1. A hydrostatic-mechanical transmission with input split power, comprising two three-shaft planetary gear sets I and II, in which one difference shaft (annulus 2') of the planetary gear set I forms a unit, and, together with the sum shaft (cage s') of the planetary gear set II, forms the drive shaft, in which the second difference shaft (sun wheel 1') of the planetary gear set I is coupled with one difference shaft (sun wheel 1') of the planetary gear set II and is connected via a hydrostatic transmission (b) with the drive shaft (1), and in which the sum shaft (cage s) of the planetary gear set I on the one hand and the second difference shaft (annulus 2') of the planetary gear set II on the other hand can act alternately, by way of output coupling stages, upon the driven shaft (2), so that several unstepped gearchange ranges in series (1 to 4 and R) form the total gearchange ratio range, with the output coupling stages exhibiting at any given instant the same transmission ratio for two adjacent gearchange ranges, beginning with gearchange range 1 which follows the starting range, with the output coupling stages for the odd-number gearchange ranges (1 and 3) being coupled to the sum shaft (cage s) of the planetary gear set I and the output coupling stages for the even-number gearchange ranges (2 and 4) being coupled to the difference shaft (annulus 2') of the planetary gear set II, and with the output coupling stages being adjusted in their ratios in such a way that changes of gearchange range take place synchronously without load and without interruption of tractive power, characterised by the combination of the following features, known in themselves : a. that for starting a friction clutch (K) is provided between the motor and the drive shaft b. that the output coupling stages consist of spurgear stages c. that the output coupling stages are connected to jaw clutch couplings.
HYDROSTATIC-MECHANICAL TRANSMISSION WITH INPUT SPLIT POWER