GB119401A - Improvements in and connected with Internal Combustion Engines. - Google Patents

Abstract

119,401. Davidson, J. March 19, 1918. Valves.-A double-acting two-stroke-cycle engine with two cylinders a, a' has coaxial charging pumps g, g<1> which supply an adjacent combustion space and also the upper combustion space in another cylinder. Combustible mixture is supplied to the pump g through a passage r<1> which opens into an annular inlet chamber in a piston valve l. A portion of each compressed charge is delivered to the combustion chamber x' through ports j<1> which register with ports above a partition e, and the remainder is transferred to the combustion chamber y in the cylinder a through ports o in the tail-rod of the piston b when ports t in the valve l register with the passage r<1>. Similarly, the combustion chambers x and y<1> are charged by the pump g<1>. A singleacting engine is described in which a pump piston is carried by a tail-rod on the working piston, the charge being transferred from the pump to the combustion space through the rod. A charge of combustible mixture may be admitted to the pump through ports controlled by the tail-rod, or the admission ports may be valve-controlled. Scavenging air which may enter the cylinder in advance of the combustible mixture, is drawn unto the hollow tail-rod during the suction stroke of the pump.