Movable Cowl Assembly for Aircraft Engine Pylon Access
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Solution Overview
Problem
Conventional aircraft engine pylons with fixed cowls are heavy, lead to airflow disturbances, and require complex structural reinforcement, making maintenance access difficult and inefficient.
Innovation Solution
A movable assembly of cowls, with two triangular cowls on either side of the engine pylon's longitudinal axis, allowing easy access and reduced airflow disruption, featuring a hinge system and locking mechanism for efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If removable flaps are provided on fixed cowls to access the engine pylon interior, then maintenance access is enabled, but the structure requires local reinforcement elements and remains complex
Solution Approach 1:
The patent applies the dynamics principle by transforming the fixed cowl structure into a movable one. The entire rear cowl assembly is made movable along the longitudinal axis of the engine pylon, allowing it to be displaced forward to expose the interior for maintenance. This dynamic approach eliminates the need for removable flaps and their associated reinforcement elements, as the whole cowl can be moved to provide access.
2Ease of manufacture
If multiple cowls are juxtaposed to form the aerodynamic cowling, then the cowl assembly can be constructed, but spaces and discontinuities appear between cowls causing airflow disturbance and acoustic phenomena
Solution Approach 1:
The patent applies the merging principle by reducing the number of separate cowl segments. Instead of using multiple juxtaposed cowls that create gaps and discontinuities, the invention uses a minimal number of cowls (ideally two) that can be moved and positioned to form a more continuous surface. This reduces airflow disturbance and acoustic phenomena while still allowing for manageable assembly and maintenance.
3Reliability
If a rigid structure is used to fix the cowls to the engine pylon, then the cowls are securely fixed, but the overall weight of the engine pylon increases
Solution Approach 1:
The patent applies the dynamics principle by replacing the conventional fixed rigid cowl structure with a movable cowl assembly. The cowls are mounted on movable supports that allow longitudinal displacement along the engine pylon axis. This dynamic system maintains secure fixation during normal operation while reducing the need for heavy permanent attachment structures, thereby reducing the overall weight of the engine pylon.
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
Facilitates easy maintenance access while minimizing structural complexity and airflow disturbances, resulting in a lightweight and aerodynamically optimized engine pylon design.
Implementation Method 1
for each lower movable cowl, a hinge system fixed between the lower movable cowl and the rear portion
Implementation Method 2
at least one locking system which locks the two lower movable cowls to one another in the closed position
Data Source
AI summary
An engine pylon of an aircraft having a rear portion, two rear cowls around the rear portion, each rear cowl having an upper fixed cowl and a lower movable cowl mounted articulated on the rear portion, wherein in the closed position the two lower movable cowls are moved close to one another, such that their lower edges are contiguous, wherein in the open position the two lower movable cowls are tilted such that their lower edges are moved away from one another, for each lower movable cowl, a hinge system fixed between the lower movable cowl and the rear portion, and at least one locking system which locks the two lower movable cowls to one another in the closed position. The presence of the lower movable cowls ensures, among other things, easy access to the interior of the engine pylon.