Patent ID: 8421319

Claim:
A bearing holder mounting structure configured to mount a bearing holder in a motor housing, comprising: the motor housing having a mounting hole formed therein, in which the bearing holder is fitted to be mounted in the motor housing, the motor housing including an annular fitting recessed portion formed at an outer end of the mounting hole, the bearing holder including: a holder body having a fitting hole formed therein, in which a bearing is fitted; and a flange portion unitarily formed with the holder body and fitted in the annular fitting recessed portion of the motor housing; and a retaining fitting for retaining the bearing holder, disposed outwardly on the flange portion and abutting on the flange portion so that the bearing holder does not come off from the mounting hole of the motor housing, the retaining fitting being fitted in the annular fitting recessed portion of the motor housing and having a larger hardness than a portion of the motor housing where the mounting hole is formed, the retaining fitting including: a ring portion configured to abut on the flange portion of the bearing holder; and a plurality of engaging pieces formed with the ring portion and configured to be engaged on a wall portion surrounding the annular fitting recessed portion, the engaging pieces being disposed at predetermined angular intervals in a peripheral direction of the ring portion and extending from the ring portion outwardly in a radial direction of the ring portion, wherein the material of the retaining fitting and shapes of the engaging pieces and the annular fitting recessed portion are determined such that, when the retaining fitting is pressed into the fitting recessed portion, the engaging pieces warp in an opposite direction to a pressing direction of the retaining fitting and leading ends of the engaging pieces bite in the wall portion due to resilient force by which the engaging pieces return to an original state from a warped state.