System Description: Description

The system comprises a carrier shaft with cam pieces which can be shifted axially, as well as an electromagnetically actuated lift solenoid with two tappets which enable a forward and backward movement. A position sensor element monitors the positions of the tappets. The cam pieces are displaced by a tappet entering the curved path of the cam piece. The shape of the curved track causes a lateral force to be exerted on the cam piece so that the cam piece is moved axially. The second plunger of the lift solenoid is responsible for the backward movement. The plungers are engaged only during the respective adjustment operation. An elevation in the curved track causes the tappet to return to its default position. The cam piece is set to its basic position mechanically by the shape of the curved track. The mechanical lift adjustment is effective up to an engine speed of 4, 000 RPM.