Aircraft Engine Attachment Load Transfer via Segmented Rings

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Solution Overview

Problem

Existing propulsion systems for aircraft, particularly those with turbojets attached under the wing, face challenges in efficiently transferring loads, which can affect the structural integrity and performance of the system.

Innovation Solution

A propulsion system design that includes a turbojet, a pylon with a rigid structure, and an engine attachment featuring a front ring and rear ring with connecting rods and a junction beam, allowing for uniform force transmission and improved load transfer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If traditional engine attachment with connecting rods and beams is used, then the turbojet can be attached to the pylon, but the load transfer efficiency is insufficient

Engineering Contradiction:

Improveload transfer efficiencyVSAvoidattachment structure complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The attachment structure is divided into multiple functional components: front engine attachment with connecting rods for lateral force transfer, rear engine attachment with triangular shackle for longitudinal force transfer, and thrust resumption device with beam and connecting rods for thrust force recovery. This segmentation allows optimized load paths for different force components.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The attachment system transitions from planar force transfer to three-dimensional load distribution. The front engine attachment operates primarily in the lateral dimension (Y-Z plane), while the rear engine attachment and thrust resumption device handle longitudinal forces (X-direction), creating a comprehensive 3D load transfer system that improves overall efficiency.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If multiple connecting rods and link points are used for engine attachment, then force distribution can be improved, but the structure becomes more complex

Engineering Contradiction:

Improveforce distributionVSAvoidnumber of link points

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The pylon structure serves multiple functions: it provides the rigid support framework, integrates the engine attachment points, and acts as the load transfer path to the wing. The front and rear engine attachments both provide structural support and force transfer, eliminating the need for separate dedicated force transfer components.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The engine attachment system merges the front engine attachment, rear engine attachment, and thrust resumption device into a unified integrated structure. The connecting rods and link points of different attachment systems are coordinated to work together, reducing the total number of separate components while improving force distribution.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS20250121946A1Propulsion system for an aircraft comprising a turbojet, a pylon and engine attachment

Publication Date: 2025.04.17 AIRBUS OPERATIONS (SAS)

AI summary

A propulsion system of an aircraft comprising a turbojet extending around a longitudinal axis and having a vertical median plane passing through the longitudinal axis and having a fan casing with a rear face perpendicular to the longitudinal axis, a pylon presenting a rigid structure with a front wall and a lower spar, and an engine attachment comprising a front ring coaxial with the longitudinal axis and comprising first fixation element for securing the front ring to the rear face of the fan casing and second fixation element for securing the front ring to the front wall of the pylon.