Patent ID: 8419582

Claim:
A dual-clutch group transmission comprising a splitter group (GV), a main group (HG) and a range group (GP) all arranged in a drive-train axially one after another, the splitter group (GV) and the main group (HG) being formed as countershaft transmissions with at least one common countershaft ( 2 , 3 ) and with at least one of a plurality of gear constants (K 1 , K 2 , K 3 ) and gears ( 1 G, 2 G, RG), the range group (GP) being a planetary transmission with a radially outer ring gear ( 27 ), a central sun gear ( 26 ) and a planetary gearset ( 28 ) located therebetween, and planetary wheels of the planetary gearset being guided by a planetary carrier ( 29 ), an inner transmission input shaft ( 22 ) being connected on an input side to a first clutch (C 1 ), an outer transmission input shaft ( 23 ) being made as a hollow shaft arranged coaxially over the inner transmission input shaft ( 22 ) and connected, on an input side, to a second clutch (C 2 ), a main transmission shaft ( 24 ) being arranged axially adjacent the inner and the outer transmission input shafts ( 22 , 23 ) and connected to the central sun gear ( 26 ), a transmission output shaft ( 30 ) being is arranged axially adjacent the main transmission shaft ( 24 ) and connected, on an output side, to the planetary carrier ( 29 ), shifting elements (S 1 , S 2 , S 3 , S 4 , S 5 , S 6 ) for either engaging gears or forming frictional connections so that, via a first shifting element (S 2 ), the inner transmission input shaft ( 22 ) being directly connectable to the main transmission shaft ( 24 ), an additional hollow shaft ( 25 ) being arranged coaxially over the main transmission shaft ( 24 ), at least one loose wheel ( 18 ), of a forward gear ( 1 G) of the main group (HG), being rotatably mounted on the additional hollow shaft ( 25 ) and being connectable, in a rotationally fixed manner, to the additional hollow shaft by a second shifting element (S 4 ), the additional hollow shaft ( 25 ) being connectable by either a third or a fourth shifting element (S 3 , S 5 ) to the main transmission shaft ( 24 ) and, by the fourth shifting element (S 5 ), to the planetary carrier ( 29 ), the splitter group (GV) having first, second and third gear constants (K 1 , K 2 , K 3 ), of which the first and the second gear constants (K 1 , K 2 ) being arranged on the outer transmission input shaft ( 23 ), and the third gear constant (K 3 ) being arranged on the inner transmission input shaft ( 22 ), the main group (HG) having first and second forward gears ( 1 G, 2 G) and one reverse gear (RG), of which the first gear ( 1 G) and the reverse gear (RG) being arranged on the additional hollow shaft ( 25 ) and the second gear ( 2 G) being arranged on the main transmission shaft ( 24 ), and the range group (GP) being shiftable between a lower, geared range (GPL) and an upper, direct-gear range (GPS).