Multi-Layer Tire Tread Structure for Handling and Rolling Resistance
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Solution Overview
Problem
There is a conflict between optimizing lateral stiffness for improved handling characteristics and reducing rolling resistance in vehicle tire treads, particularly in sports tires, as using stiffer rubber compounds in the shoulder areas increases rolling resistance.
Innovation Solution
A multi-layered tread design is implemented, where low rolling resistance rubber materials with a low modulus of elasticity are used in the shoulder areas, and a central section with a higher modulus of elasticity is stabilized by a hard base, forming a composite structure with specific ratios of elasticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a stiffer rubber compound with high modulus of elasticity is used in the shoulder areas of the tread, then the lateral stiffness and rolling characteristics are improved, but the rolling resistance increases
Solution Approach 1:
The tread is divided into multiple functional zones with different rubber compounds: shoulder areas (first and second regions) use softer compound for low rolling resistance, while the central area (third region) uses stiffer compound for lateral stability. This segmentation allows each zone to be optimized for its specific function rather than using a uniform compound throughout.
Solution Approach 2:
Different regions of the tread are assigned different material properties tailored to their specific requirements. The shoulder regions use softer rubber (lower modulus of elasticity) to reduce rolling resistance, while the central region uses stiffer rubber (higher modulus of elasticity) to maintain lateral stiffness for handling. This local differentiation of material quality resolves the contradiction between overall stiffness and localized energy loss.
2Loss of energy
If a softer rubber compound with low modulus of elasticity is used in the tread area, then the rolling resistance is reduced, but the lateral stiffness deteriorates
Solution Approach 1:
The tread is divided into multiple functional zones with different rubber compounds: shoulder areas (first and second regions) use softer compound for low rolling resistance, while the central area (third region) uses stiffer compound for lateral stability. This segmentation allows each zone to be optimized for its specific function rather than using a uniform compound throughout.
Solution Approach 2:
Different regions of the tread are assigned different material properties tailored to their specific requirements. The shoulder regions use softer rubber (lower modulus of elasticity) to reduce rolling resistance, while the central region uses stiffer rubber (higher modulus of elasticity) to maintain lateral stiffness for handling. This local differentiation of material quality resolves the contradiction between overall stiffness and localized energy loss.
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 multi-layered tread achieves excellent handling properties with reduced rolling resistance, improving cornering characteristics and fuel efficiency.
Implementation Method 1
the first rubber material has a higher modulus of elasticity than the fourth rubber material, and wherein the fourth rubber material has a higher modulus of elasticity than the second rubber material and the third rubber material
Data Source
Figure 1
AI summary
The invention relates to a multi-layer tread for use in vehicle tyres, comprising: a) a base layer comprising a first rubber material, and b) a top layer disposed on the base layer and connected to the base layer, wherein the top layer comprises: i) a first lateral region comprising a second rubber material, ii) a second lateral region comprising a third rubber material, and iii) a central region disposed between the first lateral region and the second lateral region and comprising a fourth rubber material, wherein the first rubber material has a higher modulus of elasticity than the fourth rubber material, and wherein the fourth rubber material has a higher modulus of elasticity than the second rubber material and the third rubber material.