Patent ID: 7939980
Filing Date: 2011-05-10
Classification: F16C,H02K

Abstract:
1. A motor comprising: a stator; an end bracket having a bearing hole formed therein, and mounted on the stator; a ball bearing fitted in the bearing hole of the end bracket; a shaft supported by the ball bearing; a rotor member fixed on the shaft; and a stopper fitting for fixing the ball bearing in the bearing hole, the end bracket having an annular recessed portion formed therein to be fitted with the stopper fitting, wherein hardness of a portion of the end bracket where the recessed portion is formed is smaller than hardness of the stopper fitting; and the stopper fitting including an abutting portion abutting on an outer race portion of the ball bearing, and a plurality of engaging pieces integrally formed with the abutting portion and engaged in the recessed portion, the engaging pieces being disposed at an angular interval in a circumferential direction of the abutting portion and extending radially outwardly from the abutting portion, wherein material quality of the stopper fitting and shapes of the engaging pieces and the recessed portion are determined such that leading ends of the engaging pieces are engaged in a wall surface of the recessed portion.