VALVE MOVING DEVICE FOR ENGINE

摘要

When a shift-down mistake of a manual speed changer or other reason causes an increase in engine speed that may exceed an allowable speed, a valve moving device for an engine with a valve lift varying mechanism reduces a lift amount without changing an opening angle of a valve (19). A curvature of the vertex of a lift curve of the valve (19) is made smaller to reduce inertia force acting on the valve (19), so that irregular motion of the valve (19) can be prevented. Further, an increase in an intake air volume is prevented by the reduced lift amount of the valve (19) and engine brake is prevented from becoming ineffective, which reduce engine speed to prevent promotion of irregular motion.