Disc Gas Generator Filtration Support for Axial Compactness
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Solution Overview
Problem
Existing disc-shaped gas generators for automotive safety devices have bulky internal structures and high costs due to thick plates needed to withstand combustion pressure, leading to increased weight and complexity.
Innovation Solution
A disc-shaped pyrotechnic gas generator with a simplified internal structure where the means of filtration supports the means of containment, reducing the thickness of containment components and eliminating the need for additional support, allowing for controlled deformation and leak-proof operation without bulky parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thick plates are used to withstand combustion pressure, then the structural strength and reliability are improved, but the weight and cost increase significantly
Solution Approach 1:
The containment means are segmented into multiple functional layers: filtration means, drainage means, and containment means with sealed edges. This segmentation allows each layer to perform its specific function efficiently, eliminating the need for a single thick plate to handle all requirements simultaneously.
Solution Approach 2:
The patent employs thin-film containment means with sealed edges that can withstand combustion pressure through their design geometry and material properties rather than thickness. The containment means feature sealed edges that anchor to the housing, creating a pressure-resistant structure without requiring bulky material.
2Strength
If thick plates and complex internal structures are used, then the structural integrity under pressure is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The internal structure is divided into distinct functional segments: filtration means for gas filtering, drainage means for liquid drainage, and containment means for pressure containment. Each segment is optimized for its specific function, simplifying the overall design while maintaining structural integrity.
Solution Approach 2:
The housing serves multiple functions: it contains the pyrotechnic substance, provides structural support, anchors the containment means through sealed edges, and facilitates gas diffusion through integrated diffusion holes. This multi-functionality reduces the number of separate components needed.
3Weight of moving object
If the thickness of containment means is reduced, then the weight and complexity are decreased, but the ability to withstand combustion pressure is compromised
Solution Approach 1:
The containment means are designed as thin-film structures with sealed edges that anchor to the housing. The sealed edges create a pressure distribution that allows thin material to withstand high combustion pressures through geometric design rather than material thickness.
Solution Approach 2:
The filtration means and drainage means act as intermediary structures between the combustion chamber and the containment means. These intermediaries distribute and manage the pressure loads, protecting the thin containment means from direct exposure to peak combustion pressures.
4Ease of manufacture
If simple internal structure without bulky parts is used, then the weight and manufacturing complexity are reduced, but the reliability of controlled deformation and opening may be compromised
Solution Approach 1:
The containment means are designed with specific geometric parameters and material properties that enable controlled deformation at predetermined pressures. The sealed edges and thin-film structure create a pressure-response system that reliably opens at the designed threshold while maintaining simplicity in overall 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
The solution results in a lighter, more cost-effective gas generator with improved axial compactness, repeatable and controlled rupture, and efficient gas diffusion, ensuring reliable ignition and inflation of safety devices without producing debris.
Implementation Method 1
the means of filtration are arranged in order to provide support to a supported portion of the means of containment at least at the start of the gas generator's operation
Implementation Method 2
a pyrotechnic substance arranged in the housing... in which the inflator gases are generated through the combustion of propellant
Implementation Method 3
the means of containment are configured in such a way that they can only reach a puncturing pressure in the presence of the means of filtration
Implementation Method 4
housing with diffusion holes
Data Source
AI summary
A disc-shaped pyrotechnic gas generator includes a housing with a plurality of diffusion holes. A pyrotechnic substance is arranged in the housing. A filter is arranged in the housing. A containment member is arranged in the housing between the pyrotechnic substance and the filter. A drainage member is arranged in the housing between the pyrotechnic substance and the containment member. The filter is to provide support to a supported portion of the containment member at a start of operation of the gas generator.