自由状态下活塞环型线探讨

Research on Piston Ring Lines under Free State

摘要: 发动机活塞环的外圆圆度和闭口间隙是其重要的参数，大多数的生产企业都对其全检。目前检验方法都是模仿活塞环在缸套工作状态在环规内检验。为了提高活塞环检测的效率，在活塞环自由状态下进行检测受到人们重视而进行。本文根据工作状态时的活塞环所受到的径向压力曲线，以中性轴在弯曲前后保持不变作为条件，推导出活塞环从压缩状态恢复到自由状态时各点产生的径向位移和角位移，从而得出该种压力曲线下该环自由状态下的活塞环型线。最后，选取某工厂的某种类型的活塞环，根据工作时所对应的径向压力分布，对文中推导的公式进行参数设定，并进行了仿真，最后将仿真结果和原图进行了误差分析，结果显示，仿真结果和原图误差在准确度以内，即可以选用此方法来检测活塞环的闭口间隙和圆度。

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.