Zf Friedrichshafen Ag

Hugo Burkhart

Bernd Aumann

Ralf Dreibholz

Jürgen Legner

Wolfgang Rebholz

Michael Riedhammer

Siegfried Stützle

Uwe Heitz

Roland Fischer

Ulrich Bohner

Gerhard Buck

Jochen Schneider

Michael Herlitzek

Michael Thielmann

A method for controlling a desired speed of a vehicle having a retarder operating in an overrun condition is proposed, such that the desired speed of the vehicle is controlled by a continuously adjustable retarder braking system and/or an engine braking control system.

Method for controlling the desired speed in an overrun condition for a vehicle comprising a retarder

A method for activating and deactivating the four-wheel drive of a service or a working vehicle not having interaxle differential locks. According to the method, the activation and deactivation of the four-wheel drive is derived from at least one of the following parameters, namely, the driving and load conditions of the vehicle (), the vehicle speed and the output torque of the gearbox.

Method for activating and deactivating the four-wheel drive of service and working vehicles without interactive differential locks

A method for automatically actuating longitudinal blocks in four-wheel vehicles, particularly in working machines and service vehicles. The longitudinal blocks are always open when driving situations occur in which the blocking effect is absolutely unnecessary. The longitudinal blocks are closed in all other situations.

Method for automatically actuating longitudinal blocks in four wheel drive vehicles, in particular in working machines and service vehicles

A shiftable multispeed reverse transmission having one input shaft () and a plurality of countershafts () and one output shaft (). One of gears and/or idle gears being situated upon the countershafts () for non-rotatably connection with the countershafts, via shiftable clutches, for gear and direction change. The reduction ratios being generated by spur pinion stages and at least one shiftable planetary stage (P).

Multispeed manual transmission

A control of a drive train for a wheel loader having one pressure-medium actuated brake and one transmission operated via a torque converter and at least one forward and/or reverse gear respectively actuated via a power shift clutch and one power take off wherein, when a predetermined value of the power delivered by the transmission to the power take off is exceeded, the pressure of the engaged power shift clutch for the forward or reverse gear is reduced to a residual level.

Control of a drivetrain

Shuttle shift control using both a directional clutch and a transmission

Pressure-control device

Growing community of inventors

Ravensburg, Germany

Hugo Burkhart