Multi-Layer Tire Tread Rubber for Steering Stability
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Solution Overview
Problem
Tires with tread rubber made from rubbers of different elastic moduli experience uneven ground pressure, leading to reduced steering stability due to deformation differences during travel.
Innovation Solution
A tire design featuring a multi-layer tread rubber structure with specific joint configurations and elastic modulus combinations, where the second layer has a greater elastic modulus than the first layer, and optionally a third layer, to minimize rigidity differences and even out ground pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If rubbers having different elastic modulus are used in the tread rubber, then the tire can achieve desired performance characteristics, but the deformation difference between rubber regions increases leading to uneven ground pressure and reduced steering stability
Solution Approach 1:
The tread rubber is divided into multiple layers (first layer and second layer) with different rubber compositions. The first layer contains rubbers with different elastic moduli for performance optimization, while the second layer provides a unifying high elastic modulus structure that balances the deformation characteristics across the tread, thereby resolving the contradiction between performance adaptability and steering stability.
Solution Approach 2:
The patent uses composite rubber materials with different elastic moduli in specific layers. The first layer combines rubbers with different elastic properties to achieve desired performance characteristics, while the second layer uses a high elastic modulus rubber to provide structural balance and reduce overall deformation differences, thus maintaining steering stability despite using diverse rubber compositions.
2Reliability
If a multi-layer tread rubber structure with different elastic moduli is used, then ground pressure distribution can be optimized, but the structural complexity of the tread rubber increases
Solution Approach 1:
Different layers of the tread rubber are assigned different rubber compositions with specific elastic modulus characteristics tailored to their functional requirements. The first layer uses rubbers with varying elastic moduli for localized performance optimization, while the second layer uses high elastic modulus rubber for structural integrity, achieving reliable ground pressure distribution through localized material properties rather than uniform complexity throughout.
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 design effectively inhibits uneven ground pressure and improves steering stability by reducing deformation differences and enhancing the elastic deformation of the tread rubber, ensuring consistent contact with the road surface.
Implementation Method 1
the second layer is formed by a rubber having a greater elastic modulus than an elastic modulus of at least one of the rubbers constructing the first layer
Data Source
AI summary
In a tire, a tread rubber includes a first layer which is grounded on a road surface in an outer peripheral surface thereof, and a second layer which is joined to an inner peripheral surface of the first layer in an outer peripheral surface thereof, the first layer includes a joint portion where rubbers having different elastic modulus are joined, and the second layer is formed by a rubber having a greater elastic modulus than an elastic modulus of at least one of the rubbers constructing the first layer.