Inflatable Safety Belt Anchor Fitting Segmentation
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Solution Overview
Problem
Inflatable safety belts face challenges in designing optimal fastening and sealing of the gas generator connection, where failure of either component can affect the other's functionality, and the connection is often compromised between tensile force transmission and impermeability.
Innovation Solution
The ends of the belt webbing layers are connected to the anchor fitting in a way that the flow connection to the gas generator is free of tensile forces, allowing for separate functional components and optimal design for impermeability and load handling, with a U-shaped anchor fitting and swivel-mounted connections to ensure restraint functionality even if the gas generator fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gas generator and belt webbing are connected at the anchor fitting, then the safety belt can be fastened to the vehicle structure, but the flow connection is subjected to tensile forces which compromises sealing and requires complex design
Solution Approach 1:
The anchor fitting is divided into two separate functional components: a first anchor fitting for connecting belt webbing layers and a second anchor fitting for connecting the gas generator. This segmentation separates the tensile force transmission path from the gas flow connection, allowing each component to be optimized for its specific function without compromise.
Solution Approach 2:
The gas generator connection is extracted from the load-bearing anchor fitting structure. By providing a separate second anchor fitting specifically for the gas generator, the flow connection is removed from the path of tensile forces, enabling optimal sealing design independent of mechanical load requirements.
2Ease of manufacture
If the same anchor fitting is used for both fastening and gas generator connection, then structural simplicity is achieved, but optimal design for both tensile force transmission and sealing cannot be accomplished
Solution Approach 1:
The anchor fitting assembly is segmented into distinct functional units: a first anchor fitting optimized for mechanical fastening and a second anchor fitting optimized for gas generator connection. This segmentation allows each component to be manufactured and optimized independently for its specific function.
Solution Approach 2:
The base plate serves as a universal mounting structure that provides attachment points for both the first anchor fitting (belt webbing) and the second anchor fitting (gas generator). This multi-functional base plate integrates both functions while allowing independent optimization of each connection point.
3Volume of moving object
If the flow connection is integrated with the fastening structure, then the overall structure is compact, but the connection cannot be optimized solely for impermeability and flow guidance
Solution Approach 1:
The flow connection components (diffuser, gas lance) are segmented from the fastening structure and mounted on a separate second anchor fitting. This allows the flow connection to be designed and manufactured with high precision for optimal gas distribution, independent of the mechanical fastening requirements.
Solution Approach 2:
The second anchor fitting acts as an intermediary mounting structure that connects the gas generator and flow connection components to the base plate. This intermediary structure allows precise positioning of flow components while maintaining a compact overall assembly.
Data Source
AI summary
An inflatable safety belt has a belt webbing (3) with at least two belt webbing layers (3a, 3b) put on top of each other and forming a hollow space in between, a gas generator (12) having a flow connection to the hollow space, and an anchor fitting (6) for fastening the belt webbing (3) and the gas generator (12) to a motor vehicle. The ends of the belt webbing layers (3a, 3b) are connected to the anchor fitting (6) in such a way that the flow connection to the gas generator (12) is free of tensile forces.