Patent ID: 6125805
Filing Date: 2000-10-03
Classification: F01L

Abstract:
A valve operating system in an internal combustion engine, comprising a plurality of rocker arms disposed adjacent one another, and an associative operation switching means having a timing piston defining a hydraulic pressure chamber between said timing piston and a particular one of said rocker arms, said switching means being capable of switching the associative operation and the releasing of the associative operation of said plurality of rocker arms in accordance with the operation of said timing piston in response to a variation in hydraulic pressure in said hydraulic pressure chamber, wherein said particular rocker arm is provided with a communication passage which permits an oil passage provided in a support member for swingably supporting said particular rocker arm to communicate with said hydraulic pressure chamber, and wherein said communication passage has a cross-sectional shape with a length thereof in a direction substantially perpendicular to a direction of arrangement of said rocker arms being longer than a length thereof in a direction substantially parallel to the direction of arrangement of said rocker arms, said communication passage being provided in said particular rocker arm along a plane substantially perpendicular to the direction of arrangement of said rocker arms.