Valve drive for gas exchange valves of an internal combustion engine with a base camshaft so as to and between the pivot bearings of the base camshaft in two or more discrete displacement positions displaceable cam supports

摘要

The present invention relates to a valve gear mechanism (1) for gas exchange valves (2) of an internal combustion engine with at least one base camshaft (4), at least one on the base camshaft (4) axially displaceable cam carrier (5), the at least one cam group (6, 7) with at least three cams (13, 14, 15) with different cam profiles, means (21, 22, 23, 24, 25) for axial displacement of the cam support (5) on the base camshaft (4) in one of the number of cams (13, 14, 15) of the cams of group (6, 7) corresponding number of discrete displacement positions, as well as a locking device (26) with a spring-loaded ball (28) for locking of the cam support (5) in the discrete locking positions. , Inter alia, to reduce the size of the space requirement, it is proposed according to the invention that the base camshaft (4) on both sides of the cam support (5) in a stationary pivot bearing (3) is mounted and that the spring-loaded ball (28) of the locking device (26) in a recess (27) of the base camshaft (4) is arranged and the cam carrier (5) into two outer displacement positions in each case against a fixed axial stop (3, 18) presses.