Hydrodynamic bearing device
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United States of America Patent
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May 10, 2005
Grant Date -
Oct 2, 2003
app pub date -
Jul 10, 2001
filing date -
Jul 10, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
A bearing has a thrust plate integrated with its shaft and a bearing member surrounds both. A radial pressure bearing portion and separate thrust portion generate pressure on a lubricating fluid in a gap between the shaft and bearing member. One end of the gap is closed while the other is open and has a capillary seal formed with an angle that is large at a boundary but smaller at increasing distance therefrom. The fluids fills the gap so that gas-fluid interface is where the angle is small and causes the thrust plate to float. A pressure mechanism forces the fluid from the open to the closed end and the quantity of fluid is set to fill the mechanism even if the gas-fluid interface moves.
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