过渡圆角及重迭度对球铁曲轴弯曲疲劳强度的影响

Effect of Transition Fillet and Overlapping Degree on Bending Fatigue Strength of Nodular Cast Iron Crankshaft

为提高曲轴的弯曲疲劳强度，对曲轴进行了两方面的改进：一是加大了曲轴主轴颈及连杆轴颈的过渡圆角；二是在加大过渡圆角的基础上增大了曲轴主轴径。曲轴弯曲疲劳强度对比试验结果表明，这两种改进都增加了曲轴的承载能力。

In order to improve bending fatigue strength, the crankshaft is impeved by two ways: .one is by increasing the transition fillet of crankshaft main journal and connecting rod journal;the other is by increasing the sizeof crankshaft main journal based on the increase of transition fillet. Conclusions of the contrast tests show that twoimprovement can raise the load-supporting ability.