Vehicle Door Trim Post Opening Engagement for Crash Delay
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Solution Overview
Problem
During a side impact crash event, conventional interior door trim panels in vehicles tend to detach immediately from the metal door frame, potentially interfering with the deployment of side impact air bags and failing to meet regulatory crash test standards, necessitating a solution to maintain attachment for a defined period.
Innovation Solution
The use of laterally spaced posts projecting from a belt bracket or directly from the interior door panel, which engage with openings in the metal door frame to delay the separation of the interior door panel upwardly, ensuring it remains secured during the crash, allowing for full deployment of the side impact air bag module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fastening methods are used to secure the interior door trim panel, then the panel remains attached during normal operation, but the panel detaches immediately during side impact crash events, interfering with air bag deployment
Solution Approach 1:
The fastening system is segmented into multiple independent attachment points (first plurality and second plurality of attachment points) distributed across the door trim panel. This segmentation allows the panel to remain attached at multiple locations during crash, preventing immediate detachment while maintaining a relatively simple overall structure.
Solution Approach 2:
The attachment points are pre-configured with specific structural features (such as recesses, protrusions, or interference-fit geometries) that engage before crash forces occur. This preliminary configuration ensures that the fastening mechanism is ready to resist upward forces immediately upon crash impact, delaying detachment until after air bag deployment.
2Reliability
If high strength BB-style threaded fasteners and metal clips are used to secure the door panel, then the panel remains attached during side impact, but the manufacturing cost and assembly complexity increase significantly
Solution Approach 1:
The attachment points utilize simple, cost-effective fastening features that can be integrated into the door trim panel and door panel structure during standard manufacturing processes. These may include molded-in attachment features, simple clips, or basic mechanical fasteners that provide sufficient crash performance without requiring expensive specialized components.
Solution Approach 2:
The attachment points are integrated into the existing door trim panel and door panel structures, combining the fastening function with the structural components themselves. This merging eliminates the need for separate, additional fastening hardware, reducing both manufacturing cost and assembly complexity while maintaining crash attachment reliability.
3Reliability
If the interior door trim panel is securely attached to prevent upward movement, then air bag deployment is not interfered with, but the panel cannot release after crash to allow access
Solution Approach 1:
The attachment points are designed with dynamic characteristics that allow them to maintain strong engagement during crash forces (resisting upward movement) but become disengageable after the crash event. This may involve friction-based engagement, cam-actuated release, or force-directional features that lock during impact but release when force directions change after deployment.
Solution Approach 2:
The attachment mechanism incorporates features that prevent premature release during normal operation and crash, but are designed to automatically release after the crash forces subside. This preliminary design ensures that the panel remains secured when needed (during crash) but becomes accessible when no longer needed (after deployment).
Data Source
AI summary
A vehicle door has a metal door frame having at least one opening, a decorative interior door panel, and at least one post projecting outwardly from an inner side of the decorative interior door panel. The post may have a length, cross sectional shape and cross sectional dimensions to engage within the opening when the decorative interior door panel is secured to the metal door frame. The post and the opening may cooperate to delay separation and movement of the decorative interior door panel upwardly and away from the metal door frame during a side impact crash on the vehicle door.