Wire Harness Fixing Structure With Jig-Guiding Bent Contact Portion
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Solution Overview
Problem
Conventional fixing structures for wire harnesses to vehicle bodies face difficulties in easy detachment without damaging or breaking the components, and there is a challenge in maintaining dustproof and waterproof performance while minimizing size and ensuring elasticity.
Innovation Solution
The fixing member features a support column with elastic locking pieces and a dish-like contact portion that includes bent portions formed outside the connection points of the elastic locking pieces, allowing easy detachment with a jig and reducing the risk of damage, while maintaining dustproof and waterproof performance and minimizing size increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional engagement part with a dish-like contact portion is used to fix a wire harness to a vehicle body, then the fixing structure achieves strong adhesion and secure fixation, but it becomes difficult to insert a jig between the plate-shaped member and the dish-like contact portion for detachment, and the engagement part cannot be easily detached without risk of damage
Solution Approach 1:
The dish-like contact portion is segmented by introducing bent portions that divide the originally continuous structure into distinct regions. These bent portions create access points that allow a jig to be inserted between the plate-shaped member and the dish-like contact portion, enabling detachment while maintaining the overall fixation strength during normal use.
Solution Approach 2:
The bent portions act as intermediary elements that facilitate the insertion of a jig (mediator tool) between the plate-shaped member and the dish-like contact portion. This intermediary structure enables the detachment process without requiring direct force application that would damage the components, thus resolving the contradiction between strong adhesion and easy detachment.
2Ease of operation
If a jig is inserted between the plate-shaped member and the dish-like contact portion to detach the engagement part, then the engagement part can be removed, but there is a possibility of damaging or breaking the plate-shaped member and the dish-like contact portion
Solution Approach 1:
The bent portions are designed in advance to provide a cushioning effect during the detachment process. By creating these predetermined structural features, the design anticipates the detachment operation and provides a safe path for jig insertion that prevents concentration of stress on critical components, thereby preventing damage while enabling removal.
3Ease of operation
If the size of the dish-like contact portion is increased to facilitate jig insertion and detachment, then the fixing member can be easily removed and reused, but it becomes difficult to adopt from the viewpoint of cost and the freedom of placement
Solution Approach 1:
Instead of uniformly increasing the size of the dish-like contact portion, the bent portions are introduced as localized structural features at specific locations. This local modification provides the necessary jig access points without significantly increasing the overall volume, thus maintaining cost-effectiveness and freedom of placement while enabling easy detachment.
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 enables easy detachment of the fixing member without damage, supports reusability, and maintains the desired performance and elasticity, contributing to sustainable development goals by facilitating the reuse of wire harnesses.
Implementation Method 1
the elastic locking pieces pass through the through hole with inward elastic deformation approaching the support column, and when a predetermined engagement position is reached, the elastic locking pieces elastically return
Implementation Method 2
an upper surface of each bent portion forms a smoothly continuous curved surface around an axis of the support column, and is formed such that a direction from an outer edge of the curved surface when seen in an axial direction of the support column toward a lowest end of the elastic locking piece
Data Source
AI summary
Objects are: to make a fixing structure in which an engagement part of a fixing member is inserted and fixed in a through hole of a plate-shaped member, into a structure in which the fixing member is easily detached from the through hole and is less likely to be damaged or broken when being detached; and to, in doing so, maintain the dustproof and waterproof performance, the molding processability, and the elasticity of a dish-like contact portion of the fixing member at the conventional level, and suppress a size increase. To attain these objects, in a fixing structure, arc-shaped bent portions are respectively formed at both ends of a dish-like contact portion which annularly contacts a through hole surrounding portion from a near side in an insertion direction, and are guide portions for a detachment jig to enter the inside of the dish-like contact portion in the fixing structure.