PISTON OF INTERNAL COMBUSTION ENGINE Russian patent published in 1998 - IPC

FIELD: mechanical engineering; internal combustion engines. SUBSTANCE: side surface of piston head and skirt is barrel-shaped in which H_o/D_p= 0,54...0,78, and H_d/D_p= 0,058-0,103 where D_p is nominal diameter of piston, H_o is distance from piston bottom to nominal diameter zone and H_d is height of heat dam. Head and skirt of piston are oval in horizontal section. Smaller axis of piston head oval lies in plane of piston axis parallel to axis of piston pin at Δ_o/D_p-(0,8-1,4)10^-3 where Δ_o is difference between sizes of larger and smaller axes of oval of piston head horizontal section. Invention contains relationships to which vertical profile of head and skirt is made. EFFECT: reduced mechanical losses in piston-liner pair, reduced oil burning losses, toxicity of exhaust gases and engine noise, increased engine economy and service life of cylinder-piston group. 5 cl, 5 dwg