Airbag Cover Flap Retention via Hook-Shaped Bent Region
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Solution Overview
Problem
Existing airbag cover designs fail to securely retain the outer flap during the unfolding of the airbag cushion, risking it from being released into the passenger compartment.
Innovation Solution
The inner flap is bent outward with a V-shaped or U-shaped cross-section to create a hook-like feature that securely engages with the launch pocket wall, and additional material reservoirs in the form of folds or corrugations are incorporated to enhance retention and flexibility, using composite materials like thermoplastic polypropylene or polyester layers for increased strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the outer flap is secured to the launch pocket wall, then the outer flap is retained securely during airbag deployment, but the outer flap loses its ability to move freely for unfolding
Solution Approach 1:
The inner flap is divided into distinct functional zones: a fixed engagement region with hook-shaped bent end that anchors to the launch pocket wall, and a flexible region with folds and corrugations that allows movement. This segmentation enables different parts of the same component to fulfill contradictory requirements of stability and flexibility simultaneously.
Solution Approach 2:
Different regions of the inner flap are given different mechanical properties: the bent end region provides rigid engagement for secure retention, while the fold and corrugation regions provide flexibility for movement during deployment. This local differentiation of material properties resolves the contradiction between secure retention and movement capability.
2Strength
If the inner flap is made from composite material with plastic strips or fibers, then material strength is increased, but manufacturing complexity increases
Solution Approach 1:
The flaps are constructed from composite materials combining plastic strips or fibers (particularly thermoplastic polypropylene or polyester) with a plastic matrix. This composite structure provides enhanced strength and flexibility while maintaining compatibility with conventional molding processes, balancing performance requirements with manufacturability.
Data Source
AI summary
The invention relates to a covering assembly over the chute channel of an airbag comprising having an airbag through-opening, which is closed by an airbag flap and an, in particular sprayed-on, covering made of plastic and secured over the airbag flap, wherein the covering has at least one target break line at the edge of the airbag flap in order to enable the unfolding of the airbag cushion, and wherein the airbag flap is connected via a joining point to a flap support wall in a moulded manner, which is in contact with the inner side of the chute channel wall in a secured manner, wherein the inner-side end of the flap support wall is bent outwards with a V-shaped or U-shaped cross-section, and with these hook-shaped bent region, same is inserted in the plastic material of the chute channel wall or engages under the lower end of the chute channel wall.