The oil filter is the machine filter we often say. Its function is to remove impurities such as dust, metal particles, carbon deposits and soot particles from the oil to protect the engine.
During the operation of the engine, metal grinding debris, dust, oxidized carbon deposits and colloidal deposits at high temperatures, water, etc. are constantly mixed into the lubricating oil. The function of the oil filter is to filter out these mechanical impurities and colloids, to keep the lubricating oil clean and to extend its service life. The oil filter should have strong filtration capacity, low flow resistance and long service life.
Due to the high viscosity of the oil itself and the high content of impurities in the oil, in order to improve the filtration efficiency, the oil filter generally has three stages, namely the oil filter, the oil strainer and the oil fine filter. The filter is installed in the oil pan of the oil pump, and is generally made of metal mesh. The oil coarse filter is installed behind the oil pump and is connected in series with the main oil passage. There are mainly metal scraper type, sawdust filter type and microporous filter paper type. Now, the microporous filter paper type is mainly used. The fine oil filter is installed in parallel with the main oil passage after the oil pump, and mainly has two types of microporous filter paper and rotor type. The rotor type oil fine filter adopts centrifugal filtration and has no filter element, which effectively solves the contradiction between the oil passing property and the filtering efficiency.