Valve drive apparatus for double overhead camshaft engine

摘要

A valve drive apparatus comprises a pair of valve trains, each having a rocker arm and a hydraulic lash adjuster, arranged symmetrically with respect to a center axis of each cylinder of a double overhead camshaft engine. Either one of the pair of valve trains that has a rocker arm leverage greater than a rocker arm leverage of the other of the pair of valve trains is adapted and designed so as to have a structural rigidity higher than the structural rigidity of the other.