Sliding contact material for motor brush, motor brush, and direct current motor

Abstract

The present invention is drawn to a sliding contact material for a motor brush, the sliding contact material containing: pure Ag as a matrix; and ZnO particles and Ta2O5 particles dispersed in the matrix, wherein the sliding contact material has a ZnO particle content of 0.1% by mass or more and 12% by mass or less and a Ta2O5 particle content of 0.1% by mass or more and 6.0% by mass or less. The present inventive sliding contact material is preferable as a constituent material of motor brushes of small DC motors, satisfactory in mechanical wear resistance and spark resistance, and superior in low-noise characteristics. In addition, the present invention is drawn to a sliding contact material that is capable of substituting for Ag—Pd-based alloys, which have become expensive because of the recent increase in palladium price.

Dependencies are inferred from the claim text.