Door Harness Attaching Structure With Segmented Opening
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Solution Overview
Problem
Conventional door harness attaching structures face challenges in assembling workability, cost due to long electric wire lengths, high component costs of grommets, and reduced noise reduction and waterproofing effects.
Innovation Solution
A door harness attaching structure featuring a sub opening on the door inner panel for easy grommet assembly, a cover member to seal the opening, and a groove for guiding the harness portion, reducing the need for multiple grommets and enhancing waterproof and noise reduction properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a through-hole is provided on the door frame and a grommet is inserted to route the door harness, then waterproofing is improved, but assembling workability deteriorates due to the need for penetrating work and handling long electric wires
Solution Approach 1:
The opening is segmented into a main opening covered by the panel unit and a sub opening notched toward the hole and covered by the cover member. This segmentation allows the grommet to be attached through the sub opening without penetrating the entire door structure, improving assembling workability while maintaining waterproofing through the cover member
Solution Approach 2:
The cover member acts as an intermediary element that covers the sub opening after grommet attachment. It provides a sealing function without requiring the grommet to penetrate through the entire door structure, thus improving assembling workability while maintaining waterproofing
2Adaptability or versatility
If the wiring harness is routed in a devious route to avoid interference with the window glass, then interference is avoided, but the electric wire length increases causing higher cost
Solution Approach 1:
The sub opening is notched toward the hole in a direction that allows the grommet and wiring harness to be routed without interfering with the window glass lifting path. This dimensional adjustment enables a more direct routing path, reducing electric wire length while avoiding interference
3Reliability
If multiple grommets and components are used to seal openings and route the harness, then sealing effectiveness is improved, but component cost increases
Solution Approach 1:
The main opening and sub opening are merged into a single opening structure where the panel unit covers the main opening and the cover member covers the sub opening. This merging allows effective sealing to be achieved with coordinated simple components rather than multiple complex grommets, reducing component cost while maintaining sealing effectiveness
Data Source
AI summary
A door harness attaching structure includes: an opening provided on an inner panel of a hinge-open/close-type door; and a hole provided on an end wall at the hinge side of the inner panel. The opening is composed of a large main opening covered by a panel unit of a door module and a small sub opening continued to the main opening, notched toward the hole for attaching a grommet and covered by a cover member. A wiring harness of the door module includes: a harness portion projecting from the panel unit; and the grommet provided at a tip end of the harness portion and attached through the hole.