What is the working principle of the oil filter? And how does it work?

The oil filter, literally, we can also see that it can play a filtering role. Indeed, the oil filter can filter out some impurities in the oil, so that the oil that enters the engine is of high quality and there is no problem, so as to ensure the normal operation of the engine. So how does the oil filter work and what is the working principle of the oil filter?

The oil filter is located in the engine lubrication system. The upstream of the oil filter is the oil pump, and the downstream is the parts that need to be lubricated in the engine. The function of the oil filter is to filter out harmful impurities in the oil, and supply the crankshaft, connecting rod, camshaft, supercharger, piston ring and other moving parts with clean oil to play the role of lubrication, cooling and cleaning, thereby Extend the life of these parts.

The oil filter is mainly composed of filter paper and housing, as well as auxiliary components such as sealing ring, support spring, and bypass valve. What we see from the appearance is the oil filter as a whole, the filter paper, bypass valve and other parts are invisible. During the operation of the engine, with the operation of the oil pump, the oil with impurities continuously enters the oil filter from the oil inlet on the bottom plate assembly of the oil filter, and then passes through the check valve to the outside of the filter paper to wait for filtration; Under the action of oil pressure, the oil continuously passes through the filter paper and enters the center tube, while the impurities in the oil remain on the filter paper; the oil entering the center tube enters the engine lubrication system from the oil outlet in the middle of the oil filter bottom plate Participate in lubrication.

With the continuous accumulation of impurities on the filter paper, the passability of the filter paper continues to decrease, and the circulation resistance continues to increase, causing the oil pressure on the outside of the filter paper to increase. When the oil pressure is sufficient to open the bypass valve, the oil is no longer filtered by the filter paper, but directly enters the center pipe from the bypass valve, and then enters the engine lubrication system from the oil outlet in the middle of the oil filter base plate to participate in lubrication. In this way, even if the filter paper is clogged, the normal circulation of the oil can be ensured, but the oil filter no longer filters impurities in the oil. Therefore, the oil filter is usually classified as a vulnerable part and needs to be replaced regularly to ensure a good filtering effect.