1. Basic introduction
During the working process of the engine, metal grinding debris, dust, oxidized carbon deposits and colloidal deposits at high temperatures, water, etc. are constantly mixed into the lubricating oil. The function of the oil filter is to filter out these mechanical impurities and colloids, to keep the lubricating oil clean and to extend its service life. The oil filter should have strong filtration capacity, low flow resistance and long service life. In general lubrication systems, filters with several different filtration capacities - collectors, strainers and fine filters - are connected in parallel or in series in the main oil gallery. (The full-flow filter is connected in series with the main oil passage. When the engine is working, the lubricating oil is completely filtered by the filter; the shunt filter is connected in parallel with it). The strainer is connected in series in the main oil passage, which is a full flow type; the fine filter is connected in parallel in the main oil passage, which is a split flow type. Modern car engines generally only have a filter and a full-flow oil filter.
2. Technical characteristics of the filter
â— Filter paper: The oil filter requires higher filter paper than the air filter, mainly because the temperature change of the oil varies from 0 to 300 degrees. Under the severe temperature change, the oil concentration also changes accordingly. Will affect the filtration flow of the oil. The filter paper of the high-quality oil filter can filter impurities under severe temperature changes to ensure sufficient flow.
â—Rubber seal: The filter seal of high-quality oil is made of special rubber to ensure 100% oil leakage.
â— Reflow suppression valve: only available in high quality oil filters. When the engine is turned off, it prevents the oil filter from drying out; when the engine is re-ignited, it immediately generates pressure and supplies oil to the engine.
â— Overflow valve: Only available in high quality oil filters. When the external temperature drops to a certain value or when the oil filter exceeds the normal service life, the relief valve will open under special pressure, allowing unfiltered oil to flow directly into the engine. Despite this, impurities in the oil can enter the engine, but it is much smaller than the loss caused by the absence of oil in the engine. The relief valve is therefore the key to protecting the engine in an emergency.
3. Filter installation and replacement cycle
â—Installation:
a) drain or suck dry old oil
b) Loosen the set Screw and remove the old oil filter
c) Apply a layer of oil to the seal of the new oil filter
d) Install a new oil filter and tighten the set screws
â—Recommended replacement cycle: Cars and commercial vehicles are replaced once every six months
4. Automotive requirements for oil filters
Filtering accuracy, filtering out all > 30 um particles,
Reduce particles entering the lubrication gap and causing wear (< 3 um - 30 um)
The oil flow is in line with the engine oil demand.
Long replacement cycle, at least longer than oil life (km, time)
The filtration accuracy is in line with the protection of the engine and reduces the wear requirements.
Large volume of ash, suitable for harsh environments.
Can adapt to higher oil temperature and corrosion.
When the oil is filtered, the pressure difference is as low as possible, so that the oil passes smoothly.
Concerned about surprises
Tag: oil, oil filter, lubrication system, main oil passage, relief valve
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