Patent ID: 8663053

Claim:
A multi-step transmission, of a planetary design, comprising: a housing accommodating shafts, first, second, third and fourth planetary gear sets ( 4 , 5 , 6 , 7 ), and at least six shift elements comprising at least one brake ( 8 , 9 , 10 ; 8 , 9 ; 8 , 29 ; 8 ) and clutches ( 11 , 12 , 13 ; 11 , 12 , 13 , 21 ; 11 , 12 , 13 , 24 ; 11 , 12 , 13 , 27 ; 11 , 12 , 13 , 27 , 30 ; 11 , 12 , 13 , 27 , 31 ), and selective engagement of the at least six shift elements implements different transmission ratios between a drive shaft ( 2 ) and an output shaft ( 3 ; 20 ), a carrier of a first planetary gear set ( 4 ) being connected to a third shaft ( 14 ) and the third shaft ( 14 ) is connectable, via a first brake ( 8 ), to the housing ( 1 ) and the third shaft ( 14 ) also being connectable, via a first clutch ( 11 ), to a fourth shaft ( 15 ; 23 ) and the fourth shaft ( 15 ; 23 ) being coupled to a ring gear of a third planetary gear set ( 6 ), a fifth shaft ( 16 ) connecting a ring gear of a second planetary gear set ( 5 ) to a sun gear of the third planetary gear set ( 6 ) and the fifth shaft ( 16 ) being connectable, via a second clutch ( 12 ), to the output shaft ( 3 ; 20 ), a sixth shaft ( 17 ; 26 ) being connected to a ring gear of the first planetary gear set ( 4 ), and the drive shaft ( 2 ) being connectable, via a third clutch ( 13 ), to the third shaft ( 14 ), and the drive shaft ( 2 ) being coupled to a carrier of the second planetary gear set ( 5 ).