JP2601052Y2 - Bearing extraction device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing pull-out device used for pulling out a bearing or the like when disassembling and maintaining a machine, and more particularly to a technique for improving operability and preventing damage to the bearing.

[0002]

2. Description of the Related Art In machines such as aircraft and vehicles, a large number of rotating shafts are used for devices such as engines and power trains. These rotating shafts are supported by various bearings such as plain bearings and ball bearings, so that they can rotate smoothly inside the apparatus.

[0003] When performing periodic heavy maintenance or repairs in the event of a failure, the bearing together with the rotating shaft is often separated from the device. At this time, it is necessary to pull out the outer race or the like of the bearing press-fitted into the housing of the apparatus, as disclosed in Japanese Utility Model Laid-Open No. 1-121668 and Japanese Utility Model Laid-Open No. 1-138.
A bearing drawing device as described in JP-A-580 is used. Each of these bearing pull-out devices has a feature that the bearing can be pulled out from one side of the housing.

The former includes a hollow cylindrical main body having a plurality of claws, a slot, and an inner taper formed at the tip, a movable portion screwed into a hollow portion of the main body and having an outer taper formed at the tip, And a retaining ring that is screwed onto the outer periphery. In this device, first, the main body is inserted into the inner diameter portion on the bearing side, and the holding ring is brought into contact with the end face on the housing side, and then the movable portion is rotated backward to be moved. Then, the inner taper of the main body and the outer taper of the movable portion come into contact with each other, the front end of the main body expands from the slit, and the pawl is locked to the front end face or the inner diameter of the bearing. When the movable portion is further moved rearward in this state, the bearing moves rearward together with the movable portion and is pulled out of the housing.

On the other hand, the latter includes a cylindrical main body having a peripheral concave portion formed on the outer peripheral surface near the distal end portion, a locking piece fitted into the peripheral concave portion and urged in the axial direction by an elastic member, The body comprises a plurality of operation pins which are disposed slidably in the axial direction, and whose front ends abut against the inside of the locking pieces when moving forward.
In this device, after inserting the main body into the inner diameter portion on the bearing side, the pin body is advanced. Then, the locking piece pressed against the tip of the pin body projects outward from the peripheral concave portion, and is locked to the front end face of the bearing. Thereafter, when the main body is moved rearward, the bearing moves rearward together with the main body, and is pulled out of the housing.

[0006]

In recent years, when a bearing is pressed into a housing, a method of applying a fixing agent to an outer diameter portion of the bearing to prevent the bearing from falling off due to vibration or the like is often adopted. In this case, since the bearing is strongly fixed to the housing, a large pulling force is required when pulling out. Therefore, as a matter of course, also in the above-described bearing pull-out device, it is necessary to increase the locking force of the main body with respect to the bearing.

However, the aforementioned Japanese Utility Model Laid-Open Publication No. 1-121668.
In the device described in Japanese Patent Application Laid-Open Publication No. H10-27095, since the main body is expanded to perform locking, if a large locking force is to be obtained,
The outer peripheral surface of the main body strongly contacts the inner diameter of the bearing. For this reason, the bearing itself has a problem that the outer diameter of the bearing is increased and the bearing is more firmly fixed to the housing, making it more difficult to pull out the bearing. Also, plain bearings often have a surface layer such as Teflon coating on the inner diameter, but this surface layer is scratched by being pressed by the expanded body,
Sometimes they had to be replaced.

On the other hand, in the device described in Japanese Utility Model Laid-Open Publication No. 1-138580, the locking piece is connected to the main body only by fitting into the peripheral concave portion and urging force by the elastic member.
When a large pulling force is applied, there is a risk that the locking pieces may fall off the main body.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the problems of the prior art and to provide a bearing pull-out device capable of easily and reliably pulling out a bearing or the like firmly fixed to a housing. .

[0010]

In order to achieve the above-mentioned object, a bearing pull-out device of the present invention is a bearing pull-out device for pulling out a bearing fitted in a bearing hole of a housing. A cylindrical retaining ring having an inner diameter larger than the inner diameter of the bearing hole, which is coaxial with the bearing hole on one side in the axial direction of the hole and opposite to the bearing hole of the retaining ring; A nut mounted on an end surface of the side via a thrust bearing and rotatable around the axis with respect to the holding ring, and a male screw screwed into a female screw of the nut are formed on an outer peripheral surface thereof, and are formed in the axial direction. And a stepped surface extending in the circumferential direction with respect to the axis is recessed at an end of the through hole provided on the bearing hole side coaxially with the axis thereof. And the step surface is provided at the tip of a body portion extending in the axial direction while being insertable into the through hole of the displacement member through the bearing from the other side in the axial direction of the bearing hole. A plurality of engaging members having a first claw that can be axially engaged with the first end and a second claw that can be axially engaged with an end surface of the bearing at a rear end of the main body portion; An operation pin for fixing the engagement member in a state where the first and second claws are respectively engaged with the step surface and the end surface of the bearing when inserted into the through hole of the displacement member. Features.

