FIELD: engine engineering. SUBSTANCE: shaped ring groove is provided on the sleeve from the side of the piston over periphery. The groove is at a level of the top end face surface of the piston compression ring when it is in the top dead center. The width of the sloping wall of the groove is equal to the maximum total space between the piston and pin, pin and connecting rod, and connecting rod and crankshaft. The depth of the ring groove corresponds to the magnitude of ultimate allowable wear of the cylinder sleeve in the working zone. The top and bottom walls of the ring groove are inclined. EFFECT: increases longevity. 1 dwg
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