Two-Layer Tire Tread Composition for High-Speed Steering Stability
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Solution Overview
Problem
Existing tires lack sufficient steering stability, particularly during high-speed running, despite efforts to improve heat generation and rubber rigidity through the use of chitin and chitosan fibers.
Innovation Solution
A tire design featuring a tread part with two layers, where the first layer has a higher ratio of vulcanized rubber particle domain area and a thicker thickness compared to the second layer, optimizing the distribution and frictional properties to enhance grip and force transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If chitin fibers and/or chitosan fibers are compounded in a base rubber constituting a tread part, then heat generation is reduced and rigidity of rubber is increased, but steering stability is not sufficiently improved
Solution Approach 1:
The invention applies local quality by creating a two-layer tread structure where the first layer (tread surface) and second layer (inner side) have different vulcanized rubber particle domain area ratios. The first layer has R1 > 0.05 and 0.50 or less, while the second layer has R2 = 0.05 or more and less than 0.50, with R1 > R2. This spatial differentiation of material properties in the tread part enables optimized steering stability while maintaining heat reduction benefits.
Solution Approach 2:
The invention uses composite materials by combining rubber component with vulcanized rubber particles in specific proportions within each layer. The tread part comprises a composite structure with controlled domain area ratios of vulcanized rubber particles, creating a multi-phase composite material system that achieves both heat management and steering stability.
2Reliability
If vulcanized rubber powder is added to cap rubber layer and base rubber layer, then steering stability is improved, but the distribution and thickness optimization are insufficient
Solution Approach 1:
The invention segments the tread part into two distinct layers: a first layer constituting the tread surface and a second layer on the inner side. Each layer has specifically controlled vulcanized rubber particle domain area ratios (R1 for first layer, R2 for second layer), creating a segmented structure that optimizes steering stability through differentiated material distribution.
Solution Approach 2:
The invention applies parameter changes by precisely controlling the domain area ratio of vulcanized rubber particles in each layer (R1 > R2), where R1 is greater than 0.05 and 0.50 or less, and R2 is 0.05 or more and less than 0.50. This parameter optimization enables enhanced steering stability while maintaining manageable structural complexity.
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 design improves steering stability by ensuring effective friction and force transmission, enhancing on-ice grip performance and stability during high-speed running.
Implementation Method 1
due to friction at an interface between the vulcanized rubber particle and a rubber matrix, heat is generated
Implementation Method 2
playing a role in transmitting a force (grip force) generated by friction on the tread surface to the inside of the tire
Data Source
Figure 1
AI summary
Provided is a tire comprising a tread part, wherein the tread part has a first layer (6) constituting a tread surface and a second layer (7), wherein the first layer and the second layer are each composed of a rubber composition comprising a rubber component and a vulcanized rubber particle, wherein, in a cut section parallel to the tread surface of the first layer, a ratio R1 of a domain area derived from the vulcanized rubber particle to an area of the entire cut section is greater than 0.05 and 0.50 or less, wherein, in a cut section parallel to a tread surface of the second layer, a ratio R2 of a domain area derived from the vulcanized rubber particle to an area of the entire cut section is 0.05 or more and less than 0.50, and wherein R1 is larger than R2.