Rotational resistance applying device in main shaft driving device for machine tool
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United States of America Patent
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Apr 26, 2011
Grant Date -
Oct 14, 2010
app pub date -
Mar 24, 2010
filing date -
Apr 14, 2009
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A rotational resistance applying device in which a hollow roller is provided between a first surface of a clamp piston (pressing member) and a second surface of a sliding disc (a press member), and in which a pressing force applied to the clamp piston acts upon the sliding disc through the hollow roller that press-contacts the first and second surfaces by displacement of the clamp piston. By this, rolling resistance of the hollow roller resiliently deformed by the pressing force causes a rotational resistance to be applied to a main shaft within a range allowing rotation. This makes it possible to prevent pulsation from being generated in the rotation of the main shaft. In addition, even if the pressing force is applied to the clamp piston, the hollow roller rolls, so that wear of the clamp piston and wear of the sliding disc can be restricted.
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