JP2002130340A - Non-excitation actuated brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify assembly work and improve productivity in a non- excitation actuated brake in which generation of unpleasant noise originating in the vibration of a brake disc is prevented. SOLUTION: An elastically deformable resilient piece 9 which is formed integrally in cantilever support shape and has a free end protruding in the central bore 7c is provided in the periphery of the central bore 7c of a disc body 7a made of synthetic resin material. As for brake disk 7 fitted on the outer periphery of a hub 10, vibration in an idle-running is prevented by elastic restoration power of the resilient piece 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-excitation brake in which a brake disk is fitted to a hub so as to be movable only in the axial direction.

[0002]

2. Description of the Related Art In a non-excited operation brake, a brake disk is fitted to a hub mounted on a rotating shaft so as to be movable only in the axial direction, and a slight gap is provided between an outer peripheral surface of the hub and a center hole of the brake disk. Is provided. Therefore, in the excited state in which the exciting coil is energized, if the brake disk during idling vibrates due to external vibration, the center hole of the brake disk collides with the outer peripheral surface of the hub, and unpleasant noise is generated. The problem of the generation of such abnormal noise is caused by interposing an elastic member such as a compression coil spring between the outer peripheral surface of the hub and the center hole of the brake disk as proposed in, for example, JP-A-58-124834. It is solved by doing.

[0003]

In a conventional non-excited operation brake, a spring accommodating portion for accommodating an elastic member is provided on a brake disk, and an elastic member is interposed between the spring accommodating portion and the outer peripheral surface of the hub. With this configuration, the assembling work for incorporating the elastic member takes time and effort. In addition, some measures have to be taken to prevent the elastic member from dropping out of the storage section.

SUMMARY OF THE INVENTION An object of the present invention is to provide a non-excited operation brake capable of easily assembling and improving the productivity.

[0005]

In order to achieve the above object, a non-excited operation brake according to the present invention comprises a side plate (3) fixed to a field core (1) and the field core (1). Armature (6) movably supported only in the axial direction, a disk body (7a) made of a synthetic resin material, and a polygonal center hole (7c) formed at the center of the disk body (7a). An elastic piece (9) is integrally formed around the center hole (7c) in a cantilever support state, and has a free end protruding into the center hole (7c) and capable of elastic deformation. A brake disk (7) interposed between the plate (3) and the armature (6) and an outer peripheral surface formed in a polygonal shape are provided, and the outer peripheral surface is provided with an elastic return force of the elastic piece (9). Against the brake Center hole of the disk (7) (7
c) a hub (10) fitted to the armature (6); and a braking spring (11) for urging the armature (6) toward the side plate (3).

In the non-excited operation brake of the present invention, the disk body (7a) of the brake disk (7) is formed of a synthetic resin material, and is cantilevered around the center hole (7c) of the disk body (7a). Integrally formed in the state,
Since the elastic piece (9) whose free end protrudes into the center hole (7c) and is elastically deformable is provided, the vibration of the brake disc (7) is prevented by the elastic restoring force of the elastic piece (9), so that the vibration can be prevented. The problem of sound generation can be solved. Also, since the elastic piece (9) is formed integrally with the disk body (7a),
The elastic piece (9) does not fall off.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a non-excited operation brake will be described below with reference to FIGS. FIG. 1 is a sectional view of a non-excitation operation brake, and FIG. 2 is a plan view of a brake disk. The non-excited operation brakes shown in these drawings are electromagnetic brakes that hold the rotating shaft stationary.

In the non-excitation operation brake, a field core 1 is mounted on a motor housing (not shown). The field core 1 is an annular member having a U-shaped cross section, and an exciting coil 2 wound around a coil bobbin is housed in the coil housing groove 1a. On the side surface (magnetic pole surface) on the side where the coil accommodating groove 1a is opened, a screw hole 1b formed at a position obtained by dividing the circumferential direction into three equal parts, and a circumferential direction different from the screw hole 1b is set to three or the like. A bottomed spring hole 1c formed at a divided position
Is provided.

A disk-shaped side plate 3 is provided on the magnetic pole face side of the field core 1 at a predetermined interval in the axial direction, and a collar 4 interposed between the field core 1 and the side plate 3 is screwed. 5 and screwed into the screw hole 1b, the field core 1 and the side plate 3
Are fixed together.

