Airbag Gas Generator Housing With Endothermic Heat-Suppressing Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing gas generators face challenges in efficiently suppressing temperature rise of the housing after actuation, which can lead to thermal influence on surrounding components, such as melting of the airbag due to high-temperature contact.
Innovation Solution
A gas generator with a temperature rise suppressing member containing an endothermic agent and a binder agent is provided on the outer surface of the housing, which absorbs heat through chemical or state changes to reduce the housing temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heat insulating member is provided on the housing surface to suppress temperature rise, then thermal protection is improved, but the contact stability and heat absorption efficiency are insufficient
Solution Approach 1:
The invention changes the chemical composition parameters of the heat insulating member by incorporating specific endothermic agents (uric acid, urea, ammonium carbonate, ammonium bicarbonate, or ammonium formate) in controlled amounts (0.1-10 wt% relative to gas generating agent). This compositional parameter change enables the material to undergo endothermic decomposition at specific temperature ranges, actively absorbing combustion heat and suppressing housing surface temperature rise while maintaining contact stability through the binder agent composition (0.1-10 wt% of total composition).
Solution Approach 2:
The invention creates a composite heat insulating member combining gas generating agent residues, endothermic agents, and binder agents in specific proportions. This composite structure leverages the synergistic effects of different materials: the binder agent provides structural integrity and contact stability, the endothermic agents provide active heat absorption through decomposition, and the gas generating agent residues form the base matrix. The composite material achieves both reliable contact and efficient heat suppression.
2Power
If the housing temperature rises due to combustion heat, then gas generation efficiency is improved, but thermal influence on surrounding components increases causing melting
Solution Approach 1:
The invention applies local quality by concentrating the endothermic heat absorption function at the housing surface layer where combustion heat is most intense. The heat insulating member is specifically applied to the outer surface of the housing, creating a localized thermal management zone. This allows the interior combustion chamber to maintain high temperature for efficient gas generation while the exterior surface is actively cooled through endothermic decomposition of the coating materials, preventing thermal damage to the airbag without compromising combustion power.
Solution Approach 2:
The invention converts the harmful combustion heat that would otherwise damage the airbag into a beneficial cooling mechanism. The endothermic agents in the heat insulating member decompose at specific temperature ranges, actively absorbing the excess combustion heat and transforming it into chemical potential energy. This process converts the harmful thermal influence into a controlled chemical reaction that protects surrounding components while allowing the combustion process to proceed efficiently.
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 effectively suppresses the temperature rise of the housing, preventing airbag melting and unwanted gas generation, while ensuring the airbag module assembly operates safely and efficiently.
Implementation Method 1
the temperature rise suppressing member includes an endothermic agent that absorbs heat of the housing by undergoing a chemical change or a state change
Implementation Method 2
the endothermic agent absorbs heat of the housing by undergoing a chemical change or a state change by heat of the housing
Data Source
AI summary
A gas generator includes a gas generating agent that generates gas by combustion, a housing made of metal and accommodating the gas generating agent therein, the housing having a gas discharge port formed therein, through which the gas is emitted to an exterior of the housing, an ignition device configured to ignite the gas generating agent by actuation; and a temperature rise suppressing member provided in contact with an outer surface of a housing to cover at least a part of the outer surface. The temperature rise suppressing member includes an endothermic agent that absorbs heat of the housing by undergoing a chemical change or a state change by the heat of the housing when a temperature of the housing rises due to combustion of a gas generating agent, and a binder agent present together with the endothermic agent such that the temperature rise suppressing member has flexibility.