Vehicle Wire Harness Fixing Structure for Heavy-Wire Vibration Damping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Large cross-sectional area wires in wire harnesses conducting high voltage electricity apply excessive load to the fixing portion due to vehicle vibrations, risking damage.
Innovation Solution
A wire harness design featuring a tubular member with a hard tube portion and an elastic portion, where the hard tube portion has higher rigidity than the fixing portion and the elastic portion has higher elasticity, located between the outer and inner circumferential surfaces of the through hole, to absorb axial forces and suppress vibration transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wire with a large cross-sectional area is used to conduct high voltage electricity, then the electrical conductivity is improved, but the weight of the wire increases and excessive load is applied to the fixing portion during vehicle vibrations
Solution Approach 1:
The fixing portion is segmented into multiple functional layers: a base fixing portion, an elastic portion with cellular structure, and a hard tube portion. This segmentation allows each layer to specialize in specific functions - the base provides structural support, the elastic portion absorbs vibration energy, and the hard tube reinforces the bolt insertion area - thereby supporting heavier wires without excessive load on the fixing portion.
Solution Approach 2:
The fixing portion uses composite material structure combining different material properties: the elastic portion uses cellular material for vibration absorption, the hard tube portion uses high rigidity material for structural support, and these are integrated with the base fixing portion to create a composite structure that can handle the weight and vibration loads of large cross-sectional area wires.
2Strength
If the fixing portion is made with high rigidity to support heavy wires, then the load-bearing capacity is improved, but the vibration absorption capability deteriorates
Solution Approach 1:
Different parts of the fixing portion have different mechanical properties tailored to their specific functions: the elastic portion has high elasticity and low rigidity for vibration absorption, while the hard tube portion has high rigidity for structural support and bolt fixation. This local differentiation of material properties allows the overall structure to simultaneously achieve vibration absorption and load-bearing capacity.
Solution Approach 2:
The elastic portion with cellular structure is positioned between the heavy wire and the base fixing portion to provide beforehand cushioning against vibration impacts. This elastic layer absorbs vibration energy before it can be transmitted to the rigid base structure, protecting the fixing portion from vibration-induced damage while maintaining load-bearing capacity.
3Device complexity
If a simple fixing structure is used, then the device complexity is reduced, but the vibration absorption capability deteriorates
Solution Approach 1:
The fixing portion employs a nested structure where the elastic portion is positioned between the base fixing portion and the hard tube portion, and the hard tube portion is inserted into the base fixing portion. This nested arrangement integrates multiple vibration absorption and load-bearing functions within a compact, unified structure that does not significantly increase overall complexity while providing superior vibration protection.
4Strength
If the hard tube portion has high rigidity for structural support, then the load distribution is improved, but the ease of insertion into the through hole deteriorates
Solution Approach 1:
The elastic portion provides dynamic compliance during the insertion process, allowing the hard tube portion to be inserted into the through hole with reduced friction and resistance. The elastic material deforms to accommodate the insertion motion and then rebounds to provide continuous support, making the insertion process easier while maintaining the high rigidity and structural support function of the hard tube portion.
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
Reduces load on the fixing portion, preventing damage by absorbing vibrations and improving workability during attachment.
Implementation Method 1
an elastic portion that has a higher elasticity than the fixing portion, and the elastic portion is located between an outer circumferential surface of the hard tube portion and an inner circumferential surface of the through hole
Data Source
AI summary
A wire harness for a vehicle, the wire harness including: a wire; and a wire fixing member that includes a holding portion that holds the wire and a fixing portion that is configured to be fixed to a vehicle by fastening a bolt, wherein: the wire has a size of 50 sq or more, the fixing portion includes a tube that is provided inside a through hole extending through the fixing portion, the tube includes: a hard tube portion that includes an insertion hole through which the bolt used for fastening is inserted and has a higher rigidity than the fixing portion; and an elastic portion that has a higher elasticity than the fixing portion, and the elastic portion is located between an outer circumferential surface of the hard tube portion and an inner circumferential surface of the through hole.