Double Helical Gear
The Ultimate Solution for High-Torque, Zero-Thrust Power Transmission
Engineered to conquer the most demanding industrial environments, our custom herringbone gears deliver unrivaled reliability and performance.
- Flawless Axial Thrust Cancellation
- Unrivaled Torque & Load Capacity
- Ultra-Smooth, Low-Vibration Operation
- Forged Steel for Maximum Durability
Manufacturing Specifications
We manufacture custom double helical gears to your exact drawings and quality standards. Our advanced production ensures perfect apex alignment for balanced performance. For single-angle thrust applications, our helical gears offer an excellent alternative.
| Gear Type | Double Helical, Herringbone (with or without relief groove) |
| Module | 2 to 25 Module |
| Diametral Pitch (DP) | 12 DP to 1 DP |
| Maximum Diameter | Up to 2000mm (78 inches) |
| Face Width | Up to 800mm |
| Helix Angle | Customized (e.g., 15°, 23°, 30°, 45°) |
| Materials | Forged Alloy Steel (EN24, EN36, 42CrMo4), Cast Steel |
| Heat Treatment | Carburizing, Nitriding, Induction Hardening, Hardening & Tempering |
| Gear Quality | Precision hobbed or ground up to DIN 5 / AGMA 13 |
Mission-Critical Industrial Applications
The unique properties of double helical gears make them the only choice for equipment where failure is not an option:
- Rolling Mills: Withstanding immense, reversing torque that would destroy lesser gears.
- Marine Propulsion: Ensuring smooth, reliable power transfer from engine to propeller without stressing the drivetrain.
- Power Generation Turbines: Handling extreme speeds and loads in critical power-up and power-down cycles.
- Large Industrial Gearboxes: Providing the backbone for heavy-duty machinery with unparalleled service life.
- Cement and Mining Equipment (Mills, Kilns)
- Plastic Extruders and High-Torque Mixers
- Heavy-Duty Pumps and Compressors
We provide complete custom manufacturing solutions for these and other demanding sectors.
Gear Type Comparison: Why Choose Double Helical?
Choosing the right gear type is critical for performance and longevity. Here’s how double helical gears stack up against other common parallel-axis gears.
| Feature | Double Helical | Single Helical | Spur Gear |
|---|---|---|---|
| Axial Thrust | None (Self-Cancelling) | High (Requires Thrust Bearings) | None |
| Load Capacity | Highest | High | Good |
| Noise/Vibration | Lowest | Low | High |
| Speed Capability | Very High | High | Moderate |
| Manufacturing Cost | High | Moderate | Low |
| Ideal Use Case | Max torque, zero thrust | High speed, high load | Cost-effective, simple drives |
Frequently Asked Questions
Its ability to completely cancel out axial thrust. The opposing helix angles create equal and opposite forces that balance each other, eliminating the primary cause of bearing wear in high-load helical systems and simplifying gearbox design.
A true herringbone gear has continuous V-shaped teeth without a central gap, requiring specialized manufacturing. A grooved double helical gear has a relief channel in the middle to allow for tool clearance during hobbing. Both perform the same function, and we can manufacture both based on your application's needs. Contact our engineers to discuss the best option for you.
Choose a double helical gear when your application involves very high torque or speed, and managing the resulting axial thrust from a single helical gear would be impractical, costly, or a point of failure. They are the superior choice for mission-critical reliability.
The Shreeji Gears Advantage: Engineering Beyond the Blueprint
We don't just cut gears; we engineer solutions that enhance your machinery's performance and lifespan.
Flawless Force Cancellation
The promise of a herringbone gear is zero thrust. We deliver on that promise with a symphony of precision. Our advanced CNC machining and metrology ensure perfect apex alignment, guaranteeing balanced forces and eliminating the primary cause of bearing failure in your system.
Material Integrity as the Foundation
Our gears are born from high-integrity forged alloy steel (like 42CrMo4), ensuring a superior grain structure that withstands punishing shock loads. Paired with our expertly controlled heat treatments, the result is a gear with unmatched core toughness and surface durability.
Your Mission-Critical Partner
We are more than a supplier; we are your partner in performance. We de-risk your supply chain by manufacturing to your exact drawings and quality standards, guaranteeing seamless integration and reliable operation, backed by the expertise of our dedicated team.
Engineering the V-Shape: The Science Behind Herringbone Gears
When to Specify a Double Helical Gear
This premium gear is the definitive solution for specific engineering challenges. Specify a double helical gear when:
- Axial thrust is unacceptable: The primary reason. If your design cannot accommodate heavy-duty thrust bearings or if thrust is a known failure point.
- Maximum torque transmission is required: The full face width engages to transmit higher loads than a comparable spur gear.
- Smoothness and low noise are critical: The gradual, overlapping tooth engagement is even smoother than a single helical gear, making it ideal for high-speed, low-vibration systems.
- Gearbox reliability must be maximized: By eliminating thrust forces, you increase the life of the entire drivetrain, not just the gears. For angled drives with similar needs, a spiral bevel gear is the equivalent solution.
Our Mission-Critical Quality Process
Every gear we produce undergoes a rigorous inspection protocol to guarantee performance.
- Material Certification: We start with certified, fully traceable forged steel blanks.
- In-Process Dimensional Checks: Key dimensions are verified after each manufacturing stage.
- Advanced Gear Metrology: We use specialized equipment to inspect tooth profile, lead, pitch, and critical apex alignment.
- Non-Destructive Testing (NDT): On request, we perform Magnetic Particle Inspection (MPI) or Ultrasonic Testing (UT) to ensure sub-surface integrity.
- Final Inspection & Reporting: A complete dimensional report accompanies your order, ensuring it meets every specification on your drawing.
Start Your Custom Gear Project Today
Receive a comprehensive, no-obligation quote from our engineering team.
For the fastest and most accurate quote, please email your engineering drawing to support@shreejigears.com. If a drawing is not available, include these key details:
- Module or Diametral Pitch (DP)
- Number of Teeth & Helix Angle
- Overall Face Width
- Material & Hardness (e.g., EN36, 60 HRC)
- Bore Size & Keyway Details
- Application / Industry
- Required Quantity