Double Helical Gear

Understanding Double Helical (Herringbone) Gears

Double helical gears, commonly referred to as herringbone gears due to the V-shape pattern of their teeth, are a sophisticated type of gear designed to overcome the axial thrust inherent in single helical gears. They achieve this by combining a right-hand and a left-hand helix on the same gear face.

Key Advantages:

• Balanced Axial Thrust: The primary advantage. The thrust generated by one helix is counteracted by the opposite thrust from the other helix, resulting in zero net axial force on the shaft. This simplifies bearing arrangements and allows for higher loads.
• Very High Load Capacity: Combining the smooth engagement of helical teeth with the ability to utilize the full face width (unlike gears needing a central groove), they can transmit enormous torque.
• Smooth and Quiet Operation: Like single helical gears, the gradual engagement leads to low vibration and noise levels, even at high speeds.
• Self-Centering Action: The V-shaped teeth tend to naturally center the gear axially, although precise alignment is still critical.

Considerations:

• Manufacturing Complexity: Producing accurate double helical gears requires specialized machinery and techniques, making them more expensive than single helical or spur gears.
• Alignment Sensitivity: Precise axial and angular alignment is crucial for proper load sharing between the two helices.
• Applications: Used in heavy machinery where high torque, smooth operation, and thrust elimination are vital, such as large gearboxes, rolling mills, marine drives, power turbines, and heavy industrial equipment.

Shreeji Gears: Your Specialist Double Helical Gear Manufacturer

Shreeji Gears possesses the specialized knowledge, machinery, and quality control processes necessary to manufacture high-precision double helical / herringbone gears that meet the rigorous demands of heavy industry.

Why Choose Shreeji Gears for Double Helical Gears?

• Specialized Manufacturing: Utilizing advanced gear cutting techniques (hobbing, shaping, milling) capable of generating accurate opposite-hand helices with precise apex alignment.
• Material Expertise: Selecting high-strength, durable materials like forged alloy steels (EN24, EN36, 42CrMo4, etc.) or cast steel appropriate for extreme loads and fatigue resistance.
• Precision Grinding: Offering profile grinding for superior accuracy, surface finish, and noise reduction, crucial for high-performance applications.
• Robust Heat Treatment: Implementing carefully controlled heat treatment processes (carburizing, nitriding, hardening & tempering) to achieve the required surface hardness and core toughness.
• Rigorous Quality Assurance: Employing meticulous inspection methods, including checks for tooth profile accuracy, lead, pitch, runout, and critical apex alignment, ensuring balanced load distribution.
• Heavy-Duty Applications Focus: Experience in manufacturing gears for demanding sectors like steel mills, power generation, marine, mining, and heavy industrial machinery.
• Custom Engineering: Capable of manufacturing double helical gears to specific customer drawings, standards (AGMA, DIN, ISO), and unique operational requirements.

General Technical Specifications (Customizable):

• Material: Forged Alloy Steels (EN24, EN36, 42CrMo4, etc.), Cast Steel, High-Grade Cast Iron
• Module Range: Typically 2 Module to 25 Module (or equivalent DP) - contact for specifics
• Diameter Range: Up to 2000 mm or more (contact for larger sizes)
• Helix Angle: Standard and custom angles (e.g., 23°, 30°, 45°) - RH/LH combination
• Face Width: As per design requirements
• Axial Thrust: Self-Cancelling / Balanced
• Quality Standards: Manufactured to AGMA, DIN, ISO standards, up to precision ground quality (e.g., AGMA Q12 / DIN 5)
• Heat Treatment: Case Carburizing & Hardening, Nitriding, Induction Hardening (where applicable), Through Hardening & Tempering

Need gears for extreme torque transmission without axial thrust issues? Rely on Shreeji Gears, your expert double helical gear manufacturer in India. Contact us today to discuss your heavy-duty gear requirements!