Patent ID: 7980211

Claim:
Cam follower for a variable actuation of at least one gas-exchange valve of an internal combustion engine, comprising: a roller axle; a roller, which is mounted so as to be movable in a roller bore relative to the roller axle between a first axial position and a second axial position and which alternately transmits elevations, which are different from one another, of two cams which are arranged adjacently on a camshaft to the gas-exchange valve; a cylinder-piston unit, which forms a pressure medium space, for moving the roller from the first axial position into the second axial position; and a spring means for moving the roller from the second axial position into the first axial position, wherein a piston of the cylinder-piston unit is the roller itself, with the roller having an end wall, which delimits the pressure medium space, and an annular collar which extends from the end wall and whose outer lateral surface serves as a cam pick-off surface and whose inner lateral surface surrounds an outer lateral surface of an outer section of a cylinder of the cylinder-piston unit in a low-leakage or pressure-medium-tight manner, and wherein the cam follower is a lever which is pivotably mounted in the internal combustion engine and which has side walls which run spaced apart from one another, with the cylinder-piston unit and the spring means being arranged entirely between the side walls.