JPH08252779A - Bearing member press fitting device of electromagnetic brake - Google Patents

Abstract

PURPOSE: To provide a bearing member press fitting device of an electromagnetic brake capable of correctly and efficiently press fitting a newly installed bearing member into a through hole. CONSTITUTION: A cylindrical body 22a to be inserted is inserted into a bearing hole 21a of an existing bearing member 21 in the condition where a newly installed bearing member 17 and an auxiliary ring-shaped member 23 are inserted into an outer circumferential part of the cylindrical body 22a to be inserted. Then, a rod 19 which is inserted into a through hole 22d of a cylindrical body 22 and screwed with a nut 20 is driven in the arrow direction, the force is straightly applied to the cylindrical part 22a to be inserted by a bearing hole 21a to straightly fit the newly installed bearing member 17 into a through hole 5a, and the newly installed bearing member 17 is fitted into the through hole 5a while pushing out the existing bearing member 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing member press-fitting device for an electromagnetic brake which replaces an existing bearing member press-fitted with a step from the surface of a holding member with a new bearing member.

[0002]

2. Description of the Related Art Generally, a holding member such as a rotatable link has a bearing member fitted in its through hole.
A fulcrum shaft is rotatably inserted in this bearing member.
Such bearing members are also used, for example, in electromagnetic brakes and are shown in FIG. The electromagnetic brake is
As shown in the figure, it has a push-down rod 3 that moves in the vertical direction by a suction unit 2 and a lever 5 that is rotatable around a fulcrum shaft 4, and the vertical movement of the push-down rod 3 is controlled by the lever 5. It has a link mechanism configured to convert by rotation. On the other hand, a pair of levers 7 arranged so as to surround the brake drum 10 are rotatable around a support point 6 whose lower end is held by a bracket 12, and a pair of levers 7 is provided at a free end. A spring 13 held by a nut 16 tightened via a washer 15 is provided at the end of the bolt 14 penetrating therethrough, and a force is applied by the spring 13 in a direction in which they approach each other. The provided shoe 11 is pressed against the brake drum 10. Further, bolts 8 screwed together are provided at the free ends of the levers 7 with their positions being regulated by nuts 9, respectively, and the tips of the bolts 18 are in contact with the levers 5 described above, and the suction portion 2 operates to operate the levers 8. When 5 is rotated, the free end side of the lever 7 is widened against the spring 13 via the bolt 8 to separate the shoe 11 from the brake drum 10. In such an electromagnetic brake, for example, in order to rotatably hold the lever 5 with respect to the fulcrum shaft 4, a through hole is formed in a portion of the lever 5 into which the fulcrum shaft 4 is inserted, and the bearing is provided in the through hole. The member is press-fitted, and then the fulcrum shaft 4 is inserted into the bearing member for use. However, the bearing member wears due to long-term use, so it is necessary to replace the bearing member in order to maintain the electromagnetic brake. A brake bearing member press-fitting device is used.

In a conventional bearing member press-fitting device for an electromagnetic brake, as shown in the sectional view of FIG. 4, the upper end of a rod 19 whose lower end is connected to a drive source is inserted into a cylindrical body 18, and then the upper end of the rod 19 is inserted. The cylindrical body 18 has a through hole 18a into which the rod 19 is inserted, and a stepped portion 18c and a collar at the outer periphery of one end thereof. The portion 18d is formed. Now, when the bearing member of the lever 5 is to be replaced, the small cylinder formed at the lower end of the cylindrical body 18 as shown in FIG. 4 with the lever 5 removed from the electromagnetic brake and the existing bearing member also removed. The portion 18b is inserted into the bearing hole 17a of the new bearing member 17, the upper end of the rod 19 having the lower end connected to the drive source is inserted into the cylindrical body 18, and then the screw portion 19a formed at the upper end of the rod 19 is inserted. The nut 20 is screwed, the new bearing member 17 and the cylindrical body 18 are opposed to the through hole 5a of the lever 5 from above in this state, and the rod 19 is hydraulically or mechanically pulled down in the arrow direction. The force in the direction of this arrow is the nut 20.
And the outer diameter of the flange portion 18c is larger than the inner diameter of the new bearing member 17 and the through hole 5 of the lever 5 is transmitted.
Since it is smaller than a and has a height corresponding to the distance from the surface of the lever 5 to the existing bearing member, the flange portion 18c keeps contacting the upper surface of the new bearing member 17 at the time of press-fitting, and is more than the through hole 5a. Collar portion 18d having a large outer diameter
Moves until it contacts the upper surface of the lever 5,
The new bearing member 17 is press-fitted with a step from the upper surface of the lever 5 and is prevented from being press-fitted excessively.

