Patent ID: 8727931

Claim:
A gear train unit comprising: a plurality of planetary gear train stages, which are connected one after the other and which each comprise a ring gear ( 4 , 4 a , 4 b ), a sun gear ( 2 a , 21 , 21 a ) and a plurality of planet gears ( 3 , 3 a , 3 b ) supported on a planet gear carrier ( 5 , 5 a , 6 ), wherein the sun gear ( 2 a , 21 , 21 a ) of each following planetary gear train stage is formed by the planet gear carrier ( 5 , 5 a ) of the preceding planetary gear train stage or, in a torsionally rigid manner in rotational direction of this planet gear carrier ( 5 , 5 a ), is connected or connectable to this planet gear carrier, a drive element ( 2 ), which forms the sun gear ( 2 a ) of the first planetary gear train stage or, in a torsionally rigid manner in rotational direction of this sun gear ( 2 a ), is connected or connectable to this sun gear, and an output element ( 17 ), which forms the planet gear carrier ( 6 ) of the last of the planetary gear train stages which are connected one after the other or, in a torsionally rigid manner in rotational direction of this planet gear carrier ( 6 ), is connected or connectable to same, wherein the gear train unit can be shifted in such a way that either a first or a second gear ratio can be set, wherein at least some of the planet gear carriers ( 5 a , 5 b , 6 ) of the planetary gear train stages, in particular by means of roller bearings ( 19 , 20 ), are supported on the drive element ( 2 ), wherein the section of the drive element ( 2 ), on which the planet gear carriers ( 5 a , 5 b , 6 ) are supported, in the intended operation transmits the torque for driving the sun gear ( 2 a ) of the first planetary gear train stage, wherein the drive element ( 2 ) is adapted for being connected to a drive motor, wherein the output element ( 17 ) is adapted for being connected to a work machine, and wherein the gear train unit is integrated into a housing ( 17 ), which at the same time forms the output element ( 17 ) and at its outer circumference comprises a running surface for a V-belt or a flat belt, or gear teeth ( 18 ) for a toothed belt, a chain or a gearwheel, for connection to a respective drive element of a work machine.