Door Trim Head Impact Protection Airbag Carrier Integration
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Solution Overview
Problem
In vehicles where a head impact protection device cannot be integrated into the roof, such as open-top convertibles, conventional solutions require the airbag to be built into the door side trim, which poses challenges in deployment and visibility, and existing technologies lack efficient integration and easy assembly methods.
Innovation Solution
A vehicle door trim design featuring a curb carrier with a cutout for a head impact protection device, including an airtight airbag carrier, a gas generator, a foam layer, and a decorative layer, where the foam layer is elastic and lifts on actuation, allowing for seamless integration and deployment without visible weakening, enabling easy assembly and integration with the door structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the head impact protection device is integrated into the door side trim, then the device can be installed in open-top convertibles where roof integration is not possible, but the deployment mechanism becomes more complex and visibility of the integration is problematic
Solution Approach 1:
The airbag carrier is integrated within the curb carrier structure, with the airbag module nested inside the door trim's curb area. This nesting approach allows the head impact protection device to be compactly housed within the existing door trim geometry, enabling installation in open-top convertibles without adding external complexity
Solution Approach 2:
The door trim is divided into functional segments: the curb carrier containing the airbag carrier, the foam layer, and the decorative layer. This segmentation allows independent optimization of each component - the airbag carrier can be designed for deployment while the decorative layer maintains aesthetic appearance, resolving the complexity-visibility contradiction
2Reliability
If the foam layer is made sufficiently elastic to lift from the airbag carrier on actuation, then the deployment is effective and hidden, but the structural integrity of the door trim may be compromised
Solution Approach 1:
The foam layer is designed with differentiated properties: in the area of the cutout, it is sufficiently elastic to lift from the airbag carrier on actuation for effective deployment, while in other areas it maintains structural support for the door trim. This local quality variation resolves the contradiction between deployment effectiveness and structural integrity
Solution Approach 2:
The foam layer is pre-positioned to cover the airbag carrier in the installed state, providing a hidden and aesthetically pleasing appearance. Upon actuation, the pre-positioned foam layer is designed to automatically lift, providing effective deployment without requiring additional mechanical mechanisms that would compromise structural integrity
3Reliability
If the airbag carrier is joined to the curb carrier to be airtight, then the head impact protection device functions properly, but the assembly and manufacturing process becomes more difficult
Solution Approach 1:
The airbag carrier is integrated with the curb carrier as a combined unit, merging the sealing function with the structural carrier components. This integration eliminates the need for separate sealing assemblies and reduces the number of joining operations required, maintaining airtight sealing while simplifying manufacturing
Solution Approach 2:
The door trim utilizes composite construction with the curb carrier, foam layer, and decorative layer forming an integrated assembly. The airtight sealing is achieved through the composite structure itself, where the materials are joined to create both structural integrity and sealing functionality in a single manufacturing process
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 solution provides a hidden and efficient head impact protection system that deploys effectively, ensuring occupant safety without visible integration, simplifying assembly and reducing the need for additional fixing steps, while maintaining structural integrity.
Implementation Method 1
The foam layer is sufficiently elastic that it lifts from the airbag carrier on actuation of the head impact protection device
Data Source
AI summary
A vehicle door trim for a motor vehicle with a head impact protection device for a vehicle occupant is provided. In one embodiment, the door trim includes a curb carrier of the vehicle door trim in which is located a cutout for fixing the head impact protection device in the assembled position of the vehicle door trim in an area close to the side window of the vehicle door, a head impact protection device, which comprises an airbag carrier joined to the curb carrier so as to be airtight, an airbag, which on the rim side is fixed to the airbag carrier so as to be airtight, and a gas generator, which may be permanently joined to the airbag carrier. The vehicle door trim covers a foam layer over the curb carrier and, in the area of the cutout, over the airbag carrier. A decorative layer on the side of the foam layer facing away from the curb carrier is provided. The foam layer is designed so that on actuation of the head impact protection device, it may lift easily from the airbag carrier.