Clamping unit

A clamping unit for machine tools, the clamping unit comprising a housing adapted to be connected to a machine spindle in a rotationally fixed arrangement, and a screw drive arranged in the housing, wherein the screw drive interacts with a draw rod linked to a power chuck, by means of which rotational movements transmitted to the clamping unit are converted into translational adjustment movements of the draw rod;

• wherein, the housing is provided with an output element connected to the housing, with rotational movements of a machine spindle being transmitted via the output element onto an actuator disposed adjacent the clamping unit, and the housing is provided with an input element mounted, in a rotating arrangement on the housing, with the actuator acting on the input element, the input element being disposed in a driving connection with a rotating but axially fixed hollow shaft by intermediate element means, wherein the hollow shaft is supported on the housing and interacts with the screw drive;
• and
• wherein the housing is provided with a selected one of a flat and stepped contact surface on a side thereof facing away from the power chuck and adapted to receive a stop shaft insertable into a central hole in the housing.

A clamping unit for machine tools, the clamping unit comprising a housing adapted to be connected to a machine spindle in a rotationally fixed arrangement, and a screw drive arranged in the housing, wherein the screw drive interacts with a draw rod linked to a power chuck, by means of which rotational movements transmitted to the clamping unit are converted into translational adjustment movements of the draw rod;

• wherein, the housing is provided with an output element connected to the housing, with rotational movements of a machine spindle being transmitted via the output element onto an actuator disposed adjacent the clamping unit, and the housing is provided with an input element mounted, in a rotating arrangement on the housing, with the actuator acting on the input element, the input element being disposed in a driving connection with a rotating but axially fixed hollow shaft by intermediate element means, wherein the hollow shaft is supported on the housing and interacts with the screw drive;
• and
• wherein a selected one of the clamping unit and the actuator assigned to the clamping unit is provided with a securing device, by means of which the intermediate elements of the clamping unit and the actuator are adapted to be blocked in the event of disruptions in operation.