关键词: 变速器；轴承座；动态激励；疲劳寿命；过盈量

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