Zf Friedrichshafen Ag

Michael Preuβ

Bernd Schepperle

Johannes Kaltenbach

Matthias Reisch

Kai Bornträger

Ulrich Kehr

A dual clutch transmission for a motor vehicle including two sub-transmissions, each having at least one input shaft. An output shaft outputs drive from both sub-transmissions. The input shafts are arranged on an input shaft axis and the output shaft is arranged on the input shaft axis or a parallel countershaft axis. An intermediate gear system includes at least one countershaft which is arranged on the countershaft axis. At least four shifting elements are arranged such that, in each case, at least two shifting elements are arranged on the input shaft axis and on the countershaft axis. At least one input shaft can be connected to the output shaft by way of two wheel planes and/or at least one shifting element. Preferably half of the shifting elements are unsynchronized and at least one-third of the shifting elements are synchronized. Also a method for operating a dual clutch transmission.

Transmission for a motor vehicle

A dual-clutch transmission having first and second clutches which selectively engage to couple a drive shaft with a respective first and second input shaft. The input shafts are coaxially aligned with the first input shaft extending through the second input shaft. A transmission output shaft is coaxially aligned with and extends behind the input shafts. Either six, seven or eighth forward gears and at least two reverse gears are produced by gearwheels that are arranged in six gearwheel planes on the input and the output shafts and a countershaft. The gearwheel planes are sequentially arranged axially along the transmission. Depending on the shifting positions of eight interlocking shifting elements, when six forward gears are provided, the last forward gear is a direct gear. In contrast, when either seven or eight forward gears are provided, the last forward gear, in each case, is an overdrive gear.

Double clutch transmission

A drive-train for a vehicle with at least one electric drive, which can be coupled via a driveshaft () to at least a first transmission ratio stage (i) and a second transmission ratio stage (i). At least one shifting mechanism is provided for engaging the transmission ratio stages (i, i). To carry out powershifts, the shifting mechanism includes at least one interlocking shifting element () and at least one frictional shifting element (A). Each of the transmission ratio stages (i, i) can be engaged by the interlocking shifting element () and at least one of the transmission ratio stages (i) can be engaged both by the interlocking shifting element () and by the frictional shifting element (). Methods for carrying out a powershift, between a frictional shifting element (A) and an interlocking shifting element () in the drive-train, are also disclosed.

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Meersburg, Germany

Michael Preuβ