This internal gear is a high-precision transmission component engineered for the secondary stage of a planetary gearbox. Featuring a module of 8 (M8) and a large-diameter ring design, this precision gear for planetary gearbox is manufactured to exacting standards with internal teeth precisely cut to ensure smooth meshing with planetary gears. Its robust construction delivers exceptional torque density, superior load-sharing capability, and high transmission efficiency within a compact coaxial footprint. Precision-controlled tooth geometry and concentricity guarantee reliable performance, low noise, and even load distribution, making it an ideal choice for heavy-duty power transmission systems that demand durability and long service life.
Precision Internal Gear for Planetary Gearbox
Specification
Module
8
Application
Planetary gearbox
Material
42CrMo4
Heat Treatment
Tempering and quenching 285 - 310 HBW
Accuracy
DIN 6
Typical Applications of Internal Gears
Internal gear is widely deployed across demanding industries. In heavy industry and mining, it drives crushers, mills, excavators, and conveyor systems where high torque and ruggedness are essential. In renewable energy, it is integral to wind turbine yaw and pitch drives, enabling reliable blade control under variable loads. The automotive and EV sector utilizes it in electric axle reducers and heavy-duty vehicle transmissions, while aerospace and defense applications rely on it for precision actuators and UAV control systems. Additionally, it serves general industrial machinery, including winches, hoists, rotary tables, and robotics, providing the precision and load-bearing performance required for mission-critical operations.
Production process
5-Step Production Process
Tube Forging
Turning
Internal Gear Shapping
Heat Treatment
Ring Gear Grinding
Tube Forging
When gears need high performance that needs to withstand high loads, high stress, impact loads or fatigue loads, forgings are suggested to use. Forging allows metal fibers to be continuously distributed along the gear profile, significantly improving root strength and fatigue life.
Turning
This is the process of cutting and shaping solid materials into precise parts. It uses tools like lathes, mills, and drills to remove excess material. Machining transforms a simple block of metal into a finished, functional component.
Internal Gear Shapping
Gear shaping is a gear cutting process that used cutting tool that is essentially a “master gear” reciprocates while meshing in a synchronized rolling motion with the gear blank.The cutter is usually moving up and down.
Heat Treatment
Gears need to be running with two gears or above two gears, that makes them easy to be worn-out. That’s why most types of gears need to be harden through heat treatment.
Ring Gear Grinding
Gear Grinding is the the most common high-precision method for finishing hardened gears under gleason profile. There are two methods to use an abrasive grinding wheel removes material from the tooth flanks.
Inspection
Strict Quality Inspection
Dimension Inspection
Material Testing
Heat Treatment Testing
Accuracy Inspection
Dimension Inspection
Material Testing
Heat Treatment Testing
Accuracy Inspection
Packages
Professional Packaging Safe Arrival
Customized cost-effective packages for products protection. We select multi-model solutions, combining air, sea, or land freight for the optimal balance of cost, speed, and reliability.
Inner Package
Out Package
Carton
Wooden Package
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Your Precision
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