Rotor Lock Plate Load Transfer for Wind Turbine Main Bearing Service
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Solution Overview
Problem
The main bearing of wind turbines is one of the most stressed components, requiring frequent maintenance and repair, which is challenging due to its location on top of the tower and limited space within the nacelle, especially during replacements when the wind turbine is offshore or in rough terrain.
Innovation Solution
A wind turbine with a multi-part main bearing system that redistributes the weight and loads of the main shaft line, allowing the main bearing to become load-less by using a pin mechanism that connects the main shaft line via the rotor lock plate to the bed plate, thereby disengaging the multi-part main bearing from supporting the shaft line, facilitating maintenance and replacement procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the main bearing continuously supports the main shaft line, then the wind turbine operates reliably, but maintenance and replacement become extremely difficult due to the location and space constraints
Solution Approach 1:
The support function is segmented between the main bearing and the pin mechanism. The pin can be inserted to take over the support function, allowing the main bearing to be isolated and maintained without supporting the shaft line weight.
Solution Approach 2:
The pin acts as an intermediary element that can be introduced to redistribute loads. When inserted, the pin becomes a temporary load-bearing component that relieves the main bearing, enabling maintenance activities.
2Strength
If the main bearing is designed for high load capacity, then it can support the main shaft line, but maintenance requires complete disassembly and replacement due to space constraints
Solution Approach 1:
The system transitions from a static load-bearing configuration to a dynamic one where the pin can be inserted or removed. This allows the load path to change based on operational needs versus maintenance needs.
Solution Approach 2:
The pin mechanism is pre-positioned and can be quickly inserted to redistribute loads before maintenance begins, preparing the system for easy bearing replacement without complex disassembly procedures.
3Productivity
If the main bearing remains in position to support the shaft line, then operational continuity is maintained, but replacement parts and equipment cannot be accessed in the limited nacelle space
Solution Approach 1:
The support function is extracted from the main bearing and transferred to the pin mechanism during maintenance. This allows the main bearing to be removed or accessed without compromising shaft line support.
Solution Approach 2:
The pin serves as a mediator that temporarily assumes the support role, creating space and access conditions necessary for maintenance activities in the constrained nacelle environment.
Data Source
AI summary
A wind turbine has a main shaft line with a main shaft, a rotor hub, and a rotor lock plate having an opening for receiving a pin, and a nacelle having a bed plate. A multi-part main bearing has a housing, an inner ring, and an outer ring. A pin is moveable between a first, second, and third position, and is retracted from the opening in the first position so that the main shaft line is rotatable. The pin is inserted into the opening in the second position so that the main shaft line is not rotatable. In the third position, the pin is shifted and the main shaft line is supported by the pin such that the weight of shaft and loads on the main shaft are not transmitted through the multi-part main bearing but are transferred via the rotor lock plate and the pin to the bed plate.