Movable Cup Member Gas Generator Ignition Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing gas generators for air bags have complex structures that hinder weight reduction and simplification, while simpler designs often compromise on performance and require unnecessary fixing operations.
Innovation Solution
A gas generator with a housing, first and second combustion chambers separated by a movable cup member, where the cup member forms a gas discharge passage upon activation of the second ignition device, eliminating the need for fixing operations and enhancing ignition prevention by using an incombustible adiabatic member or adjusting the cup member's material/thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed partition wall or insulating member is used to separate combustion chambers, then ignition prevention is improved, but device complexity and weight increase
Solution Approach 1:
The cup member is designed to be movable rather than fixed, transitioning from a static structure to a dynamic one. The cup member moves axially under combustion pressure to automatically form a discharge passage, eliminating the need for complex fixing operations and insulating members while maintaining ignition prevention through controlled movement.
Solution Approach 2:
The cup member performs multiple functions autonomously: it separates combustion chambers, prevents ignition through its material properties (incombustible adiabatic material), and forms discharge passages through its own movement driven by combustion pressure. This self-service capability eliminates the need for additional insulating members and fixing operations.
2Device complexity
If a movable cup member is used to separate combustion chambers, then device complexity is reduced, but ignition prevention may be compromised
Solution Approach 1:
The cup member is made of incombustible adiabatic material that combines fire resistance with thermal insulation properties. This composite material approach ensures that the movable cup member maintains ignition prevention capability while enabling simplified structure and weight reduction.
Solution Approach 2:
The cup member's controlled movement is designed to maintain separation between combustion chambers during normal operation, with movement only occurring to form discharge passages. This dynamic design ensures ignition prevention is maintained while achieving structural simplification.
3Stability of the object's composition
If fixing operations are required for the second combustion chamber, then structural stability is improved, but manufacturing time and complexity increase
Solution Approach 1:
The cup member is designed to be self-stabilizing through its interaction with the igniter collar and housing structure. The cup member's position is maintained by its own geometry and interaction with surrounding components, eliminating the need for separate fixing operations and simplifying the manufacturing process.
Solution Approach 2:
The cup member's structural support function is merged with its combustion chamber separation function. The same component that separates chambers also provides structural stability through its interaction with the housing and igniter collar, eliminating the need for separate fixing mechanisms.
4Reliability
If multiple separate components are used for combustion chambers, then functional performance is improved, but weight increases
Solution Approach 1:
The cup member combines multiple functions into a single component: it acts as the separator between combustion chambers, provides thermal insulation, prevents ignition through its incombustible material, and forms discharge passages through movement. This merging of functions reduces the total number of components and overall weight while maintaining functional performance.
Solution Approach 2:
The use of incombustible adiabatic material in the cup member provides both structural integrity and thermal insulation in a single material, eliminating the need for separate insulating members and reducing overall weight while maintaining functional performance.
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 achieves a simplified structure, reduced weight, and maintained performance by eliminating the need for fixing operations and preventing unwanted ignition, while ensuring efficient gas discharge through a controlled passage.
Implementation Method 1
each of the combustion chambers being provided with a gas generating agent and an ignition device
Implementation Method 2
the cup member being moved upon activation of the second ignition device, thereby forming a discharge passage for a gas generated in the second combustion chamber
Implementation Method 3
enhancing ignition prevention by using an incombustible adiabatic member
Implementation Method 4
enhancing ignition prevention by using an incombustible adiabatic member or adjusting the cup member's material/thickness
Data Source
AI summary
A gas generator for an air bag includes a housing having a gas discharge port, a first combustion chamber and a second combustion chamber, each of the combustion chambers being provided with a gas generating agent and an ignition device, being in the housing, the second combustion chamber being separated from the first combustion chamber by a cup member disposed within the housing, the second gas generating agent and the second ignition device being disposed within the cup member, the cup member being moved upon activation of the second ignition device, thereby forming a discharge passage for a gas generated in the second combustion chamber.