Wire Harness Insulation Reliability Bending Compression
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Solution Overview
Problem
Conventional wire harnesses in vehicles experience a decrease in insulation reliability due to compression of electric wires within metal pipes during bending, leading to reduced thickness of insulating coatings and potential electrical issues.
Innovation Solution
A wire harness configuration featuring first and second electric wire members, with a tubular member and fixing members that allow for specific arrangements to prevent compression, ensuring the insulating coatings are not damaged and maintaining insulation reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the metal pipe is bent with electric wires inserted, then the wire harness can be routed flexibly, but the electric wires are compressed causing insulation reliability to decrease
Solution Approach 1:
The patent applies preliminary action by pre-arranging the electric wires in a specific configuration before bending the metal pipe. The wires are positioned such that they are not located between the inner circumferential surface of the bent portion and the outer circumferential surface of another wire, preventing compression during the bending process while maintaining routing flexibility
2Volume of moving object
If multiple electric wires are arranged closely to reduce space, then the wire harness becomes more compact, but compression occurs during bending reducing insulation thickness
Solution Approach 1:
The patent applies local quality by creating different spatial arrangements for different sections of the wire harness. Specifically, in the bent portion area, wires are arranged to avoid compression zones, while in other areas they can be closely packed. This localized differentiation allows compact overall volume while protecting insulation reliability in critical bending regions
Data Source
AI summary
A wire harness including a plurality of first electric wire members that each have a first flexible electric wire and a hard electric wire electrically connected to the first flexible electric wire: a plurality of second electric wire members that are second flexible electric wires: a tube through which the plurality of first electric wire members and the plurality of second electric wire members pass: and a first fixing member for bundling the plurality of first electric wire members and the plurality of second electric wire members, wherein: the tube includes a bend closest to an end surface in a longitudinal direction of the tube, and the wire harness is configured to achieve a first arrangement and a second arrangement.