VALVE DRIVE FOR GAS EXCHANGE VALVES OF AN INTERNAL COMBUSTION ENGINE HAVING A MAIN CAMSHAFT AND CAM CARRIERS WHICH CAN BE DISPLACED BETWEEN ROTARY BEARINGS OF THE MAIN CAMSHAFT INTO TWO OR MORE DISCRETE DISPLACEMENT POSITIONS

摘要

The invention relates to a valve drive (1) for gas exchange valves (2) of an internal combustion engine, having at least one main camshaft (4), having at least one cam carrier (5) which is axially displaceable on the main camshaft (4) and which comprises at least one cam group (6, 7) with at least three cams (13, 14, 15) with different cam profiles, having devices (21, 22, 23, 24, 25) for the axial displacement of the cam carrier (5) on the main camshaft (4) into a number of discrete displacement positions corresponding to the number of cams (13, 14, 15) of the cam group (6, 7), and having a locking device (26) with a spring-loaded ball (28) for locking the cam carrier (5) in the discrete displacement positions. In order inter alia to reduce the required installation space, it is proposed according to the invention that the main camshaft (4) is mounted at both sides of the cam carrier (5) in a positionally fixed rotary bearing (3), and that the spring-loaded ball (28) of the locking device (26) is arranged in a recess (27) of the main camshaft (4) and pushes the cam carrier (5), in two outer displacement positions, in each case against a positionally fixed axial stop (3, 18).