Airbag Inflator Gas Deflector Diffusion Design
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Solution Overview
Problem
Current airbag systems face issues with snap loading due to the direct and hot gas flow from inflators, which can lead to damage of the airbag cushion, such as breaking seams or tearing, and result in improper inflation, necessitating a solution to disperse and cool the gas effectively.
Innovation Solution
The introduction of a gas deflector assembly comprising a back plate and a front cover that encloses the gas exit portion of the inflator, with diffuser holes and slots to diffuse and cool the gas, reducing snap loading and increasing the robustness of the airbag cushion, while also allowing for cost-effective and adaptable design for left- and right-hand airbag cushions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If gas exits the inflator directly at high velocity and temperature, then the inflation speed is fast, but the snap loading damages the airbag cushion
Solution Approach 1:
A gas deflector is introduced as an intermediary component between the inflator and the airbag cushion. The deflector includes a diffuser portion with multiple holes that disperses the hot, high-velocity gas into multiple smaller jets, and a shield portion that blocks direct gas contact with the cushion. This mediator converts the harmful concentrated gas flow into a safer distributed pattern while maintaining inflation effectiveness.
Solution Approach 2:
The gas deflector segments the single high-velocity gas stream from the inflator into multiple smaller gas jets through the diffuser holes. This segmentation distributes the kinetic energy and reduces the concentrated snap loading on any single point of the airbag cushion, preventing damage while maintaining overall inflation speed.
2Object-affected harmful factors
If a diffuser component is added to disperse gas, then the snap loading is reduced, but the device complexity increases
Solution Approach 1:
The gas deflector combines multiple functions into a single integrated component: the diffuser portion with multiple holes for gas dispersion, the shield portion for blocking direct gas contact, and the mounting structure for attachment to the inflator. This merging reduces the number of separate components needed while achieving snap loading reduction.
Solution Approach 2:
The gas deflector serves multiple functions simultaneously: it diffuses gas to reduce velocity, shields the airbag cushion from direct hot gas contact, and provides a mounting interface for attachment to the inflator. This multi-functionality reduces the need for separate components and simplifies the overall system design.
3Ease of manufacture
If the gas deflector is made from a single piece, then the manufacturing is simpler, but the adaptability for left- and right-hand airbags is reduced
Solution Approach 1:
The gas deflector is divided into two separate halves that can be configured in different orientations. This segmentation allows the same component design to be adapted for both left-hand and right-hand airbag applications by simply changing the assembly orientation, providing versatility without requiring completely different components for each application.
Solution Approach 2:
The gas deflector design incorporates asymmetric features that allow it to function correctly in both left-hand and right-hand configurations. By designing the component with specific asymmetric characteristics, the same deflector can be installed in different orientations to match different airbag orientations, eliminating the need for separate left and right-specific components.
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 gas deflector assembly effectively disperses and cools the gas, enhancing the robustness of the airbag cushion, allowing for reduced weight, complexity, and cost by eliminating the need for additional reinforcement, and enabling the same components to be used for both left- and right-hand airbag cushions.
Implementation Method 1
a gas deflector assembled with two pieces is configured to diffuse, cool, and direct gas generated from the inflator
Implementation Method 2
a gas deflector assembled with two pieces is configured to diffuse, cool, and direct gas generated from the inflator
Data Source
AI summary
An inflator assembly arranged in an airbag system for use in a vehicle includes an elongated inflator with at least one mounting stud for mounting the inflator assembly in the vehicle and a gas deflector having a back plate and a front cover with at least one opening to diffuse gas generated from the inflator. The front cover is slid on the back plate along a longitudinal axis of the inflator such that the front cover is slidably engaged with the back plate to enclose a portion of the inflator. Further, the front cover and the back plate are securely engaged with each other by a crimp process to prevent opening or deforming of the gas deflector.