Patent attributes
A motor spindle for machine tool. The motor spindle having a spindle housing mounted on a machine part, a work spindle supported in the spindle housing in axially spaced roller bearings, an electric drive motor the stator of which is fixed in the spindle housing and the rotor of which is fixed to the work spindle, a clamping unit for a tool disposed in the work spindle and operable by a hydraulic ring cylinder against the force of a spring unit, and an internal coolant supply for the tool integrated in the clamping unit and comprising a rotational feedthrough for the coolant provided within the hydraulic ring cylinder For a technically simple and low-cost implementation of maintenance and repair services on the motor spindle the work spindle as well as the rotor, the clamping unit and the bearing arrangements are formed as a modular assembly mountable in the spindle housing carrying the stator from the front side, the ring cylinder for releasing the clamping unit and the rotational feedthrough being disposed in an end portion of the spindle housing.
