Supercharged gasoline direct-injection engine piston ring set

Abstract

The invention relates to the field of engine parts, in particular to a supercharged gasoline direct-injection engine piston ring set. The supercharged gasoline direct-injection engine piston ring set comprises a first air ring, a second air ring and an oil ring closure part, wherein the cross section of the first air ring is in a shape of a cylindrical ring, the cross section of the second air ring is in a shape of a nose-shaped conical-surface ring, and oil return holes formed in a ciruclar ring of the oil ring closure part are in shapes of elongated holes. The closure gap D of the second air ring is 0.5-0.65 mm. Ten oil return holes of the oil ring closure part are evenly distributed in the circular ring, and the area of each oil return hole is 7 square milimeters. An oil scraping blade of the oil ring closure part is plated with chromium, and the surface of a circular ring body of the oil ring closure part is subjected to parkerizing treatment. The abrasion-resisting performance of the piston ring set is improved by 2-3 times, and the abrasion degree of a cast iron cylinder hole is reduced by 2-3 times. The frictional power consumption of the piston rings is reduced, so that the fuel consumption of an engine is reduced. The supercharged gasoline direct-injection engine piston ring set has very good oil return and self-cleaning capacities.

Description

technical field [0001] The invention relates to the field of engine parts, in particular to a piston ring set of a supercharged direct injection gasoline engine. Background technique [0002] As a representative of the current advanced gasoline engine technology, turbocharged gasoline direct injection (TGDI) engine can effectively improve fuel efficiency and power performance. Compared with traditional gasoline engines, it is smaller and lighter in weight. As the height of the piston structure continues to decrease, the ring height of the piston ring is also continuously reduced. The matching design of the existing common ductile iron or ordinary alloy steel piston ring materials with high bending strength and elastic modulus is difficult to meet the requirements of turbocharged gasoline. Injection (TGDI) engine reliability and durability requirements. Under high thermal load and mechanical load, the first air ring will have adverse conditions such as opening shrinkage, def...

AI Technical Summary

Problems solved by technology

As the height of the piston structure continues to decrease, the ring height of the piston ring is also continuously reduced. The matching design of the existing common ductile iron or ordinary alloy steel piston ring materials with high bending strength and elastic modulus is difficult to meet the requirements of turbocharged gasoline. Reliability and Durability Requirements for Injection (TGDI) Engines

Under high thermal load and mechanical load, the first air ring will have adverse conditions such as opening shrinkage, deflection deformation, scratching the cylinder bore, and local abnormal wear.

The second air ring and oil ring will also be deformed or even broken under high mechanical load

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