Tire Band Layer Layout for Flat Spot and High-Speed Durability
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Solution Overview
Problem
Existing pneumatic tires face a trade-off between flat spot resistance and high-speed durability, as reducing the number of band cords to minimize deformation leads to decreased binding force and compromised high-speed durability.
Innovation Solution
The tire design includes a belt layer and a band layer with a first layer covering the entire width and second layers positioned radially outward, with specific axial distances and configurations to reduce band cord deformation while maintaining high-speed durability, featuring a unique winding pattern and bead portion design to distribute strain effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the amount of band cords is reduced to minimize deformation, then flat spot resistance is improved, but high-speed durability is deteriorated due to decreased binding force for belt layers
Solution Approach 1:
The band layer is segmented into multiple separate second layers arranged in the tire axial direction, rather than using a continuous band layer. This segmentation allows selective placement of band cords in regions where they are most effective for preventing flat spots while reducing overall band cord quantity to maintain high-speed durability.
Solution Approach 2:
The second layers are positioned with specific axial edges at controlled distances from groove bottoms of circumferential grooves, creating local variations in band cord distribution. This local quality optimization ensures adequate binding force in critical areas while reducing band cord deformation in other areas, simultaneously improving both flat spot resistance and high-speed durability.
2Reliability
If band cords are reduced to prevent deformation under load, then flat spot resistance improves, but the binding force for belt layers decreases
Solution Approach 1:
The band layer is divided into multiple separate second layers, allowing strategic placement of band cords to maintain binding force where needed while reducing overall quantity to prevent deformation and improve flat spot resistance.
Solution Approach 2:
By controlling the axial edge positions of second layers relative to groove bottoms, the invention creates localized variations in band cord density that optimize both binding force and deformation resistance in different tire regions.
Data Source
AI summary
A pneumatic tyre includes a tread portion provided with circumferential grooves to form circumferential land portions, a belt layer, and a band layer disposed outwardly in the tyre radial direction of the belt layer. The band layer includes a first layer covering an entire width of the belt layer, and second layers disposed outwardly in the tyre radial direction of the first layer and arranged separately in a tyre axially direction from one another. Each second layer is located radially inwardly of a respective one of the circumferential land portions. In each circumferential land portion, the second layer has at least one axial edge that is away at a distance (A) of equal to or more than 3.0 mm in the tyre axial direction from a groove bottom of one of the circumferential grooves nearest to the at least one axial edge.