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Product Description
Engineered for Maximum Service Life and Reliability in the Most Demanding Environments
Yile Machinery is a leading manufacturer of large-scale, custom herringbone (double helical) girth gears. These gears are the operational heart of your heavy rotating equipment, and we build them to deliver unparalleled durability and performance.
From mining and mineral processing to cement production, our expertise in forging, casting, heat treatment, and precision machining ensures your critical machinery operates reliably, minimizing downtime and maximizing throughput.
For large-diameter rotating systems, the herringbone design is the superior engineering choice:
Massive Torque Transmission: The continuous, overlapping tooth engagement provides exceptional surface contact, allowing for the smooth transfer of immense torque loads from the drive pinion.
Smooth, Low-Vibration Operation: The double helical design cancels out axial thrust forces, allowing the gear to "float" on its support rollers. This ensures smooth rotation and reduces stress on the entire drive train and vessel structure.
Enhanced Longevity: Proper load distribution across the wide gear face minimizes localized wear, leading to a longer operational lifespan compared to other gear types.
Producing a girth gear of this magnitude is a complex undertaking that requires specialized facilities and deep process knowledge. Our integrated manufacturing process guarantees quality from raw material to finished product.
Material Formation (Forging or Casting):
Forging (Preferred): We utilize large-scale ring forging to create a superior, uniform grain structure, enhancing the gear's mechanical strength and fatigue resistance.
Casting: For certain designs and applications, we employ advanced steel casting techniques, ensuring internal soundness through controlled pouring and cooling.
Premium Alloy Steels: We manufacture using high-strength, through-hardening steels like 42CrMo4 (AISI 4140) and 35CrMo (AISI 4135) , selected for their excellent toughness and wear characteristics.
Specialized Heat Treatment: The gear undergoes a precise Quenching and Tempering (Q&T) cycle in our large-capacity furnaces. This critical step develops the optimal microstructure for high strength and resistance to surface wear and tooth root fatigue.
Precision Machining & Gear Cutting:
The gear blank is machined on large Vertical Turning Lathes (VTLs).
Teeth are cut using specialized heavy-duty CNC gear hobbing or milling machines, ensuring high accuracy across the entire circumference.
We have the capability to manufacture gears as a single piece or in segments (halves, quarters) to facilitate transportation and on-site assembly.
Rigorous Quality Assurance: Every girth gear is subjected to a comprehensive inspection protocol:
Non-Destructive Testing (NDT): Ultrasonic (UT) and Magnetic Particle (MT) inspection to verify the material is 100% free of internal or surface defects.
Dimensional Inspection: Full dimensional verification to ensure compliance with your drawings.
Hardness Testing: To confirm the success of the heat treatment process.
Our herringbone girth gears are the reliable choice for:
Mining & Mineral Processing: Main drive gears for SAG mills, AG mills, and ball mills.
Cement & Lime Production: Main drive gears for rotary kilns, dryers, and grinding mills.
Chemical & Sugar Industries: Drive gears for large rotary dryers and mixers.
Power Generation: Applications requiring high-torque rotational drives.
Partner with a Girth Gear Specialist
The reliability of your plant depends on the quality of its critical components. Submit your technical drawings, material specifications, and application details. Our engineering team will provide a comprehensive manufacturing plan and quote for a girth gear solution built for endurance.
