| 摘要 |
<p>The invention proposes a valve actuation mechanism (S) for an internal combustion engine (E) on an automotive vehicle, comprising rockers (9) moved by a camshaft (2), each rocker (9) being adapted to exert a valve opening force (F9) on at least a portion of a opening actuator (7) of each cylinder, via an activation piston (95) of the rocker (9) movable with respect to the rocker (9) under action of a fluid pressure raise in a chamber (101), from a first position to a second position, in which a cam follower (93) of the rocker (9) is adapted to read at least one auxiliary valve lift sector of a cam (22) of the camshaft (2) so as to perform an engine operating function, each rocker (9) comprising a valve (97; 99; 103; 106) for releasing fluid from the chamber (101), wherein the valve actuation mechanism (S) comprises, for each rocker (9), a stopper (13) fast with a housing (E1) of the engine (E) and adapted to exert, on a member (978; 991; 95) of the rocker (9), a variable force (F136) for opening the fluid releasing valve (97; 99; 103; 105).</p> |
