Abstract
Keywords - transmission technologies, life-cycle costs, hybrids, trends, global engineering
ZF has more than 10 years of production experience with fully automatic twopedal manual transmissions (AMTs) with their second generation for commercial vehicles. Requirements have risen significantly in this decade. Torques are higher both in the traction and in the coasting mode. Temperatures, service life and noise requirements, are more demanding now. The AMTs play an important role in the electronic vehicle system network communication with engine and braking systems as well as retarders and PTOs.
Today, drivers have many tasks relating to traffic. Now, they can fully concentrate on the road thanks to the use of such AMTs. These systems automatically select the best gear for lowest fuel consumption and good driveability. Also the setting off, maneuvering, and shifting comfort was further improved. Life cycle costs are being minimized, not only by lower fuel consumption but also by a much longer clutch life and significantly longer oil change intervals.
Processes, requirements, and the experience gained to achieve a high-quality, robust, and reliable unit are shown. The most important trends and improvements for the mid- and longterm further development and supplements of this transmission design are described. These are primarily complements generated through hybrid modules. Considerations relating to successful global engineering provide the perfect edge to the contribution as such.