Inventors:
Louis A. Hausknecht - Cleveland OH
International Classification:
F01L 124
Abstract:
A variable valve control system includes sensors for sensing internal combustion engine operating variables such as carburetor vacuum, intake manifold vacuum, etc. , and translating such variables to control a piston in a hydraulic valve control mechanism so as to ultimately vary the valve action. The piston is positioned so as to control the hydraulic pressure acting on the top of an operating sleeve which, in turn, controls upward movement of a fulcrum to control rocker arm movement and, thereby, the opening of the combustion chamber intake valve. The system includes a pivotable rocker arm, one end of which is operatively connected to the camshaft by a cam follower and push rod and the other end of which is operatively connected to the intake valve. Variably positioning the hydraulic piston, and thereby the sleeve which acts on the fulcrum, controls the movement of the rocker arm. The invention also includes an air bleed and pressure relief in the line leading from the piston to the hydraulic pressure system which is sensitive to oil viscosity and prevents local back pressure build-up in cold weather.