Aircraft High-Lift Wing Track With Cardanic Roller Mounting
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Solution Overview
Problem
Existing aircraft wing designs with roller bearings for high lift bodies experience misalignments leading to excessive wear and stress concentrations, shortening the lifespan of components.
Innovation Solution
A cardanic mounting system for roller units, allowing them to adapt their position and tilt relative to the engagement surface, using a cardanic frame assembly with universal joints for rotation in multiple axes, reducing stress concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed roller bearing is used to mount the track to the main wing, then the structure is simple and rigid, but misalignments cause excessive wear and stress concentrations that shorten component lifespan
Solution Approach 1:
The roller bearing is transformed from a fixed rigid mounting into a dynamic cardanically mounted system that can adapt its orientation. The cardanic mounting allows the roller bearing to rotate about two perpendicular axes, enabling it to dynamically adjust to misalignments between the track and main wing, thereby reducing stress concentrations and excessive wear while extending component lifespan.
Solution Approach 2:
The mounting system changes the operational parameters of the roller bearing by introducing two rotational degrees of freedom. This allows the roller bearing to change its orientation angles to match the actual alignment conditions, converting a static rigid connection into an adaptive system that accommodates manufacturing tolerances and operational deformations.
2Reliability
If a cardanic mounting system is used for roller units, then misalignments are accommodated and wear is reduced, but the device complexity increases
Solution Approach 1:
The cardanic mounting assembly acts as an intermediary between the fixed main wing structure and the movable track. This intermediate mechanism absorbs the misalignment issues by providing adaptive rotation capabilities, protecting the roller bearing and track from direct stress caused by rigid misalignment, thereby extending component lifespan despite increased local complexity.
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
The cardanic mounting system minimizes wear and maintains component longevity by adapting to misalignments, ensuring smooth movement and reducing stress concentrations.
Implementation Method 1
The cardanic frame assembly (132) comprises a first frame (136), a second frame (138) and a roller unit (120a, 120b). The roller unit (120a, 120b) is mounted to the second frame (138) so as to be rotatable about a roller rotation axis (134). The second frame (138) is mounted to the first frame (136) so as to be rotatable about a frame rotation axis (140) extending perpendicular to the roller rotation axis (134).
Data Source
AI summary
A wing having a main wing and a high lift assembly with a body and a connection. The connection movably connects the body to the main wing, such that the body is movable between a retracted position and at least one extended position. The connection comprises a track extending along a longitudinal axis between a first end and a second end and an intermediate portion between the ends. The first end and/or the intermediate portion is mounted to body, and the second end and/or the intermediate portion is mounted to the main wing by a roller bearing such that the track is movable along the longitudinal axis. The roller bearing has a roller unit mounted to the main wing and engaging a surface provided at the track so that the roller unit can adapt its tilt position with respect to the surface.