Gas Generator Filter Restraint via Protruding Housing
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Solution Overview
Problem
Conventional gas generators for vehicle restraining devices, such as airbag systems, fail to adequately secure the cylindrical filter during assembly, leading to instability and movement issues.
Innovation Solution
The integration of a housing with protruding portions on the diffuser and closure shells facilitates the secure positioning and restraint of the cylindrical filter, preventing movement through concaved annular corner portions that allow for a gap between the filter and gas discharge ports, enabling easy assembly and maintaining filter stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the filter is attached to the housing with a large contact surface area, then the filter is securely restrained, but the assembly complexity increases
Solution Approach 1:
The housing is divided into a diffuser shell and a closure shell that are joined together, with protruding portions formed at their boundary. This segmentation allows the filter to be restrained by multiple discrete protruding portions rather than requiring a large continuous contact surface, simplifying assembly while maintaining stability.
Solution Approach 2:
Protruding portions are introduced as intermediary structures at the boundary between the diffuser shell and closure shell. These protruding portions serve as mediators that provide restraint points for the filter, enabling secure attachment without requiring extensive contact surfaces between the filter and housing.
2Volume of moving object
If the filter is positioned close to the gas discharge port, then the structure is compact, but the filtration effectiveness decreases
Solution Approach 1:
The protruding portions are strategically positioned at the boundary between the diffuser shell and closure shell, creating localized restraint points. This allows the filter to be positioned optimally for filtration effectiveness while maintaining compact overall housing dimensions, as the restraint function is concentrated at specific locations rather than requiring uniform spacing throughout.
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 solution ensures the cylindrical filter is securely positioned and restrained, enhancing assembly efficiency and maintaining filtration and cooling effectiveness, while minimizing contact surface area for improved performance compared to existing structures.
Implementation Method 1
a gas generating agent 17 that generates gas on combustion
Data Source
AI summary
A gas generator for a restraining device includes a housing formed by joining and integrating a diffuser shell having a gas discharge port and a closure shell, and a gas generating agent, an igniter, and a cylindrical filter, accommodated inside the housing. The housing has a top plate, a circumferential wall surface, and a bottom plate, and a plurality of protruding portions concaved inwardly and formed with a distance from each other on at least either of an upper annular corner portion located at a boundary portion between the top plate and the circumferential wall surface and a lower annular corner portion located at a boundary portion between the bottom plate and the circumferential wall surface. Part of the cylindrical filter is supported and fixed by the plurality of protruding portions, and a gap is provided between an outer circumferential surface of the cylindrical filter and the gas discharge hole.