FIELD: engine engineering. SUBSTANCE: parts of the cylinder-piston group of the engine are made of leuco-sapphire monocrystal. There are no stress concentrators on the surface of this material. The material has low friction coefficient, high hardness and low coefficient of linear extension. This enables piston 3 and walls of working cylinder 1 to be in immediate contact that, in turn, permits to abandon seals. Working cylinder and bushing 6 are mounted with tension owing to force bushing 6 is made of metal ceramic. EFFECT: enhanced efficiency. 9 cl, 2 dwg
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