20P 20 mm Planetary Gearbox - Technical Datasheet v1.0¶
Status: Public engineering evaluation reference
Release date: 2026-10-06
The SigGear 20P is a 20 mm planetary gearbox platform with one- to four-stage configurations. Performance values below are consolidated from the current canonical product page. Mechanical-interface details are linked to the controlled 2D drawing reference released for this model.
Key Specifications¶
| Parameter | Public value |
|---|---|
| Nominal outer diameter | 20 mm |
| Number of stages | 1-4 |
| Gearbox length range | 20.1–34.5 mm |
| Reduction ratio range | 4:1–1296:1 |
| Rated allowable torque range | 6.0–13.0 kgf·cm |
| Maximum momentary torque range | 12.0–26.0 kgf·cm |
| Efficiency range | 66–90% |
| Backlash at no load | ≤ 1.5° |
| Continuous permissible input speed | ≤ 8,000 rpm |
| Operating temperature range | −40 to 120 °C |
Maximum momentary torque is not a continuous working rating.
Stage, Ratio and Performance¶
| Stages | Gearbox body length L | Available ratios | Rated allowable torque | Maximum momentary torque | Efficiency |
|---|---|---|---|---|---|
| 1 | 20.1 mm | 4 / 4.75 / 6 | 6.0 kgf·cm | 12.0 kgf·cm | 90% |
| 2 | 24.9 mm | 16 / 19 / 22.6 / 24 / 28.5 / 36 | 7.0 kgf·cm | 14.0 kgf·cm | 80% |
| 3 | 29.7 mm | 64 / 76 / 90.2 / 96 / 107.2 / 114 / 135.4 / 144 / 171 / 216 | 10.0 kgf·cm | 20.0 kgf·cm | 73% |
| 4 | 34.5 mm | 256 / 304 / 361 / 384 / 428.7 / 456 / 509.1 / 541.5 / 576 / 643 / 684 / 812.2 / 864 / 1026 / 1296 | 13.0 kgf·cm | 26.0 kgf·cm | 66% |
Published Load / Shaft Limits¶
| Parameter | Public value |
|---|---|
| Radial load, 10 mm from flange | ≤ 1.6 kgf |
| Shaft axial load | ≤ 0.5 kgf |
| Radial shaft play | ≤ 0.04 mm |
| Thrust shaft play | ≤ 0.2 mm |
Only values currently published for 20P are shown. Do not transfer limits from another frame size.
Motor Matching Reference¶
- Adapted DC motor nominal voltage: 3–36 VDC
- Adapted DC motor power: below 20 W
These are motor-matching conditions, not electrical ratings of the mechanical gearbox.
Mechanical Interface and CAD¶
View 20P Mechanical Interface v1.0
Download 20P Simplified STEP - 4-Stage Reference
A simplified public 4-stage STEP reference is released for early packaging and mechanical Design-In. The detailed full-assembly STEP remains configuration-controlled and request-only because it contains internal planetary transmission geometry.
For final CAD, provide the selected ratio, stage count and motor interface.
Request CAD / Controlled Drawing
Selection Information Required¶
Please provide:
- Required output speed or reduction ratio
- Continuous and momentary output torque
- Motor voltage, power and speed
- Motor shaft diameter and length
- Motor mounting-hole pattern and locating pilot
- Output-shaft requirements
- Radial and axial loads
- Duty cycle and ambient temperature
- Backlash, noise and service-life targets
- Prototype and annual quantity
Related Product¶
Engineering Contact¶
Wanrong Wang
International Sales / Sales Engineer, SigGear
wangwanrong@siggear.com