Electro-hydraulic valve actuator

Details Electro-hydraulic valve actuator Electro-hydraulic valve actuator

F - Mech Eng,Light,Heat,Weapons

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123/186, 342/38

F01L 25/08 (2006.01) F01L 9/02 (2006.01) F01L 9/04 (2006.01)

Patent

CA 2033027

PHA 40 583 18-7-1990 ABSTRACT OF THE DISCLOSURE: A fast acting valve actuator for actuating an intake or exhaust valve in an internal combustion engine of a type which is hydraulically powered and command triggered is disclosed and includes a cylinder with a power piston having a pair of opposed working surfaces or faces reciprocable within the cylinder along an axis between first and second extreme positions. A cylindrical control valve is located radially intermediate the reservoir and the cylinder, and is movable upon command to alternately supply high pressure fluid from a reservoir of high pressure hydraulic fluid to one face and then the other face of the power piston causing the piston to move from one extreme position to the other extreme position. The cylindrical control valve may be a shuttle valve which is reciprocable along the axis of the power piston between extreme positions with control valve motion along the axis in one direction being effective to supply high pressure fluid to move the piston in the opposite direction. Both the control valve and the piston are stable in both of their respective extreme positions and the control valve is spring biased toward a position intermediate the extreme positions. The latter portion of piston motion during one operation of the valve actuator is effective to cock this spring and bias the control valve preparatory to the next operation.

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