C-Shaped Composite Guide Rail for Thrust Reverser Weight Reduction
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Solution Overview
Problem
Existing aircraft gas turbine thrust reversal devices have guide rails that require significant space, are heavy, and complex to manufacture, limiting the possibility of attaching damping structures for soundproofing.
Innovation Solution
The implementation of oval, C-shaped guide rails with a slot-like opening and centrally arranged bearing lugs allows for a space-saving and lightweight design, accommodating larger rollers or slide elements and enabling additional installation space for damping structures, using composite materials for further weight and cost optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional guide rails are used for the thrust reverser, then the guide rail can provide sufficient structural support, but the guide rail requires a large amount of space and has high weight
Solution Approach 1:
The guide rail is manufactured using composite materials, specifically a plastic matrix reinforced with fiber reinforcement (such as carbon fiber or glass fiber). This composite construction provides sufficient structural support and load-bearing capacity while significantly reducing the weight compared to traditional metal guide rails. The fibers are oriented to optimize strength in critical directions, allowing the guide rail to maintain structural integrity during thrust reverser operation.
Solution Approach 2:
The guide rail cross-section is segmented into a C-shaped configuration with a slot-like opening, rather than using a solid rectangular or circular profile. This segmentation removes unnecessary material from low-stress areas while maintaining structural strength in critical regions. The C-shape provides adequate moment of inertia and load-bearing capacity with reduced material usage, directly reducing weight.
2Strength
If traditional guide rails are used for the thrust reverser, then the guide rail can provide sufficient structural support, but the guide rail requires a large amount of space
Solution Approach 1:
The high specific strength (strength-to-weight ratio) of composite materials allows the guide rail to achieve required structural support with a narrower cross-section. The fiber reinforcement provides exceptional strength in the direction of fiber orientation, enabling a more compact guide rail width while maintaining load-bearing capacity during thrust reverser deflection.
Solution Approach 2:
The C-shaped cross-section with slot-like opening concentrates material in regions that require strength (the outer flanges and web) while removing material from the center. This segmented configuration provides sufficient structural support with a narrower overall width compared to solid rectangular profiles, freeing up space in the engine cowling.
3Strength
If traditional guide rails are used for the thrust reverser, then the guide rail can provide sufficient structural support, but the guide rail is complex to manufacture and involves a great deal of weight
Solution Approach 1:
The guide rail is manufactured as a single integrated component using composite material forming processes, combining what would traditionally require multiple metal parts (web, flanges, reinforcement elements) into one monolithic structure. This merging simplifies manufacturing by eliminating welding, bolting, or riveting operations, and reduces assembly complexity while maintaining structural support.
Solution Approach 2:
Composite materials can be formed into complex C-shaped cross-sections with embedded fiber reinforcement patterns during the molding process itself. This allows the guide rail to achieve optimized structural support through integrated fiber orientation without requiring post-manufacturing assembly of reinforcement elements, reducing manufacturing complexity.
4Strength
If traditional guide rails are used for the thrust reverser, then the guide rail can provide sufficient structural support, but the possibility of attaching damping structures for soundproofing is considerably limited
Solution Approach 1:
The C-shaped cross-section with its slot-like opening creates an inherent cavity or channel within the guide rail structure. This segmented configuration provides internal space that can be utilized for routing cables, installing sensors, or attaching damping and soundproofing structures without increasing the external dimensions of the guide rail, thereby enhancing adaptability.
Data Source
Figure 1
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AI summary
The present invention relates to an aircraft gas turbine thrust reverser device with an engine 10, with an engine cowling 28, the rear section 30 of which is displaceable in the axial direction of the engine 10 from a closed forward thrust position to a rearwardly shifted thrust reverser position, in which a substantially annular clearance 31 is formed to a front, fixed section 29 of the engine cowling 28, wherein guide rails 33 are arranged on the engine cowling 28, in which bearing elements 37 are movable by means of rollers 36 or sliding elements, with which the rear section 30 of the engine cowling 28 is supported, characterized in that the guide rails 33 have an oval, C-shaped cross-section, provided on one longitudinal side with a slot-like opening 38 and are supported on opposite, centrally arranged bearing projections 39 formed integrally with the C-shaped cross-section.