Patent ID: 6666178
Filing Date: 2003-12-23
Classification: F01L

Abstract:
An electro-hydraulic operator for use in engine valve de-actuation comprising:(a) a valve body having a valving cavity therein with an inlet port having a first valving surface associated therewith and a vent port having a second valving surface associated therewith and the inlet port adapted for connection to a source of pressurized hydraulic fluid; (b) at least one piston bore communicating with said valving cavity; (c) a piston slidably disposed in said piston bore and moveable in response to fluid pressure therein; (d) an actuation member extending externally of said body and attached to said piston for movement therewith; (e) an obturator disposed in said cavity and moveable for opening and closing with respect to said first valving surface and said second valving surface for permitting and preventing flow between said inlet port and said valving cavity and between said cavity and said vent port; (f) a solenoid disposed with said body and having an armature operatively connected for, upon energization and de-energization, effecting said movement of said obturator, wherein said actuator member is adapted for operative contact with a valve de-actuation component of the engine; and, (g) a bleed passage in said body communicating said at least one piston bore with said vent port, said bleed passage operative to permit limited flow for air purging from said inlet port through said at least one bore to said vent port when said obturator is closed against said first valving surface and is open with respect to said second valving surface.