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一、前言我厂生产的7～9M~3自行式铲运机,经1000小时作业试验,发现功率输出箱输出轴疲劳断裂。该轴为台阶轴,其结构及主要尺寸见图1,除主要传递扭矩外,还承受一定的弯矩。这类轴在变速箱、加力箱以及功率输出箱中普
I. INTRODUCTION The 7～9M~3 self-propelled scraper produced by our factory has experienced 1000 hours operation test and found that the output shaft of the power output box is fatigue fractured. The shaft is a stepped shaft. The structure and main dimensions of the shaft are shown in Fig. 1. In addition to the main transmission torque, a certain bending moment is also accepted. This kind of shaft is in the transmission, power box and power output box.