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　　Piston ring and piston cylinder together prevent gas leakage, Han control oil channeling and heat transfer to the air cylinder wall function. , of course, absolute seal is impossible, as long as the air leakage does not exceed 0.5% of squid gas inhalation, the oil consumption is less than 1% of the fuel consumption over the same period, you can think sealing is effective.
　　Most of the automobile engine piston is provided with a 2-3 flue gas ring and an oil ring, a few large bore engine with 3 gas rings and P% oil ring. The oil ring when the piston down the excess oil from the cylinder wall scraping down to reduce channeling the amount of oil, the main functions of the gas ring is sealed gas, but in the oil ring above the one or two flue gas ring (the third and the second gas ring) usually require a certain scraping oil to enhance oil channeling control.