COOLING FAN AND ROTOR OF COOLING FAN

摘要

A cooling fan includes a frame and a rotor received in the frame. The rotor includes a hub, blades extending outwardly and radially from the hub, and a cover plate connected with the hub. The hub includes a top wall and a sidewall extending from a circumference of the top wall. The top wall of the hub defines a plurality of blind holes on an outer surface thereof, and the blind holes are shaded by the cover plate.