[0004]

However, the conventional bearing member press-fitting device for an electromagnetic brake is provided with a new bearing member 17
When press-fitting into the through-hole 5a of the lever 5, it is necessary to press-fit while holding the outer peripheral surface of the new bearing member 17 parallel to the inner peripheral surface of the through-hole 5a, and this holding is insufficient. Then, it is not possible to apply a uniform pressing force over the entire circumference of the new bearing member 17, which makes accurate press-fitting difficult. In particular, when a thin bearing member made of a brittle metal such as an oil-impregnated sintered alloy is used as the new bearing member 17, the bearing member is distorted unless press fitting is accurately performed, and the new bearing is distorted. When the fulcrum shaft 4 is inserted into the bearing hole 17a of the member 17, the lever 5 cannot be smoothly rotated, which causes trouble during the braking operation of the electromagnetic brake. In order to avoid such inconvenience, the new bearing member 1 for the through hole 5a is formed.
It is sufficient to keep the outer peripheral surface of the new bearing member 17 parallel to the inner peripheral surface of the through hole 5a while measuring the relative position of 7. However, this takes time and labor, and work efficiency is improved. Had lowered.

An object of the present invention is to provide a bearing member press-fitting device for an electromagnetic brake, which can press-fit a new bearing member into a through hole accurately and efficiently.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is an existing bearing member which is press-fitted into a through hole formed in a holding member with a step from the surface thereof to a new bearing member. In a bearing member press-fitting device for an electromagnetic brake to be replaced with, a cylindrical body in which the new bearing member is fitted to the outer peripheral portion of the insertion-side cylindrical portion is provided, and the insertion-side tip portion of the insertion-side cylindrical portion is a bearing hole of the existing bearing member. A direction in which the existing bearing member is removed from the through hole while the insertion side cylindrical portion is guided along the bearing hole of the existing bearing member and the new bearing member is press-fitted into the through hole. It is characterized in that a driving means for driving to is provided.

[0007]

In the bearing member press-fitting device for an electromagnetic brake according to the present invention, the tip end of the insertion side is inserted into the bearing hole of the existing bearing member with the new bearing member fitted to the outer peripheral portion of the insertion side cylindrical portion as described above. Since the cylindrical member is driven by the driving means, the insertion side cylindrical portion is guided along the bearing hole of the existing bearing member press-fitted into the through hole without tilting as in the conventional case. The new bearing member can be accurately and efficiently pressed into the through hole while removing the existing bearing member.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a bearing member press-fitting device for an electromagnetic brake according to an embodiment of the present invention. An existing bearing member 2 is press-fitted into a lever 5 by the bearing member press-fitting device for an electromagnetic brake.
1 shows the initial state of the work of replacing 1 with the new bearing member 17. An existing bearing member 21 having an axial length that retracts inward by a predetermined dimension from the outer surface of the lever 5 is press-fitted into the through hole of the lever 5, and the rod 1 connected to the drive source is inserted.
A screw portion 19a is formed on the free end side of 9, and a nut 20 is screwed into the screw portion 19a. The cylindrical body 22 inserted into the rod 19 is connected to the rod 19 by a nut 20 in the direction of the arrow shown in the drawing. The outer peripheral portion of the cylindrical body 22 is connected to the outer surface of the lever 5 above the existing bearing member 21. An auxiliary ring-shaped member 23 having an axial length slightly larger than the step is fitted and arranged in a step portion formed therebetween, and a new bearing member 17 is fitted. This cylinder 22
A through hole 22d is formed in the central portion of the
The rod 19 is inserted into the through hole 22d. Further, on the outer peripheral portion of the cylindrical body 22, an insertion side cylindrical portion 22a located on the drive source side, and a step portion 22b and a collar portion 22c located near the end portion on the nut 20 side are formed. The portion 22a has an outer diameter that can be inserted into the bearing holes 21a, 17a of the existing bearing member 21 and the new bearing member 17, and the step portion 22b is larger than the bearing hole 17a of the new bearing member 17 and larger than the through hole 5a of the lever 5. Has a small outer diameter,
Further, the flange portion 22c has an outer diameter larger than that of the through hole 5a of the lever 5. Furthermore, the axial length of the insertion side cylindrical portion 22a is
It has an axial length that is the same as or slightly longer than the sum of the total lengths of the existing bearing member 21, the auxiliary ring-shaped member 23, and the new bearing member 17 that are arranged in series.

