ROCKER ARM ARRANGEMENT FOR DUAL VALVE TIMING WITH SINGLE CAM LOBE

摘要

A valve control system for an engine poppet valve (V) moveable between open and closed positions. A camshaft (11 ) has a cam profile including a lift portion (15), the valve control system comprising a rocker arm (19) defining a pivot location (R) about which the rocker arm pivots to move the poppet valve. The rocker arm includes a first cam follower (35) engaging the lift portion as said camshaft rotates, and is characterized by including a second cam follower (43) engaging the lift portion at approximately the same time the lift portion moves out of engagement with the first cam follower. The second cam follower is moveable between an activated position (FIG. 1 ) in which engagement with the lift portion maintains the poppet valve open, and a deactivated position (FIG. 3) in which engagement with the lift portion does not maintain the poppet valve open.