Engine valve control system using a latchable rocker arm

摘要

A valve control system for an internal combustion engine. The system includes an outer rocker arm which is engageable with an engine poppet valve, and an inner rocker arm which is engageable with a cam lobe formed in an engine camshaft and a slidable latch member which mechanically links and unlinks the inner and outer rocker arms. The latch member is axially moveable relative to the inner and outer rocker arms between an active position wherein the inner rocker arm engages the outer rocker arm to transmit a valve opening force from the camshaft to the poppet valve, and an inactive position wherein the inner and outer rocker arms are out of engagement and free to rotate relative to one another. The system is adapted for use in a valve train wherein the engine poppet valve remains closed when the inner and outer rocker arms are unlinked when the latch member is in an inactive position and wherein the engine poppet valve opens and closes in response to the cam lobe when the inner and outer rocker arms are linked together when the latch member is in an active position. An actuator operates a bellcrank mechanism which contacts the latch mechanism to move the latch mechanism to an active and an inactive position.