Thrust dynamic pressure bearing, spindle motor using the same, and information recording and reproducing apparatus using them
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United States of America Patent
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Jan 9, 2007
Grant Date -
Jun 30, 2005
app pub date -
Nov 18, 2004
filing date -
Nov 20, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In order to prevent lubricating oil leakage due to bubbles in a thrust dynamic pressure bearing having herringbone grooves, and to stabilize the bearing performance, and enhance the reliability and durability, auxiliary grooves deeper than pump-in type herringbone grooves for generating dynamic pressure are provided. The bearing inner periphery and bearing outer periphery are linked by a pressure gradient descending slowly, and therefore bubbles present in the bearing inner periphery can be guided to the bearing outer periphery through the auxiliary grooves, and discharged outside of the bearing from the air-liquid interface, so that lubricating oil leakage due to bubbles can be prevented.
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