Variable valve train of an internal combustion piston engine

The invention relates to a variable valve train (1) of an internal combustion piston engine with at least one gas exchange valve per cylinder, the valve lift by a respective primary and secondary cams (7, 8) is predetermined and a switchable drag lever (10) is transferred to the gas exchange valve, each primary lever (12) between its ends with the primary cam (7) and each secondary lever (16) with the associated secondary cam (8) in Abgriffkontakt and by means of a coupling element (15) is coupled to the primary lever (12), wherein the coupling element (15) into a transverse bore (14) of the primary lever (12) guided coupling bolt which is mounted by means of an in a transverse bore (21) of the secondary lever (16) locking bolt (22) in a coupling bore (28) of the secondary lever (16) and by means of an in out of the coupling hole (28) of the secondary lever (16) Entriegelungsbolzens (25) back into the transverse bore (14) of the primary lever (12) vers is chiebbar, wherein the locking and unlocking (22, 25) each with its axially outer end (23, 26) project out of the secondary lever (16) and mounted via a respective at this end (23, 26) connecting element (29, 30 ) (with a shift rod 35) are coupled, arranged which switching rod (35) (parallel to the associated camshaft 6) as well as (by means of a linear actuator 32), (against the restoring force of a spring element 37) (from a rest position 43) into a switching position (45 ) is longitudinally.