Foamed Tire Noise-Reducing Element Without Urea Migration
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Solution Overview
Problem
Existing soundproofing technologies for vehicle tires, particularly those using urea in elastomeric materials, face issues such as skin and eye irritation, material instability, and migration phenomena, leading to unsightly surface effects and compromised vulcanization kinetics.
Innovation Solution
A soundproof tire design utilizing a vulcanized noise reducing element made from a foamable elastomeric compound comprising natural or synthetic elastomeric polymers, reinforcing fillers, expanding agents, fatty acid amides, and polymers or copolymers of caprolactone, lactic acid, or glycolic acid, without the use of urea, to effectively reduce cavity noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If urea is used in elastomeric materials for soundproofing, then noise reduction performance is improved, but material stability deteriorates and harmful effects occur
Solution Approach 1:
The patent removes urea from the elastomeric composition entirely, extracting the harmful substance while maintaining the soundproofing function through alternative compounds and formulation approaches
Solution Approach 2:
The patent changes the chemical composition parameters by substituting urea with alternative compounds and adjusting the ratios of elastomeric polymers, reinforcing fillers, and other additives to achieve stable vulcanization without urea-induced devulcanization
2Object-generated harmful factors
If urea is used in elastomeric materials, then noise reduction is achieved, but skin and eye irritation occurs
Solution Approach 1:
The patent eliminates urea from the composition, removing the source of skin and eye irritation while maintaining soundproofing performance through alternative elastomeric formulations
Solution Approach 2:
The patent uses alternative compounds that are safer for workers during manufacturing and handling, prioritizing worker safety and ease of handling over the problematic urea-based system
3Object-generated harmful factors
If urea is used in elastomeric materials, then noise reduction performance is improved, but vulcanization kinetics are compromised
Solution Approach 1:
The patent removes urea from the composition, eliminating its interfering effect on vulcanization kinetics and allowing for more predictable and controllable curing processes
Solution Approach 2:
The patent adjusts the vulcanization system parameters by removing urea and optimizing the combination of vulcanizing agents, accelerators, and activators to achieve reliable and consistent vulcanization kinetics
4Object-generated harmful factors
If urea is used in elastomeric materials, then noise reduction is achieved, but migration phenomena occur causing unsightly surface effects
Solution Approach 1:
The patent eliminates urea from the elastomeric composition, removing the substance responsible for migration phenomena and associated surface defects
Solution Approach 2:
The patent modifies the chemical composition parameters by substituting urea with alternative compounds that exhibit better dimensional stability and resistance to migration during processing and service
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 achieves similar or improved noise reduction performance while eliminating the drawbacks associated with urea, ensuring stable material properties and consistent vulcanization, resulting in enhanced passenger comfort by significantly reducing cavity noise transmission.
Implementation Method 1
a vulcanised layer of airtight elastomeric compound (liner)... a noise reducing element made of foamed elastomeric material disposed in a radially inner position with respect to the vulcanised layer
Implementation Method 2
The sound-absorbing material is capable of breaking down the sound wave, converting the energy of the incident sound into heat
Implementation Method 3
a vulcanisable layer of elastomeric compound... obtained by mixing an elastomeric composition... vulcanising agent
Data Source
AI summary
The present invention relates to a soundproof tyre for vehicle wheels comprising a noise reducing element made by vulcanising a vulcanisable and expandable elastomeric compound comprising at least one elastomeric polymer, at least one expanding agent, and at least one compound selected from the group of (i) fatty acid amides and (ii) polymers and copolymers of caprolactone, lactic acid, glycolic acid, and mixtures thereof.