Tire Tread Rubber With Multi-Layer Elastic Modulus Segmentation
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Solution Overview
Problem
Tires with tread rubber formed from two different kinds of rubber struggle to achieve sufficient elastic deformation at low temperatures, leading to inadequate edge effect and grip on the road surface.
Innovation Solution
A tire design featuring tread rubber with multiple layers of rubber having different elastic moduli, where the outer layer has a smaller total area of peripheral joint portions and the inner layer has a greater area, with the ground end portion formed by the rubber with the highest elastic modulus, and spirally wound ribbon rubbers to enhance temperature increase and grip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the tread rubber is formed by two different kinds of rubber, then the edge effect is achieved, but the temperature of the tread rubber cannot be raised sufficiently at an early stage of operation
Solution Approach 1:
The tread rubber is divided into multiple layers with different rubber compositions. The first layer (contacting road surface) uses rubber with high hysteresis loss to generate heat, while the second layer uses rubber with different properties. This segmentation allows different parts of the tread to perform different functions, with the first layer specifically designed to raise temperature quickly at an early stage of operation.
Solution Approach 2:
Different layers of the tread rubber are assigned different rubber compositions with specific properties. The first layer has high hysteresis loss for heat generation, while the second layer has different characteristics. This local differentiation of material properties enables the tread to achieve both quick temperature rise and sustained edge effect performance.
2Reliability
If the tread rubber does not sufficiently ground on the road surface, then the edge effect cannot be achieved, but this occurs when the temperature of the tread rubber is low
Solution Approach 1:
The tread rubber is segmented into multiple layers where the first layer (contacting road surface) is specifically designed with high hysteresis loss rubber to generate heat quickly. This ensures that even at an early stage of operation when overall temperature is low, the contact layer can generate sufficient heat to maintain good grounding and achieve the edge effect.
Solution Approach 2:
The rubber composition parameters are changed across different layers. The first layer uses rubber with high hysteresis loss to generate heat, while the second layer uses rubber with different properties. This parameter differentiation ensures that the tread rubber can ground sufficiently on the road surface even when the overall temperature is low, by having the contact layer generate heat locally.
3Temperature
If multiple layers of rubber with different elastic modulus are used, then temperature increase is improved, but the structure becomes more complex
Solution Approach 1:
The tread rubber is divided into a small number of layers (first layer and second layer) with different rubber compositions. This segmentation into just two main layers simplifies the manufacturing process while still achieving the temperature increase benefit through the high hysteresis loss property of the first layer.
Solution Approach 2:
Instead of using many layers with gradually changing properties, the invention uses just two layers with distinct rubber compositions. The first layer has high hysteresis loss for heat generation, while the second layer has different properties. This localized differentiation into only two layers reduces structural complexity compared to using multiple gradual transitions.
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 raises the temperature of the tread rubber early in operation, ensuring sufficient deformation and improved grip, stability, and braking performance on dry surfaces while minimizing rolling resistance.
Implementation Method 1
the tread rubber is provided with peripheral joint portions where the plurality kinds of rubber having the different elastic modulus is joined in a tire peripheral direction
Implementation Method 2
the plurality kinds of rubber having the different elastic modulus is joined
Data Source
AI summary
A tire includes a tread rubber which is formed by a plurality kinds of rubber having different elastic modulus, the tread rubber is provided with peripheral joint portions where the plurality kinds of rubber having the different elastic modulus is joined in a tire peripheral direction, and a ground end portion of an outside surface of the tread rubber in a tire width direction is formed by the rubber having the greatest elastic modulus among the plurality kinds of rubber constructing the peripheral joint portions.