Anodized Torque Bar Spacer for Aircraft Wheel Heat Isolation
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Solution Overview
Problem
Aircraft brake systems face challenges in managing high thermal conduction from brake mechanisms to wheel rims during high-braking events, leading to increased temperatures and frictional loads, which existing torque bars do not adequately address.
Innovation Solution
A torque bar assembly with a spacer featuring anodized metal oxide layers on its surfaces, made from titanium or titanium alloys, is introduced to reduce thermal conduction by increasing thermal resistance and minimizing contact area between the torque bar and the wheel well.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a torque bar is attached to the wheel well without thermal insulation, then mechanical coupling strength is improved, but thermal conduction from brake to wheel increases
Solution Approach 1:
An anodized spacer is introduced as an intermediary component between the torque bar and wheel well. The spacer provides mechanical coupling while its anodized surface layer acts as a thermal barrier, reducing heat transfer from the brake assembly to the wheel. This mediator resolves the contradiction by simultaneously maintaining structural strength and blocking thermal conduction.
Solution Approach 2:
The torque bar assembly uses composite construction with a metal torque bar combined with an anodized spacer. The anodized layer creates a composite structure where the base metal provides mechanical strength while the oxide layer provides thermal insulation, achieving both strong coupling and thermal protection.
2Temperature
If the torque bar is spaced radially from the wheel well to reduce thermal conduction, then thermal resistance is improved, but mechanical coupling reliability deteriorates
Solution Approach 1:
The anodized spacer serves as a reliable intermediary that maintains the radial spacing needed for thermal resistance while providing a secure mechanical connection. The anodized surface enhances the reliability of this spaced connection through improved surface properties.
Solution Approach 2:
The anodization process changes the surface parameters of the spacer, creating a thicker, more reliable interface that maintains mechanical coupling strength even with radial spacing. The surface modification improves contact properties and reliability while preserving the thermal barrier function.
3Temperature
If an anodized metal oxide layer is applied to the spacer, then thermal resistance is improved, but manufacturing complexity increases
Solution Approach 1:
The anodization process is a surface treatment that changes the physical and chemical parameters of the spacer material. By controlling the anodization parameters (electrolyte composition, voltage, time), the thermal resistance can be optimized without fundamentally changing the manufacturing process flow, making the added complexity manageable.
Solution Approach 2:
The anodization process uses controlled oxidation (often with sulfuric acid or other electrolytes) to create the metal oxide layer. This accelerated oxidation process is a standard industrial technique that, while adding a manufacturing step, uses well-established chemistry to create the thermal barrier efficiently.
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 anodized metal oxide layers provide enhanced thermal resistance, reducing thermal conductivity by up to 30% and improving wear resistance, thereby mitigating heat transfer from the brake stack to the wheel well during braking events.
Implementation Method 1
the spacer includes a first anodized metal oxide layer on a first surface of the spacer configured to contact the torque bar... the first anodized metal oxide layer and the second anodized metal oxide layer have a thermal resistance greater than about one-half degree Kelvin per Watt
Implementation Method 2
the anodized metal oxide layers provide enhanced thermal resistance, reducing thermal conductivity by up to 30%... the first anodized metal oxide layer and the second anodized metal oxide layer have a thermal resistance greater than about one-half degree Kelvin per Watt
Data Source
Figure 1A
Figure 1B
Figure 2A~2B
AI summary
A torque bar assembly for use in an aircraft wheel is disclosed. In various embodiments, the assembly includes a torque bar (224); and a spacer (240) configured for positioning between the torque bar (224) and a wheel well (207) of the aircraft wheel and to thermally insulate the wheel well (207) from the torque bar (224), wherein the spacer (240) includes a first anodized metal oxide layer (250) on a first surface of the spacer configured to contact the torque bar (224). In various embodiments, the spacer (240) includes a second anodized metal oxide layer (252) on a second surface of the spacer configured to contact the wheel well (207).