Patent ID: 6544011
Filing Date: 2003-04-08
Classification: F04D

Abstract:
A heat dissipation fan comprising:a casing having a base with a cavity defined in a top of the base; a sleeve pressed onto the base; a stator pressed onto the sleeve; a lubricating bushing with lubricant contained therein and mounted in the sleeve; a fan rotatably mounted in the casing and having a permanent magnet to serve as a rotor; a shaft extending from the fan and through a passage defined through the lubricating bushing; a locking disk securely mounted on a free end of the shaft to lock the shaft in the lubricating bushing; and an oil guide arranged on the lubricating bushing through which the lubricant recycles when the dissipation fan is operating, wherein a protusion with a diameter smaller than that of the lubricating bushing axially extends from the lubricating bushing so as to define an annular space around the protusion when the lubricating bushing is pressed into the sleeve; a chamber is defined in a free end of the protrusion and communicates with the passage in the lubricating bushing; at least one notch is defined in the free end of the protrusion and communicates with the chamber and the annular space around the protrusion; and at least one oil groove is longitudinally defined in an outer periphery of the lubricating bushing and communicates with the annular space around the protrusion, thereby an oil guide constructed of the chamber in the protrusion, the passage in the lubricating bushing, the at least one oil groove, the annular space around the protusion and the at least one notch is provided.