piston ring

Abstract

The invention discloses a piston ring, which comprises a piston ring substrate, a chromium layer and a copper layer; the chromium layer is coated on the outer circular surface of the piston ring substrate by an electrochemical deposition method; the copper layer is coated by an electrochemical deposition method Applied on the outer surface of a chrome-coated piston ring base. The chromium layer and the copper layer of the present invention form a combined coating with gradient function, which combines the advantages of soft copper layer, good initial running-in performance and sealing performance, high hardness of the chromium layer, and good wear resistance, so that the piston The ring and the cylinder liner can realize a smooth transition between the initial run-in stage and the normal wear stage, which reduces the risk of cylinder scuffing during the run-in period and prolongs the service life of the piston ring.

Description

technical field [0001] The present invention relates to piston rings. Background technique [0002] Piston ring is one of the key parts used in reciprocating motion machines such as internal combustion engines and compressors, which determines its performance. The engine oil on the cylinder is used to maintain the appropriate amount of engine oil consumption, transfer the high temperature generated by the combustion gas to the cylinder body, cool the piston, support the smooth reciprocating movement of the piston in the cylinder, and prevent the piston from directly contacting the cylinder wall. [0003] According to the above description of the role of the piston ring, the piston ring material must have the characteristics of friction and wear resistance, tensile cylinder resistance, and good initial running-in performance. Now the most commonly used piston ring materials are alloy cast iron, nodular cast iron and steel. Through surface treatment The method to achieve the ...

AI Technical Summary

Problems solved by technology

However, the melting point of metal tin is low, only 231.89°C, and the first piston ring close to the combustion chamber bears the highest temperature, which often exceeds the melting point of tin, reaching about 260°C. At this temperature, metal tin melts into a mass and adheres to the cylinder wall On, fusion occurs, which affects the airtightness of the ring and the cylinder liner

On the other hand, the Mohs hardness of metal tin is 1.5, which is very low and easy to wear. Although the running-in of the ring and the cylinder liner can be achieved at the beginning of the running-in period, the airtightness of the piston ring is guaranteed, but the hardness is too low. Service life of tin layer

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