Patent ID: 7958805

Claim:
A device for exteriorly threading a rod-shaped workpiece in a machine tool, comprising: an annular hollow sleeve extending along a longitudinal axis and formed with a plurality of circumferential channels; a support for supporting the annular sleeve, the support having an inlet for admitting a cooling lubricating fluid into the channels, and an outlet for discharging the cooling lubricating fluid from the channels; an electric motor built into the support for rotating a thread-cutting tool about the longitudinal axis to exteriorly thread the workpiece, the motor having a stator supported and surrounded by the annular sleeve and cooled by the cooling lubricating fluid in the channels during rotation of the thread-cutting tool, and a rotor surrounded by the stator; and a tool holder for holding the thread-cutting tool concentric with the longitudinal axis, the tool holder being coupled to the rotor for joint rotation about the longitudinal axis.