When the existing bearing member 21 fitted in the through hole 5a of the lever 5 is to be replaced with the new bearing member 17, first, the new bearing member 17 is provided on the outer peripheral portion of the insertion side cylindrical body 22a of the cylindrical body 22. With the auxiliary ring-shaped member 23 inserted, the insertion side cylindrical body 22a is inserted into the bearing hole 21a of the existing bearing member 21, and the auxiliary ring-shaped member 23 is brought into contact with the existing bearing member 21. Then, the new bearing member 17 is sandwiched between the existing bearing member 21 and the step portion 22b of the cylindrical body 22 via the auxiliary ring member 23, and
Since the new bearing member 17, the auxiliary ring-shaped member 23, and the existing bearing member 21 are in close contact with the outer peripheral portion of the insertion-side cylindrical body 22a, the existing bearing member 21 is of course attached to the inner wall surface of the through hole 5a of the lever 5. That is, the outer wall surfaces of the new bearing member 17 and the auxiliary ring-shaped member 23 are parallel to each other.

Then, the rod 19 is inserted into the through hole 22d of the cylindrical body 22, and the nut 20 is screwed into the threaded portion 19a of the rod 19 which is pulled out, so that the cylindrical body 22 is connected in the direction of the arrow of the rod 19 shown in the drawing. In this state, when the rod 19 is driven in the direction of the arrow, a force is applied straight to the insertion side cylindrical portion 22a of the cylindrical body 22 by the bearing hole 21a of the existing bearing member 21, so that the new bearing member 17 as well as the existing bearing member 21. While being sandwiched by the flange portion 22c of the cylindrical body 22, it is fitted straight into the through hole 5a of the lever 5. Eventually, the existing bearing member 21 is pushed out to the lower side of the lever 5, and this time, the new bearing member 17 is fitted into the through hole 5a of the lever 5 together with the auxiliary ring member 23. In the final state, the flange portion 22c comes into contact with the surface of the lever 5 to regulate the position of the rod 19, but at this time, the step portion 22b has already entered the through hole 5a of the lever 5, and the new bearing member 17 Is press-fitted from the surface of the lever 5 to a position having a predetermined step.

In this way, the tip of the insertion side cylindrical portion 22a in which the new bearing member 17 is fitted to the outer peripheral portion is attached to the existing bearing member 21.
Since the bearing hole 21a of the existing bearing member 21 is used as a guide portion, the new bearing member 17 can be press-fitted into the through hole 5a of the lever 5, and the existing bearing member 21 can be pressed. Since the new bearing member 17 can be pressed into the through hole 5a at the same time while removing the member 21, the new bearing member 17 can be accurately inserted into the through hole 5a without tilting as in the conventional case. Also, it can be efficiently press-fitted. Further, since the new bearing member 17 contacts the existing bearing member 21 via the auxiliary ring-shaped member 23, the new bearing member 17
When the bearing is pressed into a predetermined position within the through hole 5a of the lever 5, the existing bearing member 21 can be easily pulled out from within the through hole 5a, and the outer diameter of the auxiliary ring-shaped member 23 is smaller than that of the through hole 5a. By making the diameter smaller than the inner diameter, the placement of the new bearing member 17 and the initial guidance into the through hole 5a become easy. Further, since the cylindrical body 22 has the step portion 22b formed on the side opposite to the existing bearing member of the new bearing member 17, and the step portion 22b can be inserted into the through hole 5a, the length of the step portion 22b in the axial direction is increased. Corresponding to the through hole 5a
It is possible to press-fit the new bearing member 17 with a predetermined step from the surface of the.

FIG. 2 is a sectional view of a bearing member press-fitting device for an electromagnetic brake according to another embodiment of the present invention. Components equivalent to those in FIG. 1 are designated by the same reference numerals and detailed description thereof will be omitted. Compared with the previous embodiment, the step portion 2 is formed on the outer peripheral portion of the cylindrical body 22.
2b is not formed, and instead has an inner diameter slightly larger than the inner diameters of the existing bearing member 21 and the new bearing member 17, and an outer diameter slightly smaller than the outer diameters of the existing bearing member 21 and the new bearing member 17. Second auxiliary ring member 2
4 are arranged. This second auxiliary ring-shaped member 24
Has an axial length corresponding to a step difference from the surface of the lever 5 to the existing bearing member 21.

