Faceted Lobular Threads for High Pullout Armored Mounts
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Solution Overview
Problem
Traditional threaded mount designs for armored vehicles fail to withstand extreme vibration, severe shock, and thermal cycling, leading to low pullout resistance and potential galvanic corrosion issues, resulting in structural integrity loss and unplanned repairs.
Innovation Solution
A faceted lobular threaded component with a series of discretely configured facets and lobes, providing a deep and coarse thread form with a lead-in geometry for aggressive engagement, combined with an adhesive and barrier gasket to enhance pullout resistance and prevent corrosion, is used to create a strong attachment point in armored vehicles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional threaded mount designs are used, then the structure is simple and easy to manufacture, but the pullout resistance is low and the mount fails under extreme vibration and shock
Solution Approach 1:
The thread form is segmented into multiple discrete lobes (typically 3-6 lobes) around the circumference of the shank, with each lobe having cutting faces that engage the panel material. This segmentation increases the number of thread engagement points and distributes the load across multiple lobes, significantly improving pullout resistance while maintaining a relatively simple overall structure that can be manufactured using conventional processes.
Solution Approach 2:
The lobular thread form introduces asymmetry through its multi-lobed cross-sectional geometry, where each lobe has cutting faces oriented at specific angles relative to the longitudinal axis. This asymmetric configuration creates interlocking engagement with the panel material, preventing rotational movement and enhancing resistance to vibration and shock loads.
2Reliability
If traditional threaded mounts are used in non-ferrous structures, then installation is straightforward, but galvanic corrosion occurs at the steel fastener interface
Solution Approach 1:
A non-ferrous insert body (made from aluminum, magnesium, or other non-ferrous materials) serves as an intermediary between the steel fastener and the non-ferrous panel structure. This intermediate component electrically isolates the steel fastener from direct contact with the panel, preventing galvanic corrosion while maintaining structural integrity and load-bearing capacity.
Solution Approach 2:
The threaded mount employs composite construction by combining non-ferrous materials for the insert body with steel fasteners. This material combination allows the use of lighter, corrosion-resistant non-ferrous materials in contact with the panel while retaining the strength of steel fasteners, and can include additional protective coatings or plating on the non-ferrous surfaces to further enhance corrosion resistance.
3Strength
If conventional thread forms are used, then the thread cutting process is simple, but the thread form is stripped out due to insufficient engagement with the panel material
Solution Approach 1:
The thread form is segmented into multiple discrete lobes (typically 3-6 lobes) around the circumference of the shank, with each lobe having cutting faces that engage the panel material. This segmentation increases the number of thread engagement points and distributes the load across multiple lobes, significantly improving pullout resistance while maintaining a relatively simple overall structure that can be manufactured using conventional processes.
Solution Approach 2:
The lobular thread form incorporates curved and rounded lobe profiles rather than sharp angular edges, allowing the cutting faces to gradually engage and deform the panel material during installation. This curvature distributes stress more evenly during thread formation and enhances the mechanical interlocking between the thread form and the panel, improving engagement strength.
Data Source
AI summary
A faceted lobular threaded component and methods for making and/or installing the same. A faceted lobular threaded component may include a head, and a shank extending along a longitudinal axis away from the head. The component may also include an external faceted lobular thread in the shank extending around the longitudinal axis. The external faceted lobular thread may include at least four facets per thread revolution, and at least four lobes per thread revolution circumferentially interspersed between the at least four facets and established by the at least four facets.