Zf Friedrichshafen Ag

Horst Leichsenring

Frank Sauter

Axel Bloching

Armin Gierling

Hermann Lanz

Sascha Fiesel

Ewgeni Bayer

Georg Ege

Berron Hairston

Berthold Schraff

Andreas Jauch

Thomas Aisenpreis

Julius Döpfert

Jochen Birkle

A vehicle transmission has at least one lubrication point, a power take-off, a lubricant tapping point for a power take-off module, and a lubrication system for supplying the lubrication point(s) and the lubricant tapping point with lubricant. The lubrication system includes a lubricant reservoir, a main line section emerging from the lubricant reservoir, a first supply line section leading to the lubrication point(s), a second supply line section leading to the lubricant tapping point, and a return line section leading to the lubricant reservoir. A valve has a first valve port associated with the main line section, a second valve port associated with the lubricant tapping point, a third valve port associated with the return line section, and a bypass duct that acts between the first valve port and the second valve port. A vehicle with such a vehicle transmission and a working machine arrangement are also disclosed.

Vehicle transmission with a power take-off, vehicle and working machine arrangement

A lever () for the temporary disengagement of a parking lock () of a vehicle drive unit (). The lever () comprises a fixing piece () for fitting the lever () onto a parking lock shaft (), which extends inside the vehicle drive unit () and serves to actuate the parking lock (). The lever () is a hand lever with a gripping handle (). The gripping handle () is designed to enable a user to apply a manual force for manual actuation of the lever (). When the lever () is fitted on the parking lock shaft () and moved, the parking lock shaft () is moved from an engagement position to a disengagement position. In the disengagement position, by further movement of the gripping handle () into a locking position, the lever () is blocked against a reverse movement out of the disengagement position.

Hand lever to provisionally disengage a parking lock by hand

A hydrodynamic torque converter () with a lock-up clutch () in a clutch space, () and with a piston () for activating of the lock-up clutch (). The piston () separates the clutch space () from a piston chamber (). The piston (), via the application of pressure, can be moved, from a starting position in which the lock-up clutch () is disengaged, in the engaging direction of the lock-up clutch (). The piston () has at least a closable opening () through which hydraulic fluid can flow from the piston chamber () into the clutch space (). The opening () is open if either the piston () is away from the starting position and/or if a fluid pressure in the piston chamber (), compared to the clutch space (), is elevated. The closing element () is tongue-shaped element which serves closing and opening of the opening ().

Hydrodynamic torque converter with a lock-up clutch

A method for the provisional determination of the mass of a motor vehicle, for controlling a starting operation when the motor vehicle is at rest. The method determines the mass of the motor vehicle as a function of inclination information about the motor vehicle or the road on which the motor vehicle is located, and as a function of a force required for releasing an engaged parking lock while the motor vehicle is at rest.

Method for determining the mass of a motor vehicle

A transmission of a vehicle having a transmission housing which accommodates shifting elements. The transmission has a hydraulic control unit which supplies the shifting elements with hydraulic oil, and which has a valve housing and a duct plate. The valve housing accommodates valves, and the duct plate unit is connected to the transmission housing and contains hydraulic ducts which communicate with hydraulic ducts of the transmission housing, to supply hydraulic oil to the shifting elements. The transmission has a transmission-side power-take-off via which mechanical power can be drawn from the transmission. The transmission has a transmission-internal, controllable clutch for the transmission-side power-take-off, by which the transmission-side power-take-off can be coupled to a transmission shaft to enable mechanical power to be drawn from the transmission shaft, and the transmission-internal, controllable clutch for the transmission-side power-take-off can be supplied from the hydraulic control unit with hydraulic oil for actuation of the clutch.

Transmission of a motor vehicle

A method for actuating a parking lock of a motor vehicle including a piston () which is arranged to move axially within a cylinder () of a parking lock actuator () and is acted upon by pressure in order to disengage the parking lock. A nominal pressure target, for disengaging the parking lock, is continuously increased from a first pressure value (p) until the parking lock is either disengaged or until a maximum pressure value (p) is reached.

Method for activating a parking lock of a motor vehicle

A hydraulic circuit arrangement for operating a hydrodynamic torque converter () with a converter bridging clutch (). The circuit arrangement comprises a hydraulic switching unit () having at least one valve for controlling an inflow flow and a return flow of oil to the converter () and the converter bridging clutch (), an oil cooler (), a first line () for acting upon the converter bridging clutch () with an engagement pressure (P) and a second line () for acting upon the converter bridging clutch () with a disengagement pressure (P). The circuit arrangement comprises a bypass line () which is connected directly with the oil cooler () so as to bypass the hydraulic switching unit ().

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Friedrichshafen, Germany

Horst Leichsenring