Wire Harness Flat-Shaped Restraint for Roof Lining Adhesion
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Solution Overview
Problem
Existing wire harness configurations for automobile roofs face challenges in securing a sufficient adhesion area and fixing strength, especially at bend and branch portions, due to the circular cross-section of wires and limited versatility, leading to reduced workability and increased vulnerability to vibration.
Innovation Solution
A wiring structure featuring belt-shaped tapes with adhesive surfaces that restrain electric wires in a flat shape at critical portions, allowing for secure fixation to the roof lining without additional components, enhancing adhesion area and workability while maintaining flexibility for alignment adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the wire harness is fixed using adhesive tape at multiple fixing points, then the fixing strength is improved, but the work becomes troublesome and time-consuming
Solution Approach 1:
The adhesive member is divided into multiple adhesive portions positioned at different locations (first, second, and third adhesive portions) that can simultaneously adhere to different parts of the wire harness (trunk line and branch lines), replacing the need for multiple separate fixing operations with a single integrated adhesive component
Solution Approach 2:
The adhesive member is prepared in advance with adhesive portions positioned at specific locations before the wire harness is installed, allowing the wire harness to be directly adhered without requiring multiple sequential fixing operations during assembly
2Volume of moving object
If the wire harness is made thin with many branch line portions, then the overall size is reduced, but it becomes difficult to find reference points and assemble to the roof lining
Solution Approach 1:
The adhesive member includes a non-adhesive portion that serves as a visual reference marker, making it easy to identify and align during assembly despite the wire harness being thin with multiple branch lines
Solution Approach 2:
The adhesive member acts as an intermediary reference tool that bridges the gap between the thin wire harness and the roof lining, providing visual and physical guidance for accurate positioning and assembly
3Stability of the object's composition
If the wire harness is hard, then the structure is stable, but it is difficult to make the wire harness follow the roof lining and requires time-consuming habituation
Solution Approach 1:
The adhesive member is designed with specific physical parameters (flexibility, adhesion strength, thickness) that allow it to conform to the roof lining's shape while maintaining the wire harness's stability, eliminating the need for time-consuming wire harness deformation
4Manufacturing precision
If the branch portion is taped more than necessary to correct directionality, then the direction alignment is improved, but the portions become thicker and harder, reducing adhesive area and wiring performance
Solution Approach 1:
The adhesive member has different functional regions: adhesive portions for bonding and a non-adhesive portion for reference, with each region optimized for its specific function, allowing precise direction alignment without excessive taping that would reduce adhesive area
Solution Approach 2:
Instead of applying adhesive or taping to the entire wire harness including branch portions, the adhesive member applies adhesive only at specific portions where needed, leaving other areas (including branch portions) untaped to maintain their original thickness and adhesive properties
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 ensures strong and stable fixation of the wire harness, improves wiring workability, and reduces the impact of vehicle vibrations by maintaining the electric wires in a flat shape, thus increasing the overall fixing strength and simplifying the wiring process.
Implementation Method 1
a wire harness configured to be wired by being fixed to the adhesive member
Data Source
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AI summary
A wiring structure of a wire harness in which a wire harness (W) is fixed to an adhesive member (2) laid on a surface of a roof lining (1) of an automobile is disclosed, wherein on at least a part of a bent portion (W2, W4), the plurality of electric wires (Wa) are sandwiched between two belt-shaped tapes (11, 12) in which both side edges (11a, 12a) are fixed to each other, are spread side by side in the width direction, and are attached to an adhesive surface provided on an inner surface of at least one of the two tapes (11, 12), thereby providing a restraint portion (M) in which the bundle of the electric wires (Wa) is held in a flat shape, a portion excluding the restraint portion (M) is a non-restraint portion in which the plurality of electric wires (Wa) are unrestrained, and an outer surface of one of the two tapes (11, 12) in the restraint portion (M) is attached to the adhesive member.