Patent ID: 8534250

Claim:
A valve actuation system for actuating a valve, said valve actuation system comprising: a valve lash; a rocker shaft assembly rotatable about a fixed axis and operable to adjust the valve lash, the rocker shaft assembly including a rocker bearing portion which provides a movable axis offset from the fixed axis and support for a rocker; a rocker shaft lever secured the rocker shaft assembly so that a rotational position of the rocker shaft assembly is operable to be determined by a rotational position of the rocker shaft lever; and a lash adjuster assembly, which is operable to exert a force on the rocker shaft lever so as to adjust the rotational position of the rocker shaft lever; wherein the valve actuation system is configured such that a resulting movement of the moveable axis relative to the fixed axis reduces the valve lash, and wherein a lever ratio defined as a ratio of (1) a shortest distance between a line of action of a force applied to the lash adjuster assembly by the rocker shaft lever and the fixed axis to (2) a shortest distance between a line of action of a force applied to the rocker shaft assembly by the rocker and the fixed axis is 10:1, thereby reducing a force from the rocker onto the lash adjuster assembly and increasing the effective stiffness of the lash adjuster assembly.