| 摘要 |
A relative movement of a fan 1 toward a motor 2, which is one of the relative movements of the fan 1 with respect to a rotating shaft 23, is restricted by an inner ring 221 of a radial bearing 22. Due to this, the relative movement of the fan 1 toward the motor 2 is restricted by the inner ring 221 when the joining force between the fan 1 and the rotary shaft 23 is decreased, so that the contact between the fan 1 and the housing 21 can be prevented. Moreover, as the inner ring 221 rotates together with the rotating shaft 23, a rotational force is transferred from the inner ring 221 to the fan 1 in a state in which the relative movement of the fan 1 toward the motor 2 is restricted by the inner ring 221.
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