Curtain Airbag Patch Cloth for Packability and Cut Resistance
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Solution Overview
Problem
Existing curtain airbags face challenges with packability and cut resistance during deployment, leading to reduced internal pressure retention and shock absorption performance.
Innovation Solution
A woven airbag patch cloth with specific dynamic tear properties, warp and weft cover factors, and fineness ranges is designed for attachment to the airbag body cloth, enhancing packability and cut resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a protector is attached to the outside of the curtain airbag cushion to prevent glass fragments from contacting the cushion, then cut resistance is improved, but packability is reduced
Solution Approach 1:
The invention merges the body cloth and protector into a single integrated airbag cushion structure, where the protector is attached to the inner surface of the body cloth to form a unified component. This eliminates the need for separate attachment steps and reduces overall volume compared to having separate protector and body cloth layers.
Solution Approach 2:
The protector is nested within the airbag cushion structure by attaching it to the inner surface of the body cloth. This nested arrangement allows the protector to be contained within the overall cushion envelope, minimizing additional volume while maintaining protective function.
2Speed
If the airbag is deployed at high speed in one direction, then deployment speed is improved, but the cushion surface interferes with side glass causing unidirectional tear mode cuts
Solution Approach 1:
The protector is attached to the airbag cushion before deployment to preemptively prevent glass fragments from contacting and cutting the body cloth during high-speed deployment. This preliminary protective measure counteracts the harmful effect of high-speed interference with side glass.
Solution Approach 2:
The protector acts as an intermediary layer between the body cloth and external glass fragments. During high-speed deployment, this intermediate layer absorbs the impact and prevents direct contact between the body cloth and cutting edges of glass, maintaining cut resistance at high speeds.
3Strength
If a covering or film of polyurethane elastomer is arranged on the surface of the airbag body cloth to improve abrasion and puncture resistance, then surface strength is improved, but the hardness of the cushion body cloth increases reducing packability and deployment speed
Solution Approach 1:
Instead of uniformly covering the entire airbag surface with hard polyurethane elastomer, the invention attaches a fabric protector with specific weave structure and material properties to localized areas. This local quality approach provides necessary protection while maintaining overall cushion flexibility and softness for rapid deployment.
Solution Approach 2:
The invention changes the material parameters of the protector from rigid polyurethane elastomer coatings to flexible fabric materials with appropriate tensile strength, tear resistance, and mass per unit area. This parameter change maintains strength while preserving deployment speed and packability.
4Strength
If high-strength fibers are used to increase strength against penetration, then cut resistance is improved, but the damage mode due to pushing blade is not addressed and packability may be reduced
Solution Approach 1:
The invention uses composite fabric structures combining different fiber types and weave patterns to achieve both penetration resistance and dynamic tear resistance. The body cloth and protector use complementary material properties to address multiple damage modes simultaneously without excessive weight or volume.
Solution Approach 2:
The fabric structure is designed with dynamic properties including controlled tensile elongation and tear propagation characteristics that allow the material to respond differently to various types of forces. This dynamic response enables resistance to both static penetration and dynamic blade cutting while maintaining packability.
Data Source
AI summary
The present disclosure provides an airbag patch cloth that has superior packability and cutting resistance upon deployment of the airbag, and which is particularly suitable for a curtain airbag. The airbag patch cloth is a woven fabric which satisfies the following equations: Px=E/(Tx×Fx)×1000, Py=E/(Ty×Fy)×1000, wherein E indicates the kinetic energy (J) of a block and a blade. In the equations, Tx indicates the average value (mm) of a torn length in the warp direction, Fx indicates the linear density (dtex) of the warp constituting the fabric, Ty indicates the average value (mm) of a torn length in the weft direction, and Fy indicates the linear density (dtex) of the weft constituting the fabric. At least one of dynamic tear characteristics Px and Py is greater than or equal to 0.8.