Patent ID: 7582040

Claim:
A multi-speed automatic gearbox of a planetary design for a motor vehicle, the gearbox comprising: an input shaft (AN), 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 determines a variety different gear ratios between the input shaft (AN) and the output shaft (AB) such that eight forward gears and at least one reverse gear can be implemented; a carrier (ST 3 ) of the third planetary gearset (RS 3 ) and the output shaft (AB) are coupled one another and comprise the second shaft ( 2 ); a sun gear (SO 1 ) of the first planetary gearset (RS 1 ) and a sun gear (SO 4 ) of the fourth planetary gearset (RS 4 ) are coupled one another and comprise the third shaft ( 3 ); a ring gear (HO 1 ) of the first planetary gearset (RS 1 ) is integral with the fourth shaft ( 4 ); a carrier (ST 1 ) of the first planetary gearset (RS 1 ) and a ring gear (HO 3 ) of the third planetary set (RS 3 ) are coupled one another and comprise 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 coupled one another and comprise the seventh shaft ( 7 ); a carrier (ST 2 ) of the second planetary gearset (RS 2 ) is integral with the eighth shaft ( 8 ); a ring gear (HO 2 ) of the second planetary gearset (RS 2 ) and the input shaft (AN) are coupled one another and comprise the first shaft ( 1 ); a sun gear (SO 3 ) of the third planetary gearset (RS 3 ) and a carrier (ST 4 ) of the fourth planetary gearset (RS 4 ) are coupled one another and comprise the fifth shaft ( 5 ); the first shifting element (A) being between the third shaft ( 3 ) and a gearbox housing (GG); the second shifting element (B) being located between the fourth shaft ( 4 ) and the gearbox 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 fourth shifting element (D) being located, in the direction of power flow, between the eighth shaft ( 8 ) and the second shaft ( 2 ); and the fifth shifting element (E) being located, in the direction of power flow, between the fifth shaft ( 5 ) and the eighth shaft ( 8 ).