Generally, the working principle of the lock nut is self-locking by the friction between the nut and the bolt. However, the reliability of this self-locking under dynamic load will be reduced. In some important occasions, we will take some anti-loosening measures to ensure the reliability of the nut locking. The use of a lock nut is one of the anti-loosening measures.
There are also two types of lock nuts. One is to use two identical nuts to be screwed on the same bolt, and a tightening torque is added between the two nuts to make the bolt connection reliable. The other is a special lock nut, which needs to be used together with a lock washer.
The special lock nut is not a hexagonal nut, but a middle round nut. There are 6 notches on the circumference of the nut. These six notches are not only the focus point of the tightening tool, but also the insertion point of the lock washer bayonet. . The second anti-loose method is more reliable than the first, but the structure is relatively complicated. But the lock nut used on the ball screw has higher requirements. The special feature of this lock nut is the three phosphor bronze lock pins evenly distributed on the circumference. These lock pins are pressed on the shaft by the hexagon socket flat head screw. On the screw, the installation and design to prevent the nut from rotating are very simple. No additional lock washers or grooves in the shaft are required. The angle between the locking pin and the grub screw and the axis is the same as that of the thread. The end of the locking pin and the thread are processed in one process, so it also has a thread profile. The nut is completely locked in place by the friction between the locking pin and the shaft thread and the friction between the threads.
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