technical data Reducer Small Gear Motor technical data

About self-locking

In a worm reducer (Croise Motor), when the reducer's output shaft is turned while the reducer is stationary, the input shaft (motor shaft) will not start to rotate; this effect is called "self-locking." Also, the input shaft (motor shaft) will rotate, but a large force is required to turn the output shaft; this effect is called "self-locking" or "braking effect."

This "self-locking" effect is determined by the lead angle of the worm gear, the condition of the tooth surface, and the lubricant.

With our standard worm reducer (Croise Motor), if the reduction ratio of one stage of the worm gear is 1/60, you can expect a "self-locking" effect when stationary.

Other reduction ratios (1/10 to 1/50) are expected to provide "self-locking properties" and "braking effects."

However, the effectiveness of the "self-locking (automatic tightening)" may be reduced if shock or vibration is applied, so if reliable prevention of reverse rotation is required, we recommend that you always install a separate brake or similar device.

Furthermore, in applications where the load inertia is very large (traveling or turning devices, etc.), the self-locking and self-locking properties can cause sudden braking, which is extremely dangerous.

For such applications, select a worm gear reduction ratio of 1/10 to 1/20.