Electric motor with ball bearing assembly for rotary shaft

摘要

An electric motor includes a rotor having a rotary shaft, a pair of ball bearings for supporting the rotary shaft, and two brackets having bearing housings for holding the ball bearings. The motor further includes a washer between one of the ball bearings and an end wall of one of the bearing housings. The washer includes a plurality of claws. The washer is configured including a ring-shaped yoke and the claws the center parts of which are fastened to the yoke. These claws are configured to be bent in a U-shape, and the center part of the U-shape is fastened to the yoke.

主权项

1. An electric motor comprising:
a rotor including a rotary shaft; first and second ball bearings supporting the rotary shaft, at least the first ball bearing having a ball, a bearing seal plate and a side wall; first and second brackets including first and second bearing housings that hold the first and second ball bearings, respectively, the first bearing housing having an end wall; and a washer being disposed between the side wall of the first ball bearing and the end wall of the first bearing housing, wherein the bearing seal plate is spaced apart from the ball in a direction along the rotary shaft, the washer includes a plurality of claws, each of the claws protruding in the direction along the rotary shaft, and at least one of the claws faces and is wedged against at least one of the bearing seal plate and the end wall of the first bearing housing so as to generate a frictional force in the circumferential direction between the at least one of the claws and the at least one of the bearing seal plate and the end wall of the first bearing housing.