Custom Planetary Gear Manufacturer
Planetary Gear
China Simis Company specializes as an OEM custom manufacturer of high-precision Planetary Gear components, including Sun Gears, Planet Gears, and Ring Gears. Planetary gear sets are crucial for achieving high torque output and large reduction ratios within minimal space, making them essential in applications demanding exceptional power density, such as robotics, automotive transmissions, and wind turbine gearboxes.
Due to the continuous heavy loading, the core components (Planet and Sun Gears) are typically produced via Precision Closed Die Forging to maximize fatigue strength. This is followed by critical secondary operations, including specialized Heat Treatment (Carburizing) and Precision Gear Grinding, to achieve the AGMA Class 10+ accuracy required for minimum backlash and maximum operational life.
What Are the Planetary Gear Manufacturing Processes?
The high-performance requirements of planetary systems demand a combination of maximum material strength (forging) and ultra-precise finishing (grinding). We adopt 5 core processes including Precision Closed Die Forging, Casting, Gear Cutting, Heat Treatment and Precision Gear Grinding to meet different high-precision planetary gear component production needs.
| Manufacturing Process | Component Focus | Material Focus | Key Advantage for Planetary Gear Performance |
Precision Closed Die Forging | Sun Gears, Planet Gears. | Alloy Steel (8620, 4340), Carbon Steel. | Mandatory for Fatigue Strength. Forging optimizes grain flow, essential for small gears under constant, immense cyclical load and high contact stress. |
| Casting (Sand/Investment/Lost Foam) (Blank Forming) | Large Ring Gears, Carriers. | Ductile Iron (A536), Cast Steel, Stainless Steel. | Used for larger external ring gears or complex carriers where geometry is complex and the power density requirement is slightly lower than the internal gears. Lost Foam Casting is leveraged for Ductile Iron parts. |
| Gear Cutting (Hobbing/Shaping) | All Components. | All Gear Materials. | Primary method for roughing the gear teeth. Precision setup is essential for maintaining the correct tooth profile and helix angle before grinding. |
| Heat Treatment (Hardening) | Sun & Planet Gears. | Alloy Steel (Carburizing), Carbon Steel (Induction Hardening). | Critical. Achieves extreme surface hardness (HRC 58-62) to prevent pitting and wear, maintaining a tough core for impact resistance. |
| Precision Gear Grinding (Finishing) | High-Speed/Low-Backlash Gears. | Hardened Alloy Steel. | Essential for AGMA 10+ accuracy. Corrects minor heat treatment distortion and achieves the micro-level precision required for low noise and minimal backlash in sensitive applications (robotics, auto transmissions). |
How to Select Planetary Gear Materials?
Material selection is focused on high-hardenability steels suitable for the extreme contact stresses and cyclic bending stresses inherent in planetary systems. We provide 4 main material types including Alloy Steel, Carbon Steel, Ductile Iron and Stainless Steel for high-precision planetary gear component production, each with specific performance advantages matching different application requirements.
| Material Type | Primary Performance Requirement | Typical Planetary Gear Component & Service |
| Alloy Steel (AISI 8620, 4340, 9310) | Highest Strength, Deep Hardenability, Core Toughness. | Sun and Planet Gears in Wind Turbines, Auto Transmissions, and Heavy Machinery. |
| Carbon Steel (AISI 1045, 1050) | Moderate Strength, Cost-Effective for Induction Hardening. | Components in conveyors, hoists, and lower-speed industrial compressors. |
| Ductile Iron (ASTM A536) | Vibration Damping, Cost-Effective. | Large Ring Gears or complex carriers in industrial planetary drives. |
| Stainless Steel (304, 17-4PH) | Corrosion Resistance and High Strength. | Drive systems in harsh environments (marine, chemical processing, washdown areas). |
What Measures Ensure Planetary Gear Quality Assurance and Low Backlash Certification?
The compact nature of planetary systems means even minor errors in tooth geometry or alignment can lead to catastrophic failure, requiring stringent QA. Our core quality assurance measures include Profile and Lead Testing, Accuracy Grading, Metallurgical Verification and Assembly Tolerance Control to guarantee each high-precision planetary gear meets strict industry standards.
·Profile and Lead Testing:
Specialized CNC gear inspection machines are used to verify the precise Tooth Profile, Lead (Helix Angle), and Runout to ensure proper load sharing across all planets.
·Accuracy Grading:
Gears are certified to high-precision industry standards, typically AGMA Quality Class 10 to 12 or equivalent ISO Grades, mandatory for low-backlash systems (robotics/auto).
·Metallurgical Verification:
Post-heat treatment, testing includes Case Depth Measurement and Microhardness Testing to confirm the depth and hardness of the wear-resistant surface layer on the gear teeth.
·Assembly Tolerance:
Verification of bore concentricity and mounting face flatness is essential to guarantee accurate alignment and prevent uneven load distribution among the planet gears.
What Are the Key Applications for Simis Custom High-precision Planetary Gears?
Our high-precision planetary components are crucial for modern, efficient, and compact power trains, covering wind turbines, automotive transmissions, robotics & automation and heavy industry sectors.
·Wind Turbines:
Used in the main gearbox to achieve high-ratio speed reduction between the rotor and the generator.
·Automotive Transmissions:
Essential for automatic transmissions, providing compact, seamless speed and torque changes.
·Robotics & Automation:
Servo drives, harmonic drives, and articulation joints requiring low backlash and extremely high torque density.
·Heavy Industry:
Drive systems for hoists, large conveyors, and heavy-duty compressors where space efficiency is necessary.
What Are the Advantages of Simis OEM Custom Manufacturing Planetary Gears?
Partnering with Simis ensures certified high power density, maximum fatigue life, and the required precision for planetary systems:
·Forging for Maximum Power Density:
We utilize Precision Forging for planet and sun gears, maximizing material strength and grain flow to ensure the components can handle the immense torque and cyclic fatigue required in a compact system.
·Ultra-Precision Grinding:
Our advanced Gear Grinding capability achieves the tightest tolerances required to eliminate backlash, minimize noise, and achieve high AGMA grades, essential for modern automation and automotive uses.
·Certified Case Hardening:
We utilize controlled atmosphere Carburizing and other thermal treatments to guarantee the precise Case Depth and hardness, preventing premature pitting and extending the operational lifespan of the highly stressed gear teeth.
·Integrated Manufacturing:
We control the process from initial forging/casting blank to final ground gear, ensuring that the necessary geometric precision is maintained across all features (tooth profile, bore, face).
How to Get a Quote for Custom Planetary Gear Components?
China Simis Company is your expert global partner for custom forging and casting planetary gears, engineered for superior power density, critical fatigue life, and ultra-low backlash precision.
Please submit your 2D technical drawings, CAD models, and specific requirements for Module/Diametral Pitch, Number of Teeth (Sun, Planet, Ring), AGMA Quality Class (e.g., 10+), material grade, and required Case Depth/Hardness to our engineering department for a consultation and detailed quotation.
