Piston ring is used to enter the piston
groove ring, divided into two types: compression ring and oil ring. The
compression ring can be used to seal the compressed air in the combustion
chamber; the oil ring is used to scrape off the excess oil on the cylinder. The
pistonring is a metal elastic ring with large outward expansion
deformation, which is fitted into the corresponding annular groove of the
profile. Reciprocating and rotating motion of the piston ring, relying on the
gas or liquid pressure difference between the ring in the outer surface and the
cylinder and ring and ring groove between the side to form a seal.
Piston ring applications:
Piston rings are widely used in a variety
of power machinery, such as steam engines, diesel engines, gasoline engines,
compressors, hydraulic presses, widely used in automobiles, trains, ships,
yachts and so on. General piston ring installed in the piston ring groove, it
and the piston, cylinder, cylinder head and other components of the composition
of the chamber work.
Piston ring function:
Piston ring action includes sealing, regulating oil (oil control), heat
conduction (heat transfer), guide (support) four roles. Seal: refers to the
sealed gas, do not let the combustion chamber of the gas leakage to the
crankcase, the gas leakage control to a minimum, improve thermal efficiency.
Leakage will not only make the engine power down, but also make the oil
deterioration, which is the main task of the gas ring; adjust the oil (oil
control): the cylinder wall of the excess oil scraping off, while the cylinder
wall cloth thin Thin oil film to ensure the normal lubrication of the cylinder
and piston and ring, which is the main task of the oil ring. In the modern
high-speed engine, with particular emphasis on the role of the piston ring
control film; heat: the piston ring through the piston heat conduction to the
cylinder, that is, from the cooling effect. According to reliable data, the
piston top of the heat received by 70 to 80% through the piston ring to the
cylinder wall and scattered; support: the piston ring to keep the piston in the
cylinder to prevent the piston and the cylinder wall in direct contact, To
ensure smooth movement of the piston, reduce frictional resistance, and to
prevent the piston knocking cylinder. General gasoline engine piston with two
air ring, an oil ring, while the diesel engine is used three air ring, an oil
ring.
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