Fan bearing retaining structure

Abstract

A fan bearing retaining structure includes a fan base seat having a bearing cup having a bearing hole. An inner circumferential wall of the bearing hole is formed with at least one restriction section and at least one recessed section. At least one elastic member and at least one retainer member are respectively positioned at the restriction section and the recessed section. A bearing is positioned between the elastic member and the retainer member. The elastic member serves to provide elastic force to tightly attach the bearing to the retainer member. Under such circumstance, the bearing is prevented from rotating or sliding within the bearing hole so as to avoid wear or failure of the bearing. Accordingly, the rotor assembly can smoothly operate.

What is claimed is:  
     
         1 . A fan bearing retaining structure comprising:
 a fan base seat having a bearing cup on one side, the bearing cup having a bearing hole, an inner circumferential wall of the bearing hole being formed with at least one restriction section and at least one recessed section, at least one elastic member and at least one retainer member being disposed in the bearing hole and respectively correspondingly positioned at the restriction section and the recessed section, a bearing being positioned between the elastic member and the retainer member;   a stator assembly fitted around the bearing cup; and   a rotor assembly including multiple blades and a shaft, the shaft being rotatably disposed in the bearing hole and fitted through the bearing.   
     
     
         2 . The fan bearing retaining structure as claimed in  claim 1 , wherein the bearing cup has a top section and a bottom section. 
     
     
         3 . The fan bearing retaining structure as claimed in  claim 2 , wherein the inner circumferential wall of the bearing hole is formed with two restriction sections and two recessed sections, one of the restriction sections being formed on the inner circumferential wall of the bearing hole at the top section, while the other of the restriction sections being formed on the inner circumferential wall of the bearing hole at the bottom section, one of the recessed sections being formed on the inner circumferential wall of the bearing hole at the top section, while the other of the recessed sections being formed on the inner circumferential wall of the bearing hole at the bottom section. 
     
     
         4 . The fan bearing retaining structure as claimed in  claim 1 , wherein the shaft is rotatably disposed in the bearing hole and fitted through the elastic member and the retainer member. 
     
     
         5 . The fan bearing retaining structure as claimed in  claim 1 , wherein the stator assembly includes multiple windings and at least one silicon steel sheet, the windings being wound around the silicon steel sheet.