A filter refers to an accessory that filters impurities or gases through filter paper. Generally refers to auto filter, which is an accessory of the engine.
According to different filtering functions, it is divided into: oil filter, fuel filter (gasoline filter, diesel filter, oil-water separator, hydraulic filter), air filter, air conditioning filter, etc. The engine has three types of filters: air, oil, and fuel, generally called "three filters", plus an air conditioning filter, commonly known as four filters. They are respectively responsible for the lubrication system, the medium in the combustion system, the engine intake system, and the filtration of the cabin air circulation system.
1. Oil filter
The oil filter is located in the engine lubrication system. Its upstream is the oil pump, and its downstream is the various parts in the engine that need to be lubricated. Its function is to filter out harmful impurities in the engine oil from the oil pan, and supply the clean engine oil to the crankshaft, connecting rod, camshaft, supercharger, piston ring and other kinematic pairs to lubricate, cool and clean, thereby Extend the life of these components.
The centrifugal oil filter has a rotor sleeved on a shaft, and has two nozzles with opposite spraying directions. When the oil enters the rotor and comes out from the nozzles, the rotor rotates rapidly to clean the oil in the rotor body. Impurities in the oil are centrifugally thrown to the inner wall of the rotor, and the oil from the nozzle flows back to the oil pan. The centrifugal oil filter is characterized by stable performance and no filter element that needs to be replaced. As long as the rotor is disassembled regularly, the dirt deposited on the rotor wall can be cleaned and reused. Its life can be equal to that of the engine. Its shortcoming lies in complex structure, high price, bulky, etc., and it has high technical requirements for users.
Full-flow oil filters, such as replaceable, spin-on, split centrifugal, etc., filter all the oil entering the system. The split filter only filters 5%-10% of the oil supplied by the oil pump. Split-flow oil filters are all fine filters, which are generally used in combination with full-flow. Most low-power engines only use full-flow filters, and larger-power diesel engines mostly use full-flow plus split-flow filters.
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