Patent ID: 8596237

Claim:
An internal combustion piston engine comprising a crank drive, at least one cylinder head whose inlet and outlet channels are each governed by at least one gas exchange valve, formed as intake and exhaust valves, said valves being actuated by cams of at least one camshaft and by transmitting elements driven by said cams, the cams being fashioned as sliding cam units having at least two cams per sliding cam unit which are situated on a basic shaft in rotationally fixed fashion but so as to be capable of being displaced axially on said basic shaft, said basic shaft being mounted so as to be fixed axially relative to the internal combustion engine, and having at least one actuator unit, fixed relative to the internal combustion engine, having two actuator pins for displacing the sliding cam units into different axial positions using at least two displacement grooves on a circumference of the sliding cam unit that work together with the actuator pins, said grooves being made helical and situated mirror-symmetrically to one another, and having at least one ejection ramp for the actuator pins, the actuator pins being spring-loaded in a direction toward the sliding cam unit and, in a retracted position facing away from the sliding cam unit, being fixed by arresting devices, the arresting devices having control needles that correspond to clamping bodies of the locking devices, said control needles being actuated by an electromagnet unit, the control needles stand in operative connection with a needle bridge, and a pin engages on the needle bridge, said pin being controlled by the electromagnet unit.