Trim Element Notch Design for Airbag Tear Control
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Solution Overview
Problem
Existing trim components for motor vehicle interiors, particularly those concealing airbags, suffer from tear faults due to plastics material penetration into notches, which compromises their functionality by forming a strong bridge between the skin's sides, necessitating additional production steps and strength issues.
Innovation Solution
The notch configuration is designed to prevent plastics material penetration by controlling the width and shape, ensuring the connection layer has a low thickness, and using a device with a robot arm and cutter to form notches with specific cross-sections, allowing the plastics material to either not penetrate or penetrate with low strength, maintaining the notch's functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the notch opening is made narrow to prevent plastics material penetration, then the notch functionality is maintained, but the manufacturing complexity increases
Solution Approach 1:
The notch configuration applies local quality by creating a specific geometric structure where the opening width is controlled to be narrow relative to the depth, and the connection layer thickness is minimized locally at the opening. This localized geometric control prevents plastics material penetration while maintaining the overall notch functionality for skin breakage separation.
2Object-affected harmful factors
If protective lacquer is applied to close the notch opening, then plastics material penetration is prevented, but additional production operations are required
Solution Approach 1:
The solution employs self-service by designing the notch geometry and connection layer thickness such that the structure itself prevents plastics material penetration without requiring external protective measures like lacquer application. The narrow opening and thin connection layer configuration inherently block the fluid plastics material while maintaining production simplicity.
3Ease of manufacture
If the notch opening is made wide to facilitate manufacturing, then production complexity is reduced, but plastics material forms a strong bridge compromising notch functionality
Solution Approach 1:
The invention applies parameter changes by precisely controlling the ratio between the notch opening width and depth, and by minimizing the connection layer thickness at the opening. This parameter optimization allows the notch to be manufactured effectively while preventing plastics material from forming a continuous bridge that would compromise the breakage separation function.
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
This solution eliminates the need for additional production operations, maintains the notch's functionality as a preferred breaking zone, and reduces production costs by ensuring the plastics material does not form a strong bridge within the notch, enhancing the tear resistance and operational effectiveness of the trim component.
Implementation Method 1
taking into account the wetting and surface tension properties of the skin and the plastics material used to shape the foam
Implementation Method 2
taking into account the wetting and surface tension properties of the skin and the plastics material used to shape the foam
Data Source
AI summary
A trim element having a visible side (12) formed of a skin (10), the element includes a skin (10) laid on a plastic foam (24) bonded to the skin by a continuous bonding layer (26) formed spontaneously at the skin-foam interface during the foaming operation, the skin (10) has a preferential rupture initiator comprising at least one scored feature. Throughout the region in which the scored feature lays, the bonding layer (26) is in contact only with the skin (10) and the foam (24), and, at the scored feature and in the direction of the thickness of the skin, the bonding layer (26) is laid over the opening with a thickness very much smaller than the depth of the scored feature.