Grooved Vehicle Safety Belt Deflection Element
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Solution Overview
Problem
Existing deflection elements for safety belt systems in vehicles, produced by cold deformation, face issues with safety belt slippage during dynamic stress, leading to uneven retention force and potential damage due to friction, especially when the belt slips into the corners of the belt eye.
Innovation Solution
A method involving punching and cold deformation of a metal body with grooves on the belt running surface, forming a diamond pattern of intersecting grooves that extend in the pulling direction, combined with a slide coating to reduce friction, ensures reliable safety belt guidance and stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the belt eye has a rounded cross-section to guide the safety belt, then the belt guidance is improved, but the belt may slip into the corner during dynamic stress
Solution Approach 1:
The patent applies grooves with different cross-sectional profiles at different locations on the belt running surface. The grooves have a rounded cross-section in the pulling direction to guide the belt smoothly, while having flattened sides perpendicular to the pulling direction to prevent lateral slippage into corners. This local variation in geometry resolves the contradiction between smooth guidance and stability.
Solution Approach 2:
The belt running surface is segmented into multiple grooves that divide the surface into distinct zones. These grooves create individual guidance channels that constrain the belt laterally while maintaining smooth rounded profiles in the pulling direction. The segmentation allows simultaneous achievement of smooth belt passage and prevention of corner slippage.
2Ease of operation
If the safety belt is guided through a rounded belt running surface, then the belt moves smoothly, but friction increases when the belt slips into corners
Solution Approach 1:
The grooves are designed with rounded profiles in the pulling direction to minimize friction during normal belt movement, while having flattened lateral sides to prevent the belt from contacting the corner regions of the belt eye. This local geometric differentiation ensures smooth movement without the harmful friction that occurs when belts slip into corners.
3Reliability
If grooves are added to the belt running surface to prevent slippage, then belt stability is improved, but the manufacturing complexity increases
Solution Approach 1:
The grooves are formed in the metal blank before the cold deformation process that creates the rounded belt running surface. By preliminarily embossing the groove patterns into the flat blank, the complex three-dimensional groove structures are created as integral features of the deformation process rather than requiring separate machining operations, thus reducing manufacturing complexity.
Solution Approach 2:
The patent combines the groove formation with the cold deformation process in a single manufacturing step. The embossing tool creates the groove patterns in the metal blank, and the subsequent punching and cold deformation simultaneously form both the grooves and the rounded belt running surface, merging multiple functions into one integrated process.
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 grooved design and slide coating enhance the stability and guidance of the safety belt during crashes, preventing slippage and ensuring uniform retention force, thereby improving the overall performance and reducing the risk of damage to the safety belt system.
Implementation Method 1
The grooves only have to be made in the segment of the metal blank from which the belt running surface is formed by cold deformation. In this connection, grooves are understood to be narrow depressions in the belt running surface, into which the belt presses slightly in the case of stress that occurs in a crash situation.
Implementation Method 2
Subsequently, a slide coating that reduces the friction resistance on the belt running surface can be applied to the metal body.
Data Source
AI summary
A method for producing a deflection element for safety belt systems in vehicles, includes making grooves in a flat metal blank, using an embossing tool, and producing a metal body from the flat metal blank, by means of punching and cold deformation. The metal body has an attachment opening and a belt eye having a belt surface that is rounded in cross-section, to guide a safety belt, whereby the belt running surface contains the grooves previously formed in the flat metal blank.