FIELD: transport engineering. SUBSTANCE: invention can be used in internal combustion engines. Piston-to-connecting rod ball joint is made in form of ball-shaped hollow head welded to upper end of connecting rod, said head being welded of two hemispheres. Hollow head is arranged in inner spherical space of piston welded up of upper and lower halves with slot. Connecting rod to provide lubrication of joint between upper hemisphere of connecting rod head and upper half of piston. EFFECT: increased service life of piston group. 2 cl, 3 dwg
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