The oil filter element generally has three levels

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 levels, namely the oil collector, the coarse oil filter and the fine oil filter. The strainer is installed in the front oil sump of the oil pump, and generally adopts a metal strainer type. The coarse oil filter is installed behind the oil pump and connected in series with the main oil passage. There are mainly metal scraper type, sawdust filter element type, and microporous filter paper type. Now the microporous filter paper type is mainly used. The fine oil filter is installed behind the oil pump and connected in parallel with the main oil passage. There are mainly two types: microporous filter paper type and rotor type. The rotor-type oil fine filter adopts centrifugal filtration and has no filter element, which effectively solves the contradiction between oil passability and filtration efficiency.