variable reduction with varying torque overload conditions the translation of the two stages of the in fig1 shown planetary gearing can for this for example be so selected that the fundamental conversion of the first stage is 6 1 and the fundamental conversion of the second stage is 4 8 1 for adaptation of the accu screwdriver to various loads it is provided with a torque limitation device in the form of an overload coupling this is comprised in the embodiment shown in fig1 of a cylinder like annular gear 3 a metallic cam disk 5 a metallic pressure element 6 as well as a pressure spring 18 constructed as a spiral spring the annular gear 3 which is comprised of plastic for example of polyamide 6 6 with mineral fillers is seated inside the gear housing 4 and is provided with an stepped internal gearing so that the planetary gears 8 of the first stage and the planetary gears 9 of the second stage of the planetary gearing are in engagement with the corresponding respective inner teething of the annular gear 3 the annular gear 3 is through axial pressure of the pressure spring 18 transmitted through the pressure element 6 and.