Tire Valve Cap with ABS Insert for Material Compatibility
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Solution Overview
Problem
Existing tire valve caps face challenges in finding materials that do not react with valve threads while maintaining aesthetic and performance standards, as desirable exterior materials may react with common valve thread materials.
Innovation Solution
A two-piece cap assembly with a snap-fit engagement between a cap member and an insert member, both made from compatible materials like ABS plastic or metal, featuring a seal and recesses/protrusions for rotational fixation and easy assembly, ensuring secure fit and protection without unwanted separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a single-piece valve cap is made from a material desirable for exterior aesthetics, then aesthetic appeal is improved, but chemical reaction with valve thread material occurs causing reliability deterioration
Solution Approach 1:
The valve cap is divided into two separate pieces: an outer cap member and an inner insert member. The outer cap member can be made from materials optimized for aesthetic appeal, while the inner insert member is made from materials compatible with the valve thread, eliminating chemical reaction issues while maintaining visual appearance.
Solution Approach 2:
Different regions of the valve cap are made from different materials with different properties. The outer surface is made from aesthetically pleasing materials, while the inner threading region is made from chemically compatible materials, allowing each region to have the optimal material for its specific function.
2Ease of operation
If a two-piece cap assembly with snap-fit engagement is used, then ease of assembly is improved, but device complexity increases
Solution Approach 1:
The snap-fit engagement mechanism allows the outer cap member to be easily attached and detached from the inner insert member through a simple snapping motion, providing dynamic ease of assembly and disassembly without requiring complex fastening mechanisms.
Solution Approach 2:
The inner insert member is nested within the outer cap member, with the insert being received by a cavity in the outer member. This nesting arrangement allows the two-piece design to function as a unified assembly while maintaining ease of assembly through the snap-fit connection.
Data Source
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AI summary
A tire valve cap (10) having an ABS thread shield (12) that will not interact with the different metal valve stems used on today's vehicles. The ABS insert (14) uses a unique snap in ring design with anti-twist taps that hold the insert into an outer metal cap and at the same time will not twist around inside the cavity of the metal outer cap. Further, the cap includes a unique manner of holding the stem seal in place by using an over-molded in seal (e.g., square O-ring) that will not dislodge with use.