FLUID DYNAMIC PRESSURE BEARING OIL, FLUID DYNAMIC PRESSURE BEARING USING THE SAME, AND SPINDLE MOTOR
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United States of America Patent
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Oct 23, 2014
app pub date -
Mar 28, 2014
filing date -
Mar 28, 2013
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It is provided a long life spindle motor that is excellent in startup characteristic in low-temperature environments such as 0° C., and that startup problems due to the evaporation or deterioration of lubricating oil can be avoided in high-temperature environments. The spindle motor includes a fluid dynamic bearing filled with a lubricating oil, containing a methyl pentanediol diester obtained by esterifying 3-methyl-1,5-pentanediol with n-decanoic acid and n-undecanoic acid at a molar ratio ranging from 90:10 to 20:80, and having a water content of not more than 1000 ppm.
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