Dust-protective cycling lubricating structure of an electric fan

Abstract

An dust-protective cycling lubricating structure of an electric fan is disclosed to include a hub defining a receiving chamber, a shaft rotatably mounted in the hub, an axle bearing mounted in the receiving chamber to support the shaft and defining with a top cover of the hub an oil-spreading space and a bottom cover of the hub an oil accumulation space. Lubricating oil is guided upwards by guide grooves on the shaft to lubricate the shaft and the axle bearing and to be further spread over the oil-spreading space and then returned to the oil accumulation space due to the effect of the centrifugal force during rotation of the shaft with a fan blade assembly.

1 . A dust-protective cycling lubricating structure comprising: 
 a hub, said hub comprising an axially extending center barrel, said center barrel defining a receiving chamber, a top cover covered on a top side of said receiving chamber, and a bottom cover covered on a bottom side of said receiving chamber;    a shaft inserted through said center barrel, said top cover and said bottom cover and rotatable relative to said hub;    at least one axle bearing mounted in said receiving chamber of said center barrel around said shaft to support said shaft in said center barrel, said at least one axle bearing each having a center axle hole for the passing of said shaft and a plurality of longitudinal oil grooves formed between said axle bearings and said center barrel of said hub, said at least one axle bearing defining with said top cover an oil-spreading space in a top side of said receiving chamber and defining with said bottom cover an oil accumulation space in a bottom side of said receiving chamber.    
   
   
       2 . The dust-protective cycling lubricating structure as claimed in  claim 1 , further comprising a plurality of flow guide ribs suspending in said oil-spreading space.  
   
   
       3 . The dust-protective cycling lubricating structure as claimed in  claim 1 , wherein said shaft has at least one guide groove on the periphery thereof between said axle bearings and said oil accumulation space for sucking lubricating oil upwards from said oil accumulation space upon rotation of said shaft.  
   
   
       4 . The dust-protective cycling lubricating structure as claimed in  claim 1 , wherein said shaft has a top end extending out of said top cover and mounted with a fan blade assembly and a bottom end extending out of said bottom cover, said bottom end of said shaft having a locating groove extending around the periphery thereof and a retaining ring fastened to said locating groove to secure said shaft to said center barrel.  
   
   
       5 . The dust-protective cycling lubricating structure as claimed in  claim 1 , wherein said top cover is formed integral with a top side of said center barrel.  
   
   
       6 . The dust-protective cycling lubricating structure as claimed in  claim 1 , wherein said bottom cover is formed integral with a bottom side of said center barrel.  
   
   
       7 . The dust-protective cycling lubricating structure as claimed in  claim 1 , further comprising a solidified oil filled up gaps between the center through holes of said top and bottom covers and the periphery of said shaft.  
   
   
       8 . The dust-protective cycling lubricating structure as claimed in  claim 1 , wherein said at least one axle bearing each has a porous structure.  
   
   
       9 . The dust-protective cycling lubricating structure as claimed in  claim 1 , further comprising an elastic porous oil retainer mounted in said oil accumulation space inside said center barrel around said shaft for retaining lubricating oil, said elastic porous oil retainer made out of sponge having a through hole.  
   
   
       10 . The dust-protective cycling lubricating structure as claimed in  claim 1 , wherein said longitudinal oil grooves can be on the periphery of each of said axle bearing.  
   
   
       11 . The dust-protective cycling lubricating structure as claimed in  claim 1 , wherein said longitudinal oil grooves can be on the inside wall of said center barrel of said hub.