Patent ID: 7189181

Claim:
A multi-step transmission of a planetary construction for a motor vehicle, 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 third, fourth, fifth, sixth and seventh shafts ( 3 , 4 , 5 , 6 , 7 ), as well as at least six shifting elements ( 03 , 04 , 05 , 14 , 56 , 67 ), brakes and clutches, whose selective engagement achieves different gear ratios between the input shaft ( 1 ) and the output shaft ( 2 ) so that seven forward gears and one reverse gear can be realized, drive input occurs by the input shaft ( 1 ) which is permanently connected with a first element of the first planetary gear set (P 1 ); drive output occurs via the output shaft ( 2 ) which is permanently connected with a planet carrier of the second planetary gear set (P 2 ) and a planet carrier of the third planetary gear set (P 3 ); the third shaft ( 3 ) is permanently connected with a further element of the first planetary gear set (P 1 ); the fourth shaft ( 4 ) is permanently connected with a ring gear of the second planetary gear set (P 2 ) and a ring gear of the third planetary gear set (P 3 ); the fifth shaft ( 5 ) is permanently connected with a sun gear of the third planetary gear set (P 3 ); the sixth shaft ( 6 ) is permanently connected with a ring gear of the first planetary gear set (P 1 ); the seventh shaft ( 7 ) is connected to a sun gear of the second planetary gear set (P 2 ); the third shaft ( 3 ) can be coupled to the housing (G) by a first brake ( 03 ); the fourth shaft ( 4 ) can be coupled to the housing (G) by a second brake ( 04 ); the fifth shaft ( 5 ) can be coupled to the housing (G) by a third brake ( 05 ); a first clutch ( 14 ) detachably connects the input shaft ( 1 ) and the fourth shaft ( 4 ) with one another; a second clutch ( 56 ) detachably connects the fifth shaft ( 5 ) and the sixth shaft ( 6 ) with one another; and a third clutch ( 67 ) detachably connects the sixth shaft ( 6 ) and the seventh shaft ( 7 ) with one another.