Patent ID: 7137923

Claim:
A multiple gear transmission of a planetary design, for an automatic transmission of 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 and sixth rotatable shafts ( 1 , 2 , 3 , 4 , 5 , 6 ) and a first, second, third, fourth, fifth and sixth shifting elements ( 03 , 04 , 13 , 15 , 46 , 56 ), the shifting elements including first and second brakes ( 03 , 04 ) and first, second, third and fourth clutches ( 13 , 15 , 46 , 56 ), and selective engagement of the six shifting elements ( 03 , 04 , 13 , 15 , 46 , 56 ) produces different reduction ratios between the drive shaft ( 1 ) and the driven shaft ( 2 ) so that up to eight forward gears and at least one reverse gear can be implemented, the drive shaft ( 1 ) is permanently connected with a ring gear of the first planetary gear set (P 1 ) and connectable, via the second clutch ( 15 ), with the fifth shaft ( 5 ) which is connected with a sun gear of the second planetary gear set (P 2 ) and connectable with the sixth shaft ( 6 ), via the fourth clutch ( 56 ), the sixth shaft ( 6 ) is connected, adjacent one end, with a spider of the first planetary gear set (P 1 ) and adjacent a second end, detachably connectable, via the third clutch ( 46 ), with the fourth shaft ( 4 ) which is permanently connected with a ring gear of the third planetary gear set (P 3 ) and a spider of the second planetary gear set (P 2 ) and attachable, via the second brake ( 04 ), to the housing (G), the driven shaft ( 2 ) is connected with a spider of the third planetary gear set (P 3 ), the third shaft ( 3 ) is permanently connected with a sun gear of the third planetary gear set (P 3 ) and a ring gear of the second planetary gear set (P 2 ), and the third shaft ( 3 ) is detachably connectable, via the first clutch ( 13 ), with the drive shaft ( 1 ) and attachable, via the first brake ( 03 ), to the housing (G), and a sun gear of the first planetary gear set (P 1 ) is non-rotatably connected via a seventh shaft ( 0 ) with the housing (G).