JP2572185Y2 - Electromagnetic disc brake - Google Patents

Description

[Detailed description of the invention]

[0001]

This invention relates to an electromagnetic disk in which a disk mounted rotatably on a member to be braked and a field core elastically supported by a device fixing portion are arranged on the same axis with a predetermined gap. About brakes,
In particular, the present invention relates to an electromagnetic disc brake that is optimal as a high-speed rotation / high-work braking device.

[0002]

2. Description of the Related Art A conventional electromagnetic disk brake elastically supports a field core, in which an electromagnetic coil or an electromagnetic coil and a permanent magnet are provided, on a fixed portion of a device via a leaf spring. A friction plate facing a disk disposed on the same axis as the core is fitted and fixed.

The field core is magnetically attracted to the disk against the elastic force of the leaf spring by the magnetic attraction of the electromagnetic coil and the magnetic attraction of the permanent magnet, and the disk is braked (Japanese Patent Publication No. 59-1984). -45856 reference).

[0004]

In the electromagnetic disk brake having such a structure, since the friction plate is fitted and fixed to the front surface of the field core, the radial dimension of the friction engagement portion between the disk and the friction plate is reduced. It becomes small and cannot be adopted as a high work braking device. Also, if the outer diameter of the field core is increased, the weight of the field core increases,
The elastic force of the elastic member such as a leaf spring must be increased to absorb the vibration of the field core, and the resistance of the magnetic attraction force of the electromagnetic coil or the permanent magnet increases.

A conventional electromagnetic disc brake is provided at a device fixing portion axially opposed to the back surface of the field core.
Although a structure for elastically supporting the field core is illustrated, such a mounting structure may not be adopted in general industrial machines.

Further, in a braking device for high-speed rotation and high work, the degree of conversion of kinetic energy to thermal energy by frictional engagement of two members is large, and development of an electromagnetic disc brake excellent in heat radiation effect has been developed. Is desired.

[0007]

In order to solve these problems, in the present invention, a brake pad in which a friction plate is fixed to an outer peripheral surface of a field core is formed. The elastic support was provided vertically. Then, the problems of the weight of the field core, the drag of the magnetic attraction force, and the mounting structure were solved.

Further, since the back plate of the brake pad is made polygonal in order to reduce the weight and the friction plates are individually arranged at each corner thereof, the heat radiation effect is also improved.

[0009]

When the field core is magnetically attracted to the disk by the magnetic attraction of the electromagnetic coil or the magnetic attraction of the permanent magnet, the friction plate disposed on the outer peripheral surface of the field core is pressed against the disk. . Then, the disc is braked.

[0010]

1 to 4 show an electromagnetic disc brake according to an embodiment of the present invention. FIG. 1 is a partially cutaway front view, FIG. 2 is a sectional view, FIG. 3 is a rear view, and FIG. It is sectional drawing which expanded only the upper half. Hereinafter, embodiments will be described with reference to these drawings.

The electromagnetic disc brake 1 is used as a safety brake for general industrial machines, and brakes and holds a disc 3 welded to a rotating shaft 2 as a member to be braked. The disc 3 is provided with an electromagnetic coil 10 to be described later.
Although the armature constituting the magnetic circuit of the permanent magnet 15 and the permanent magnet 16 is also used, an armature may be separately prepared in some cases.

The radially outer side surface of the disk 3 is formed as a friction surface, and faces the friction plate 5 of the brake pad 4 with a gap g. The friction plates 5 are individually fixed to the four corners of the back plate 6 having a substantially rectangular shape and a substantially square shape.

The brake pad 4 is elastically supported on a mounting plate 8 bent in an L-shaped cross section by a pair of rectangular leaf springs 7 arranged in parallel. The mounting plate 8 is screwed to a fixing portion of a device (not shown), and the brake pad 4 is vertically elastically supported.

