ROTOR SHAFT AND COOLING FAN USING SAME
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United States of America Patent
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Issued Date -
Jun 13, 2013
app pub date -
Dec 7, 2011
filing date -
Dec 7, 2011
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A rotor shaft includes a main body having a central portion and an extension portion. The extension portion has a plurality of extension sections radially outward extended from the central portion by different distances to together define a peripheral surface and a non-circular cross section of the main body. In a cooling fan using the rotor shaft, the main body of the rotor shaft is received in a shaft space internally defined by a bearing of the fan, and a lubricant is filled in a space left between the main body and the shaft space. With the non-circular cross section of the main body of the rotor shaft, the lubricant filled between the rotor shaft and the shaft space can have increased support pressure to thereby reduce the noise and vibration caused by frictional contact of the rotor shaft with the bearing during the operation of the cooling fan.
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