What Is Worm Gear Reducer？

 

The Worm Gear Reducer is a common mechanical transmission device that achieves the functions of reducing speed, increasing torque and changing

 

the transmission direction through the meshing of the worm and the worm wheel. Its core feature is to utilize the sliding friction transmission between

 

the helical teeth of the worm and the helical teeth of the worm gear, which has a high reduction ratio and self-locking characteristics.

 

Main structure and working principle

Worm

 

A spiral-shaped shaft, usually an active input component, drives the worm gear to rotate when it rotates.

 

Single-head or multi-head design (the more heads there are, the higher the efficiency, but the reduction ratio decreases).

 

Worm Wheel

 

A gear with special helical teeth meshes with a worm and transmits motion to the output shaft.

 

It is usually made of bronze or cast iron to be wear-resistant and reduce friction.

 

Transmission principle

 

When the worm rotates one full circle, the worm gear turns one tooth (in the case of a single-ended worm). Therefore, the reduction ratio = the number

 

of teeth on the worm gear/the number of worm heads (for example: worm gear 40 teeth, single-ended worm → reduction ratio 40:1).

 

The transmission direction is usually staggered by 90° (the input and output shafts are perpendicular).

 

Core characteristics

High reduction ratio

 

A single stage can achieve a reduction ratio of 5:1 to 100:1, with a compact structure.

 

Self-locking property

 

When the lead Angle of the worm is less than the friction Angle, the reverse transmission is locked (the worm wheel cannot drive the worm), which is

 

suitable for scenarios that require anti-reverse rotation (such as cranes and elevators).

 

Smooth and low noise

 

Sliding friction transmission is quieter than gear meshing, but it is less efficient (usually 40% to 85%).

 

It has a strong load-bearing capacity

 

The contact area of the worm gear and worm is large, making it suitable for medium-load applications.