Reference numeral 9 denotes a field core in which the electromagnetic coil 10 is provided, and the disc 9 is provided with a predetermined gap G (gap g).
(Larger). The field core 9 has a male screw portion 9 a formed on the outer peripheral surface, and a female screw portion 6 formed in a center hole of the back plate 6 of the brake pad 4.
a. Then, with the gap G adjusted,
The field core 9 and the brake pad 4 are integrally fixed by the lock bolt 11.

In the electromagnetic disc brake 1 having the above-described structure, as shown in FIG. 4, the magnetic field 12 of the electromagnetic coil 10 causes the field core 9 to apply a magnetic force to the disc 3 against the elastic force of the leaf spring 7. The frictional plate 5 of the brake pad 4 is pressed against the friction surface of the disk 3 by the magnetic attraction. Then, the disk 3 is braked and the rotating shaft 2 is held stationary.

Next, an electromagnetic disc brake according to another embodiment of the present invention will be described with reference to FIG. This electromagnetic disc brake 13 differs from the structure in which an electromagnetic coil 15 and a permanent magnet 16 are provided inside a field core 14.
Other structures such as a structure to be screwed into the female screw portion 6a are the same as those of the electromagnetic disc brake 1.

In the electromagnetic disk brake 13 having such a structure, the field core 14 is normally magnetically attracted to the disk 3 by the magnetic flux 17 of the permanent magnet 16.
The disc 3 is being braked. If the electromagnetic coil 15 is energized to cancel the magnetic flux of the permanent magnet 16, the field core 14 retreats from the disk 3 by the elastic force of the leaf spring 7.
Then, the braking of the disk 3 is released.

In the above description, after the field cores 9 and 14 are screwed into the brake pads 4 to adjust the gap G, the members 4, 9 and 14 are integrated with the lock bolts 11. The present invention does not limit such a structure.

[0019]

The electromagnetic disk brake according to the first invention comprises a brake pad having a friction plate fixed to the outer peripheral surface of a field core arranged on the same axis as the disk to be braked. Since the field core and the brake pad are vertically elastically supported on the device fixing portion, a relatively lightweight braking device for high-speed rotation and high work can be developed, and a braking device that can be easily mounted can be provided.

In the electromagnetic disc brake according to the second invention, the back metal of the brake pad is made polygonal in order to reduce the weight, and the friction plates are individually arranged at each corner thereof, so that the heat radiation effect can be improved. it can.

Furthermore, in the electromagnetic disc brake according to the third invention, since the position of the field core can be adjusted in the center hole of the brake pad, the gap formed between the field core and the disc can be adjusted. Easy.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of an electromagnetic disc brake according to an embodiment of the present invention.

FIG. 2 is a sectional view of the electromagnetic disc brake of FIG.

FIG. 3 is a rear view of the electromagnetic disc brake of FIG. 1;

FIG. 4 is an enlarged sectional view of an upper half of FIG. 2;

FIG. 5 is an enlarged sectional view of only the upper half similar to FIG. 4, which is an electromagnetic disc brake according to another embodiment of the present invention.

[Explanation of symbols]

 3 disc 4 brake pad 5 friction plate 6 back plate 7 leaf spring 9 field core

Claims (3)

(57) [Scope of request for utility model registration] 1. A disc mounted on a member to be braked, a field core disposed on the same axis as the disc and having an electromagnetic coil or an electromagnetic coil and a permanent magnet provided therein,
An electromagnetic disk, comprising: a brake pad disposed on an outer peripheral surface of the field core and facing a friction surface of the disk, wherein the field core and the brake pad are vertically elastically supported by a device fixing portion. brake. 2. The electromagnetic disc brake according to claim 1, further comprising: the brake pads having friction plates individually arranged at respective corners of a polygonal back plate. 3. The brake pad according to claim 2, wherein the brake pad is vertically elastically supported by the device fixing portion, and the field core is configured to be adjustable in a center hole of the brake pad. The electromagnetic disc brake according to 1.2.