Tire Noise Reduction Device Using Thermoplastic Elastomer Film
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Solution Overview
Problem
Existing tire noise reduction devices using porous materials on the inner tire surface are damaged by friction and become ineffective in cold weather due to the brittleness of thermoplastic resin films used as protective layers.
Innovation Solution
A tire noise reduction device featuring a thermoplastic elastomer composition film as a protective layer on the outer surface of the porous noise absorbing member, which maintains flexibility and prevents brittleness at low temperatures, ensuring the noise absorbing member's durability even in cold conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a thermoplastic resin film is used as a protective layer on the noise absorbing member, then the protective layer effectively prevents damage from friction, but the protective layer becomes brittle and broken at low temperatures
Solution Approach 1:
The invention changes the material parameters by using a thermoplastic elastomer composition instead of a conventional thermoplastic resin. The key parameter change is the glass transition temperature, which is lowered from typical thermoplastic resin values (above -50°C) to extremely low values (-70°C or below) through the selection of specific elastomer components and their ratios, ensuring the protective layer remains flexible at low temperatures
Solution Approach 2:
The invention uses a composite material system consisting of a thermoplastic resin and an elastomer forming a thermoplastic elastomer composition. The elastomer component (such as polybutadiene, polyisoprene, or styrene-butadiene rubber) is dispersed in the thermoplastic resin matrix, creating a composite that combines the protective properties of the resin with the low-temperature flexibility of the elastomer
2Object-generated harmful factors
If the noise absorbing member is made of porous material and arranged on the inner circumferential surface of the tire, then the device reduces cavity resonance noise, but the noise absorbing member is damaged by friction with the tire during rotation
Solution Approach 1:
The thermoplastic elastomer composition film serves as an intermediary protective layer between the noise absorbing member and the tire's inner circumferential surface. This film absorbs the friction and mechanical stress during tire rotation, preventing direct contact and damage to the porous noise absorbing member while allowing the noise reduction function to continue operating effectively
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 thermoplastic elastomer composition film effectively prevents damage to the noise absorbing member from friction and maintains its protective function in cold weather, significantly increasing the tire noise reduction device's durability and longevity.
Implementation Method 1
the glass transition temperature of the thermoplastic elastomer composition is extremely lower than that of the thermoplastic resin so that the protective layer does not become brittle and broken
Data Source
AI summary
Provided is a tire noise reduction device including an annular noise absorbing member which is made of a porous material, and which is arranged on the inner circumferential surface of a tire. A protective layer made of a thermoplastic elastomer composition obtained by dispersing an elastomer in a thermoplastic resin is arranged on the outer circumferential surface of the annular noise absorbing member.