Planetary Gearbox Manufacturer — High Torque, Compact, Efficient
Raydafon is a China-based reducer factory with direct supply. We provide planetary reducers with stable performance, compact structure, and reasonable price for automation, high-load transmission, and precision control.
Structure & Material
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High-strength alloy steel structure
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Gear carburized, quenched, and precision ground
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Tooth surface hardness HRC60±2
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Strong fatigue resistance, higher load capacity than traditional gear mechanisms
Performance
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Three-tooth symmetrical meshing design
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Transmission efficiency above 95%
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Stable operation, low noise, uniform torque output
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Suitable for servo systems, electric cylinders, industrial robots, wheeled mobile chassis
Configuration Options
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Single-stage, two-stage, three-stage combinations
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Speed ratios from 3:1 to 200:1
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Output: key shaft, spline shaft, flange type, custom non-standard interface
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Dynamic balancing and concentricity tested before shipment
Widely used in automated assembly lines, packaging machinery, CNC equipment, conveying equipment, engineering crawler chassis, and wind power control systems. Whether you are an integrator, a complete machine manufacturer, or a maintenance service provider, we can provide cost-effective transmission solutions. Contact us for a quote.
How A Planetary Gearbox Works
A planetary reducer has three key parts: the central sun gear (input pinion), the planetary gear set rotating around it, and the inner gear ring wrapped outside.
Step 1 — Power input The motor drives the sun gear to rotate.
Step 2 — Multi-tooth meshing The sun gear drives multiple planetary gears to rotate. These gears rotate while revolving along the sun gear.
Step 3 — Power output Power is transmitted to the output shaft through the planetary carrier fixed on the gears.
This multi-tooth meshing method shares force among multiple gears, giving smooth output, low noise, and stronger load-bearing capacity than ordinary gear structures. Raydafon planetary reducers output higher torque under the same volume, with compact structure for equipment with limited installation space.
Because the internal planetary gear constantly changes force position during rotation, gear wear is even and the whole machine has a longer life. We use hardened alloy steel gears, precision bearings, and low backlash assembly standards for stable output and high positioning accuracy. Suitable for repeated start-stop, forward-reverse, and low inertia load conditions.
How To Calculate Gear Ratio Of Planetary Gearbox
Transmission ratio determines the output shaft speed and torque. It has a direct impact on equipment operating efficiency and load matching.
Common Structure: Sun Gear Active, Inner Ring Fixed, Planet Carrier Output
i = 1 + (Zr ÷ Zs)
Zr = inner ring teeth | Zs = sun gear teeth
Example
Sun gear teeth: 20
Inner ring teeth: 60
i = 1 + (60 ÷ 20) = 1 + 3 = 4
Motor rotates 4 times, output shaft rotates 1 time → 4:1
Raydafon Standard Range
Single-stage: 3–10
Two-stage: 15–100
Three-stage: for heavy-load low-speed conditions
Common range: 3:1 to 100:1
Different stages superimpose internal friction, which slightly affects efficiency. Under the premise that the speed ratio allows, choose a more efficient low-level combination.
Raydafon can recommend a reasonable transmission ratio and structural level based on your motor speed, output speed requirements, and load torque. We also provide parameter drawings and selection suggestions. Contact us for assistance with ratio calculation and model matching.
