FIELD: manufacture of engines. SUBSTANCE: engine has torus working chamber with gas distributing ports and piston whose rod is connected with power takeoff shaft by means of at least three pairs of gripping levers engageable with guide member. Working chamber is provided with damper fitted at inlet, end shut-off device and telescopic compression rings located between end shut-off device and gas distributing ports. Piston is movably secured on rod by means of spring and retainer. Rod is provided with seats for engagement with gripping device; distance between seats exceeds length of working chamber. EFFECT: enhanced reliability. 3 cl, 3 dwg
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