Seatbelt Webbing Take-Up Stopper for Stable Tooth Engagement
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Solution Overview
Problem
Existing webbing take-up devices face challenges in stabilizing the movement of the stopper towards the section where the teeth of the rotating member bite into or pierce the moving member.
Innovation Solution
The webbing take-up device incorporates a stopper that is pressed by a portion of the moving member where the biting into or piercing of the rotating member has been disengaged, and is engaged by the teeth of the rotating member, thereby suppressing the rotation of the rotating member and allowing the stopper to move stably towards the desired section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stopper is pressed by the moving member to move toward the section where the teeth bite into or pierce the moving member, then the rotation of the rotating member is suppressed, but the stopper movement stability is insufficient
Solution Approach 1:
A guide groove is introduced as an intermediary structure between the stopper and the moving member. The guide groove guides the stopper along a predetermined path, ensuring stable and smooth movement toward the section where the teeth bite into or pierce the moving member, while eliminating uneven movement and improving overall reliability
Solution Approach 2:
The guide groove changes the movement parameters of the stopper by providing a constrained path. This structural modification transforms the stopper's movement from unstable and irregular to stable and controlled, allowing reliable suppression of rotating member rotation
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
This configuration enables the stopper to move stably and effectively suppress the rotation of the rotating member, ensuring reliable operation of the webbing take-up device.
Implementation Method 1
a fluid supplier provided at an axial direction base end side of the cylinder and supplying a fluid inside the cylinder in a vehicle emergency; a moving member that is provided inside the cylinder, that is moved toward the axial direction leading end side of the cylinder due to pressure of the fluid
Data Source
AI summary
A webbing take-up device including: a spool; a rotating member configured such that the spool is rotated in a take-up direction by the rotating member being rotated toward one side; a cylinder open at an axial direction leading end side; a fluid supplier provided at an axial direction base end side of the cylinder and supplying a fluid inside the cylinder in a vehicle emergency; a moving member provided inside the cylinder, moved toward the axial direction leading end side of the cylinder due to pressure of the fluid, and rotating the rotating member toward the one side by being moved in a state in which a tooth of the rotating member has bitten into or pierced the moving member; and a stopper provided further toward a movement direction side of the moving member than a section where the tooth of the rotating member has bitten into or pierced the moving member, the stopper being pressed by a portion of the moving member where the biting into or piercing of the rotating member has been disengaged, the stopper being engaged by teeth of the rotating member, and the stopper suppresses rotation of the rotating member toward the one side by the stopper being moved toward the section where teeth of the rotating member bite into or pierce the moving member.