Concept of planetary reducer

Update:22 Jul 2020

Series: the number of planetary gears. Since a set of planetary gears can not meet a larger transmission ratio, sometimes two or three sets of planetary gears are required to meet the requirements against a larger transmission ratio. As the number of planetary gears is increased, the length of the 2-stage or 3-stage reducer will increase and the efficiency will decrease
Return clearance: when the output end is fixed and the input end is rotated clockwise and anticlockwise to produce the rated torque + - 2% torque, there is a small angular displacement at the input end of the reducer. This angular displacement is the return clearance. The unit is "minute", which is one sixth of one degree. It is also called back clearance
The main transmission structure of planetary reducer is: planetary gear, sun gear and outer gear ring
Due to the structural reasons, the minimum single-stage reduction of planetary gear reducer is 3, and the maximum is no more than 10. The common reduction ratio is, and the number of reducer stages is generally not more than 3, but there is local large reduction ratio. The customized reducer has 4-stage deceleration. Compared with other reducer, planetary reducer has high rigidity, high precision (single-stage can achieve less than 1 point), high transmission efficiency (single-stage is 97% - 98%), and high torque / volume ratio, Due to these characteristics, most planetary reducers are installed on stepper motors and servo motors to reduce speed, increase torque and match inertia. The maximum rated input speed of the reducer can reach 18000rpm (related to the size of the reducer, the larger the reducer, the smaller the rated input speed). The output torque of industrial planetary reducer generally does not exceed 2000Nm, The working temperature is between - 25 ℃ and 100 ℃, and the working temperature can be changed by changing the smooth grease.

The internal gear of planetary reducer is carburized, Quenched and grinded by 20cvmnt. It has the characteristics of small volume, light weight, high load capacity, long service life, stable operation, low noise, high output torque, high speed ratio, high efficiency and safe performance. It has the characteristics of power split and multi tooth meshing. It is a new reducer with universal applicability. The maximum input power can reach 104 kW. It is suitable for hoisting and transportation, engineering machinery, metallurgy, mining, petrochemical, construction machinery, light industry and textile, medical equipment, instruments and meters, automobile, ship, weapon, aerospace and other industrial sectors.

Shengzhou Star Electromechanical Manufacturing Co., Ltd.


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