereof protrudes outward from the outer peripheral surface of the insertion portion by contact with the bearing. 2. A bearing removal jig according to claim 1, wherein a screw groove is formed on an outer peripheral surface of said ball shaft, and a rotary lever is screwed into said screw groove. 3. The ball shaft 4 according to claim 2, wherein the ball shaft 4 is slidably supported in a through hole 3 of the hollow body 1, and an abutment surface 2 for abutting on the base B is formed at one end of the hollow body 1. A bearing removal jig having a bearing 28 attached to the other end of the hollow body 1 to be in contact with the rotating lever 23. 4. The support hole 8 and the ball 7 stored in the support hole 8 according to claim 1,
Is a jig for removing bearings provided at intervals in the circumferential direction of the insertion portion 6.