Zf Friedrichshafen Ag

Andreas Graf

Mario Steinborn

Josef Bader

Martin Miller

Thomas Hafen

Markus Ulbricht

Karl-Fritz Heinzelmann

Kim Führer

Ludger Ronge

Jochen Breuer

Gerhard Höring

Gerhard Birkenmaier

Kai Heinrich

Frank Gessler

Henrik Schuh

Martin Rist

Jürgen Rauter

Hubert König

Gerhard Hoering

Bernhard Walter

Manfred Vetter

Klaus Wöhr

Johannes Ehrminger

Bernd Woelfle

An assembly () for actuating a transmission brake () that has a transmission brake cylinder (), at least one control valve () for controlling pressurizing and/or exhausting of the transmission brake cylinder (), and at least one pressure line () via which the at least one control valve () is connected to the transmission brake cylinder () to supply a pressure medium () to and discharge the pressure medium () from a pressure chamber () of the transmission brake cylinder (). The assembly () includes a quick-exhaust valve (), which is arranged in the pressure line () between the transmission brake cylinder (), and the at least one control valve ().

Control arrangement for a transmission brake with a quick exhaust valve

A transmission system for either a manual shift transmission, an automatic transmission or an automated transmission in which the electrical connections and the pneumatic connections including any ventilation port, for the internal components of the transmission are combined with one another so as to exit the transmission housing via a single unified connection formed in the housing wall of the transmission.

Transmission system

A method of operating a drivetrain of a motor vehicle. The drivetrain comprises a transmission arranged between a drive assembly and an axle drive, such that an input shaft of the transmission is connected, via a controllable separator clutch, to the drive assembly and an output shaft of the transmission is connected to the axle drive, and such that the transmission comprises at least one shifting element formed as a claw clutch. To reduce the probability that a tooth-on-tooth position may occur in a shifting element formed as a claw clutch, a torque is applied thereto by at least one transmission-internal assembly and/or at least one transmission-external assembly so that a speed difference at the claw clutch approaches a predetermined nominal value, and engagement of the claw clutch is only started when the speed difference of the claw clutch reaches the nominal value.

Method for operating a drive train

A method for shifting an automated transmission situated in a drive train of a motor vehicle between an engine and a drive axle and having at least one multi-speed main transmission and a two-speed range change group rear-mounted thereon. The main transmission has at least one counter shaft with a transmission brake. A clutch engages the prime mover and the main transmission and the range change group is shifted via unsynchronized dog clutches which are combined in pairs in a common shift set and have two shift positions and one neutral position such that, during a range change gear shift both in the main transmission and the range change group a change between two ratio stages occurs. A range change up-shift includes synchronizing the input shaft and the target gear utilizing the transmission brake and passively synchronizing the dog shifted transmission parts by the edge beveling of the concerned dog clutches.

Method for shifting actuation of an automated group transmission

A method for shifting an automated transmission situated in a drive train of a motor vehicle between an engine and a drive axle and having at least one multi-speed main transmission and a two-speed range change group rear-mounted thereon. The main transmission has at least one counter-shaft with an transmission brake. A clutch engages the prime mover and the main transmission and the range change group is shifted via unsynchronized dog clutches, which are combined in pairs in a common shift set having two shift positions and one neutral position such that during a range change gearshift, both in the main transmission and in the range change group, a change between two ratio stages occurs. A range change up-shift and down-shift each include active synchronization of the dog clutch by way of the transmission brake and of the separating clutch.

Method for shifting actuation of an automated transmission

Growing community of inventors

Stockach-Wahlwies, Germany

Andreas Graf