US Patent 7409886 Twin clutch transmission with coaxial drive and output

The invention relates to a twin clutch transmission of high efficiency which is compact in every dimension. This twin clutch transmission can be used particularly in vehicles having a longitudinally installed engine. For this purpose, the transmission input shaft and the transmission output shaft are arranged coaxially with respect to one another, whereas the two countershafts are arranged parallel to one another. Furthermore, the shift sleeves are arranged in a special way, thus making seven forward gears and a plurality of reverse gears possible.