Zf Friedrichshafen Ag

Pedro Casals

Gabor Diosi

Peter Ziemer

Gerhard Gumpoltsberger

Josef Haupt

Martin Brehmer

Jürgen Wafzig

Uwe Heitz

Bernd Vahlensieck

A multi-speed automatic planetary transmission for a motor vehicle having an input shaft (AN), an output shaft (AB), four planetary gearsets (RS, RS, RS, RS), at least eight rotatable shafts (), and five shifting elements (A, B, C, D, E), the selective engagement of which produces different transmission ratios between the input shaft (AN) and the output shaft (AB), such that eight forward gears and at least one reverse gear are possible. Further, it is possible to connect an electric machine () as generator and/or drive, to the fifth shaft () by means a drive connection.

Multi-speed transmission

A split power transmission with a variable drive, a brake, a clutch, an integrating transmission containing a planetary set, the internal gear forming the output of the transmission, and an additional planetary set located between the drive shaft and the transmission. A portion of the transmission drive shaft power is transferable to the transmission which includes a secondary shaft located axially parallel to the variable drive. The power of the variable drive is directed towards the integrating transmission via the secondary shaft by using a defined transmission ratio. Torque division in the low cruising range and is achieved by locking the brake connecting the internal gear of the planetary set located between the drive shaft, and the transmission to the unit. Whereas in the high cruising range, by engaging the clutch the sun gear of the transmission is interlocked with the internal gear of the transmission.

Split power transmission to include a variable drive

Growing community of inventors

Tettnang-Kau, Germany

Pedro Casals