First, let’s talk about the piston rings of the engine. Today’s car engines are called oval-propeller piston engines. The piston moves up and down in the cylinder to convert the thermal energy of fuel combustion into mechanical energy and output it to the outside world. Here, the degree of sealing between the piston and the cylinder has a great influence on the working efficiency of the engine.
The piston ring is a metal ring, which is divided into two types: gas ring and oil ring. The main function of the gas ring is to seal. There are usually two cases. The main function of the oil ring is to scrape and distribute oil to improve the lubrication of the cylinder walls. Usually, there is only one. The piston is equipped with a piston ring, and the part with the piston ring is called the piston ring groove. After the piston ring is installed on the cylinder, three barriers are formed between the groove of the piston ring, the piston ring, and the cylinder wall, namely end cleaning, side cleaning, and rear cleaning. All three pitchers are very small, typically, the end pitch is 0.3 ~ 0.5 mm, the side pitch is 0.05 ~ 0.1 mm, and the rear pitch is 0.1 ~ 0.3 mm.
These three gaps form two sealing surfaces and elastic leakage channels between the piston ring, piston, and cylinder wall. The first seal will seal about 80 to 90% of the seal, and the second seal will seal about 10 to 10. 20% of the sealing gas, 5% of the oil ring sealing gas. Coupled with the secondary sealing effect of the high-pressure gas, the gas that finally leaks from the combustion chamber to the crankcase accounts for only 0.2% to 1.0% of the intake air, and the sealing is relatively successful, which is one of the important reasons why the reciprocating piston engine still powerful?
In addition, because the piston ring has “three gaps”, it reciprocates up and down in the cylinder. As the piston moves down in the cylinder, oil from the cylinder wall enters the backlash through the backlash of the piston rings. As the piston moves up in the cylinder, the oil in the backlash enters above the backlash and is absorbed. Anti-peak. sent to the combustion chamber for combustion. This phenomenon will continue to repeat during the operation of the engine, and the oil will gradually be consumed. This phenomenon, known as “piston ring pump”, is one of the inherent characteristics of egg ring engines, which consume oil to varying degrees depending on the make and model of the engine. The larger the three gaps of the piston ring, the stronger the effect of pumping oil and the greater the consumption of oil. In the process of using the engine, due to wear and tear, the three gaps gradually become larger, and the oil consumption will also increase.
So, how is this part of carbon deposits formed? Here, the high-temperature and high-pressure gas in the combustion chamber are blocked by the two gas rings above, almost no gas enters the oil ring, and the impact on the formation of carbon deposits is almost negligible. The carbon deposits in this part are mainly formed from petroleum. The main function of the oil ring is to scrape the oil off, so it is always covered with oil. At the high temperature of the piston, these oils slowly coke and solidify, eventually forming carbon deposits. This is the mechanism of the formation of carbon deposits in the oil ring.
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