Tyre Noise-Reducing Layer Structure for Sealant Flowability
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Solution Overview
Problem
Existing solutions for reducing tyre cavity resonance noise and maintaining sealing integrity are ineffective as they cause physical interaction between the foam material and sealant layer, hindering the flowability of the sealant.
Innovation Solution
A process involving a fibre-reinforced rubber or pre-preg structure with anti-sticking elements, arranged in a staggered honeycomb pattern, is used to create a noise-reducing layer that can be integrated with the sealant layer without compromising sealing or noise-reducing properties, utilizing a vulcanization step under controlled pressure and temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a foam material layer is arranged in contact with the sealant layer to reduce noise, then noise reducing action is improved, but the sealant layer flowability is hindered due to physical interaction
Solution Approach 1:
The noise reducing layer is segmented into multiple fibre-reinforced rubber layers with through-cells, creating a structured porous material that reduces noise while maintaining sealant flowability through the distributed cellular structure
Solution Approach 2:
The invention uses composite fibre-reinforced rubber layers combining different materials (fibres and rubber matrix) to create a noise reducing layer that simultaneously provides acoustic damping and allows sealant penetration
2Strength
If fibre-reinforced rubber layers are vulcanized together to create structural integrity, then strength is improved, but chemical bonding between layers occurs which prevents sealant flowability
Solution Approach 1:
The noise reducing layer is divided into multiple discrete fibre-reinforced rubber layers separated by spacing elements, maintaining structural integrity through the layered construction while preventing chemical bonding between layers that would block sealant flow
Solution Approach 2:
Spacing elements act as intermediaries between fibre-reinforced rubber layers during vulcanization, preventing direct chemical bonding while maintaining the structural framework necessary for noise reduction
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
This approach allows for effective noise reduction while maintaining the sealing performance by preventing chemical bonding between rubber layers and ensuring the structural integrity of the fibre-reinforced structure, allowing for efficient removal and integration with the sealant layer.
Implementation Method 1
the anti-sticking elements being in a liquid state... prevents chemical bonding between rubber layers and ensuring the structural integrity
Implementation Method 2
a vulcanization step, during which said stack (1) of fibre-reinforced rubber or pre-preg layers is subjected to a compacting pressure and to a fibre-reinforced rubber or pre-preg vulcanization temperature
Implementation Method 3
The porous material works by reducing the section available to the propagating pressure waves and contributes by dissipating the pressure waves
Data Source
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AI summary
A process for manufacturing a noise reducing layer designed to be housed inside the cavity of a tyre and comprising: • - a stacking step, during which a stack (1) of fibre-reinforced rubber layers is created, in which between one layer and the other there is interposed a plurality of anti-sticking elements (2) spaced apart from one another; said anti-sticking elements being arranged in a staggered position along the two faces of a same fibre-reinforced rubber layer; • - a vulcanization step, during which said stack (1) of fibre- reinforced rubber or pre-preg layers is subjected to a compacting pressure and to a fibre-reinforced rubber or pre-preg vulcanization temperature; • said anti-sticking elements (2) being in a liquid state.