FIELD: mechanical engineering. SUBSTANCE: cylindrical housing with crown accommodates barrel and piston assembly. Piston assembly has piston with supporting shoe mounted for engagement with guide shoe linked with drive shaft cam. Shaft is installed in bearings within crankcase. Working chamber is formed between barrel, crown, and piston mounted within barrel in a spaced relation. Barrel is made of high-strength thermoplastic material based on polyester-ether ketone. Clearance between barrel and piston is used as cooling space and is large enough to afford barrel temperature not to excess 100 deg. C at certain temperature drop. EFFECT: improved design. 4 cl, 2 dwg
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