Heavy-Duty Tire Tread Composition for Handling Stability on Ice
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Solution Overview
Problem
Heavy duty tires lack sufficient response and handling stability on icy roads due to insufficient reaction force generation on smooth surfaces, despite previous attempts to improve ice braking performance with specific rubber compositions.
Innovation Solution
A heavy duty tire tread composition containing styrene-butadiene rubber, carbon black, and silica, with a specific ratio of sipes to surface area, enhancing grip and force transmission on icy surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If natural rubber/polybutadiene rubber composition is used to soften the rubber surface at low temperatures, then the conformity of the rubber surface is improved, but the reaction force generated on smooth icy roads is insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the rubber by incorporating styrene-butadiene rubber with specific styrene content (20-40%) and controlling the ratio of natural rubber to polybutadiene rubber. This parameter adjustment allows the rubber to maintain both surface conformity and generate sufficient reaction force on smooth icy surfaces.
Solution Approach 2:
The patent creates a composite rubber composition combining four different rubber types (natural rubber, polybutadiene rubber, styrene-butadiene rubber, and isoprene rubber) with specific content ratios. This composite material approach synergistically combines the advantages of each rubber type to achieve both surface conformity and adequate reaction force generation on ice.
2Stability of the object's composition
If the tread rubber is softened to improve grip on ice, then the conformity improves, but the force transmission capability decreases
Solution Approach 1:
The patent optimizes the molecular structure parameters of the rubber by selecting specific vinyl content ranges for polybutadiene rubber (30-90%) and styrene content for SBR (20-40%). These parameter changes enable the rubber to maintain appropriate softness for surface conformity while preserving force transmission capability through optimized molecular chain flexibility.
Solution Approach 2:
The patent creates different local properties within the rubber composition by combining rubbers with different characteristics. The natural rubber provides elasticity and force transmission, while the polybutadiene and SBR components provide surface softness and conformity. This local quality differentiation within the composite material resolves the contradiction between softness and force transmission.
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 handling stability and grip on ice by forming styrene microdomains and reinforcing the SBR phase with carbon black, allowing for greater deformation and reaction force transmission.
Implementation Method 1
SBR is contained in the rubber components to form hard styrene microdomains in the rubber layer
Implementation Method 2
carbon black reinforces the SBR phase to permit greater force to occur within the SBR phase
Implementation Method 3
it is possible to reduce the tan δ at high temperatures while enhancing the tan δ at low temperatures
Data Source
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AI summary
Provided is a heavy duty tire having excellent response (handling stability) on ice. A heavy duty tire includes a tread (2) containing one or more rubber components including a styrene-butadiene rubber, carbon black, and silica, the tread having a plurality of sipes (12, 15, 30, 36, 40, 52), the tread satisfying the following relationship (1): A × B ≥ 40 wherein A represents the styrene-butadiene rubber content (% by mass) based on 100% by mass of the rubber components, and B represents the ratio (mm-1) of the lateral direction components of the sipes (12, 15, 30, 36, 40, 52) to the surface area of the tread.