Segmented Wire Harness Fixing Structure for Vibration Isolation
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Solution Overview
Problem
Wire harnesses covered with corrugated tubes experience damage due to differential vibrations at connected ends, leading to reduced insulating and electromagnetic wave-blocking performance, as wires or braids frictionally contact the tube's inner surface.
Innovation Solution
A wire harness fixing structure where the corrugated tube is divided into sections, with a fixing device holding the exposed wire or braid at division points, preventing vibration transmission and contact with the tube's inner surface, and using elastic members or notches to secure the wire or braid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the wire harness is not fixed within the corrugated tube, then the installation operation is simpler, but the wires slide in contact with the inner surface of the corrugated tube during differential vibrations, causing damage and reduced insulating performance
Solution Approach 1:
The corrugated tube is divided into multiple sections along its longitudinal direction, creating division portions where wires are exposed and can be fixed to the mounting portion. This segmentation allows the wire harness to be divided into vibration-allowing portions (within corrugated tube sections) and vibration-preventing portions (at division portions where wires are fixed), thereby preventing sliding contact and damage while maintaining installation simplicity.
2Reliability
If the wire harness is fixed at multiple points along the corrugated tube, then vibration-induced sliding and damage are prevented, but the device complexity and installation time increase
Solution Approach 1:
The corrugated tube is segmented into multiple sections, with wires fixed only at the division portions between sections rather than continuously along the entire length. This reduces the number of fixing locations needed while still effectively preventing vibration-induced sliding and damage, thereby lowering device complexity and installation time.
Solution Approach 2:
The division portions of the corrugated tube serve as intermediary fixing points where wires are exposed and can be secured to the mounting portion. These intermediary points act as vibration isolation zones, preventing the transmission of differential vibrations between the mounting portion and the engine-side connection, thereby protecting the wires without requiring continuous fixing.
3Reliability
If the corrugated tube is divided into sections with exposed wire portions, then vibration transmission is interrupted and wire damage is prevented, but the manufacturing complexity increases
Solution Approach 1:
The corrugated tube is manufactured as a segmented structure with division portions where the tube is separated or opened, allowing wires to be exposed and fixed. This segmentation can be achieved through simple slits or separations during the extrusion or assembly process, making the manufacturing complexity manageable while providing the vibration isolation benefits.
Solution Approach 2:
The corrugated tube has different structural qualities at different locations: most sections maintain the closed corrugated structure for protection, while division portions are locally modified to expose wires for fixing. This local quality change allows the tube to provide both protection and vibration isolation functions without requiring complete structural redesign.
Data Source
AI summary
There is disclosed a wire harness fixing structure for fixing a wire harness to a mounting portion, the wire harness comprising wires, and a corrugated tube through which the wires pass. The corrugated tube is divided into a plurality of sections in a longitudinal direction thereof. That portion of the wires exposed at a division portion is held by a fixing device, and the fixing device is fixed to the mounting portion.