Patent ID: 8887679
Filing Date: 2014-11-18
Classification: F01L

Abstract:
1. A valve actuation mechanism for an internal combustion engine on an automotive vehicle, comprising rockers moved by a camshaft, each rocker being adapted to exert a valve opening force on at least a portion of a valve opening actuator of each cylinder belonging to a housing of the engine, via an activation piston, housed in a bore of the rocker, and movable with respect to the rocker under action of a fluid pressure raise in a chamber fluidly linked to the bore, from a first position to a second position, in which a cam follower of the rocker reads at least one auxiliary valve lift sector of a cam of the camshaft so as to perform an engine operating function, each rocker comprising a discharge valve, adapted to release fluid from the chamber when pressure in the chamber exceeds a certain level, wherein the valve actuation mechanism comprises, for each rocker, a stopper fast with the housing and adapted to exert, on a portion of the activation piston, a force for opening the discharge valve when the activation piston has to be moved from its second position to its first position.