Igniter Holding Structure With Segmented Resin Moisture Barrier
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Solution Overview
Problem
In existing igniter holding structures for gas generators, the resin connecting the igniter and the connector insertion space tends to form thin portions, reducing strength and allowing moisture ingress, which can destabilize the gas generator's performance.
Innovation Solution
The igniter holding structure separates the resin for holding the igniter from the resin forming the connector insertion space, ensuring the resin remains thicker and preventing moisture entry by using a metal-exposed surface for connector insertion, thus maintaining a dry state within the gas generator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the resin for holding the igniter and the resin for forming the connector insertion space are connected inside the attachment portion, then the connector insertion space can be formed, but the resin thickness is reduced and strength is compromised
Solution Approach 1:
The resin is divided into two separate portions: a first resin portion that holds the igniter and a second resin portion that forms the connector insertion space. These two resin portions are kept separate inside the attachment portion, preventing the formation of thin resin sections and maintaining adequate resin thickness and strength in both functional areas.
2Ease of operation
If the resin is made thin to accommodate the connector insertion space, then the connector can be inserted, but moisture can easily enter through the thin resin portion
Solution Approach 1:
By segmenting the resin into separate portions for igniter holding and connector insertion, the resin maintains adequate thickness in both areas. The first resin portion remains thick enough to prevent moisture ingress while still allowing connector insertion through the second resin portion, thus maintaining both accessibility and moisture resistance.
3Volume of stationary object
If the resin thickness is reduced to form the connector insertion space, then the insertion space is sufficient, but the gas generating agent cannot be maintained in a dry state
Solution Approach 1:
The segmented resin structure creates distinct functional zones: the first resin portion maintains sufficient thickness to block moisture pathways, while the second resin portion provides the necessary connector insertion space. This segmentation ensures that the gas generating agent remains protected from moisture while accommodating the connector.
Data Source
AI summary
An igniter holding structure includes, an igniter provided with an ignition portion and a conductive pin, a first resin portion provided between the igniter and an attachment portion and holds the igniter such that the ignition portion and a distal end of the conductive pin are located opposite each other, and a second resin portion provided in a circumferential wall portion of the attachment portion and forming a connector insertion portion on an inner side of the circumferential wall portion, the connector insertion portion being a space into which a connector connected to the conductive pin can be inserted and the second resin portion being provided separated from the first resin portion on the inner side of the circumferential wall portion in a manner that an exposed surface, which is made of metal and exposed to the connector insertion portion, is formed in the circumferential wall portion.