Patent ID: 8727929

Claim:
A multi-step transmission of a planetary design for a motor vehicle, the multi-step transmission comprising: a housing ( 1 ) accommodating eight rotatable shafts, including a drive shaft ( 2 ; 20 ) and an output shaft ( 3 ; 21 ), and first, second, third and fourth planetary gear sets ( 4 , 5 , 6 , 7 ), and at least six shift elements comprising brakes ( 8 , 9 , 10 ; 8 , 9 ) and clutches ( 11 , 12 , 13 ; 11 , 12 , 22 ; 11 , 12 , 25 ; 11 , 12 , 13 , 28 ; 11 , 12 , 22 , 28 ; 11 , 12 , 25 , 28 ) and, by selective actuation of the at least six shift elements different transmission ratios are implemented between the drive shaft ( 2 ; 20 ) and the output shaft ( 3 ; 21 ), a carrier of the 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 ) being directly connectable, via of a first clutch ( 11 ), to a fourth shaft ( 15 ; 24 ), and the fourth shaft ( 15 ; 24 ) being coupled to a carrier of the second planetary gear set ( 5 ), and the third shaft ( 14 ) also being connectable, via a second clutch ( 12 ), to the drive shaft ( 2 ; 20 ), a ring gear of the third planetary gear set ( 6 ) being coupled to a fifth shaft ( 16 ) and the fifth shaft ( 16 ) is connectable, via a second brake ( 9 ), to the housing ( 1 ), the drive shaft ( 2 ; 20 ) being coupled to a sun gear of the second planetary gear set ( 5 ), and a ring gear of the second planetary gear set ( 5 ) being connected to a sixth shaft ( 17 ; 27 ), wherein the second planetary gear set ( 5 ) is a plus planetary gear set.