Wire Harness Grommet with Sound Insulation Projections
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional grommets for wire harnesses allow noise and vibration to transmit from the engine compartment to the passenger compartment, increasing manufacturing costs when attempting to address this with fillers like sponges.
Innovation Solution
A grommet design featuring a main body with sound insulation projections, inner and outer tubes, and cantilevered fingers that dissipate sound energy through reflection and resonance, reducing noise transmission while maintaining water tightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the cavity of the grommet is filled with sponge or filler to prevent noise and vibration transmission, then sound insulation performance is improved, but manufacturing cost increases and productivity decreases
Solution Approach 1:
The grommet is divided into multiple bodies (first body, second body, third body) with distinct functions. The sound insulation projections are segmented structures that reflect sound waves, eliminating the need for filler materials while maintaining sound insulation performance and reducing manufacturing complexity.
Solution Approach 2:
Sound insulation projections with tapered reflective surfaces are designed to reflect and dissipate sound waves through controlled vibration and reflection mechanisms, converting acoustic energy into other forms without requiring filler materials, thus maintaining cost-effectiveness.
2Object-affected harmful factors
If the cavity of the grommet is filled with sponge or filler to prevent noise and vibration transmission, then sound insulation performance is improved, but productivity decreases
Solution Approach 1:
The grommet structure is segmented into multiple functional bodies with integrated sound insulation projections, eliminating the need for separate filler materials and simplifying the manufacturing process to improve productivity.
Solution Approach 2:
The sound insulation function is merged into the grommet's structural design through integrated projections, combining form and function into a single component that can be manufactured as one piece, thereby improving manufacturing efficiency.
3Ease of manufacture
If conventional grommet design with cavity is used, then manufacturing is simple, but noise and vibration transmit from engine compartment to passenger compartment
Solution Approach 1:
Sound insulation projections with tapered reflective surfaces utilize vibration reflection and dissipation mechanisms to block noise transmission while maintaining a simple integrated structure that can be manufactured without complex processes.
Solution Approach 2:
Sound insulation projections are strategically positioned in specific locations where noise transmission occurs, providing localized sound insulation functionality without requiring complex overall structural changes, thus maintaining manufacturing simplicity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively reduces noise transmission and maintains water tightness, improving sound insulation without increasing manufacturing costs.
Implementation Method 1
each sound insulation projection may have a tapered reflective surface
Implementation Method 2
a plurality of first fingers extending from the inner wall toward the first cavity in a cantilevered manner
Data Source
AI summary
A wire harness grommet is provided. The wire harness grommet includes a main body including a first body, a second body connected to the first body, and an inner wall located between the first body and the second body, an inner tube disposed in a center of the main body wherein the inner tube is configured to receive a wire harness, and a plurality of sound insulation projections on the main body, wherein each sound insulation projection has a tapered reflective surface.