Clamping device in main shaft driving device for machine tool
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United States of America Patent
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Mar 19, 2013
Grant Date -
Aug 30, 2012
app pub date -
May 1, 2012
filing date -
Nov 19, 2008
priority date (Note) -
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Abstract
A clamping device in a main shaft driving device for a machine tool, which rotationally drives a main shaft, wherein the main shaft is rotatably supported by a frame. The clamping device includes a clamp piston, a pressure chamber and an operating fluid supplying mechanism, wherein the clamp piston has a first pressure-receiving surface and a second pressure-receiving surface, the first pressure-receiving surface receiving the spring force of a spring member, the second pressure-receiving surface receiving pressure of an operating fluid, wherein the operating fluid supplying mechanism includes a switching portion that selectively supplies the corresponding operating fluid from a common operating fluid supply source to at least one of a first pressure chamber and a second pressure chamber.
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