ACTUATING DEVICE FOR A TOOL OR WORKPIECE TENSIONING JACK IN A MACHINE TOOL SPINDLE

摘要

The invention relates to an actuating device for a tool or a workpiece tensioning jack in a machine tool spindle. The actuating device includes a pressure piston which is arranged inside a housing for actuating the tool or workpiece tensioning jack. In order to provide a compact, space-saving actuating device enabling leakage fluid to be drained off in a simple manner, several interspaced continuous bores are arranged concentrically around a center axis in a side wall of the housing. Pressure plungers which are axially displaceable with the aid of the pressure piston are disposed therein and the housing contains at least one leakage channel with a section extending between the pressure plungers in a radially outer direction.