JPH071357A - Electromagnetic brake bearing member extraction device - Google Patents

Abstract

(57) [Summary] [Object] To provide a bearing member extracting device for an electromagnetic brake that can be easily mounted and that can apply only a force in the extracting direction to the bearing member when extracting. [Structure] A separable first tubular body 10 having a collar portion 10a that engages with an inner end portion of the bearing member 7a and fitted into the bearing member 7a, and fitted into the first tubular body 10, The bearing member 7a includes a second cylindrical body 11 having a conical outer peripheral surface,
The pulling rod 12 to be inserted into the tubular body 11 and locking means for locking the first tubular body 10 and the second tubular body 11 to the pulling rod 12 are provided. [Effect] It is possible to reduce the size and prevent the bearing member from being locally damaged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing member extracting device for an electromagnetic brake which extracts a cylindrical bearing member press-fitted into a through hole of a fixed core.

[0002]

2. Description of the Related Art Conventionally, as a bearing member extracting device for an electromagnetic brake for extracting a cylindrical bearing member press-fitted into a through hole of a fixed core, as disclosed in, for example, Japanese Patent Application No. 61-141376. A pressing member that can be inserted by deforming the member into a hollow portion, a contact member that comes into contact with the pressing member, and a drawing member that transmits a force in the drawing direction to the contact member are provided, and the bearing member is pressed. It was designed to be pulled out from the through hole.

[0003]

By the way, in the above-mentioned conventional bearing member withdrawing apparatus for an electromagnetic brake, when a pressing member such as a C ring is used, the force for pulling out the bearing member is transmitted. If a relatively large strength is applied to, a large force is required to deform it. Therefore, when the length of the bearing member becomes long, it is difficult to hold the C ring in a deformed state when inserting the C ring into the hollow portion of the bearing member, resulting in poor workability. there were.

Further, in the case of using a pressing member which is formed by dividing a cylindrical body having a brim into two parts and is deformably integrated with a metal fitting, the contact surface between the pressing member and the drawing member is tapered. Therefore, if a force is applied in the direction of pulling out the bearing member, not only the pulling force against the bearing member but also the force that pushes the bearing member toward the wall surface of the through hole will be generated. There is a problem that a large device for generating force is required.
Furthermore, since the force pressing in the wall surface direction of the through hole acts on each part of the inner diameter of the bearing member, when the bearing member is formed of a brittle member such as oil-impregnated sintered metal, this bearing member is locally There is a problem in that it may cause breakage and make drawing more difficult. In particular, this problem has been remarkable in the case of a bearing member having a large inner diameter, which increases the pulling force.

The present invention has been made in view of the above-mentioned problems, and an object thereof is to easily mount the bearing member of an electromagnetic brake which can apply only a pulling force to the bearing member at the time of pulling. An object is to provide a drawing device.

[0006]

In order to achieve this object, the present invention provides a bearing member extracting device for an electromagnetic brake, which extracts a cylindrical bearing member press-fitted into a through hole of a fixed core. A separable first tubular body that has a flange portion that engages with an inner end portion and that is fitted into the bearing member; and a direction that is inserted into the first tubular body and is the direction in which the bearing member is pulled out. A second tubular body having an outer peripheral surface tapering in the direction, and a pull-out rod inserted into the second tubular body,
The first cylinder and the second cylinder are each provided with locking means for locking the pull-out rod.

[0007]

Since the present invention is configured as described above, the divisible first cylinder is fitted into the cylindrical bearing member, and
The second cylinder is fitted into this first cylinder. In response to this, the second cylindrical body applies a pressing force to the first cylindrical body in the direction of the wall surface of the through hole by the outer peripheral surface which is tapered in the direction opposite to the direction in which the bearing member is pulled out. Accordingly, the flange portion of the first tubular body is engaged with the inner end portion of the bearing member. In this state, the first cylinder body and the second cylinder body are locked to the extraction rod by the locking means, and the extraction rod is moved in the extraction direction so that the bearing member is extracted from the through hole. Has become. As described above, since the first tubular body can be divided, the first tubular body can be easily fitted into the bearing member, and the pulling force is generated from the pulling rod through the flange portion of the first tubular body to the inner end portion of the bearing member. Therefore, it is possible to apply only a force in the pulling direction to the bearing member at the time of pulling.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a bearing member extracting device for an electromagnetic brake according to the present invention will be described below with reference to the drawings. 1 is a cross-sectional view showing an embodiment of a bearing member extracting device for an electromagnetic brake according to the present invention, FIG. 2 is a cross-sectional view showing the overall structure of the electromagnetic brake shown in FIG. 1, and FIG. It is a perspective view explaining a method.

Generally, as shown in FIG. 2, the electromagnetic brake 1
Is a casing 2 forming an outer shell, and this casing 2
A fixed core 3 fixed to the lower part of the movable core 4, a movable shaft 4 inserted in the fixed core 3 and movable in the vertical direction of FIG. 2, and a movable core 6 attached to the upper part of the movable shaft 4 by a nut 5. Cylindrical bearing members 7a, 7b press-fitted into the large diameter portions at both axial ends of the through hole 3a formed in the fixed core 3,
The coil 8 mounted inside the casing 2, and the movable core 6 is attracted and repelled by energizing the coil 8.
An arm 9 operated via the movable shaft 4 is provided.

