Patent ID: 7287442

Claim:
A dual-clutch transmission ( 1 , 30 ) having seven forward gears, the dual-clutch transmission comprising: first and second clutches (K 1 , K 2 ) each having an input side connected with a drive shaft ( 2 ) of a prime mover and an output side thereof connected with one of a hollow input shaft ( 3 ) and a solid input shaft ( 4 ) disposed coaxially to each other; first and second countershafts ( 5 , 6 ) upon which are rotatably supported idler wheels ( 7 , 8 , 9 , 10 , 15 , 16 , 17 , 34 , 35 , 36 ); fixed gear wheels ( 11 , 12 , 13 , 14 , 33 , 37 ) non-rotatably situated upon the hollow and the solid input shafts ( 3 , 4 ) which are in meshing contact with the idler wheels ( 7 , 8 , 9 , 10 , 15 , 16 , 17 , 34 , 35 , 36 ); coupling devices ( 22 , 23 , 24 , 25 , 31 , 32 ) non-rotatably and axially movably supported upon the first and the second countershafts ( 5 , 6 ) and movable by setting devices, and output gear wheels ( 18 , 19 ), which are in meshing contact with an output toothing ( 20 ) on a differential transmission ( 21 ), are respectively fastened on the first and the second countershafts ( 5 , 6 ); wherein first and second fixed wheels ( 13 , 14 ) are situated upon the hollow input shaft ( 3 ) and at least one other fixed wheel (respectively 12 or 37 ) is situated upon the solid input shaft ( 4 ) for respectively driving at least two idler wheels ( 8 , 15 and 35 , 36 ; 9 , 16 ; 10 , 17 ); and the gear wheels of the transmission are sequentially disposed therein, beginning from the first and the second clutches (K 1 , K 2 ), as follows: a reverse gear (RG) and a second gear (G 2 ), a fourth gear (G 4 ) and a sixth gear (G 6 ), a fifth gear (G 5 ) and a seventh gear (G 7 ), a first gear (G 1 ) and a third gear (G 3 ).