Forged External Ring Gear for Industrial Transmission Systems
The external ring gear is a key component in modern transmission and planetary gearbox systems, delivering strong mechanical performance, precise tooth engagement, and long service life. Manufactured through precision forging and multi-axis CNC machining, Weforging’s forged external ring gear ensures stable load capacity, accurate tooth geometry, and flexible customization for industrial reducers, construction machinery, and other demanding applications.
What Is an External Ring Gear?
An external gear ring is a circular gear with teeth positioned on the outer circumference. It works together with pinions or planetary gears to transmit torque efficiently. Compared with internal ring gears, which have teeth on the inner diameter, external ring gears provide:
Higher compatibility with external gear sets
Larger torque transfer capability
Simplified assembly in many gearbox layouts
Both types serve different engineering needs, and external gear rings are widely chosen for systems requiring strong load capacity and straightforward installation.
Forging & CNC Machining Process
To ensure durability and precision, each ring gear undergoes a controlled manufacturing workflow:
Closed-die forging or ring rolling for superior material density and mechanical strength
CNC rough and finish machining for highly accurate tooth profiles
Gear hobbing, shaping, or grinding depending on customer requirements
Heat treatment (carburizing, quenching, tempering) to enhance hardness and wear resistance
Final inspection with CMM & gear measurement instruments
This tightly controlled production process ensures stable accuracy and long-term reliability for every batch.
Available Materials
Weforging offers a full range of materials based on application needs:
Alloy steel: 42CrMo, 40Cr, 20CrMnTi, 20CrNiMo
Carbon steel: C45 / 1045, Q235, Q345
Stainless steel: 304, 316L (optional)
Custom materials upon request
All materials can be heat-treated to reach required hardness and mechanical properties.
Specifications & Customization
Our external ring gears are fully customizable:
Outer diameter: 80 mm – 1500 mm
Module: M1 – M20
Tooth profile: straight / helical
Tolerance: IT6–IT9 depending on machining level
Surface roughness: Ra0.8–3.2 µm
Heat-treatment hardness: HRC 35–62 per application
OEM drawings, samples, or technical requirements are welcome.
Key Advantages of Forged External Gear Rings
Weforging’s forged external gear rings offer strong load capacity, stable meshing, and excellent wear resistance through optimized forging and heat-treatment processes. Their precise tooth profiles ensure smooth operation even at high speeds, while rigorous quality control supports long, reliable service life across demanding industrial applications.
Applications
External ring gears manufactured by Weforging are widely used in:
Planetary gearboxes and industrial reducers
Construction machinery: excavators, rotary drives, winches
Agricultural machinery: tractors, harvesters, balers
Automotive and off-highway equipment
Mining and metallurgical machinery
Automation and robotics transmission systems
Across these sectors, our gears help ensure smooth torque transmission and stable system performance.
Conclusion
Weforging’s forged external gear rings combine high-strength materials, precision machining, and reliable heat-treatment processes to deliver stable performance across a wide range of industrial transmission systems. With consistent accuracy and dependable durability, each gear ring is engineered to meet the needs of demanding applications in heavy machinery and advanced mechanical equipment.
If you need a reliable standard or custom-designed ring gear, contact us to request a quote or share your technical requirements.
