Patent ID: 7014587

Claim:
An automatic powershift gearbox comprising: at least one gear assembly for selecting a desired gear ratio; at least one multiple-disk clutch capable of being actuated in a controlled manner for holding or releasing individual elements of the at least one gear assembly, which allows gear shift operations without interrupting the torque flow, with the multiple-disk clutch comprising a first and a second disk set which are in mutual engagement and can be brought into friction engagement by axial compression against one another, with the first disk set being connected with a first shaft, and the second disk set being connected with a second shaft and the multiple-disk clutch being coupled by a transmission with an electric machine comprising a rotor and a stator, for bringing the two disk sets into and out of friction engagement by means of the electric machine, wherein the rotor of the electric machine is supported rotatably and axially movable on one of the shafts by means of a transmission device for converting a rotary motion into a thrust motion, the transmission device comprising: a spindle/nut arrangement, one part of which is substantially rigidly connected with one of the shafts, and the other part of which is substantially rigidly connected with the rotor; and said one part of the spindle/nut arrangement has an engaged end position and a disengaged end position with one locking location each, and the other part of the spindle/nut arrangement has locking elements which are adapted to lock in the locking locations.