Housing Ventilation Membrane Mounting to Prevent Insertion Root Cracks
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Solution Overview
Problem
Conventional ventilation members for housings are prone to cracking at the root of the insertion portion when elastically deformed and inserted into openings, leading to potential detachment from the housing.
Innovation Solution
The ventilation member features a support with a leg portion that includes insertion portions separated by slits and rounded portions between the inner and outer circumferential surfaces at the root, reducing stress concentration and preventing cracks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insertion portions are elastically deformed radially inwardly to be inserted into the opening, then the ventilation member can be fixed to the housing opening, but the inner circumferential surface of the insertion portion may crack
Solution Approach 1:
The patent applies curvature by forming rounded portions at the root of the insertion portion instead of sharp corners. This rounded geometry distributes stress more evenly during elastic deformation, preventing stress concentration that would cause cracks on the inner circumferential surface while maintaining the ability to elastically deform for secure attachment
2Ease of operation
If the insertion portion is made thin for easy elastic deformation, then insertion is easier, but the root area becomes more prone to cracking
Solution Approach 1:
The patent applies local quality by providing rounded portions specifically at the root area where cracks are prone to occur, while maintaining the thin-walled structure in other areas for ease of elastic deformation. This localized geometric modification strengthens the critical root area without compromising the overall flexibility and insertability of the insertion portion
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 rounded portions effectively prevent cracking at the root of the insertion portion, ensuring secure attachment and reduced risk of detachment from the housing while maintaining airflow and sealing.
Implementation Method 1
rounded portions each formed in a region between an inner circumferential surface of the insertion portion and a circumferential end surface of the insertion portion at a root of the insertion portion and having a rounded convex surface... stress is less likely to concentrate on the inner circumferential surface at the root of the insertion portion
Implementation Method 2
insertion portions being adapted to be elastically deformed radially inwardly when the insertion portions are inserted into the opening and then to be fixed to the opening
Data Source
AI summary
The ventilation member of the present invention includes: a support; and an air-permeable membrane disposed on the support. The support includes: a base portion supporting the air-permeable membrane; and a leg portion extending from the base portion toward the interior space of a housing and adapted to fix the ventilation member to the opening of the housing. The leg portion includes: insertion portions separated from each other in a circumferential direction by slits formed between the insertion portions, the insertion portions being adapted to be elastically deformed radially inwardly when the insertion portions are inserted into the opening and then to be fixed to the opening; and rounded portions each formed in a region between an inner circumferential surface of the insertion portion and a circumferential end surface of the insertion portion at a root of the insertion portion and having a rounded convex surface.