Therefore, the second auxiliary ring-shaped member 24 has the same function as the step portion 22b in the previous embodiment, and in the final state of the press-fitting work, the collar portion 22c abuts the surface of the lever 5 and the rod 22c. When the position of 19 is regulated, the second auxiliary ring-shaped member 24 has already entered the through hole 5a of the lever 5, and the new bearing member 17 is press-fitted from the surface of the lever 5 to a position having a predetermined step. Since it is possible to obtain the same effect as that of the previous embodiment, if the second auxiliary ring-shaped member 24 is configured by a member different from the cylindrical body 22 as in the present embodiment, the surface of the lever 5 is Even when the press-fitting depth from the new bearing member 17 to the new bearing member 17 is different, it can be dealt with by adjusting the thickness of the second auxiliary ring-shaped member 24 and the number of used sheets. Expansion It can be.

In the above embodiment, the insertion side cylindrical portion 22a is used.
With the tip of the insertion side inserted into the bearing hole 21a of the existing bearing member 21, the rod 19 is inserted into the through hole 22d of the insertion side cylindrical portion 22a to connect the rod 19 and the cylindrical body 22 to each other. The cylindrical portion 22a is used as the bearing hole 2 of the existing bearing member 21.
The existing bearing member 21 is guided through the through hole 5 while being guided along 1a.
a while removing the new bearing member 17 from the through hole 5a.
Although the driving means is designed to be driven in the direction of press-fitting into the inside, driving means of another structure for driving the cylindrical body 22 in the same direction may be provided.

[0015]

As described above, in the bearing member press-fitting device for an electromagnetic brake according to the present invention, the insertion side cylindrical portion formed at the insertion side tip portion of the cylindrical body in which the new bearing member is fitted to the outer peripheral portion is provided as the existing bearing member. Since it was inserted into the bearing hole of
The new bearing member can be press-fitted into the through hole of the holding member such as a lever while using the bearing hole of the existing bearing member as a guide portion, and the new bearing member does not tilt as in the conventional case. Can be accurately and efficiently pressed into the through hole.

[Brief description of drawings]

FIG. 1 is a sectional view of a bearing member press-fitting device for an electromagnetic brake according to an embodiment of the present invention.

FIG. 2 is a sectional view of a bearing member press-fitting device for an electromagnetic brake according to another embodiment of the present invention.

FIG. 3 is a front view showing a general electromagnetic brake.

FIG. 4 is a sectional view showing a conventional bearing member press-fitting device for an electromagnetic brake.

[Explanation of symbols]

 5 Lever 5a Through hole 17 New bearing member 19 Rod 20 Nut 21 Existing bearing member 22 Cylindrical body 22a Insertion side cylindrical portion 22b Step 22c Collar portion 23 Auxiliary ring member 24 Second auxiliary ring member

Claims (5)

[Claims] 1. A bearing member press-fitting device for an electromagnetic brake, which replaces an existing bearing member press-fitted into a through hole formed in a holding member with a step from the surface thereof, into a new bearing member. Is provided on the outer peripheral portion of the insertion side cylindrical portion, the insertion side distal end of the insertion side cylindrical portion is inserted into the bearing hole of the existing bearing member, and the insertion side cylindrical portion is the existing bearing member. Of the electromagnetic bearing, the existing bearing member being pulled out from the through hole while being guided along the bearing hole, and driving means for driving the new bearing member in the direction of press-fitting into the through hole. Bearing member press-fitting device. 2. The auxiliary ring-shaped member according to claim 1, wherein an auxiliary ring-shaped member located between the existing bearing member and the new bearing member is fitted on the outer circumference of the insertion-side cylindrical portion. A bearing member press-fitting device for an electromagnetic brake, wherein the bearing member press-fitting device is located in the step formed by the existing bearing member in the through hole. 3. The step portion according to claim 1, wherein the cylindrical body is positioned on the side of the new bearing member opposite to the existing bearing member and holds the new bearing member between the existing bearing member and the existing bearing member. A bearing member press-fitting device for an electromagnetic brake, wherein the step portion is formed so as to be inserted into the through hole. 4. The step according to claim 3, wherein the step portion has an axial length corresponding to the step formed by the existing bearing member in the through hole. Electromagnetic brake bearing member press-fitting device. 5. The second auxiliary ring-shaped member according to claim 1, wherein the cylindrical member is provided with a second auxiliary ring-shaped member located on the side opposite to the existing bearing member of the new bearing member. A bearing member press-fitting device for an electromagnetic brake, which is insertable into the through hole and has an axial length corresponding to the step formed by the existing bearing member in the through hole.