Spindle motor with an aerodynamic and hydrodynamic bearing assembly
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United States of America Patent
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Jan 6, 2004
Grant Date -
Feb 6, 2003
app pub date -
Apr 25, 2000
filing date -
Dec 23, 1999
priority date (Note) -
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Abstract
A spindle motor (10) including a stator component (16), a rotor component (18), including a hub (14) for supporting one or more discs, and a bearing assembly between tHe components, formed of a journal bearing (54) and a thrust bearing (52), wherein the journal bearing (54) is an aerodynamic bearing and the thrust bearing is adapted to function in a bi-directional manner and includes an annular member (30) projecting radially from one of the components into an associated recess (76) formed in the other of the components. Preferably, the annular member has two opposed bearing faces (68,70) arranged adjacent corresponding bearing surfaces of the recess, and a hydrodynamic bearing is formed between the respective bearing faces and surfaces.
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