一、计算公式确定传动轴的尺寸是一个普通的设计问题。一般说来,传动轴所传递的扭矩是不变的,或者是周期性变化的。在轴上安装齿轮、皮带轮或轴承的部位还存在着一个或多个径向载荷。因为径向载荷的方向是固定不变的,所以每当轴转一圈时,由径向载荷产生的弯曲应力在全拉应力与全压应力之间变化。因此,材料疲劳最有可能成为动力传动轴损坏的原因。实验结果表明,扭矩不变时,可采用曲线拟合法使弯曲应力、剪应力、弯曲疲劳极限和 First, the formula to determine the size of the drive shaft is a common design problem. In general, the torque transmitted by the drive shaft is constant or periodically changing. There are also one or more radial loads on the shaft where the gears, pulleys, or bearings are mounted. Because the direction of the radial load is constant, the bending stress due to the radial load varies between the full tensile stress and the total compressive stress each revolution of the shaft. Therefore, material fatigue is most likely to be the cause of damage to the power transmission shaft. The experimental results show that when the torque is constant, the curve fitting method can be used to make the bending stress, the shear stress, the bending fatigue limit and