AU2011100988A4

AU2011100988A4 - Carbon brush structure

Info

Publication number: AU2011100988A4
Application number: AU2011100988A
Authority: AU
Inventors: Guoyang Zhang
Original assignee: Hengdian Group Linix Motor Co Ltd
Current assignee: Hengdian Group Linix Motor Co Ltd
Priority date: 2011-08-09
Filing date: 2011-08-09
Publication date: 2011-11-17
Anticipated expiration: 2019-08-09

Abstract

Abstract The invention relates to a carbon brush structure, belonging to the technical field of motor manufacture. The carbon brush structure comprises a carbon brush positioning plate, and the center of the carbon brush positioning plate is provided with a central hole for penetration of a commutator. The carbon brush structure is characterized in that two carbon brushes which are centrosymmetric around the central hole are disposed on the carbon brush positioning plate, both carbon brushes are L shape, one end of each L-shaped carbon brush is pivoted with the carbon brush positioning plate, a torsion spring is arranged on each pivot, and one end of the torsion spring acts on the carbon brush such that the free end of the carbon brush tends to press the central hole. The carbon brush structure has simple structure, greater length and longer service life, and can ensure tight contact between the carbon brush and the commutator, solving the problems that the traditional carbon brush has limited length, fast abrasion in use, short service life, complex structure, etc.

Description

Description CARBON BRUSH STRUCTURE Technical field The invention relates to a carbon brush structure, belonging to the technical field of motor manufacture. Background art In the prior art, a carbon brush is usually positioned on a brush holder plate through a brush holder, for example, a brush holder assembly (patent application No. CN200720311721.X), four brush holders and electric brushes are evenly distributed on a brush holder plate in the circumferential direction of the brush holder plate, the four electric brushes are divided into two groups, two opposite electric brushes are in the same group, the two electric brushes of each group are respectively fixedly and electrically connected with both ends of a lead wire, the middle part of the lead wire is fixedly and electrically connected with the inner end of a screw bolt used as a terminal, the screw bolt is fixed to the brush holder plate and a rear end cover, and the outer end of the screw bolt penetrates through the end cover to be connected with a power cord. In the above technical scheme, the carbon brush is usually of a straight bar structure with limited length and is worn faster in use, thereby having short service life and complex structure. Summary of the invention The object of the invention is to provide a carbon brush structure with simple structure, greater length and longer service life and capable of ensuring tight contact between a carbon brush and a commutator, solving the problems that the traditional carbon brush has limited length, fast abrasion in use, short service life, complex structure, etc. The above technical object of the invention is realized by the following technical scheme: the carbon brush structure comprises a carbon brush positioning plate, and the center of the carbon brush positioning plate is provided with a central hole for penetration of a commutator. The carbon brush structure is characterized in that two carbon brushes which are centrosymmetric around the central hole are disposed on the carbon brush positioning plate, both carbon brushes are L shape, one end of each L-shaped carbon brush is pivoted with the carbon brush positioning plate, a torsion spring is arranged on each pivot, and one end of the torsion spring acts on the carbon brush such that the free end of the carbon brush tends to press the central hole. Because the carbon brush is L shape, the carbon brush is lengthened sufficiently. Meanwhile, under the action of the torsion spring, the carbon brush can always tightly contact with the commutator, the length of the carbon brush is increased, and thus, the service life of the carbon brush is prolonged. Preferably, the inner corner of the L-shaped carbon brush is a smooth curve in transition, ensuring the stability of the carbon brush. Preferably, the width of the part of the carbon brush pivoted with the carbon brush positioning plate is greater than the width of the free end of the carbon brush, ensuring the reliability of pivot connection between the carbon brush and the carbon brush positioning plate. Therefore, the invention has the advantages of simple structure, greater length and longer service life, and can ensure tight contact between the carbon brush and the commutator. Brief description of the drawing Figure 1 is a structural diagram of the invention. Detailed description of the embodiment The technical scheme of the invention is further described by combining the following embodiment and drawing. Embodiment 1: referring to figure 1, the carbon brush structure comprises a carbon brush positioning plate 1, the center of carbon brush positioning plate I is provided with a central hole 3 for penetration of a commutator 2, two carbon brushes 4 which are centrosymmetric around the central hole are disposed on the carbon brush positioning plate 1, both carbon brush 4 are L shape, one end of each L-shaped carbon brush 4 is pivoted with the carbon brush positioning plate 1, a torsion spring 5 is arranged on each pivot, one end of the torsion spring 5 acts on the carbon brush 4 such that the free end of the carbon brush tends to press the central hole 3 and thus the carbon brush 4 always tightly contacts with the commutator 2, the inner corner of the L-shaped carbon brush is a smooth curve in transition, and the width of the carbon brush pivoted the carbon brush positioning plate is greater than the width of the free end of the carbon brush. Because the carbon brushes are L shape, the carbon brushes are lengthened sufficiently. Meanwhile, under the action of the torsion spring, the carbon brushes can always tightly contact with the commutator, the length of the carbon brushes is increased, and thus, the service life of the carbon brushes is prolonged.

Claims

1. A carbon brush structure comprising a carbon brush positioning plate, the center of the carbon brush positioning plate being provided with a central hole for penetration of a commutator, characterized in that two carbon brushes which are centrosymmetric around the central hole are disposed on the carbon brush positioning plate, both carbon brushes are L shape, one end of each L-shaped carbon brush is pivoted with the carbon brush positioning plate, a torsion spring is arranged on each pivot, and one end of the torsion spring acts on the carbon brush such that the free end of the carbon brush tends to press the central hole.

2. The carbon brush structure according to claim 1, characterized in that the inner corner of the L-shaped carbon brush is a smooth curve in transition.

3. The carbon brush structure according to claim I or 2, characterized in that the width of the part of the carbon brush pivoted with the carbon brush positioning plate is greater than the width of the free end of the carbon brush.