Airbag Diffuser With Interlocking Tubes for Directional Gas Flow
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Solution Overview
Problem
Existing diffusers for vehicle airbags do not effectively direct gases in specific, predetermined directions within the airbag, leading to inefficient inflation and potential particulate matter entry into the cockpit.
Innovation Solution
A diffuser design comprising a first tube with a bevel and a second tube with perforations and a notch, where the second tube is securely engaged with the first tube to positionally fix the outlets, allowing for directed gas flow and filtration upstream of the airbag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a known diffuser with circumferential holes is used to disperse gases, then gases are dispersed in multiple directions within the airbag, but the diffuser cannot direct gases in specific, predetermined directions
Solution Approach 1:
The diffuser is segmented into multiple outlets, each capable of being independently blocked or opened. This allows specific predetermined directions to be selected by blocking certain outlets while opening others, providing directional control without requiring a completely different diffuser structure for each direction.
Solution Approach 2:
The diffuser incorporates movable blocking members that can dynamically block or unblock specific outlets. This dynamic capability allows the diffuser to adapt gas flow directions in real-time, transforming a static structure into a dynamically controllable system that can direct gases in specific predetermined directions as needed.
2Object-affected harmful factors
If existing diffusers are used without filtration, then gas flow is simple and direct, but particulate matter can enter the cockpit
Solution Approach 1:
The filtration function is merged with the gas dispersion function in a single integrated diffuser structure. The filtration media is incorporated into the diffuser body, allowing simultaneous filtering of particulate matter and directional gas flow control without requiring separate filtration components, thus avoiding increased device complexity.
3Strength
If secondary welds are used to secure tube connections, then connection strength is improved, but manufacturing cost and energy consumption increase
Solution Approach 1:
The mechanical welding process is replaced with a friction-based engagement system. The second tube is inserted into the first tube and secured through friction engagement and geometric interlocking features, eliminating the need for secondary welds while maintaining connection strength. This substitution simplifies manufacturing by removing the welding step and associated energy consumption.
4Manufacturing precision
If tube positions are not fixed, then assembly is easier, but outlet positioning precision deteriorates
Solution Approach 1:
The engagement structure utilizes asymmetric geometric features including a beveled surface on the first tube and a corresponding notch on the second tube. This asymmetric design creates a unique insertion orientation that automatically positions the outlets with high precision while guiding the assembly process, eliminating the need for complex positioning mechanisms.
Data Source
AI summary
A diffuser includes a first tube and a second tube. The first tube includes a key and defines a first opening. The second tube is inserted through the first opening. The second tube defines a notch. The key is inserted into the notch.