Abstract: The invention relates to valve control for an internal combustion engine. The valve control includes a valve, a first camshaft having a first cam member and a second cam member having a different profile from the first cam member and a cam follower assembly for transmitting reciprocating movement to the valve from the cam. The cam follower assembly includes a first cam follower member in engagement with the valve and a second cam follower member movably relative to the first cam follower member, and locking means to enable the follower members to be linked to move together. When the follower members are not linked the valve means is controlled by the first cam follower member in engagement with and following the profile of the first cam member and when the follower members are linked the valve is controlled by the second cam follower member in engagement with and following the profile of the second cam member. One of the cam members having a circular axial cross-section to enable valve deactivation.

Abstract: The valve control means for an internal combustion engine comprises valve means (10), cam means comprising a camshaft (30) having a first cam member (23) and a second cam member (26) having a different profile from the first cam member (23) and means (18) for transmitting reciprocating movement to the valve means (10) from the cam means (23 or 26). The means (18) for transmitting reciprocating movement comprises a first cam follower member (20) in engagement with the valve means (10) and a second cam follower member (21) movable relative to the first cam follower member (20), and locking means (27) to enable the follower members (20 and 21) to be linked to move together.