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Appointment lubrication system
The main purpose of the lubrication system of the engine - reduced wear of rubbing parts of the engine: pistons, cylinders, crankshaft bearings, timing. Engine oil also performs a sealing function - seals the gap between the piston and cylinder walls, where, despite the special rings, there is a gap in a few thousandths of a millimeter. Besides oil, and performs a cooling function. During the combustion of fuel received only a third of the energy used to perform useful actions. The remaining portion leaves as heat engine together with exhaust gases. Another part of the thermal energy is discharged through the cooling system and oil. For example, on the one hand, the heat from the piston rings and is discharged through the oil layer and then through the cylinder wall of the cooling liquid. On the other hand, the piston is directly cooled is sprayed into the crankcase oil. In addition, the oil is cooled all bearings of the crankshaft and camshaft, etc. Then, the heat absorbed by the oil through the oil pan diverted into the atmosphere. In designing engines for placing oil and other additional requirements: for example, it should not volatilize at a high temperature encountered on the working surface of the cylinder, as in these complex conditions must not be broken oil film. Combustion of oil should not be accompanied by the formation of a deposit - because oil consumption due to the combustion part of the process of the engine. The oil should also wash off the soot and dirt, so they do not accumulate in the engine. It should not lose properties with the passage of time and must also prevent contamination of the engine, etc.
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