Low profile hydrodynamic motor having minimum leakage properties
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United States of America Patent
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Oct 10, 1995
Grant Date -
N/A
app pub date -
Sep 15, 1993
filing date -
Sep 22, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A spindle motor comprises a rotary sleeve; a rotor hub which is integrally rotated with the rotary sleeve; a stationary sleeve; and a stationary support extending upwardly from the stationary part, the rotary sleeve being fitted onto the outer peripheral surface of the stationary support, and radial and thrust hydrodynamic bearings being provided on the relative sliding surfaces of both rotary sleeve and stationary support. A pair of annular grooves which partially overlap each other in the axial direction are peripherally provided on the rotary sleeve and stationary support, thereby providing a labyrinth chamber to suppress the outflow of the lubricant.
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