Electromagnetic Shield Pressing Mechanism for Wire Harness Thermal Expansion

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Solution Overview

Problem

Conventional electromagnetic shield members for wire harnesses in vehicles suffer from reduced heat conduction efficiency due to thermal expansion of electrical wires, leading to reduced contact surface area and potential wire floating, which deteriorates heat dissipation.

Innovation Solution

An electromagnetic shield member with a pressing mechanism that includes a cylinder, piston, spring, and piston rod to press and grip electrical wires, allowing for thermal expansion absorption and maintaining contact, while restricting rotation to prevent curving towards heat sources.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If electrical wires are housed in groove-shaped housing portions without pressing mechanism, then the structure is simple and easy to manufacture, but the electrical wires float from the inner surface due to thermal expansion, reducing contact surface area and heat conduction efficiency

Engineering Contradiction:

Improveheat conduction efficiencyVSAvoidstructure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The pressing mechanism uses a spring to provide elastic pressing force that can dynamically adapt to thermal expansion of the electrical wires. The spring's elastic deformation capability allows the system to maintain constant contact pressure despite temperature changes, ensuring reliable heat conduction without requiring complex adjustment mechanisms.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The spring in the pressing mechanism automatically adjusts to thermal expansion of the electrical wires through elastic deformation. This self-adjusting mechanism maintains continuous contact between the wires and the electromagnetic shield member without requiring external control or complex actuation systems.

Inventive Principle:

Principle #25Self-service

2Reliability

If a band member is used to press the electrical wire against the groove bottom wall, then the wire is constrained from floating, but the band member bites into the wire due to thermal expansion or vibration

Engineering Contradiction:

Improvewire contact stabilityVSAvoidwire damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The pressing mechanism replaces the rigid band member with a spring-based system that provides elastic pressing force. This allows the pressing force to dynamically adjust to wire movement from thermal expansion or vibration, maintaining contact stability without concentrating stress that would cause the wire to be bitten or damaged.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The spring in the pressing mechanism acts as a cushioning element that absorbs the effects of thermal expansion and vibration before they can cause harmful concentrated forces on the wire. This beforehand cushioning prevents the wire from being bitten while maintaining reliable contact.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Reliability

If the piston is restricted from rotating in the cylinder, then the pressing force is stable, but the electrical wire cannot accommodate thermal expansion by curving, leading to floating

Engineering Contradiction:

Improvepressing force stabilityVSAvoidthermal expansion accommodation

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The piston is designed to be able to rotate within the cylinder while maintaining pressing force through the grip on the electrical wire. This dynamic capability allows the system to simultaneously maintain stable pressing force and accommodate thermal expansion of the wire through controlled rotation and wire curving.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The pressing mechanism separates the pressing function (performed by the grip on the wire) from the structural constraint (cylinder walls). This segmentation allows the piston to rotate within the cylinder without directly constraining the wire, enabling the wire to curve and accommodate thermal expansion while maintaining contact pressure.

Inventive Principle:

Principle #1Segmentation

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 effectively suppresses wire floating and maintains heat dissipation efficiency by absorbing thermal expansion and ensuring consistent contact between wires and the shield member, preventing curving towards heat sources.

Implementation Method 1

displacement caused by thermal expansion or vibration of the electrical wire is absorbed by the spring

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

the efficiency of heat conduction from the electrical wires to the electromagnetic shield member is reduced

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS11700717B2Electromagnetic shield member and wire harness

Publication Date: 2023.07.11 AUTONETWORKS TECH LTD

AI summary

An electromagnetic shield member that includes a pressing mechanism with: a cylinder provided on one of a bottom wall of the groove and an opposing wall of the cover opposing the bottom wall of the groove; a piston provided so as to be capable of reciprocal movement in the cylinder; a spring that is provided in the cylinder, and is configured to bias the piston toward one end of the cylinder; and a piston rod that is coupled to the piston, protrudes from the one end of the cylinder, and has a leading end configured to press the electrical wire.