[0011]

When pulling out the bearing fitted in the bearing hole of the housing using the bearing pulling-out device of the present invention, first, the retaining ring must be coaxial with the bearing hole on one axial side of the bearing hole. In close contact with the housing.
Next, when the displacement member is rotated in a state where the nut is gripped and fixed so as not to be rotatable, the displacement member can be screwed forward so that its tip can approach the bearing hole. Thereafter, the plurality of engaging members are inserted into the through hole of the displacement member from the other side in the axial direction of the bearing hole via the inside of the bearing, and the first claw at the tip thereof is inserted into the step surface of the displacement member. At the same time, the second pawl is engaged with the end face of the bearing opposite to the retaining ring. When the operation pin is inserted into the through hole of the displacement member, the plurality of engagement members are fixed by the operation pin in a state where the first and second claws are engaged with the step surface and the end surface of the bearing, respectively. . When the nut is rotated in this state, the displacement member is displaced in a direction away from the bearing hole, so the bearing fitted in the bearing hole is displaced in the axial direction together with the displacement member and the engagement member, Pulled out from the bearing hole.

That is, in the bearing pull-out device of the present invention, since the displacement member and the engagement member are completely separated from each other, the engagement member is grasped by hand and engaged with the displacement member without damaging the bearing. Can be done. In addition, not only can the displacing member be screwed forward to approach the bearing whose tip portion is to be pulled out,
Since the engaging portion is provided at the tip of the displacement member, the engaging member can be easily engaged with the displacement member. Accordingly, it is possible to reliably prevent the bearing to be pulled out from being damaged by the engagement member during the operation of engaging the engagement member with the displacement member.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a bearing pulling device according to an embodiment of the present invention; 1 to 3, reference numeral 1 denotes a cylindrical holding ring that abuts an end surface of a housing 2 (indicated by a two-dot chain line in FIG. 1), and a bearing 3 fitted in a bearing hole 2 a of the housing 2.
(Indicated by a two-dot chain line in FIGS. 1 and 3), the inner diameter of which is larger than the outer diameter of the bearing hole 2a (the outer diameter of the flange). A relatively large nut 5 is mounted on the rear end face of the retaining ring 1 via a thrust ball bearing 4 with a retainer.

Reference numeral 6 denotes a cylindrical displacement member having a relatively small diameter through hole 7 formed in the axis thereof and a male screw portion 9 screwed to the female screw portion 8 of the nut 5 on the outer peripheral surface. Have been. An annular locking groove 10 that forms a stepped surface is formed on the inner surface of the distal end portion of the displacement member 6, and a pair of engaging members 11 is formed at the distal end on the side surface (stepped surface) of the locking groove 10. The first claw 12 is engaged. Engaging member 11
Is a second claw 1 projecting at the rear end in the same direction as the first claw 12.
3 are formed, and the whole is substantially U-shaped.

An operation pin 14 having a bullet-shaped tip is slidably fitted in the through hole 7 of the displacement member 6.
As shown in FIG. 1, the outer peripheral surface of the operation pin 14 abuts on the inner surface of the engaging member 11 during the forward movement. When the operation pin 14 and the engagement member 11 are in contact with each other, the engagement member 1
1 has its outer surface weakly contacting the inner wall surface 3a of the bearing 3, and the first claw 12 and the second claw 13 are engaged with the side surface (step surface) of the locking groove 10 and the end surface of the bearing 3, respectively. It is fixed to the state. In addition,
A knurled grip portion 15 is formed at the rear end of the operation pin 14, and knurled at the center of the rear end surface for gripping by hand when pulling out the operation pin 14 from the through hole 7. A small-diameter auxiliary grip 16 is screwed.

In order to pull out the bearing 3 fitted in the bearing hole 2a of the housing 2 using the bearing pulling device of the present embodiment, first, the holding ring 1 is pulled out of the bearing hole 2a.
On one side in the axial direction of the housing 2 is coaxial with the bearing hole 2a and is brought into close contact with the wall surface of the housing 2. Next, nut 5
When the displacement member 6 is rotated in a state where it is gripped and fixed so that it cannot be rotated, the displacement member 6 can be screwed forward, and the tip end portion can approach the bearing hole 2a.

