Patent ID: 6382150
Filing Date: 2002-05-07
Classification: F01L

Abstract:
Valve actuating mechanism comprising:opening and closing rotary cams rotatable together about a primary axis; and a rocker pivotable about a first pivot axis spaced from the primary axis, the rocker being connectable to actuate a valve by oscillating motion about the pivot axis and having first and second rocker arms respectively carrying opening and closing cam followers spaced from the pivot axis, the cam followers operatively engaging the opening and closing rotary cams respectively and operable by the cams for positively oscillating the rocker in either direction about the first pivot axis; said closing cam follower having a pad engagable with the closing cam and carried by a hydraulic lash control piston slidable in a cylinder of the second rocker arm, the cylinder connected with a pressure oil supply including a check valve preventing reverse flow of oil toward the oil supply, and a bleed orifice in the pad and sized to allow restricted outflow of oil from the cylinder to avoid excessive loading of opening and closing portions of the mechanism, the piston being advanced by the oil pressure to take up lash occurring between the cams and cam followers.