Fan

Abstract

A fan includes a base and an impeller rotatably mounted on the base. The base protrudes a tube outwardly therefrom. The tube defines a receiving hole therein for receiving a bearing. The bearing defines a bearing hole therein. The impeller protrudes a shaft therefrom towards the base. The shaft is rotatably received in the bearing hole. The fan further includes a gasket located at a bottom of the bearing and clipped on a free end of the shaft. The gasket includes a first surface and an opposite second surface. The first surface is a smooth surface and facing directly the bottom surface of the bearing. The second surface is a rough surface relative to the first surface. At least one of the first surface and the second surface is provided with a mark to differentiate the rough second surface from the smooth first surface.

1 . A fan comprising:
 a base with a bearing tube protruding outwardly from the base, the bearing tube defining a receiving hole therein, a bearing received in the receiving hole, the bearing defining a bearing hole therein;   an impeller rotatably mounted on the base, a shaft protruding from the impeller towards the base, the shaft being rotatably received in the bearing hole; and   a gasket received in the receiving hole and located at a bottom surface of the bearing, and the gasket being clipped on a free end of the shaft, the gasket comprising a first surface and an opposite second surface, the first surface being a smooth surface and facing the bottom surface of the bearing, the second surface being a rough surface relative to the first surface, at least one of the first surface and the second surface being provided with a mark to differentiate the rough second surface from the smooth first surface.   
     
     
         2 . The fan of  claim 1 , wherein the mark is a color mark. 
     
     
         3 . The fan of  claim 2 , wherein only one of the first surface and the second surface is marked with a color mark. 
     
     
         4 . The fan of  claim 1 , wherein the first surface and the second surface are marked with different cutting lines as the differentiating marks. 
     
     
         5 . The fan of  claim 1 , wherein only one of the first surface and the second surface is marked with a type of cutting lines as the mark. 
     
     
         6 . The fan of  claim 1 , wherein the gasket defines a through hole and a slot therein, the slot runs through the first surface and the second surface of the gasket and communicates with the through hole, the shaft of the impeller defines an annular recess at the free end thereof, the shaft extends through the through hole of the gasket, and the gasket clips in the recess of the shaft. 
     
     
         7 . The fan of  claim 1 , wherein the bearing tube comprises a closed end, an oil reservoir is formed in the receiving hole near the closed end, the oil reservoir communicates with the receiving hole, an inner diameter of the oil reservoir is smaller than that of the receiving hole, and an annular step is formed on an inner wall of the bearing tube between the oil reservoir and the receiving hole, the gasket is located between the bottom surface of the bearing and the step of the bearing tube. 
     
     
         8 . The fan of  claim 1 , wherein the gasket is made of metal or plastic. 
     
     
         9 . The fan of  claim 8 , wherein the gasket is made of polyethylene terephthalate. 
     
     
         10 . The fan of  claim 1 , wherein the gasket is made through punching.