How to adjust the self-locking performance of NMRV030-30-63B14 worm gear reducer

The self-locking performance of NMRV030-30-63B14 worm gear reducer mainly depends on the relationship between the lead angle of the worm gear and the friction angle of the worm gear contact. When the lead angle of the worm gear is less than or equal to the equivalent friction angle, the mechanism has self-locking properties. The self-locking performance can be adjusted by the following methods:

Adjust the worm lead angle:

Reduce the number of worm heads: The fewer worm heads there are, the smaller the lead angle, and the easier it is to meet the self-locking condition. If the NMRV030-30-63B14 reducer is not originally a single head worm, it can be considered to replace it with a single head worm. The lead angle of a single head worm is usually 3 ° -6 °, which is the easiest to achieve self-locking.

Increasing the characteristic coefficient: The characteristic coefficient is related to the diameter of the worm indexing circle. Increasing the characteristic coefficient can reduce the worm lead angle, thereby improving the self-locking performance.

Optimize materials and lubrication:

Choose suitable materials: Use a combination of high friction coefficient materials, such as 20CrMnTi quenched worm gear with a hardness greater than 45HRC, and tin bronze ZCuSn10P1 worm gear, which can enhance self-locking performance.

Improving lubrication conditions: Using 320 grade worm gear special oil containing extreme pressure additives such as MoS, with a viscosity index greater than 90, can increase the friction coefficient and help enhance self-locking performance. At the same time, excessive lubrication should be avoided to prevent a decrease in friction coefficient due to excessive oil film thickness.

Control assembly accuracy: Adjust the axial clearance to 0.05-0.1mm during assembly to prevent reverse slip caused by looseness, ensure the meshing accuracy between the worm gear and worm, and help maintain self-locking performance.

Surface treatment: Nitriding treatment or spraying tungsten carbide coating on the surface of the worm can increase the friction coefficient by more than 20%, thereby enhancing the self-locking performance.