Grommet Assembly Structure for Wire Harness Water Cutoff
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Solution Overview
Problem
Existing grommet assemblies and wire harnesses face issues with deformation under tension, leading to a compromised water cutoff function.
Innovation Solution
The proposed grommet assembly includes a grommet with a supporting part that features a first extending part and a second extending part, which are held between the inner member and the protector, preventing deformation and maintaining the water cutoff function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the grommet is pressed against the panel by a protector, then the grommet is fixed in position, but the grommet deforms when wiring material is pulled, compromising the water cutoff function
Solution Approach 1:
The supporting part is divided into multiple extending parts (first extending part and second extending part) that are distributed between the inner member and protector. This segmentation allows the supporting part to resist pulling forces through distributed support points, preventing deformation of the grommet while maintaining the water cutoff function.
Solution Approach 2:
The supporting part integrates the grommet and inner member into a unified structure where the first and second extending parts connect these components. This merging ensures that when the wiring material is pulled, the force is distributed across both the grommet and inner member, preventing deformation and maintaining structural stability for reliable water cutoff.
2Reliability
If the grommet structure is simplified, then the device complexity is reduced, but the grommet cannot prevent deformation under tension
Solution Approach 1:
The supporting part is segmented into a first extending part extending radially and a second extending part extending axially. This segmentation provides effective deformation prevention through distributed structural elements without requiring a completely complex redesign, balancing reliability with manageable structural complexity.
Solution Approach 2:
The supporting part utilizes both radial extension (first extending part) and axial extension (second extending part) to provide multi-dimensional support. This approach enhances deformation prevention capability by distributing forces across different spatial dimensions, achieving improved reliability without excessive complexity.
Data Source
AI summary
A grommet assembly includes a grommet attached to a through hole formed on a panel, an inner member supported by the grommet, and a protector that is attached to the panel while covering the grommet and the inner member. The grommet includes a supporting part that supports the inner member. The supporting part includes a first extending part that extends from an outer side toward an inner side in a radial direction to be held between the inner member and the protector, and a second extending part that extends in an axial direction while being bent from the first extending part to be held between the inner member and the protector.