Patent ID: 6415751
Filing Date: 2002-07-09
Classification: F01L

Abstract:
Gas exchange valve control assembly for internal combustion engines with an electromagnetic actuator equipped with gas springs, comprising:an armature drive-connected to a gas exchange valve, and arranged to oscillate between stroke-separated switching magnets against reset forces of gas springs, and gas springs, being separated by the armature which serves as the separating piston, said gas springs serving to adjust adapted spring characteristics by gas metering valves and gas outlet valves which are controlled as a function of load areas of an internal combustion engine, said gas springs also serving to damp a stop of the armature on a respective switching magnet, wherein the armature is designed so as to separate the gas springs without any sliding seal, wherein, in a respective holding position on a switching magnet, the armature defines a damping chamber by means of an intercalated elastomeric element, wherein each switching magnet exhibits a coil in a laminated core which is centrosymmetrical relative to a guide shaft of the armature of the gas exchange valve, wherein each core is designed on an outer periphery flush with a coil, arranged in a peripheral groove bordering the armature-sided face, so as to rest planarly against a yoke which encloses the switching magnets including an armature stroke space, and wherein said yoke carries essentially in the center between the switching magnets a mechanism which brings about an increased acceleration force at the armature in the respective holding position.