组合变形是机械传动轴的主要变形形式。如齿轮轴(见图1)和皮带轮传动轴(见图2),两集中力(轴承座的支反力可视为集中力)之间的合成弯矩图如图3所示,AB段和CD段为斜直线,BC段为凹向曲线。在许多材料力学教材中(见注,参考文献[1]、[2]、[3]),都给出这样的结果(此结果对确定危险截面极为方便),但未给出其证明或较充 Combination of deformation is the main deformation of mechanical transmission shaft. Such as the gear shaft (see Figure 1) and the pulley drive shaft (see Figure 2), two concentrated force (bearing the reaction can be regarded as concentrated force) between the moment diagram shown in Figure 3, AB and CD segment is oblique straight line, BC segment concave curve. This result is given in many textbook materials (see note, references [1], [2], [3]), which is extremely convenient for determining the dangerous cross section but does not give any evidence of it Charge