Tire Tread Rubber Modulus and Loss Tangent Relationship
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Solution Overview
Problem
Tires using resin materials in the tire frame or reinforcement layer face challenges with high-speed durability due to softening at high temperatures, leading to inadequate performance during high-speed running.
Innovation Solution
A tire design with a tread rubber that satisfies specific storage modulus and loss tangent relationships, combined with a resin composition in the reinforcement layer, enhances high-speed durability while maintaining weight reduction and recyclability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If resin material is used in tire frame or reinforcement layer, then weight is reduced and recyclability is improved, but high-speed durability deteriorates due to softening at high temperatures
Solution Approach 1:
The patent uses a composite structure where a resin-coated reinforcement layer (combining resin materials with reinforcement members) is positioned between the tire frame and tread rubber. This composite approach allows the tire to maintain the weight reduction and recyclability benefits of resin materials while the reinforcement members provide structural integrity and heat resistance during high-speed running, preventing the softening issue that would otherwise occur with pure resin materials.
2Reliability
If tread rubber with excellent low loss property is adopted, then high-speed durability is improved, but storage modulus decreases and strain of tread and tire members increases
Solution Approach 1:
The patent applies local quality by creating a resin-coated reinforcement layer at the specific location between the tire frame and tread rubber. This localized reinforcement provides additional structural support and heat resistance exactly where needed during high-speed running, allowing the tread rubber to maintain its excellent low loss properties without compromising overall tire strength. The reinforcement layer compensates for the reduced storage modulus of the tread rubber in a targeted manner.
Data Source
Figure 1
AI summary
Provided is a tire that has excellent high-speed durability even though a resin material is used therein. The tire includes a tire frame (10) having an annular shape, a reinforcement layer (20) located outward of the tire frame (10) in a tire radial direction, and tread rubber (30) located outward of the reinforcement layer (20) in the tire radial direction. The reinforcement layer (20) includes a reinforcement member (21) that is coated with a resin composition containing from 50 mass% to 100 mass% of a resin material. The tread rubber (30) has a loss tangent (tan δ60°C) during 1% strain at 60°C and a storage modulus (E'30°C (MPa)) during 1% strain at 30°C that satisfy a relationship in a formula: 27.5 × tan δ60°C + 1.125 ≤ E'30°C ≤ 27.5 × tan δ60°C + 11.25.