FIELD: tractor engineering. SUBSTANCE: engine cylinder block has heads installed in cylinder and provided with holes. Pistons are mounted on rod which is installed along cylinder axis in holes of heads for reciprocating. Each head has sealing belt of interconnected rings. Each piston of one head has two bottoms arranged at opposite sides. Hole of each head is provided with sealing belt assembled of rings. Delivery of oil under pressure on rings of each piston and its takeoff is carried out along channels located in rod and piston. EFFECT: reduced weight per power unit, increased service life. 4 cl, 5 dwg
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