Our double helical gears—commonly referred to as herringbone gears—are purpose-built for heavy-duty power transmission applications where high torque capacity, axial load cancellation, and operational smoothness are paramount. Unlike single helical gears, which generate significant axial thrust that requires heavy-duty bearings and complex housing designs, the double helical configuration features two opposing helix angles machined onto a single gear blank. This “V” or “chevron” geometry effectively cancels internal axial forces, allowing the gear train to handle substantially higher loads with simpler bearing arrangements and reduced overall system complexity. The double helical gears for heavy-duty industrial gearboxes featured here are precision-engineered with a module of 6.5 and 51 teeth, delivering an optimal combination of tooth strength and contact ratio for demanding industrial environments. Manufactured from high-grade forged alloy steel, each double helical gear undergoes a comprehensive production cycle—including CNC hobbing, profile grinding (where specified), and rigorous final inspection—to ensure flawless tooth geometry, consistent lead accuracy, and exceptional surface finish.
Double Helical Gears For Heavy-Duty Industrial Gearboxes
Typical Applications of Double Helical Gears
The 6.5-module, 51-tooth double helical gear is a versatile power transmission component ideally sized for medium-to-heavy industrial machinery operating in harsh conditions. Its primary domain is heavy industrial gearboxes, particularly in steel rolling mills, where massive torque fluctuations and continuous operation demand gears with exceptional bending strength and resistance to shock loading. The axial force cancellation inherent in the double helical design makes this gear particularly valuable in marine propulsion systems, including main reduction gears for tugboats, ferries, and offshore support vessels, where confined engine room layouts benefit from eliminating thrust bearings. In the mining and aggregate sector, this gear configuration is commonly found in crusher drives, conveyor reducers, and mill gearboxes, where reliability under dust, moisture, and high ambient temperatures is non-negotiable. The cement industry relies on similar geometries for kiln drives and vertical roller mill transmissions, where the combination of high reduction ratios and continuous service demands gear pairs that can operate for decades with minimal maintenance. Additionally, double helical gears of this module range are specified in power generation applications, including wind turbine yaw and pitch drives, as well as pump and compressor trains in oil and gas pipelines.
6-Step Production Process
Forging
Turning
Herringbone Gear Milling
OD Grinding
Heat Treatment
Grinding or 5-Axis Machining
Strict Quality Inspection
Dimension Inspection
Material Inspection
Heat Treatment Testing
UT & MT Testing
Tooth Quality Inspection
Accuracy Testing
Dimension Inspection
Material Inspection
Heat Treatment Testing
UT & MT Testing
Tooth Quality Inspection
Accuracy Testing
Professional Packaging Safe Arrival
Inner Package
Out Package
Carton
Wooden Package
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