Vehicle Window Flexible Sheet for FMVSS 226 Compliance
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Solution Overview
Problem
Current vehicle window structures fail to meet the performance standards of FMVSS 226, which aims to prevent object ejection during impact events, as they lack effective countermeasures to retain glass fragments and absorb impact energy.
Innovation Solution
A vehicle window structure incorporating a flexible sheet material fixed to the exterior surface of the window glass and coupled to the vehicle body structure, with a main section covering the glass and an attachment section extending over the peripheral edge, using a sealant/adhesive material to ensure secure attachment and energy absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional window glass is used without additional protective measures, then the window structure is simple and easy to manufacture, but it fails to meet FMVSS 226 performance standards for preventing object ejection during impact events
Solution Approach 1:
A flexible sheet material is applied to the exterior surface of the window glass. This thin film captures and retains glass fragments during impact events, preventing object ejection while maintaining a relatively simple window structure that meets FMVSS 226 performance standards
Solution Approach 2:
The window structure combines multiple materials including window glass, flexible sheet material, and adhesive material to create a composite system. This composite approach provides both the glass's optical properties and the flexible material's fragment retention capability, achieving FMVSS 226 compliance without excessive complexity
2Reliability
If flexible sheet material is applied to cover the exterior surface of window glass, then glass fragment retention is improved, but the attachment and securing process becomes more complex
Solution Approach 1:
An adhesive material serves as an intermediary between the flexible sheet material and the window glass. This adhesive layer simplifies the attachment process by providing a reliable bonding interface, ensuring the flexible material remains securely positioned on the glass surface during installation and impact events
Solution Approach 2:
The flexible sheet material is pre-cut to match the dimensions and shape of the window glass before application. This preliminary preparation simplifies the manufacturing and installation process by eliminating the need for on-site cutting or adjustment, making the attachment process more efficient
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 flexible sheet material effectively retains window glass fragments, absorbs impact energy, and prevents object ejection by being securely attached to the vehicle body structure, meeting the performance requirements of FMVSS 226.
Implementation Method 1
The adhesive material is applied to the window glass and the flexible sheet material is attached to the adhesive material
Implementation Method 2
absorbs impact energy
Data Source
AI summary
A vehicle window structure includes a vehicle body structure, a window glass and a flexible sheet material. The vehicle body structure defines a window opening with a window supporting portion extending around a periphery of the window opening. The window glass has an interior surface, an exterior surface and an outer peripheral edge extending around the window glass between the interior surface and the exterior surface. The window glass is non-movably fixed to the window supporting portion. The flexible sheet material has a main section and an attachment section. The main section of the flexible sheet material covers the exterior surface of the window glass. The attachment section extends over at least a portion of the outer peripheral edge of the window glass and away from the exterior surface of the window glass. The attachment section is fixedly coupled to the vehicle body structure.