Spindle device for machine tool
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United States of America Patent
Stats
-
Feb 26, 2013
Grant Date -
May 28, 2009
app pub date -
Nov 4, 2008
filing date -
Nov 22, 2007
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A machine-tool spindle device includes: a spindle; a front housing for rotatably supporting the spindle; a first drive motor having a first rotor installed securely on the spindle and a first stator installed securely within the front housing; a rear housing installed on a rear end side of the spindle in the front housing; a second drive motor having an annular second rotor which is disposed coaxially to the spindle near a rear end of the spindle and which is supported rotatably within the rear housing, and a second stator installed securely within the rear housing; a connecting mechanism for connecting the rear end of the spindle and the second rotor and releasing the connection; and a clamping mechanism, disposed within the attaching hole of the spindle and within the second rotor, for clamping a tool attached to the spindle.
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