BUILTUP PISTON RING Russian patent published in 2000 - IPC

FIELD: piston apparatuses such as internal combustion engines, compressors and others. SUBSTANCE: builtup piston ring includes set of plate-type rings and bent as one piece tangential expander made of metallic rectangular cross section belt with rounded edges. Novelty is radial supporting flanges inclined one relative to another and relative to bridges joining them. Height of profile of tangential expander (according to its end abutments) is more than height of respective piston groove by 1.5 times or less. EFFECT: enhanced efficiency of oil scraping and compression properties of builtup piston ring, high reliability of operation of cylinder-piston group of engine, reduced consumption of fuel and lubricant materials, lowered quantity of harmful exhaust into environment. 7 dwg