Patent ID: 7140996

Claim:
A multiple gear transmission of planetary design comprising: a rotatable drive shaft ( 1 ) and a rotatable driven shaft ( 2 ) located within a housing (G); a first planetary gear set (P 1 ); a second planetary gear set (P 2 ); a third planetary gear set (P 3 ); at least third, fourth, fifth, sixth and seventh rotatable shafts ( 3 , 4 , 5 , 6 , 7 ); at least first, second, third, fourth, fifth, sixth and seventh shifting elements ( 03 , 04 , 05 , 06 , 14 , 37 , 57 ) including first, second, third and fourth brakes ( 03 , 04 , 05 , 06 ) and first, second and third clutches ( 14 , 37 , 57 ), and selective engagement of the seventh shifting elements ( 03 , 04 , 05 , 06 , 14 , 37 , 57 ) produces different reduction ratios between the drive shaft ( 1 ) and the driven shaft ( 2 ) so that first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth forward gears and one reverse gear are implemented; the drive shaft ( 1 ) being permanently connected with a sun gear of the first planetary gear set (P 1 ) and being connectable, via the first clutch ( 14 ) and the fourth shaft ( 4 ), with a spider of the third planetary gear set (P 3 ); the driven shaft ( 2 ) being permanently connected with a ring gear of the third planetary gear set (P 3 ); the third shaft ( 3 ) being permanently connected with a ring gear of the first planetary gear set (P 1 ) and a ring gear of the second planetary gear set (P 2 ) and being connectable by the first brake ( 03 ) to the housing (G); the fourth shaft ( 4 ) being permanently connected with a spider of the second planetary gear set (P 2 ) and the spider of the third planetary gear set (P 3 ) and being connectable by the second brake ( 04 ) to the housing (G); the fifth shaft ( 5 ) being permanently connected with a spider of the first planetary gear set (P 1 ) and being connectable by the third brake ( 05 ) to the housing (G); the sixth shaft ( 6 ) being permanently connected with a sun gear of the second planetary gear set (P 2 ) and being connectable by the fourth brake ( 06 ) to the housing (G); and the seventh shaft ( 7 ) being connected, adjacent a first end thereof, with a sun gear of the third planetary gear set (P 3 ) and, adjacent a second end thereof, being detachably connectable, by the second clutch ( 37 ), with the third shaft ( 3 ) and, by the third clutch ( 57 ), with the fifth shaft ( 5 ).