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The Function, Type and Working Principle of Automobile Oil Filter

The function of the automobile oil filter is to filter out the metal wear debris, mechanical impurities and oil oxides in the oil. If these impurities enter the lubrication system with the oil, it will increase the wear of engine parts, and may also block the oil pipes or oil passages.


Ⅰ. The type of oil filter


1. There are two types of car oil filters, which are installed before the oil pump and after the oil pump.


2. The oil filter installed before the oil pump is called the oil filter. There are two types of full flow and split flow installed after the oil pump according to its arrangement.


Ⅱ. The car oil filter - filter


The filter is generally a filter type, which is installed before the oil pump to prevent impurities with large particle size from entering the oil pump. There are two types of filters: floating and fixed. The floating filter can inhale cleaner oil on the oil surface, but the foam on the oil surface is easy to be inhaled, which reduces the oil pressure and makes the lubrication less reliable. The fixed filter is installed under the oil surface. The cleanliness of the inhaled oil is slightly inferior to that of the floating filter, but it can prevent foam inhalation, has reliable lubrication, and has a simple structure. At present, automobile engines use this kind of automobile oil filter- collector filter.


3. Full flow automobile oil filter


The full-flow oil filter is connected in series between the oil pump and the main oil passage, so all the oil is filtered through it. At present, full-flow automobile oil filters are commonly used in automobile engines.


The filter element of the full-flow automobile oil filter has various forms. At present, most automobile engines use paper filter element. The car oil filter with paper filter element has two structural forms, one is a decomposable type, just replace the paper filter element when replacing, and the other is an integral type, which needs to be completely replaced when replacing.


The full-flow automobile oil filter has a certain service life and should be replaced when it expires. When the filter element of the car oil filter is seriously blocked by impurities during the service life, the oil pressure at the oil inlet of the car oil filter will increase. When the pressure reaches the specified value, the bypass valve in the car oil filter will be opened. Through the valve, the oil directly enters the main oil passage without being filtered by the filter element. Although the oil is delivered to the various lubricating surfaces unfiltered at this time, it is far better than a lack of lubricating oil.


4. Split flow automobile oil filter


The engine of trucks, especially heavy trucks, generally adopts a full-flow + split-flow automobile oil filter arrangement. The full-flow filter is also called a coarse filter, which is used to filter impurities with a particle size of more than 0.05mm in the oil; the split-flow filter is also called a fine filter, which is used to filter out fine impurities with a particle size of more than 0.001mm, and only filter the oil of 5%~10% of the oil supply of the oil pump.

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