Airbag Door Reinforcing Bracket for High-Pressure Deployment
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Solution Overview
Problem
Conventional door hinge structures for passenger airbags often fail to function normally when used with high explosive pressure airbags, as they break under the stress of expanding airbag cushions, particularly when designed for low-pressure airbags.
Innovation Solution
A reinforcing bracket is embedded around the hinge unit of the airbag door, featuring an H-shaped structure with base parts, side connection parts, and a center connection part, made of a harder material than the airbag door, to distribute and absorb the stress generated by the expanding airbag cushion, preventing the hinge unit from breaking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the airbag door is made from a single material integrated with the crash pad, then the appearance is improved and manufacturing is simplified, but the strength is insufficient when used with high explosive pressure airbags
Solution Approach 1:
The airbag door is constructed using composite materials: a base material (e.g., plastic) integrated with the crash pad for appearance and manufacturing simplicity, and a reinforcing material (e.g., metal bracket) embedded around the hinge unit to provide additional strength. This composite structure allows the door to maintain aesthetic integration while withstanding high explosive pressures from advanced airbags.
2Adaptability or versatility
If the airbag door is designed for low explosive pressure airbags, then it is sufficient for depowered airbags, but it breaks when used with high explosive pressure airbags
Solution Approach 1:
The reinforcing bracket is strategically positioned around the hinge unit where stress concentrates during airbag deployment. The bracket's curved geometry follows the contour of the hinge unit, allowing it to effectively distribute and absorb stress from both low-pressure (depowered) and high-pressure (advanced) airbags, thereby improving adaptability and reliability across different airbag types.
3Power
If the hinge unit is exposed to high stress from expanding airbag cushions, then the airbag can deploy effectively, but the hinge unit breaks without sufficient reinforcement
Solution Approach 1:
The reinforcing bracket is pre-installed around the hinge unit before airbag deployment, creating a protective reinforcement structure in advance. This bracket absorbs and distributes the high stress generated during airbag cushion expansion, preventing the hinge unit from breaking while allowing the airbag to deploy with full effectiveness.
Data Source
AI summary
A door hinge structure for passenger airbags, may include an airbag module installed inside a crash pad at a location spaced apart from the crash pad, and an airbag door having a hinge unit provided on an inner surface of the crash pad at a location facing the airbag module, wherein the airbag door may be provided with a reinforcing bracket, the reinforcing bracket being embedded in the airbag door at an area around the hinge unit, on which a stress may be concentrated when an airbag cushion deploys from the airbag module, thus increasing a strength of the airbag door.