Airbag Extensions for Non-Circular Steering Wheel Stability
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Solution Overview
Problem
Non-circular steering wheels in vehicles provide less surface area support for traditional airbags during both pre- and post-deployment, leading to ineffective energy absorption and movement issues during impacts.
Innovation Solution
An airbag system is designed with extensions and a baffle mechanism housed in the instrument panel, coupled to a non-circular steering wheel, which includes a first and second chamber with tethers to maintain central positioning and provide effective energy absorption by conforming around the steering wheel, supported by both the instrument panel and steering wheel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional airbag is used with a non-circular steering wheel, then the airbag can be deployed, but the airbag moves excessively during impact due to insufficient support surface area
Solution Approach 1:
The airbag extends in the lateral dimension with first and second extensions that wrap around the non-circular steering wheel, providing additional contact points and stability without increasing the forward deployment distance. This dimensional extension allows the airbag to anchor itself effectively around the irregular steering wheel shape.
Solution Approach 2:
The airbag is divided into multiple functional segments: a central chamber for occupant contact, first and second extensions for steering wheel anchoring, and third and fourth extensions for shoulder alignment. Each segment serves a specific purpose in maintaining positioning stability during deployment and impact.
2Adaptability or versatility
If the airbag is mounted in the steering wheel hub, then the airbag can deploy circularly, but it cannot effectively adapt to non-circular steering wheels with extra cabin space
Solution Approach 1:
The airbag structure transitions from a static circular shape to a dynamic multi-chamber configuration that adapts to the non-circular steering wheel geometry. The extensions and baffles allow the airbag to change its effective shape during deployment, conforming to the irregular steering wheel outline while maintaining structural integrity.
Solution Approach 2:
The airbag system nests multiple chambers within each other, with the first chamber containing the baffle and second chamber, and the extensions integrated into the overall structure. This nested configuration allows complex functionality to be achieved within a compact housing mounted in the instrument panel.
3Manufacturing precision
If the airbag inflates without extensions, then the deployment is simpler, but the airbag cannot maintain central positioning with respect to the steering wheel during inflation
Solution Approach 1:
The first and second extensions are pre-configured in the airbag structure before deployment, positioned to wrap around the steering wheel and establish lateral boundaries. This preliminary configuration ensures that as the airbag inflates, the extensions automatically guide and constrain the airbag to maintain central positioning without requiring active control mechanisms.
Solution Approach 2:
The steering wheel acts as an intermediary object between the airbag and the instrument panel mounting structure. The extensions wrap around this intermediary, using its non-circular shape as a physical guide to maintain proper airbag positioning and orientation during the deployment process.
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
The airbag system effectively positions itself centrally over the occupant, providing enhanced support and energy absorption during impacts, minimizing movement and ensuring safer deployment by utilizing the instrument panel and steering wheel for support.
Implementation Method 1
An airbag housing is in the instrument panel and includes an airbag and an inflator
Implementation Method 2
The baffle is positioned between the instrument panel and the steering wheel
Implementation Method 3
The airbag system has a plurality of tethers within the second chamber such that each tether is coupled between a central area of the lower side and a central area of the upper side
Implementation Method 4
assist in an effective energy absorption of the vehicle occupant during an impact
Data Source
AI summary
An airbag system includes an airbag and an inflator positioned in an instrument panel. The airbag includes a first chamber and a second chamber spaced from the instrument panel by the first chamber. A plurality of tethers is positioned within the second chamber. Each tether is coupled between a central area of a lower side and a central area of an upper side. A first and second lower extensions and a first and second upper extensions extend from the lower side and the upper side of the airbag, respectively.