某轻型履带车辆起步工况下主离合器接合过程传动轴疲劳损伤研究

This paper tries to figure out the fatigue damage of transmission shaft of transmission system caused by the engagement of main clutch under typical operating conditions, and then analyze the main factors causing the fatigue damage of transmission system. A dynamic model of vehicle starting is built to obtain the relationship between the vehicle transmission system load and the engagement displacement value of main clutch. A testing platform of tracked vehicle is built to get the test data of transmission system under typical operating conditions. The dynamic tests of stepper engagement of main clutch are designed to collect the torque data transmitted by the transmission system in the process of main clutch engagement. Finally, the rain-flow counting method and rain-flow filtering method are used to process the original data, and then the linear fatigue cumulative damage theory is used to calculate the fatigue damage of transmission shaft in transmission system to determine the engaging state of main clutch when the maximum fatigue damage is caused to the transmission system. The results show that the displacement point at which the axial moving speed of the driven plate changes the most is the danger point when the maximum fatigue damage is caused to the transmission shaft, which is accounted for 73.86% of the total damage, and the damage degree is 2.87 times of the main clutch fully synchronized state.