主减速器橡胶密封圈性能衰减模型及日历寿命评估

目的 构建主减速器橡胶密封圈储存/装机条件下的性能衰减模型，评估其实际储存日历寿命、储存/装机条件下的折算系数。方法 将功能结构件实际尺寸（实际装配、初始轴向厚度和压缩时轴向厚度）、实际生产产品尺寸和安全裕度相结合，确定橡胶密封件的失效判据。对实际使用的FX-4、FX-17橡胶密封圈2种初始压缩率的装机状态下进行5个温度点的加速老化试验，测定2种橡胶密封圈压缩永久变形率的老化指标参数，利用回归分析得到相应的衰减模型，结合实际储存13a的橡胶密封圈的压缩永久变形率进行检验，确定储存/装机条件下的折算系数。结果 以25%为失效判据，橡胶密封圈储存年限可达19.8 a。结论 为了保证使用安全和外场计算方便，FX-4密封圈装机使用1 a相当于储存2 a,FX-17密封圈装机使用1 a相当于储存3 a。

Performance Attenuation Model and Calendar Life Evaluation for Rubber Seal Ring of Main Reducer

The work aims to establish the performance attenuation model for the rubber seal ring of the main reducer under storage/installation condition to evaluate its calendar life in actual storage and conversion coefficient under storage/installation condition. According to the actual size of the functional structure (actual assembly, initial axial thickness and axial thickness during compression), the actual product size and the safety margin, the failure criterion of rubber seals was determined. Accelerated aging tests at 5 temperature points were carried out to the actually used FX-4 and FX-17 rubber seal rings under the installation and at two initial compression rates. The aging parameters of the two rubber seal rings under the permanent compression deformation rate were determined. Then, the attenuation model was obtained by regression analysis. The permanent compression deformation rate of rubber seal ring after storage for 13 years was adopted to test the model and determine the conversion coefficient under storage/installation. With 25% as failure criterion, the calendar life of rubber seal ring could reach 19.8 years. In order to ensure the safe use and convenient field calculation, the use of FX-4 seal ring under installation for 1 year is equivalent to storage for 2 years and the use of FX-17 seal ring under installation for 1 year is equivalent to storage for 3 years.