| 摘要 |
An electric fan, which includes a body having a center shaft defining an axially extended center axle hole, a fan blade assembly having a hub and an axle axially disposed at the center of the hub and coupled to the center axle hole of the center shaft, and a lubricating axle bearing mounted within the axle hole of the center shaft around the axle, wherein the center shaft has a stop flange axially forwardly raised from the periphery of the top end thereof and defining a receiving chamber; the hub has an oil groove on the inside around the axle for receiving lubricating oil from the lubricating axle bearing when the electric fan is turned upside-down during a repair work; an oil return wheel is mounted on the axle and received in the receiving chamber defined within the stop flange of the center shaft for guiding lubricating oil back from the oil groove to the lubricating axle bearing after a repair work of the electric fan.
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