Fan structure

Abstract

A fan structure includes a rotation module, a fixing shaft and an impeller, the rotation module comprises a coupling base, a bearing and a sealing member. The bearing comprises an axial hole, an outer ring wall and a through hole, a slot is recessed from the outer ring wall, the through hole communicates with the slot and the axial hole, and the slot is sealed by the sealing member to form an oil storage space. The fixing shaft penetrates the axial hole, and the through hole communicates with the axial hole and the oil storage space. When the rotation module rotates, lubricants in the oil storage space can flow from the through hole to the axial hole for lubricating the fixing shaft and the axial hole. When the rotation module stops, lubricants in the axial hole reflow to the oil storage space via the through hole to avoid loss.

What is claimed is: 
     
         1 . A fan structure includes:
 a rotation module having a coupling base, a bearing and a sealing member, the coupling base comprises a ring wall and an accommodating slot surrounded by the ring wall, the bearing disposed at the accommodating slot comprises an axial hole, an outer ring wall and a through hole, wherein a slot is recessed from the outer ring wall, the through hole is in communication with the slot and the axial hole, and the slot is sealed by the sealing member so as to form an oil storage space;   a fixing shaft penetrating the axial hole of the bearing, said fixing shaft is revealed by the through hole of the bearing, and the through hole is in communication with the axial hole and the oil storage space; and   an impeller coupled to the coupling base.   
     
     
         2 . The fan structure in accordance with  claim 1 , wherein the outer ring wall of the bearing is coupled to the ring wall of the coupling base. 
     
     
         3 . The fan structure in accordance with  claim 1 , wherein the axial hole of the bearing comprises a hole surface, and a return chute is recessed from the hole surface and communicates with the through hole of the bearing. 
     
     
         4 . The fan structure in accordance with  claim 3 , wherein the return chute is an arc-shaped slot. 
     
     
         5 . The fan structure in accordance with  claim 3 , wherein a storage slot is recessed from the fixing shaft and communicates with the return chute of the bearing. 
     
     
         6 . The fan structure in accordance with  claim 1 , wherein the sealing member is disposed between the slot of the bearing and the ring wall of the coupling base. 
     
     
         7 . The fan structure in accordance with  claim 6 , wherein the sealing member comprises a protruding ring contacting against the slot and the ring wall of the coupling base. 
     
     
         8 . The fan structure in accordance with  claim 6 , wherein the bearing further comprises a hook embedded into the sealing member. 
     
     
         9 . The fan structure in accordance with  claim 8 , wherein the slot comprises a bottom surface, the hook of the bearing is disposed at the bottom surface of the slot. 
     
     
         10 . The fan structure in accordance with  claim 1 , further includes a fastening member, the coupling base further comprises a top end portion in connection with the ring wall, a fastening slot is recessed from the fixing shaft, wherein the fastening member is disposed between the top end portion and the bearing, and the fastening member couples to the fastening slot.