Patent ID: 6347607
Filing Date: 2002-02-19
Classification: F01L,Y10T

Abstract:
A valve operating system in an internal combustion engine, comprising an associative-operation switchover means which is provided between a plurality of rocker arms and which includes a switchover pin provided astride between adjacent ones of said rocker arms and movable between an associatively operating position where said adjacent rocker arms are operated in association with each other and an associative-operation releasing position where the switchover pin is separated from one of said adjacent rocker arms to release the associative operation, one of the adjacent rocker arms being provided with first and second support walls with said second support wall disposed on the side of the other rocker arm, a roller disposed between said first and second support walls to come into rolling contact with a cam provided on a camshaft, and a cylindrical roller shaft provided between said first and second support walls with a roller rotatably carried thereon, so that said switchover pin can be slidably fitted into said roller shaft in accordance with the movement thereof to said associatively operating position, wherein said roller shaft is press-fitted into at least second one of said first and second support walls, and a press-fit margin for the roller shaft press-fitted into the second support wall on the side of the other rocker arm is set smaller than a press-fit margin for the roller shaft press-fitted into the second support wall on the side of the roller.