JPH06672U - Ball bearing extraction tool - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention relates to a ball bearing extraction tool used for repairing equipment having a ball bearing such as an electric tool. Even if the inner ring is damaged and lost, the outer ring can be used. It is possible to use and extract. According to the present invention, a through hole 1a, a female screw 1b, a slot 1c, a sleeve 1 on which a protrusion 1d and a rotation locking portion 1E are formed, a shaft 2a, a male screw 2b and a through hole 2 are provided.
A shaft 2 having a C formed therein is provided so as to be able to advance. When the shaft 2 advances, a push rod 3 attached to the tip of the sleeve 1 pushes the outer frame 6 and engages with the protrusion 1d. Are extruded from the outer frame 6.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a ball shaft receiving / extracting tool for extracting a bearing, which is press-fitted into an outer frame part like an electric power tool.

[0002]

[Prior art]

 Conventionally, this type of tool has been a tool for pulling out a ball bearing that shares an inner and outer ring from an outer frame such as a housing.

[0003]

[Problems to be solved by the device]

 In the conventional ball bearing extraction tool, the outer frame was heated while the ball bearing was press-fitted to create a state in which the press-fitting tightening margin was reduced due to the difference in thermal expansion of the material, and the ball bearing was removed by the method of knocking out the ball bearing. However, since there is no tool to extract the ball bearings with only the outer ring, in such a case, the usable outer frame should be discarded and replaced with a new one. Therefore, in the former case, there is a problem that it takes time and labor, and equipment such as a furnace is required, and in the latter case, repair costs increase and reusable materials are treated as waste. An object of the present invention is to solve the above problems and to provide an extraction tool which can easily extract even a ball bearing having only an outer ring.

[0004]

[Means for Solving the Problems]

 The above object is achieved by constructing a member for holding the inner circumference of the ball bearing outer ring and a member for pushing out the outer frame into which the ball bearing outer ring is press fitted.

[0005]

[Action]

 In the ball bearing extraction tool configured as described above, the member that holds the ball bearing outer ring engages with the groove of the ball raceway surface of the ball bearing outer ring to grasp. The member for pushing the outer frame operates so as to push the bottom of the bearing chamber of the outer frame, into which the ball bearing is press-fit, to the outer ring of the ball bearing.

[0006]

【Example】

 Hereinafter, the present invention will be described with reference to the accompanying drawings. The extraction tool of the present invention comprises a sleeve 1, a shaft 2 and a push rod 3 shown in FIGS. The sleeve 1 is made of a cylinder and has a female thread 1b in the middle of the through hole 1a, a slot 1c with one end cut off at a position including the through hole 1a, and a tip of the slot 1c on the spherical raceway surface of the outer ring 5. A protrusion 1d having an engaging shape is formed. Further, a rotation locking portion 1E having a hexagonal cross section for preventing rotation is formed on the outer periphery of the upper end.

The shaft 2 is provided with a shaft portion 2a and a male screw 2b which are loosely engaged with and screw-fitted into a through hole 1a and a female screw 1b of the sleeve 1, and a hole 2c which penetrates in a radial direction at an upper end thereof. The push rod 3 is formed of a cylinder, and an annular groove is formed in the slit and in the radial direction. The push rod 3 is loosely engaged with the protrusion 1d of the sleeve 1, and then retained by the O-ring 4.

In the structure described above, first, the protrusion 1d of the sleeve 1 is bent to the inner peripheral portion as shown in FIG. 1, and the protrusion 1d is inserted into the ball raceway surface of the ball bearing outer ring 5 as shown in FIG. To do. Next, the shaft 2 is put into the sleeve 1, and is screwed in via the push rod 3 until the shaft 2 comes into contact with the housing 6. After that, a spanner or the like is applied to the rotation locking portion 1E of the sleeve 1, and a screwdriver or the like is passed through the through hole 2C of the shaft 2 to rotate the ball bearing outer ring 5 by a screw lead as shown in FIG.

[0009]

[Effect of device]

 According to the present invention, since the sleeve for holding the outer ring of the ball bearing and the shaft for advancing by screwing on the sleeve are arranged, the ball bearing having only the outer ring can be removed.

[Brief description of drawings]

FIG. 1 is a sectional view showing a state before a sleeve is inserted into a ball bearing by the ball bearing extracting tool of the present invention.

FIG. 2 is a sectional view showing a state after the sleeve is inserted into the ball bearing by the ball bearing extracting tool of the present invention.

FIG. 3 is a sectional view showing a state in which the shaft is inserted into the sleeve and the ball bearing outer ring is pulled out.

FIG. 4 is a sectional view showing an embodiment of a sleeve which is a component of the ball bearing extraction tool of the present invention.

FIG. 5 is a front view showing an embodiment of a shaft which is a component of the ball bearing extracting tool of the present invention.

6 is a cross-sectional view taken along the line AA of FIG.

FIG. 7 is an explanatory cross-sectional view showing a state in which only the outer ring of the ball bearing remains.

[Explanation of symbols]

1 is a sleeve, 1a is a through hole, 1b is a female thread, 1c is a slot, 1d is a protrusion, 1E is a rotation locking part, 2 is a shaft, 2a is a shaft, 2b is a male thread, 2C is a through hole, and 3 is a push. A bar, 4 is an O-ring, 5 is a ball bearing outer ring, and 6 is a housing.

Claims (1)

[Scope of utility model registration request] 1. A cylinder having a through hole partially formed with an internal thread, a slotted portion provided at the tip, and a projection portion at the tip of the slotted portion for inwardly coupling with the inner circumference of the ball bearing outer ring. A ball bearing extracting tool, comprising: a cylindrical sleeve; and a shaft that has a male thread that is inserted into a through hole of the sleeve and that fits into the female thread, and that has a total length that is longer than the overall length of the sleeve.