Patent ID: 7611438

Claim:
A multispeed automatic transmission, of a planetary gear design, for a motor vehicle, the transmission comprising: a drive shaft ( 1 ) and an output shaft ( 2 ) located within a housing (G); first, second and third planetary gear sets (P 1 , P 2 , P 3 ); at least additional third, fourth, fifth, sixth and seventh rotating shafts ( 3 , 4 , 5 , 6 , 7 ); a plurality of shift elements ( 03 , 04 , 05 , 15 , 57 , 67 ), including first, second and third brakes ( 03 , 04 , 05 ) and first, second and third clutches ( 15 , 57 , 67 ), whose selective engagement results in a plurality transmission gear ratios between the drive shaft ( 1 ) and the output shaft ( 2 ) and achieves at least eight forward gears and at least one reverse gear; a sun gear of the second planetary gear set (P 2 ) being fixed the drive shaft ( 1 ) and being detachably coupled, via the first clutch ( 15 ), with the fifth shaft ( 5 ); a carrier of the first planetary gear set (P 1 ) being fixed to the fifth shaft ( 5 ) and being detachably coupled, via the third brake ( 05 ), to the housing ( 0 ), and being detachably coupled, via the second clutch ( 57 ), to the seventh shaft ( 7 ); a carrier of the second planetary gear set (P 2 ) being fixed to the seventh shaft ( 7 ) and being detachably coupled, via the third clutch ( 67 ), to the sixth shaft ( 6 ); a sun gear of the first planetary gear set (P 1 ) and a ring gear of the third planetary gear set (P 3 ) being fixed to the sixth shaft ( 6 ); a ring gear of the second planetary gear set (P 2 ) and a carrier of the third planetary gear set (P 3 ) being fixed to the first shaft ( 3 ) and being detachably coupled, via the first brake ( 03 ), with the housing (G); a sun gear of the third planetary gear set (P 3 ) being fixed to the fourth shaft ( 4 ) and being detachably coupled, via the second brake ( 04 ), with the housing (G); and a ring gear of the first planetary gear set (P 1 ) being fixed to the output shaft ( 2 ).