Poppet valve stroke adjusting device for, and combination with, an

Abstract

A power driven valve stroke adjusting device, remotely controlled, is operable for adjusting the length of stroke of a spring returned poppet valve of a valve-in-head internal combustion engine in which the valve is driven by an associated valve operating rocker on the head, operated by a push rod which, in turn, is driven by a tappet which is lineally reciprocable axially and concurrently rotatable about its axis. The device is carried on the rocker and is operable to adjust the valve stroke for opening the valve by the rocker from starting position of the valve to a long-stroke open position or to a short-stroke open position, selectively. The adjustment is effected during engine operation and without any hindrance to tappet rotation and without any change in the timing relation between the tappet and its operating cam, all while maintaining a zero or fixed preselected clearance between the rod and the rocker and between the rod and the tappet in the starting position of the valve. The device can be installed on a conventional engine, to provide therewith an operating combination, by replacing the existing rocker, with a rocker on which the device is installed. A plurality of the devices, one for each valve, or one for each of a selected group of valves, may be provided for a multi-valve engine, and may be adjusted in unison to like operating positions from a single remote control source.