What is a planetary reducer?

Introduction: Planetary is an industrial transmission designed to increase the output torque of the system by reducing the speed. The main transmission structure of the planetary reducer is: planetary gear, sun gear and external ring gear.

What is a planetary reducer? What does planetary reducer mean?

A planetary is an industrial transmission designed to increase the output torque of a system by reducing speed. The main transmission structure of the planetary reducer is: planetary gear, sun gear and external ring gear.

Due to the structure of planetary reducer, the minimum single-stage reduction is 3, generally not more than 10, the common reduction ratio is: 3.4.5.6.8.10, the number of reducer stages generally does not exceed 3, but some large reduction ratio custom reducers have 4 stage deceleration.

Compared with other reducers, planetary reducers have high rigidity, high precision (single-stage can be achieved within 1 minute), high transmission efficiency (single-stage at 97%-98%), high torque/volume ratio, lifetime maintenance-free, etc. Features.

Because of these characteristics, planetary reducers are mostly installed on stepper motors and servo motors to reduce speed, increase torque, and match inertia.

The rated input speed of the reducer can reach 18000rpm (related to the size of the reducer itself, the larger the reducer, the smaller the rated input speed). The output torque of the industrial-grade planetary reducer generally does not exceed 2000Nm, and the special super-torque planetary reducer can be used for to more than 10000Nm. The working temperature is generally around -25°C to 100°C, and the working temperature can be changed by changing the grease.

Several concepts about planetary reducer:

Number of stages: the number of sets of planetary gears. Since one set of star gears cannot meet the larger transmission ratio, sometimes 2 or 3 sets are needed to meet the requirements of supporting the larger transmission ratio. Due to the increase in the number of star gears, the length of the 2- or 3-stage reducer will increase and the efficiency will decrease.

Return clearance: When the output end is fixed, the input end rotates clockwise and counterclockwise, so that when the input end generates the rated torque +-2% torque, the input end of the reducer has a slight angular displacement, and this angular displacement is the return clearance. The unit is "cent", which is one-sixtieth of a degree, which is also called backlash.

Planetary reducer is a widely used industrial product. Its performance is comparable to other military-grade reducer products, but it has the price of industrial-grade products and is used in a wide range of industrial occasions.

The reducer is small in size, light in weight, high in carrying capacity, long in service life, stable in operation and low in noise. It has the characteristics of power splitting and multi-tooth meshing. Input power can reach 104kW. It is suitable for lifting and transportation, construction machinery, metallurgy, mining, petrochemical industry, construction machinery, light industrial textiles, medical equipment, instrumentation, automobiles, ships, weapons and aerospace and other industries. New varieties of planetary series WGN fixed shaft drive reducers , WN mother-in-law gear drive reducer, elastic load-sharing less tooth difference reducer.

Planetary reducer is a new type of reducer with wide versatility. The internal gears are carburized, quenched and ground by 20CvMnT. The whole machine has the characteristics of small structure size, large output torque, high speed ratio, high efficiency, safe and reliable performance and so on. This machine is mainly used for the slewing mechanism of tower cranes, and can also be used as a supporting component for lifting, excavation, transportation, construction and other industries.

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