The main components of wind turbine gearbox
Published on:
2025-08-15 14:55
The classification of doubly-fed wind turbine gearboxes is mainly based on the different internal transmission structures. The following are several common classification methods and structures:
1. Classification by transmission level
One-stage planetary + two-stage parallel shaft structure: This structure, consisting of a one-stage planetary transmission and two-stage parallel transmission, is widely used in wind turbines under 2 MW. It features a simple structure and requires few large parts, typically the torque arm, main housing, and planetary carrier. However, this structure has a relatively low transmission load capacity, and the lubrication conditions for the planetary gears and bearings are generally poor.
Two-stage planetary + one-stage parallel shaft structure: Mainly used in gearboxes with power above 2.5MW, it has strong load-bearing capacity, small size, light weight, small diameter but long horizontal length. Some gearboxes below 2MW also use this structure.
2. Classification by Spindle
With a spindle and gearbox: The spindle is installed inside the gearbox, resulting in a compact structure. The main bearings are oil-lubricated, extending life and reducing weight.
Without a spindle and gearbox: The spindle and gearbox are located separately, connected by a locking sleeve or coupling.
3. Classification by Gear Type
Planetary gear train + parallel shaft drive: This is the most commonly used doubly-fed gearbox structure, offering advantages such as compact size, light weight, and high transmission efficiency.
Multi-stage gearbox: Doubly fed wind turbines usually use multi-stage gearboxes to achieve a larger speed increase ratio, converting the low-speed rotation of the wind wheel into the high-speed rotation required by the generator.
4. Classification by Application Scenario
Onshore wind turbine gearboxes typically need to withstand harsh natural environments, such as wind, sand, rain, and snow, placing high demands on the gearbox's sealing performance and protection level.
Offshore wind turbine gearbox: Since the environment of offshore wind farms is more complex, there are higher requirements for the corrosion resistance and typhoon resistance of the gearbox.
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