Webbing Take-Up Guide Pipe Curvature to Reduce Sliding Loss
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Solution Overview
Problem
Existing webbing take-up devices experience significant sliding loss due to the elongated resin component passing through corners in the pipe, leading to inefficiencies and increased wear.
Innovation Solution
The design incorporates a tubular guide member with strategically bent corner portions, where the first and second corner portions are on the same plane and the third corner portion deviates, with larger radii of curvature, to minimize deceleration and sliding resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the elongated resin component passes through corner portions inside the pipe, then the moving member can be guided through the guide member, but sliding loss occurs due to bending deformation at the corner portions
Solution Approach 1:
The patent applies local quality by differentiating the radius of curvature among the three corner portions. Specifically, the first corner portion has a smaller radius of curvature, the second corner portion has a medium radius, and the third corner portion has the largest radius. This localized variation in geometric properties optimizes the balance between guiding the moving member through the pipe and minimizing sliding loss at each corner portion.
Solution Approach 2:
The patent changes the geometric parameter (radius of curvature) of the corner portions to reduce sliding loss. By setting the radius of curvature of the third corner portion larger than that of the first corner portion, and the radius of the second corner portion larger than or equal to the first, the patent optimizes the flow of the elongated resin component through the guide member, reducing bending deformation and associated energy loss.
2Length of moving object
If the pipe is bent in a substantially U shape with sufficient length, then the guide member can accommodate the moving member, but sliding loss increases at the corner portions
Solution Approach 1:
The patent applies local quality by making the third corner portion have a larger radius of curvature compared to the first corner portion. This localized geometric optimization reduces sliding loss at the third corner portion while maintaining the overall U-shape configuration and sufficient length of the guide member for accommodating the moving member.
Solution Approach 2:
The patent utilizes curvature by varying the radius of curvature at different corner portions. The third corner portion has a larger radius of curvature than the first corner portion, creating a smoother transition that reduces bending deformation and sliding loss. The second corner portion has a radius of curvature larger than or equal to the first, further optimizing the curved path for the elongated resin component.
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 reduces sliding loss and wear by minimizing deceleration and sliding resistance, enhancing the efficiency and durability of the webbing take-up process.
Implementation Method 1
the elongated resin component passes through a corner portion inside the pipe... sliding loss occurs because the elongated resin component passes through a corner portion inside the pipe
Data Source
AI summary
In a pipe, a first corner portion, a second corner portion, and a third corner portion are formed sequentially from a guide direction upstream stream as a result of an axial direction intermediate portion of the pipe being bent in three places. The first corner portion and the second corner portion are bent in a substantially identical plane, and the third corner portion is bent in a direction deviating from the substantially identical plane. The radius of curvature of the third corner portion is set larger than the radius of curvature of the first corner portion.