为了对轮式装载机驱动桥进行抗疲劳设计和疲劳可靠性评估，在获得 ZL50G 轮 式装载机驱动桥输入轴实际工作扭矩载荷谱和转速统计的基础上，对驱动桥扭矩载荷谱 进行了等效疲劳强化处理和正反转加载疲劳试验，并对驱动桥进行了极小子样疲劳可靠 性评估． 结果表明: 驱动桥疲劳破坏主要发生在主减速器螺旋锥齿轮处，螺旋锥齿轮以弯 曲疲劳破坏形式为主; 轮边行星齿轮以接触疲劳破坏形式为主． 在给定工作寿命的条件 下，基于疲劳寿命试验结果的极小子样疲劳可靠性评估，获得了驱动桥工作时间与可靠度 的关系曲线．

: In order to design anti-fatigue and evaluate fatigue reliability of the wheel loading drive axle，the actual load torque spectrum and rotational speed statistics of the input axle of the ZL50G wheel loader drive axle have been obtained． Loading spectrum of intensified fatigue test，positive and reverse loading fatigue test and fatigue reliability evaluation of the wheel loading drive axle have been carried out． The results show that the fatigue failure of the driving axle occurs mainly in the spiral bevel gear of the main reducer，bending fatigue failure is the main form of spiral bevel gear and contact fatigue failure is the main form of wheel planetary gear． Under the condition of given working life，the relationship curve between the working time and reliability of the drive axle is obtained on the basis of very small sample fatigue reliability evaluation of the fatigue life test results．