Airbag Cover Hinge Design for Smooth Door Opening
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Solution Overview
Problem
The existing airbag cover designs suffer from suboptimal opening performance due to the bending of the base material during the opening of the door portion, which affects the flexibility and efficiency of the hinge portion.
Innovation Solution
The airbag cover incorporates a flexible skin layer on the front surface and a hinge portion made of a softer synthetic resin retainer, with a space portion on the base material side, allowing the hinge to bend smoothly without bending the base material, and includes a breakable portion with a weak layer configuration for stable opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the base material and retainer are coupled by two-color molding, then the hinge portion can be formed as a thin flat plate shape, but the base material bends during door opening which reduces opening performance
Solution Approach 1:
The invention extracts the bending function from the base material by creating a space portion where the base material is not disposed. This allows the hinge portion to bend independently without the base material interfering with the bending motion, thereby improving door opening performance while maintaining the thin flat plate shape of the hinge portion.
Solution Approach 2:
The invention segments the hinge area by creating a space portion that separates the bending region from the base material. This segmentation allows the retainer's hinge portion to bend freely while the base material remains structurally intact in other areas, resolving the contradiction between shape maintenance and opening performance.
2Adaptability or versatility
If the hinge portion is made as a thin wall to ensure flexibility, then bending capability is improved, but the coupled base material portion also bends which limits further opening performance improvement
Solution Approach 1:
The invention extracts the bending action from the base material by providing a space portion where no base material is disposed. This allows the thin-walled hinge portion to bend without the base material being dragged along, fully realizing the flexibility advantage of the thin wall design and significantly improving door opening performance.
3Stability of the object's composition
If the base material is disposed continuously across the hinge area, then structural integrity is maintained, but the hinge cannot bend smoothly reducing opening performance
Solution Approach 1:
The invention extracts the base material from the hinge bending area by creating a space portion. This localized removal allows the hinge to bend smoothly while the base material remains intact in all other areas, maintaining overall structural integrity while enabling smooth door opening.
Solution Approach 2:
The invention applies local quality change by creating a space portion only in the specific hinge bending area, while maintaining base material disposition in all other areas. This localized modification allows bending where needed while preserving structural integrity where not needed, optimizing both door opening performance and base material integrity.
Data Source
AI summary
An airbag cover includes a base material, a retainer, an airbag cover main body, and a flexible skin layer. The door portion includes a door constituent portion of the base material, and a door support portion provided in the retainer and holding the door constituent portion. The retainer includes the door support portion, a peripheral edge portion disposed around the door support portion, and a substantially flat plate-shaped hinge portion disposed between the peripheral edge portion and the door support portion and bendable when the door portion is opened. The base material is provided with a space portion at a disposition portion of the hinge portion of the retainer, and the hinge portion is a non-disposition portion of the base material. A region of the hinge portion includes two layers of the hinge portion of the retainer and the skin layer bonded to the hinge portion.