Patent ID: 7824302

Claim:
A multi-speed transmission of a planetary gearset design for an automatic transmission of a motor vehicle, the transmission having: an input shaft (AN) and an output shaft (AB), first, second, third and fourth planetary gearsets (RS 1 , RS 2 , RS 3 , RS 4 ), at least first, second, third, fourth, fifth, sixth, seventh and eighth rotatable shafts ( 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 ), and first, second, third, fourth and fifth shifting elements (A, B, C, D, E) whose selective engagement provides different speed rotation ratios between the input shaft (AN) and the output shaft (AB) so that eight forward gear ratios, and at least one reverse gear ratio may be realized, and whereby: a carrier (ST 4 ) of the fourth planetary gearset (RS 4 ) and the input shaft (AN) are rotationally connected to one another and form the first shaft ( 1 ); a carrier (ST 3 ) of the third planetary gearset (RS 3 ) and the output shaft (AB) are connected together and form the second shaft ( 2 ); a sun gear (S 03 ) of the third planetary gearset (RS 3 ) and a sun gear (SO 4 ) of the fourth planetary gearset (RS 4 ) are rotationally connected together and form the third shaft ( 3 ); a ring gear (HO 1 ) of the first planetary gearset (RS 1 ) forms the fourth shaft ( 4 ); a ring gear (HO 2 ) of the second planetary gearset (RS 2 ) and a sun gear (SO 1 ) of the first planetary gearset (RS 1 ) are rotationally connected together and form the fifth shaft ( 5 ); a carrier (ST 1 ) of the first planetary gearset (RS 1 ) and a ring gear (HO 3 ) of the third planetary gearset (RS 3 ) are rotationally fixed to one another and form the sixth shaft ( 6 ); a sun gear (SO 2 ) of the second planetary gearset (RS 2 ) and a ring gear (HO 4 ) of the fourth planetary gearset (RS 4 ) are rotationally connected together and form the seventh shaft ( 7 ); a carrier (ST 2 ) of the second planetary gearset (RS 2 ) forms the eighth shaft ( 8 ); the first shifting element (A) is located between the third shaft ( 3 ) and a housing (GG) of the transmission; the second shifting element (B) is located between the fourth shaft ( 4 ) and the housing (GG) of the transmission; the third shifting element (C) is located in a power flow direction between the fifth shaft ( 5 ) and the first shaft ( 1 ); the fourth shifting element (D) is located in the power flow direction either between the eighth shaft ( 8 ) and the second shaft ( 2 ) or between the eighth shaft ( 8 ) and the sixth shaft ( 6 ), and the fifth shifting element (E) is located in the power flow direction either between the seventh shaft ( 7 ) and the fifth shaft ( 5 ) or between the seventh shaft ( 7 ) and the eighth shaft ( 8 ) or between the fifth shaft ( 5 ) and the eighth shaft ( 8 ).