Motorcycle Tire Tread Rubber Composition for Wet Stability
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Solution Overview
Problem
Motorcycle tires face challenges in achieving both excellent straight running stability and turning stability on wet surfaces, as improving rigidity deteriorates road surface follow-up property, while enhancing softness for turning stability compromises straight running stability.
Innovation Solution
A tire with a tread composed of a rubber composition that balances rubber hardness (Hs) and tensile stress at 300% elongation (M300) within specific ranges, using styrene-butadiene rubber, carbon black, silica, and a silane coupling agent, to maintain both high rigidity for straight running and softness for turning, while controlling the increase in M300 relative to Hs to enhance wet road surface follow-up property.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigidity of tire is improved, then straight running stability improves, but road surface follow-up property deteriorates
Solution Approach 1:
The invention changes the physical and chemical parameters of the rubber composition by controlling rubber hardness (Hs) within 60-80 and tensile stress at 300% elongation (M300) within 2-12 MPa, with the ratio (M300-2)/(Hs-60) ≤ 0.75. This parameter optimization resolves the contradiction by achieving a balance between rigidity for straight running stability and softness for road surface follow-up property during turning.
Solution Approach 2:
The invention uses a composite rubber composition containing styrene-butadiene rubber, carbon black, silica, and silane coupling agent. This composite material structure allows simultaneous achievement of rigidity and flexibility by combining materials with complementary properties, resolving the contradiction between straight running stability and turning stability.
2Reliability
If softness of tire is improved for turning stability, then road surface follow-up property improves, but straight running stability deteriorates
Solution Approach 1:
The invention optimizes the parameters of rubber hardness and tensile stress at 300% elongation with their ratio constraint, allowing the tire to achieve appropriate softness for road surface follow-up property while maintaining sufficient rigidity for straight running stability through precise parameter control.
Data Source
AI summary
Provided is a tire for a motorcycle having an improved turning stability on wet road surface, the tire comprises a tread composed of a rubber composition, which comes into contact with a road surface, wherein Hs being a rubber hardness and M300 being a tensile stress (MPa) at 300% elongation of the rubber composition of the tread satisfy Equations 1, 2, and 3:60≤Hs≤80, Equation 1:2≤M300≤12, and Equation 2:(M300−2)/(Hs−60)≤0.75. Equation 3: