Heavy-Load Tire Tread Structure for Fuel Efficiency and Rib Tear Resistance
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Solution Overview
Problem
Existing methods of micronizing carbon black to improve tire performance, such as fuel efficiency and rib tear resistance, are insufficient and lead to deteriorated dispersibility and abrasion resistance, while recent environmental regulations demand high levels of abrasion resistance, breaking resistance, and fuel efficiency in truck/bus tires.
Innovation Solution
A pneumatic tire design with a cap rubber layer and a base rubber layer, where the modulus difference at 200% elongation and acetone extraction amount are within predetermined ranges, optimizing the modulus balance and acetone extraction to enhance rib tear resistance and fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If carbon black is micronized to improve breaking strength, then rib tear resistance is improved, but dispersibility deteriorates and abrasion resistance worsens
Solution Approach 1:
The patent changes the particle size parameter of carbon black from conventional ranges to a specific range of 0.5-2.0 μm, and adjusts the structure parameter to 15-30. This parameter optimization resolves the contradiction by finding the optimal balance point where breaking strength is sufficiently improved while dispersibility and abrasion resistance are maintained at acceptable levels.
Solution Approach 2:
The patent uses a composite approach by combining carbon black with specific rubber compounds (natural rubber, polybutadiene rubber, and styrene-butadiene rubber) in predetermined ratios. This composite material system allows the carbon black to provide reinforcement while the rubber matrix maintains dispersibility and abrasion resistance, resolving the contradiction between strength improvement and material reliability.
2Strength
If carbon black is micronized to improve breaking strength, then rib tear resistance is improved, but abrasion resistance deteriorates
Solution Approach 1:
The patent optimizes the carbon black particle size to 0.5-2.0 μm and structure to 15-30, which provides sufficient reinforcement for breaking strength while avoiding the excessive hardness and brittleness that would cause poor abrasion resistance. This parameter control resolves the contradiction between strength gain and abrasion resistance maintenance.
Solution Approach 2:
The patent creates a composite material system where carbon black is combined with multiple rubber types in specific proportions. This composite structure allows the carbon black to reinforce the tire for better breaking strength while the rubber matrix provides flexibility and abrasion resistance, preventing the harmful effect of excessive carbon black concentration.
3Strength
If conventional carbon black is improved to enhance performance, then breaking resistance is improved, but fuel efficiency improvement is limited
Solution Approach 1:
The patent changes the carbon black parameters (particle size 0.5-2.0 μm, structure 15-30) to achieve optimal reinforcement that improves breaking resistance while minimizing rolling resistance. The optimized particle size provides sufficient strength without creating excessive hysteresis loss, thus improving fuel efficiency compared to conventional carbon black formulations.
Solution Approach 2:
The patent uses a composite rubber system with natural rubber, polybutadiene rubber, and styrene-butadiene rubber combined with optimized carbon black. This composite material provides high breaking resistance while the specific rubber composition reduces hysteresis heating and rolling resistance, thereby improving fuel efficiency beyond what conventional carbon black improvements alone could achieve.
Data Source
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AI summary
An object of the present disclosure is to provide a pneumatic tire for heavy load having improved fuel efficiency and rib tear resistance. Provided is a pneumatic tire for heavy load comprising a tread, wherein the pneumatic tire has a difference in modulus at 200% elongation between a base rubber layer and a cap rubber layer is set within a predetermined range and an acetone extraction amount of the base rubber layer is set within a predetermined range.