Silica-SBR Tread Composition for High-Speed Steering Stability
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Solution Overview
Problem
Conventional tire technologies fail to provide sufficient steering stability during high-speed running, despite advancements in grip performance.
Innovation Solution
A tire design featuring a tread portion with a cap rubber layer composed of 40-60 parts by mass styrene-butadiene rubber (SBR) and 100 parts by mass silica, along with a thickness of 8.5 mm or less, which forms widely distributed SBR-silica domains for improved grip and heat generation, enhancing steering stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional rubber compositions and tread thickness are used to improve grip performance, then steering stability at low speeds is improved, but steering stability during high-speed running remains insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the SBR content (40-60 parts by mass per 100 parts rubber component) and silica content (100 parts by mass per 100 parts rubber component), and by limiting the tread portion thickness to 8.5 mm or less. These specific parameter ranges optimize the balance between grip performance and high-speed steering stability, resolving the contradiction between low-speed grip and high-speed stability.
Solution Approach 2:
The patent uses composite materials by combining SBR with silica in specific proportions within the cap rubber layer. This composite structure creates widely distributed SBR-silica domains that provide both adhesion for grip performance and structural integrity for high-speed steering stability, addressing the contradiction between softness for grip and rigidity for stability.
2Force
If the tread portion thickness is increased to improve grip performance, then adhesion to the road surface is enhanced, but responsiveness and steering stability during high-speed running deteriorate
Solution Approach 1:
The patent applies parameter changes by setting the tread portion thickness to 8.5 mm or less, which is a critical threshold. This parameter optimization ensures that frictional forces can be effectively transmitted from the road surface to the tire structure while maintaining sufficient responsiveness during high-speed running, resolving the contradiction between force transmission and speed responsiveness.
3Reliability
If the SBR content is increased to improve grip performance, then adhesion is enhanced, but heat generation and steering stability during high-speed running are adversely affected
Solution Approach 1:
The patent applies parameter changes by precisely controlling the SBR content within 40-60 parts by mass per 100 parts rubber component. This optimized range provides sufficient adhesion for grip performance while limiting excessive heat generation during high-speed running, resolving the contradiction between grip and thermal management.
Solution Approach 2:
The patent uses composite materials by combining SBR with silica in specific proportions. This composite structure creates widely distributed SBR-silica domains that provide both adhesion for grip performance and thermal management properties, reducing heat generation during high-speed running while maintaining grip.
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 tire achieves improved steering stability and grip performance at high speeds by effectively transmitting frictional forces and maintaining road contact, even under demanding conditions.
Implementation Method 1
effectively transmitting frictional forces
Data Source
AI summary
Provided is a tire which improves steering stability during highspeed running and the tire has a tread portion, wherein the cap rubber layer forming the tread portion is formed from a rubber composition containing 40 parts by mass or more and 60 parts by mass or less of styrene-butadiene rubber (SBR) with a styrene content of 25% by mass or less in 100 parts by mass of the rubber component, and 100 parts by mass or more of silica with respect to 100 parts by mass of the rubber component; and the tread portion has a thickness of 8.5 mm or less.