Transmission shaft for a planetary transmission

A gearbox shaft, in particular a sun shaft, for a planetary gearbox, the gearbox shaft comprising:

• a first coupling point, in particular toothing, for introducing a torque;
• a first shaft region designed to transmit the torque along an axial torque flow;
• a second shaft region designed to transmit the torque along an axial torque flow counter to the first shaft region;
• a disk region designed to transmit the torque between the first shaft region and the second shaft region along a radial torque flow;
• and
• a second coupling point designed to discharge the torque, in particular to a rotor shaft of a generator,
• wherein a path of a torque flow extending from the first coupling point to the second coupling point is formed,
• wherein a sum of axial components of the path along which the torque flow flows is greater than an axial spacing between the first coupling point and the second coupling point,
• wherein the first shaft region and the second shaft region, when viewed in an axial direction, overlap in a common axial sub-region,
• wherein a freely oscillating shaft end is formed in the common axial sub-region in which the torque flow flows at different radil in opposite axial directions, and
• wherein the disk region defines an axial end portion that is part of the freely oscillating shaft end.