Patent ID: 7131926

Claim:
A multiple gear transmission of a planetary design for an automatic transmission of a motor vehicle, comprising a drive shaft ( 1 ) and a driven shaft ( 2 ) located in a housing (G), first, second and third planetary gear sets (P 1 , P 2 , P 3 ), third, fourth, fifth, sixth and seventh rotatable shafts ( 3 , 4 , 5 , 6 , 7 ), and first, second, third, fourth, fifth and sixth shifting elements ( 03 , 04 , 17 , 37 , 46 , 56 ) comprising first and second brakes ( 03 , 04 ) and first, second, third and fourth clutches ( 17 , 37 , 46 , 56 ), and selective engagement of the six shifting elements ( 03 , 04 , 17 , 37 , 46 , 56 ) produces different reduction ratios between the drive shaft ( 1 ) and the driven shaft ( 2 ) so that up to nine forward gears and one reverse gear can be implemented, wherein the drive shaft ( 1 ) is permanently connected with a spider of the first planetary gear set (P 1 ) and detachably connectable, via the first clutch ( 17 ), with the seventh shaft ( 7 ) which is connected with a sun gear of the second planetary gear set (P 2 ), the driven shaft ( 2 ) is connected with a ring gear of the second planetary gear set (P 2 ) and a spider of the third planetary gear set (P 3 ), the third shaft ( 3 ) is, adjacent one end, connected with a sun gear of the first planetary gear set (P 1 ) and, adjacent a second end, attachable to the housing (G), via the first brake ( 03 ), and detachably connectable with the seventh shaft ( 7 ), via the second clutch ( 37 ), the fifth shaft ( 5 ) is connected with a ring gear of the first planetary gear set (P 1 ) and a sun gear of the third planetary gear set (P 3 ) and the fifth shaft ( 5 ) is, via the fourth clutch ( 56 ), detachably connectable with the sixth shaft ( 6 ) which is connected with a spider of the second planetary gear set (P 2 ) and, via the third clutch ( 46 ), is detachably connectable with the fourth shaft ( 4 ) connected with a ring gear of the third planetary gear set (P 3 ), and the fourth shaft ( 4 ) is attachable to the housing (G) via the second brake ( 04 ).