CN201199605Y

CN201199605Y - Position limiter for electric tool carbon brush

Info

Publication number: CN201199605Y
Application number: CNU2008200932538U
Authority: CN
Inventors: 刘支斌
Original assignee: GUANGDONG ELECTRIC POWER TOOLS FACTORY CO Ltd
Current assignee: GUANGDONG ELECTRIC POWER TOOLS FACTORY CO Ltd
Priority date: 2008-04-08
Filing date: 2008-04-08
Publication date: 2009-02-25
Anticipated expiration: 2018-04-08

Abstract

The utility model relates to a limiter for a carbon brush of an electric tool. The limiter comprises a brush gripping frame and a carbon brush component consisting of a carbon brush, a carbon brush spring and a carbon brush contact plate, wherein a bulge is arranged inside the brush gripping frame, and a groove is arranged on the carbon brush. By the design, the carbon brush can be tightly contacted with a motor commutator inside the brushing gripping frame by the help of the elastic force of the spring, and the carbon brush and the motor commutator do not contact after the carbon brush is abraded to the regulated length, simultaneously, the carbon brush spring is ensured not to be contacted with the commutator, therefore, flashover or damage to the commutator which can cause the damage to the motor is avoided.

Description

The stopping means of electric tool carbon brush

Technical field

The utility model relates to the stopping means of electric tool carbon brush.

Background technology

The stopping means of existing electric tool carbon brush is as shown in Figure 1: it establishes a spring 20 to suppress carbon brush 40 in brush holder yoke 10, carbon brush 40 presses engine commutator 30.The stopping means of this carbon brush leans on the length of carbon brush buttock line and bears pulling force and control carbon brush 40.But carbon brush 40 is after using, because the wearing and tearing of carbon brush, easily causes carbon brush grind and spring contact with commutator, generation arcing or damage commutator and make the motor damage.

Summary of the invention

The purpose of this utility model provides a kind of carbon brush that makes and contacts well with commutator, and after carbon brush had ground, spring can not contact with commutator, safe and reliable electric tool carbon brush stopping means.

The purpose of this utility model is achieved in that this stopping means comprises brush holder yoke and the carbon brush component of being made up of carbon brush, brush holder spring, carbon brush contact, it is characterized in that: described brush holder yoke is provided with the square hole of the carbon brush component of packing into, is provided with two kicks near electric tool commutator position in the square hole; The both sides of described carbon brush have the groove of pair of parallel, and this coincide to two kicks in groove and the brush holder yoke square hole; The slightly larger in diameter of brush holder spring is in the width of fluted position carbon brush on the described carbon brush component.

In the above-mentioned design, described brush holder spring and carbon brush contact are fixed together by welding or other modes.Described carbon brush component is that the pulling force by the carbon brush buttock line combines carbon brush buttock line and carbon brush, and and then and brush holder spring, carbon brush contact form as one.Wherein brush holder spring and carbon brush contact are to be fixed together by welding and other modes.

By above design, because the design of projection and carbon brush groove makes carbon brush rely on the elastic force of spring closely to contact with engine commutator in the square hole of brush holder yoke.And since the slightly larger in diameter of spring in the width of fluted position carbon brush, spring is stopped by the kick in the brush holder yoke square hole, thereby no longer contact after making carbon brush wear up to specific length, also can not run into commutator, thereby avoided the damage of motor even carbon brush has ground brush spring with commutator.

Description of drawings

The utility model is described in further detail below by drawings and Examples:

Fig. 1 is the stopping means schematic diagram of existing electric tool carbon brush;

Fig. 2 is a stereochemical structure exploded view of the present utility model;

Fig. 3 is the utility model brush holder yoke planar structure schematic diagram;

Fig. 4 the utility model brush holder yoke vertical view;

Fig. 5 is the drawing in side sectional elevation of the utility model carbon brush;

Fig. 6 is the utility model carbon brush holder group plane graph.

Embodiment

Shown in Fig. 2-6: the utility model comprises 50, one carbon brush components of being made up of carbon brush 61, brush holder spring 62, carbon brush contact 63 60 of a brush holder yoke.Square hole 51 is arranged on the brush holder yoke 50, and square hole 51 is provided with two kicks 52 near electric tool commutator 30 places.Carbon brush 61 both sides form pair of parallel groove 611, and this coincide to two kicks in groove and the brush holder yoke square hole 51, and 52 pairs of carbon brush 61 of kick moving in square hole 51 do not constitute any obstacle.The slightly larger in diameter of the brush holder spring 62 on the carbon brush component 60 is in the width of fluted position carbon brush, and be slightly less than the diameter of brush holder yoke square hole 51, make carbon brush like this after wearing up to certain-length, spring 62 in square hole 51 to the stretching, extension of commutator direction owing to the existence of kick 52 is obstructed, thereby no longer contact after making carbon brush wear up to specific length with commutator, can not run into commutator even carbon brush has ground brush spring yet, so just avoid the motor damage.

Certainly.Kick 52 in the square hole 51 on the utility model brush holder yoke 50 can be processed into one with brush holder yoke, also can be fixed on square hole 51 separately again near commutator one side after brush holder yoke is processed into.

Carbon brush buttock line 64 on the utility model carbon brush component requires that certain intensity is arranged, and can bear certain pulling force, makes carbon brush be difficult for getting loose, and and brush holder spring, carbon brush contact in conjunction with forming one.The carbon brush buttock line is fixed on the carbon brush contact by welding or other modes.

Claims

1. the stopping means of an electric tool carbon brush, comprise brush holder yoke and the carbon brush component of forming by carbon brush, brush holder spring, carbon brush contact, it is characterized in that: described brush holder yoke is provided with the square hole of the carbon brush component of packing into, is provided with two kicks near electric tool engine commutator position in the square hole; Described carbon brush both sides have the groove of pair of parallel, and this coincide to two kicks in groove and the brush holder yoke square hole; The slightly larger in diameter of described brush holder spring is in the width of fluted position carbon brush.

2. according to the stopping means of the described electric tool carbon brush of claim 1, it is characterized in that: the kick on the described brush holder yoke can be processed into one with brush holder yoke or be fixed on the brush holder yoke.

3. according to the stopping means of the described electric tool carbon brush of claim 2, it is characterized in that: described carbon brush component is to become one by the pulling force of carbon brush buttock line and brush holder spring, carbon brush contact.

4. according to the stopping means of the described electric tool carbon brush of claim 3, it is characterized in that: described brush holder spring and carbon brush contact are fixed together by welding or other modes.