Side Airbag Wrapping Material with Variable Break Strength
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Solution Overview
Problem
Conventional side airbag systems fail to effectively prevent obstacles, such as occupants, from being pressed strongly by the inflating airbag when they are positioned too close to the airbag deployment area, as the break planned portion does not adequately restrain the airbag's initial projection.
Innovation Solution
A side airbag system with a wrapping material featuring a break planned portion that includes a high-strength and low-strength area, where the high-strength area temporarily restrains the airbag's projection and then breaks to allow full inflation, while the low-strength area quickly breaks to ensure timely deployment, with the low-strength portion positioned close to the airbag's exposed end to facilitate rapid inflation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the break planned portion is designed with uniform low break strength to enable quick inflation, then the airbag can deploy rapidly, but the obstacle close positioned state cannot be suppressed and the obstacle may be pressed strongly
Solution Approach 1:
The break planned portion is divided into different regions with different break strengths: a first break planned portion with low break strength for rapid breaking, and a second break planned portion with high break strength for temporary restraint. This local differentiation allows the airbag to quickly break at the first portion while the second portion temporarily restrains the airbag from pressing obstacles strongly.
Solution Approach 2:
The break planned portion is segmented into multiple functional zones along the airbag's projection direction. The first break planned portion (low strength) is positioned to break quickly, while the second break planned portion (high strength) is positioned to provide temporary restraint. This segmentation enables different breaking behaviors at different locations to simultaneously achieve rapid deployment and obstacle protection.
2Object-affected harmful factors
If the wrapping material is made strong to restrain the airbag projection, then the obstacle pressing force is reduced, but the inflation time is delayed
Solution Approach 1:
Different regions of the wrapping material have different break strengths: the first break planned portion has low break strength to break quickly and minimize inflation delay, while the second break planned portion has high break strength to provide temporary restraint and reduce obstacle pressing force. This local quality differentiation resolves the contradiction between restraint strength and inflation speed.
Solution Approach 2:
The wrapping material's break planned portion is segmented into multiple zones with different break strengths positioned at different locations. The low-strength first portion breaks rapidly, while the high-strength second portion provides temporary restraint, achieving both quick inflation and obstacle protection simultaneously.
3Loss of time
If the break planned portion breaks quickly to ensure timely deployment, then the inflation time is reduced, but the airbag may project too strongly and press obstacles
Solution Approach 1:
The break planned portion is segmented into a first portion that breaks quickly (low strength) and a second portion that breaks later (high strength). This segmentation creates a two-stage breaking process: rapid initial breaking for timely deployment, followed by temporary restraint from the second portion to prevent excessive projection and obstacle pressing.
Solution Approach 2:
The first break planned portion is designed to break preliminarily and quickly, initiating rapid inflation. The second break planned portion then provides temporary restraint before breaking, preventing excessive projection. This preliminary action sequence achieves both quick deployment and obstacle protection.
Data Source
AI summary
A side airbag system includes: an airbag; and a wrapping material that is disposed around a folded-up airbag body into which the airbag is folded so as to prevent the collapse of neatly arranged folds of the folded-up airbag body, the folded-up airbag body being configured as an elongated body having an external shape that is disposed so that a longitudinal direction thereof substantially follows an up-to-down direction, wherein: the wrapping material is disposed so as to wrap around the folded-up airbag body, including a brake planned portion capable of breaking when the airbag inflates which is provided on a front surface side of the folded-up airbag body so as to substantially follow the up-to-down direction; and the break planned portion comprises a low-strength portion where a break strength thereof is set low and a high-strength portion where the break strength is set high.