Comparative analysis of RV reducer and harmonic reducer of industrial robot

Comparative analysis of RV reducer and harmonic reducer of industrial robot
As an important component of core components, precision reducers are an indispensable part of the reliable and precise operation of industrial robots. In fact, there are many types of reducers, namely, harmonic gear reducers, cycloid planetary reducers, RV reducers, precision planetary reducers and filter gear reducers.
As a precision reducer, the core component of industrial robots, compared with general-purpose reducers, the reducer for robots requires the characteristics of short transmission chain, small size, high power, light weight and easy control. The precision reducer enables the robot's servo motor to run at a suitable speed, and accurately reduces the speed to the speed required by each part of the industrial robot, which improves the rigidity of the mechanical body while outputting greater torque.

There are two main types of reducers widely used in articulated robots: RV reducers and harmonic reducers. Generally, the RV reducer is placed on the machine base, boom, shoulder and other heavy loads, that is, it is mainly used for robot joints over 20 kg; and the harmonic reducer is placed on the forearm, wrist or hand, that is, Robot joints under 20 kg. In addition, planetary reducers are generally used on Cartesian robots.
Compared with the harmonic reducer, the RV drive is a new type of transmission. It is developed on the basis of the traditional pin pendulum planetary drive. It not only overcomes the shortcomings of the general pin pendulum drive, but also has small size, light weight, and A series of advantages such as large transmission ratio range, long life, stable accuracy, high efficiency, and smooth transmission.

The key to the RV reducer is the processing technology and assembly technology. RV reducer has higher fatigue strength, rigidity and lifespan. Unlike the harmonic drive, as the use time increases, the movement accuracy will be significantly reduced. Its disadvantage is that it is heavy in weight and large in size.

It is reported that the RV reducer is composed of a cycloidal pin wheel and a planetary support. It is widely used in industrial robots and machine tools with many advantages such as small size, strong impact resistance, large torque, high positioning accuracy, low vibration, and large reduction ratio. , Medical testing equipment, satellite receiving systems, etc., are increasingly receiving extensive attention at home and abroad.

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