Movable Tire Noise Damper Using Open-Cell Foam
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing tire noise dampers, when permanently affixed to the innerliner, are limited in their ability to effectively reduce noise emissions as they do not allow for movement within the tire cavity, restricting their noise reduction capabilities.
Innovation Solution
A noise damper comprising a compressible and elastic open-cell foam body with a thin film made of ultra-high-molecular-weight polyethylene, bonded with an adhesive, which is designed to conform to the tire innerliner and is free to move within the tire cavity, reducing tire noise by at least 5 dB.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the noise damper is permanently affixed to the tire innerliner, then the structure is stable and fixed in position, but the noise reduction capability is limited due to inability to move within the tire cavity
Solution Approach 1:
The noise damper is designed to be movable within the tire cavity rather than permanently affixed, allowing it to dynamically adjust its position in response to tire deformation and noise sources. This dynamic capability enables the damper to maintain optimal contact with the innerliner surface throughout tire operation, significantly improving noise reduction effectiveness while maintaining structural integrity through the foam body's compressible and elastic properties
2Object-affected harmful factors
If the noise damper is made from compressible and elastic open-cell foam, then the noise absorption capability is enhanced, but the structural rigidity is reduced
Solution Approach 1:
The noise damper utilizes compressible and elastic open-cell foam as its primary material, which provides excellent noise absorption capabilities through its porous structure. The open-cell configuration allows sound waves to penetrate and dissipate energy within the foam matrix, effectively reducing tire noise while maintaining the structural flexibility needed for movement within the tire cavity
Solution Approach 2:
The noise damper combines open-cell foam with a thin film having high friction characteristics, creating a composite structure that leverages the noise absorption properties of the foam while the thin film provides enhanced grip and stability against the innerliner surface, effectively compensating for the reduced rigidity of the foam material
3Force
If a thin film with high friction coefficient is added to the foam body, then the grip against innerliner is improved, but the device complexity increases
Solution Approach 1:
A thin film with high friction characteristics is applied to the surface of the foam body, providing enhanced grip against the tire innerliner. This thin film layer is sufficiently flexible to conform to the innerliner surface while providing the necessary friction to prevent slippage, and its thin profile minimizes the increase in overall device complexity
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 solution allows for enhanced noise reduction by enabling the noise damper to effectively absorb and dissipate sound energy, resulting in a significant decrease in tire noise emissions while maintaining flexibility and adaptability within the tire environment.
Implementation Method 1
The foam body is made of compressible and elastic open-cell foam. The foam body absorbs and dissipate sound energy, resulting in a significant decrease in tire noise emissions
Implementation Method 2
The foam body is made of compressible and elastic open-cell foam
Implementation Method 3
The foam body is made of compressible and elastic open-cell foam
Implementation Method 4
the thin film is made of ultra-high-molecular-weight polyethylene and has a coefficient of friction of 0.07-0.12
Data Source
AI summary
A noise damper, annulus for reducing tire noise, and tire and noise damper assembly are disclosed. The noise damper, annulus for reducing tire noise, and tire and noise damper assembly mitigate sound produced by a moving tire. The noise damper and annulus for reducing tire noise may move within a tire cavity.