两级载荷作用下城轨列车传动齿轮弯曲疲劳寿命预测

Gear bending fatigue has an important impact on the safe operation of urban railway vehicles. According to the load characteristics of urban railway vehicles, this paper establishes a gear fatigue life prediction model suitable for urban railway vehicles. By analyzing the gear load characteristics of the actual operation condition of urban rail vehicles, and combining the cumulative load frequency of the driving gear, the two-stage load is determined; using the two-level stress ratio as the damage parameter, the bending fatigue test and life prediction of urban rail train gears are carried out. The research results show that the fatigue life of the gear under two-stage load is significantly lower than that under a single load. By comparing the prediction results of the fatigue life prediction model proposed in this paper with the test data, it is found that the fatigue life prediction model established in this paper can predict the bending fatigue life of gears more accurately.