Branch-Covering Grommet Structure for Easier Wire Harness Winding
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Solution Overview
Problem
Existing grommets face increased work load and mental burden during tape winding due to larger amounts of winding required for wiring members with smaller outer diameters, particularly affecting the ease of assembly.
Innovation Solution
The grommet design includes a winding portion with first and second winding pieces that intersect in different directions, featuring cutout portions to reduce the winding amount and mental burden, ensuring effective tape winding and sound insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional grommet design is used with a simple winding portion, then the structure is simple and easy to manufacture, but the work load and mental burden during tape winding increases for wiring members with smaller outer diameters
Solution Approach 1:
The winding portion is divided into multiple winding pieces (first winding piece, second winding piece, third winding piece) that extend in different directions. Each winding piece independently wraps around the wiring member, segmenting the winding function to reduce the overall winding amount required and decrease operational complexity during assembly
Solution Approach 2:
The winding pieces are designed with asymmetric configurations where each piece extends in a specific direction (first direction, second direction, third direction) rather than uniform symmetry. This asymmetric design allows the winding portion to adapt to wiring members of varying diameters, reducing the mental burden during assembly by providing intuitive directional guidance
2Reliability
If the winding portion is designed to effectively cover branching portions of wiring members, then sound insulation and sealing are improved, but the complexity of the grommet structure increases
Solution Approach 1:
The winding portion serves multiple functions simultaneously: it provides sound insulation by covering branching portions, ensures waterproof sealing at the wiring member insertion location, and facilitates easy assembly through its segmented multi-directional structure. By integrating these functions into a single component design, the need for additional separate components is eliminated, maintaining structural simplicity while achieving reliable sound insulation
Solution Approach 2:
The multiple winding pieces are nested within the body portion of the grommet, with each winding piece positioned to wrap around specific portions of the wiring member. This nested configuration allows the winding portion to be integrated within the overall grommet structure without significantly increasing external complexity, while still providing effective sound insulation coverage
Data Source
AI summary
A grommet includes a winding portion that protrudes from a first end of a body portion in an axial direction, is formed in two different directions, and winds around and covers a branching portion of a wiring member. The winding portion includes a first winding piece extending in a first extending direction along the outer peripheral surface of the branching portion, a second winding piece extending in a second extending direction opposite to the first extending direction, and a first opening end formed at an end in one of the two directions of the winding portion in a wound state and from which a first wiring member extending from the branching portion is drawn out. The first winding piece has a first cutout portion cut out from a distal end of the first winding piece in the first extending direction to the first opening end.