Multistage gear assembly for power transmission between an input shaft and two output shafts (26, 27), in which at least two gear stages designed as epicyclic gears and a gear stage designed as a belt drive are arranged in series in the power or output flow and the epicyclic gears and/or belt drive each have a fixed, non-switchable transmission ratio, wherein one of the epicyclic gears is designed as a differential or power-splitting gear for the output shafts (26, 27) and the gear stages are arranged within a common transmission housing, wherein the epicyclic gears are designed as toothed gears and the belt drive is designed as a simple one-stage step-up gear made of a respective drive and output pulley connected via belts, - characterized in that - the belt drive and one of the epicyclic gears are designed as step-up gears with a step-up transmission ratio of i ≥ 1, and - on the drive side, i.e. starting from the drive or the input shaft, firstly a first epicyclic gear having a first planet carrier or web for receiving and mounting first externally toothed planet gears is provided, - wherein the first planet gears mesh with the first externally toothed sun gear arranged concentrically with the first planet carrier and co-rotationally connected to the input shaft and an internally toothed internal gear arranged concentrically with the first planet carrier, - wherein the internal gear is rotatably mounted and designed as a drive pulley of a belt drive, in which the belt firstly wraps partially circumferentially around the internal gear and secondly with a frictional and/or form fit on the outside of an output pulley for transmitting a torque and a rotational speed, - wherein the output pulley and a second planet carrier of a second epicyclic gear designed as a differential or power-splitting gear are designed such that a rotation of the output pulley of the belt drive can be transmitted to the second planet carrier of the second epicyclic gear, - wherein the second epicyclic gear has two, preferably bevel-toothed differential sun gears (35, 36) which are each co-rotationally connected to an output shaft (26, 27) and which mesh with now second planet gears (37, 38) that are mounted in the second planet carrier such that the output shafts (26, 27) can be rotated with the same or different rotational speed or direction of rotation. - characterized in that - the belt drive and one of the epicyclic gears are designed as step-up gears with a step-up transmission ratio of i ≥ 1, and - on the drive side, i.e. starting from the drive or the input shaft, firstly a first epicyclic gear having a first planet carrier or web for receiving and mounting first externally toothed planet gears is provided, - wherein the first planet gears mesh with the first externally toothed sun gear arranged concentrically with the first planet carrier and co-rotationally connected to the input shaft and an internally toothed internal gear arranged concentrically with the first planet carrier, - wherein the internal gear is rotatably mounted and designed as a drive pulley of a belt drive, in which the belt firstly wraps partially circumferentially around the internal gear and secondly with a frictional and/or form fit on the outside of an output pulley for transmitting a torque and a rotational speed, - wherein the output pulley and a second planet carrier of a second epicyclic gear designed as a differential or power-splitting gear are designed such that a rotation of the output pulley of the belt drive can be transmitted to the second planet carrier of the second epicyclic gear, - wherein the second epicyclic gear has two, preferably bevel-toothed differential sun gears (35, 36) which are each co-rotationally connected to an output shaft (26, 27) and which mesh with now second planet gears (37, 38) that are mounted in the second planet carrier such that the output shafts (26, 27) can be rotated with the same or different rotational speed or direction of rotation.