Tire Tread Rubber Composition for Uneven-Ground Wear Resistance
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Solution Overview
Problem
Conventional tires exhibit insufficient wear resistance performance when running on uneven ground.
Innovation Solution
A tire design with a tread portion comprising styrene-butadiene rubber (SBR), isoprene-based rubber, and silica, where SBR content is 40-60 parts by mass, isoprene-based rubber content is over 30 parts by mass, silica content is 60 parts by mass or less, and tread thickness is 9.4 mm or less, along with specific compounding materials to enhance wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tread portion thickness is increased to improve wear resistance, then wear resistance improves, but fuel consumption increases and handling performance deteriorates
Solution Approach 1:
The patent optimizes the tread thickness parameter to 9.4mm or less, balancing wear resistance with fuel efficiency and handling performance. This parameter change resolves the contradiction by finding the optimal thickness value that provides sufficient durability while minimizing energy consumption and maintaining responsive handling characteristics.
2Reliability
If silica content is increased to improve wear resistance, then wear resistance improves, but heat generation increases causing brittle fracture
Solution Approach 1:
The patent uses a composite rubber composition containing SBR (40-60 parts), isoprene-based rubber (30+ parts), and silica (60 parts or less). This composite material approach combines materials with complementary properties: SBR provides wear resistance, isoprene rubber provides elasticity and heat resistance, and silica enhances reinforcement. The synergistic combination resolves the contradiction by achieving wear resistance without excessive heat generation or brittleness.
3Reliability
If SBR content is increased to improve wear resistance, then wear resistance improves, but heat generation increases
Solution Approach 1:
The patent optimizes the SBR content to 40-60 parts per 100 parts of rubber component, representing a parameter change that balances wear resistance with heat generation control. This optimized range provides sufficient wear resistance while limiting excessive heat buildup that would occur with higher SBR concentrations.
Solution Approach 2:
The patent combines SBR with isoprene-based rubber in a composite formulation where SBR (40-60 parts) provides wear resistance and isoprene rubber (30+ parts) provides heat resistance and elasticity. This composite material strategy resolves the contradiction by distributing functional requirements across multiple materials, achieving wear resistance without prohibitive heat generation.
Data Source
AI summary
A tire having a tread portion which can improve wear resistance performance when running on uneven ground, wherein the cap rubber layer forming the tread portion contains styrene-butadiene rubber (SBR), isoprene-based rubber, and silica; the content of the styrene-butadiene rubber (SBR) in 100 parts by mass of the rubber component is 40 parts by mass or more and 60 parts by mass or less, and the styrene content of the styrene-butadiene rubber (SBR) is 25% by mass or less; the content of the isoprene-based rubber in 100 parts by mass of the rubber component is more than 30 parts by mass; the content of the silica with respect to 100 parts by mass of the rubber component is 60 parts by mass or less; and the thickness of the tread portion is 9.4 mm or less.