Gear boxes and speed changers for wind turbines, as described in statistical note 6 to this chapter
Transmission shafts (including camshafts and crankshafts) and cranks; bearing housings, housed bearings and plain shaft bearings; gears and gearing; ball or roller screws; gear boxes and other speed changers, including torque converters; flywheels and pulleys, including pulley blocks; clutches and shaft couplings (including universal joints); parts thereof: > Gears and gearing, other than toothed wheels, chain sprockets and other transmission elements entered separately; ball or roller screws; gear boxes and other speed changers, including torque converters: > Gear boxes and other speed changers: > Fixed ratio speed changers, multiple and variable ratio speed changers each ratio of which is selected by manual manipulation: > Other > Gear boxes and speed changers for wind turbines, as described in statistical note 6 to this chapter
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
Products classified under HTS 8483.40.50.20
Wind Turbine Yaw Drive Gearbox
Precision gearbox for wind turbine yaw system that rotates entire nacelle to face wind direction, featuring high-ratio worm or planetary gears. Although rotational speed is low, classified under HTS 8483.40.50.20 as wind turbine specific speed changer.
Wind Turbine Main Gearbox
The primary gearbox in a horizontal axis wind turbine that steps up the low rotational speed of the rotor shaft to the high speed required by the generator, typically achieving ratios of 50:1 to 100:1. It falls under HTS 8483.40.50.20 as a fixed ratio speed changer specifically designed for wind turbines per statistical note 6 to chapter 84. These gearboxes handle extreme torque loads from variable wind conditions.
Planetary Gearbox for Wind Turbine Rotor
Multi-stage planetary gearbox mounted directly on the wind turbine rotor hub to increase rotational speed for the main shaft. Classified under HTS 8483.40.50.20 as wind turbine speed changer with fixed ratios optimized for low-speed high-torque input from blades.
Wind Turbine Generator Speed Multiplier Gearbox
High-speed multiplier gearbox coupling turbine rotor to electrical generator, featuring helical and planetary stages for smooth power transmission. Meets HTS 8483.40.50.20 criteria as purpose-built wind turbine speed changer with multiple fixed ratios.
Compact Gearbox for Small Wind Turbine
Integrated gearbox for turbines under 100kW capacity, combining multiple speed stages in compact housing for residential/small commercial wind systems. Falls under HTS 8483.40.50.20 as wind-specific speed changer despite smaller scale.
Two-Stage Helical Gearbox for Wind Turbine
Parallel axis helical gearbox with two fixed ratio stages for medium-speed wind turbine applications, designed for high efficiency (98%+) and low noise operation. Specifically provided for in HTS 8483.40.50.20 for wind turbine use.
High-Torque Offshore Wind Gearbox
Corrosion-resistant gearbox for offshore wind turbines rated 6-15MW, featuring enhanced sealing and oversized bearings for harsh marine environment. HTS 8483.40.50.20 applies to all wind turbine gearboxes regardless of location or capacity.
Integrated Drive Train Gearbox for Wind Turbine
Direct-drive compatible gearbox integrating with permanent magnet generator in medium-speed drive train concept (300-500 RPM). Still qualifies as fixed ratio speed changer under HTS 8483.40.50.20 for wind turbine application.
Retrofit Gearbox for Wind Turbine Upgrade
Replacement gearbox designed for upgrading older turbines to higher capacity, maintaining original interface dimensions while improving efficiency ratios. Classified HTS 8483.40.50.20 as wind turbine specific even for aftermarket applications.
Variable Ratio Wind Turbine Gearbox
Advanced gearbox with multiple fixed ratios manually selected during maintenance for optimal performance across wind speeds. Still qualifies under HTS 8483.40.50.20 as wind turbine speed changer despite ratio selection capability.