Thereafter, the plurality of engaging members 11 are grasped by hand, and the bearing 3 is inserted from the other side in the axial direction of the bearing hole 2a.
The first claw is engaged with the side surface of the locking groove 10 of the displacement member 6, and the second claw 13 is engaged with the holding ring 1 of the bearing 3. Engage with the opposite end face. At this time, the plurality of engaging members 1
Since 1 is completely separated from the displacement member 6, the bearing 3 can be engaged with the displacement member 6 without damaging it. Further, not only can the distal end portion of the displacement member 6 be brought close to the bearing 3 to be pulled out by screwing the displacement member 6, but also the engaging member 11 is attached to the distal end portion of the displacement member 6.
Is provided, the engaging member 11 can be easily engaged with the displacement member 6. Accordingly, it is possible to reliably prevent the bearing 3 from being damaged by the engagement member 11 during the operation of engaging the engagement member 11 with the displacement member 6.

When the operating pin 14 is inserted into the through hole 7 of the displacement member 6, the plurality of engaging members 11 are displaced radially outward by being pressed against the outer peripheral surface of the operating pin 14, and the outer surface thereof is displaced. Abuts against the inner wall surface 3a of the bearing 3, and the first and second claws 12 and 13 are fixed to be engaged with the side surfaces of the locking groove 10 and the end surface of the bearing 3, respectively. At this time, as described above, the engagement member 11
Of the bearing 3 is weak against the inner wall surface 3a of the bearing 3, so that the inner wall surface 3a of the bearing 3 is not damaged.

Next, when the nut 5 is rotated in this state, the displacement member 6 is displaced in a direction away from the bearing hole 2a, so that the bearing 3 fitted in the bearing hole 2a is displaced by the displacement member 6 And is displaced in the axial direction together with the engaging member 11, and is withdrawn from the bearing hole 2a. When the nut 5 is rotated, the pull-out reaction force of the bearing 3 acts as a thrust force. However, since the thrust ball bearing 4 is interposed between the retaining ring 1 and the nut 5, the nut 5 can be smoothly moved. Rotation can be obtained, and the end faces of the holding ring 1 and the nut 5 can be prevented from being damaged. Also, since the retaining ring 1 does not rotate, the housing 2
Can completely prevent the end face from being damaged.

After the pulling of the bearing 3 is completed, the auxiliary grip 16 is gripped, and the operating pin 14 is pulled out of the displacement member 6. Then, the engaging member 11 comes off and the bearing 3
And the displacement member 6 are separated.

Although the description of the specific embodiment has been completed above, embodiments of the present invention are not limited to this embodiment. For example, the number of the engagement members may be three or more, or the main body and the engagement members may be swingably connected using an operation pin or the like.

[0022]

As is clear from the above description, the bearing pulling-out device according to the present invention completely separates the displacement member and the engagement member. Can be engaged with the displacement member without damaging it. In addition, not only can the displacing member be screwed forward to allow the distal end portion to approach the bearing to be pulled out, but the displacing member has a distal end portion provided with a portion where the engaging member is engaged. Can be easily engaged with the displacement member. Thus, it is possible to reliably prevent the bearing to be pulled out from being damaged by the engagement member during the operation of engaging the engagement member with the displacement member.

[Brief description of the drawings]

FIG. 1 is a half longitudinal sectional view showing an embodiment of a bearing pulling device according to the present invention.

FIG. 2 is a view taken in the direction of arrow A in FIG.

FIG. 3 is an exploded perspective view showing one embodiment of the bearing pull-out device according to the present invention;

FIG. 4 is an explanatory view showing the operation of the present invention.

FIG. 5 is an explanatory view showing the operation of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Retaining ring 2 Housing 3 Bearing 4 Thrust ball bearing 5 Nut 6 Displacement member 7 Through hole 8 Female screw part 9 Male screw part 10 Locking groove 11 Engaging member 12 First claw 13 Second claw 14 Operation pin

Claims (1)

(57) [Scope of request for utility model registration] 1. A bearing pull-out device for pulling out a bearing fitted in a bearing hole of a housing, wherein one side of the bearing hole in the axial direction can be brought into close contact with the housing coaxially with the bearing hole. A cylindrical holding ring having an inner diameter larger than the inner diameter of the bearing hole; and the holding ring mounted on the end face of the holding ring opposite to the bearing hole via a thrust bearing. A nut rotatable around an axis, and a male screw screwed into the female screw of the nut are formed on the outer peripheral surface of the nut so that the nut can be screwed in the axial direction, and a through-hole is provided coaxially with the axis. A cylindrical displacement member in which a step surface extending in the circumferential direction with respect to the axis is recessed at the end of the bearing hole side, and the inside of the bearing from the other side in the axial direction of the bearing hole. A first claw that is insertable into the through hole of the displacement member and has a first claw that can be axially engaged with the step surface at a distal end of the main body portion that extends in the axial direction, and has an end surface of the bearing. A plurality of engaging members having a second claw that can be engaged in the axial direction at a rear end of the main body portion; and the first and second claws when inserted into the through holes of the displacement member, respectively. An operating pin for fixing the engaging member in a state of being engaged with the step surface and the end surface of the bearing, respectively.