Patent ID: 7669564
Filing Date: 2010-03-02
Classification: F01L,Y10T

Abstract:
1. A variable valve lift internal combustion engine, comprising: an engine valve; a camshaft mounted on a cylinder head of the engine and including a cam lobe; a rocker arm pivotally supported by the cylinder head and including a first part that engages a valve stem of the engine valve; a control shaft pivotally supported by the cylinder head via a pivot arm pivotally supported by the cylinder head so as to able to move angularly around a rotational center line extending in parallel with an axial line of the control shaft, wherein the base end of the pivot arm is pivotally supported by a cam holder, and wherein the base end of the pivot arm is further pivotally supported by a pivot pin which is passed partly into a journal bore of the cam holder, the cam holder including an oil hole for supplying lubricating oil to the journal bore; a power transmitting member supported by the control shaft; an actuator for causing an angular movement of the control shaft around the rotational center line via the power transmitting member; and a control arm having a base end pivotally supported by the control shaft and a free end interposed between the cam lobe and a second part of the rocker arm; a lift of the engine valve being varied by angularly moving the control shaft around the rotational center line and moving the base end of the control arm.