Gas Generator Cup-Shaped Cover Member Residue Management
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Solution Overview
Problem
Existing gas generators for airbag apparatuses face issues where combustion residues adhere to the top plate of the housing, causing it to overheat, which can lead to the airbag melting and becoming inflamed upon deployment.
Innovation Solution
A gas generator design that includes a cup-shaped cover member between the cylindrical filter and the ignition device chamber housing, with a gap formed between the cover member and the ignition device chamber housing, preventing combustion residues from adhering to the top plate by directing them into the cover member, and optionally using a disk-shaped cover member to further prevent heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gas generating agent is burned to generate high-temperature combustion gas, then the airbag can deploy effectively, but combustion residues adhere to the top plate causing it to overheat
Solution Approach 1:
The housing is divided into a combustion chamber and a non-combustion chamber (accommodation chamber), separating the high-temperature combustion process from the airbag storage area. This segmentation prevents heat transfer to the top plate while maintaining effective airbag deployment.
Solution Approach 2:
A partition wall is introduced as an intermediary structure between the combustion chamber and the accommodation chamber. This partition wall acts as a thermal barrier, blocking the transfer of heat and combustion residues to the top plate while allowing the combustion process to proceed effectively for airbag deployment.
2Object-affected harmful factors
If the top plate is prevented from overheating by adding a partition wall and cover member, then airbag safety is improved, but device complexity increases
Solution Approach 1:
The partition wall serves multiple functions: it separates the combustion chamber from the accommodation chamber, blocks heat transfer to the top plate, and provides structural support. The cover member similarly provides both thermal protection and structural closure, reducing the need for additional separate components.
Solution Approach 2:
The cup-shaped cover member is nested within the housing structure, with its bottom surface abutting against the top plate and its circumferential wall forming a gap with the partition wall. This nested arrangement provides thermal protection while integrating smoothly into the existing housing geometry, minimizing additional complexity.
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 effectively suppresses the adherence of combustion residues to the top plate, preventing overheating and potential damage to the airbag, ensuring the airbag can deploy safely without melting.
Implementation Method 1
a cup-shaped cover member being further disposed between the cup-shaped ignition device chamber housing and the cylindrical filter... the ignition device chamber housing, the cylindrical filter, and the cup-shaped cover member being disposed such that an outer circumferential surface of the circumferential wall of the cover member abuts against an inner circumferential surface of the cylindrical filter, the bottom surface of the ignition device chamber housing is covered, from outside, by the bottom surface of the cover member, and a gap is formed between an inner circumferential surface of the circumferential wall of the cover member and an outer circumferential surface of the circumferential wall of the ignition device chamber housing
Data Source
AI summary
The present invention provides a gas generator, including an outer shell housing having a top plate, a bottom plate and a circumferential wall provided with a gas discharge port, a combustion chamber accommodating a gas generating agent, a cylindrical filter and an ignition device disposed in a cup-shaped ignition device chamber housing, the bottom surface of the cup-shaped ignition device chamber housing facing the top plate and an end surface of the opening thereof abutting against the bottom plate, a length from an upper end surface to a lower end surface of the cylindrical filter being shorter than a distance from the top plate to the bottom plate of the outer shell housing, and the cylindrical filter being disposed such that the upper end surface faces the top plate and the lower end surface faces the combustion chamber, a cup-shaped cover member which has a bottom surface, a circumferential wall and an opening, further being disposed between the cup-shaped ignition device chamber housing and the cylindrical filter.