|
================================
[Concept] Engine oil, known as the "blood" of the car, can play on the engine lubrication, cleaning, cooling, sealing, anti-friction and other effects. The engine is the heart of the car, the engine has a lot of friction between the movement of the metal surface, the velocity of these components, environmental, operating temperature up to 400 ° C to 600 ° C. In such harsh conditions the surface, only qualified lubricants can reduce wear and tear of engine parts, extended service life ================================ [For use] --------------- 1, the lubricating antifriction] Between the piston and the cylinder, between the spindle and bearing relative sliding fast, to prevent excessive wear of parts, you will need in the oil film between two sliding surfaces. There are a sufficient thickness of the film relative sliding of the parts separated from the surface, so as to achieve the purpose of reducing wear and tear. --------------- 2, the cooling down] Oil heat back to the sump and then distributed to the air to help the tank to cool the engine. --------------- 3, cleaning Clean] Good oil to metal particles of the carbide, sludge, wear and tear on engine parts through the loop back to the sump, the flow of the lubricating oil, washing the parts work surface dirt. --------------- 4, leak-proof seal] Oil can be formed between the piston and the piston ring to reduce gas leakage and to prevent outside contaminants from entering. --------------- 5, rust corrosion Lubricant adsorption at the surface of the part to prevent water, air, acid and harmful gases and parts of the contact. --------------- 6, damping buffer] The sharp rise when the engine cylinder inlet pressure flare piston, the load on the piston crumbs, connecting rod and crankshaft bearings, this load transfer lubrication of bearings, to withstand the impact load to play the role of the buffer. --------------- In short: [Lubrication] Film lubrication to reduce friction and wear between moving parts. [Cooling] Away from the critical surface as a heat medium heat from the cooling effect. [Sealed] Filling the cylinder wall, the uneven surface of the valve stem at the turbocharger oil seal from the seal. [Clean] Dirt suspended in it, without fouling engine parts formed on the surface, since the cleaning effect. Damping and buffer] Especially the high-pressure parts such as gears and putting. [To prevent the oxidation and corrosion] Right the protective effect of onwards the parts. --------------- Note: Must be given to replace lost these functions when the diesel engine oil, oil under normal circumstances very little loss, but it is easy to pollution, and thus lose the protection of diesel engines. Oil pollution is a normal diesel engine operation results, because a lot of dirt into the oil during engine operation. They are: Diesel engine combustion byproducts - thin asphalt fuel incomplete combustion generated soot and acids. Acid, coke and fouling --- oil cracking decomposition or oxidation generated. Dirt --- through the air intake, fuel, and add oil or change the oil into a diesel engine dirt. ============================= 【Sub-class】 Different because of the base oil can be simply divided into Mineral oil / synthetic oil, two (vegetable oil output is scarce therefore not be counted). Synthetic oil is divided into: full synthetic / semi-synthetic. The fully synthetic motor oil is the highest level. --------------- Biggest difference between the two lies: the synthetic use of the temperature of broader and longer term, as well as higher cost; the same film requirements, synthetic oil can be used to lower the viscosity can be reached, and mineral oil is required as opposed to synthetic oil The thicker the viscosity in order to achieve such a request. In the same work environment, synthetic oil, because the lifespan is much longer than mineral oil, so the higher cost, but relatively oil changes, not much higher than mineral oil. --------------- SAE viscosity grade The viscosity of the lubricating oil to SAE rating logo, the SAE is the abbreviation of the English "American Automobile Engineers (Society of Automotive, Engineers). For example: SAE15W-40, SAE5W-40, "W" indicates winter (winter), the previous lower the number the better the low-temperature fluidity of the oil, lower the ambient temperature representative available on the engine in cold start ability to protect the better; "W" followed by the number of (a cross behind) is the oil temperature indicators, the greater the value of oil at high temperatures to protect the better the performance. --------------- API quality grade The quality of lubricating oil to API and other levels of identity, the API is the abbreviation for the English, "American Petroleum Institute (American Petroleum Institute). "S" series at the beginning of the gasoline engine oil specifications are: SA, the SB, SC, SD, SE, SF and SG, SH, SJ, SL, SM, the SN. "C" at the beginning of the series on behalf of the diesel engine oil, specifications are: CA, CB, the CC, CD, CE, CF, CF-2, CF-4, CG-4, CH-4, CI-4. When the "S" and two letters of "C" at the same time, it means that this oil for the steam / diesel Universal. A letter from the "SA" to the "SN", each increment, the performance of the oil will be better than the former, the oil will be more used to protect the engine additives. More letters later, the higher the quality and grade of the international brand of the oil level is above the SF level. ============================= 【Article is excerpted from: Baidu Encyclopedia】 【Network reprint / Just reference】 【Translation is by Goolge】 |
|
|
来自： LOFT生活 > 《Home Topics》
