Device for force, in particular power, transmission from an input shaft, which is connected at least indirectly to a drive unit, in particular a drive unit with a constant speed, to an output shaft, which is connected at least indirectly to a work machine, in particular a work machine with a variable speed, in particular a power transmission device having 1.2 a hydrodynamic converter comprising at least one pump wheel, one turbine wheel and one stator having blading, which form a working space that can be filled with operating medium; 1.3 a superposition gear unit comprising at least one planetary gear unit, comprising the elements annulus, sun wheel and a planet carrier with a plurality of planet wheels as elements of the planetary gear unit, wherein the pump wheel and/or the input shaft is/are coupled to a first element of the planetary gear unit, a second element of the planetary gear unit is coupled at least indirectly to the at least one turbine wheel, and the output shaft is connected to a third element of the planetary gear unit; the blading of the pump wheel and/or turbine wheel comprises at least one adjustable blade, which can be actuated by means of an actuating device, and/or at least one multi-element blade having at least one adjustable blade segment, characterized in that the first element of the planetary gear unit is formed by the planet carrier, the second element of the planetary gear unit is formed by the sun wheel and the third element of the planetary gear unit is formed by the annulus, and the turbine wheel is connected to the sun wheel by a hollow shaft, and the input shaft, which passes through the hollow shaft, is connected to the planet carrier on that side of the planetary gear unit which faces away from the hydrodynamic converter. 1.2 a hydrodynamic converter comprising at least one pump wheel, one turbine wheel and one stator having blading, which form a working space that can be filled with operating medium; 1.3 a superposition gear unit comprising at least one planetary gear unit, comprising the elements annulus, sun wheel and a planet carrier with a plurality of planet wheels as elements of the planetary gear unit, wherein the pump wheel and/or the input shaft is/are coupled to a first element of the planetary gear unit, a second element of the planetary gear unit is coupled at least indirectly to the at least one turbine wheel, and the output shaft is connected to a third element of the planetary gear unit; the blading of the pump wheel and/or turbine wheel comprises at least one adjustable blade, which can be actuated by means of an actuating device, and/or at least one multi-element blade having at least one adjustable blade segment, characterized in that the first element of the planetary gear unit is formed by the planet carrier, the second element of the planetary gear unit is formed by the sun wheel and the third element of the planetary gear unit is formed by the annulus, and the turbine wheel is connected to the sun wheel by a hollow shaft, and the input shaft, which passes through the hollow shaft, is connected to the planet carrier on that side of the planetary gear unit which faces away from the hydrodynamic converter.