Patent ID: 7637840

Claim:
A dual-clutch planetary transmission ( 1 ) comprising: first, second, third and fourth planetary gear sets (P 1 , P 2 , P 3 , P 4 ), at least first and second frictional shifting elements (K 1 , K 2 ) for selecting different power paths in a power flow, and first, second, third, fourth, fifth, sixth and seventh shape-fit, shifting elements (A to F) for selecting gear ratio stages in the power paths, the first planetary gear set (P 1 ) being a simple planetary gear set, the second planetary gear set (P 2 ), the third planetary gear set (P 3 ) and the fourth planetary gear sets (P 4 ) forming a 3-carrier-5-shaft transmission apparatus with separate planetary gears (PR 2 to PR 4 ), the first and the second frictional shifting elements (K 1 , K 2 ) being positioned between a transmission input shaft ( 3 ) and the first planetary gear set (P 1 ) and at least one of the first and the second frictional shifting elements (K 1 K 2 ) is a clutch, and the first, the second, the third, the fourth, the fifth, the sixth, and the seventh shape-fit, shifting elements (A to F) being arranged between the first planetary gear set (P 1 ) and the second planetary gear set (P 2 ), and the first, the second, the third, the fourth, the fifth, the sixth, and the seventh shape-fit, shifting elements (A to F) are positioned between shafts (S 1 to S 4 , ST 1 to ST 4 , HR 1 to HR 4 ) of the first, the second, the third, and the fourth planetary gear sets (P 1 to P 4 ), a housing ( 2 ), a transmission input shaft ( 3 ) and a transmission output shaft ( 4 ), such that at least first, second, third, fourth, fifth and sixth gear ranges ( 1 to 6 ) can be accomplished in a manner free of interruption of traction.