Patent ID: 6412460
Filing Date: 2002-07-02
Classification: F01L

Abstract:
A valve operating system in an internal combustion engine, comprisinga cam shaft provided with a valve operating cam, a rocker arm having a pair of support wall portions which are integrally connected at base ends thereof to a swinging support portion swingably supported on a support member mounted on a cylinder head, said support wall portions being opposed to each other at a distance in a direction along a swinging axis of said swinging support portion, a support shaft supported between said support wall portions, and a roller which is rotatably supported on said support shaft with a bearing interposed therebetween, said roller being in rolling contact with said valve operating cam, wherein said swinging support portion has a surface portion opposed to said roller and extending between said pair of support wall portions, and a lower connecting wall interconnecting lower portions of the base ends of said support wall portions is projectingly provided on said surface portion of said swinging support portion so as to be opposed to an outer peripheral surface of said roller, said lower connecting wall being closest to said outer peripheral surface of the roller in said surface portion.