| 摘要 |
An electric fan includes a fan base ( 10 ), a bearing ( 40 ) and a rotor assembly ( 20 ). The fan base forms a central tube ( 11 ) receiving the bearing therein. The rotor assembly includes a fan hub ( 22 ), and a pivot axle ( 23 ) joined to the fan hub. The pivot axle pivotably extends into the bearing. The bearing has an outer wall ( 41 ) with a plurality of bulwarks ( 45 ) circumferentially formed thereon. At least one partition hole ( 424, 43 a) corresponding to the bulwarks is defined in the bearing. The at least one partition hole effectively prevents a radially inward pressure exerted by the central tube on the bearing from being exerted to the pivot axle via the bearing. Therefore, a friction between the bearing and the pivot axle is reduced.
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