What is Difference Between Harmonic Reducer and RV Reducer?

Harmonic reducer and RV reducer are two common types of reduction devices used in industrial machinery. Although they are both used for reducing speed and transmitting power, there are some important differences between them in terms of structure and working principles.
 
Firstly, the harmonic reducer adopts the principle of harmonic transmission, which consists of flexible gears, rigid gears, and a wave generator. Harmonic transmission achieves power transmission by bending and twisting the flexible gears. In contrast, the RV reducer uses the principle of planetary gear transmission, which consists of planetary gears, sun gears, and ring gears. Power transmission is achieved by rotating the sun gears and ring gears with the planetary gears.
 
Secondly, the transmission efficiency of harmonic reducer and RV reducer also differs. The transmission efficiency of the harmonic reducer is usually above 90%, while the transmission efficiency of the RV reducer is usually above 95%. This is because the flexible gears in the harmonic reducer cause certain energy losses.
 
In addition, the torque and precision of the harmonic reducer and RV reducer are also different. The harmonic reducer usually has a higher torque density and can withstand larger torque loads. However, due to the uniqueness of its structure, the precision of the harmonic reducer is lower, usually within a few arc minutes. In comparison, the RV reducer has higher precision, usually within a few arc seconds, but lower torque density.
 
Finally, the harmonic reducer and RV reducer also differ in terms of lifespan and maintenance. The harmonic reducer has a longer lifespan, typically exceeding 20,000 hours, and requires relatively simple maintenance. On the other hand, the RV reducer has a shorter lifespan, typically around 10,000 hours, and requires regular lubrication and maintenance.
 
In conclusion, there are some important differences between the harmonic reducer and RV reducer in terms of structure, working principles, transmission efficiency, torque and precision, lifespan, and maintenance. The choice of which reducer to use depends on the specific requirements and conditions of the application.