Patent ID: 7597646

Claim:
A multi-speed automatic transmission of a planetary construction for a motor vehicle, comprising an input shaft (AN), an output shaft (AB), first, second, third and fourth planetary gearsets (RS 1 , RS 2 , RS 3 , RS 4 ) with each of the planetary gearsets having a carrier, a sun gear and a ring gear, 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 create different gear ratios between the input shaft (AN) and the output shaft (AB) to implement at least a reverse gear, and first, second, third, fourth, fifth, sixth, seventh and eighth forward gears; the carrier (ST 4 ) of the fourth planetary gearset (RS 4 ) and the input shaft (AN) are coupled with one another to form the first shaft ( 1 ); the ring gear (HO 2 ) of the second planetary gearset (RS 2 ), the carrier (ST 3 ) of the third planetary gearset (RS 3 ) and the output shaft (AB) are coupled with one another to form the second shaft ( 2 ); the sun gear (SO 1 ) of the first planetary gearset (RS 1 ) and the sun gear (S 04 ) of the fourth planetary gearset (RS 4 ) are coupled with one another to form the third shaft ( 3 ); the ring gear (HO 1 ) of the first planetary gearset (RS 1 ) forms the fourth shaft ( 4 ); the sun gear (S 03 ) of the third planetary gearset (RS 3 ) and the carrier (ST 2 ) of the second planetary gearset (RS 2 ) are coupled with one another to form the fifth shaft ( 5 ); the carrier (ST 1 ) of the first planetary gearset (RS 1 ) and the ring gear (HO 3 ) of the third planetary gearset (RS 3 ) are coupled with one another to form the sixth shaft ( 6 ); the ring gear (HO 4 ) of the fourth planetary gearset (RS 4 ) forms the seventh shaft ( 7 ); the sun gear (SO 2 ) of the second planetary gearset (RS 2 ) forms the eighth shaft ( 8 ); the first shifting element (A) being located between the third shaft ( 3 ) and a transmission housing (GG); the second shifting element (B) being located between the fourth shaft ( 4 ) and the transmission housing (GG); the third shifting element (C) being located, in a direction of power flow, between the first shaft ( 1 ) and the fifth shaft ( 5 ); the fifth shifting element (E) being located, in the direction of power flow, between the seventh shaft ( 7 ) and the fifth shaft ( 5 ); and the fourth shifting element (D) being located, in the direction of power flow, between the seventh shaft ( 7 ) and the eighth shaft ( 8 ).