GB124034A - Improvements in Internal Combustion Engines. - Google Patents

Abstract

124,034. Bateman, F. March 11, 1918. Two - stroke - cycle engines; driving-gear. -An engine having terminal exhaust ports is charged with combustible mixture which enters through an automatic valve located in a supplementary piston carried by a pump piston which reciprocates in a chamber adjacent the cylinder head. In the construction shown in Fig. 1, a pump piston 6 which reciprocates in a chamber 2 is secured to a supplementary piston 8 having an inlet valve 15 through which combustible mixture enters the cylinder 1 during the downstrokes of the pump piston 6. Combustible mixture is drawn in below the pump piston through a passage 3. When the pistons in the cylinder head are raised by the explosion pressure in the working cylinders 1. The return strokes of the pistons are effected by a spring 22, the normal pressure on which may be adjusted by a screw 21. Ports 12, 13 place the underside of the pump in communication with the space above the valve 15. A modification is described in which the charges are compressed above a pump piston actuated by cams on the crank-shaft. If preferred, the downstrokes of the pump piston may be effected by mechanical means and the upstrokes by a spring. According to the Provisional Specification, the working piston may reciprocate in a sleeve carried by the auxiliary piston, the sleeve having two sets of exhaust ports. Means other than valves in the pistons may be provided for transferring the pump charges to the combustion spaces, and the auxiliary spaces may be actuated by overhead shafts carrying tubular members, secured to eccentrics, for transferring the pump charges to the cylinders.