Engine valve assembly for an internal-combustion engine, including an electromagnetic actuator

摘要

An engine valve assembly for an internal-combustion engine includes an engine valve having open and closed positions and a first oscillating mass; a closing spring connected to the valve for urging it into its closed position. The assembly has an electromagnetic actuator which operates the valve and which includes a first and a second electromagnet having respective first and second pole faces oriented toward one another and defining a space therebetween; an armature movable back and forth in the space between the first and second pole faces; and a guide bar affixed to the armature. The guide bar has an end oriented toward the valve and defining therewith a valve clearance when the valve is in its closed position and the armature is in contact with one of the electromagnets. The armature and the guide bar together have a second oscillating mass which is at least twice the first oscillating mass. The assembly further has an opening spring connected to the guide bar for urging the armature and the guide bar toward the valve.