Patent ID: 8707918

Claim:
A valve train of a combustion piston engine, having an actuating device ( 1 ), comprising: a phase shift gearset ( 3 ) with first and second input elements ( 4 , 5 ) and an output element ( 6 ) for a phase adjustment of a camshaft ( 2 ), the first input element ( 4 ) being drivingly connected with a crankshaft, the second input element ( 5 ) being operatively connected with a controllable braking device ( 7 ), and the output element ( 6 ) being connected, in a rotationally fixed manner, with the camshaft ( 2 ), the braking device ( 7 ) being an electromagnetically controllable friction brake ( 15 ) comprising an enclosure-mounted electromagnet ( 16 ), a magnetic coil ( 18 ), and brake rotor ( 21 ) that is rotationally fixed and axially shiftably connected with the second input element ( 5 ), and which is pressed by a magnetic field of the electromagnet ( 16 ) against an enclosure-mounted friction surface ( 22 ), and a permanent magnet ( 23 , 23 ′) being positioned axially adjacent the brake rotor ( 21 ) such that a magnetic field permanent magnet ( 23 , 23 ′) biasing the brake rotor ( 21 ) for adjustment of a basic brake torque, with a respective basic pressing force, against the enclosure-mounted friction surface ( 22 ).