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.

Abstract: A lubricated bushing is mounted in a mounting cavity in a bushing housing and has a body and a flange. The body has an axial hole formed coaxially through the body to rotatably hold a shaft of a rotor of a fan and a bottom concentric recess formed in a bottom end of the body. The flange is formed on and protrudes radially out from the outer wall of the body, is mounted against an inner wall of the mounting recess, extends longitudinally from the top end of body and is shorter than half the body. Even though the inner wall of the mounting cavity tightly compresses the flange, the compressive force cannot be effectively transmitted to the body to deform the axial hole, so the shaft is kept from seizing up in the axial hole.

Abstract: A lubricated bushing is mounted in a mounting cavity in a bushing housing and has a body and a flange. The body has an axial hole formed coaxially through the body to rotatably hold a shaft of a rotor of a fan and a bottom concentric recess formed in a bottom end of the body. The flange is formed on and protrudes radially out from the outer wall of the body, is mounted against an inner wall of the mounting recess, extends longitudinally from the top end of body and is shorter than half the body. Even though the inner wall of the mounting cavity tightly compresses the flange, the compressive force cannot be effectively transmitted to the body to deform the axial hole, so the shaft is kept from seizing up in the axial hole.