Patent ID: 8708862

Claim:
A multi-stage transmission of a planetary design for a motor vehicle, the transmission comprising: a housing ( 1 ) accommodating first, second, third and fourth planetary gear sets (P 1 , P 2 , P 3 , P 4 ) and a plurality of shafts ( 2 to 9 ), first, second and third clutches (K 1 , K 2 , K 3 ) and first, second and third brakes (B 1 , B 2 , B 3 ) whose selective actuation implements various transmission ratios between a drive shaft ( 2 ) and an output shaft ( 3 ), extending coaxially with the drive shaft ( 2 ), a carrier of the first planetary gear set (P 1 ) being connected, via a third shaft ( 4 ), to a carrier of the second planetary gear set (P 2 ), the third shaft ( 4 ) is additionally connected to a ring gear of the third planetary gear set (P 3 ), a ring gear of the second planetary gear set (P 2 ) being connected to a fourth shaft ( 5 ) and being connectable to the housing ( 1 ) via actuation of the first brake (B 1 ), a fifth shaft ( 6 ) coupling a ring gear of the first planetary gear set (P 1 ) with a sun gear of the second planetary gear set (P 2 ), and the fifth shaft ( 6 ) being connectable, via the first clutch (K 1 ), to the drive shaft ( 2 ), a sun gear of the first planetary gear set (P 1 ) being fixable, via a sixth shaft ( 7 ) and the second brake (B 2 ), to the housing ( 1 ) and being connectable, via the second clutch (K 2 ), to the drive shaft ( 2 ), the first clutch (K 1 ) and the second clutch (K 2 ) being force-locking startup elements which implement a startup procedure of the transmission; and an eighth shaft ( 9 ) couples together a sun gear of the third planetary gear set (P 3 ) with a sun gear of the fourth planetary gear set (P 4 ), and the eighth shaft ( 9 ) is fixable to the housing ( 1 ) by the third brake (B 3 ).