JPS6336180Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a non-excitation operated electromagnetic brake.

A typical configuration of a conventional electromagnetic brake of this kind commonly used in small electrical equipment is as shown in FIG. An armature 3 is arranged to face the end face of a yoke 1 containing a coil 1, an inner disk 4 and an end plate 5 are arranged on the opposite side of the armature 3, and the yoke 2 has a support plate 8.
The end plate 5 and the support plate 8 are fixed by bolts 9, and the armature 3 is separated from the support plate 8 and therefore the yoke 2 by the coil spring 6 fitted into the bolt 9. be. The armature 3, which receives the force of the coil spring 6, clamps the inner disk 4 between it and the end plate 5, and stops the rotation of the inner disk 4 and therefore the hub 7. When coil 1 is energized, armature 3 is activated by coil spring 6.
The inner disk 4 and therefore the hub 7 become free to rotate.

This invention is an improved shape of the electromagnetic brake yoke, which has a recess into which the coil wound around the bobbin is fitted, and a fixing/outer pole part for fixing to the end plate on the outside of the recess. A simple and inexpensive non-excitation operated electromagnetic brake is constructed using a yoke formed in a continuous U-shape when viewed from the side so as to have an inner pole inside.

An embodiment of the present invention will be described below with reference to FIG.

Figures 2a and 2b show longitudinal cross sections of the electromagnetic brake according to the present invention, where the same reference numerals as in Figure 1 indicate the same elements, and 2a shows a radially outward view of the coil fitting part. The yoke has a fixed part and an inner pole part inside, and is made by bending and forming a relatively thick flat magnetic material, and has a structure in which the yoke 2 and the support plate 8 in FIG. 1 are integrated. ing. A bobbin 10 is attached to the coil fitting portion of the yoke 2a.
The coil 1 wound on the bobbin 1 is inserted into the bobbin 1.
0 is pressed against the yoke 2a by applying an elastic repulsive force between it and the armature 3 by a disc spring or similar spring 6a.

This yoke 2a is attached to the end plate 5 via a resistance 11 with bolts 9. This resistance 11 restrains the armature 3 in the radial direction but not in the axial direction. And armature 3 and end plate 5
An inner disk 4a made of soft resin and having a hub 7 is provided between the two.

In this electromagnetic brake, when the coil 1 is not energized, the armature 3 and the inner disk 4a are both pressed against the end plate 5 by the acting force of the spring 6a, stopping the rotation of the inner disk 4a. In this case, since the inner disk 4a is made of a soft resin, such as rubber or other resin, each member that comes into contact with the inner disk 4a, namely the armature 3, the end plate 5,
The contact between the hub 7 and the like is smooth and no vibration noise is generated.

On the other hand, when the coil 1 is energized, the armature 3 is attracted to the yoke 2a against the acting force of the spring 6a, so that the inner disk 4a becomes free and can freely rotate together with the hub 7.

As mentioned above, in the present invention, the yoke is constructed by bending and forming a relatively thick flat magnetic material, and the coil wound around the bobbin is fitted into the yoke and held under pressure by the spring. Unlike the coils of conventional brakes of this type, there is no need to fix the coils by resin injection, which simplifies the manufacturing process.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing the structure of a conventional non-excitation operated electromagnetic brake, and FIGS. 2 a and 2 b are vertical sectional views showing an embodiment of the present invention. 1... Coil, 2, 2a... Yoke, 3... Armature, 4, 4a... Inner disk, 5
...End plate, 6, 6a...Spring, 7...
Hub, 8... Support plate, 9... Bolt, 10... Bobbin, 11... Distance.

Claims (1)

[Scope of utility model registration request] An armature and an inner disk are installed between a yoke and an end plate so as to be movable in the axial direction, and when the coil in the yoke is deenergized,
The armature is moved in the axial direction by a spring acting force so as to pinch the inner disk between the end plate, and the armature is attracted to the yoke by energizing the coil, and the inner disk is moved. A non-excitation operated electromagnetic brake that stops rotation includes a coil wound around a bobbin, a coil fitting part for fitting the coil, an inner pole part radially inward with respect to the coil fitting part, and the above-mentioned coil fitting part. A yoke formed by bending a single flat magnetic plate to form a fixed and outer pole part radially outward with respect to the coil fitting part, and a spring that presses the bobbin against the yoke. Features a non-excitation operated electromagnetic brake.