Abstract
Keywords - transmission concept, dual clutch, gearset layout, mechatronic module, shifting system
Following the considerable success of the 6-speed S tronic in the A3 and TT models, Audi is launching the new 7-speed S tronic in midsize and luxury models in 2008. This will be the first time that a dual-clutch transmission has been combined with the company´s superior quattro® drive. The 7-speed S tronic will thus be continuing the range of completely newly developed, innovative transmissions from Audi. This innovative transmission concept´s extremely short shift times, high-rev stability, individually adaptable wide gear ratios and high performance combine efficiency and sportiness in an outstanding manner, thus making a considerable contribution to the brand essence of "Vorsprung durch Technik".
The paper describes the design of the transmission and deals specifically with the components dual clutch, gearset, mechatronics and oil supply. The advantages of the solutions realised in the transmission are illustrated. In addition, the hydraulics concept - a completely new development - and other innovative detail solutions specially designed for the demands of the luxury car class are presented. The paper concludes with a list of the transmission´s performance data and a feedback from the first introduction during the 2008 International Geneva Motor Show.