A worm gear reducer is a mechanical device that achieves speed reduction through the meshing of a worm and a worm wheel.

　　A worm gear reducer is a mechanical device that achieves speed reduction through the meshing of a worm and a worm wheel. Its main features include:

　　Large reduction ratio: Worm gear reducers can achieve substantial reduction ratios, typically ranging from 10 to several hundred, making them particularly well-suited for applications requiring high gear reductions.

　　Compact structure: Due to the meshing arrangement of the worm and worm gear, worm gear reducers typically feature a small footprint and light weight, making them easy to install and operate.

　　Smooth transmission: The worm gear reducer offers a relatively smooth transmission process, with low vibration and noise, making it suitable for applications with stringent environmental requirements.

　　Self-locking: Some worm gear reducers feature a self-locking capability—specifically, when the lead angle of the worm is smaller than the equivalent friction angle between the worm and the worm wheel teeth, the reducer exhibits reverse self-locking, effectively preventing the machine from backdriving or reversing.

　　Worm gear reducers are widely used in industries such as metallurgy, mining, lifting, transportation, cement, construction, chemical processing, textiles, printing and dyeing, and pharmaceuticals.

　　Pendulum reducer

　　A harmonic drive, also known as a harmonic gear reducer, is a mechanical device that achieves speed reduction through the meshing of a harmonic gear set. Its key features include:

　　Large reduction ratio: Harmonic drive reducers can also achieve a high reduction ratio, making them suitable for applications requiring precise control.

　　High transmission efficiency: The harmonic drive reducer boasts high transmission efficiency, minimizing energy losses and enhancing equipment performance.

　　Strong load-carrying capacity: The pendulum‑pin reducer features a well‑designed structure that can withstand substantial radial and axial loads, making it suitable for heavy‑duty operating conditions.

　　Smooth Operation: The pendulum‑type reducer features a smooth transmission process, with minimal vibration and noise, delivering stable performance.

　　Internal structure

　　A worm gear reducer primarily consists of the following key components:

　　Worm gear: As the core transmission component of a reducer, the worm gear is typically made of low-hardness cast iron or copper and has the shape of a cylindrical helical gear. Its tooth grooves are designed to match the helical protrusions of the worm, enabling efficient power transmission.

　　Worm: The worm is the primary transmission component of a reducer, typically manufactured from high-strength alloy steel and offering excellent wear resistance and corrosion resistance. It has a long, helical shape, with its helical ridges meshing with the teeth of the worm wheel to transmit power.

　　Bearings: In a gearbox, bearings serve to support and secure components, primarily bearing the worm wheel and worm shaft, thereby reducing friction and wear during operation. Common bearing types include rolling bearings and plain bearings; the choice should be determined based on the gearbox’s load requirements and operating environment.

　　Oil seals: Oil seals are sealing components of gear reducers, designed to prevent lubricant leakage and ensure that the internal lubricant remains clean and adequately supplied. Typically made from rubber or metal, they offer excellent sealing performance and wear resistance.

　　Housing: The housing is typically made of aluminum alloy or cast iron, serving to secure and protect the internal transmission components. It is bolted to a base or bracket to mount and support the entire gearbox.

　　Lubrication System: The lubrication system is essential for the proper operation of a gearbox. It typically comprises lubricating oil or grease, which provides lubrication between high-speed transmission components to reduce friction and wear. There are two primary lubrication methods: grease lubrication and circulating lubrication.

　　Principle of motion

　　The operating principle of a worm gear reducer is primarily based on frictional transmission between the worm and the worm wheel. When the motor drives the worm to rotate, the helical threads of the worm engage with the teeth of the worm wheel, and power is transmitted to the worm wheel via friction. Because the tooth‑count ratio between the worm and the worm wheel—defined as the number of teeth on the worm wheel divided by the number of starts on the worm—is relatively large, the worm wheel experiences a significant reduction in rotational speed while receiving torque, thereby achieving a deceleration effect.

　　Specifically, when the worm rotates, its helical ridge slides along the worm gear’s tooth grooves, driving the worm gear to turn. Due to the precise relationship between the worm’s helix angle and the number of teeth on the worm gear, the worm can only rotate by a limited angle—typically less than one full revolution—for each complete rotation of the worm gear. This design not only achieves a reduction in speed but also endows the worm‑gear reducer with a degree of self‑locking: once the worm ceases to rotate, the frictional forces and the geometric configuration between the worm and worm gear typically prevent the worm gear from reversing spontaneously.