Spindle unit
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United States of America Patent
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Apr 21, 2015
Grant Date -
Dec 19, 2013
app pub date -
Jun 11, 2013
filing date -
Jun 19, 2012
priority date (Note) -
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Abstract
A spindle unit includes: a main spindle that holds a rotary tool, and that is rotated; bearings by which the main spindle is rotatably supported; and a damper bearing by which the main spindle is rotatably supported, and that has a damping coefficient larger than damping coefficients of the bearings. The damping coefficient of the damper bearing is set to a value within a range from 10,000 to 1,000,000 N·s/m.
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