Transmission parameter is an important part of the transmission system. The transmission parameter determines the size of the headstock, the quality of the machine, the manufacturing cost and the lubrication conditions. lt is especial y important to fix a rational transmission parameter in a complete set of transmission system. High power and high torque are characteristic of the special 5000KN friction welding machine transmission system. Based on the principle of high power gear transmission being equivalent to the minimum moment of inertia, the transmission series are determined, and with the help of the entropy weight theory, the al ocation of transmission ratio is theoretical y optimized.%传动参数是传动系统的重要组成部分，传动参数直接关系到主轴箱尺寸的大小、整机质量、制造成本、润滑条件等，传动参数的合理确定在一套完整的传动系统中显得尤为重要。5000KN专用摩擦焊机传动系统具有功率大、扭矩大的特点。基于大功率齿轮传动等效转动惯量最小原则确定其传动级数，并借助于熵权理论，在理论上优化配置该摩擦焊机的传动比。
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