Valve deactivation with an electro-hydraulic actuator

摘要

An electro-hydraulic actuator assembly having a plurality of hydraulic pressure operated pistons controlled by a single solenoid operated shut-off and vent valve. Eaton hydraulic piston has an exteriorly extending arm attached thereto for contacting a release latch on the engine valve gear for disablement or deactivation of the valves in selected engine combustion chambers. The actuator assembly is disposed with the shut-off and vent valve vent port vertically above the hydraulic piston bores; and, a bleed orifice is provided for bleed flow from the hydraulic piston bores to the valving chamber in the shut-off and vent valve for permitting bleed flow and air purge. Gravity flow from the vent port may also provide lubrication for the engine cam surface.