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Study on the Structure of Combined Piston Ring and Its Blow-by Amount

Piston ring is an important part of internal combustion engine, which has a great influence on the performance of the whole engine. Taking the piston assembly of a single-cylinder diesel engine as the research object, and combining the measured cylinder pressure, temperature field and other data on the basis of theoretical calculations, a dynamic model of the piston ring assembly is constructed. The study focuses on the influence of piston ring structure and parameters on the blow-by volume, and uses different piston ring structures to test the bench blow-by volume. On this basis, a combined ring structure was proposed, and compared with the original piston ring structure, a comparative test of dynamic performance and blow-by gas was carried out. The results showed that the combined ring structure can significantly improve the blow-by gas.