Jet Engine Pylon Attachment Layout for Lower Bypass-Flow Bulk
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Solution Overview
Problem
Existing propulsion assemblies for aircraft jet engines have bulkier engine attachments that limit the definition of aerodynamic shapes, particularly the internal and external cowlings, necessitating a more compact design.
Innovation Solution
A propulsion assembly with a jet engine, pylon, and attachment device featuring reduced bulk, utilizing a front engine attachment with lateral fastening points and link rods, and an intermediate engine attachment with pairs of link rods, each pivotally connected to reduce bulk and aerodynamic protrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If traditional engine attachments are used, then the engine is securely attached to the pylon, but the bulk of the attachments increases aerodynamic interference and limits cowlings design flexibility
Solution Approach 1:
The engine attachment system is divided into multiple independent link rods (front link rod, rear link rod, lateral link rods) that can be individually positioned and configured. This segmentation allows each component to be optimized for minimal bulk while collectively providing secure attachment, reducing overall aerodynamic interference and enabling greater cowlings design flexibility.
Solution Approach 2:
The attachment system transitions from a planar arrangement to a three-dimensional configuration using link rods positioned at various spatial locations (front, rear, lateral positions). This dimensional expansion allows the attachments to be distributed more efficiently in space, minimizing their projected bulk from any single viewpoint while maintaining structural integrity and attachment security.
2Shape
If traditional engine attachments are used, then the engine is securely attached to the pylon, but the aerodynamic shape definition is limited
Solution Approach 1:
The link rods are designed with slender, streamlined profiles that minimize aerodynamic disruption while maintaining structural strength. Their thin, elongated geometry allows them to be integrated into the aerodynamic flow more effectively than bulkier traditional attachments, enabling smoother cowlings contours and reduced drag without compromising attachment security.
Solution Approach 2:
The link rods are configured to accommodate dynamic loads and movements during flight operations. Their articulated connection points and flexible positioning allow the attachment system to adapt to varying aerodynamic conditions and engine movements, maintaining secure attachment while preserving the aerodynamic integrity of the cowlings shape.
Data Source
AI summary
The invention relates to a propulsion assembly having a jet engine with an intermediate casing with a rear face and a core casing to the rear of the intermediate casing, and an attachment pylon with a frontal wall and two lateral walls, a front engine attachment having a front fitting fastened in an articulated manner via two lateral fastening points to the rear face and in a rigid manner via an upper fastening zone to the frontal wall, and an intermediate engine attachment comprising a front link rod and a rear link rod on each side. Each of the link rods is mounted in an articulated manner between the front fitting and the lateral wall. With such an arrangement, the bulk of the engine attachments is reduced in the bypass flow.