Two-Layer Airbag With Protrusions For Impact Mitigation
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Solution Overview
Problem
Current airbag systems do not adequately mitigate the impact on passengers from the airbag itself during vehicle collisions and fail to prevent passenger rotation, leading to potential head damage.
Innovation Solution
The airbag design features a two-layer structure with an inner bag and an outer bag, where the outer bag has protrusion parts and an intermediate panel to reduce impact and rotation, along with a ventilation port system for efficient gas flow, and internal tethers to control deployment shape and reduce rotational forces on the passenger.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional single-layer airbag is used, then the structure is simple and weight is reduced, but the impact on the passenger from the airbag is not adequately mitigated
Solution Approach 1:
The airbag is divided into multiple independent layers (first airbag, second airbag, third airbag) with different functions. The first airbag provides primary protection, the second airbag reduces impact, and the third airbag prevents rotation. This segmentation allows each layer to be optimized for its specific function while collectively solving the overall protection problem.
Solution Approach 2:
The airbag system uses a nested structure where the second airbag is positioned between the first and third airbags, creating a multi-layered protective envelope around the passenger. This nested arrangement allows the different airbag layers to work together in a coordinated manner, with each layer contributing to the overall impact mitigation and rotation prevention.
2Object-affected harmful factors
If the airbag structure is simplified to reduce weight, then manufacturing is easier, but the ability to prevent passenger rotation is insufficient
Solution Approach 1:
The third airbag is specifically designed with localized features (such as positioning members or asymmetric structure) that target the rotation prevention function. This local quality enhancement allows the airbag system to address rotation without requiring a complete redesign of the entire structure, thereby minimizing the additional weight incurred.
3Reliability
If multiple airbags are added to reduce impact and prevent rotation, then passenger protection is improved, but the device complexity and weight increase
Solution Approach 1:
Each airbag layer is designed to perform multiple functions where possible. For example, the second airbag not only reduces impact but also contributes to preventing rotation through its positioning relative to other layers. This multi-functionality reduces the need for additional dedicated components, thereby limiting weight increase while maintaining comprehensive protection.
4Object-affected harmful factors
If the airbag structure is made more complex with multiple layers, then impact mitigation is improved, but manufacturing precision requirements increase
Solution Approach 1:
The airbag system incorporates pre-positioned features such as positioning members, guides, or pre-set geometric relationships between layers that ensure proper alignment during deployment. These preliminary structural arrangements reduce the precision requirements during manufacturing by providing self-aligning mechanisms that compensate for normal manufacturing tolerances.
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 effectively reduces passenger impact and rotation, allowing for suitable protection and weight reduction in the airbag system while ensuring proper inflation and deployment shape.
Implementation Method 1
generating gas from an inflator, injecting the gas into an airbag, and inflating and deploying the airbag
Data Source
AI summary
An airbag that includes an inner bag having a facing surface configured to face a passenger of a vehicle in the deployed state, an outer bag that surrounds the outer periphery of the inner bag with the facing surface exposed, and two protrusion parts which are provided in the outer bag and are respectively disposed on the left and right sides in the width direction of the vehicle with respect to the facing surface so as to protrude rearward. The inner bag and the outer bag may be partitioned by a common partition wall, with a ventilation port formed in the partition wall. Moreover, the inner bag and the outer bag may each be independent bag bodies, a ventilation port may be formed in both the inner bag and the outer bag, and the inner bag and the outer bag may be coupled around the ventilation port.