Aircraft Cargo Door Hinge Rotation Forward of Joint Line
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Solution Overview
Problem
Conventional aircraft cargo doors require corner hinge access door panels for non-binding rotation, which increases part count, weight, and maintenance downtime, and can interfere with the fuselage during opening and closing.
Innovation Solution
An aircraft fuselage end cargo door mechanism that rotates about a hinge axis located forward of the major joint line, eliminating the need for corner hinge access door panels by using a hinge or pair of hinges to couple the cargo door to the fuselage, allowing for unarticulated monolithic surface rotation and reducing interference with the fuselage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If corner hinge access door panels are used to enable non-binding rotation of the cargo door, then the cargo door can rotate without interfering with the fuselage, but the part count increases
Solution Approach 1:
The patent removes the corner hinge access door panels from the conventional design, extracting the problematic components that increased part count while maintaining the essential function of non-binding rotation through a simplified hinge mechanism positioned forward of the major joint line
Solution Approach 2:
Instead of having the hinge positioned at the conventional location requiring access panels, the patent inverts the approach by positioning the hinge forward of the major joint line, allowing the door to rotate without interfering with the fuselage and eliminating the need for access panels
2Ease of operation
If corner hinge access door panels are used for cargo door rotation, then proper rotation is achieved, but the weight of the aircraft increases
Solution Approach 1:
The patent extracts and removes the corner hinge access door panels that contributed to aircraft weight, replacing them with a simpler hinge mechanism that achieves the same rotational function with reduced mass
3Ease of operation
If corner hinge access door panels are used to facilitate cargo door rotation, then the door can open without interference, but maintenance downtime increases
Solution Approach 1:
By removing the corner hinge access door panels and their associated mechanisms, the patent reduces the number of components that require maintenance, inspection, and potential replacement, thereby reducing maintenance downtime while preserving the rotational function
4Ease of operation
If the cargo door rotates about a conventional hinge axis, then the door can open, but it interferes with the fuselage
Solution Approach 1:
The patent inverts the conventional hinge positioning by placing the hinge axis forward of the major joint line instead of at the conventional location, which reverses the rotation path and eliminates interference with the fuselage while maintaining door opening functionality
Solution Approach 2:
The patent changes the spatial dimension of the hinge position from the conventional location to a forward position relative to the major joint line, creating a new rotational plane that avoids fuselage interference
Data Source
AI summary
An aircraft fuselage end cargo door mechanism including a hinge rotatably coupling an aircraft fuselage end cargo door to a fuselage. The hinge being coupled to both the aircraft fuselage end cargo door and the fuselage so that an entirety of an axis of rotation of the aircraft fuselage end cargo door, defined by the hinge, relative to the fuselage is located forward of an entirety of a major joint line between the aircraft fuselage end cargo door and the fuselage. An uppermost portion of the major joint line comprises a joint line radius where a portion of the joint line radius formed by the aircraft fuselage end cargo door pivots within another portion of the joint line radius formed by the fuselage.