Dual-Layer Tire Tread for Balanced Cornering Performance
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Solution Overview
Problem
Tires face challenges in maintaining excellent cornering performance throughout the initial and middle to later stages of running, with existing tires struggling to balance high land ratio for grip and initial stage cornering performance.
Innovation Solution
A tire design featuring a tread with a land ratio of 70% or higher, a cap tread with an average loss tangent of 0.10 or more over 30-100°C, and a base tread with an average loss tangent of less than 0.05, optimizing cornering performance by adjusting viscoelastic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the land ratio is increased to improve grip performance and cornering stability during middle and later stages of running, then the cornering performance during initial stage of running deteriorates due to insufficient viscoelastic properties for initial grip
Solution Approach 1:
The tread is divided into two distinct layers with different viscoelastic properties: the cap tread layer with higher loss tangent (0.05 or more) for initial grip, and the base tread layer with lower loss tangent (0.02 or less) for sustained stability. This local differentiation allows each layer to optimize for its specific functional requirement.
Solution Approach 2:
The tread uses a composite structure combining two rubber compositions with contrasting viscoelastic characteristics. The cap tread uses a composition optimized for initial adhesion (higher tan δ), while the base tread uses a composition for long-term stability (lower tan δ), creating a synergistic composite tread system.
2Reliability
If the land ratio is increased to 70% or higher to improve overall grip performance, then the balance between initial stage and middle/later stage cornering performance cannot be achieved
Solution Approach 1:
Different regions of the tread (cap vs. base layer) are assigned different loss tangent values to address the balance problem. The cap layer compensates for initial grip needs while the base layer ensures long-term stability, allowing the high land ratio design to achieve both initial and sustained cornering performance.
Solution Approach 2:
The invention changes the viscoelastic parameter (loss tangent) distribution within the tread structure. By setting specific loss tangent ranges for cap tread (≥0.05) and base tread (≤0.02), the system optimizes the balance between initial and middle/later stage cornering performance while maintaining high land ratio.
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 achieves improved cornering performance during both initial and middle to later stages of running, balancing grip and stability through targeted viscoelastic adjustments in the cap and base treads.
Implementation Method 1
the cap tread having an average loss tangent over 30-100°C of 0.10 or more, the base tread having an average loss tangent over 30-100°C of less than 0.05
Data Source
Figure 1
AI summary
Provided is a tire excellent in overall performance in terms of cornering performance during the initial stage of running and during the middle and later stages of running. The present disclosure relates to a tire including a tread including a cap tread and a base tread, the tread having a land ratio of 70% or higher, the cap tread having an average loss tangent over 30-100°C of 0.10 or more, the base tread having an average loss tangent over 30-100°C of less than 0.05.