Hydraulic system for high-low gearbox with hydrodynamic converter has low-pressure pump supplying converter and gearbox with oil, high-pressure pump supplying pressure required to drive shift elements

摘要

The system has a converter bridging coupling (7), a low-pressure pump (1) and a high-pressure pump (2), each integrated into low-pressure and/or high-pressure oil circuit. The low-pressure pump supplies the converter (3) and the gearbox with oil required for converter operation and lubrication and the high-pressure pump supplies the pressure required to drive the gearbox shift elements.