Patent ID: 9305693
Filing Date: 2016-04-05
CPC Classification: F01L,H01F

Claim Text:
1. A camshaft adjustment device comprising a cam of an internal combustion engine, the cam has a control groove, and a bistable electromagnetic actuating device ( 1 ) with an actuating element ( 2 ) having an engagement region ( 4 ) at the end side and axially movable between two end positions for engagement into the control groove of the cam, a coil apparatus ( 11 ) provided stationarily relatively to the actuating element ( 2 ) and constructed for exerting a force onto the actuating element, the actuating element ( 2 ) has permanent magnet means ( 5 ), which are constructed for interacting with a core region ( 3 ) provided stationarily relatively to the actuating element ( 2 ), the coil apparatus ( 11 ) is constructed for generating a counter force counteracting a retaining force of the permanent magnet means ( 5 ) and releasing the permanent magnet means from the core region ( 3 ) as a reaction to an electronic control signal, spring means ( 14 ) are provided and arranged such that they load the actuating element ( 2 ) with spring force in an axial direction pointing away from the core region ( 3 ), the permanent magnet means ( 5 ) have at least one axially magnetised permanent magnet ( 6 ) and a pole disc ( 7 ) made from magnetically conductive material on the side facing the core region ( 3 ) and comprise a pole disc ( 7 ) made from magnetically conductive material and facing away from the core region ( 3 ), and the actuating element ( 2 ) is adjusted into an end position by powering the coil apparatus ( 11 ), wherein, when in the end position, the actuating element engages by means of the engagement region ( 4 ) thereof into the control groove and is accelerated by the cam by means of the rotation thereof in the direction of a core-region-sided initial position of travel, wherein the spring means ( 14 ) are maximally prestressed by means of the actuating element ( 2 ), and wherein the core region ( 3 ) and the pole disc ( 7 ) of the permanent magnet means ( 5 ), on the side facing the core region, overlap in the core-region-sided initial position of travel in the axial direction for influencing the return point.