The core structure and transmission principle of planetary reducers

Planetary reducers, as a high-end subcategory of gear reducers, are named for their structure resembling "planetary motion". Their core structure consists of four major components: the sun gear, planetary gears, internal gear ring, and planetary carrier. The transmission principle can be summarized as "coordinated meshing and torque amplification":

Power input: The motor drives the sun gear (central gear) to rotate. The sun gear meshes with 3 to 6 planetary gears evenly distributed on the planetary carrier, driving the planetary gears to revolve around the sun gear. 
Torque transmission: The planet gears simultaneously mesh with the fixed internal gear ring (external gear ring), generating a deceleration effect through the meshing of the tooth surfaces and transmitting the torque to the planet carrier.
Power output: The planetary carrier is rigidly connected to the output shaft, and the power is ultimately output in the form of low speed and high torque. 
This "multi-tooth meshing" structure gives it unique advantages: compared with cylindrical gear reducers of the same specification, the load capacity of planetary reducers is increased by 40% to 60%, the volume is reduced by 30% to 50%, and the transmission efficiency can reach 97% to 99% (single stage). Moreover, during operation, the planetary gears are evenly stressed, and the vibration value can be controlled below 2.5mm/s, with a significant quieting effect (operating noise ≤ 65dB).