Abstract: In a cylinder head with desmodromic valve operation for internal combustion engines, where the operation is implemented by two rockers for each valve which control its closure and opening respectively and which act on the valve stem by way of calibrated registers.The rocker for opening the valve is mounted with two degrees of freedom on its pin. One of these degrees of freedom relates to its ability to rotate about the pin and the other to its ability to translate along the pin. By utilizing this second degree of freedom, the rocker can be moved onto and off the valve.

Abstract: A four-valve cylinder head for internal combustion engines, in which the valves are operated desmodromically, each by a pair of rockers, one for closing and the other for opening the respective valve, each rocker being mounted on a separate support pin, and the rockers being controlled by parallel camshafts.