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分析了WK－4型挖掘机行走主动轴花键联接部位断裂的原因，提出了以方形型面联接取代花键联接的设想，分析了有关应力.
The reason of splitting of spline joint of driving spindle of WK-4 excavator was analyzed. The idea of replacing spline joint with square profile joint was put forward, and the related stress was analyzed.