The first-stage sun gear is the central power-transmission element in a wind turbine gearbox, responsible for converting low-speed, high-torque input from the main shaft into stable rotational motion within the Planetary Gear system. As the largest and most heavily loaded sun gear in the drivetrain, it requires superior mechanical strength, fatigue resistance, and long-term reliability. Our wind turbine gearbox sun gears are manufactured from premium Alloy Steel (e.g., 18CrNiMo7-6) through Precision Forging and machining, delivering exceptional bending fatigue strength and contact fatigue strength.
We specialize in producing large sun gears covering a size range up to ≤5 meters in diameter and 100 kg to 9 metric tons in weight. Whether you require a first-stage sun gear for low-speed, high-torque applications, or a second-stage sun gear for high-speed transmission, we can supply high-quality Forged Blanks after preliminary heat treatment. All products are manufactured to the most stringent quality standards. By integrating optimized heat treatment processes (such as normalizing + tempering, quenching and tempering) and comprehensive inspection (Ultrasonic Testing, Spectroscopic Analysis), we ensure every sun gear meets the demands of heavy-duty, long-life operation—both internally and externally.
Key Features & Performance Advantages -
High-Strength Forged Construction: Near-net shape forging and Ring Rolling deliver optimal grain flow and structural integrity.
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Advanced Heat Treatment: Quenching & tempering or normalizing + tempering improves core hardness, ductility, and load-bearing capacity.
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Carburizing-Ready Material: Ideal substrate for deep carburizing and case hardening, ensuring superior surface wear resistance and long fatigue life.
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Heavy-Duty Gear Design: Engineered specifically for the first-stage planetary system, handling extreme torque and impact loads.
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Industrial Reliability: Suitable for utility-scale wind turbines, gearboxes, and heavy industrial power transmission systems.
Manufacturing Process & Quality Assurance 1.Incoming Material Inspection
2.Blank Cutting
3.Ring Rolling
4.Post-Forging Visual & Dimensional Inspection
5.Heat Treatment: Quenching & Tempering / Normalizing + Tempering
6.Mechanical, Chemical & Metallurgical Testing
7.Machining of NDT Surfaces
8.UT & NDT Inspection
9.Rough Turning
10.Ultrasonic Testing, Spectroscopic Analysis, Hardness Measurement
11.Semi-Finish Turning
12.Dimensional Accuracy Inspection
13.Final Hardness Testing
14.Marking, Cleaning & Packaging
Specifications -
Material: Alloy Steel (18CrNiMo7-6 or customized)
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Condition: Forged, heat-treated, semi-machined
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Typical Dimensions: Approx. Φ1701 mm × 468 mm (custom sizes available)
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Core Value: Delivers maximum torque capacity, stable performance, and extended service life under high-load wind energy conditions
Applications Engineered from 18CrNiMo7-6 alloy steel and available in large diameters up to 5 meters, our forged and heat-treated sun gears are ideal for:
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Wind turbine gearboxes (first-stage and second-stage sun gears)
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Heavy-duty planetary gear systems for industrial reducers
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Energy and power generation equipment
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Mining and metallurgical machinery
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Marine and offshore mechanical drives
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Large-scale Industrial Machinery requiring high-strength forged gears
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