Explosive Tether Separator for Airbag Pressure Control
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Solution Overview
Problem
Existing airbag tether separation systems lack reliable and efficient methods to manage tether release, which can affect airbag internal pressure and stiffness, particularly during deployment.
Innovation Solution
An airbag tether separation system utilizing an explosive tether separator that produces shockwaves and/or heat energy to separate the tether into two pieces, with the explosive being operatively positioned to direct energy to a focus sleeve and the tether, ensuring effective separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tether separator is used to separate the tether during airbag deployment, then the airbag internal pressure and stiffness can be managed, but the system complexity increases due to the addition of explosive components and positioning mechanisms
Solution Approach 1:
The tether separator integrates multiple functions into a single component: the explosive charge, the focus sleeve for directing energy, and the tether positioning mechanism are combined into one integrated assembly. This merging reduces the number of separate parts while maintaining the ability to reliably separate the tether and manage airbag pressure.
Solution Approach 2:
The focus sleeve acts as an intermediary component that directs the explosive energy from the tether separator to the tether. This mediator ensures that the shockwaves and heat energy are concentrated on the tether material, guaranteeing reliable separation while allowing the separator itself to remain a compact, integrated unit.
2Reliability
If the tether separator is activated early in deployment, then the tether separation occurs promptly to manage pressure, but the airbag may lack sufficient initial stiffness for effective occupant restraint
Solution Approach 1:
The tether separator is pre-positioned and pre-charged within the airbag assembly, with the explosive already in place and the focus sleeve oriented to direct energy at the tether. All components are prepared in advance but remain inactive during initial deployment, allowing the airbag to inflate and establish stiffness before the tether separation action is triggered.
Solution Approach 2:
The tether separation is implemented as a discrete, time-based action that occurs at a specific moment during the deployment sequence. The explosive is activated after a controlled delay following airbag initiation, creating a periodic action pattern where inflation occurs first, followed by tether separation at the optimal moment to maintain both stiffness and pressure management.
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 system reliably and effectively releases the tether, allowing for controlled vent opening or closure, thereby managing airbag internal pressure and stiffness during deployment.
Implementation Method 1
The shockwaves and/or the heat energy can cause the tether to be separated into two pieces
Implementation Method 2
The shockwaves and/or the heat energy can cause the tether to be separated into two pieces
Data Source
AI summary
An airbag can include active vents to manage the pressure within the airbag when deployed. The active vent can be at least partially controlled by using a tether. A tether separator can be configured to separate the tether. The tether separator can include an explosive. The tether separator can be operatively positioned relative to the tether such that, when the tether separator is activated, the explosive produces shockwaves and/or heat energy. The shockwaves and/or the heat energy can cause the tether to be separated into two pieces. In some instances, a portion of the tether can be held in tension to facilitate the separation of the tether.