Electro-magnetic-hydraulic valve drive for internal combustion engines

Valve drive for a combustion engine with a hydraulic transmission system between a control member and a valve, comprising means for stepping up the hydraulic transmission, the valve having a first cylinder wherein a first piston displaceable by the control member slides and a second cylinder tightly connected by at least one line to said first cylinder and having a second piston slideable therein for moving the valve, the diameter of said first cylinder being larger than the diameter of said second cylinder, said first and said second cylinder and said at least one line forming a closed system, a first electromagnet excitable in accordance with operating parameters of the combustion engine, and armature means connected to said first piston and pullable by said first electromagnet for electrically generating and electrically controlling force for moving the valve.