A disc-shaped armature 6 is provided between the field core 1 and the side plate 3. A through hole is formed near the outer peripheral surface of the armature 6, and guided by the collar 4 inserted into the through hole, the armature 6 is supported by the field core 1 so as to be movable only in the axial direction. Also, side plate 3 and armature 6
A disk-shaped brake disk 7 having an outer diameter smaller than the outer diameter of the side plate 3 and the armature 6 is interposed between the side plates 3 and the armature 6.

The brake disk 7 has a structure in which a brake lining 8 is fixed to a disk body 7a made of a synthetic resin material. The disk body 7a is formed with annular grooves 7b formed on both side surfaces and a center. Square center hole 7c
Is provided. Further, the wall surface of the annular groove 7b is subjected to a matte surface treatment by shot blasting in order to increase the bonding strength, and after applying an adhesive to the surface-treated wall surface, the annular groove 7b A ring-shaped brake lining 8 is fitted and fixed. Note that the brake lining 8 protrudes from the side surface of the disk main body 7a.

A slit 7d is formed in the disk body 7a of the brake disk 7 so as to penetrate in the plate thickness direction and open toward the center hole 7c. 7d slit
Are formed parallel to each other at an interval so as to be orthogonal to the planar wall surface of the center hole 7c, and a pair of slits 7d are individually provided around two adjacent wall surfaces among the four wall surfaces. ing. Between the pair of slits 7d, there is provided an elastic piece 9 extending toward the center of the brake disk 7 and having a radially inner free end slightly projecting radially inward from the wall surface of the center hole 7c. . Moreover,
A concave portion 9a is formed in the elastic piece 9 and is provided in a shape capable of elastic deformation.

That is, the center hole 7c of the disk body 7a
Are provided integrally with the disk main body 7a in a cantilevered support state, and two elastic pieces 9 whose free ends protrude into the center hole 7c and are elastically deformable. These elastic pieces 9 are elastically deformed by fitting a hub 10 made of a sintered alloy material into the center hole 7c. The hub 10 is formed in a quadrangular prism shape, and its outer peripheral surface is engaged with the center hole 7c of the brake disc 7 in the rotation direction.

The spring hole 1c of the field core 1 accommodates a braking spring 11 for urging the armature 6 toward the side plate 3.

In the non-excited operation brake constructed as described above, the brake disk 7 is braked by the armature 6 and the side plate 3 by the spring force of the braking spring 11 when the excitation coil 2 is not energized. In addition, the rotating shaft whose rotation has stopped can be kept stationary. When the excitation coil 2 is energized to be excited,
The armature 6 separates from the brake disk 7 and is magnetically attracted to the field core 1 against the spring force of the brake spring 11, so that the brake on the brake disk 7 is released.

Although the elastic piece 9 having the concave portion 9a has been described as an embodiment, the shape of the elastic piece 9 may be another shape. Further, the elastic piece 9 is provided so as to be orthogonal to the wall surface of the center hole 7c of the brake disk 7, but any elastic piece integrally formed in a cantilevered manner around the center hole 7c of the disk body 7a. It does not need to be orthogonal to the wall surface of the center hole 7c.

[0017]

The non-excitation operation brake according to the present invention is provided around a center hole of a disk body made of a synthetic resin material.
An elastic piece that is integrally formed in a cantilevered support state and whose free end protrudes into the center hole is provided so that it can be elastically deformed. The problem of abnormal noise generation can be solved by force. Further, since the elastic piece is formed integrally with the disk body, the elastic piece does not fall off. Therefore, the productivity of the non-excitation operation brake can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a non-excitation operation brake.

FIG. 2 is a plan view of a brake disk.

[Explanation of symbols]

 7 Brake disc 7a Disc body 9 Elastic piece

Claims (1)

[Claims] 1. A side plate fixed to a field core, an armature movably supported on the field core only in an axial direction, a disk body made of a synthetic resin material, and formed at the center of the disk body. A polygonal center hole and an elastic piece that is integrally formed in a cantilevered support state around the center hole and has a free end protruding into the center hole and capable of elastic deformation are provided.
A brake disk interposed between the side plate and the armature; and an outer peripheral surface formed in a polygonal shape. The outer peripheral surface has a central hole formed in the brake disk against the elastic return force of the elastic piece. A non-excited operation brake, comprising: a hub fitted to the armature; and a brake spring for urging the armature toward the side plate.