more planet gears 17 a further planet gear 19 which meshes with the sun gear 8 is in each case arranged in an axially offset manner on the shafts rotatably mounted in the housing 16 of the planet gears 17 from the sun gear 8 which is centered in a floating position between a plurality of planet gears the force is directed via the bored out sun gear shaft 4 by a coupling 6 preferably a toothed coupling to a hub 24 in the interior of which the sun gear shaft 4 is accommodated without additional outlay in terms of design the epicyclic gearing stages 18 17 19 8 can be made with helical tooth systems in which case the axial forces of the planet gears 17 19 are compensated and the advantages of helical tooth systems such as smoother running properties or higher load carrying capacity can be utilized drive fluctuations which are due to irregular wind conditions or other effects are alleviated or compensated for by an elastic axial fastening of the sun gear shaft furthermore it is possible to obtain information about the current operating data of the installation such as torque power output etc by measuring the axial forces which occur if these data are known appropriately controlled intervention in the.