Curtain Airbag Diffuser for Headliner Separation
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Solution Overview
Problem
Curtain airbags in vehicles often interfere with pillar trims or get damaged when unfolded between the headliner and the vehicle body, preventing proper deployment and passenger side protection.
Innovation Solution
A curtain airbag design featuring a main chamber with a diffuser having first and second outlets, an additional chamber connected to the second outlet to separate the headliner from the vehicle body, and a one-way vent portion to control gas flow, allowing the airbag to unfold without interference by first expanding the additional chamber and then the main chamber, ensuring proper deployment and passenger protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the curtain airbag is unfolded between the headliner and the vehicle body, then the side protection function is achieved, but the airbag interferes with the pillar trim causing improper deployment or trim damage
Solution Approach 1:
The airbag is divided into two separate chambers: a main chamber for side protection and an additional chamber positioned between the headliner and vehicle body. This segmentation allows the additional chamber to occupy the space that would otherwise cause interference with the pillar trim, while the main chamber provides the necessary protection function.
Solution Approach 2:
The invention introduces a new spatial dimension by adding the additional chamber in the vertical space between the headliner and vehicle body, rather than only expanding horizontally. This dimensional change allows the airbag to deploy without interfering with the pillar trim while maintaining protection capabilities.
2Object-affected harmful factors
If the additional chamber is added to separate the headliner from the vehicle body, then the airbag can unfold without interfering with the pillar trim, but the device structure becomes more complex
Solution Approach 1:
The additional chamber and main chamber are merged into a single integrated airbag structure with a shared inflator. The chambers are connected through the diffuser component, which serves both as a gas distribution system and as the interface between the two chambers, reducing the need for separate control systems.
Solution Approach 2:
The diffuser component serves multiple functions: it distributes gas from the inflator to both chambers, acts as a structural connector between the additional and main chambers, and helps control the deployment sequence. This multi-functionality reduces overall system complexity despite adding the additional chamber.
3Object-affected harmful factors
If the diffuser is designed with a joined portion that closes the first outlet, then gas flow is controlled to prevent trim interference, but the manufacturing process becomes more complex
Solution Approach 1:
The joined portion is pre-formed during manufacturing to close the first outlet. This preliminary action ensures that gas flow is automatically controlled in the correct sequence during deployment, preventing trim interference without requiring complex active control mechanisms during operation.
Solution Approach 2:
The joined portion is designed as a simple structural feature that can be easily formed during diffuser manufacturing, potentially using cost-effective methods like thermal bonding or adhesive application. The design prioritizes functional simplicity over manufacturing complexity.
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
The airbag unfolds between the headliner and the vehicle body without interfering with the pillar trim, ensuring effective protection of the passenger side without the need for additional anti-interference members, while maintaining efficient deployment and separation.
Implementation Method 1
the diffuser is configured to increase an amount of the gas supplied to the main chamber when the joined portion is opened by an internal pressure of the diffuser
Implementation Method 2
A one-way vent portion may be provided at the second outlet of the diffuser; and the one-way vent portion may allow gas movement from the diffuser to the additional chamber and block gas movement from the additional chamber to the diffuser
Data Source
AI summary
A curtain airbag for a vehicle may include: a main chamber installed between a headliner and a vehicle body and provided to be downwardly unfolded to the interior of the vehicle; a diffuser being provided at an inlet portion of the main chamber connected with an inflator, formed with a first outlet and a second outlet which receive and discharge gas from the inflator; and an additional chamber connected with the second outlet of the diffuser and communicated with the second outlet to receive gas from the diffuser and inflated between the headliner and the vehicle body to separate the headliner from the vehicle body. In particular, the diffuser includes a joined portion to close partially or fully the first outlet, and the diffuser increases the gas supply to the main chamber when the joined portion is opened by an internal pressure of the diffuser.