Patent ID: 7779797
Filing Date: 2010-08-24
Classification: F01L

Abstract:
1. An engine valve operating system comprising a camshaft ( 22 ) having a valve operating cam ( 21 ) provided thereon, a first rocker arm ( 23 ) that can swing around a first axis (C 1 ) parallel to an axis of the camshaft ( 22 ), a roller ( 25 ) that is axially supported, via a roller shaft ( 24 ), on a roller support portion ( 38 ) provided on the first rocker arm ( 23 ) and that is in rolling contact with the valve operating cam ( 21 ), and a second rocker arm ( 26 A, 26 B, 64 ) that has a sliding surface ( 48 A, 48 B, 68 ) in sliding contact with the roller shaft ( 24 ), is operatively connected to an engine valve (V 1 , V 2 ), and can swing around a second axis (C 2 ) parallel to the first axis (C 1 ), the position of either one of the first and second axes (C 1 , C 2 ) changing within a plane perpendicular to the axis of the camshaft ( 22 ), characterized in that at least the roller support portion ( 38 ) of the first rocker arm ( 23 ) is disposed at a position that overlaps the second rocker arm ( 26 A, 26 B, 64 ) in plan view.