ZF, Porsche and the 8DT
ZF TRW Active and Passive Safety Technology Division (zf.com) and Porsche have collaborated on an innovative 8-speed dual clutch transmission (8DT) that is modular in design and engineering such that it lends itself to a variety of situations.
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ZF TRW Active and Passive Safety Technology Division (zf.com) and Porsche have collaborated on an innovative 8-speed dual clutch transmission (8DT) that is modular in design and engineering such that it lends itself to a variety of situations. That is, this sports transmission can be used for rear-wheel and all-wheel drive setups. It makes electric power an option through the integration of a 100-kW hybrid module—without the need to increase the overall length of the transmission. So all in, the transmission can be used in four variants: standard, all-wheel drive, hybrid and all-wheel hybrid. It is offered in three torque classes, to a maximum of 1,000 Nm.
The 8DT includes two countershafts and one summation shaft. The fixed gears are located on the transmission input shafts; they can be used several times, resulting in fewer wheel levels, which helps make the overall length of the transmission smaller.
According to Dr. Jürgen Greiner, Head of Development for passenger car transmissions at ZF Friedrichshafen AG, “In the new 8DT sports transmission, we combine blazing-fast shifts, a great level of efficiency and all-electric driving with the flexibility to integrate different variants within a tight installation.”
Speaking to the efficient operation of the transmission, Greiner explains, “The first six gears with their compact gradation optimizes acceleration to top speed. In contrast, the 7th and 8th gears are configured as overdrive, so they significantly decrease rpm and fuel consumption, even when not using electric power.”
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