Safety Belt Deflection Member Dynamic Positioning
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Solution Overview
Problem
Existing three-point safety belt devices often lack optimal comfort and safety due to inadequate belt path adaptation, particularly for varying body sizes and sudden deceleration scenarios, where the belt may slip off the shoulder or not provide sufficient restraint.
Innovation Solution
A multipoint safety belt device with a deflection member that transitions from a comfort position to an emergency position upon increased tensile loading, using a sickle-shaped through-passage to guide the belt portion over the shoulder and torso, ensuring optimal positioning and reduced slipping risk during collisions or sudden deceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the deflection member maintains a fixed comfort position for normal driving conditions, then occupant comfort is improved, but the belt may slip off the shoulder during sudden deceleration or collision
Solution Approach 1:
The deflection member is designed to dynamically change its position based on loading conditions. During normal driving, it maintains a comfort position that allows natural movement. During sudden deceleration or collision, the increased tensile loading automatically displaces the deflection member inward, preventing belt slippage while maintaining comfort during normal operation
2Reliability
If the deflection member is positioned to prevent belt slippage during collision, then belt retention is improved, but occupant comfort deteriorates due to restricted movement
Solution Approach 1:
The system dynamically adjusts the deflection member position based on real-time loading conditions. The comfort position is maintained during normal driving to allow natural movement, while automatically transitioning to the inward displacement position during collision to ensure retention, thus providing both comfort and safety at different times
3Adaptability or versatility
If a height adjustment mechanism is added to the deflection member, then adaptability to different body sizes is improved, but device complexity increases
Solution Approach 1:
The deflection member automatically adapts its position based on the tensile loading applied to the belt. During normal conditions, it maintains a standard position, while during sudden deceleration, the increased loading automatically displaces it inward to prevent slippage, eliminating the need for manual height adjustment mechanisms
Solution Approach 2:
The system changes the positional parameter of the deflection member dynamically in response to loading conditions. The position is not fixed but varies based on the tensile force applied, allowing adaptation to different body sizes and collision scenarios without adding mechanical adjustment components
Data Source
AI summary
A motor vehicle comprises a three-point safety belt device to a motor vehicle seat, wherein the safety belt device comprises a belt, a belt magazine, a belt buckle for releasably securing the belt and a deflection member. The deflection member is provided for guiding the belt emerging from the belt magazine and for deflecting the belt and forming a belt portion of the belt, wherein the belt portion is guided over a shoulder and a chest of a secured motor vehicle occupant seated on the motor vehicle seat. The deflection member is designed such that in the state of the motor vehicle occupant secured by the belt, when the belt portion is subjected to an increased tensile loading, the belt portion performs a displacement from a comfort position into an emergency position in the direction of the motor vehicle interior.