Hydraulische Betätigungseinrichtung zur Betätigung einer Reibungskupplung und eines automatisierten Schaltgetriebes

摘要

The hydraulic actuator (10) has two hydraulic regulator cylinders (46,68,70), and two proportional hydraulic valves (44,62,64,66). A command valve (54) supplies hydraulic fluid to one of these valves as a function of hydraulic pressure from one of the valves (44). A valve holds the clutch disengaged under emergency conditions, independently of losses from valves.