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

Return space: Fix the output end and rotate the input end clockwise and counterclockwise to generate additional torque at the input end. When -2% torque occurs, there is a slight angular displacement at the input end of the reducer. This angular displacement is the return space. The unit is cents, which is one-sixtieth of a degree. Some people call it backlash.

Planetary reducer is an industrial product with a wide range of uses, with the price of an industrial-grade product, 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. The maximum input power can reach 104kW. It is suitable for use in lifting and transportation, construction machinery, metallurgy, mining, petrochemical, construction machinery, light industry textiles, medical equipment, instrumentation, cars, ships, swordsmen and aerospace and other industrial parts of the planetary series. Varieties: WGN fixed-shaft transmission reducer, WN sub-and-mother gear transmission reducer, elastic uniform load and small tooth difference reducer.