S Series Gearbox Self-Locking Function – What It Is and When You Need It

---

S Series Gearbox – Self-Locking Explained

What is self-locking?

When the worm lead angle is smaller than the friction angle between the worm and worm gear teeth, the gearbox prevents reverse rotation even when power is off. The load cannot back-drive the motor.

How it works

Worm gear transmission uses sliding friction

This friction creates a natural braking effect

Result: the output shaft locks when the motor stops

When do you need self-locking?

Manufacturer wholesale S series gearboxes self-locking, self-locking gearboxes, worm wheel self-locking, and reverse check gearboxes