Patent ID: 7273438

Claim:
A multi-speed transmission of a planetary construction for an automatic transmission for a motor vehicle, the transmission comprising: an input shaft ( 1 ) and an output shaft ( 2 ) which are arranged in a housing (G), first, second and third planetary gear sets (P 1 , P 2 , P 3 ), at least seven rotatable shafts ( 1 , 2 , 3 , 4 , 5 , 6 , 7 ) as well as at least six shifting elements ( 03 , 04 , 05 , 15 , 35 , 36 ) comprising a first brake ( 03 ), a second brake ( 04 ) and a third brake ( 05 ) and a first clutch ( 15 ), a second clutch ( 35 ) and a third clutch ( 36 ) whose selective engagement results in various gear ratios between the input shaft ( 1 ) and the output shaft ( 2 ) so that seven forward gears and one reverse gear can be implemented, the input shaft ( 1 ) is permanently connected to a sun gear of the second planetary gear set (P 2 ) and can be connected, via the first clutch ( 15 ), to a fifth shaft ( 5 ) which is connected to a spider of the third planetary gear set (P 3 ), the fifth shaft ( 5 ) can be coupled, via the third brake ( 05 ), to the housing (G) and can be detachably connected, via the second clutch ( 35 ), to a third shaft ( 3 ), the third shaft ( 3 ) can be detachably connected, via the third clutch ( 36 ), to a sixth shaft ( 6 ), the third shaft ( 3 ) can be coupled, via the first brake ( 03 ), to the housing (G) and is permanently connected to a spider of the first planetary gear set (P 1 ), the sixth shaft ( 6 ) is permanently connected to an internal gear of the second planetary gear set (P 2 ) and a sun gear of the third planetary gear set (P 3 ), and a seventh shaft ( 7 ) is permanently connected to a planet carrier of the second planetary gear set (P 2 ) and an internal gear of the first planetary gear set (P 1 ), a fourth shaft ( 4 ) is permanently connected to a sun gear of the first planetary gear set (P 1 ) and can be coupled, via the second brake ( 04 ), to the housing (G), and the output shaft ( 2 ) is permanently connected to an internal gear of the third planetary gear set (P 3 ).