Patent ID: 7507179

Claim:
A multi-speed transmission of a planetary design for an automatic transmission of a motor vehicle, the transmission comprising: an input shaft ( 1 ) and an output shaft ( 2 ) arranged in a housing (G); 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 third, fourth, fifth and sixth rotatable shafts ( 3 , 4 , 5 , 6 ), as well as at least five control elements ( 03 , 04 , 13 , 14 , 36 ) comprising first and second brakes ( 03 , 04 ) and first, second and third clutches ( 13 , 14 , 36 ) whose selective engagement creates different gear ratios between the input shaft ( 1 ) and the output shaft ( 2 ) so that at least first, second, third, fourth, fifth and sixth forward gears and one reverse gear are implemented; wherein the input shaft ( 1 ) is permanently connected to the sun gear of the second planetary gear set (P 2 ) and is couplable, via the first clutch ( 13 ), to the third shaft ( 3 ) and the input shaft ( 1 ) is couplable, via the second clutch ( 14 ), to the fourth shaft ( 4 ); the third shaft ( 3 ) is permanently connected to the carrier of the first planetary gear set (P 1 ) and the third shaft ( 3 ) is couplable, via the first brake ( 03 ), to the housing (G) and is couplable, via the third clutch ( 36 ), to the sixth shaft ( 6 ); the fourth shaft ( 4 ) is permanently connected to the sun gear of the first planetary gear set (P 1 ) and is couplable, via the second brake ( 04 ), to the housing (G); the fifth shaft ( 5 ) is permanently connected to the internal gear of the first planetary gear set (P 1 ) and the carrier of the third planetary gear set (P 3 ); the sixth shaft ( 6 ) is permanently connected to the internal gear of the second planetary gear set (P 2 ); the output shaft ( 2 ) is permanently connected to the internal gear of the third planetary gear set (P 3 ) and the carrier of the second planetary gear set (P 2 ); and the sun gear of the third planetary gear set (P 3 ) fixed, via a seventh shaft ( 0 ), to the housing (G).