Tread Rubber Composition for Fuel-Efficient Wear-Resistant Tires
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Solution Overview
Problem
The challenge is to develop a tire that balances fuel economy, abrasion resistance, and handling stability while minimizing the use of carbon black and silica, as reducing these fillers compromises the strength and rigidity of the tread rubber.
Innovation Solution
A tire with a tread rubber composition comprising isoprene-based rubber, polybutadiene rubber, and styrene-butadiene rubber, where the isoprene-based rubber content exceeds both polybutadiene and styrene-butadiene rubber content, and silica content is equal to or greater than carbon black content, ensuring specific tan δ and negative ratio values to enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the amount of carbon black or silica as filler is reduced to improve fuel economy, then fuel economy is improved, but the strength of the tread rubber is reduced, resulting in deteriorated chipping resistance and abrasion resistance
Solution Approach 1:
The patent applies parameter changes by establishing specific quantitative relationships between rubber components and fillers. Relationship (1) requires isoprene-based rubber content to exceed styrene-butadiene rubber content, relationship (2) requires isoprene-based rubber content to exceed polybutadiene rubber content, and relationship (3) requires silica content to be greater than or equal to carbon black content. These parameter constraints optimize the balance between fuel economy and tread strength
Solution Approach 2:
The patent uses composite materials by combining multiple rubber components (isoprene-based rubber, polybutadiene rubber, styrene-butadiene rubber) with fillers (silica and carbon black) in specific proportions. This composite approach allows the tread rubber to achieve both reduced filler content for fuel economy and maintained strength through optimized material composition
2Use of energy by moving object
If the amount of carbon black or silica as filler is reduced to improve fuel economy, then fuel economy is improved, but abrasion resistance is reduced
Solution Approach 1:
The patent applies parameter changes by establishing specific quantitative relationships between rubber components and fillers. Relationship (1) requires isoprene-based rubber content to exceed styrene-butadiene rubber content, relationship (2) requires isoprene-based rubber content to exceed polybutadiene rubber content, and relationship (3) requires silica content to be greater than or equal to carbon black content. These parameter constraints optimize the balance between fuel economy and abrasion resistance
Solution Approach 2:
The patent uses composite materials by combining multiple rubber components (isoprene-based rubber, polybutadiene rubber, styrene-butadiene rubber) with fillers (silica and carbon black) in specific proportions. This composite approach allows the tread rubber to achieve both reduced filler content for fuel economy and maintained abrasion resistance through optimized material composition
3Use of energy by moving object
If the amount of carbon black or silica as filler is reduced to improve fuel economy, then fuel economy is improved, but the rigidity of the tread portion is reduced, resulting in deteriorated handling stability
Solution Approach 1:
The patent applies parameter changes by establishing specific quantitative relationships between rubber components and fillers. Relationship (1) requires isoprene-based rubber content to exceed styrene-butadiene rubber content, relationship (2) requires isoprene-based rubber content to exceed polybutadiene rubber content, and relationship (3) requires silica content to be greater than or equal to carbon black content. These parameter constraints optimize the balance between fuel economy and handling stability
Solution Approach 2:
The patent uses composite materials by combining multiple rubber components (isoprene-based rubber, polybutadiene rubber, styrene-butadiene rubber) with fillers (silica and carbon black) in specific proportions. This composite approach allows the tread rubber to achieve both reduced filler content for fuel economy and maintained rigidity for handling stability through optimized material composition
Data Source
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AI summary
Provided is a tire that provides improved overall performance in terms of fuel economy, abrasion resistance, and handling stability. Included is a tire which includes a tread including a rubber composition, the rubber composition containing rubber components including an isoprene-based rubber, a polybutadiene rubber, and a styrene-butadiene rubber, and fillers including silica and carbon black, the rubber composition satisfying the following relationships (1) to (3): (1) Isoprene-based rubber content > Styrene-butadiene rubber content; (2) Isoprene-based rubber content > Polybutadiene rubber content; and (3) Silica content ≥ Carbon black content, the tire satisfying the following relationships (4) and (5) with respect to the tan δ at 30°C of the rubber composition and the negative ratio N (%) of the tread: (4) tan δ at 30°C < 0.10; and (5) tan δ at 30°C x N < 4.0.