CN201511356U - Electric tool provided with novel brush holder structure - Google Patents

Abstract

The utility model discloses an electric tool provided with a novel brush holder structure. The electric tool comprises an electric tool casing, a brush holder and a carbon brush; and a projection for preventing a spring of the carbon brush from extending out of an inner hole of a copper part is arranged on the lower edge of the inner hole of the copper part of the brush holder. The electric tool has a reasonable structure, and can effectively protect the copper bar of a commutator, thereby greatly prolonging the service life of a motor.

Description

Electric tool with novel brush carrier structure

Technical field:

The utility model relates to a kind of electric tool

Background technology:

Existing electric tool, as shown in Figure 1, brush carrier 12 is installed on the electric tool casing 11, and carbon brush 14 is installed in the brush carrier 12.During machine operation, stator current flows to carbon brush 12, contacts with commutator copper bar 15 by carbon brush 14, and electric current flows to commutator copper bar 15 again.When carbon brush 14 wore up to the limit, as shown in Figure 2, brush holder spring 13 will contact with commutator copper bar 15, and damaged commutator copper bar 15 surfaces, made commutator copper bar 15 surface irregularities.After changing carbon brush, when motor when rotating at a high speed because the commutator copper bar surface irregularity causes carbon brush to produce shake, the commutator face spark strengthens, and finally causes rotor to shorten service life.

Summary of the invention:

It is a kind of rational in infrastructure that the purpose of this utility model is to provide, and makes the electric tool of the novel brush carrier structure of having of motor long service life.

Technical solution of the present utility model is:

A kind of electric tool with novel brush carrier structure comprises electric tool casing, brush carrier, carbon brush, it is characterized in that: in brush carrier copper spare endoporus lower edge, the projection that the spring that stops carbon brush stretches out from copper spare endoporus is set.

The utility model is rational in infrastructure, can protect commutator copper bar effectively, and motor is prolonged service life greatly.

Description of drawings:

The utility model is described in further detail below in conjunction with drawings and Examples.

Fig. 1, Fig. 2 are the electric tool structure diagrammatic sketch of existing conventional structure.

Fig. 3 is the configuration diagram of an embodiment of the utility model.

Fig. 4 is the state diagram of Fig. 3 embodiment when carbon brush may wear to the limit.

The specific embodiment:

Fig. 3 is a kind of electric tool with novel brush carrier structure, comprises electric tool casing 1, brush carrier 2, carbon brush 4, in the endoporus lower edge of brush carrier copper spare 6, the projection 7 that the spring that stops carbon brush stretches out from copper spare endoporus is set.When carbon brush 4 may wear to the limit, as shown in Figure 4, the endoporus edge protuberance 7 of copper spare stoped brush holder spring 3 directly to contact with rotor commutator 5, thereby has protected commutator copper bar effectively, can prolong the service life of rotor.

Claims (1)

1. the electric tool with novel brush carrier structure comprises electric tool casing, brush carrier, carbon brush, it is characterized in that: in brush carrier copper spare endoporus lower edge, the projection that the spring that stops carbon brush stretches out from copper spare endoporus is set.

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