Anchor Pre-tensioner Two-Wire Webbing Restraint
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Solution Overview
Problem
The 'submarine phenomenon' occurs during vehicle collisions, where the seat belt webbing gets caught in the passenger's belly due to inadequate tension and positioning, leading to increased injury risk, particularly for dummies with smaller pelvises and lower bellies, as existing solutions face challenges in modifying vehicle structures and components without compromising ride comfort or usability.
Innovation Solution
An anchor pre-tensioner system utilizing a first wire and a second wire connected to the seat belt, with a driving cylinder and gas generator, which pulls the webbing downward and obliquely to increase the intersection angle, preventing the webbing from being caught in the passenger's belly by generating a restriction force during collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the anchor pre-tensioner pulls the webbing upward to remove slack, then the initial restraint ability is improved, but the webbing gets caught in the belly during collision
Solution Approach 1:
The invention changes the single upward pulling direction to a two-dimensional force system by introducing a second wire that pulls in a different direction. The first wire pulls upward to remove slack while the second wire pulls at an angle to prevent the webbing from moving excessively upward and getting caught in the belly, thus resolving the contradiction through dimensional change in force application.
Solution Approach 2:
The invention changes the parameter of force direction by introducing a second wire with a different pulling angle. The first wire provides upward tension while the second wire provides tension at an angled direction, creating a combined force vector that achieves both slack removal and prevention of webbing entrapment in the belly.
2Object-affected harmful factors
If the intersection angle of the anchor pre-tensioner is increased to prevent webbing entrapment, then the webbing is prevented from being caught in the belly, but the device complexity increases
Solution Approach 1:
The invention merges two wire pulling mechanisms into a single anchor pre-tensioner device. The first wire and second wire are integrated with the driving cylinder and gas generator to form a unified system that achieves both slack removal and webbing position control through coordinated action of the two wires, thereby preventing entrapment without excessive complexity.
Solution Approach 2:
The anchor pre-tensioner is designed with multi-functionality by incorporating both the first wire for slack removal and the second wire for webbing position control. This single device performs multiple functions: removing webbing slack, controlling webbing trajectory, and preventing belly entrapment, thereby reducing the need for separate devices and minimizing overall system complexity.
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 reduces the force applied to the passenger's belly, stabilizes upper body mobility, and delays the webbing's entrapment, thereby reducing injury risk and improving collision performance without requiring significant structural modifications.
Implementation Method 1
a gas generator for generating gas pressure to move the piston forward
Implementation Method 2
the gas generator is configured to move the piston with explosive force of gunpowder exploded by a signal
Data Source
AI summary
An anchor pre-tensioner for seat belt of vehicle improves phenomenon in which a webbing of seat belt is caught in belly of passengers during collision by the vehicle. The anchor pre-tensioner may include: first second wires connected to a lower end of the webbing respectively; a driving cylinder having a piston coupled to ends of the first and second wires; a gas generator supplying a gas pressure for the forward movement of the piston; a first roller supporting the first wire to move in the direction oblique against the bottom of the vehicle during the forward movement of the piston; and a second roller supporting the second wire to move downward when the piston moves forward; wherein the forward movement of the piston pulls the webbing of the seat belt in the direction where the first wire moves and at the same time in the direction perpendicular thereto.