以传动比分配与确定作为带传动、齿轮传动设计的主线,以润滑方式选择作为轴和轴上零件结构设计的前提,以键的选择和轴承寿命计算作为轴结构尺寸的设计依据,以力的叠加原理作为轴强度校核、轴承寿命计算中方向未知力的处理是机械零件课程设计的常用原则。 With transmission ratio distribution and determination as the main line of belt transmission and gear transmission design, the choice of lubrication mode is taken as the prerequisite for the structural design of shaft and shaft parts. The key selection and bearing life calculation are taken as the design basis of the shaft structure size, Superposition principle as the axial strength check, the calculation of bearing life in the direction of the unknown force is the common principle of mechanical parts course design.