Oil-retaining structure on fan rotor

Abstract

An oil-retaining structure on fan rotor includes a rotor body, a rotor shaft, and an oil-retaining portion. The rotor body has an open end and a closed end, on an inner side of which the oil-retaining portion is formed. The oil-retaining portion includes an annular recess, which has an oil-retaining edge and an oil-retaining surface extended between the oil-retaining edge and a bottom of the annular recess. The rotor shaft has a first end connected to the oil-retaining portion and a second end extended through a bearing of a fan. Since the oil-retaining portion is coated with a layer of oil-repellant agent, lubricant oil being centrifugally pulled out of the bearing when the fan operates and caught by the annular recess can quickly flow back to the bearing without remaining in the annular recess due to a capillary action. Therefore, the fan can have increased service life and upgraded operating efficiency.

1 . An oil-retaining structure on fan rotor, comprising:
 a rotor body having an open end and a closed end;   a rotor shaft having a first end and a second end, and the first end being connected to an inner side of the closed end of the rotor body; and   an oil-retaining portion being formed on the inner side of the closed end of the rotor body, and including an annular recess externally located around and spaced from the first end of the rotor shaft; the annular recess having an oil-retaining edge and an oil-retaining surface, the oil-retaining surface being extended between a bottom of the annular recess and the oil-retaining edge, and the oil-retaining portion being coated with an oil-repellant agent.   
     
     
         2 . The oil-retaining structure on fan rotor as claimed in  claim 1 , wherein the rotor body is externally provided with a plurality of fan blades. 
     
     
         3 . The oil-retaining structure on fan rotor as claimed in  claim 1 , wherein the oil-retaining portion, the rotor body and the rotor shaft are concentric with one another. 
     
     
         4 . The oil-retaining structure on fan rotor as claimed in  claim 1 , wherein the rotor body is further provided on the inner side of the closed end with an axially rearward extended shaft receiving portion, into which the first end of the rotor shaft is inserted; and the shaft receiving portion having a height smaller than that of the oil-retaining edge of the annular recess of the oil-retaining portion.