Hydraulic system for use in drive train of motor car, has hydraulic pump arranged in drive train of motor car in torque flow between engine and variator, and hydraulic device providing required variator contact pressure with help of pump

摘要

The system (1) has a hydraulic pump (3) designed as a pump torque sensor. The pump is arranged in a drive train (6) of a motor car in a torque flow between an internal combustion engine (8) and a variator (5) i.e. belt-driven conical pulley transmission, so that the hydraulic pump provides a torque flow-dependant pressure. A hydraulic device (20) provides a required variator contact pressure with help of the pump. The hydraulic device includes a valve torque sensor e.g. 3/2 directional valve construction type pressure reducing valve, which is associated to an output side (14) of the variator.