Dashboard Airbag with Segmented Convex Chambers

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Solution Overview

Problem

Conventional airbag devices face challenges in reducing the volume of inflatable bags while maintaining the necessary constraint property and energy absorption ability to protect occupants effectively, which affects the protective effect and increases production costs.

Innovation Solution

The airbag device features an inflatable bag with an upper convex chamber, a lower convex chamber, and a concave chamber, formed by a pull strap between them, with specific interior angles and adjustable borders, allowing for reduced volume and output of the gas generator while maintaining the protective surface area and energy absorption capability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If the volume of the inflatable bag is reduced, then the material usage and gas generator output are reduced, but the energy absorption ability and protective effect may decrease

Engineering Contradiction:

Improvevolume of inflatable bagVSAvoidenergy absorption ability

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The inflatable bag is divided into multiple independent convex chambers (first convex chamber, second convex chamber, third convex chamber, etc.) that are connected through communication channels. Each chamber can independently absorb impact energy through deformation, ensuring that the overall energy absorption ability is maintained even though the total volume is reduced. The segmentation allows for more efficient space utilization and energy distribution.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces vertical layering with multiple convex chambers arranged in different heights and positions (upper, middle, lower levels). This three-dimensional arrangement allows the airbag to maintain adequate protective surface area and energy absorption volume while reducing the horizontal footprint and overall material requirements. The multi-level structure optimizes the distribution of protective coverage.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Volume of moving object

If the size of the inflatable bag is reduced in equal proportion, then the volume is reduced, but the constraint property to the occupant and protection area cannot be ensured

Engineering Contradiction:

Improvevolume of inflatable bagVSAvoidprotection area

Core Design Contradiction:

Volume of moving objectVSArea of stationary object

Solution Approach 1:

The protective surface is segmented into multiple convex chambers that are strategically positioned to cover different areas of the occupant's body. Each chamber contributes to the overall protection area, and their distributed arrangement ensures comprehensive coverage without requiring a single large continuous surface. This allows the protection area to be maintained while the total volume is reduced through efficient spatial arrangement.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs vertical stacking of convex chambers at different heights to maintain adequate protection area. By arranging chambers in upper, middle, and lower levels, the airbag provides multi-level protective coverage that spans vertically, ensuring that the protection area requirement is met while reducing the horizontal expansion and overall volume of the device.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 reduces the volume of the inflatable bag by 20%-50% and the gas generator output by 20%-50% while ensuring the protective effect and energy absorption ability, thereby reducing production costs while maintaining the scope and effectiveness of occupant protection.

Implementation Method 1

gas generators supply gas to inflatable bags. Upon inflatable bags break up the door covers on surfaces of dashboards, inflatable bags inflate between dashboards and occupants to protect occupants

Methodology Applied

Scientific EffectGas generation and inflation:

Implementation Method 2

receives the impact of the occupant 3 at the same time and absorbs collision kinetic energy, thereby to reduce and decrease casualty of the occupant 3

Methodology Applied

Scientific EffectKinetic energy absorption:

Implementation Method 3

on both sides of the inflatable bag 1 are provided with a vent 9 separately for regulating an internal pressure of the inflatable bag 1

Methodology Applied

Scientific EffectPressure regulation:

Data Source

PatentUS10202094B2Airbag device mounted on dashboard

Publication Date: 2019.02.12 YANFENG AUTOMOTIVE SAFETY SYST CO LTD

AI summary

An airbag device mounted on dashboard, comprising an inflatable bag and a gas generator arranged inside a dashboard; wherein upon being filled with gas, the inflatable bag is provided with an upper convex chamber, a lower convex chamber and a concave chamber formed by a pull strap between the upper convex chamber and the lower convex chamber; rear of the upper convex chamber and the lower convex chamber are supported against a dashboard surface; and front of the upper convex chamber and the lower convex chamber form a protective surface. The inflatable bag of the airbag device has a reduced volume, and the gas generator matching the inflatable bag has a reduced output. Moreover, the inflatable bag can maintain the scope and effect of protection to occupant due to its adequate energy absorption ability.