Professional Custom Piston Rings Manufacturer and Spplier sales@heartenauto.com
First, the definition of 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, as well as one side of the ring and the ring groove. II. Application scope piston rings are widely used in various power machines, such as steam engines, diesel engines, gasoline engines, compressors, hydraulic presses, etc. Generally, the piston ring is installed in the ring groove of the piston. It and the piston, cylinder liner, cylinder head and other components form a chamber to do work. Three, function and function piston ring function includes sealing, adjusting engine oil (Oil Control)Heat conduction (Heat transfer), Guidance (Support)Four functions. Sealing: refers to sealing the gas to prevent the gas in the combustion chamber from leaking to the crankcase, controlling the leakage of the 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; Adjust the 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. In modern high-speed engines, special attention is paid to the role of piston rings in controlling oil film; Heat conduction: 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 ~ 80% is passed to the cylinder wall through the piston ring and scattered; Support: The piston ring keeps the piston in the cylinder to prevent the piston from directly contacting the cylinder wall, ensure the smooth movement of the piston, reduce the friction resistance, and prevent the piston from knocking on the cylinder. Four, piston ring product type 1. According to the structure, A. Integral ring: A piston ring composed of only one part is assembled in A ring groove. B. Combined ring: a piston ring consisting of two or more parts is assembled in one ring groove. C. Gas ring: piston ring mainly used to prevent gas leakage. D. Oil ring: a piston ring with an oil return hole or equivalent structure that can scrape oil from the cylinder wall. E. Slotted oil ring: oil ring with parallel sides, two contact ring banks and oil return holes. F. Grooved spiral spring oil ring: add an oil ring with spiral spring in the grooved oil ring. The spring can increase the radial specific pressure, and its acting force on the surface of the ring body is equal. Common in diesel engine rings. G. Steel Belt combination oil Ring: An oil ring composed of a lining ring and two scraping rings. The design of lining ring varies from manufacturer to manufacturer and is common in gasoline engine ring. 2. According to the cross-sectional shape, it can be divided into barrel surface ring, conical surface ring, inner chamfer twist ring, wedge-shaped ring and trapezoidal ring, nose ring, outer shoulder twist ring, inner chamfer twist ring, steel belt combination oil ring and reverse chamfer oil ring, chamfered oil ring in the same direction, cast iron spiral spring oil ring, steel oil ring, etc. 3. Divided by material 4. According to the surface treatment, the nitrided ring is divided: the hardness of the nitrided layer is above 950HV, the brittleness is Grade 1, and the nitrided layer has good wear resistance and corrosion resistance. Chrome-plated ring: the chromium-plated layer has fine, compact and smooth crystals, a hardness of more than 850HV, very good wear resistance, and a crisscross micro-crack network, which is conducive to the storage of lubricating oil. Phosphating ring: through chemical treatment, a layer of phosphating film is produced on the surface of the piston ring, which can prevent rust of the product and improve the initial running-in property of the ring. Oxidation ring: under the conditions of high temperature and strong oxidant, an oxide film is formed on the surface of steel material, which has corrosion resistance, anti-wear lubrication and good appearance.
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