Webbing Take-up Device Multi-Directional Engagement Torque
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Solution Overview
Problem
Existing webbing take-up devices face challenges in increasing torque without enlarging the rotor size, which is crucial for efficient webbing deployment in emergency situations.
Innovation Solution
The design incorporates a rotor with opposing portions and engaging teeth that allow the moving member to engage with both axial and diametric direction teeth, increasing the number of engagement locations and torque transmission efficiency while maintaining a compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the rotor size is increased to provide engaging teeth at the rotation center side, then the torque with which the moving member rotates the rotor is increased, but the size of the rotor increases
Solution Approach 1:
The patent transitions from a single-dimension engagement (rotation center side only) to a multi-dimensional engagement by providing engaging teeth at both the rotation center side and the diametric direction outer side of the rotor. This allows the moving member to engage at multiple locations simultaneously, increasing torque without increasing rotor size.
Solution Approach 2:
The rotor is segmented into multiple engagement zones: engaging teeth at the rotation center side and engaging teeth at the diametric direction outer side. This segmentation allows the moving member to distribute its engagement across multiple points, achieving higher torque output without proportionally increasing the rotor's overall size.
2Device complexity
If the moving member engages with engaging teeth at the rotation center side, then the structure is simple, but the torque transmission efficiency is limited
Solution Approach 1:
The patent merges two engagement mechanisms into a single integrated rotor structure: engaging teeth at the rotation center side and engaging teeth at the diametric direction outer side. This allows the moving member to simultaneously engage both sets of teeth, combining their torque transmission effects while maintaining a unified rotor structure.
Data Source
AI summary
A webbing take-up device is provided with a spool on which a webbing to be applied to a vehicle occupant is taken up, due to the spool rotating in a take-up direction. The webbing take-up device is also provided with a lock base and a connecting member that are integrally rotatable with the spool. The lock base and connecting member are provided with a lock base-side flange portion and a connecting member-side flange portion, which are disposed opposite to one another in a rotation axis direction of the spool, and with lock base-side second engaging teeth and connecting member-side second engaging teeth.