Airbag Gas Generator Tablet With Vent Holes and Positioning Structures

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Solution Overview

Problem

Existing gas generating devices for automotive airbags have complex structures and large volumes, leading to high costs and inefficiencies in gas distribution.

Innovation Solution

A tablet and gas generator design featuring vent holes and positioning structures for stacking, along with a gas generator comprising an ignition chamber, gas generating chamber, and gas discharging chamber, where the gas generated flows through a buffer with vent holes to efficiently enter the airbag, simplifying the structure and reducing costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a complex gas production chamber structure is used, then gas generation reliability is improved, but device complexity and manufacturing cost increase

Engineering Contradiction:

Improvegas generation reliabilityVSAvoidgas production chamber structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The gas generator is divided into multiple independent tablets, each containing gas generating agents and oxidizing agents in separate compartments. This segmentation allows each tablet to function as an independent gas generation unit, simplifying the overall chamber structure while maintaining reliable gas generation through modular redundancy

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The tablet structure nests multiple functional components within a compact cylindrical form: the gas generating agent core is surrounded by oxidizing agent layers, which are in turn enclosed by a protective shell. This nested arrangement integrates multiple functions into a single compact unit, reducing structural complexity while ensuring reliable operation

Inventive Principle:

Principle #7Nested doll (Nesting)

2Reliability

If a complex gas production chamber structure is used, then gas generation reliability is improved, but manufacturing cost increases

Engineering Contradiction:

Improvegas generation reliabilityVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The tablet design uses inexpensive, readily available materials for the gas generating agents and oxidizing agents. Each tablet is designed as a disposable, single-use component that can be easily manufactured and replaced, reducing overall manufacturing costs while ensuring reliable performance through standardized design

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Productivity

If tablets are stacked with positioning structures, then gas flow efficiency is improved, but tablet structure complexity increases

Engineering Contradiction:

Improvegas flow efficiencyVSAvoidtablet structure complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The tablets feature asymmetric positioning structures with protrusions on one end and corresponding recesses on the other. This asymmetric design enables unidirectional stacking orientation, ensuring that vent holes align correctly for efficient gas flow while maintaining simple individual tablet structures. The asymmetry provides functional directionality without requiring complex bilateral features

Inventive Principle:

Principle #4Asymmetry

4Speed

If vent holes are provided in tablets, then gas discharge speed is improved, but structural integrity may be compromised

Engineering Contradiction:

Improvegas discharge speedVSAvoidtablet structural integrity

Core Design Contradiction:

SpeedVSStrength

Solution Approach 1:

The vent holes are strategically positioned and sized to provide optimal gas discharge pathways while maintaining structural integrity in critical areas. The tablet body material and thickness are optimized locally around the vent hole regions to ensure sufficient strength while allowing efficient gas flow through the designated openings

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The tablet structure incorporates controlled porosity through the vent holes, which are designed to provide adequate gas discharge pathways. The surrounding solid material maintains structural integrity, creating an optimized balance between porous gas flow paths and solid structural support

Inventive Principle:

Principle #31Porous materials

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 allows for quicker gas entry into airbags, improving safety and increasing the utilization rate of tablets, while simplifying the structure and reducing manufacturing costs.

Implementation Method 1

an igniter (220) and an ignition tablet (230) are disposed in the generator body (21)

Methodology Applied

Scientific EffectCombustion: Combustion

Implementation Method 2

a gas generating tablet (240) is disposed in the generator body (21)

Methodology Applied

Scientific EffectChemical reaction: Chemical Bonding

Data Source

PatentUS11214229B2Tablet, gas generator and gas generating device and manufacturing method thereof

Publication Date: 2022.01.04 HUBEI INST OF AEROSPACE CHEMOTECHNOLOGY

AI summary

A tablet, a gas generator and a gas generating device are provided, wherein the tablet comprise a tablet body, the tablet body comprises opposite first and second sides, the tablet body is provided with a vent hole running from the first side to the second side, the first side is provided with a first positioning structure, and the second side is provided with a second positioning structure that cooperates with the first positioning structure. By the smart design of the tablet structure, the present disclosure can effectively simplify the structure of the gas generator and reduce the manufacturing cost.