Wire Harness Shielding Cover Heat Dissipation

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Solution Overview

Problem

Wire harnesses in electric and hybrid vehicles are susceptible to vibrations and heat, which can compromise their electromagnetic shielding effectiveness.

Innovation Solution

A wiring structure where the conducting path of the wire harness is in contact or holding state with a conductive shielding cover, featuring curved parts for heat transfer and vibration-absorbing means like C-shaped grooves, effectively transferring heat and suppressing vibrations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the wire harness is covered with a shielding cover for electromagnetic shield countermeasure, then electromagnetic shielding effectiveness is improved, but heat accumulation and vibration influence worsen

Engineering Contradiction:

Improveelectromagnetic shielding effectivenessVSAvoidheat accumulation

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

A heat dissipation member is introduced as an intermediary between the wire harness and the shielding cover. This member has heat conductive portions that contact the wire harness and heat radiating portions that extend toward the shielding cover, facilitating heat transfer from the wire harness through the intermediary to the shielding cover, thereby preventing heat accumulation while maintaining electromagnetic shielding effectiveness

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The heat dissipation member extends in the radial direction from the wire harness toward the shielding cover, creating a three-dimensional heat transfer path. This dimensional extension allows heat to be conducted outward from the wire harness core through the heat dissipation member to the shielding cover surface, effectively managing heat in the radial dimension without compromising the shielding cover's electromagnetic shielding function

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If the wire harness is covered with a shielding cover for electromagnetic shield countermeasure, then electromagnetic shielding effectiveness is improved, but vibration influence worsens

Engineering Contradiction:

Improveelectromagnetic shielding effectivenessVSAvoidvibration influence

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A vibration absorption member is introduced as an intermediary between the wire harness and the shielding cover. This member has vibration absorbing portions that contact the wire harness and vibration transmitting portions that extend toward the shielding cover, absorbing vibrations from the wire harness while allowing the shielding cover to maintain its electromagnetic shielding function without being directly affected by wire harness vibrations

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The vibration absorption member is positioned beforehand between the wire harness and shielding cover to provide cushioning against vibrations. This pre-positioned intermediary structure absorbs vibrations before they can be transmitted to the shielding cover, preventing vibration-induced damage or degradation of electromagnetic shielding effectiveness

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Temperature

If heat transfer path is provided between wire harness and shielding cover, then heat dissipation is improved, but device complexity worsens

Engineering Contradiction:

Improveheat dissipationVSAvoidstructure complexity

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

The heat dissipation member is designed to perform multiple functions: it provides heat conduction from the wire harness, extends heat radiating surfaces toward the shielding cover, and can also serve as structural support or positioning element. This multi-functionality allows effective heat dissipation to be achieved without proportionally increasing device complexity, as a single component accomplishes multiple objectives

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 reduces the influence of vibrations and heat on the wire harness, ensuring effective electromagnetic shielding and stability.

Implementation Method 1

the heat of the wire harness side can be transferred through the curved part of the wire harness and the convex part of the shielding cover to the shield cover side to be irradiated

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

the vibrations of the wire harness side can be also suppressed... the swing of the wire harness side is absorbed by the vibration-countermeasure means

Methodology Applied

Scientific EffectVibration damping: Damping

Data Source

PatentEP2619864B1Wiring structure of wire harness and shielding cover

Publication Date: 2016.07.20 YAZAKI CORP

Figure 1
Figure 2A~2B
Figure 3A~3B

AI summary

There is provided a wiring structure of wire harness capable of reducing an influence due to the swing and heat even in the case where the wire harness is subjected to the countermeasure against electromagnetic shield, and a shielding cover used for the wiring structure. In the wiring structure, a conducting path of a harness body of the wire harness and a conductive shielding cover that covers the wire harness are partly put into at least one of a contact state and a holding state directly or indirectly.