Bistable electromagnetic actuating apparatus, armature assembly and camshaft adjustment apparatus

摘要

A bistable electromagnetic actuating apparatus (1) having an actuating element (2), which forms an engagement region (4) at the end and can be moved axially between two end positions, in particular for engaging in a control groove in a cam of an internal combustion engine, and having a coil device (11) which is provided in a stationary manner relative to the actuating element (2) and is designed to exert a force on said actuating element, wherein the actuating element (2) has permanent magnets (5) which are designed to interact with a core region (3) which is provided in a stationary manner relative to the actuating element (2), and wherein the coil device (11) is designed to generate a counterforce, which counteracts a retaining force of the permanent magnets (5) and releases said permanent magnets from the core region (3), in response to an electronic actuation signal, and wherein a spring is arranged such that it applies a spring force to the actuating element (2) in an axial direction which faces away from the core region (3).

主权项

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.