Off-Road Tire Tread Compound for Wear and Heat Balance
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Solution Overview
Problem
Pneumatic tires for off-road travel face challenges in achieving enhanced travel failure properties over poor roads, wear resistance, cut and chipping resistance, and low heat build-up, as existing solutions often result in conflicting properties where improving one aspect degrades another.
Innovation Solution
A pneumatic tire with a tread rubber composition containing 60-70 parts by mass of carbon black with a nitrogen adsorption specific surface area of 70-130 m2/g, 0.5-3 parts by mass of sulfur, and a vulcanization accelerator per 100 parts by mass of diene rubber, including 50-70% styrene-butadiene rubber, 20-30% butadiene rubber, and 10-30% natural rubber, with a glass transition temperature of −65° C. or lower, and a groove depth of 10 mm or greater at the shoulder portion for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tread rubber is made soft, then travel failure properties over poor roads and cut and chipping resistance are improved, but wear resistance and heat build-up are degraded
Solution Approach 1:
The patent applies parameter changes by precisely controlling the glass transition temperature of the diene rubber at -65°C or lower, and optimizing the filler content (60-70 parts by mass per 100 parts rubber) and sulfur content (0.5 parts by mass or greater per 100 parts rubber). These parameter adjustments enable the rubber to achieve optimal softness for travel failure resistance while maintaining wear resistance through controlled molecular mobility and crosslinking density.
2Duration of action of stationary object
If a large amount of filler with excellent wear resistance is blended, then wear resistance is enhanced, but heat build-up is degraded
Solution Approach 1:
The patent resolves this contradiction by optimizing the filler content to 60-70 parts by mass per 100 parts rubber and controlling the glass transition temperature at -65°C or lower. This parameter optimization ensures sufficient filler for wear resistance while preventing excessive heat build-up through controlled rubber-filler interaction and maintained rubber matrix flexibility.
3Temperature
If the filler is reduced in order to reduce heat build-up, then heat build-up is reduced, but wear resistance is degraded
Solution Approach 1:
The patent achieves the optimal balance by setting filler content at 60-70 parts by mass per 100 parts rubber and controlling the glass transition temperature at -65°C or lower. This parameter combination ensures adequate filler for wear resistance while preventing excessive heat build-up through optimized rubber-filler interaction and maintained rubber matrix flexibility.
4Reliability
If the groove depth of the tread rubber is increased, then travel failure properties over poor roads are improved, but manufacturing complexity and material consumption increase
Solution Approach 1:
The patent applies local quality by concentrating the groove depth increase specifically at the shoulder portions of the tread rubber, where travel failure properties are most critical. This localized approach improves off-road performance without unnecessarily increasing manufacturing complexity across the entire tread structure or excessive material consumption.
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 exhibits improved travel failure properties, wear resistance, cut and chipping resistance, and reduced heat build-up beyond conventional levels, making it suitable for off-road use in harsh environments.
Implementation Method 1
60 to 70 parts by mass of carbon black having a nitrogen adsorption specific surface area of 70 to 130 m2/g
Implementation Method 2
0.5 parts by mass or greater of sulfur, and a vulcanization accelerator per 100 parts by mass of diene rubber
Data Source
AI summary
A pneumatic tire comprises a tread rubber with a groove depth at a shoulder portion that comes into contact with a road surface of 10 mm or greater. A rubber composition of the tread rubber contains: 60 to 70 parts by mass of carbon black having a nitrogen adsorption specific surface area of 70 to 130 m2/g, 0.5 parts or greater by mass of sulfur, and a vulcanization accelerator per 100 parts by mass of diene rubber including 50 to 70 mass % of styrene-butadiene rubber, 20 to 30 mass % of butadiene rubber, and 10 to 30 mass % of natural rubber. The diene rubber has an average glass transition temperature of −65° C. or lower. A ratio of a compounded amount of the vulcanization accelerator to a compounded amount of the sulfur is 1.0 to 1.3. The tread rubber has a rubber hardness of 65 to 70 at 20° C.