Heavy-Load Tire Tread Compound Balance for Fuel Efficiency and Rib Tear
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for improving tire performance, such as micronizing carbon black, are insufficient for enhancing fuel efficiency and rib tear resistance, and can lead to deteriorated dispersibility and abrasion resistance.
Innovation Solution
A pneumatic tire design with a cap rubber layer and a base rubber layer, where the modulus difference at 200% elongation between the two layers is set within a specific range, and the acetone extraction amount of the base rubber layer is less than 4.0% by mass, optimizing the modulus balance and improving rib tear resistance while maintaining fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If carbon black is micronized or made high structure to improve breaking strength, then tire strength is improved, but dispersibility deteriorates and abrasion resistance may deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the rubber compound by controlling acetone extraction amount (less than 4.0% by mass) and the difference in modulus at 200% elongation between base and cap rubber layers (5 MPa or less). This approach improves breaking strength while maintaining dispersibility and abrasion resistance, avoiding the need for carbon black micronization.
2Strength
If conventional carbon black improvement methods are used, then breaking strength is improved, but fuel efficiency improvement is insufficient
Solution Approach 1:
The patent optimizes the rubber compound parameters (acetone extraction amount and modulus difference) to achieve a balance between breaking strength and fuel efficiency. By controlling the modulus difference between base and cap rubber layers to be 5 MPa or less, the patent reduces rolling resistance and improves fuel efficiency while maintaining adequate breaking strength.
3Strength
If the modulus difference between base rubber layer and cap rubber layer is large, then rib tear resistance may be improved, but fuel efficiency deteriorates
Solution Approach 1:
The patent precisely controls the modulus difference between base and cap rubber layers to be 5 MPa or less. This parameter optimization ensures that the tire has sufficient rib tear resistance while minimizing rolling resistance to improve fuel efficiency, resolving the trade-off between these two performance aspects.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Provided is a pneumatic tire for heavy load having improved fuel efficiency and rib tear resistance, the pneumatic tire (1) for heavy load comprising a tread (6), wherein the pneumatic tire has a difference in modulus at 200% elongation between a base rubber layer (4) and a cap rubber layer (5) set within a predetermined range and an acetone extraction amount of the base rubber layer (4) is set within a predetermined range.