Aircraft Door Mechanism Horizontal Sliding Motion
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Solution Overview
Problem
Current door mechanisms for pressurized aircraft cabins require costly and weighty aerodynamic seals and weight compensation devices, which can cause noise and friction issues during operation.
Innovation Solution
A door assembly that moves horizontally between closed and disengaged positions using a hinge arm, support bracket, link arm, and actuation mechanism, eliminating the need for vertical motion and aerodynamic seals, with guides and pins guiding the door's movement to disengage from the frame, allowing smooth operation without vertical lift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If vertical lift motion is used to open the door, then the door can be opened from the closed position, but aerodynamic seals and weight compensation devices are required which increase cost, weight, and friction
Solution Approach 1:
The patent extracts and eliminates the aerodynamic seal and weight compensation device from the door mechanism. By using a horizontal sliding motion guided by guides and pins, the door can be opened without requiring vertical lift motion, thereby removing the need for these additional components and reducing overall weight.
Solution Approach 2:
Instead of the conventional vertical lift motion for door opening, the patent inverts the approach by using horizontal sliding motion. This reversal of the motion direction fundamentally changes the mechanism requirements, eliminating the need for complex seal and compensation systems.
2Reliability
If aerodynamic seals are used to manage the gap between door and fuselage skin, then the door can be sealed, but cost and weight increase along with potential noisy fluttering
Solution Approach 1:
The patent removes the aerodynamic seal from the system by implementing a horizontal sliding door mechanism. The guides and pins ensure proper alignment and sealing without requiring the aerodynamic seal, thereby eliminating the source of noise and fluttering while maintaining sealing reliability.
3Ease of operation
If weight compensation devices are incorporated for manual door operation, then the door can be opened manually, but undesirable loads and friction are introduced into the mechanism
Solution Approach 1:
The patent extracts the weight compensation device from the mechanism by using horizontal sliding motion instead of vertical lift. This eliminates the need to counteract door weight during operation, significantly reducing the forces and friction involved in manual door operation.
4Ease of operation
If vertical lift motion is used, then the door can be opened, but a large gap between door and fuselage skin requires aerodynamic seals
Solution Approach 1:
The patent inverts the conventional vertical lift motion to horizontal sliding motion. This fundamental change in motion direction allows the door to remain closely aligned with the fuselage skin throughout the opening sequence, eliminating the large gap issue and the associated seal management complexity.
Data Source
AI summary
A door assembly (2) for an aircraft is moveable between a closed position and a disengaged position and comprises a door frame (6), a hinge arm (12) pivotally coupled to the door frame (6), and a door (4). A support bracket (14) pivotally supports the door (4) on the hinge arm (12). The door frame (6) and door (4) each comprise at least one stop (8, 10) configured to engage with each other to retain the door (4) within the door frame (6) in the closed position. At least one pin (18, 20; 38) is mounted on each side of the door (4) and at least first and second guides (28, 30; 40) are coupled to the sides of the door frame (6). Each guide (28, 30; 40) comprises a channel (24, 26; 43) receiving a pin (18, 20; 38).