Piston of supercharged engine

Abstract

The invention discloses a piston of a supercharged engine. The piston comprises a piston body, the outer circumference of the piston body is sequentially provided with an air ring slot, a scraping ring slot and an oil ring slot, the outer circumference of the piston body is provided with an annular release slot arranged on a bank ring between the air ring slot and the scraping ring slot. On the premise of higher gas pressure, the piston can guarantee good contact between the air ring and the air ring slot, blowby of the gas is reduced, and heat efficiency of the engine is improved.

Description

technical field [0001] The invention belongs to engine pistons, in particular to a booster engine piston. Background technique [0002] The piston is the core component inside the fuel engine. It forms a fuel gas seal together with the piston ring, cylinder head, and cylinder wall. Among them, the gas ring in the piston ring is mainly used to seal the gap between the piston and the cylinder wall to prevent the cylinder from leaking. The internal gas escapes into the crankcase, affecting the thermal efficiency of the engine. [0003] see image 3 , the existing piston includes a piston body 1, the outer circumference of the piston body 1 is provided with a gas ring groove 2, a scraper ring groove 3 and an oil ring groove 4 in sequence, and a gas ring 7 is housed in the gas ring groove 2 , The scraper ring 8 is installed in the scraper ring groove 3, and the oil ring 9 is installed in the oil ring groove 4. see Figure 4 , in a naturally aspirated engine, the air pressure P...

AI Technical Summary

Problems solved by technology

see Figure 5 , with the increase of the gas pressure, the amount of gas leaked between the gas ring 7 and the scraper ring 8 increases improperly, because the compression and combustion pressure of the engine is very high during operation, especially the gas pressure in the supercharged engine is even higher. High, according to the Clapeyron equation, in the case of the same volume and temperature, the air pressure gradually increases with the increase of leakage, so the air pressure P1 under the air ring 7 gradually increases, when the air pressure P1 increases to a certain extent At this time, the gas ring 7 will be suspended in the middle of the gas ring groove 2, causing a large amount of gas to leak through the gap between the gas ring 7 and the upper and lower walls of the gas ring groove 2 to the scraper ring 8 and the oil ring 9, and finally Leaks into the crankcase interior, resulting in increased blow-by

[0004] At present, the problem of high air leakage of supercharged engines is mainly solved by optimizing the piston ring, especially the optimization of the gas ring, which mainly includes reducing the side clearance between the gas ring and the gas ring groove, reducing the gap between the gas ring and the gas ring Although the bottom gap of the ring groove, the reduction of the closing gap of the gas ring and the increase of the contact pressure of the gas ring can improve the air leakage to a certain extent, higher requirements are placed on the processing, material properties and surface treatment technology of the piston ring , the cost is high, so it has certain limitations

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