Frontal Airbag Bead Design for Angular Crash Head Stability
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Solution Overview
Problem
Frontal airbags, especially passenger airbags, fail to provide adequate protection during angular crashes, as the head may slip laterally or rotate due to the force component acting perpendicularly to the vehicle's longitudinal axis, leading to inadequate restraint and potential injury.
Innovation Solution
A frontal airbag design featuring a contact panel with lateral beads and central beads of varying cross-sections and pressures, where the lateral beads provide additional stability and prevent lateral movement, while the central beads allow for easier immersion and reduce rotation, by creating a softer surface for the occupant's head to engage with.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the airbag uses a uniform contact panel surface, then the structure is simple and easy to manufacture, but the head may slip laterally or rotate during angular crash
Solution Approach 1:
The contact panel is designed with different local properties: lateral beads with larger cross-sections provide harder restraint at the edges, while central beads with smaller cross-sections provide softer surface in the center. This local differentiation allows the head to immerse centrally while preventing lateral slip, resolving the contradiction between protection effectiveness and structural simplicity.
Solution Approach 2:
The contact panel is segmented into multiple bead structures (lateral beads and central beads) with different functions. The lateral beads prevent lateral movement while central beads allow head immersion, creating a segmented restraint system that improves angular crash protection without requiring complete structural redesign.
2Reliability
If the contact panel uses high surface tension throughout, then lateral movement is restrained, but the head cannot immerse easily causing increased rotation risk
Solution Approach 1:
Different regions of the contact panel have different surface tensions: lateral beads maintain high surface tension to prevent lateral slip, while central beads have lower surface tension to allow head immersion. This local quality differentiation resolves the contradiction between restraining lateral movement and preventing head rotation.
3Reliability
If the airbag uses a single chamber with equal pressure, then the structure is simple, but cannot provide differentiated restraint forces across the contact panel
Solution Approach 1:
The airbag is divided into multiple chambers (first chamber for lateral beads, second chamber for central beads) with independent pressure control. This segmentation allows different pressure levels in different regions, enabling differentiated restraint forces while maintaining reasonable structural complexity through modular chamber design.
Data Source
AI summary
A frontal airbag for vehicle occupants, especially a passenger airbag, includes a contact panel (26) facing the vehicle occupant (12). Inside the airbag plural tethers (38) and/or partitions (38) are arranged which in portions withhold the contact panel (26) in the inflated state of the airbag (10) and form at least one lateral bead (34) and plural central beads (36) which in cross-section are smaller than the lateral beads (34). Furthermore, an airbag module is presented.