| 摘要 |
A valve control system (13) for an internal combustion engine including a cylinder head (11), and a poppet valve (15). A camshaft (21) has a first cam profile (25) and a second cam profile (27), and a rocker arm assembly (29) includes a first cam follower (49) and a second cam follower (61) engageable with the second cam profile (27). The poppet valve (15) is disposed toward a first axial end of said rocker arm assembly (29), and there is a first fulcrum surface (39) toward a second axial end of the rocker arm assembly. The first and second axial ends of the rocker arm assembly are oppositely disposed about the first (49) and second (61) cam followers, and a first lash compensation device (83) is operably associated with the cylinder head and includes a first plunger (97) in engagement with the first fulcrum surface (39). The valve control system (13) is characterized by the rocker arm assembly (29) defining a second fulcrum surface (59) disposed axially between the first fulcrum surface (39) and the cam followers (49,61). A second lash compensation device (85) is operably associated with the cylinder head and includes a second plunger (99) in engagement with the second fulcrum surface (59) of the rocker arm assembly (29). Each of the first (83) and second (85) lash compensation devices is selectively switchable between a latched condition (FIG. 1) and an unlatched condition.
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