Patent ID: 7467610
Filing Date: 2008-12-23
Classification: F01L

Abstract:
1. A valve-operating system for an internal combustion engine, comprising cam followers which have cam abutment portions abutting against valve-operating cams provided on a camshaft and which are swingably carried in an engine body and operatively connected to engine valves biased in a closing direction by a valve spring, the cam followers being biased in a direction of abutment of the cam abutment portions against the valve-operating cams by resilient biasing means different from the valve spring, wherein each of the resilient biasing means comprises: a pull rod connected at one end thereof to the cam follower; and a compression coil spring interposed between the other end of the pull rod and the engine body to pull the pull rod to bias the cam followers in a direction of abutment of the cam abutment portions against the valve-operating cams, wherein a pair of link arms are each connected at one end thereof to the cam follower, wherein the other end of one of the link arms is turnably carried in the engine body through a stationary support shaft having an axis parallel to an axis about which the cam follower is swung, and wherein the other end of the other link arm is turnably carried by a movable support shaft which has an axis parallel to the stationary support shaft and which is movable within a plane perpendicular to the axis; and the resiliently biasing means are mounted between the one link arm and the engine body.