Vehicle Grommet Sound Insulation Protrusions
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Solution Overview
Problem
Conventional grommets for vehicles fail to achieve optimal sound insulation performance without compromising attachability and deformability, leading to a trade-off in performance and workability.
Innovation Solution
A grommet design featuring a main body with a plate-shaped portion and sound insulation protrusions that protrude in an annular or arc shape, allowing for improved sound insulation while maintaining deformability and ease of attachment, by incorporating concentrically arranged first and second sound insulation protrusions that face gaps across the plate-shaped portion, enhancing sound insulation without increasing the overall thickness uniformly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the grommet uses a conventional design without sound insulation protrusions, then the structure remains simple and attachability is maintained, but sound insulation performance is insufficient
Solution Approach 1:
The invention applies local quality by adding sound insulation protrusions only at specific locations on the grommet body where sound transmission occurs, rather than uniformly increasing the entire structure. These protrusions are positioned to contact the inner peripheral surface of the through hole, creating localized sound insulation barriers that block sound paths without requiring complex overall redesign of the grommet structure.
Solution Approach 2:
The sound insulation structure is segmented into multiple protrusions distributed around the grommet body, with each protrusion independently contributing to sound insulation. This segmentation allows the sound insulation function to be achieved through multiple simple elements rather than one complex structure, maintaining manufacturability while improving performance.
2Object-affected harmful factors
If the grommet thickness is increased uniformly to improve sound insulation, then sound insulation performance improves, but deformability and ease of attachment deteriorate
Solution Approach 1:
Instead of uniformly increasing grommet thickness, the invention locally adds thickness only at the sound insulation protrusions. The main body of the grommet retains its original thin profile, preserving deformability for easy attachment, while the localized protrusions provide the necessary sound insulation where needed at the through hole interface.
3Ease of operation
If the grommet structure is simplified for easy attachment, then attachability improves, but sound insulation performance deteriorates
Solution Approach 1:
The invention merges the sound insulation function with the existing grommet structure by integrating protrusions into the body. This combination allows the grommet to simultaneously perform its primary function of providing a sealing interface for easy attachment and the additional function of sound insulation, without requiring separate components or complex assembly steps.
Data Source
AI summary
A grommet includes a main body that fits into a through hole penetrating an attachment target in an axial direction to waterproof the through hole and that allows a wiring member to be inserted into an inner portion in the axial direction. The main body includes a plate-shaped portion extending in intersecting directions that intersect the axial direction so as to close at least a portion of the through hole, and a sound insulation wall portion having a sound insulation protrusion that protrudes from the plate-shaped portion in the axial direction so as to be formed in an annular or arc shape centered around a central axis in the axial direction.