OIL-IMPREGNATED BEARING AND SMALL-SIZED MOTOR PROVIDED WITH THE SAME

摘要

PROBLEM TO BE SOLVED: To provide an oil-impregnated bearing structure which can retain enough oil, then to obtain a small-sized motor with high productivity and long lifetime, in a small-sized motor used for AV equipment. SOLUTION: The small-sized motor comprising: a sintered oil-impregnated bearing 23 having a first cylindrical part 23a which configures a bearing surface, a second cylindrical surface 23b formed on the axial end face of the bearing 23 with a larger diameter than the cylindrical inner diametral part thereof, and a chamfered surface 23c formed on the boundary between the first cylindrical part and the second cylindrical part; a shaft 26 supported therewith; and a thin plate washer 29 mounted on the shaft and disposed opposite to the end face of the sintered oil-impregnated bearing.