根据游梁式抽油机曲柄销失效主要发生在曲柄销锥面中部台阶、螺纹根部及锥面小端台阶处，且均以弯曲疲劳破坏为主的特点，提出了曲柄销的弯矩计算方法，即按弹性地基油弹性极的计算模型求曲柄销各截面处的弯轻。采用这一计算方法，对曲柄销锥面小瑞台阶处和螺纹根部进行了疲劳强度设计。计算结果表明，曲柄销锥面小瑞台阶处和螺纹根部的工作安全系数分别为7．6和3．8，大于许用安全系数，均能满足疲劳强度要求。 According to the characteristic of crank fatigue failure, the crank pin failure of the beam pumping unit mainly occurs in the central step of the tapered surface of the crank pin, the root of the screw thread and the small end of the tapered surface. , That is calculated according to elastic base of the elastic base of the elastic modulus of the crank pin at each section of the bend light. Using this calculation method, fatigue strength design was carried out on the small rims of the crankpin and the root of the thread. The calculation results show that the working safety coefficient of the small rims on the tapered surface of the crankpin and the root of the thread are 7.6 and 3.8, respectively, which is larger than the allowable safety factor to meet the fatigue strength requirements.