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Lubricating oil filter in the system in order to make the lubricating oil flow unimpeded, avoid scratches, hair parts surface impurities, oil before sent to the friction surface, must go through strict filtration. To throw the filtration effect of meaning, and don't make oil resistance increases, the general way of the strainer and the main oil series, fine filter and the main oil passage in parallel.
1, float type oil filter, in order to make oil pump work well, must be the larger particles in the lubricating oil before entering the oil pump to remove impurities, the task set by the filter. It joins in the oil pump inlet, oil pump, the oil from the slit between the cover and float inhaled, through the mesh filter to bulky after impurities, the welding pipe into the oil pump on the float. When the mesh is silting up, and into the tubing suction increases, overcome mesh of powerful and bad mouth leave cover, engine oil and without screen directly from the ring into the suction mouth of tubing.
2, strainer series between the oil pump and main oil way, so it is also called the full flow filter, used to remove larger impurities from the oil. At home and abroad is used more common is a paper filter. Is mainly composed of cap, shell, paper filter and by-pass valve, etc. When the engine is working, with pressure lubricating oil into filter around into the filter within the cavity around the oil in a large impurity is blocked by paper filter, and clean the oil into the filter element inner cavity, and then through the oil outlet into the cylinder block of main oil way.
3, fine filter, its function is to filter out smaller impurities in lubricating oil, usually with the main oil passage in parallel, which has two kinds of centrifugal and paper plate.
4, centrifugal fine filter structure: a hollow shaft fixed on the shell, the daughter and the end set into an organic whole, is located on the thrust bearing, can turn freely around the rotor shaft. Gland nut tighten rotor turn cover and daughter together, in the spring compression, in order to limit the rotor axial movement, under the rotor is equipped with two mutual into reverse nozzle. When the engine is running, from a small part of the oil pump pumping oil, the oil into the filter. When oil pressure is lower than 9 s kpa, the oil pressure limiting valve closed, fine filter doesn't work. When the oil pressure of more than 98000 mpa, the pressure limiting valve opening gradually, the oil by the rotor shaft center hole, since the oil hole. Then turn the oil hole into the daughter, and from two nozzle, so jet counterforce which push on rotation. When oil pressure rises to 294000 mpa, the rotor speed can reach more than 5000 r/min, the proportion of the impurity in the lubricating oil inside the rotor cavity is greater than the lubricating oil, under the effect of rotating centrifugal force, was put to the rotor wall, with cover in the walls. Clean lubricating oil, the center into two nozzle, from the center to a jet, jet of lubricating oil flows back to the crankcase.