Igniter Lid Wall Structure to Protect Resin Tubular Walls
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Solution Overview
Problem
The existing igniter assembly structures, where a resin peripheral wall surrounds the igniter, are prone to deformation and damage due to the load exerted by the ruptured metal container, leading to potential loss of holding integrity and sealability issues.
Innovation Solution
The igniter assembly incorporates a metal container with a thicker outer peripheral region and a thinner central region in the lid wall portion, designed to minimize deformation and contact with a resin tubular wall, thereby reducing the load on the resin structure during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the lid wall portion is made thinner to reduce weight and facilitate rupture, then the igniter can operate more easily, but the ruptured lid wall portion may deform and damage the resin tubular wall portion
Solution Approach 1:
The lid wall portion is designed with non-uniform thickness: the central region is thinner to facilitate easy rupture during igniter operation, while the peripheral region is thicker to provide structural support and limit deformation. This local quality differentiation allows the lid wall to both rupture easily and protect the resin tubular wall portion from damage.
2Reliability
If the peripheral wall portion is surrounded by a resin tubular wall portion, then the igniter is securely held and sealed, but the resin structure may deform or crack under load from the ruptured lid wall
Solution Approach 1:
The thicker peripheral region of the lid wall portion acts as a cushioning element that absorbs and limits the deformation force during rupture. This beforehand designed thicker region prevents the resin tubular wall portion from experiencing excessive load that would cause deformation or cracking, thus protecting the secure holding and sealability structure.
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
This configuration inhibits large loads on the resin tubular wall, preventing cracks and damage, ensuring reliable holding and sealability of the igniter assembly.
Implementation Method 1
an ignition charge filled in an accommodating space defined by the peripheral wall portion and the lid wall portion
Implementation Method 2
the lid wall portion is deformed and opens on the emitting space side from one end portion of the peripheral wall portion as a starting point by the combustion pressure of the ignition charge
Data Source
AI summary
An igniter assembly includes an igniter including a container and an ignition charge. The igniter emits a combustion product of the ignition charge when a lid wall portion is ruptured upon operation of the igniter. The container includes a peripheral wall portion and the lid wall portion closing one end of the peripheral wall portion. The ignition charge is filled in an accommodating space defined by the peripheral and lid wall portions. A tubular wall portion surrounds the peripheral wall portion. The tubular wall portion defines an emitting space in which the combustion product is emitted. The lid wall portion includes an annular outer peripheral region portion connected to one end of the peripheral wall portion and a central region portion positioned inside the outer peripheral region portion in a radial direction. The outer peripheral region portion is formed thicker than the central region portion.