Patent ID: 8062164

Claim:
A multi-speed automatic transmission of a planetary design for a motor vehicle, the transmission comprising: an input element (An) and an output element (Ab); first, second and third planetary gear sets (P 1 , P 2 , P 3 ) and each of the first, the second and the third planetary gear sets (P 1 , P 2 , P 3 ) comprising a sun gear, a carrier and a ring gear; at least first, second, third, fourth, fifth and sixth rotatable shafts ( 1 , 2 , 3 , 4 , 5 , 6 ), as well as at least six shifting elements ( 03 , 04 , 13 , 14 , 15 , 35 , 36 , 46 ) comprising first and second brakes ( 03 , 04 ) and first, second, third and fourth clutches ( 13 , 14 , 15 , 35 , 36 , 46 ) whose selective engagement forms different gear ratios between the input element (An) and the output element (Ab) such that at least six forward gears and three reverse gears can be implemented; the first shaft ( 1 ) being coupled to the input element (An) and the sun gear of the second planetary gear set (P 2 ); the second shaft ( 2 ) being coupled to the output element (Ab) and the ring gear of the third planetary gear set (P 3 ); the third shaft ( 3 ) being coupled to the ring gear of the second planetary gear set (P 2 ); the fourth shaft ( 4 ) being coupled to the carrier of the third planetary gear set (P 3 ); the fifth shaft ( 5 ) being coupled to the ring gear of the first planetary gear set (P 1 ), the carrier of the second planetary gear set (P 2 ) and the sun gear of the third planetary gear set (P 3 ); the sixth shaft ( 6 ) being coupled to the carrier of the first planetary gear set (P 1 ); the sun gear of the first planetary gear set (P 1 ) being non-rotatably coupled to a transmission housing (G); the third shaft ( 3 ) being non-rotatably coupled, via the first brake ( 03 ), to the transmission housing (G); the fourth shaft ( 4 ) being non-rotatably coupled, via the second brake ( 04 ), to the transmission housing (g); the first clutch ( 14 ) detachably coupling the first shaft ( 1 ) to the fourth shaft ( 4 ); the second clutch ( 36 ) detachably coupling the third shaft ( 3 ) to the sixth shaft ( 6 ); the third clutch ( 46 ) detachably coupling the fourth shaft ( 4 ) to the sixth shaft ( 6 ); and the fourth clutch ( 35 , 13 , 15 ) detachably coupling one of the third shaft ( 3 ) to the fifth shaft ( 5 ), the first shaft ( 1 ) to the third shaft ( 3 ), or the first shaft ( 1 ) to the fifth shaft ( 5 ).