Clutch gear box e.g. dual clutch transmission for motor of internal combustion engine, has electrically actuated pilot valves which are provided for selectively connecting hydraulic switching valve to hydraulic fluid source

摘要

The gear box has electrically controlled hydraulic pressure control valves (101,101') which are provided for selectively connecting the clutches (K1,K2) to a hydraulic fluid source (53). A safety valve assembly is provided between hydraulic medium source and pressure regulating valve. The safety valve assembly is comprised of hydraulic switching valves (91,91') and hydraulic pilot valves (121,121'). The electrically actuated pilot valves are provided for selectively connecting the hydraulic switching valves to hydraulic fluid source.