Igniter Assembly Metallic Collar Fixing Strength

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing igniter assemblies for gas generators face challenges in maintaining the fixation of the igniter housing during actuation, leading to potential detachment and maloperation of the gas generator.

Innovation Solution

The igniter assembly incorporates a combination of a cylindrical collar and an annular collar as the metallic collar, with the cup-like shaped igniter housing being fixed from the outside through specific surface abutments and annular grooves, ensuring secure attachment and preventing detachment during actuation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a single metallic collar is used to fix the igniter housing, then the structure is simple, but the fixing strength is insufficient leading to potential detachment during actuation

Engineering Contradiction:

Improvefixing strength of igniter housingVSAvoidstructure of metallic collar

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The metallic collar is divided into two separate collars: a first metallic collar that abuts against the igniter housing and a second metallic collar that abuts against the first metallic collar. This segmentation provides distributed fixation points and enhances overall fixing strength while maintaining structural clarity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The second metallic collar is positioned to abut against the first metallic collar, creating a nested arrangement where one collar supports another. This nested structure amplifies the fixing mechanism without requiring a completely new design, thereby improving reliability with controlled complexity

Inventive Principle:

Principle #7Nested doll (Nesting)

2Reliability

If the igniter housing is fixed from the inside, then the assembly is simple, but the fixation is insufficient during actuation

Engineering Contradiction:

Improvefixing strength of igniter housingVSAvoidfixation structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Instead of fixing the igniter housing from the inside, the patent inverts the approach by fixing from the outside using metallic collars that abut against the external surface of the housing. This inversion provides better mechanical support during actuation while maintaining assembly simplicity

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The fixation is enhanced by adding a dimensional aspect: the second metallic collar is positioned at a different location than the first collar, creating multi-point fixation in space. This spatial distribution of fixation points improves reliability without significantly complicating the structure

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS10196030B2Igniter assembly and gas generator using the same

Publication Date: 2019.02.05 DAICEL CORP

AI summary

The present invention provides an igniter assembly in which reliability in operation is enhanced.An igniter assembly includes an igniter main body, a resin portion enclosing a periphery of the igniter main body, a metallic collar being arranged on a periphery of the resin portion and integrated with the resin portion, a cup-like shaped igniter housing filled therein with a gas generating agent or a transfer charge. The metallic collar includes a combination of a cylindrical collar and an annular collar, and the cup-like shaped igniter housing abuts against a portion with a reduced diameter on the side of a first end portion of the cylindrical collar, thereby being fixed from the outside.