Patent ID: 7878165

Claim:
An engine valve operating system in which a camshaft is supported via a bearing on a cylinder head having an intake valve and an exhaust valve provided therein, and an intake rocker arm and an exhaust rocker arm are mounted on a rocker arm shaft supported on the cylinder head so as to be parallel to the camshaft, the intake rocker arm and the exhaust rocker arm respectively providing a connection between the camshaft and the intake valve and between the camshaft and the exhaust valve, wherein a fixing bolt as a fixing member is secured to the cylinder head such that the fixing bolt extends parallel to the camshaft and abuts against an end part of the rocker arm shaft and restricts movement thereof in a thrust direction, and a flange seat formed on a head part of the fixing bolt as a restraining portion abuts against one side face of the bearing and restricts movement thereof in a thrust direction.