Valve train assembly of an internal combustion engine

摘要

A rocker arm assembly for a valve train includes an hydraulic lash adjuster (6) for accommodating slack in the valve train. There is also a lost-motion connection (20,22) preferably between the axle (16) of a roller (14) which is operated upon by a cam (18) and the rocker arm (4) itself. Excessive expansion of the lash adjuster (6) will not prevent closing of the valve because the closing movement is accommodated by the lost-motion connection (20,22). A spring (22) is provided to maintain the lost-motion connection (20,22) despite the tendency of the hydraulic lash adjuster (6) to expand. Greater tolerance in the cam base circle radius is allowed, permitting the use of net-shaped cams. <IMAGE> <IMAGE>