Heavy-Load Tire Tread Structure for Wear and Heat Resistance
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Solution Overview
Problem
Conventional heavy-duty tires face a trade-off between wear resistance and heat resistance, making it difficult to achieve both performance characteristics simultaneously.
Innovation Solution
The tire design incorporates a cap layer with a cap surface layer and cap intermediate layer in the tread rubber, where the cap surface layer has a higher tan δ under specific conditions than the cap intermediate layer, ensuring a difference of 0.06 or more, enhancing wear resistance and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If tread rubber uses a cap layer and base layer configuration, then wear resistance is improved, but heat resistance deteriorates
Solution Approach 1:
The cap layer is divided into two distinct layers: a cap surface layer with higher tan δ (≥0.06 difference) for wear resistance, and a cap intermediate layer with lower tan δ for heat resistance. This segmentation allows each sub-layer to optimize for its specific function, resolving the contradiction between wear resistance and heat resistance that plagues conventional single-layer cap structures.
Solution Approach 2:
Different regions of the cap layer are assigned different material properties: the cap surface layer uses rubber composition optimized for wear resistance (higher tan δ), while the cap intermediate layer uses rubber composition optimized for heat resistance (lower tan δ). This local differentiation of material properties enables simultaneous achievement of both wear resistance and heat resistance without compromise.
2Strength
If cap surface layer has higher tan δ for wear resistance, then wear resistance is improved, but heat generation increases
Solution Approach 1:
The cap layer is segmented into a wear-resistant surface layer and a heat-dissipating intermediate layer. The surface layer maintains higher tan δ for wear resistance, while the intermediate layer has lower tan δ to minimize heat generation during operation, thus resolving the energy loss contradiction.
Solution Approach 2:
The cap intermediate layer acts as an intermediary between the wear-resistant surface layer and the base layer. It mediates the thermal energy generated during operation, reducing heat transmission to the base layer and overall tire structure, thereby reducing total heat generation and 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
This configuration achieves a higher level of compatibility between wear resistance and heat resistance, extending the tire's durability and performance.
Implementation Method 1
the cap surface layer has a larger tan δ in a tensile test under conditions of: room temperature of 24° C., amplitude of 2%, and 50 Hz, than the cap intermediate layer
Data Source
AI summary
The provided is a heavy-duty tire 1, wherein tread rubber 7 has: a cap layer 7c; and a base layer 7b disposed on an inner circumferential side of tire than the cap layer, the cap layer comprises: a cap surface layer 7c1; and a cap intermediate layer 7c2, the cap surface layer has a larger tan δ in a tensile test under conditions of: room temperature of 24° C., amplitude of 2%, and 50 Hz, than the cap intermediate layer, and difference between tan δ of the cap surface layer in a tensile test under conditions of: room temperature of 24° C., amplitude of 2%, and 50 Hz, and tan δ of the cap intermediate layer in a tensile test under conditions of: room temperature of 24° C., amplitude of 2%, and 50 Hz, is 0.06 or more.