Patent ID: 7156157

Claim:
A cooling mechanism, comprising: a heat conductive unit having a plurality of heat radiating fins, a plurality of air gaps being formed among said heat radiating fins, said heat radiating fins and said air gaps defining an attachment face of circular rim; and a fan mounted on said attachment face of said heat conductive unit, said fan including a fan wheel, said fan wheel further comprising a wheel hub and a plurality of blades arranged around said wheel hub, said blades of the fan extending in a radial direction over a distance significantly exceeding said rim of said attachment face of said heat conductive unit, whereby air flow driven by said fan will pass through said air gaps of said heat conductive unit as well as a lateral outer portion of said heat conductive unit; wherein said fan further includes a fan bracket provided with a plurality of through holes, an inner space of said fan bracket defining an air passage, a hub mount being installed at the axial center of said fan bracket for pivotally mounting said fan wheel, said hub mount being connected to an inner wall of said fan bracket through a plurality of connecting beams, and whereby a radial outer spacing will be formed between said attachment face and said air passage; and wherein said connecting beams are respectively provided with retaining pieces for enhancing the attachment of said fan on said heat conductive unit.