Aircraft Door Hinge Assembly Parallel Motion Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Aircraft door assemblies in commercial aircraft face challenges in maintaining the door parallel to the fuselage during opening and closing without obstructing the jetway, especially in pressurized cabins, where existing hinge systems are complex and inefficient.
Innovation Solution
A hinge assembly with angled arms, pivot shafts, and gear mechanisms that allow the aircraft door to move parallel to the fuselage by rotating about specific pivot points, maintaining a consistent distance from the fuselage surface during both opening and closing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional hinge system is used for aircraft doors in pressurized cabins, then the door can be opened and closed, but the door obstructs the jetway and does not remain parallel to the fuselage
Solution Approach 1:
The hinge assembly employs a dynamic mechanism with multiple arms (first arm, second arm, third arm) and pivot shafts that change the door's trajectory during opening and closing. The arms are angled at specific angles (e.g., 120 degrees) and rotate about pivot points to guide the door along a curved path, enabling it to remain parallel to the fuselage while opening and close without obstructing the jetway.
Solution Approach 2:
The hinge assembly introduces a complex rotational movement in multiple dimensions. Instead of simple hinge rotation, the door undergoes a compound motion involving rotation about multiple pivot shafts (first pivot shaft, second pivot shaft, third pivot shaft) and translation along a curved trajectory, allowing the door to maintain parallel alignment with the fuselage throughout the opening and closing sequence.
2Shape
If a complex hinge assembly with multiple arms and gears is used to maintain door parallel to fuselage, then door position is controlled, but device complexity increases
Solution Approach 1:
The hinge assembly merges multiple functional components into an integrated mechanism. The first arm, second arm, and third arm are connected through pivot shafts and gear mechanisms that work together as a unified system. The gear mechanisms (first gear mechanism, second gear mechanism) are integrated with the arms to synchronize their movements, reducing the need for separate control systems and simplifying the overall structure while achieving precise door positioning.
Solution Approach 2:
The hinge assembly components serve multiple functions simultaneously. The arms not only provide structural support but also guide the door's trajectory. The pivot shafts serve as both rotation points and structural connectors. The gear mechanisms simultaneously control the timing and synchronization of arm movements while also providing mechanical advantage for smooth operation throughout the opening and closing sequence.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A hinge assembly for use with a door, in particular, an aircraft door, that enables the door to remain substantially parallel to the fuselage of the aircraft when the door is open and closed. The hinge assembly includes a door support assembly that couples to the door, and a hinge arm assembly. The hinge arm assembly includes a first gear assembly that couples to the fuselage, a second gear assembly that couples the hinge arm assembly to the door support assembly, and a linkage assembly coupled to the first and second gear assemblies. The first and second gear assemblies and linkage assembly cooperate to move the door support assembly and hinge arm assembly with respect to each other to maintain the door substantially parallel to the aircraft when moving the door toward an open position.