Fluid dynamic pressure bearing for spindle motors and storage disk drive devices and having ridge portions between grooves in the fluid dynamic pressure bearing
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United States of America Patent
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Jul 27, 2010
Grant Date -
Feb 7, 2008
app pub date -
May 13, 2005
filing date -
May 20, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
A fluid dynamic bearing having a shaft (12) and a bearing sleeve (11) rotatably supported relative to each other. At least one of the shaft and the bearing sleeve is made of steel or stainless steel made of by weight C: 0.6.about.1.20%; Si: 1.0% or less; Mn: 1.0% or less; Cr: 10.5.about.18.0%; Mo: 1.0% or less; S.: 0.03% or less; and Fe. The dynamic pressure bearing surface (20) is formed by ridges (22) remaining in between multiple dynamic pressure grooves (21) formed by electrochemical machining.
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