Cooling fan

Details Cooling fan Cooling fan

2011-04-12

2011-04-12

Kramer, Devon C (Department: 3746)

Pumps

Motor driven

Electric or magnetic motor

C417S423100

Reexamination Certificate

active

07922465

ABSTRACT:
A cooling fan includes a fan housing (10) having a central tube (11) extending upwardly therefrom, a bearing (20) received in the central tube, a stator (40) mounted around the central tube, a rotor (30) having a shaft (37) extending into the bearing, and a magnetic ring (38) being fixedly mounted to the rotor to rotate with the rotor during operation of the cooling fan. The bearing is made of iron-copper alloy. The magnetic ring is made of hard magnetic material and exerts a magnetic attraction on the bearing, whereby the rotor is pulled downwardly by a magnetic attraction of the bearing on the magnetic ring to lessen the floating problem of the rotor during operation of the cooling fan.

REFERENCES:
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patent: 2007/0001523 (2007-01-01), Ko et al.
patent: 2007/0242911 (2007-10-01), Nakagawa et al.
Wang et al., Study on Sintering and Sintering Temperature of Oily Bearing Made of Iron Bronze, Shanghai Nonferrous Metals, Oct. 1995, 264-266, vol. 16, No. 5, published in China.

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