Collar Member Segmentation for Inflator Gas Flow
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Solution Overview
Problem
In air bag devices, the deflector's collar member can block gas injection holes, reducing the velocity of inflation and expansion of the bag body, and may cause misalignment or instability in gas injection due to uneven gas distribution.
Innovation Solution
A collar member with strategically positioned abutting parts, notch parts, and curved ribs is designed to face the gas injection holes across a space, preventing blockage and ensuring even gas injection while stabilizing the inflator main body by balancing reaction forces and enhancing structural strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the collar member is fixed to the inflator main body to prevent misalignment, then the position stability is improved, but the gas injection holes may be blocked causing reduced gas injection velocity
Solution Approach 1:
The collar member is divided into multiple segments with abutting parts positioned at specific locations. These segmented structures allow the collar to maintain positional stability while creating gaps between segments that prevent complete blockage of gas injection holes, enabling gas to flow through the collar structure.
Solution Approach 2:
The collar member features localized abutting parts at specific positions rather than a continuous structure. This local quality approach allows certain areas to provide stability through abutting surfaces while other areas maintain openness for gas injection, resolving the contradiction between stability and gas flow velocity.
2Stability of the object's composition
If the collar member abuts the inflator main body to prevent misalignment, then the position stability is improved, but uneven gas distribution may occur causing thrust force and instability
Solution Approach 1:
The abutting parts are strategically positioned asymmetrically on the collar member to counterbalance each other. This asymmetric arrangement ensures that when the collar abuts the inflator main body, the reaction forces from gas injection are evenly distributed, preventing net thrust forces that would cause instability.
Solution Approach 2:
The abutting parts function as counterbalancing elements that offset each other's effects. By positioning abutting parts at specific locations, the design creates a balanced force distribution system where reaction forces from gas injection on one side are compensated by corresponding forces on the opposite side, eliminating net thrust.
3Productivity
If the collar member is positioned to face gas injection holes, then gas injection smoothness is improved, but structural strength may be reduced due to material removal
Solution Approach 1:
The collar member incorporates curved surfaces and rounded features instead of sharp edges or flat surfaces. This curvature design maintains structural integrity by distributing stress more evenly throughout the material, compensating for the strength reduction caused by material removal for gas injection holes.
Solution Approach 2:
The collar member utilizes composite material construction or material property optimization to maintain strength despite material removal. The design compensates for reduced cross-sectional area by selecting materials or configurations that provide equivalent or enhanced mechanical properties.
Data Source
AI summary
An inflator (3) includes an inflator main body (10) which is has a tubular shape and has a plurality of gas injection holes (11) on a circumferential surface, and a steel-made collar member (20) which has a gas jet reception part (28) that is disposed so as to face a gas injection holes formation area (R) of the inflator main body (10) across a space.