Fully variable mechanical valve gear for a piston-type internal combustion engine

A variably adjustable mechanical valve gear for at least one gas-reversing valve (1) with a closing spring (2) on a piston engine, in particular a piston-type internal combustion engine, comprising a driving mechanism (13) for generating a lifting movement that is effective counter to the force of the closing spring (2) on the gas-reversing valve (1) and a stroke transfer means (13) arranged between the driving mechanism (13) and the gas-reversing valve (1), which acts upon the gas-reversing valve (1) in the direction of its movement axis (14) and for which the stroke distance can be adjusted in the direction of the movement axis (14) via an adjustable guide element (11) and which is realized with a pivoting element (8) that is connected with its end facing away from the gas-reversing valve (1) to the driving mechanism (13) and is guided so as to pivot back and forth on the guide element (11) designed as control curve (11.1) and which is positioned on a locally fixed guide with the end acting upon the gas-reversing valve (1) in the direction of the movement axis (14) of the gas-reversing valve.