In the lubricating system, the oil filter is used to make the lubricating oil flow unimpeded, avoiding the scratches of the impurities and the surface of the brushed parts. The oil must be strictly filtered before being sent to the friction surface. In order to achieve a satisfactory filtration effect without increasing the oil path resistance, the strainer is generally connected in series with the main oil passage, and the fine filter is connected in parallel with the main oil passage.
1. The float type oil collector filter, in order to make the oil pump work well, the large particle impurities in the lubricating oil must be removed before entering the oil pump. This task is undertaken by the filter. It is connected to the oil pump inlet. When the oil pump is working, the oil is sucked from the slit between the cover and the float. After filtering the coarse impurities through the filter, the oil pipe welded to the float enters the oil pump. When the filter screen is fouled, the suction force of the oil inlet pipe increases, and the strength of the filter mesh is overcome to cause the bad port to leave the cover, and the oil enters the suction pipe directly from the ring mouth without passing through the filter screen.
2. The strainer is connected in series between the oil pump and the main oil passage, so it is also called a full-flow filter to remove large impurities in the oil. Mainly composed of upper cover, outer casing, paper filter and bypass valve. When the engine is working, the pressurized lubricating oil is sent into the cavity around the filter element into the cavity around the filter element. The larger impurities in the oil are blocked by the paper filter element, and the clean lubricating oil enters the inner cavity of the filter element and then passes through the oil outlet. Enter the main oil passage of the cylinder block.
3, fine filter: its role is to filter out the smaller impurities in the lubricating oil, usually in parallel with the main oil passage, there are two types of centrifugal and cardboard.
4. The structure of the centrifugal fine filter: the hollow rotating shaft is fixed on the outer casing, and the rotor body and the end sleeve are integrally connected, and are located on the thrust bearing, and can rotate freely around the rotor shaft. The compression nut fastens the rotor cover to the rotor body and is spring-loaded to limit axial movement of the rotor. Two counter-reverse nozzles are mounted under the rotor. When the engine is running, a small portion of the oil is pumped from the oil pump and enters the filter through the oil port. When the oil pressure is lower than 9s kPa, the oil pressure limiting valve is closed and the fine filter does not work. When the oil pressure exceeds 98 kPa and the pressure limiting valve is gradually opened, the oil is sprayed out through the center hole of the rotor shaft and out of the oil hole. Then, it enters the rotor body through the oil hole and is ejected from the two nozzles, so that the jet reaction force pushes the hand to rotate. When the oil pressure rises to 294 kPa, the rotation speed of the rotor can reach 5000r/min or more. The specific gravity of the impurities in the lubricating oil of the rotor cavity is larger than that of the lubricating oil, and is thrown to the rotor wall under the action of the centrifugal force of rotation. Attached to the wall. The clean lubricating oil at the center enters the two nozzles from the center and is continuously injected outward, and the discharged lubricating oil flows back to the lower crankcase.
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