FIELD: mechanical engineering; internal combustion engines with crosshead crank gear. SUBSTANCE: sectional piston has head made in the form of segments 1, each movably fitted on guide member 4 of support 3 and pressed to working surface of cylinder 8 by springs 9 installed in holes 10 made in guide members 4. Recesses 11 made on outer surface of segments 1 serve to reduce area of contact with working surface of cylinder. Holes 12 made on outer surface serve to accommodate solid lubricant rods. Proposed design makes it possible to dispense with piston rings and to use dry lubrication. EFFECT: enlarged operating capabilities. 3 dwg
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