Vehicle Roof Headliner Pre-Cut Section for Airbag Deployment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing roof airbag deployment systems can cause additional risks of injury to passengers due to the bending of sun visors and loss of rigidity in the trim during airbag deployment, particularly in frontal collisions.
Innovation Solution
A motor vehicle roof headliner with a pre-cut section of lesser mechanical resistance, configured to break during airbag deployment, which extends longitudinally and is designed to guide the airbag's forward and downward deployment without damaging surrounding decorative or functional elements like sun visors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the trim is made rigid to maintain structural integrity, then the structural strength is improved, but the sun visor moves during airbag deployment causing injury risk
Solution Approach 1:
The trim is segmented into a rigid portion and a flexible portion, allowing different regions to serve different functions. The rigid portion maintains structural integrity while the flexible portion allows controlled deformation to prevent sun visor movement during airbag deployment.
Solution Approach 2:
Different portions of the trim have different mechanical properties. The rigid portion provides structural support while the flexible portion provides deformation capability. This local differentiation of material properties resolves the contradiction between maintaining structural integrity and preventing injury.
2Ease of operation
If the trim is made flexible to allow airbag deployment, then the ease of deployment is improved, but the structural integrity is lost
Solution Approach 1:
The trim is divided into rigid and flexible portions, where the flexible portion enables easy airbag deployment while the rigid portion maintains overall structural integrity. This segmentation allows the system to achieve both deployment ease and structural strength.
Solution Approach 2:
The trim transitions from a static rigid structure to a dynamic structure with both rigid and flexible portions. The flexible portion dynamically deforms during airbag deployment while the rigid portion maintains structural support, achieving both deployment ease and structural integrity.
3Stability of the object's composition
If the lower wall is made rigid to support functional elements, then the stability is improved, but the airbag deployment is hindered
Solution Approach 1:
The lower wall is segmented into rigid and flexible portions, with the flexible portion allowing airbag deployment while the rigid portion supports functional elements. This segmentation resolves the contradiction between stability and deployment capability.
Solution Approach 2:
Different portions of the lower wall have different mechanical properties. The rigid portion provides stability for supporting functional elements while the flexible portion provides deployment capability. This local differentiation resolves the contradiction between stability and ease of deployment.
Data Source
Figure 1~4
Figure 5~7
AI summary
The invention relates to a roof lining (8) for a motor vehicle, comprising a panel (22) designed to fit the inner surface of the roof, said panel comprising: a central front opening (24) for attaching a control console; a transverse connecting strip (30) between two portions (26, 28) of the panel (22) lateral to the opening (24), said strip (30) being in front of the opening (24). The connecting strip (30) includes a pre-cut section (32) configured to break in the event of deployment towards the windshield (4) of an airbag housed at one of the lateral portions (26) between the lining (8) and the roof. The invention also relates to a motor vehicle comprising such a lining (8) and to the method for shaping the lining (8).