对于球墨铸铁曲轴来说,除了要保证被结构应力集中点(圆根和油孔)削弱的截面的抗弯强度和抗扭强度外,还要保证与曲柄臂端面连接的轴颈铸造内腔区域的强度。根据以前所进行的工作已知:当曲轴受扭矩作用时,曲柄臂在其自身平面内经受弯曲变形,当曲轴尺寸比例不合适时,其疲劳则可能取决于曲柄臂内 For ductile iron crankshaft, in addition to the structural stress concentration points (round root and oil hole) weakened cross-section of the bending strength and torsional strength, but also ensure that the crank arm end face connected to the casting cavity region Strength of. It has been known from previous work that when the crankshaft is subjected to torque, the crank arm is subjected to bending deformation in its own plane, and when the crankshaft dimension ratio is not suitable, its fatigue may depend on the inside of the crank arm