﻿ 自由状态下活塞环型线探讨

# 自由状态下活塞环型线探讨Research on Piston Ring Lines under Free State

Abstract: For engine piston ring, the outer round degree and end gap size are the important parameters, so most of the manufacturing enterprises do full inspection to them. Current test methods are testing in ring gauge imitating piston ring in the cylinder liner working state. In order to improve the effi-ciency of the piston ring detection, people pay more attention to do test when engine piston ring is under free condition. According to the radial stress curve received by piston ring in the working state, with the condition of the invariant neutral axis before and after bend, the radial displacement and angle displacement of each point when engine piston ring returns to free condition from compression condition are deduced, and thus the piston ring lines of free condition under such pressure curve are obtained. Finally, we select a certain type of piston ring of a factory; according to the radial pressure distribution in working, parameters are set and simulated for the derived formulas in this paper; and the error analysis is made between the simulation results and the original image. The result shows that the simulation results and the original error are within the accuracy, so this method can be used to detect piston ring clearance and roundness.

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