Nested Grommet Bracket Structure for Multi-Wire Waterproof Sealing
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Solution Overview
Problem
Existing grommet units for vehicles require complex assembly processes and additional holes for inserting electric wires, leading to impractical and space-consuming procedures.
Innovation Solution
A grommet unit comprising flexible grommets and rigid brackets that allow for simple coupling by attaching a first bracket to cover an opening, followed by attaching a second bracket to cover a through-hole, with integrated sealing portions to prevent water ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electric wires are inserted through separate coupling processes, then each wire can be individually connected, but additional holes and space are required
Solution Approach 1:
The patent combines multiple wire insertion functions into a single coupling hole. The first and second brackets both pass through the same hole in the body panel, allowing multiple electric wires to be connected through one opening rather than requiring separate holes for each wire, thereby reducing the space required in the body panel.
Solution Approach 2:
The patent implements a nested structure where the second bracket is inserted through the first bracket. The second bracket passes through the first bracket's opening and is secured by the first grommet, creating a nested arrangement that allows multiple wires to share the same coupling hole while maintaining individual connection capabilities.
2Adaptability or versatility
If retrofitted electric wires are inserted through the grommet unit, then wire connections can be updated, but the grommet unit and wires must be removed from the body panel
Solution Approach 1:
The patent segments the coupling system into separate brackets and grommets that can be independently manipulated. The first bracket with its grommet can be removed and reattached, allowing wire retrofits without requiring complete disassembly. The modular structure enables maintenance while keeping the overall system attached to the body panel.
Solution Approach 2:
The patent creates a dynamic coupling system where brackets can be detached and reattached to the body panel. The first bracket is secured by a fastening member that allows for removal and reattachment, enabling wire retrofits without permanent fixed installation, thus reducing procedure complexity compared to complete removal and reinstallation.
3Reliability
If multiple separate grommet units are used for multiple wires, then each wire is sealed independently, but the number of components and holes increases
Solution Approach 1:
The patent merges multiple sealing functions into a single integrated structure. The first grommet seals around both the first and second electric wires simultaneously within the first bracket, and the second grommet seals the second wire within the second bracket. This combined approach maintains waterproof sealing for multiple wires while using fewer components than separate grommet units for each wire.
Solution Approach 2:
The first bracket and its associated grommet serve multiple functions: they seal the first wire, seal the second wire, and provide structural support for both brackets. The first grommet acts as both a seal for the first wire and a fastening element securing the second bracket, reducing the total component count while maintaining reliable waterproof sealing.
Data Source
AI summary
A grommet unit according to one aspect of the present disclosure comprises a first grommet, a second grommet, a first bracket, and a second bracket. The first bracket is attached to a body panel so as to cover an opening. The first bracket has a first through-hole through which the first grommet is inserted and a second through-hole through which the second grommet is inserted. The second bracket is attached to the first bracket so as to cover the second through-hole. The second bracket has a third through-hole which is provided at a position that overlaps with the second through-hole and through which the second grommet is inserted.