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First, the definition
piston curl is the metal elastic link which one kind has greatly outward expands distorts, if it is assembled to the section plane in the corresponding ring channel. The reciprocation and the rotary motion piston curl, depends upon the gas or the liquid pressure difference, the disc and the air cylinder as well as the link and between a ring groove side forms the seal outside the link.
Second, the application scope
piston curl widely uses on each kind of power generator, like steam engine, diesel engine, gasoline engine, compressor, hydraulic press and so on. The general piston curl installs in the piston ring groove, part group cavitation room acting and so on it and piston, cylinder jacket, cylinder cover.
Third, the function and the function
piston curl function including the seal, the adjustment machine oil (controls oil), the heat conduction (heat transfer), the guidance (supporting) four functions. Seal: Refers to the seal fuel gas, does not let the combustion chamber the gas leak the crank case, the gas spillage control in the threshold, enhances the thermal efficiency. Not only the air leakage can cause the engine the power drop, moreover can cause the machine oil deterioration, this is the gas ring primary mission; The adjustment machine oil (controls oil): Cylinder wall on under unnecessary lubrication oil wiper, simultaneously enable on the cylinder wall the cloth to have the light lubricant film, guarantees the air cylinder and the piston and the link normal lubrication. On the modern high-speed engine, takes the piston curl control lubricant film specially the function; Heat conduction: Gives through the piston curl the piston thermal conduction the cylinder jacket, namely cooling effect. According to the reliable material believed, the piston crown receives in the quantity of heat has 70~80% is passes to the cylinder wall through the piston curl to disperse; Supporting: The piston curl maintains the piston in the air cylinder, prevented the piston and the cylinder wall direct contact, guaranteed the piston smooth movement, reduces the friction drag, moreover prevents the piston piston knock.
Fourth, East Asian product type
1.According to structure minute
A£®Overall link: Only assembles a components composition in a ring groove the piston curl.
B£®Combines the link: Assembles two or two above components composition piston curl in a ring groove.
C£®Gas ring: Mainly uses for to prevent gas divulging the piston curl.
D£®Oil ring: Has the oil hole or the equivalent structure, can blow the machine oil piston curl from the cylinder wall.
E£®Slot oil ring: Side parallel, has two slip ring shores, and has the oil hole oil ring.
F£®The slot screw supports the reed oil ring: Canada sets at the screw in the slot oil ring to support the reed the oil ring. Supports the reed to be able to enhance the radial direction compared to the pressure, it is equal to the annulus internal surface action. Common in diesel engine link.
G£®Steel belt combination oil ring: By the bushing ring and two pieces the oil ring which blows the link combination to become. But bushing ring design along with plant different, common in gasoline engine link.
2.Divides the barrel surface link, the conical surface link according to the form of section, in the bevel edge distortion link, the wedge-shaped link and the trapezoidal link, the nose shape link, outside the ledge distortion link, in the bevel edge distortion link, the steel belt combination oil ring, different to the bevel edge oil ring, the cocurrent bevel edge oil ring, the cast iron screw supports the reed oil ring, the steel oil ring and so on
3.According to material minute(The click examines the detailed form)
Continues the table£º(The click examines the detailed form)
4.According to surface treatment minute nitriding link: Nitrided level degree of hardness reaches above 950HV, the brittle 1 level, has the good resistance to wear and the corrosion resistance. Chrome plated ring: Chrome-plating level crystal careful close smooth, degree of hardness achieved above 850HV, the wear-resisting performance is extremely good, the micro crack network which spreads across, favors the storage lubricating oil. Phosphorizes the link: Through chemistry processing method, causes the piston curl surface to produce a phosphorization membrane, plays rust prevention role at the same time to the product, also may enhance the link the initial period running-in ability. Oxidizes the link: In high temperature and under the strong oxidant condition, steel and iron material surface production oxide film, has the inoxidizability, the anti-attrition`lubrication and the good outward appearance.
5¡¢The piston curl marks
GB/T 1149.1¡ª94 Stipulation: All requests have the installment direction piston curl to be supposed in on side, namely the close combustion chamber side symbolized. The link symbolized which in on side includes: The conical surface link, in the bevel edge, circumscribes the Taiwan link, the nose shape link, the wedge-shaped link and the request installment direction oil ring, our company surrounds on side mark has¡°DY¡±¡¢¡°NDY¡±¡¢¡°DA¡±¡¢¡°3N¡±¡¢¡°D¡±¡£
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