Patent ID: 9624935
Date: 2017-04-18
CPC Classifications: F04D,F05D

Claim:
1. A cooling fan, comprising: a base; a central tube made of polyoxymethylene, the central tube having a bottom plate mounted on the base and a peripheral sidewall extending upward from a peripheral edge of the bottom plate; a blind hole, wherein the blind hole is defined by and located between the bottom plate and the sidewall; a stator mounted around peripheral of the sidewall of the central tube; a rotor, the rotor being rotatable relative to the stator, the rotor comprising a hub and a shaft extending from the hub, the shaft having a free end received in the blind hole and directly abutting the bottom plate, wherein a bottom extremity of the free end directly abuts and contacts the bottom plate of the central tube; and an annular clasp received in the blind hole, the annular clasp comprising an inner edge, wherein the inner edge of the clasp engages with an outer circumferential surface of the free end.