Precision Spur & Helical Gears
Precision Sun Gears serve as the high-speed input core of precision planetary gearboxes and servo drive reducers. Engineered with micro-geometric lead crowning, ultra-fine tooth grinding (Ra ≤ 0.2 μm), and DIN 4 accuracy for low noise, low backlash, and >98% efficiency.
Sango Automation Limited is a recognized leader in high-precision gear manufacturing in China. With state-of-the-art CNC grinding centers and advanced heat treatment lines, we supply world-class precision sun gears for robotics, wind power, and servo drive systems.
Features
Engineered for high-speed input rotation, balanced planetary load sharing, and minimal transmission error.
Micro-geometric Tooth Profile Crowning
Optimal 3D longitudinal and involute crowning prevents tooth edge stress concentrations and ensures uniform planetary load sharing under deflection.
Ultra-High Tooth Grinding Precision (DIN 4 / AGMA 12)
Ground on Reishauer and Klingelnberg CNC gear grinders to achieve pitch error ≤ 3 μm and concentricity runout ≤ 0.003 mm.
Deep Case Carburizing & Cryogenic Tempering
Manufactured from 18CrNiMo7-6 and 20CrMnTi alloy steel with HRC 58–62 surface hardness, HRC 35 core toughness, and deep fatigue resistance.
Integrated Involute Splines & Motor Couplings
Available as integrated shaft designs with DIN 5480 splines, precision collet clamps, or keyways for zero-slip torque transmission.
Technical Specifications
Standard and custom precision sun gear parameters engineered for multi-stage planetary reducers and industrial automation.
| Core Parameters | Industrial Standard Grade | Ultra-Precision Servo Grade |
|---|---|---|
| Module Range | 0.4 – 6.0 Module | 0.2 – 10.0 Module (Custom) |
| Tooth Accuracy Grade | ISO 6 / DIN 6 / AGMA 11 | ISO 4 / DIN 4 / AGMA 13 |
| Tooth Surface Roughness | Ra ≤ 0.6 μm | Ra ≤ 0.2 μm (Mirror Ground / Superfinished) |
| Core Hardness | HRC 30 – 38 | HRC 35 – 45 (High Impact Toughness) |
| Case Hardness | HRC 56 – 60 | HRC 58 – 62 (Carburized 18CrNiMo7-6) |
| Concentricity Runout | ≤ 0.008 mm | ≤ 0.003 mm (High-Speed Balanced) |
| Max Input Speed | Up to 6,000 RPM | Up to 15,000 RPM (Dynamic G1.0 Balanced) |
Differences from Standard Spur Pinions
Why specialized sun gears are essential for planetary gearboxes compared to general-purpose spur pinions.
| Design Aspect | Sango Precision Sun Gear | General Spur Pinion |
|---|---|---|
| Tooth Modification | 3D Involute & Lead Crowning for multi-planet mesh | Standard unmodified involute tooth flank |
| Load Distribution | Uniform 3/4/5 planet load sharing (Kγ ≤ 1.1) | Single mesh point; prone to edge stress |
| Runout & Balancing | Dynamic balancing for input speeds up to 15,000 RPM | Static balance; limited to lower speeds (<3,000 RPM) |
| Backlash Control | Ultra-low backlash (< 1 arcmin pairing) | Standard backlash (3–8 arcmin) |
| Lifespan & Fatigue | 50,000+ hours L10h rating under shock loads | Standard 15,000 hours service life |
Application Scenarios
Precision sun gears are the critical high-speed drive component in robotic joints, servo planetary reducers, electric vehicle drivetrains, and precision medical actuators.
