SU1494078A1 - Brush holder - Google Patents

Abstract

This invention relates to electrical engineering, in particular, to brush holders used in electrical machines. The purpose of the invention is to increase the service life and maintainability. For this purpose, in the brush holder, comprising a housing 1 in which the support 2 is mounted with a coil spring 3 fixed on it, a compensating Z-shaped loop 4 is made on the end of the spring fixed on the support. At the support the notch has a slot 5 forming a notch with a notch . A loop is wound at its end 7 with the possibility of its contact with a protrusion for fixing the end of the loop in the support in the working position of the spring. 4 il.

Description

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The invention relates to electrical engineering in terms of the design of brush holders used in electrical machines.

The purpose of the invention is to increase the service life and maintainability.

FIG. 1 shows the brush holder assembly with a brush; in fig. 2 - spring before installation in the brush holder of FIG. 3 shows the node I in FIG. 1, in the off position of the spring (before installing it on the brush); in fig. 4 - the same, in the working position of the spring.

The brush holder includes a housing 1 in which a support 2 is mounted with a coil spring fixed thereto 3. At the end of the coil spring fixed on the support, a compensating Z-shaped loop 4 is made. On the support 2, a notch is made in the notch

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6 on the side of the support opposite to the placement of the coil spring 3. Stand

6 faces against the direction of the spring coil 3. Loop 4 is attached to the end of the slot 7 with the possibility of its contact with the protrusion 6 for fixing the end of the loop in the support 2 in the spring operating position. Worker is the position of the spring 3 when it is wound on the non-working end of the brush 8 and presses it against the rotating collector 9 mounted on the shaft 10 of the electric machine.

The device works as follows.

When installing the coil spring 3 into the support 2 of the brush holder, the end 7 of the compensating Z-shaped loop 4 enters the notched slot 5 of the support. Fig. 3 shows the radius R, the bendings of the end 7 for inserting this end of the loop into the slit and the radius Rj of forming the loop from the straight part of the coil spring 3. The end 7 fits tightly into the slit 5 and keeps the spring from falling out. During the delivery of the brush 8, the spring 3 is unwound (the unwinding direction is shown in Fig. 4 by the arrow), the loop 4 is pulled out and when the brush is mounted on the collector 9, the spring 3 is in the working position, and the radius R of the compensation loop 4 changes the Pp value to Rj loop is shifted to

the slots 5 of the support 2 and the protrusion 6, in contact with the end 7 of the loop 4, securely fixes the loop hinged to the neck, thereby securing the spring 3 on the support 2. The remaining stock of the length of the Z-shaped loop located at the place of embedding the coil spring, which left The stretched part of the spring 3 does not perceive the inevitable movements of the folded spring in operation, associated with the vibration of the brush 8, the distortions of the brush, etc., without destroying the spring at the place of its embedding on support 2. Compared to the prototype device providing possibility By changing the position of the spring in the brush holder housing after its attachment, but not having a free position of the spring end at the place of its insertion in the spring working position, the proposed device, in which the spring end is not rigidly embedded, provides an increased cycle of continuous spring operation until the break, which indicates a longer service life of the device in comparison with the known devices, while simplifying the assembly and reassembly of the spring with the support upon exit of the spring, i.e. improved maintainability of the brush holder.

For smoother operation of the spring, a micro-relief can be applied on its surface A.

Claims (1)

Invention Formula A brush holder comprising a housing in which a support is mounted with a coil spring fixed thereto, characterized in that, in order to increase service life and maintainability, a compensated Z-loop is made at the end of the coil spring fixed on the support a slit is made to form a notch on a protrusion on the side of the support opposite to the placement of the coil spring; the protrusion faces the direction of the spring unwinding; ohm for fixing the end of the loop in the support in the working position of the spring. Фа2.2 (rig. 3 9igM