The reducer is an independent component consisting of gear transmission, worm transmission and gear-worm transmission enclosed in a rigid shell. It is often used as a reduction transmission device between the prime mover and the working machine. The common types are:worm gear reducer，harmonic reducer，planetary reducer ，gear reducer

1. Worm gear reducer:The main feature of worm gear reducer is that it has reverse self-locking function, and it can have a large reduction ratio. The input shaft and output shaft are not on the same axis or plane. However, it is generally large in size, with low transmission efficiency and precision.

2. Harmonic reducer:The harmonic drive of harmonic reducer uses the controllable elastic deformation of flexible components to transmit motion and power, which is small in size and high in accuracy, but its disadvantages are limited life of flexspline impact resistance and poor rigidity compared with metal parts. The input speed cannot be too high.

3. Planetary reducer :The planetary reducer has the advantages of compact structure, small return clearance, high precision, long service life and large rated output torque. But the price is slightly more expensive.

4. Gear reducer:The gear reducer has the characteristics of small volume and large torque transmission. The gear reducer is designed and manufactured on the basis of modular combination system, which has many motor combinations, installation forms and structural schemes, and the transmission ratio is finely graded to meet different working conditions and realize electric integration. Gear reducer has high transmission efficiency, low energy consumption and superior performance.

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