Split Collar Structure for Wide-Tolerance Wire Harness Fastening
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Solution Overview
Problem
Existing fastening structures for carbon fiber reinforced resin materials have narrow tolerance ranges and design limitations due to the cylindrical shape of collars and bolts, which restrict the absorption of tolerances and lead to potential deformation and loosening issues.
Innovation Solution
A collar design comprising a first and second member with cylindrical portions and flange portions, where the outer diameters of these portions are smaller than the through hole, allowing for a gap that absorbs radial tolerance and disperses surface pressure, enabling movement in a 360-degree circumference direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a cylindrical collar with narrow tolerance is used for fastening, then the fastening structure is simple, but the tolerance range is limited and design flexibility is reduced
Solution Approach 1:
The collar is divided into a first member and a second member that can be independently inserted into the through hole. This segmentation allows each member to independently absorb tolerance in different directions, significantly increasing the overall tolerance range while maintaining a relatively simple individual component structure
Solution Approach 2:
The invention transitions from a single-cylinder structure to a multi-member structure where the first and second members are positioned at different locations. This dimensional arrangement enables tolerance absorption in multiple spatial directions simultaneously, expanding design flexibility without substantially increasing individual component complexity
2Strength
If a tight-fitting cylindrical collar is used, then the fastening is secure, but surface pressure is concentrated and deformation may occur
Solution Approach 1:
By dividing the collar into multiple members distributed at different positions, the contact pressure with the through hole is segmented. This distribution prevents concentration of surface pressure at a single location, reducing the risk of deformation while maintaining overall fastening security through the combined effect of multiple contact points
Solution Approach 2:
Each collar member provides localized fastening security at its specific position, while the overall structure achieves pressure distribution through the spatial arrangement of multiple members. This local quality approach ensures secure fastening without sacrificing pressure distribution
3Reliability
If adhesive is used to attach the collar, then corrosion is suppressed, but the fastening structure becomes more complex and component management becomes difficult
Solution Approach 1:
The invention extracts and eliminates the adhesive component from the fastening structure. By using a mechanical insertion design where the first and second collar members are positioned within the through hole, the solution achieves corrosion resistance through the gap structure itself rather than relying on adhesive materials, thereby simplifying the overall fastening structure and component management
Data Source
AI summary
A collar includes a first member that includes a first flange portion having a plate-like shape and a first cylindrical portion, and a second member that includes a second flange portion having a plate-like shape and a second cylindrical portion, the second cylindrical portion being coupled to the first cylindrical portion. When the first cylindrical portion and the second cylindrical portion are inserted into a through hole of a mounting target member, outer diameters of the first cylindrical portion and the second cylindrical portion are smaller than a hole diameter of the through hole, and a gap is provided between outer circumferential surfaces of the first cylindrical portion and the second cylindrical portion and an inner circumferential surface of the through hole.