Cylindrical Gas Generator Holder Assembly for Easier Manufacturing
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Solution Overview
Problem
The manufacturing of cylinder-type gas generators is complicated due to the complex shape of the holder, making it difficult to produce efficiently.
Innovation Solution
The gas generator is designed with a holder composed of three tubular components: a first holder made of resin, a second holder made of metal, and a third holder with a small-diameter portion, where the holders are fixed to the housing using diameter reduction processing and caulking, allowing for easier assembly and manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the holder is designed as a single complex component, then it can hold the igniter and fit the housing, but the manufacturing becomes complicated
Solution Approach 1:
The holder is divided into three separate tubular components (first holder, second holder, third holder) that can be manufactured independently using simple processes, then assembled together. This segmentation allows each component to have a simple geometry suitable for standard manufacturing methods while collectively achieving the complex functional requirements of the original single-holder design.
Solution Approach 2:
The three tubular holders are nested within each other (first holder containing second holder containing third holder), creating a compact multi-component structure. This nesting arrangement allows the complex holder assembly to be formed from simple individual tubes, resolving the contradiction between manufacturing simplicity and structural complexity.
2Reliability
If the holder components are fixed using diameter reduction processing, then the assembly is secure, but the manufacturing process becomes more complex
Solution Approach 1:
The housing undergoes localized diameter reduction processing at specific positions to create interference fits that securely hold the holder components. By changing the dimensional parameter of the housing at key locations, reliable fixation is achieved through simple radial deformation rather than complex fastening mechanisms, maintaining ease of manufacture while ensuring reliability.
3Reliability
If the second holder has a larger outer diameter in the contact portion, then the sealability with the housing is improved, but the holder assembly becomes more complex
Solution Approach 1:
The second holder features a localized increase in outer diameter at the contact portion that interfaces with the housing. This local quality change creates an effective seal between the holder assembly and housing without requiring the entire holder to be complex. The geometric modification is confined to the specific region where sealing is needed, maintaining simplicity elsewhere in the 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 design facilitates easier manufacturing, reduces weight, and improves the efficiency and reliability of the gas generator by enhancing the sealability and reducing the time to gas ejection, while maintaining structural integrity and reducing costs.
Implementation Method 1
a long cylindrical housing that is loaded with a gas generating agent that generates a gas by burning
Implementation Method 2
a portion of the contact portion of the second holder corresponding to a portion on a side of the first holder and a portion corresponding to the small-diameter portion of the third holder are subjected to diameter reduction processing from an outer side of the housing
Data Source
AI summary
To obtain a gas generator that is easier to manufacture than before. A gas generator 100 has a long substantially columnar outer shape, and includes a housing 10, a first holder 20, a second holder 25, and a third holder 53 attached near one opening end of the housing 10, an igniter 50 that is held by the second holder 25 and ignites a gas generating agent 31, a closing member 12 attached to the other end of the housing 10 so as to close the other opening end of the housing 10, and a filter 41. The second holder 25 is fixed to the housing 10 by forming a circumferential wall 10d and a circumferential wall 10e in a state where the second holder 25 is sandwiched between the first holder 20 and the third holder 53. The third holder 53 is fixed to the housing 10 by performing diameter reduction processing (caulking processing or the like) from an outer circumference to an inner side of the housing 10 at a position corresponding to an annular groove portion 54 to form the circumferential wall 10d.