Bearings – Rotary bearing – Fluid bearing
Reexamination Certificate
2011-07-12
2011-07-12
Charles, Marcus (Department: 3656)
Bearings
Rotary bearing
Fluid bearing
C384S100000
Reexamination Certificate
active
07976221
ABSTRACT:
A system and method for improving lubrication in a fluid dynamic bearing are disclosed. A fluid dynamic bearing is formed. The fluid dynamic bearing comprises a shaft having an axis of rotation and a surface comprising a first groove at a first depth and a second groove at a second depth, wherein the first and second grooves are for supporting a film of lubricating fluid. The fluid dynamic bearing further includes a hub having an axis coincident to the axis of rotation and a complimentary surface juxtaposed to the shaft which is conducive to supporting the lubricating fluid such that the shaft is rotatably retained.
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Huang Fu-Ying
Tian Jifang
Charles Marcus
Hitachi Global Storage Technologies - Netherlands B.V.
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