Electromagnetic control device for use as cam adjuster for piston engine, has guide cylinder's inner space enlarged in length region associated to position occupied by magnet such that magnetic shunt-air gap is formed for magnetic flux

摘要

The device has rod-like plungers (1, 3) axially movable between retracted and extended switching positions. A permanent magnet (51) holds the plungers against pretensioning force in the retracted switching position by energizing magnetic force between pole bodies (25, 27) and pole cores (13, 15). The pole bodies are movable in a guide cylinder (53) forming magnetic shunt. An inner space of the cylinder is enlarged in a length region (55) associated to a position occupied by the magnet in the retracted switching position such that a magnetic shunt-air gap (57) is formed for magnetic flux.