Roller rocker arm with valve bridge as integral part of the roller rocker arm

摘要

A valve control system for an engine having a pair of poppet valves (11,13), the system including a rocker arm (25) having a first end (25a), and a bridge member (43;143) in engagement therewith. A shaft member (39) fixes the lateral position of the bridge member relative to the rocker arm to define an axis (A). The bridge member cooperates with the poppet valves to define first and second contact points (CP5, CP6). As the rocker arm engages in pivotal movement, the lateral distances from the axis (A) to the contact points (CP5,CP6) remain substantially constant and equal, thus insuring that the forces transmitted to the poppet valves by the bridge member remain substantially constant and equal, and further insuring that the valve velocity curves of the two valves will conform to the "desired" valve velocity (Vo).