Airbag Deployment Flap Friction Control
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Solution Overview
Problem
Existing airbag deployment mechanisms often result in simultaneous and uncontrolled deployment of upper and lower portions, which can lead to inefficient protection of vehicle occupants, as the airbag may deploy directly into contact with the occupant's head and upper torso.
Innovation Solution
Incorporating a first deployment flap made from high-density polyethylene, positioned between the upper and lower portions of the airbag, which restricts and delays the initial deployment of the lower portion, allowing the upper portion to deploy ahead at a desired angle, such as 45 degrees from the vehicle floor, thereby avoiding direct contact with the occupant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the airbag deploys simultaneously without control, then the deployment speed is fast, but the protection effectiveness deteriorates due to direct contact with occupant's head and upper torso
Solution Approach 1:
The airbag is divided into upper and lower portions that can deploy independently. The lower portion is folded and positioned over the inflator, while the upper portion is folded separately and positioned overlying the lower portion. This segmentation allows different deployment sequences and trajectories for each portion, enabling the upper portion to deploy ahead and avoid direct contact with the occupant's head and upper torso.
Solution Approach 2:
A deployment flap is introduced as an intermediary component between the fasteners and the airbag. The flap includes a frictional engagement surface that contacts the lower portion of the airbag, providing controlled resistance to its deployment. This intermediary mechanism allows the upper portion to deploy first while delaying and controlling the lower portion's deployment, achieving the desired deployment trajectory without complex electronic control systems.
2Reliability
If the lower portion deploys first, then the deployment sequence is simple, but the protection effectiveness deteriorates as the airbag may deploy directly into contact with the occupant
Solution Approach 1:
The deployment flap serves as a mechanical intermediary that selectively restrains the lower portion of the airbag during deployment. The frictional engagement surface on the flap creates sufficient frictional force to delay the lower portion's deployment while allowing the upper portion to deploy freely. This passive mechanical control achieves the desired deployment sequence without requiring active sensing or control systems.
Solution Approach 2:
The deployment flap is made from high-density polyethylene, a material selected for its specific frictional properties. By choosing a material with appropriate friction characteristics, the system exploits frictional engagement to control the deployment sequence. The frictional force is sufficient to restrain the lower portion initially but allows deployment once the upper portion has deployed and created the necessary space.
3Reliability
If the airbag deploys without trajectory control, then the deployment mechanism is simple, but the safety deteriorates due to uncontrolled contact with vehicle parts and occupant
Solution Approach 1:
The airbag is segmented into upper and lower portions with separate folding and positioning arrangements. The upper portion is folded separately and positioned to deploy upward and forward, while the lower portion is folded and positioned over the inflator. This segmentation enables independent trajectory control for each portion, allowing the upper portion to clear the instrument panel and steer wheel area before the lower portion deploys.
Solution Approach 2:
The deployment flap acts as a mechanical intermediary that guides the deployment trajectory. By positioning the flap between the fasteners and the lower portion, and providing a frictional engagement surface, the flap naturally guides the lower portion to deploy after the upper portion has cleared the critical area. This passive guidance mechanism achieves trajectory control without complex actuators or sensors.
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 configuration ensures the upper portion deploys above the occupant, while the lower portion deploys along the instrument panel, providing more effective protection by avoiding direct contact with the head and upper torso, and tailoring the deployment trajectory to enhance safety.
Implementation Method 1
The first deployment flap is at least one of formed from and coated with a material that provides a frictional engagement between the first deployment flap and the lower portion sufficient to at least partially restrict and delay the initial deployment of the lower portion
Data Source
AI summary
An apparatus for helping to protect an occupant of a vehicle includes an airbag, an inflator, a first deployment flap, and fasteners. The airbag includes an upper portion and a lower portion. In a stored condition of the airbag, the lower portion is rolled and/or folded and positioned at least partially overlying the inflator, the upper portion is rolled and/or folded separately from the lower portion and positioned at least partially overlying the lower portion, and the first deployment flap extends from the fasteners and has a portion positioned between the upper and lower portions of the airbag. The first deployment flap is at least one of formed from and coated with a material that provides a frictional engagement between the first deployment flap and the lower portion sufficient to at least partially restrict and delay the initial deployment of the lower portion.