The core transmission mechanism of a planetary reducer consists of three main components: the sun gear, the planet gears, and the ring gear. Due to its compact and efficient design, a single-stage planetary gearbox typically has a minimum reduction ratio of 3 and a maximum of up to 10. Commonly used ratios include 3, 4, 5, 6, 8, and 10. Most planetary gearboxes have no more than three stages, but custom designs can go up to four stages for applications requiring extremely high reduction ratios. Compared to other types of reducers, planetary gearboxes offer several advantages, such as high rigidity, precision (with single-stage backlash less than 1 arc minute), high efficiency (up to 97–98% in single-stage configurations), excellent torque-to-volume ratio, and long service life with minimal maintenance.
Features:
Planetary reducers are frequently used in conjunction with stepper and servo motors to reduce speed, increase torque, and match the inertia of the system. The rated input speed can be as high as 18,000 rpm, although this varies depending on the size of the unit — larger reducers tend to have lower maximum input speeds. Industrial-grade planetary gearboxes typically have output torques up to 2,000 Nm, while specialized high-torque models can exceed 10,000 Nm. These units operate within a temperature range of approximately -25°C to 100°C, and their performance can be adjusted by changing the lubricating grease. Their robust design makes them ideal for demanding industrial applications where reliability and precision are essential.
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