工程机械工作环境恶劣,冲击负荷频繁。因此,各重要部件的螺栓联接,必须有足够的予紧力。但予紧力过大,又可能使螺栓在装配过程中或偶然过载的情况下被拉断。为此,本文对工程机械常用螺栓的拧紧力矩进行初步探讨。螺栓的拧紧力矩等于螺纹副中的拧紧力矩M_1和螺母环形端面与支承面间的摩擦阻力矩 The working environment of construction machinery is harsh and the impact load is frequent. Therefore, the bolt connection of important parts must have sufficient pre-tension. However, if the tension is too large, it may cause the bolt to be broken during assembly or accidental overload. For this reason, this paper discusses the tightening torque of common bolts for construction machinery. The tightening torque of the bolt is equal to the tightening torque M_1 in the thread pair and the frictional resistance moment between the annular end face of the nut and the bearing surface