Precision-engineered internal gears are fundamental to high-performance planetary speed reducers, and our range includes both internal spur and helical gears to meet diverse application requirements. Internal spur gears feature straight teeth cut on the inner circumference, delivering reliable power transmission with zero axial thrust – an ideal choice for simpler, cost-sensitive reducer designs. Internal helical gears, with their angled tooth geometry, provide enhanced load capacity, smoother engagement, and significantly quieter operation, making them the preferred option for high-speed and heavy-duty planetary gearboxes. Both variants are manufactured from high-grade alloy steel, case-hardened and precision-ground to achieve optimal tooth hardness, wear resistance, and dimensional accuracy. Advanced CNC machining ensures consistent profile geometry, minimal backlash, and excellent concentricity – all essential for maximizing torque density and service life in compact planetary drive systems. Available in a wide range of modules and customizable specifications, our internal spur and helical gears offer reliable, high-efficiency transmission solutions for modern speed reducer applications.
Internal Spur and Helical Gear for Planetary Speed Reducer
Specification
Module
8
Application
Planetary gearbox
Material
42CrMo4
Heat Treatment
Case harden+ Nitriding 50±2HRC
Accuracy
DIN 6
Typical Applications of Internal Gears
Internal spur and helical gears are widely employed across industries that demand compact, high-torque planetary speed reducers.
- In the construction and mining sectors, these gears are integral to planetary gearboxes for excavators, bulldozers, crushers, and conveyor systems, where they withstand extreme shock loads and continuous operation.
- The automotive and electric vehicle industry relies on them for electric axle drives, hybrid transmissions, and e-mobility drivetrains, where space efficiency and power density are paramount.
- In renewable energy systems, they are essential components in wind turbine pitch and yaw drives, ensuring reliable blade control under variable wind conditions.
- Other key application areas include marine propulsion and offshore equipment, industrial automation and robotics, material handling and hoisting equipment, and agricultural machinery.
Whether you require the axial-load-free simplicity of spur gears or the high-capacity, low-noise performance of helical gears, both options can be customized by Belon in material grade, heat treatment, and tooth profile to precisely match your planetary speed reducer design and operational demands.
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
Transmission Partner
Do you have drawings to be implemented, or problems to be solved? Please feel free to contact us. From initial inquiry and technical specification confirmation to production and delivery, our dedicated team will provide you with one-on-one service, ensuring that every step meets your stringent requirements for precision.
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