The oil filter consists of the following components, which together constitute the overall function of the oil filter.
1) Iron can (outer cylinder): a container used to hold the continuous pressure operation of the filter (filter paper), generally requiring a thickness of 0.4-0.6mm (for small cars) and 0.6-1.0mm (for large cars), with a pulling thickness not exceeding 20% -25%. It is required to withstand a pressure of 4-7 kilograms without deformation or damage;
2) Spring: used to press the filter (paper core) and fix it in an iron can during vibration and oil flow. Plate springs are also used, but the cost is higher;
3) But the rubber ring of the directional valve (return valve): it is used to prevent the oil from flowing back, so that there is oil in the oil filter for a long time, and the engine can be lubricated immediately when it is just started;
4) Filter: Used to filter sludge in oil, the filter material used is generally divided into surface filtration type and layer filtration type, consisting of filter paper and upper and lower bottom covers. The filter paper is most folded on the surface type;
5) Inner iron mesh: used to support and fix the paper core;
6) Safety valve: installed on the filter (paper core), its function is to automatically open when the filter (paper core) is blocked, and the oil pressure reaches one kilogram to allow the oil to pass through;
7) Bottom plate: used to connect the iron tank (outer cylinder) and fix the oil filter on the engine;
8) Connection plate: used to fix the rubber ring on the bottom plate;
9) Sealing ring: When the oil grille is installed on the engine, it serves as a seal and is installed on the connecting plate. It is generally 1.2-1.6mm higher than the oil grille, and its temperature resistance is required to reach -40 ℃ -140 ℃ without aging (usually requiring vulcanization treatment).