Wire Harness Vibration Suppression via Inward Projections
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Solution Overview
Problem
Conventional wire harnesses experience vibration-induced damage due to conductive paths shaking within the outer member during automobile operation, with existing countermeasures either reducing vibration efficiency or complicating the insertion process.
Innovation Solution
A wire harness design incorporating a tubular outer member with inward projection portions on vibration suppressing members that reduce the movable range of conductive paths, attached after path insertion to maintain high insertion efficiency and suppress vibrations, particularly in straightly routed portions prone to shaking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If members are provided to suppress vibration of the conductive path inside the outer member, then vibration suppression is improved, but the efficiency of work of inserting the conductive path into the outer member is lowered
Solution Approach 1:
The vibration suppressing member is designed with an attachment portion that allows it to be attached to the outer member after the conductive path has been inserted. This preliminary arrangement of the attachment mechanism enables the vibration suppression function to be activated only when needed, without interfering with the insertion process. The inward projection portion is pre-configured to engage with the outer member surface, creating a stop that limits conductive path movement once the member is attached.
Solution Approach 2:
The vibration suppressing member is segmented into distinct functional portions: an inward projection portion that contacts the conductive path to suppress vibration, and an attachment portion that engages with the outer member. This segmentation allows the vibration suppression function and the attachment function to be separated in time and space, enabling efficient insertion followed by effective vibration suppression.
2Reliability
If the diameter of the outer member is decreased, then vibration suppression is improved, but the efficiency of work of inserting the conductive path into the outer member is lowered
Solution Approach 1:
Instead of changing the overall diameter of the outer member, the invention introduces localized vibration suppression features through the inward projection portion of the vibration suppressing member. This local quality approach maintains the original outer member dimensions and insertion efficiency while providing targeted vibration suppression at specific locations where the conductive path contacts the inner surface.
3Ease of manufacture
If the conductive path is routed straightly under the floor, then installation is simplified, but vibration-induced damage to the covering increases
Solution Approach 1:
The inward projection portion of the vibration suppressing member creates a preliminary counter-action by providing a stop that prevents the conductive path from contacting the outer member inner surface during vibration. This anticipatory constraint protects the covering from damage before vibration-induced contact can occur, allowing straight routing under the floor to be maintained without compromising covering integrity.
Data Source
AI summary
A wire harness includes: a tubular outer member; a conductive path which is inserted in and protected by the outer member; and a vibration suppressing member which reduces a movable range of the conductive path to suppress shakes of the conductive path. The vibration suppressing member includes an inward projection portion which projects inward from a tube inner surface of the outer member in a state in which the vibration suppressing member is attached to the outer member from a side of a tube outer surface after insertion of the conductive path.