1. Introduction piston
Application
rings widely used in various powered machines, such as steam engines, diesel engines, gasoline engines, compressors, hydraulic machines, widely used in car, piston rings trains, ships and yachts. Usually piston mounted in the piston ring groove, and that piston, cylinder, cylinder head and other elements work chamber.
Value
is a core member inside the piston combustion engine, the sealing is completed and the fuel gas together with its cylinders, pistons, the cylinder wall or the like. Used automobile engines diesel and gasoline engines have two kinds of fuel due to the difference of its performance, its use is not the same piston rings, piston ring formation by casting early, but as technology advances, high power steel piston rings birth and with the continuous improvement of the functions of the engine, environmental requirements, advanced applications in which surface treatment such as thermal spraying, plating, chrome plating, nitriding gas, physical deposition, surface coating, zinc-manganese phosphating treatment or the like, the piston ring features greatly improved.
Function
includes a sealing action of the piston ring, adjusting (support) acting four oil (Oil), thermal (heat transfer), the guide. Sealing: gas sealing means, the combustion chamber to prevent leakage of gas to the crankcase, the amount of gas leakage to a minimum, improving thermal efficiency. Leakage will not only decrease the power of the engine, and make oil deterioration, which is the main task of the gas ring; regulating oil (Oil): the surplus lubricating oil scraped off the cylinder wall, while leaving a thin cloth to the cylinder wall thin film, and ensure the normal lubrication of the piston and cylinder ring, which is the main task of the oil ring. In modern high-speed engines, with special emphasis control action piston oil film; thermal conductivity: piston by heat transfer to the piston cylinder, i.e. cooling effect. According to reliable data suggest that a non-cooled piston in the piston crown has suffered heat percentage is 70 to 80 pass through the cylinder wall and the piston ring dissipated, cooling piston 30 to piston 40 to pass through the cylinder percentage wall dissipated; support: piston holding the piston in the cylinder, the piston and the cylinder to preventDirect contact with the wall, to ensure smooth movement of the piston, to reduce friction, and prevent the piston from knocking. Piston engines of gasoline using two gas rings, an oil ring, diesel engines typically employ two gas rings, an oil ring.