FIELD: mechanical engineering; engines; gas exchange in two-stroke engines. SUBSTANCE: engine has cylinder with fitted in piston, intake ports in cylinder lower portion, exhaust port in cylinder upper portion. Piston is made stepped, its larger diameter portion being connected with crank and overlaps in take ports and smaller diameter portion is made in form of spool and overlaps exhaust port in upper portion of which holes are made in form of steps Exhaust port in upper portion of cylinder is made in form of sleeve installed coaxially with spool and serves as guide for spool. EFFECT: simplified design of engine with loop scavenging, enhanced scavenging and filling of cylinder and more full utilization of cylinder working volume. 1 dwg
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