Zf Friedrichshafen Ag

Ralf Beck

Ewgeni Bayer

Peter Brielmaier

Disclosed is a method for operating a multi-gear vehicle transmission having a plurality of shifting elements (A, B, C, D, E) for engaging gears of the vehicle transmission. In a neutral gear, in which some of the shifting elements (A, B) are already actuated, a transmission input () is decoupled from a transmission output () of the vehicle transmission. In a driving gear the transmission input () is coupled to the transmission output () of the vehicle transmission by closing the shifting elements (A, B, C, D, E) associated with the driving gear, in order to propel the vehicle. With the neutral gear engaged a transmission condition is determined, and if a transmission condition with elevated drag losses exists, then in addition to the shifting elements (A, B) actuated in the neutral gear a shifting element (D) associated with a reversing gear of the vehicle transmission is also closed.

Method and transmission control apparatus for operating a multiple-speed vehicle transmission

A method is disclosed for operating a multi-gear vehicle transmission in a motor vehicle during a coasting phase. The coasting phase includes an overrun phase with a driving gear engaged and a freewheeling phase with the neutral gear engaged. It is determined whether the motor vehicle is in the overrun phase of the coasting phase, whether a condition for a transition to the freewheeling phase of the coasting phase is fulfilled, and whether a transmission condition with elevated drag losses exists. If the motor vehicle is in the overrun phase of the coasting phase, if the condition for transition to the freewheeling phase is fulfilled, and if a transmission condition with elevated drag losses exists, then at least one further shifting element (D, E) is closed in addition to the shifting elements (A, B, C) of the driving gear, which are closed during the overrun phase of the motor vehicle.

A hydrodynamic torque converter () with a lock-up clutch () in the form of a disk clutch in a clutch space () and with a piston () for actuating the lock-up clutch (). The lock-up clutch () has an end disk () and a first disk carrier (), on which the end disk () is radially and axially supported. The end disk () is arranged on the side of the lock-up clutch () remote from the piston (). The lock-up clutch () has a second disk carrier (). A sealing element () is provided, on the second disk carrier (), a sealing gap () is formed between the end disk () and the sealing element ().

Hydrodynamic torque converter with a lock-up clutch

A hydrodynamic torque converter () with a pump wheel () and with a turbine wheel (), and with a torsion damper () and with an intermediate space () located between the turbine wheel () and the torsion damper (), and with a torus formed by the pump wheel () and the turbine wheel () for hydraulic fluid. A flow-guiding wall () is provided, which deflects a radially outward flow of hydraulic fluid coming from the torus, back radially inward to the intermediate space ().

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Oberteuringen, Germany

Ralf Beck