Side-Reinforced Run-Flat Tire Rim Detachment Resistance
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Solution Overview
Problem
Side-reinforced run-flat radial tires with higher tire section heights face increased tire deformation and rim detachment issues during vehicle turns, leading to demanding performance requirements and a higher risk of rim detachment on the inner side.
Innovation Solution
A side-reinforced run-flat radial tire design featuring a continuous side-reinforcing rubber layer that extends across the tire equatorial plane, with specific thickness and placement configurations to enhance rim detachment resistance, including a maximum width inclined belt layer and bead fillers, which control buckling and bending stiffness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the tire section height is increased to improve riding comfort, then the tire deformation increases when a slip angle is applied, causing rim detachment on the inner side of vehicle turns
Solution Approach 1:
The side-reinforcing rubber layer is segmented into different thickness regions: a first thickness region at the equatorial plane, a second thickness region at the maximum width inclined belt layer end portions, and a third thickness region at intermediate positions. This segmentation allows different parts of the tire side portion to have optimized reinforcement levels, controlling buckling while maintaining comfort
Solution Approach 2:
The patent applies local quality by making the side-reinforcing rubber layer thickness position-dependent. The thickness is specifically controlled at the equatorial plane (first thickness), at the belt layer end portions (second thickness), and at intermediate positions (third thickness), creating localized reinforcement patterns that address specific structural needs in different regions of the tire side portion
2Duration of action of moving object
If the tire section height is increased to provide better run-flat performance, then the amount of tire deformation increases, making the performance requirements more demanding
Solution Approach 1:
The patent changes the physical parameters of the side-reinforcing rubber layer, specifically the thickness distribution. By setting the thickness at the equatorial plane to be within a specific range (0.005 to 0.02 times the tire section height) and controlling the thickness ratios between different regions, the invention optimizes the mechanical properties to meet run-flat performance requirements
3Reliability
If the side-reinforcing rubber layer thickness is increased to prevent buckling, then the tire weight and complexity increase
Solution Approach 1:
Rather than uniformly increasing the side-reinforcing rubber layer thickness, the patent segments the reinforcement into specific thickness regions. The layer has different thicknesses at the equatorial plane, at the belt layer end portions, and at intermediate positions, providing targeted buckling resistance only where needed while minimizing overall material usage and structural complexity
Data Source
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AI summary
A run-flat radial tire (10) has a tire section height SH equal to or greater than 115 mm and is equipped with a side-reinforcing rubber layer (26) extending along an inner surface of a carcass (22) from one tire side portion (14) to another tire side portion (14), wherein a tire equatorial plane CL is sandwiched in between the one tire side portion and the another tire side portion, wherein a thickness GE of the side-reinforcing rubber layer at the position of the tire equatorial plane and a thickness GA of the side-reinforcing rubber layer at positions where the carcass reaches its maximum width satisfy the relational expression GE ≤ 0.6×GA.