Gas Generator Metallic Cup Guide Portion Alignment
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Solution Overview
Problem
Existing gas generators for airbag deployment face challenges in assembly, particularly with press-fitting methods that can lead to deformation and damage of components due to misalignment and high assembly loads, making the process inefficient and prone to errors.
Innovation Solution
A gas generator design featuring a metallic cup member with a constant inner diameter and a metallic collar with specific dimensional relationships and guide portions, allowing for easy alignment and correction of axis displacement during assembly, reducing the risk of deformation and damage by facilitating a secure press-fitting process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If press-fitting method is used to fix parts without welding, then cost is reduced and assembling process is facilitated, but misalignment and high assembly loads cause deformation and damage of components
Solution Approach 1:
The guide portion is formed in advance on the collar member to provide alignment guidance before the press-fitting operation occurs. This preliminary structural feature ensures that the cup member and collar member are properly aligned during assembly, preventing misalignment-induced deformation and damage while maintaining the benefits of press-fitting without welding.
2Strength
If press-fitting is performed with high assembly loads, then secure fixing is achieved, but component deformation and damage occur
Solution Approach 1:
The guide portion is pre-formed on the collar member to establish proper alignment before the high-load press-fitting operation. This preliminary alignment feature allows the assembly process to apply sufficient fixing strength while preventing deformation and damage by ensuring correct positioning throughout the high-load assembly process.
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 design enhances the assembly efficiency and reliability of gas generators by minimizing the risk of component deformation and damage, ensuring a secure press-fitting process and reducing the likelihood of assembly errors, thus improving the overall performance and durability of the gas generator.
Implementation Method 1
an igniter main body, which includes an ignition portion and a electro-conductive pin, being integrated with a metallic collar by a resin
Implementation Method 2
the metallic cup member being fixed in a state in which an inner circumferential wall surface of the metallic cup member and an outer circumferential wall surface of the fixing portion are press-fitted
Data Source
AI summary
A gas generator includes, a housing with a gas discharge port, an igniter assembly and a gas generating agent in the housing; and a metallic cup of constant inner diameter covering the igniter to define a charging chamber. The igniter assembly includes a main body, including an ignition portion and an electro-conductive pin integrated with a metallic collar by a resin. The metallic collar has a fixing portion inserted into a hole in a bottom surface of the housing and a remaining portion projecting inward from the bottom surface of the housing, and a guide portion. An inner circumferential wall surface of the metallic cup and an outer circumferential wall surface of the fixing portion are press-fitted, and an annular gap is formed between the inner circumferential wall of the metallic cup member and an outer circumferential wall surface of the guide portion.