Stamped Seatbelt Webbing Guide to Prevent D-Ring Dumping
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Solution Overview
Problem
The existing D-ring guides in three-point seatbelt systems experience 'dumping' of seatbelt webbing, leading to uneven loading and potential failure under high tension during crashes, as the webbing tends to bunch at one end, concentrating the load and increasing the risk of structural damage.
Innovation Solution
A one-piece stamped metal guide with a guiding surface featuring guide elements, such as grooves or studs, positioned outside the mounting plane, which helps prevent dumping by distributing the load evenly and maintaining the webbing's position through frictional engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the seatbelt webbing passes through a conventional D-ring, then the webbing can slide freely, but the webbing tends to dump and bunch at one end of the webbing slot, concentrating the load
Solution Approach 1:
The guiding surface is positioned outside the mounting plane, creating a localized geometric feature that modifies webbing behavior only where needed. This asymmetric positioning provides anti-dumping functionality without restricting overall webbing movement, resolving the contradiction between sliding freedom and load distribution uniformity
Solution Approach 2:
The guiding surface extends in a direction other than the primary webbing movement direction by positioning it outside the mounting plane. This dimensional extension creates frictional engagement that prevents dumping while maintaining webbing sliding capability along the slot
2Reliability
If the guiding surface is positioned outside the mounting plane, then the webbing is prevented from dumping, but the guide structure becomes more complex
Solution Approach 1:
The guiding portion is integrated with the mounting portion as a single stamped metal component. This merging of functions allows the guiding surface to be positioned outside the mounting plane without requiring separate anti-dumping devices, thus preventing webbing dumping while minimizing structural complexity
Solution Approach 2:
The single stamped metal guide performs multiple functions: mounting the webbing slot, providing guiding surfaces for webbing movement, and preventing dumping through the positioned guiding surface. This multi-functionality reduces the need for additional components despite the enhanced positioning requirements
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 solution effectively prevents seatbelt webbing from bunching, ensuring even load distribution across the guide, enhancing the structural integrity of the D-ring during high-tension events like crashes and maintaining the webbing's position within the webbing slot.
Implementation Method 1
A portion of the guiding surface including the guide element is positioned outside the mounting plane... helps to prevent dumping by distributing the load evenly and maintaining the webbing's position through frictional engagement
Data Source
AI summary
A one-piece stamped metal guide (128) for seatbelt webbing (112) in a vehicle (108) includes a mounting portion (242) for mounting the guide in the vehicle. The mounting portion (242) defines a mounting plane (352). A guiding portion (244) includes a guiding surface (256) having at least one guide element (258) stamped in the metal forming the guiding portion. A portion of the guiding surface (256) including the at least one guide element (258) is positioned outside the mounting plane (352). Laterally spaced side portions (246) connect the guiding portion (244) with the mounting portion (242). The mounting portion (242), guiding portion (244), and side portions (246) define a webbing slot (248) for receiving the seatbelt webbing (112) for sliding movement over the guiding surface (256).