Abstract: A heat-dissipation fan comprises a hollow cylinder body, a fixing pillar, a stator, a fan wheel, a bearing and bearing plate. The fixing pillar comprises a free end and a fixing end fixed at the hollow cylinder body. The stator is installed at the hollow cylinder body being installed at the bearing plate. The fan wheel comprises a top plate, an outer ring wall, an inner ring wall and a penetration hole formed at the top plate. The inner ring wall surrounds the penetration hole, the hollow cylinder body and the stator are located between the outer ring wall and the inner ring wall, and the bearing is coupled to the inner ring wall. The free end of the fixing pillar is protruded to a top surface of the top plate, which results a supporting surface and the top surface being spaced apart by a first spacing.

Abstract: A fan structure includes a sleeve, an impeller, a bearing and a fixing shaft, wherein the sleeve is covered with a hub of the impeller. The sleeve comprises a ring wall, an accommodating slot and a top portion, and a penetration hole is formed at the top portion. The bearing is disposed at the accommodating slot and comprises an axial hole and a top surface, wherein the top surface of the bearing and the top portion are spaced apart from each other by an interval. The fixing shaft penetrates through the axial hole of the bearing, a free end of the fixing shaft is protruded to the top portion via the penetration hole, and an oil storage space can be defined between the top portion of the sleeve, the top surface of the bearing and the fixing shaft.

Abstract: A fan structure includes a bearing and an impeller, wherein the bearing comprises a plurality of first lodge portions, and the impeller comprises a hub and a plurality of blades. The hub comprises a plurality of second lodge portions. The first lodge portions are cladded with the second lodge portions by means of injection molding.

Abstract: A heat-dissipation fan comprises a hollow cylinder body, a fixing pillar, a stator, a fan wheel, a bearing and bearing plate. The fixing pillar comprises a free end and a fixing end fixed at the hollow cylinder body. The stator is installed at the hollow cylinder body being installed at the bearing plate. The fan wheel comprises a top plate, an outer ring wall, an inner ring wall and a penetration hole formed at the top plate. The inner ring wall surrounds the penetration hole, the hollow cylinder body and the stator are located between the outer ring wall and the inner ring wall, and the bearing is coupled to the inner ring wall. The free end of the fixing pillar is protruded to a top surface of the top plate, which results a supporting surface and the top surface being spaced apart by a first spacing.