Thrust Reverser Guide Rod Fastening to Inter-Compressor Casing
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Solution Overview
Problem
In aircraft propulsion assemblies with movable inner walls for maintenance access, the guide rods of the thrust-reverser cannot be fastened to the inner wall when the outer wall is of the 'O-duct' or 'C-duct' type, limiting maintenance and operation.
Innovation Solution
Fastening the guide rods of the thrust-reverser to the inter-compressor casing of the turbojet, allowing independent movement of the inner and outer walls and reducing structural impact, while using existing structures for force transmission without adding weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the guide rods of the thrust-reverser are fastened to the inner wall of the nacelle, then the thrust-reverser can be properly supported and controlled, but the inner wall and outer wall cannot move independently, limiting maintenance access
Solution Approach 1:
The patent introduces the inter-compressor casing as an intermediary structure between the guide rods and the inner wall. The guide rods are fastened to the inter-compressor casing rather than directly to the inner wall, allowing the inner wall to move independently for maintenance access while the inter-compressor casing provides stable support for the thrust-reverser mechanism
Solution Approach 2:
The patent segments the structural support system by separating the fastening points of the guide rods from the inner wall. By anchoring the guide rods to the inter-compressor casing instead of the inner wall, the system allows independent movement of the inner wall while maintaining thrust-reverser functionality
2Ease of repair
If the inner wall is made movable for maintenance access, then maintenance operations can be performed in the space between passages, but the guide rods cannot be fastened to the inner wall
Solution Approach 1:
The inter-compressor casing serves as a mediator that allows the guide rods to be fastened to a stationary structure while the inner wall remains movable for maintenance access. This intermediary structure eliminates the conflict between maintenance accessibility and structural support requirements
3Reliability
If additional structures are added to support the guide rods, then the thrust-reverser can be properly supported, but the weight of the nacelle increases
Solution Approach 1:
The inter-compressor casing is utilized for multiple functions: it serves as part of the turbojet structure, provides a mounting surface for the guide rods, and maintains the structural integrity of the nacelle. By using an existing multi-functional structure rather than adding dedicated support elements, the patent avoids increasing nacelle weight while ensuring proper guide rod support
Data Source
AI summary
An aircraft propulsion assembly including a bypass turbojet having a stationary inter-compressor casing positioned upstream from a space between passages, a nacelle including at its downstream end an inner wall that defines the outside of the space between passages and the inside of the bypass stream flow passage, and an outer wall arranged around the inner wall and that defines the outside of the bypass stream flow passage, at least a portion of the inner wall being suitable for moving between a maintenance position and a working position, and a thrust-reverser including a downstream element of the outer wall that is movable in translation between a retracted position and a thrust-reversal position in which it allows bypass stream deflector elements to be deployed in a radial direction, the deployment of the stream deflector elements being controlled by guide rods.