With the 8HP transmission generation, ZF established a model range on the market offering considerable progress in terms of fuel savings, power-to-weight ratio, and functionality. A front-transverse transmission derived from the 8HP transmission generation gearset concept leads to higher design costs and to an unfavorable design, contradicting the very restricted installation spaces for front-transverse transmissions. With the here introduced transmission concept of the 9HP48 transmission, the advantages of the 8HP transmission generation were successfully transferred to a front-transverse transmission design and, at the same time, all restrictions regarding the installation space were solved. Thanks to its number of gears, the high efficiency, and the reduced drag torque, the 9HP48 transmission delivers excellent fuel savings. A central development focus for the 9HP48 control unit was functions and software development. In the case of functions development, the central challenge were new customer functions, enhanced diagnosis options, requirements for functional safety, as well as dog clutch control and dog clutch monitoring. New methods and a new approach became necessary in order to secure the control unit's readiness for start of production. The publication gives a detailed description of the mechanical design and the control unit of the 9HP48 transmission. For the first time, two positive locking dog clutch shift elements are applied alongside an axially parallel vane cell pump to reduce the drag torques, as well as an electronic control unit produced by ZF Group.
9-speed transmission for front wheel drive applications
2013
24 Seiten, 20 Bilder, 4 Quellen
Conference paper
English
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