Brushless fan
AssigneeTranyoung Technology Corp.
InventorChin Yi Hu
Life of this patent
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Abstract
A brushless fan comprises a rotor assembly, a stator assembly, a frame, a retaining ring, and an oil ring. Concentric inner and outer slopes are provided at bottom of shaft housing for supporting bearing and stator assembly. As such, bearing and stator assembly precisely position with respect to shaft housing for obtaining an optimum magnetization, whereby shaft can stably rotate under the influence of magnetic field of rotor. Lubricating oil reservoir is provided between bearing and the top of shaft housing. Oil ring and projected cylindrical member are provided on top of shaft housing being oblique with respect to each other and separated by a minimum gap, thereby sealing the oil reservoir. With this, lubricating oil is prevented from spilling when rotor is rotating. Further a larger oil storage space and the omission of washer are effected.
Claims14
A brushless fan comprising:
- a rotor assembly including a cylindrical housing with an open bottom, a plurality of blades equally provided along the circumferential outer surface of the cylindrical housing, a central shaft secured to the top of the cylindrical housing having an annular groove at the bottom end, and a magnet frame fixed to the circumferential inner surface of the cylindrical housing;
- a stator assembly;
- and
- a frame including a space for receiving the rotor assembly, a central base, a tubelike shaft housing, and a bearing fitted in the shaft housing for receiving the shaft therethrough;
- wherein a first supporting member and a second supporting member are provided at the interior and the exterior abutted the bottom of the shaft housing for supporting the bearing and the stator assembly respectively such that the bearing and the stator assembly precisely position with respect to the shaft housing for obtaining an optimum magnetization, whereby the shaft can stably rotate under the influence of the magnetic field of the rotor assembly.
Dependencies are inferred from the claim text.