| 摘要 |
<p>This 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 valve actuation mechanism of each cylinder belonging to a housing (E1) of the engine (E), via an engine brake activation piston (95), housed in a bore (94) of the rocker (9), and movable with respect to the rocker (9) under action of a fluid pressure raise in a chamber (101) fluidly linked to the bore (96), from a first position, in which an engine brake function is deactivated, to a second position, in which a roller (93) of the rocker (9) reads at least one engine brake bump of a cam (22) of the camshaft (2) so as to perform the engine brake function, each rocker (9) comprising a discharge valve (99) movable in translation with respect to the rocker (9), adapted to reduce fluid pressure in the chamber (101), wherein the engine brake system (S) comprises, for each rocker (9), a stopper (13) fast with the housing (E1) and adapted to exert, on a portion (961) of the piston (95), a force (F13) for opening the discharge valve (99) when the activation piston (95) has to be moved from its second position to its first position.</p> |
