Patent ID: 8721492

Claim:
A multi-stage gearbox of a planetary construction comprising: a housing ( 1 ) accommodating first, second, third and fourth planetary sets ( 4 , 5 , 6 , 7 ), a plurality of shafts, and a plurality of shift elements comprising at least a brake and clutches and which can establish, by targeted activation, different gear ratios between a drive shaft ( 2 ) and an output shaft ( 3 ; 20 ; 28 ; 35 ; 41 ; 44 ; 45 ; 47 ; 48 ), the drive shaft ( 2 ) being connected to a carrier of the second planetary set ( 5 ), a sun gear of the second planetary set ( 5 ) being coupled with a third shaft ( 14 ; 31 ; 32 ; 36 ; 49 ) and a ring gear of the second planetary set ( 5 ) being coupled with a fourth shaft ( 15 ; 23 ; 24 ), the fourth shaft ( 23 ) being connected with a sun gear of the fourth planetary set ( 7 ), the output shaft ( 3 ; 20 ; 28 ; 35 ; 41 ; 44 ; 45 ; 47 ; 48 ) being connected with a carrier of the fourth planetary set ( 7 ), a fifth shaft ( 16 ; 27 ; 40 ; 46 ; 52 ) being connectable, via engagement of a first brake ( 8 ), with the housing ( 1 ), the output shaft ( 3 ; 28 ; 35 ; 41 ) being connectable, via engagement of a first clutch ( 10 ), with the fourth shaft ( 15 ) connected with the sun gear of the fourth planetary set ( 7 ), a ring gear of the fourth planetary set ( 7 ) one of: being coupled with a sixth shaft ( 17 ) which is connectable, via engagement of a second clutch ( 11 ), with the fifth shaft ( 16 ; 40 ; 52 ) or being connected to the sixth shaft ( 22 ) which is connectable, via engagement of a first clutch ( 21 ), with the output shaft ( 20 ; 44 ; 45 ; 47 ; 48 ) and is connectable, via engagement of a second clutch ( 11 ), with the fifth shaft ( 16 ; 40 ).