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What is the difference between planetary reducer, RV reducer and harmonic reducer?

What is the difference between planetary reducer, RV reducer and harmonic reducer? 1. planetary reducer is an industrial product. Planetary reducer is a transmission mechanism. Its structure is closely combined with an internal gear ring on the gear box housing. The center of the ring gear has a sun gear driven by external power. Between the two, there is a group of planetary gear sets composed of three gears on the tray, this group of planetary gears relies on the output shaft, internal gear ring and sun gear support to float during the period. When the power on the input side drives the sun gear, it can drive the planetary gear to rotate and follow the trajectory of the internal gear ring to revolve along the center. The rotation of the planet drives the output shaft connected to the tray to output power. A mechanism that uses a gear speed converter to reduce the number of revolutions of the motor (motor) to the desired number of revolutions and obtain a larger torque. In the reducer mechanism used to transmit power and motion, the planetary reducer is a precision reducer, such as PGM planetary reducer of Shenzhen Dongma Electromechanical, Hubei planetary reducer, etc. The reduction ratio can be accurate to 0.1 rpm -0.5 r/min minutes. 2. RV transmission is a new type of transmission. It is developed on the basis of traditional needle pendulum planetary transmission. It not only overcomes the shortcomings of general needle pendulum transmission, but also has a series of advantages such as small size, light weight, large transmission ratio range, long service life, stable precision, high efficiency, stable transmission and so on. increasingly widespread concern at home and abroad. RV reducer is composed of cycloid pin wheel and planetary bracket with its small size, strong impact resistance, large torque, high positioning accuracy, small vibration, large reduction ratio and many other advantages are widely used in industrial robots, machine tools, medical testing equipment, satellite receiving systems and other fields. Compared with the harmonic drive commonly used in robots, it has much higher fatigue strength, stiffness and life, and the return difference accuracy is stable. Unlike harmonic drive, the movement accuracy will be significantly reduced with the increase of use time. Therefore, RV reducer is mostly used in high-precision robot drive in many countries in the world. Therefore, this kind of RV reducer has the development trend of gradually replacing harmonic reducer in advanced robot drive. 3. harmonic reducer is mainly composed of three basic components: wave generator, flexible gear and rigid gear. Harmonic transmission reducer is a kind of controllable elastic deformation of flexible gear by wave generator and meshing with rigid gear to transmit motion and power. Planetary reducer, RV reducer, and harmonic reducer have different working principles, different transmission methods, and different application industries

Factors Affecting the Life of Harmonic Reducer

There are many factors that affect the life of the reducer, and the gear in the harmonic reducer is the key. First of all, the choice of gear material of harmonic reducer: the gear should be selected according to the working conditions of use. The choice of gear material has a direct impact on the processing performance and service life of the gear. General gear selection of carbon steel (such as 45 steel) and low and medium carbon alloy steel, such as 20Cr, 40Cr, 20CrMnTi and so on. 38CrMoAlA nitrided steel can be used for important gears with higher requirements, and materials such as cast iron, bakelite or nylon can also be used for non-transmission gears. Secondly, the heat treatment of gears, gear processing according to different purposes, arrange two heat treatment processes: 1) Blank heat treatment: in the tooth blank processing before and after the arrangement of pre-heat treatment normalizing or quenching and tempering, the main purpose is to eliminate. In addition to the residual stress caused by forging and rough machining, the machinability of the material is improved and the comprehensive mechanical properties are improved. 2) tooth surface heat treatment: after tooth profile processing, in order to improve the hardness and wear resistance of the tooth surface, often carburizing quenching, High-frequency induction heating quenching, carbon-nitrogen co-penetration and nitrogen seepage and other heat treatment processes. Third, the gear blank: the gear blank form is mainly bar, forgings and castings. Bar stock for small size, A gear with a simple structure and low requirements for strength. When the gear requires high strength, wear resistance and impact resistance, multi-use forging Parts, the diameter is greater than 400~600mm gear, commonly used casting blank. In order to reduce the amount of mechanical processing, the large Size, low precision gear, can be directly cast out of the gear teeth; for small size, complex shape of the gear, available fine New processes such as dense casting, pressure casting, precision forging, powder metallurgy, hot rolling and cold extrusion to manufacture wheels. The tooth blanks of the teeth are used to improve labor productivity and save raw materials.

Shenzhen Honghui Technology Hollow Harmonic Reducer Structure Theory

With the development of intelligent equipment manufacturing industry, China has become the world's largest industrial robot market for four consecutive years. As the core components of the robot precision reducer market demand is huge. The hollow harmonic gear reducer has the advantages of compact structure, high transmission accuracy and convenient for the internal threading of the robot, so it is widely used in the field of robot, but the design and research of its performance parameters are relatively scarce. To this end, the paper takes the hollow top hat type harmonic gear reducer as the research object, studies and analyzes the parameter design and optimization method of this type of harmonic drive. Firstly, according to the design criteria and empirical formula of harmonic drive, referring to the existing top hat type harmonic drive structure, the paper preliminarily designs the structural parameters of the hollow top hat type harmonic drive, and determines the value range of the main structural parameters of the flexible wheel, the rigid wheel involute tooth profile that meets the requirements of meshing accuracy is obtained by solving the simplified fitting approximation optimization algorithm, and the rigid-flexible wheel meshing motion is simulated by matlab to analyze the meshing performance of the rigid-flexible wheel. Then, the causes of the deflection of the flexible wheel teeth under the action of the wave generator and its influence on the meshing of the rigid-flexible wheel teeth are discussed, using ABAQUSE software to analyze the stress distribution of the top-hat flexspline under no-load and load conditions, to determine the position of the maximum stress, to study the degree of influence of the main structural parameters of the top-hat flexspline on the maximum stress of the flexspline through orthogonal test, and to optimize the structural parameters of the top-hat flexspline using ISIGHT software to obtain the structural parameters with the minimum maximum stress under no-load and load conditions.

Harmonic Reducer-Changing the World of Motion Control

Due to the outstanding advantages of harmonic gear transmission in practical use, in recent decades, this transmission has been applied in aerospace vehicles and aircraft, and has been rapidly promoted to energy, radar, communications, machine tools, instrumentation, shipbuilding, automobiles, Conventional weapons, textiles, metallurgy, lifting transporters, medical equipment and other related departments.

Ma Kai: Accelerate the transformation from a big raw material country to a strong raw material country

Ma Kai, State Councilor and Secretary General of the State Council, stressed at the "high level forum on promoting aluminum application" on the 25th that it is necessary to thoroughly implement the scientific outlook on development, explore and grasp the development law of raw material industry with global vision, strategic thinking and long-term vision, effectively transform the development mode of China's raw material industry, and accelerate the transformation from a big raw material country to a strong raw material country.

Manufacturing: the strongest focus of Sino-US competition

After Trump is elected president of the United States, the competitive situation between China and the United States will change significantly, even fundamentally.