Patent ID: 7699743

Claim:
A automatic multi-speed transmission of a planetary design for a motor vehicle, the transmission comprising: a drive input shaft (AN) and a drive output shaft (AB); first, second, third and fourth planetary gearsets (RS 1 , RS 2 , RS 3 , RS 4 ), and each of the first planetary gearset (RS 1 ), the second planetary gearset (RS 2 ), the third planetary gearset (RS 3 ), and the fourth planetary gearset (RS 4 ) comprising a sun gear, a carrier and a ring gear; at least first, second, third, fourth, fifth, sixth, seventh and eighth rotary shafts ( 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 ) and first, second, third, fourth, and fifth shift elements (A, B, C, D, E), whose selective engagement creates different transmission ratios between the drive input shaft (AN) and the drive output shaft (AB) so that eight forward gears and one reverse gear can be implemented; wherein the ring gear (HO 1 ) of the first planetary gearset (RS 1 ) and the drive input shaft (AN) are coupled in a rotationally fixed manner and form the first shaft ( 1 ); the carrier (ST 4 ) of the fourth planetary gearset (RS 4 ) and the drive output shaft (AB) are coupled in a rotationally fixed manner and form the second shaft ( 2 ); the sun gear (SO 2 ) of the second planetary gearset (RS 2 ) and the sun gear (SO 3 ) of the third planetary gearset (RS 3 ) are coupled in a rotationally fixed manner and form the third shaft ( 3 ); the ring gear (HO 2 ) of the second planetary gearset (RS 2 ) forms the fourth shaft ( 4 ); the ring gear (HO 3 ) of the third planetary gearset (RS 3 ) forms the fifth shaft ( 5 ); the carrier (ST 2 ) of the second planetary gearset (RS 2 ) and the ring gear (HO 4 ) of the fourth planetary gearset (RS 4 ) are coupled in a rotationally fixed manner and form the sixth shaft ( 6 ); 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 in a rotationally fixed manner and form the seventh shaft ( 7 ); the carrier (ST 1 ) of the first planetary gearset (RS 1 ) and the carrier (ST 3 ) of the third planetary gearset (RS 3 ) are coupled in a rotationally fixed manner and form the eighth shaft ( 8 ); the first shift element (A) is arranged between the third shaft ( 3 ) and a transmission housing (GG); the second shift element (B) is arranged between the fourth shaft ( 4 ) and the transmission housing (GG); the third shift element (C) is arranged in a flow of power between one of the first shaft ( 1 ) and the seventh shaft ( 7 ), the first shaft ( 1 ) and the eighth shaft ( 8 ), and the seventh shaft ( 7 ) and the eighth shaft ( 8 ); the fourth shift element (D) is arranged in the flow of power between the fifth shaft ( 5 ) and the sixth shaft ( 6 ); and the fifth shift element (E) is arranged in the flow of power between the fifth shaft ( 5 ) and the seventh shaft ( 7 ).