Motor with aerodynamic pressure bearing mechanism
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United States of America Patent
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May 28, 2013
Grant Date -
Jul 1, 2010
app pub date -
May 21, 2008
filing date -
May 25, 2007
priority date (Note) -
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Abstract
In a gas dynamic pressure bearing mechanism (1) for smoothing rotary motion of a shaft (10) by feeding gas to the bearing clearance between the shaft (10) and a fixed sleeve (20) for supporting the shaft (10) through a herring bone groove (10a), the herring bone groove (10a) is provided in the shaft (10) such that pressure distribution generated in the bearing clearance moves at a high speed. The herring bone groove (10a) consists of N grooves such that N minimal pressure values appearing alternately with maximal pressure values at the positions where the maximal pressure values of dynamic pressure variation appear in the bearing clearance when the shaft (10) rotates have such an interval as it becomes lower than the condensation pressure value.
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