FIELD: engine engineering. SUBSTANCE: engine has cylinder piston 2 and adjusting piston 5 mounted coaxially in the cylinder. Piston 2 is kinematically coupled with a connecting rod, and piston 5 is coupled with mechanism 6 for its locking mounted in the cylinder head. Ring recess 7 of triangle cross- section is made in the inner side of the cylinder. The outer periphery of ring spring 4 is rigidly secured to the top of triangle recess 7. The inner periphery of the ring spring is connected with adjusting piston 5. The width of piston 5 is grater the maximum width of recess 7. A splitter can be mounted on working side 8 of piston 5. EFFECT: enhanced efficiency. 2 dwg
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