Webbing Take-Up Device Sensor Positioning via Nested Tube
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Solution Overview
Problem
Existing webbing take-up devices for vehicle seat belts face challenges in preventing an increase in size due to the need for adjustable anchoring positions of coupling members operating acceleration sensors, which complicates the design and increases space requirements.
Innovation Solution
A webbing take-up device with a tilt detection section and a coupling member that allows the acceleration sensor housing to maintain its position relative to the take-up device main body during seat tilting, using a tube and retention section to adjust the sensor's initial position without altering the anchoring position of the coupling member, thereby reducing the size requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the position of the join between pinion meshing side and cable other end retaining side is shifted to adjust the initial rotation position of the pinion and the initial position of the sensor case, then the adjustability of the sensor position is improved, but the rack dimension in the length direction increases
Solution Approach 1:
The coupling member is inserted through the tube, with the tube serving as a guide and constraint structure. The coupling member can move within the tube's length direction, allowing position adjustment while the tube confines the movement space. This nested configuration enables the sensor housing to be positioned at different initial angles without increasing the overall rack length, as the adjustment occurs within the existing tube dimensions.
Solution Approach 2:
The tube acts as an intermediary structure between the take-up device main body and the support body. It provides a guided path for the coupling member, allowing the sensor housing to move and adjust its position while constraining the movement to a specific trajectory. This intermediary structure enables position adjustment without requiring additional space in the rack's length direction.
2Adaptability or versatility
If the coupling member is made movable along the length direction within the tube, then the initial position of the sensor housing can be adjusted, but the structure becomes more complex
Solution Approach 1:
The coupling member is designed to be movable along the length direction of the tube, transforming the static sensor positioning system into a dynamic one. This allows the sensor housing to be adjusted to different initial positions by moving the coupling member within the tube, providing adaptability without requiring multiple discrete components or complex adjustment mechanisms.
Solution Approach 2:
The initial position of the sensor housing is adjusted by changing the position parameter of the coupling member along the tube's length direction. This simple parameter change (position of coupling member) enables flexible sensor positioning while maintaining a relatively simple structural configuration, avoiding the need for complex adjustment mechanisms.
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 prevents an increase in size of the anchoring member for the coupling member, allowing for efficient operation of the acceleration sensor during seat tilting, maintaining its functionality without the need for additional space, and enabling adjustment of the sensor's initial position without changing the anchoring position.
Implementation Method 1
an inertia mass body that actuates the locking mechanism by inertia moving
Data Source
AI summary
A length direction base end side of a wire passes through a retaining spring mounting hole formed in a case, and is anchored to an anchor tag that is indirectly retained by a pulley. A spring is provided in the retaining spring mounting hole, and a base end of a tube is retained to the spring through a metal cylinder body. A spring-side step portion of the spring is pressed contact to a mounting portion-side step portion of the retaining spring mounting hole so the spring is retained. When the tube is pulled towards an opening side of the retaining spring mounting hole, the spring moves and the spring-side step portion makes press contact with, and is once again retained, by a different step of the mounting portion-side step portion.