Head-Protecting Airbag Cover Sheet Segmentation for Window Debris
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Solution Overview
Problem
Conventional head-protecting airbag devices fail to prevent interference between the gas inflow portion and broken window pieces during deployment, as the cover sheets either cover only the vicinity of the gas inflow portion or not adequately protect the distant areas from the inflator connection.
Innovation Solution
A head-protecting airbag device with a flexible cover sheet attached to the bag body, where the cover sheet primarily covers the shielding inflatable portion, creating a non-covered area over the gas supply passage portion, allowing the inflation gas to flow without hindrance and protecting against broken window pieces by covering the shielding inflatable portion during deployment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cover sheet covers the gas supply passage portion to prevent interference with window side members, then the connection strength and structural integrity are improved, but the cover sheet cannot protect against broken window pieces during airbag deployment
Solution Approach 1:
The cover sheet is segmented into a covered area and a non-covered area. The covered area protects the gas supply passage portion to maintain connection strength, while the non-covered area allows protection against broken window pieces during deployment. This segmentation resolves the contradiction by dividing the cover sheet's function into two distinct zones.
Solution Approach 2:
Different regions of the cover sheet have different functional qualities. The covered area provides structural support and connection strength, while the non-covered area provides protection against broken window pieces. This local differentiation of quality allows the single cover sheet to address both contradictory requirements simultaneously.
2Object-affected harmful factors
If the cover sheet covers the entire gas inflow portion to protect against broken window pieces, then protection is improved, but material usage increases and deployment efficiency decreases
Solution Approach 1:
Instead of covering the entire gas inflow portion, the cover sheet applies partial protection only to the necessary areas. The non-covered area is strategically positioned to allow protection against broken window pieces while using minimal material. This partial action principle resolves the contradiction between protection and material usage.
3Strength
If the cover sheet is positioned to cover the gas supply passage portion, then connection strength is improved, but the shielding inflatable portion remains exposed to broken window pieces
Solution Approach 1:
The cover sheet is divided into functional segments: a covered area over the gas supply passage portion for connection strength, and a non-covered area over the shielding inflatable portion for protection against broken window pieces. This segmentation allows simultaneous satisfaction of both requirements.
Solution Approach 2:
The non-covered area of the cover sheet acts as an intermediary zone that allows the shielding inflatable portion to be protected by the airbag structure itself during deployment, while the covered area maintains connection strength. This intermediary approach resolves the contradiction by allowing different protection strategies in different zones.
Data Source
AI summary
A head-protecting airbag device includes an airbag including a bag body and a cover sheet, the bag body including a gas inflow portion. The gas inflow portion includes a gas supply passage portion and a shielding inflatable portion, the gas supply passage portion being located in an upper edge side of the bag body and configured such that an inflation gas initially flows through the gas supply passage portion, and the shielding inflatable portion being disposed below the gas supply passage portion and configured to be inflated to shield the window. The cover sheet is attached to the bag body such that the shielding inflatable portion, rather than the gas supply passage portion, is a protected area, by providing a non-covered area in an upper edge side of the gas inflow portion, the non-covered area being an area in which the cover sheet is not disposed.