Fan structure

Abstract

A fan structure includes a base having a receiving section; a sleeve defining a receiving space therein, and having a shaft hole communicating with the receiving space and an engaging end for engaging with the receiving section of the base; a bearing having an axial bore and received in the sleeve; and an insulating rack externally fitted around the sleeve and having a holding section for holding at least one silicon steel plate set therein, which is spaced from the sleeve by at least one first space. With these arrangements, heat produced by the silicon steel plate set during fan operation is isolated by the first space from directly damaging the bearing. Further, since the bearing is stably held in place in the sleeve without the need of using any bonding material, the fan structure can have extended service life and reduced manufacturing cost.

1 . A fan structure, comprising:
 a base including a receiving section;   a sleeve defining a receiving space therein, and having a shaft hole communicating with the receiving space and an engaging end for engaging with the receiving section of the base;   at least one bearing each having an axial bore and being received in the receiving space in the sleeve; and   at least one insulating rack being externally fitted around the sleeve, and having a holding section for holding a silicon steel plate set therein; and the silicon steel plate set being spaced from the sleeve by at least one first space.   
     
     
         2 . The fan structure as claimed in  claim 1 , wherein the silicon steel plate set and the insulating rack are externally wound by a plurality of windings. 
     
     
         3 . The fan structure as claimed in  claim 1 , wherein the insulating rack includes a first receiving recess and a second receiving recess, and the holding section being located between the first and the second receiving recess. 
     
     
         4 . The fan structure as claimed in  claim 1 , wherein the base further includes an oil reservoir. 
     
     
         5 . The fan structure as claimed in  claim 1 , wherein the bearing has a shaft inserted therein, and the shaft having an end extended through the shaft hole on the sleeve into the axial bore in the bearing, and an opposing end connected to a rotor of the fan structure.