Airbag Discharge Portion Tack Stability via Belt Inversion
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Solution Overview
Problem
Existing airbag devices with discharge portions struggle to maintain stable internal pressure control during inflation due to the behavior of regulating belt portions, which can cause the tack portion to be peeled off, leading to unstable opening and closing of the opening portion.
Innovation Solution
An airbag device with a discharge portion featuring a tack portion formed by parallel outer and inner folds, and regulating belt portions disposed orthogonally to these folds, where the regulating belt portion is inverted to surround the tack portion and inserted into the base material, maintaining the folded state under tension and releasing it to open the opening portion when tension is removed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the regulating belt portion is disposed on the outer surface side with the tip end separated from the base portion side, then the structure allows easier manufacturing and assembly, but the tack portion becomes unstable and prone to peeling off under tension
Solution Approach 1:
The patent inverts the conventional arrangement by positioning the base end of the regulating belt portion on the inner surface side (connected to the airbag) and the tip end on the outer surface side. This inversion allows the belt to effectively restrain the tack portion without causing peeling, resolving the contradiction between ease of manufacture and closure stability.
Solution Approach 2:
The patent introduces a multi-layer stacked structure for the tack portion with inner, intermediate, and outer regions arranged in parallel folds. This dimensional reorganization creates a more stable configuration that resists peeling while maintaining manufacturability.
2Device complexity
If the regulating belt portion is disposed to pull inward the fold part under tension, then the structure simplifies the belt arrangement, but the opening portion cannot be stably closed despite internal pressure from inflation gas
Solution Approach 1:
By inverting the belt orientation and reversing which end connects to the airbag, the patent transforms the belt's action from pulling inward (causing peeling) to providing outward restraint (maintaining closure stability) while keeping the arrangement relatively simple.
3Reliability
If the tack portion is formed with parallel outer and inner folds creating stacked regions, then the opening portion closure stability is improved, but the device complexity increases
Solution Approach 1:
The parallel fold structure organizing material into inner, intermediate, and outer stacked regions adds structural complexity but achieves superior closure stability. The multi-layer configuration distributes stresses and prevents peeling, justifying the increased complexity for the reliability gain.
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 stable closure and accurate internal pressure control of the airbag during inflation, allowing for controlled venting and consistent protection performance based on occupant size detection.
Implementation Method 1
when the inflation of the airbag is completed, the tack portion is maintained in a folded state by the regulating belt portion due to tension acting on the regulation belt portion, so that a closed state of the opening portion is capable of being maintained, and when the tension does not act on the regulating belt portion, the folded state is released and the opening portion is brought into an open state
Data Source
AI summary
An airbag device includes an airbag formed with a discharge portion. The discharge portion includes: an opening portion; a tack portion around the opening portion; and a regulating belt portion disposed on a peripheral edge of the opening portion to regulate opening and closing of the opening portion. When the inflation of the airbag is completed, the tack portion is maintained in a folded state by the regulating belt portion due to tension acting on the regulation belt portion, so that a closed state of the opening portion is capable of being maintained, and when the tension does not act on the regulating belt portion, the folded state is released and the opening portion is brought into an open state.