Turbofan Thrust Reverser Door Actuation Mechanism
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Solution Overview
Problem
Existing thrust reverser systems for turbofan engines, such as the dual-flow turbojet with a double-door reversing system, are complex and require a sophisticated mechanism, making them less efficient and more difficult to actuate.
Innovation Solution
A turbofan engine design featuring interior and exterior doors that simplify the mechanism by dissociating the movement of the mobile assembly from the exterior and interior doors, using a slider system with independent actuators and transmission systems to optimize the thrust reverser system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dual-flow turbojet with a double-door reversing system is used, then the thrust reversal function is achieved, but the mechanism becomes complex and difficult to actuate
Solution Approach 1:
The reversing system is segmented into independent inner door assembly and outer door assembly, each with separate actuators and transmission systems. This segmentation allows each component to be simpler and more reliable, while collectively achieving the thrust reversal function without requiring a complex integrated mechanism.
2Reliability
If the moving assembly is coupled with the doors in a integrated system, then the reversal function is achieved, but the actuation mechanism becomes sophisticated and less efficient
Solution Approach 1:
The system separates the moving assembly movement from the door movement through independent actuation systems. The inner door actuator and outer door actuator operate independently, eliminating the need for complex coupled mechanisms and improving actuation efficiency while maintaining reliable reversal function.
Solution Approach 2:
Independent transmission systems act as intermediaries between the actuators and doors, allowing the moving assembly to translate without directly coupling the door mechanisms. This intermediary approach decouples the movements, simplifying the overall actuation mechanism and improving efficiency.
Data Source
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AI summary
The invention relates to a turbojet engine comprising an engine, a fan casing and a nacelle (102) comprising a fixed structure (206) and a reversing system having a movable assembly (207) with a movable cowling (207a) and a frame (207b), wherein the movable assembly (207) is movable in translation on the fixed structure (206) between an advanced position and a retracted position to define a window between the secondary duct (208) and the outside of the nacelle (102), internal (104) and external (105) doors, a slide (214) movable in translation between a first position and a second position, wherein each door is mounted hinged by a rear edge on the slide (214) between a stored position and a deployed position, an actuator to ensure the translational movement of the slide (214) from the first position to the second position and an actuator to ensure the movement of the frame (207b) from the advanced position to the retracted position.