Air Permeable Cap Adhesion Retention via Segmented Protrusions
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Solution Overview
Problem
The adhesion force between the foam and cover parts of air permeable caps for vehicles can weaken due to vibrations, leading to a degradation in the cap's ability to block water and dust ingress.
Innovation Solution
An air permeable cap design featuring a concave-convex adhesion retention part, with ring-shaped adhesion protrusions and grooves, and guide ribs with spacing protrusions to maintain adhesion force and improve ventilation by spacing the foam and membrane parts from the cover part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the air permeable cap uses a simple cylindrical structure, then the manufacturing is easy, but the adhesion force between foam part and cover part weakens due to vibration
Solution Approach 1:
The adhesion retention part is segmented into multiple adhesion protrusions distributed around the foam part, rather than using a single continuous structure. This segmentation allows the adhesion force to be distributed across multiple contact points, maintaining reliability while keeping the overall structure simple and easy to manufacture.
Solution Approach 2:
The adhesion protrusions are strategically positioned at specific locations where adhesion is most needed, creating local quality enhancement. The protrusions have specific shapes and sizes optimized for adhesion, while the rest of the structure remains simple cylindrical form, balancing manufacturing ease with adhesion reliability.
2Volume of moving object
If the foam part is placed close to the cover part, then the structure is compact, but the ventilation performance is reduced
Solution Approach 1:
The guide ribs extend in the axial direction (length dimension) to create spacing between the foam part and cover part, rather than relying solely on radial spacing. This dimensional approach maintains compact radial profile while ensuring adequate ventilation channels are preserved axially.
3Reliability
If the adhesion retention part has complex concave-convex structure, then the adhesion force is continuously retained, but the manufacturing complexity increases
Solution Approach 1:
The adhesion retention part uses discrete adhesion protrusions instead of complex continuous concave-convex surfaces. This segmentation achieves reliable adhesion through multiple contact points while keeping the structure simpler and easier to manufacture than fully complex surfaces.
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 solution ensures continuous retention of adhesion force between the foam and cover parts, maintaining the cap's functionality in blocking water and dust while enhancing ventilation performance by expanding the flow space between the cover and foam parts.
Implementation Method 1
a membrane part installed between the foam part and the cover part, and configured to block a flow of water through the ventilation hole and allow a flow of air through the ventilation hole
Implementation Method 2
an adhesion retention part coupled in a concave-convex shape to retain an adhesion force between the foam part and the cover part
Implementation Method 3
a foam part made of a rubber material such that the opening of the housing is inserted therein
Data Source
AI summary
An air permeable cap for a vehicle may include: a cover part formed in a cylindrical shape with a closed end part, and having a plurality of guide ribs radially formed on an inner circumferential surface thereof; a foam part inserted and installed in the cover part so as to be contacted with the guide ribs, and having a ventilation hole formed on one side thereof; a membrane part installed between the foam part and the cover part, and configured to block a flow of water through the ventilation hole and allow a flow of air through the ventilation hole; and an adhesion retention part coupled in a concave-convex shape to retain an adhesion force between the foam part and the cover part.