JPS6355300B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention includes a belt pulley or a shaft coupling on one shaft end, and an electromagnetic single plate brake used for stopping and/or holding an electric motor. The magnetic core is supported by a bearing cover fixed to a bearing shield of the motor, and the armature disk of the magnet is connected to an end surface of the motor side of the belt pulley or shaft coupling. Involved.

Such an electric motor with a brake is known, for example, from West German Utility Model Registration No. 7704543.

In this known brake-equipped electric motor, the belt pulley is provided at the drive-side shaft end of the motor, and the brake, which has a magnet core and an armature disk, is provided at the non-drive-side end of the motor.

With advances in control technology, it is now often necessary to mount an additional measuring transmitter on the non-driving shaft end of the motor. This often results in the motor having an excessive overall length and a relatively expensive construction.

Therefore, if the brake is disposed between the belt pulley and the electric motor according to the above-mentioned utility model, the overall length and additional parts can be significantly reduced.

Although this arrangement has achieved good results, a problem arises in that the belt tension is increasingly increased, which increases the stress on the motor driving side bearing. From this point of view, it is desired to shorten the distance between the belt pulley and the driving side bearing as much as possible.

Therefore, it is an object of the present invention to propose a structure that significantly shortens the distance between the belt pulley and the driving side bearing in the electric motor mentioned above.

According to the invention, this object is achieved at low cost because the bearing cover forms part of the magnetic path of the magnet core. By doing this, the bearing cover becomes 2
fulfills two functions. One of these is to hold and seal the bearing, and the other is to function as an element of a single-plate brake.

Next, one embodiment of the present invention will be described in detail based on the drawings.

A V-belt pulley 9 is fixed onto the shaft 2 of an electric motor with a brake, which is not shown in its entirety in the drawings, and the driving force is transmitted therefrom via a V-belt, which is not shown. On the driving side of the electric motor, an electromagnetic single plate brake 6 surrounding the shaft 2 is provided between the bearing shield 3 and the belt pulley 9, and the electric motor is suddenly stopped and held by this brake.

A bearing cover 4 is fixed to the bearing shield 3 with bolts 5, and this bearing cover 4 has its protruding portion 4.
1 holds the bearing 11 in the axial direction. A magnet core 62 with a coil 61 of the single-plate brake 6 is fixed to the bearing cover 4 by a bottle 64 disposed on the circumference offset from the bolt 5. As can be seen, the bearing cover 4, which is made of a magnetic material with good properties, for example special cast steel, also forms part of the magnetic path of the single-plate brake 6.

The armature disk 7 of the brake 6, which is separated by the gap S when not energized, is connected to the V-belt pulley 9 by a leaf spring 71 and a bolt 72. Adjustment of the air gap S takes place by means of a spacing ring 8.

The magnetic flux generated by the current flowing through the coil 61 is transferred from the magnet core 62 to the magnetic disc 7 due to the notch 63.
, returns to the magnet core 62 again, passes through the bearing cover 4, and closes.

The above-mentioned structure has the same function as a known single disc brake, the principle of which is described in the catalog "Clutches and Brakes" published by Siemens GmbH, West Germany, published in July 1976. A portion of the magnetic path formed by the bearing cover 4 is provided at the location where the arming disc was conventionally provided, while the opposite end surface of the magnet core forms a surface facing the polarizing disc.

[Brief explanation of the drawing]

The figure is a partial cross-sectional view of the driving side of an electric motor with a brake showing one embodiment of the present invention. In the figure, 2
3 is a shaft, 3 is a bearing shield, 4 is a bearing cover, 6 is the entire single plate brake, 7 is an armature disc, 9 is a belt pulley, and 62 is a magnet core.

Claims (1)

[Claims] 1. A belt pulley or shaft coupling, etc., and an electromagnetic single-plate brake used to stop and/or hold the electric motor are provided on the shaft end, and this magnetic core is fixed to the bearing shield of the electric motor. In an electric motor with a brake that is supported by a bearing cover and in which the armature disc of the magnet is coupled to the motor side end surface of the belt pulley or shaft coupling,
An electric motor with a brake, wherein the bearing cover is made of a magnetic material and forms a part of a magnetic path of a magnet core of the single-plate brake.