尼龙嵌件锁紧螺钉连接的理论与设计方法

尼龙嵌件锁紧螺钉的连接是一种新型紧固件连接形式。通过分析计算、试验和应用实例探讨其防松机理和特点，并推导出拧紧力矩计算公式、尼龙块嵌件结构设计的经验公式，分析影响连接防松力矩的变化规律，最后给出在飞机设备上应用的一个实例。

THEORY AND DESIGN METHOD FOR LOCKING SCREWS WITH NYLON INSERT

The joint of locking screw with nylon insert is studied and the locking mechanism is analysed through experiment and an example of application. Then the calculation equation for tightening torque is deduced based on the experiment results. At last, empirical equations for the structure design of locking screw with nylon insert are presented and an example of application on air plane equipment is also given. The structure of a screw with nylon insert is that nylon is formed into cylinder or strip which is inserted into a hole in the thread portion of the screw. When the screw is tightened, the nylon in the screw is pressed and makes a resistant torque, when loosened, the screw must overcome this torque and thus is locked. The resistant torque prevents the loosening of a screw when the preload of the joint decreases or disappears.