What Is The Self-Locking Property of Trapezoidal Lead Screws?

Because of the thread profile characteristics of trapezoidal lead screw,So the spiral Angle 入of different specifications screw is not the same,and the equivalent friction coefficient fv between screw nuts of different materials is also different.Then apply a positive pressure F to the nut at the rated load,The screw and nut cannot slip when the helix Angle 入 is less than the equivalent friction Angle R,this condition called self-locking of lead screw.

In the vertical lifting system,the lead screw with self-locking does not need to be equipped with additional locking device,which provides a higher safety factor when the motor stalls,and provides more selection schemes for designers in terms of functions.