Steering drive system for a vehicle with wheel-based steering, vehicle with wheel-based steering and method for the operation thereof

A steering drive system for a wheel side steered vehicle, the steering drive system comprising:

• a coupling element configured to be coupled to output drives of the vehicle, which output drives are driven at a basic rotational speed by a traction drive system of the vehicle, such that, when an amount of a superposition rotational speed of the coupling element is greater than zero, the coupling element provides at the output drives a superposition rotational speed that is superposed on the basic rotational speed to thereby steer the vehicle;
• at least one first electric machine having a rotational speed that is variably controllable;
• a power summation and/or power branching unit;
• a first connection of the power summation and/or power branching unit is coupled to a first shaft that is configured to be coupled to a shaft of the traction drive system;
• a second connection of the power summation and/or power branching unit is coupled to the at least one first electric machine;
• a third connection of the power summation and/or power branching unit is coupled to the coupling element;
• and at least one of:
• a reversing gear configured to reverse a direction of rotation of the coupling element, wherein the reversing gear is arranged after a superposition of the power provided by the first shaft with the power provided by the at least one first electric machine, or
• a power unit connected in parallel with the power summation and/or power branching unit, and configured to couple the first shaft in parallel with the power summation and/or power branching unit to the coupling element.