ENGINE VALVE SYSTEM WITH VARIABLE LIFT AND DURATION

摘要

An improvement is disclosed for an engine valve system of the type comprising two cams mounted coaxially, a summation rocker (14) coupled to cam followers (16, 18) in contact with both cams and movable in proportion to the instantaneous sum of the lifts of the respective cams, and a valve actuating rocker (20) pivotably coupled to the summation rocker (14) and serving to open an engine valve in dependence upon the movement of the summation rocker. In the invention, at least one of the couplings of the summation rocker with the cam followers (16, 18) and with the valve actuating rocker (20) incorporates an adjustable eccentric which is rotatable to enable the clearance within the valve system to be set.