Oil-retaining bearing fan structure

Abstract

An oil-retaining bearing fan structure includes a fan base seat, an oil-retaining bearing and at least one magnetic member. The oil-retaining bearing is disposed in a bearing hole of the fan base seat. The magnetic member is disposed between the oil-retaining bearing and a wall of the bearing hole. The magnetic member serves to apply a magnetic attraction force to a shaft of the fan structure to make the shaft quickly restore to its optimal operation position so as to reduce wear and lower the noises and vibration of the fan structure in operation. Therefore, the lifetime of the fan structure can be prolonged.

What is claimed is: 
     
         1 . An oil-retaining bearing fan structure comprising:
 a fan base seat having a bearing cup on one side, the bearing cup having a bearing hole;   an oil-retaining bearing disposed in the bearing hole, the oil-retaining bearing having a shaft hole;   at least one magnetic member disposed between a wall of the bearing hole and the oil-retaining bearing; and   a fan impeller having multiple blades and a shaft, the shaft being rotatably disposed in the shaft hole.   
     
     
         2 . The oil-retaining bearing fan structure as claimed in  claim 1 , wherein a hydraulic layer is filled between the shaft and a wall of the shaft hole. 
     
     
         3 . The oil-retaining bearing fan structure as claimed in  claim 1 , wherein the magnetic member is selected from a group consisting of magnetic iron, magnetic powder body and magnet. 
     
     
         4 . The oil-retaining bearing fan structure as claimed in  claim 1 , wherein the magnetic member is fitted around an outer circumference of the oil-retaining bearing. 
     
     
         5 . The oil-retaining bearing fan structure as claimed in  claim 4 , wherein the magnetic members are fitted around two ends of the oil-retaining bearing. 
     
     
         6 . The oil-retaining bearing fan structure as claimed in  claim 4 , wherein the magnetic member is fitted around one end of the oil-retaining bearing.