Forged Internal Ring Gear for Planetary Gearbox
The internal ring gear is a fundamental component in modern power transmission systems, particularly in planetary gearboxes where smooth torque transfer, accurate meshing, and extended service performance are expected. As a stationary or driven element, it contributes to balanced load sharing and stable transmission behavior.
Produced through ring rolling forging and precision CNC machining, Weforging’s forged internal ring gears integrate optimized material selection, controlled heat treatment, and precise tooth geometry to support consistent performance in industrial equipment, electric drive systems, and construction machinery applications.
What Is an Internal Ring Gear?
An internal ring gear is a circular gear with teeth cut on the inner diameter, typically used in planetary gear systems. Unlike external gears, internal ring gears mesh internally with planet gears, allowing compact designs, balanced load sharing, and high torque capacity.
Internal vs. External Ring Gears:
Internal ring gears feature inward-facing teeth and are widely used in planetary gearboxes.
External ring gears have outward-facing teeth and are usually paired with pinions or shafts.
Because of their structural role, internal ring gears require excellent dimensional stability, precise tooth profiles, and high material integrity—making forging an ideal manufacturing solution.
Manufacturing Process of Forged Internal Ring Gears
Weforging produces internal ring gears through a fully controlled manufacturing process:
Ring rolling forging to create near-net-shape gear blanks with continuous grain flow
CNC machining for accurate inner and outer diameters
Gear shaping or broaching to form precise internal involute tooth profiles
Heat treatment (carburizing, quenching, tempering) to improve hardness and wear resistance
Final inspection including dimensional checks and gear accuracy verification
This process ensures high structural strength, stable tooth geometry, and consistent quality across production batches.
Materials & Specifications
Weforging offers multiple material options to meet different application requirements:
Common Materials
42CrMo
20CrMnTi
18CrNiMo7-6
Carbon steel and alloy steel (custom grades available)
Custom Specifications
Outer diameter and inner diameter
Module and number of teeth
Heat treatment depth and hardness
Tolerance levels based on application standards
All internal ring gears are produced according to customer drawings or technical specifications.
Product Performance & Advantages
Thanks to the forged structure and precision machining, Weforging’s internal ring gears provide strong load capacity and stable meshing performance. Optimized grain flow enhances mechanical strength, while accurate involute tooth profiles ensure smooth torque transmission. Combined with controlled heat treatment, these features support long service life and reliable operation in continuous or high-load conditions.
Applications
Weforging’s forged internal ring gears are widely used in:
Planetary gearboxes for industrial reducers
Electric drive systems, including servo and motor-integrated gear units
Construction machinery, such as excavators, cranes, and lifting equipment
Industrial automation requiring compact, high-torque transmission solutions
Why Choose Weforging
Integrated in-house forging, CNC machining, and heat treatment capabilities
Proven experience supporting OEM programs with forged internal ring gears
Flexible customization options based on drawings, specifications, or samples
Consistent quality management aligned with international export standards
Contact Us
If you are sourcing a high-performance internal ring gear for a planetary gearbox or require a fully customized forged solution, Weforging’s engineering team is ready to support your project.
Contact us to discuss specifications, request a quotation, or receive technical guidance.