As shown in FIG. 1, the bearing member extracting device for an electromagnetic brake of this embodiment has a collar portion 10a that engages with the inner end of the bearing member 7a and is fitted into the bearing member 7a. A separable first cylindrical body 10; and a second cylindrical body 11 fitted in the first cylindrical body 10 and having an outer peripheral surface that tapers in a direction opposite to the direction in which the bearing member 7a is extracted.
As shown in FIG. 3, a pull-out rod 12 that is inserted into the second tubular body 11 and has a threaded portion 12a on the outer periphery is screwed into the threaded portion 12a of the pull-out rod 12, and one end of the second tubular body 11 is engaged. The abutment member 13 abutting against the screw member 12a of the extraction rod 12 and the spacer 14 at the other end of the second tubular body.
And a nut 15 that abuts via. The locking means for locking each of the first cylindrical body 10 and the second cylindrical body 11 to the pull-out rod 12 is the screw portion 12 described above.
a, the contact member 13 and the nut 15.

In addition, the bearing member 7 of the first cylinder 10 has an inner peripheral surface corresponding to the outer peripheral surface of the second cylinder 11.
It has a shape that tapers in the direction opposite to the direction of extracting a, and can be divided into three fan-shaped parts. Further, as shown in FIG. 3, the outer periphery of the collar portion 10a has a pulling rod 12
Is set to be slightly smaller than the inner diameter of the bearing member 7a in a state of being in close contact with, and is slightly larger than the inner diameter of the bearing member 7a in a state of being fitted with the second tubular body 11,
Further, the outer periphery of the lower portion of the flange portion 10a is set so as to be in close contact with the inner diameter of the bearing member 7a with the second tubular body 11 fitted therein. A plunger of a hydraulic ram (not shown) is connected to the lower end of the pull-out rod 12 to apply a pull-out force to the pull-out rod 12.

In this embodiment, when pulling out the bearing member 7a from the through hole 3a, first, as shown in FIG. 3, the first cylindrical body 10 is inserted up to an intermediate position of the bearing member 7a. Then, the extraction rod 12 having the second cylinder 11 and the contact member 13 mounted thereon is inserted into the first cylinder 10, and then the spacer 14 is attached to the extraction rod 12 and the nut 15 is screwed. Let In this state, the extraction rod 12 is attached to the plunger of the hydraulic ram. At this time, the contact member 13 is positioned below the pull-out rod 12 so that the second tubular body 11 is positioned below the bearing member 7a. Then, the inner peripheral surface of the first cylindrical body 10 is pulled out to draw out the rod 1.
The upper end of the collar portion 11a is positioned so as to be located at the inner end portion of the bearing member 7a while being brought into close contact with # 2. After this, the nut 15 moves the second tubular body 11 through the spacer 14.
The pull-out rod 12 in the pulling-out direction to a position where it abuts against the other end of the second tubular body 11, and abuts the abutting member 13 on one end of the second tubular body 11 and tightens the first tubular body 10 to the first tubular body 10. The second tubular body 11 is inserted. In response, the second
The cylindrical body 11 has a peripheral surface that tapers in the direction opposite to the direction in which the bearing member 7a is pulled out, and applies a pressing force to the first cylindrical body 10 in the direction of the wall surface of the through hole 3a. The lower portion of the collar portion 10a of 10 closely contacts the inner wall of the bearing member 7a, and the collar portion 10a of the first tubular body 10 is engaged with the inner end portion of the bearing member 7a. Nut 15 in this state
After lightly tightening, the hydraulic ram is operated to move the pull-out rod 12 in the pull-out direction so that the shaft bearing member 7a
Is pulled out from the through hole 3a.

In the embodiment constructed as described above, the first tubular body 10 can be divided, so that the first tubular body 10 can be easily fitted into the bearing member 7a, and the pulling force is obtained from the pulling rod 12 to the first tubular body. Since it is applied to the inner end portion of the bearing member 7a via the flange portion 10a of 10, it is possible to apply only a pulling force to the bearing member 7a when pulling out.

Although the pulling out of the bearing member 7a has been described in the present embodiment, the other bearing member 7b can be pulled out by a bearing member pulling device having another structure.

[0015]

Since the present invention is configured as described above, it is possible to easily insert the first cylindrical body into the bearing member by making it separable, thereby improving workability. it can. Further, it is possible to apply only a force in the pulling direction to the bearing member at the time of pulling out, thereby reducing the resistance force at the time of pulling out, so that it is sufficient to generate a relatively small pulling force. It is possible to reduce the size of the device. Further, even when the bearing member is formed of a brittle member, it is possible to prevent the bearing member from being locally damaged.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a bearing member extracting device for an electromagnetic brake of the present invention.

FIG. 2 is a sectional view showing the overall configuration of the electromagnetic brake of FIG.

FIG. 3 is a perspective view illustrating a mounting method of the bearing member extracting device of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electromagnetic brake 3 Fixed core 7a, 7b Bearing member 10 1st cylinder 10a Collar part 11 2nd cylinder 12 Extraction rod 12a Screw part (locking means) 13 Contact member (locking means) 15 Nut (engagement) Stop)

Claims (1)

[Claims] 1. A bearing member withdrawing device for an electromagnetic brake for withdrawing a cylindrical bearing member press-fitted into a through hole of a fixed core, comprising: a flange portion engaging with an inner end portion of the bearing member; A separable first tubular body fitted in the bearing member, and a second tubular body fitted in the first tubular body and having an outer peripheral surface tapering in a direction opposite to the direction of withdrawing the bearing member. And a withdrawal rod to be inserted into this second tubular body,
A bearing member extracting device for an electromagnetic brake, comprising: locking means for locking each of the first cylinder and the second cylinder to the extraction rod.