High-Angle Inclined Belt Tire Cornering Power
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Solution Overview
Problem
Pneumatic tires with inclined belt layers struggle to maintain cornering power across various driving conditions, particularly at small slip angles, where the increase in cornering power is less significant compared to larger slip angles.
Innovation Solution
The tire design incorporates high-angle and low-angle inclined belt layers with specific inclination angles and positioning relative to the tire circumferential direction, combined with a circumferential belt structure that enhances rigidity and noise performance, ensuring increased cornering power and durability across varying slip angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the cords in the inclined belt layer are greatly inclined relative to the tire circumferential direction to increase cornering power under large slip angle conditions, then cornering power at large slip angles is improved, but cornering power at small slip angles increases less significantly
Solution Approach 1:
The inclined belt is divided into multiple inclined belt layers with different cord inclination angles. Specifically, it includes a first inclined belt layer with cords at 30° or more to 90° or less relative to the tire circumferential direction, and a second inclined belt layer with cords at less than 30° to more than 0° relative to the tire circumferential direction. This segmentation allows different layers to contribute to cornering power under different slip angle conditions, resolving the contradiction between optimizing for large slip angles versus maintaining performance across various slip angles.
Solution Approach 2:
Different regions of the inclined belt have different cord inclination angles tailored to specific functional requirements. The first inclined belt layer with steeper angles provides rigidity and cornering power for large slip angle conditions, while the second inclined belt layer with shallower angles contributes to cornering power at small slip angles. This local differentiation of quality (inclination angle) allows the belt structure to adapt to varying operational conditions.
2Stability of the object's composition
If the rigidity of the inclined belt layer in the tire width direction is increased by steeply inclining the cords to improve cornering power, then steering stability is improved, but the complexity of the belt structure increases
Solution Approach 1:
The inclined belt is segmented into multiple layers with different inclination angles rather than using a single layer with extreme inclination. This segmentation achieves the desired steering stability through the combined effect of multiple layers, each contributing differently, rather than relying on a single complex steeply-inclined layer, thereby managing structural complexity.
Solution Approach 2:
The multi-layer inclined belt structure serves multiple functions simultaneously: the first inclined belt layer provides rigidity for large slip angle conditions, while the second inclined belt layer contributes to small slip angle performance. This multi-functionality allows the belt structure to achieve comprehensive steering stability across various driving conditions without requiring excessive complexity in any single layer.
Data Source
AI summary
A pneumatic tire includes a tread portion, carcass, inclined belt, and circumferential belt. The inclined belt is formed by inclined belt layer(s) including cords inclined relative to the tire circumferential direction. A circumferential main groove is provided in the tread portion. The inclined belt includes a high-angle inclined belt layer in which the cords are at an inclination angle of 35° to 90° relative to the tire circumferential direction. In at least one tread half portion, an edge of the high-angle inclined belt layer in the tire width direction is positioned further outward in the tire width direction than the circumferential main groove disposed furthest outward in the tire width direction. The interval in the tire width direction from the edge to the center of the circumferential main groove is 0.2W1 to 0.35W1, where W1 is the width of the high-angle inclined belt layer in the tire width direction.