FIELD: engine engineering. SUBSTANCE: piston compression and oil rings are received in grooves provided on outer surface of a head. Cross-section of the grooves is trapezium. The smaller base of the trapezium points to axis of the piston and is parallel to the axis. Conjugated face surfaces of the ring and groove are made mutually answering. Inclination of the face surface of the groove, which is opposite to the head, to smaller base of the trapezium exceeds inclination to smaller base of the trapezium of opposite face surface of the groove by 1.0- 1.5°. EFFECT: improved design. 1 dwg
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