振动工况下的双螺母结构防松性能研究

Study on Anti-loosening Performance of Double Nut Joint Under Vibration Condition

双螺母结构应用广泛,正确拧紧的双螺母结构具有可靠的防松性能。通过有限元仿真和横向振动实验系统研究了双螺母上下螺母轴向力分配情况对防松性能的影响规律。研究结果表明,当双螺母结构在快要达到完全预紧状态时就能够起到很好的防松效果,在工程实际中为了保证防松性能,可以按照拧紧结束时双螺母结构达到完全预紧状态的轴向力分配比来确定拧紧工艺。

Double nut joint is widely used in some mechanical structures.It features reliable antiloosening performance when getting correct tightening.In this paper,the influence of the axial force distribution of the upper and lower nut on the anti-loosening performance is studied by the finite element simulation and the Junker test system.The research shows that the double nut joint will show a good anti-loosening performance when it reaches the complete locking state.Considering engineering practice,the tightening process can be determined by the axial force distribution ratio at the complete locking state.