Principle of harmonic reducer

The harmonic reducer is composed of four basic components: "flexible wheel, wave generator, rigid wheel, and bearing". The outer diameter of the flexible wheel is slightly smaller than the inner diameter of the rigid wheel. Generally, the flexible wheel has 2 teeth less than the rigid wheel. The elliptical shape of the wave generator determines that the tooth contact points of the flexible wheel and the rigid wheel are distributed on two opposite surfaces between the center of the ellipse. During the rotation of the wave generator, the contact parts of the flexible gear and the rigid gear start to mesh. Every time the wave generator rotates 180° clockwise, the flexspline is equivalent to a counterclockwise rotation of the rigid wheel by 1 tooth number difference. In two places symmetrical at 180°, more than 30% of the total number of teeth are meshed at the same time, which also contributes to its high torque transmission.

Principle of RV gear reducer

Compared with the harmonic reducer, the precision cycloid RV gear transmission is a new type of transmission. It is developed on the basis of the traditional pin pendulum planetary transmission. It not only overcomes the shortcomings of the general pin pendulum transmission, but also has a small size. , Light weight, wide transmission ratio range, long service life, stable precision, high efficiency, stable transmission, etc. A series of advantages.

Advantages of RV grar reducer

The key to the precision cycloid RV gear reducer lies in the processing technology and assembly technology. The precision cycloid RV gear reducer has higher fatigue strength, stiffness and life. Unlike the harmonic drive, as the use time increases, the motion accuracy will be significantly reduced. Its disadvantage is that it is heavy in weight and large in size.

It is reported that the precision cycloid RV gear reducer is composed of a cycloidal pin wheel and a planetary carrier. It is widely used for its small size, strong impact resistance, large torque, high positioning accuracy, small vibration, and large reduction ratio. Industrial robots, machine tools, medical testing equipment, satellite receiving systems, and other fields have increasingly received widespread attention at home and abroad.

The harmonic reducer has a simple and compact structure and is suitable for miniaturized, low and medium load applications.

The precision cycloid RV gear reducer has good rigidity, strong impact resistance, stable transmission, and high precision. It is suitable for medium and heavy load applications. However, the RV reducer needs to transmit a large torque and withstand a large overload impact to ensure the expected Working life, therefore, a relatively complicated over-positioning structure is used in the design, and it is difficult to control the manufacturing process and cost.

As an important component of core components, precision reducers are an indispensable part of reliable and accurate operation of industrial robots. In fact, there are many types of reducers, namely, harmonic gear reducer, cycloid planetary reducer, RV reducer, precision planetary reducer and filter gear reducer.

Application of RV reducer in industrial robot

As a precision reducer, which is the core component of industrial robots, compared with general-purpose reducers, robot reducers are required to have the characteristics of short transmission chain, small size, high power, light weight and easy control. The precision reducer enables the robot 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: precision cycloid RV gear 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 10 kg; and the harmonic reducer is placed on the forearm, wrist or hand, that is, Robot joints under 10 kg. In addition, planetary reducers are generally used in Cartesian coordinate robots.

The development opportunities brought by China’s manufacturing of core components represented by precision reducers,

The first stage: Chinese manufacturing of parts and components drives cost reductions and stimulates downstream demand. The core components made in China will directly reduce the production costs of downstream industrial robot body manufacturers. Taking the reducer as an example, the price of China's precision cycloid RV gear reducer is about 40% lower than that of Japan's precision cycloid RV gear reducer. This is reflected in the cost of the industrial robot body, that is, there is about 10% room for drop. The reduction in the cost of industrial robots will shorten the payback period of the investment in the transformation of downstream industrial automation production equipment, thereby opening the door to demand.

The second stage: the development of industrial robot body demand, the improvement of scale efficiency, and the promotion of the development of precision cycloid RV gear reducer.

If you need to purchase or consult, learn more about the precision cycloidal pinwheel RV gear reducer, please feel free to consult and contact sales@geniusrobotics.cn,

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