Patent ID: 8287420

Claim:
A multi-stage automatic transmission of a planetary design for a motor vehicle, the transmission comprising: a drive input shaft ( 1 ) and a drive output shaft ( 2 ); first, second, third and fourth planetary gearsets (P 1 , P 2 , P 3 , P 4 ) arranged in a housing (G) of the transmission, each of the first planetary gearset (P 1 ), the second planetary gearset (P 2 ), the third planetary gearset (P 3 ) and the fourth planetary gearset (P 4 ) comprising a sun gear, a carrier and a ring gear; at least third, fourth, fifth, sixth, seventh and eighth rotating shafts ( 3 , 4 , 5 , 6 , 7 , 8 ); six shift elements ( 03 , 04 , 05 , 14 , 16 , 18 ) comprising first, second and third brakes ( 05 , 04 , 03 ) and first, second and third clutches ( 18 , 16 , 14 ) in which selective engagement thereof defines different transmission gear ratios between the drive input shaft ( 1 ) and the drive output shaft ( 2 ) so that nine forward gears and one reverse gear are implemented; the sun gear of the first planetary gearset (P 1 ) is connected to the fifth shaft ( 5 ) which is connectable, via the first brake ( 05 ), to the housing (G) of the transmission; the carrier of the first planetary gearset (P 1 ) is connected to the eighth shaft ( 8 ), which is connected to the carrier of the second planetary gearset (P 2 ) and is connectable, via the first clutch ( 18 ), to the drive input shaft ( 1 ); the drive input shaft ( 1 ) is connectable, via the second clutch ( 16 ), to the sixth shaft ( 6 ) and, via the third clutch ( 14 ), to the fourth shaft ( 4 ); the sixth shaft ( 6 ) is connected to the ring gear of the third planetary gearset (P 3 ); the fourth shaft ( 4 ) is connectable, via the second brake ( 04 ), to the housing (G) of the transmission and is connected to the sun gear of the fourth planetary gearset (P 4 ) and the sun gear of the third planetary gearset (P 3 ); the ring gear of the first planetary gearset (P 1 ) is connected to the drive output shaft ( 2 ) which is connected to the ring gear of the second planetary gearset ( 2 ); the carrier of the third planetary gearset (P 3 ) is connected to the seventh shaft ( 7 ), which is connected to a component that connects the ring gear of the fourth planetary gearset (P 4 ) and the sun gear of the second planetary gearset (P 2 ) with one another; and the carrier of the fourth planetary gearset (P 4 ) is connected to the third shaft ( 3 ), which is connectable, via the third brake ( 03 ), to the housing (G) of the transmission.