Abstract: A valve train of a combustion piston engine having an actuating device which comprises a phase shift gearbox with two inputs and an output for phase adjustment of a camshaft. The first input is connected with a crankshaft, the second input is connected with a controllable braking device and the output is rotationally fixed with the camshaft. The brake is an electromagnetically controlled friction brake which comprises an electromagnet and magnetic coil. A brake rotor is connected with the second input and can be biased, by the magnetic field of the electromagnet, against a friction surface. A permanent magnet is positioned axially adjacent the brake rotor such that, by its magnetic field, the brake rotor can be pressed against a fixed friction surface for the adjustment of a basic brake torque with the respective basic pressing force.

Abstract: A valve train of a combustion piston engine having an actuating device which comprises a phase shift gearbox with two inputs and an output for phase adjustment of a camshaft. The first input is connected with a crankshaft, the second input is connected with a controllable braking device and the output is rotationally fixed with the camshaft. The brake is an electromagnetically controlled friction brake which comprises an electromagnet and magnetic coil. A brake rotor is connected with the second input and can be biased, by the magnetic field of the electromagnet, against a friction surface. A permanent magnet is positioned axially adjacent the brake rotor such that, by its magnetic field, the brake rotor can be pressed against a fixed friction surface for the adjustment of a basic brake torque with the respective basic pressing force.

Abstract: A clutch or brake with an electrically actuated switching coil and an armature that axially moves toward the switching coil and forms a connection with the switching coil and can rotate relative to the switching coil, in an adjustment system for camshafts of a combustion engine. A superposition transmission has an input driven by a crankshaft of the engine, a drive output element that drives a camshaft of the engine and a control element, by which relative rotation between the input and the output can be produced by applying a braking torque. The armature is rotationally fixed and axially slidable, and centered on or at a transmission component, and the switching coil is rotationally fixed and centered coaxially with the armature by a membrane spring on a further transmission component, relative to which the armature is braked or to which the armature is coupled.

Abstract: A clutch or brake with an electrically actuated switching coil and an armature that axially moves toward the switching coil and forms a connection with the switching coil and can rotate relative to the switching coil, in an adjustment system for camshafts of a combustion engine. A superposition transmission has an input driven by a crankshaft of the engine, a drive output element that drives a camshaft of the engine and a control element, by which relative rotation between the input and the output can be produced by applying a braking torque. The armature is rotationally fixed and axially slidable, and centered on or at a transmission component, and the switching coil is rotationally fixed and centered coaxially with the armature by a membrane spring on a further transmission component, relative to which the armature is braked or to which the armature is coupled.