Gas Generator Cup-Shaped Container Fixation
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Solution Overview
Problem
Existing gas generators for airbag systems face challenges in reducing production costs and weight, particularly due to complex machining requirements and the crimping structure used for fixing components, which increases thickness and weight.
Innovation Solution
A gas generator design featuring a cup-shaped container with protruding portions that engage with a recessed tubular igniter-fixing portion, preventing axial movement and facilitating attachment, thereby reducing processing complexity and weight while maintaining a stable internal volume for consistent burning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a crimping structure is used to fix the cup-shaped container to the housing, then the fixation strength is improved, but the device weight and thickness increase
Solution Approach 1:
The fixing structure is segmented into multiple protruding portions distributed around the cup-shaped container's opening. Each protruding portion engages with a corresponding recess in the housing, distributing the fixation load across multiple points rather than requiring a thick crimped section. This segmentation allows for strong fixation without increasing overall wall thickness or weight.
Solution Approach 2:
The protruding portions of the cup-shaped container are nested within recesses formed in the housing. This nesting arrangement allows the container to be securely retained within the housing while maintaining a compact overall structure. The protruding portions fit into the recesses like nested elements, providing strong fixation without requiring additional material or increased thickness.
2Strength
If a crimping structure is used to fix the cup-shaped container, then the fixation strength is improved, but the processing complexity increases
Solution Approach 1:
The protruding portions are formed on the cup-shaped container during its initial forming process, before assembly with the housing. The recesses are similarly formed in the housing during its manufacturing. This preliminary formation of the fixing features eliminates the need for complex post-assembly crimping operations, significantly reducing processing complexity while maintaining strong fixation.
Solution Approach 2:
The protruding portions and recesses are designed to automatically engage with each other during assembly, providing self-fixing functionality. The cup-shaped container's protruding portions naturally fit into the housing's recesses, creating a secure connection without requiring complex external fixing mechanisms or multi-step processing operations.
3Stability of the object's composition
If the cup-shaped container is securely fixed to prevent axial movement, then the burning stability is improved, but the device complexity increases
Solution Approach 1:
The protruding portions and recesses serving structure perform multiple functions: they prevent axial movement of the cup-shaped container, provide secure fixation during assembly, and maintain the container's position during operation. This multi-functionality ensures burning stability without requiring separate dedicated components, thereby avoiding increased device complexity.
Solution Approach 2:
The fixing structure is merged with the basic geometry of the cup-shaped container and housing. The protruding portions are formed as integral features of the container wall, and the recesses are formed as integral features of the housing. This merging eliminates the need for separate fixing components, maintaining structural simplicity while ensuring stable positioning for consistent burning.
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 design simplifies processing, reduces weight, and ensures strong fixation of the cup-shaped container, preventing disconnection under pressure and ensuring stable burning of the transfer charge, while also allowing for uniform ignition of the gas generating agent.
Implementation Method 1
at least a distal end portion of the protruding portion of the cup-shaped container abuts on an inner wall surface of the recess of the tubular igniter-fixing portion to block an axial movement of the cup-shaped container
Implementation Method 2
an ignition device, which includes an igniter, and a gas generating agent being accommodated in the housing
Implementation Method 3
a cup-shaped container having a flame-transferring hole in a circumferential wall portion thereof
Data Source
Figure 1
Figure 2~3(b)
Figure 4(a)~5(b)
AI summary
The invention provides a gas generator for a restraining apparatus, including: a housing (10) an ignition device, and a gas generating agent accommodated (35,41) in the housing, and a cup- shaped container (20) having a flame - transferring hole (23) in a circumferential wall (27c) and being disposed on a tubular igniter- fixing potion (50) of the housing to form an ignition device chamber (24) accommodating the ignition device, the cup- shaped container having a plurality of protruding portions (25) protruding inward in the radial direction from the circumferential wall portion, the tubular igniter- fixing portion having a recess (53) on an outer surface, at least a distal end portion of the protruding portion engaging with an inner wall surface of the recess to block an axial movement of the cup -shaped container.