Wind Turbine Main Shaft Coupling Layout for Gearbox Reliability
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Solution Overview
Problem
Wind turbine power transmission systems face challenges in reliability due to unpredictable and varied loads, which can result in parasitic forces damaging gearbox components and main bearings, and existing solutions, such as flexible couplings with coupling housings, consume valuable space in the nacelle.
Innovation Solution
A power transmission system that includes a main shaft driven by a wind turbine rotor, a support structure with bearings to constrain movements, a gearbox with a housing rigidly coupled to the support structure, and a flexible coupling between the main shaft and the gearbox input member, positioned at least partially within the main shaft to eliminate the need for a coupling housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flexible coupling surrounded by a coupling housing is used to connect the main shaft and gearbox input member, then the reliability of the power transmission system is improved by reducing sensitivity to alignment mistakes and parasitic forces, but the coupling housing consumes significant space in the nacelle
Solution Approach 1:
The patent merges the coupling housing function with the main shaft structure by positioning the flexible coupling entirely within the main shaft's interior cavity. The main shaft housing thus serves dual purposes: supporting the main shaft rotation and containing the flexible coupling, eliminating the need for a separate coupling housing and reducing overall space consumption in the nacelle.
Solution Approach 2:
The flexible coupling is nested within the main shaft's interior cavity, with the coupling positioned between the front bearing and the gearbox input member. This nested arrangement allows the coupling to be housed within the existing main shaft structure rather than requiring an additional external housing, effectively reducing the volume occupied by coupling components.
2Volume of moving object
If a flexible coupling is positioned entirely within the main shaft, then the space in the nacelle is significantly reduced, but the coupling must be integrated into the main shaft structure
Solution Approach 1:
The main shaft is segmented into functional zones: the interior cavity houses the flexible coupling, the front bearing supports the coupling assembly, and the coupling flange provides the connection interface. This segmentation allows each component to perform its specific function while being integrated into the compact main shaft structure, managing complexity through functional decomposition.
Solution Approach 2:
The main shaft is designed with multi-functionality: it serves as the rotating power transmission element, provides structural housing for the flexible coupling via its interior cavity, supports the coupling assembly through the front bearing, and provides the coupling flange for gearbox connection. This multi-functionality reduces the need for separate components, thereby reducing nacelle space while managing complexity through integrated design.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the reliability of the power transmission system by reducing sensitivity to alignment mistakes and other conditions that cause parasitic forces, while also providing significant space savings in the nacelle by eliminating the coupling housing.
Implementation Method 1
The gearbox input member is coupled to the main shaft with a translational degree of freedom along the main axis and rotational degrees of freedom about axes perpendicular to the main axis. The main shaft is coupled to the gearbox input member by a flexible coupling positioned at least partially within the main shaft.
Data Source
AI summary
A power transmission system for a wind turbine includes a main shaft configured to be driven by the rotor about a main axis, a support structure including at least one bearing supporting the main shaft for rotation about the main axis, and a gearbox having a gearbox housing rigidly coupled to the support structure and a gearbox input member coupled to the main shaft. The gearbox housing supports the gearbox input member for rotation about the main axis, and the gearbox input member is coupled to the main shaft with a translational degree of freedom along the main axis and rotational degrees of freedom about axes perpendicular to the main axis. The main shaft is coupled to the gearbox input member by a flexible coupling positioned at least partially within the main shaft. The flexible coupling may be positioned entirely within the main shaft.