关键词: 车桥；花键；扭断；疲劳寿命

Abstract: In order to improve the torque limit of spline usage and reduce the risk of spline shaft torsion and fracture under high torque, a verification method combining theoretical calculation and experimentation is proposed. Firstly, according to the theoretical formula, the program is written to calculate the strength of the spline and the fatigue life of the shaft torsion. The spline life is combined with the fatigue life of the shaft torsion for verification, and the design meets the requirements of the load spectrum. Then, the torsional fatigue limit torque of the axle shaft head is explored, and the metallographic structure, hardness, and material composition of the spline section are analyzed to verify that the spine shaft material is qualified. This article proposes for the first time to consider spline shafts as shaft components with shaft shoulders. The research results provide a basis for product structural design and improvement, and have important reference value.

Key words: axle; spline; torsion and fracture; fatigue life