The oil filter is located in the engine lubrication system. Above it is the oil pump, below it is the engine that requires lubricating parts. Its function is to filter harmful impurities in the oil from the oil pan, supplying the crankshaft, connecting rod, camshaft, supercharger, piston ring, and other moving parts with clean oil, playing a role in lubrication, cooling, and cleaning, in order to extend the service life of these parts.
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The centrifugal oil filter has a rotor sleeve on the shaft, and two spray nozzles in opposite directions. When the oil exits the nozzle in the rotor, the rotor spins quickly, the oil in the rotor housing is clean, impurities in the oil are thrown centrifugally against the inner wall of the rotor, and the oil flows back from the nozzle to the oil pan. Centrifugal oil filters are characterized by stable performance and do not require replacement of the filter element. As long as the rotor is regularly removed, the dirt on the rotor wall can be cleaned and reused. Its service life is comparable to the engine's service life. Its disadvantage is its complex structure, high cost, bulkiness, etc., requiring users to have higher technical requirements.
Full-flow oil filters, such as the previously mentioned interchangeable, rotating, bypass centrifuges, etc., filter all oils entering the system. The bypass filter only filters 5%-10% of the oil supplied by the oil pump. The bypass oil filter is a fine filter, and it is generally used in conjunction with the full flow. Most low-power engines use only full-flow filters, while high-power diesel engines mainly use full-flow and bypass filters.