Abstract: In evaluating the fatigue life of bearing seats using traditional static analysis methods, the influence of dynamic excitation from rollers on them is often overlooked. To overcome this limitation, based on bearing seats of a dual clutch transmission (DCT), this paper proposes an prediction innovative method of fatigue life analysis based on roller dynamic excitation. By establishing a full model of the transmission, and according to divide from the middle of the adjacent rollers arc length into four sub-models, combining the surplus and the actual loads at the working temperature, each sub-model's stress under working load is analyzed. The experimental load spectrum is converted into a fatigue load spectrum representing the excitation of the roller on the bearing seats. The fatigue damage of the bearing seats caused by a single cycle is analyzed, and the cumulative dynamic fatigue damage of the bearing seats is calculated. The research shows that this analysis method not only accurately predicts the fatigue life of the bearing seats in the transmission, but also provides strong technical support for the design optimization and reliability assessment of related components, which is of great significance for improving the performance and reliability of the transmission.

Key words: transmission; bearing seat; dynamic excitation; fatigue life; surplus

摘要： 传统静态分析方法在评估轴承座疲劳寿命时，往往忽视了滚子动态激励对其产生的影 响。为了克服这一局限性，文章基于某双离合变速器（DCT）轴承座，提出一种基于滚子动 态激励的疲劳寿命分析预测创新方法，通过建立变速器全模型，并根据等分相邻滚子弧长得 到四个子模型，结合工作温度下的过盈量和实际载荷，分析每个子模型在工作载荷下的应力， 将试验载荷谱转化为滚子对轴承座激励的疲劳载荷谱，分析滚子单次循环对轴承座的疲劳损 伤，并计算累计轴承座的动态疲劳损伤。研究表明，此分析方法不仅能够准确预测变速器轴 承座的疲劳寿命，还能为相关零部件的设计优化和可靠性评估提供强有力的技术支持，对于 提升变速器的性能和可靠性具有重要意义。

关键词: 变速器；轴承座；动态激励；疲劳寿命；过盈量