Wire Harness Heat Insulating Sheath Design
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Solution Overview
Problem
Existing wire harness designs with external heat insulating sheaths wound around the entire circumference of electrical wires fail to effectively dissipate heat, leading to high temperatures for the wires near a heat source.
Innovation Solution
A wire harness design featuring a protective member with an external heat insulating sheath wound around a substantial semicircumference, creating a heat insulating part that reflects heat and a heat radiating part that allows heat to escape, balancing insulation and radiation effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the external heat insulating sheath is wound around the entire circumference of the electrical wires, then the heat insulating effect is improved, but the heat cannot escape and the electrical wires are exposed to high temperature environment
Solution Approach 1:
The external heat insulating sheath is segmented into two distinct functional zones: a heat insulating part that covers a substantial semicircumference of the protective member to block heat from the heat source, and a heat radiating part where the sheath is not wound to allow heat to escape. This segmentation resolves the contradiction by creating separate regions for heat blocking and heat dissipation.
Solution Approach 2:
Different portions of the wire harness are given different thermal properties: the heat insulating part has high thermal insulation characteristics to prevent heat ingress, while the heat radiating part has heat dissipation characteristics. This local differentiation of thermal properties allows the system to both block and release heat effectively.
2Object-affected harmful factors
If the external heat insulating sheath covers the entire circumference, then heat blocking is improved, but heat dissipation deteriorates
Solution Approach 1:
The sheath configuration is segmented to create distinct heat insulating and heat radiating parts, allowing the system to simultaneously achieve heat blocking and heat dissipation functions through spatial separation of these opposing thermal management goals.
Solution Approach 2:
The heat insulating part is designed with high insulation properties to block heat, while the heat radiating part is designed to facilitate heat loss. This local quality differentiation enables the wire harness to both prevent heat ingress and promote heat egress.
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 design efficiently protects electrical wires from high temperatures by reflecting heat with the insulating part and dissipating it through the radiating part, maintaining a balance between insulation and radiation, thus effectively managing heat exposure.
Implementation Method 1
an external heat insulating sheath that is wound around the protective member so as to cover a part of an outer circumferential surface of the protective member
Implementation Method 2
a portion of the wire harness, around which the external heat insulating sheath is not wound, becomes a heat radiating part
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3(a)~3(c)
AI summary
A wire harness (1) is comprises an electric wire (10), a protective member (20) provided so as to cover the external periphery of the electric wire, and a heat-shielding jacket (30) wound around the protective member so as to cover a portion of the outer surface of the protective member in the peripheral direction.