Adjustable Engine Accessory Mount With Threaded Gap Tuning
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Solution Overview
Problem
The '3-2-1' mounting arrangement for aircraft engine accessories, while reducing stress and thermal expansion issues, often results in unsatisfactory dynamic behavior due to reduced stiffness, leading to unwanted vibrations, and can cause problems related to thermal expansion and stack-up after assembly.
Innovation Solution
An adjustable mount system comprising a first bracket coupled to the engine accessory with a first annular bushing and a second bracket coupled to the engine, connected by a threaded stud, allowing rotation of the bushings to adjust the axial gap between the brackets, thereby varying the relative positions and improving stiffness and alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a '3-2-1' mounting arrangement is used to reduce stresses and accommodate thermal expansion, then stress reduction and thermal expansion accommodation are improved, but stiffness is reduced leading to unwanted vibrations
Solution Approach 1:
The mounting bracket incorporates an adjustable mechanism that allows the distance between mounting points to be modified. This dynamic adjustment capability enables the system to optimize between stress accommodation and stiffness requirements based on operating conditions, resolving the contradiction by making the structure adaptable rather than fixed.
Solution Approach 2:
The invention changes the parameter of mounting point distance, allowing it to be adjusted rather than fixed. By modifying this geometric parameter, the system can achieve optimal performance for both stress reduction and stiffness, converting a static contradiction into a controllable variable.
2Strength
If constraints are added to attachment points to increase stiffness, then stiffness is improved, but issues related to thermal expansion and stack-up after assembly arise
Solution Approach 1:
The adjustable mounting bracket provides dynamic control over constraint levels. By allowing adjustment of the distance between mounting points, the system can modulate the degree of constraint applied, enabling sufficient stiffness while preserving the ability to accommodate thermal expansion and assembly stack-up.
Solution Approach 2:
The mounting system segments the constraint function across multiple adjustable mounting points. This segmentation allows independent adjustment of each mounting point's contribution to stiffness and thermal accommodation, enabling optimization of both competing requirements through distributed control.
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 adjustable mount system enhances the dynamic behavior of aircraft engine accessories by reducing vibrations and accommodating assembly tolerances, while maintaining structural integrity and stability.
Implementation Method 1
a threaded stud extending axially through the first annular bushing and the second annular bushing, the threaded stud threadably engaged with the threaded radially inner surfaces of the first and second annular bushings, wherein rotation of the first annular bushing and/or the second annular bushing varies the relative axial positions of the first and second bushings on the threaded stud
Data Source
AI summary
An adjustable mount for an aircraft engine accessory. A first bracket adapted to be coupled to the engine accessory has a first bore with a first annular bushing with a threaded radially inner surface extending through the first bore. A second bracket operatively coupled to the engine at mounting location has a second bore with a second annular bushing with a threaded radially inner surface extending through the second bore. A threaded stud extends axially through the first and second bushings and is engaged with their threaded inner surfaces. Rotation of the first and/or second bushings varies the relative axial positions of the first and second bushings on the stud, thereby adjusting an axial gap between first and second brackets. First and second nuts fastened to first and second ends of the threaded stud axially retain the mount together with the axial gap between the first and second brackets fixed.