| 摘要 |
A motor includes a base, a stator and a bearing both mounted to the base, a rotor and a retaining ring. The rotor includes a shaft having an annular groove formed in an outer periphery thereof to form a neck with a first outer diameter. The shaft includes an obstructing portion forming an end edge of the annular groove and having a second outer diameter larger than the first outer diameter. The retaining ring is partially received in the annular groove. The retaining ring includes a combining section for positioning itself and a retaining section delimiting a through hole with a diameter larger and smaller than the first and second outer diameters respectively to form a gap between the through hole and neck. Consequently, noise by friction of the retaining ring against the shaft and departure of the rotor from the base are avoided with unlimited assembly of the motor.
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