Automatic Thrust Reverser Latch via Rack and Pinion
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Solution Overview
Problem
Existing latching systems for turbofan propulsion systems' thrust reversers are complex, cumbersome, and unreliable due to remote engagement requirements, which can lead to deflections and safety concerns during burst duct conditions.
Innovation Solution
An automatic locking mechanism using a rack and pinion system that engages and disengages a latch in response to the thrust reverser halves opening and closing, preventing deflections and allowing for easy access during inspection and servicing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If remote engagement latches are used to reinforce the IFS, then the structure is strengthened against burst duct conditions, but the system complexity and reliability deteriorate due to the complex and cumbersome remote engagement mechanism
Solution Approach 1:
The latch system automatically engages and disengages itself through the movement of the thrust reverser panels. When the panels close, the latch automatically engages to provide structural reinforcement. When the panels open, the latch automatically disengages. This eliminates the need for complex remote engagement mechanisms while maintaining the strength benefits during burst duct conditions.
Solution Approach 2:
The latch is pre-positioned and automatically engages as the thrust reverser panels close, preparing the structure in advance for potential burst duct conditions. The mechanical linkage ensures the latch is already in place before any pressure differential occurs, providing immediate structural reinforcement when needed.
2Reliability
If remote engagement latches are used to prevent deflections, then the sealing between IFS and engine is maintained, but the ease of operation deteriorates due to the inability to physically access the latch
Solution Approach 1:
The latch system operates automatically through the natural movement of the thrust reverser panels. The mechanical linkage converts panel movement into latch engagement and disengagement actions. This self-service mechanism maintains reliable sealing without requiring manual intervention, making the system easy to operate while ensuring sealing integrity during burst duct conditions.
Solution Approach 2:
The latch system transitions from a static, manually-operated mechanism to a dynamic, automatically-operating system. The latch engages and disengages in response to the dynamic movement of the thrust reverser panels, adapting its state based on operational conditions. This dynamic behavior maintains sealing reliability while simplifying operation.
3Stress or pressure
If existing latches are used to reinforce the IFS, then pressure containment is improved, but the ease of manufacture deteriorates due to the cumbersome integration into the structure
Solution Approach 1:
The latch system is merged with the thrust reverser panel structure itself. The mechanical linkage is integrated into the panel assembly, and the latch is positioned to work directly with the panel movement. This merging eliminates the need for separate, complex integration processes while maintaining effective pressure containment during burst duct conditions.
Solution Approach 2:
The latch system is divided into discrete, modular components: the latch itself, the mechanical linkage, and the integration points on the panels and pylon. This segmentation allows for easier manufacturing and assembly of individual components, which can then be integrated into the overall structure without requiring complex, monolithic manufacturing processes.
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
The automatic locking mechanism effectively limits deflections during burst duct conditions while enabling easy access for maintenance, enhancing safety and reducing the complexity of latching systems.
Implementation Method 1
The locking mechanism may comprise a rack and a pinion. The rack may be configured to rotate the pinion in a first direction in response to the first thrust reverser half closing. The rack may be configured to rotate the pinion in a second direction in response to the first thrust reverser half opening.
Data Source
AI summary
A nacelle may include a pylon and a thrust reverser having an inner fixed structure. A locking mechanism may automatically engage and prevent relative movement between a thrust reverser half and the pylon. A bumper may be coupled to the inner fixed structure. The locking mechanism may limit deflections between the thrust reverser and the pylon in response to a burst duct. The locking mechanism may allow the thrust reverser halves to be opened for access to the engine.