Hydraulic drive for motor vehicle internal combustion engine poppet valve has variable volume chamber connected to poppet valve stem and with controlled fluid discharge

摘要

The hydraulic poppet valve (5) drive for a motor vehicle internal combustion engine has a variable volume hydraulic actuating chamber (2) to move the valve stem. The outlet flow from the chamber can be altered by a through flow valve. The through flow valve is an electrically controlled valve (1) with three switching positions, including high and low flow rates and a shut off position.