Patent ID: 8181616

Claim:
An internal combustion piston engine comprising at least one cylinder, inlet and outlet channels of said cylinder head being regulated, each one, by at least one inlet and outlet valve that is loaded by a closing spring, said inlet and outlet valves being activated by roller tappets driven by cams of a camshaft and, optionally, by further transmissions elements, said roller tappets comprising at ends oriented away from rollers of the roller tappets, two flattened portions that are arranged substantially parallel to each other while being operatively connected to two matching inner surfaces of an anti-rotation bridge made of plastic, and a spacing dimension of said flattened portions at least partially overlapping a distance between said inner surfaces, wherein, starting from a mounting position of the roller tappet in the anti-rotation bridge, an adjustment between the flattened portions of the roller tappets and the inner surfaces of the anti-rotation bridge is varied with a tendency to adjustment with lash in direction of an operating position of the roller tappet, wherein the flattened portions comprise respectively an end region oriented away from the roller and a region adjacent to the roller and in the end region of the roller tappet oriented away from the roller, a spacing between the flattened portions is larger than in the region adjacent the roller.