Shaft grounding thread structure of an electric motor

Abstract

Thread structure for the shaft grounding of an electric motor having a thin thread formed on the surface of the slip ring or the shaft to replace the conventional face contact with the “linear contact” between the surface of the carbon brush and the thread head. During the rotation, the development of friction heat and the oxidation film will be substantially eliminated. Furthermore, the effect of spiral conveyor belt is created when the thread rotates. This can remove the toner, copper powder, etc. produced by friction acting on the surface of the carbon brush and keep a permanent cleanness of the surface of the carbon brush. In this way, a stable contact resistance between the shaft (or the slip ring) and the carbon brush can be maintained and a long-term test shows that the wear of the carbon brush will be further reduced before improvement.

Dependencies are inferred from the claim text.