FIELD: engine engineering. SUBSTANCE: group has cylinder 1 and piston received in the cylinder and provided with top piston ring 4 of rectangular cross- section. Ring groove 7 is made in the inner side of cylinder 1 above the top plane of the top piston ring, the diameter of the ring groove being equal to the diameter of a cylinder which has been wear out in maximum. The cross-section of groove 7 is trapezium. The grater base of the trapezium lies on the side of the cylinder. The angles at the bottom of the trapezium is equal to 42-2° and at the top base is 90-1°. The length of the grater base is less than the thickness of the mostly thin ring of the group. EFFECT: simplified design and enhanced reliability. 2 dwg, 1 tbl
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