Cooling fan with balance structure

Details Cooling fan with balance structure Cooling fan with balance structure

2011-04-12

2011-04-12

Look, Edward (Department: 3745)

Rotary kinetic fluid motors or pumps

Bearing, seal, or liner between shaft or shaft sleeve and...

C416S174000

Reexamination Certificate

active

07922446

ABSTRACT:
A cooling fan includes a fan housing (30) having a central tube (34) extending upwardly therefrom; the central tube has a bottom, annular protrusion (31). A bearing (61) is received in the central tube and mounted on the protrusion. A stator (20) is mounted around the central tube. A rotor (10) includes a shaft (18) having a free end (186) extending through the bearing and defining a notch (184) therein. A locking washer (63) engages into the notch of the shaft to limit movement of the shaft along an axial direction thereof. A balance structure (62) is arranged between the locking washer and the bearing. The balance structure is made of magnet and exerts a downwardly pulling force on the shaft to prevent the rotor from moving upwardly when the rotor is rotated.

REFERENCES:
patent: RE35718 (1998-01-01), Nii et al.
patent: 6921996 (2005-07-01), Parsoneault et al.
patent: 7145275 (2006-12-01), Yang et al.
patent: 2005/0157963 (2005-07-01), Oelsch
patent: 2006/0255674 (2006-11-01), Chen et al.
patent: 2007/0024137 (2007-02-01), Otsuki et al.
patent: 2008/0238228 (2008-10-01), Chang et al.
patent: M296587 (2006-08-01), None

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