Switchable valve drive for combustion engine - uses balls as driver elements to maintain contact with single cam between pair of cams

摘要

Switchable valve drive in which the tappet element (13) is mounted as part of a surface or roller tappet (3) in engagement with the cam (10). The tappet driver arrangement (15) has switchable drivers (16), preferably balls, which during the passage of the circumference of the cam base (NGK) are brought into engagement between the tappet element and the surface or roller tappet. The tappet element penetrates the surface tappet and remains in constant contact with the cam (11) when the driver mechanism is inactive. ADVANTAGE - Has a mechanical driver arrangement which is hydraulically switchable.