Abstract: In a cylinder-head-mounted camshaft bearing structure for an internal combustion engine in which the camshaft bearings are mounted on the cylinder head by bearing caps arranged in spaced relationship from one another and the bearing caps have aligned mounting holes receiving rocker-arm support shafts for pivotally supporting the rocker arms between said bearing caps and the bearing caps are further interconnected by longitudinal webs so as to form an integral frame-like bridge unit, transverse webs are disposed between said caps in spaced relationship therefrom and interconnect the longitudinal webs so as to define between the transverse webs and between the webs and the adjacent bearing caps spaces receiving the rocker arms.

Abstract: In a valve operating system for an internal combustion engine with overhead valves and a camshaft supported by a bearing bracket mounted on the cylinder head for the actuation of the valves via a rocker arm arrangement comprising for at least one of the valves a main rocker arm and adjacent thereto an auxiliary rocker arm adapted to be coupled to the main rocker arm for superimposing its movement as controlled by its associated cam structure onto the main rocker arm which operates the associated valve, a spring supporting element which engages the auxiliary rocker arm so as to maintain it in contact with the associated cam structure engages with its one end the auxiliary rocker arm and is supported with its other end on said bearing bracket.