Patent ID: 7391140
Filing Date: 2008-06-24
Classification: F04D,F16C,H02K

Abstract:
1. A heat-dissipating fan comprising: a casing comprising a base and a plurality of ribs for supporting the base, the base including an axial tube at a center thereof, a bearing being mounted in the axial tube; a stator mounted on the base; and an impeller comprising a plurality of vanes on an outer circumferential wall thereof, the impeller further comprising an axial seat at a center thereof, a shaft including a first end fixed to the axial seat and a second end, the shaft extending through the bearing, a magnetic member being mounted to the second end of the shaft, the magnetic member and the impeller rotating synchronously under magnetic induction, wherein the second end of the shaft includes a first annular groove and a second annular groove that is adjacent to the second end of the shaft, further comprising a first retaining member mounted in the first annular groove and a second retaining member mounted in the second annular groove, the shaft further includes a flat surface in a section of an outer circumference of the shaft adjacent to the second angular groove to provide a non-circular section on the shaft, the magnetic member includes a central axial hole through which the shaft extends, and the central axial hole of the magnetic member includes a flat section for engaging with the flat surface of the shaft.