Gas Turbine Gearbox Casing Segmentation for Core Access
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Solution Overview
Problem
The architecture of some gas turbine engines does not facilitate access to inner core components for inspection or maintenance, making it difficult to decouple and remove critical components like the gearbox casing segment from the bearing housing.
Innovation Solution
A gas turbine engine design featuring interconnected casing segments, where a gearbox segment with a radially extending flange is removably mounted to a bearing housing flange, allowing for easy decoupling and removal of the gearbox casing segment to access the engine's interior, and a method of assembling the engine by attaching mating flanges to position the bearing housing within the casing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the gas turbine engine uses a traditional integrated casing design, then the structural integrity and strength are maintained, but the accessibility to inner core components for inspection and maintenance is poor
Solution Approach 1:
The casing is divided into multiple separable segments including a bearing housing segment, a gearbox segment, and a turbine casing segment that can be independently removed. This segmentation allows maintenance personnel to access inner core components by removing only the specific segment containing the target component, rather than disassembling the entire casing structure.
Solution Approach 2:
The gearbox is extracted as a separate removable component from the bearing housing through the use of external mounting flanges. This extraction allows the gearbox to be removed independently for maintenance while the bearing housing remains in place, improving accessibility without requiring complete casing disassembly.
2Ease of repair
If the gearbox is permanently integrated into the bearing housing, then the structural stability is improved, but the ease of repair and maintenance is reduced
Solution Approach 1:
The connection between the gearbox and bearing housing is made dynamic rather than static. Mounting flanges with fasteners allow the gearbox to be securely attached during operation for stability, yet easily detached for maintenance. This dynamic connection adapts between operational and maintenance states.
Solution Approach 2:
The mounting flanges are pre-positioned on both the bearing housing and gearbox during manufacturing, with alignment features built in. This preliminary preparation ensures that when maintenance is needed, the gearbox can be quickly removed and reinstalled without complex alignment procedures, maintaining both stability and ease of repair.
3Productivity
If the bearing housing is positioned deep within the engine casing, then the structural compactness is improved, but the time and complexity for maintenance operations increases
Solution Approach 1:
The bearing housing is segmented as a separate removable unit from the main turbine casing. This segmentation creates a direct access path to the bearing housing through the removable segment, eliminating the need to disassemble multiple intermediate components and reducing both maintenance time and procedural complexity.
Solution Approach 2:
The removable bearing housing segment acts as an intermediary access point. Rather than requiring direct access to deeply positioned components, maintenance personnel can remove this intermediate segment to gain access to the bearing housing and associated components, simplifying the maintenance procedure.
Data Source
AI summary
A gas turbine engine includes a casing including a plurality of interconnected casing segments defining an outer surface of the casing. One of the casing segments is a gearbox segment enclosing a gearbox and having a gearbox flange extending radially outwardly from the outer surface of the casing. The engine includes a bearing housing enclosing at least one bearing and having an annular body with an inner segment disposed within the casing. The annular body having an extension segment extending radially outwardly from the inner segment to a bearing housing flange disposed radially-outwardly of the outer surface of the casing. The bearing housing flange is engageable with the gearbox flange to removably mount the gearbox segment to the bearing housing.