Zf Friedrichshafen Ag

Rayk Hoffmann

Alan Dittrich

Oliver Schell

Martin Lamke

Thomas Gnandt

An automated multi-group transmission of a motor vehicle comprises at least two gearing groups successively disposed in a power flow of a drive train, a clutch assembly having at least one start-up clutch, by which a connection can be established between a drive shaft of a drive motor and a transmission input shaft associated with a first gearing group, a shifting device, by which a connection can be established between the transmission input shaft and a transmission main shaft associated with a second gearing group, whereby the transmission main shaft is designed as a transmission output shaft or is at least functionally connected to a transmission output shaft, and a structure by which the tractive force gear shifting can be carried out.

Automated multi-group transmission of a motor vehicle and method for operating an automated multi-group transmission

A device for a vehicle drive train for generating and transmitting drive torque to components of the drive train. The device comprises a shaft which is connected to the components of the drive train, at least first and second bearings which support the shaft and an electric motor for generating the transmitted drive torque. The electric motor comprises a stator and a rotor which is fixed to the shaft. The rotor is supported by one or more bearing surfaces. The device also comprises elements disposed on the shaft via which drive torque can be transmitted to the components of the drive train while introducing transverse force into the shaft. The rotor of the drive motor is positioned on the shaft such that the bearing surface is located in the region of maximum deflection caused by the transverse force in the shaft.

Device for generating and transmitting drive torque

An arrangement for reducing rattling in a transmission of counter shaft design having first countershafts () and a load-equalizing main shaft () in which each transmission ratio step comprises a loose wheel (), arranged on the main shaft (), and a respective fixed wheel () arranged on each of the first and second countershafts () which are in active engagement with one another. Activation of the transmission ratios occurs by actuating a shift element () such that the respective loose wheel can be connected, in a rotationally fixed manner, to the main shaft (). In this arrangement the oil pump () of the transmission is mounted on the main shaft ().

Arrangement for reducing rattling in a transmission

A motor vehicle transmission having at least two transmission groups and a method for operation of the transmission in which a mechanism is provided for maintaining traction force during gearshifts. A first friction clutch is an intermediate-gear clutch connected to a driveshaft of the motor and to a main transmission shaft which is connected with a transmission output shaft, the second friction clutch is a change-under-load clutch connected to the driveshaft and to a loose wheel of a second gear constant of a splitter group, and the third friction clutch is a change-under-load clutch connected with the driveshaft and with a loose wheel of a first gear constant of the splitter group. A direct connection can be formed in the transmission between the driveshaft and the main transmission shaft by way of the intermediate-gear clutch and the gear constants of the splitter group can be shifted, under load, by the change-under-load clutches.

Multi-group transmission of a motor vehicle

A multi-group transmission of a vehicle is arranged in a drivetrain and includes traction force support during gearshift operations. A clutch mechanism, including a frictional clutch and two shifting clutches is arranged between a drive motor with a driveshaft and a transmission input shaft, such that the driveshaft can be connected to the transmission input shaft by one shifting clutch in a first shift position in combination with the frictional clutch or in a second shift position with bridging of the frictional clutch, such that the driveshaft can be directly connected to a main transmission shaft by the other shifting clutch in a shift position in active combination with the frictional clutch. In a method for operating the transmission, the frictional clutch is controlled and operated in combination with the first shifting clutch as a starting clutch and with the second shifting clutch as an intermediate-gear clutch.

Growing community of inventors

Friedrichshafen, Germany

Rayk Hoffmann