Application of piston ring in life

Piston ring is a kind of metal elastic ring with large outward expansion deformation, which is assembled into the section and its corresponding Annular Groove. Reciprocating and rotating piston rings, depending on the pressure difference of gas or liquid, form a seal between the outer circular surface of the ring and the cylinder and one side of the ring and the ring groove. Piston rings are widely used in various power machines, such as steam engines, diesel engines, gasoline engines, compressors, hydraulic presses, etc. They are widely used in automobiles, trains, ships, yachts, etc. Generally, the piston ring is installed in the ring groove of the piston, and it and the piston, cylinder liner, cylinder head and other components form a chamber to do work. Piston ring is the core component inside the fuel engine. It seals the fuel gas together with the cylinder, piston, cylinder wall, etc. Common automobile engines include diesel and gasoline engines. Due to their different fuel performance, the piston rings used are also different. The early piston rings were formed by casting, but with the progress of technology, steel high-power piston rings were born, and with the continuous improvement of engine function and environmental requirements, various advanced surface treatment applications, such as thermal spraying, electroplating, chrome plating, gas nitriding, physical deposition, the surface coating, zinc-manganese phosphating treatment, etc. greatly improve the function of the piston ring. The function of piston ring the function of piston ring includes sealing and adjusting engine oil (Oil Control)Heat conduction (Heat transfer)Guidance (Support)Four roles. Seal of piston ring: refers to sealing gas to prevent the gas in the combustion chamber from leaking to the crankcase, controlling the leakage of gas to a minimum and improving the thermal efficiency. Air leakage will not only reduce the power of the engine, but also deteriorate the engine oil, which is the main task of the Air ring; Piston ring adjustment oil (Oil Control) : Scrape off the excess lubricating oil on the cylinder wall and at the same time make the cylinder wall covered with a thin oil film to ensure the normal lubrication of the cylinder, piston and ring, which is the main task of the oil ring. In modern high-speed engines, special attention is paid to the role of piston rings in controlling oil film; Heat conduction of the piston ring: the heat of the piston is conducted to the cylinder liner through the piston ring, which is used for cooling. According to reliable data, 70 ~ of the heat received by the piston top in the non-cooling piston ~ 80% is scattered by passing the piston ring to the cylinder wall, and 30 ~ in the cooling piston ~ 40% is passed through the piston ring to the cylinder wall and scattered; Support of piston ring: the piston ring keeps the piston in the cylinder to prevent direct contact between the piston and the cylinder wall, ensure smooth movement of the piston, reduce friction resistance and prevent the piston from knocking on the cylinder. Generally, the piston of a gasoline engine uses two gas rings and one oil ring, while a diesel engine usually uses two gas rings and one oil ring.

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