Side-Curtain Airbag Guide Ramp for Trim Protection
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Solution Overview
Problem
Existing side-curtain airbag deployment systems face issues with improper deployment and damage to trim components due to entanglement and fracturing, especially at low temperatures, as a result of the brittleness of plastic materials and increased forces from more powerful inflators.
Innovation Solution
The integration of a dual-ramped surface system, where a structural member and a trim component form a guide ramp with a first ramped surface of higher yield strength to direct the airbag during deployment, reducing contact forces and preventing entanglement, and minimizing damage to trim components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If trim components are made of plastic to guide the airbag during deployment, then the airbag can be guided during deployment, but the trim components may fracture during airbag deployment especially at low temperatures
Solution Approach 1:
A separate airbag guide component is introduced as an intermediary element between the airbag and the trim components. This guide is specifically designed with appropriate material properties and geometric features to redirect the airbag during deployment, preventing direct contact between the airbag and the trim components, thereby avoiding fracture while maintaining guidance functionality
Solution Approach 2:
The airbag guidance function is separated from the trim components. Instead of relying on the trim components themselves to guide the airbag, a dedicated guide component is used that can be optimized for this specific function without compromising the structural integrity or aesthetic requirements of the trim components
2Reliability
If more powerful inflators are used to eject the airbag at higher forces to meet safety standards, then the safety performance is improved, but the forces are sufficient to fracture plastic guides
Solution Approach 1:
The airbag guide acts as a mediator that distributes and redirects the high forces from powerful inflators. The guide is designed with appropriate force distribution features that prevent concentration of stress on single points, allowing it to withstand the high deployment forces while protecting other components
Solution Approach 2:
The guide component is designed with optimized geometric parameters including ramp angles, surface areas, and material selection that allow it to withstand high deployment forces. The parameters are specifically tuned to manage the force transmission from powerful inflators while preventing fracture
3Strength
If the strength of trim components is increased by using exotic materials and thicker panels, then the strength is improved, but the costs of the trim components increase
Solution Approach 1:
The functions of trim components are segmented: aesthetic and structural functions remain with the trim components using standard materials, while the airbag guidance function is assigned to a separate guide component. This allows each component to be optimized for its specific function without requiring expensive exotic materials throughout
Solution Approach 2:
The airbag guide component is designed as a cost-effective solution using standard materials that can be easily manufactured and replaced if necessary. Rather than making all trim components expensive and thick-walled, only the specific guide component requires enhanced design, keeping overall costs down
4Ease of operation
If sail cloth or tether is used to guide the airbag over trim components, then the airbag can be guided during deployment, but the sail cloth can catch behind the trim component causing damage
Solution Approach 1:
A rigid or semi-rigid airbag guide component serves as an intermediary structure that provides a controlled path for the airbag. Unlike flexible sail cloth, this guide maintains its shape and prevents the airbag from catching behind trim components, while being more structurally sound than tether alone
Solution Approach 2:
The airbag guide features curved ramp surfaces that smoothly redirect the airbag during deployment. The curved geometry eliminates sharp edges and corners where the airbag or sail cloth could catch, providing a continuous smooth path that prevents entanglement and damage
Data Source
AI summary
A side-curtain airbag assembly includes a body structure including a roof rail and a pillar extending downwardly from the roof rail. The roof rail has an upwardly extending side portion and a first ramped surface extending inwardly from the side portion at a downward angle. An airbag is mounted to the side portion above the first ramped surface. A trim component is mounted to the pillar below the first ramped surface and has a face, a top, and a second ramped surface extending outwardly from the top at an upward angle towards the side portion. The first and second ramped surfaces are arranged to form a ramp that guides the airbag during deployment of the airbag. The first ramped surface has a higher yield strength than the second ramped surface.