The main transmission structure of planetary gearbox is: planetary wheel, solar wheel, outer ring gear.
Planetary gearbox because of structural reasons, the minimum single-stage deceleration is 3, the maximum is generally not more than 10, the common deceleration ratio is: 3.4.5.6.8.10, the number of gearbox stage generally does not exceed 3, but some large deceleration than custom reducer has 4-stage deceleration.
Compared with other gearboxes, planetary gearboxes are characterized by high rigidity, high precision (a single stage can be done within 1 point), high transmission efficiency (single stage at 97%-98%), high torque/volume ratio, and lifelong maintenance-free.
Because of these characteristics, planetary gearboxes are mostly mounted on stepper motors and servo motors to reduce speed, lift torque, and match inertia.
The rated input speed of the gearbox can reach up to 18000rpm (related to the size of the gearbox itself, the larger the gearbox, the smaller the rated input speed), the output torque of the industrial-grade planetary reducer generally does not exceed 2000Nm, the special super-large torque planetary gearbox can do more than 10000Nm. The operating temperature is generally around -25 degrees C to 100 degrees C, and the operating temperature can be changed by changing the grease.
Several concepts about planetary gearboxes:
Series: The number of sets of planetary gears. Because a set of star gears can not meet the larger transmission ratio, sometimes need 2 or 3 sets to meet the requirements of the support of larger transmission ratio. By increasing the number of star gears, the length of the Stage 2 or 3 gearbox will increase and efficiency will decrease.
Return gap: fixed the output, the input is clockwise and counterclockwise direction rotation, so that the input to produce rated torque of -2% torque, the gearbox input has a small angle displacement, this angle displacement is the return gap. The unit is a “score”, which is one – sixty percent of the time. It’s also called a back gap.
Planetary gearbox is a wide range of industrial products, its performance can be comparable with other military-grade gearbox products, but has the price of industrial-grade products, is used in a wide range of industrial applications.
The reducer is small in size, light in weight, high in carrying capacity, long service life, smooth operation and low noise. It has the characteristics of power seccing and multi-tooth meshing. The maximum input power is up to 104kW. Suitable for lifting transport, engineering machinery, metallurgy, mining, petrochemicals, construction machinery, light industrial textiles, medical equipment, instrumentation, automobiles, ships, weapons and aerospace and other industrial sectors of the new series of new varieties of WGN fixed shaft transmission reducer, WN child gear transmission reducer, elastic average load less tooth difference decelerator.
Planetary gearbox is a versatile new gearbox with 20CvMnT carbide quenching and grinding teeth. 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 tower crane swing mechanism, but also can be used as supporting parts for lifting, excavation, transportation, construction and other industries.