Patent ID: 7540823

Claim:
A dual-clutch transmission ( 1 ) comprising a multiplicity of shiftable gears, first and second input shafts ( 8 , 9 ) of which the first input shaft ( 8 ) is a hollow shaft and the second input shaft ( 9 ) is a solid shaft, the second input shaft ( 9 ) being co-axially supported in the first input shaft ( 8 ), the first and the second input shafts ( 8 , 9 ) transmit torque from a prime mover ( 4 ) to the dual clutch transmission ( 1 ), the dual-clutch transmission ( 1 ) has a dual clutch ( 2 ), an output shaft ( 12 ) and at least a first countershaft ( 10 ) which is a hollow shaft and contains a second countershaft ( 11 ) rotatably supported in relation thereof, at least one electric machine (EM 1 -EM 6 ) is situated so as to be capable of at least one of supplying and receiving torque directly to one at least one of an input side ( 5 ) of the dual clutch ( 2 ), one of the first and the second input shafts ( 8 , 9 ), at least one transmission countershaft ( 10 , 11 ) and in at least the output shaft ( 12 ); and the electric machine is situated so that the electric machine acts directly upon the input side ( 5 ) of the dual clutch ( 2 ).