Torque converter and lock-up clutch arrangement

摘要

A torque transfer system for the drive train of a motor vehicle equipped with a gear-change gearbox. The system includes a torque converter 11 which is in driving connection with a drive assembly of the vehicle and is in active connection through an output shaft with an automatic gearbox connected on the output side. A friction clutch 12 is mounted parallel to the hydrodynamic converter and will be operated by the pressurised flow medium. The clutch has a pressure chamber 24 between a turbine wheel of the converter and a ring piston connected to a friction disc on one side, and another pressure chamber 25 between the ring piston and a converter cover on the other side. The pressure chambers are designed so that a differential pressure existing between them determines the torque transferable by the friction clutch. The system also has a measured value detection system, a central computer unit and a hydraulic system which in conjunction with the computer unit produces a change in the differential pressure between the two pressure chambers and thus in the torque transferable by the friction clutch. The clutch is controlled in all driving gears and the torque converter has a torque conversion > 2.5.