| 摘要 |
The invention is based on an electromagnetic actuator for activating a gas exchange valve. The latter has both an opening magnet and a closing magnet, between which an armature which is connected to a valve stem is arranged in a coaxially displaceable fashion. The armature is held in a position of equilibrium between the magnets by means of an upper and a lower prestressed valve spring when the magnets are in a currentless state. In order to be able to control the actuator better, a plunger coil is connected to a valve stem of the gas exchange valve and is arranged coaxially with respect to said valve stem. Said plunger coil dips into a radially magnetized air gap of an annular, axially magnetized permanent magnet.
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