Direct driven valve operating system for an internal combustion engine

摘要

The present invention relates to a direct driven valve operating system. It comprises a valve lifter (13) composed by an outer pad (14) and disposed under pressure of a camshaft (11) in the outer face of the cover portion (13b) of the cylindrical lifter body (13) of light alloy, and a tip member (16) against which one end of a valve shaft (6a) is abuted and which rests in a mounting hole formed on the inside of said cover portion (13b), and in which valve lifter (13) said mounting hole and tip member (16) are circular-shaped and said tip member (16) is stuck to the cover portion (13b) by subjecting the peripheral edge portion of said mounting hole to plastic flow within a groove formed on the peripheral wall of said tip member (16).