Hydraulic system for hydraulically switching gears of e.g. eight-gear-dual coupling transmission, has dual cylinders alternatively supplied with high and low system pressures by rotary slide valve that is actuated by hydraulic motor

摘要

The system has dual cylinders (1-4) with a dual piston (24), whose sides (24.1, 24.2) are connected with inlets (6, 8) of a rotary slide valve (5). The dual cylinders are alternatively supplied with high and low system pressures (pH, pN) by the valve, which is actuated by a hydraulic motor (13). The hydraulic motor and the inlet (6) are supplied with a high system pressure by a proportional valve (7), which is actuated by an electrically controlled actuator (20).