SU1436156A1 - Brush assembly of electric machine with face commutator - Google Patents

Abstract

The invention relates to electrical engineering, in particular, to the bristle units of electric motors used in manual and portable machines. The aim of the invention is to provide automatic shutdown of the machine when the brushes are worn. The brush assembly includes a housing 1, in which the brush holder 2 with brushes 3 is placed. In the slots of the brush holder, there are earrings 9, which are fastened to each other by a tension spring attached with tension to the ends of the socket. The pressure elements are attached to the end of the brush with bevels 6 and grooves 7 located to the axis of the brush at an obtuse angle measured in a clockwise direction from the indicated axis. 2 Il.

Description

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SP (35

The invention relates to electromechanical design, in particular, to brush assemblies of electric motors used in manual and portable machines.

The purpose of the invention is to provide automatic shutdown of the machine when the brushes are worn.

Figure 1 shows the brush assembly of an electric machine with an end-face collector; Fig. 2 shows the principle of the interaction of the brush; p, the holder and the pressure element. I The electric marine brush assembly with an end collector has an elastic-mass motor housing 1, in which metal-1 brushes 2 with a brush-Ne 3 are in contact with one end | with an end-face collector 4. To the other | end of brushes, the hinge elements 5 are attached to the other end of the brushes with skewed |: 1 surfaces 6 and gases 7 associated with it, located to the axis of the brush 1 and an obtuse angle measured in the direction clockwise from the indicated direction. Stub elements are also inserted into the brush holders. In addition, the upper edges of the bevels 6 on the pressure elements coincide with the front edges of the transverse grooves 8 in the brush holders into which the plastic earrings 9 are inserted, and the upper edge of the rear part of the groove 7 is located somewhat: above the interface point of the groove with the bevel Earrings interlocked with each other by a tension spring 10 attached tightly to the ends of the earrings.

Works brush node as follows.

Pru: -kina 10 in working position tightens the earrings 9 inserted into the transverse grooves 8 of the brush holders 2. The earrings, in turn, through the bevels 6 transmit force to the pressure elements 5, perpendicular to the axis of the spring 10. The pressure elements 5 press brushes 3 to the collector 4. As the brushes wear out, they are also uniformly pressed against the collector. When the brush reaches the limit of wear, the upper end of the earring will come off the bevel 5 at the junction point of the groove 7

with a bevel and go into the groove. Then, interacting with the rear plane of the groove 7 under the action of the spring 10, will push the pressure element 5 together with the pivotally attached brush 3 back. In this case, the brush will move away from the collector 4 and will turn off the electric machine.

With such a design, it doesn’t matter what kind of brushes get started earlier, top or bottom, the electric machine will be disconnected in either case.

The proposed device has simplicity, allows to significantly simplify the production of brush assemblies by manufacturing the minimum number of simple parts, to ensure ease of assembly under the conditions of batch production, and also to facilitate repair and operation. The presence of a simple design disconnecting device increases the reliability of the bots, electric machines and eliminates the possibility of premature failure due to late replacement brushes.

Formula of the invention

Brush unit of electric machine with face collector; comprising a housing in which a brush holder is placed, on the side walls of which there is a transverse groove, a brush placed in the brush holder, a pressure element with a C1 surface, forming an acute angle with the axis of the brush, measured in the clockwise direction from the axis indicated, and holding the slots in the brush holder interacting with the beveled surface of the pressure member, as well as a tension spring attached with tension to the end of the shackle, characterized in that, in order to ensure automatic shut-off during operation All brushes, the pressure element is made with a groove located to the axis of the brush at an obtuse angle measured in the direction of the direction of the arrow from the specified axis.

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Claims (1)

Claim % A brush assembly of an electric machine with an end collector, comprising a housing in which a brush holder is placed, a transverse groove is made on the side walls of the brush, a brush placed in the brush holder, a pressing element with a worn surface forming an acute angle measured with the brush axis in the clockwise direction from the indicated axis, placed in the grooves of the brush holder, an earring interacting with the beveled surface of the pressing element, as well as a tension spring attached with an interference fit to the end of the earring, characterized in that, in order to ensure automatic shut-off when the brush is worn, the push element is made with a groove located at an obtuse angle to the brush axis, measured in the direction along the tip arrow from the specified axis.