Electrohydraulic valve actuating unit of an internal combustion engine

摘要

The unit (1) has a hydraulic actuator (17) for lifting an engine valve (2) by pressurized liquid. A spring (29) is placed antagonistic to the actuator for closing the valve and discharging the liquid from the actuator in a final closure phase of the valve. An orifice (22) slows down explosion of the liquid and maintains a constant closing velocity of the valve during discharge of the liquid from the actuator.