Tyre Bead Profile Geometry for Higher Lateral Stiffness
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Solution Overview
Problem
Existing tyre bead structures do not adequately enhance lateral stiffness, which affects handling performance.
Innovation Solution
A tyre bead profile structure is designed with specific X and Y coordinates and curvature radii to improve lateral stiffness, ensuring pre-contact with the rim under high loads, eliminating the need for a rim guard and optimizing curvature radii for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional bead structures (RPB or RCL types) are used, then the tyre can be manufactured with standard designs, but lateral stiffness is insufficient and handling performance is compromised
Solution Approach 1:
The patent applies parameter changes by precisely defining the bead outermost point coordinates (X: 8.8-9.7mm, Y: 19.2-21.7mm) and curvature radii (R1: 30-100mm, R2: 1000mm-∞, R3: 0.5-2mm) to optimize lateral stiffness. This quantitative parameter optimization resolves the contradiction by achieving improved handling performance through controlled geometric parameters rather than complex structural modifications.
2Reliability
If the bead profile is optimized for lateral stiffness, then handling performance improves, but the tyre section width positioning becomes critical requiring precise coordinate control
Solution Approach 1:
The patent establishes specific parameter ranges for bead coordinates (X: 8.8-9.7mm, Y: 19.2-21.7mm) that balance handling performance with manufacturing feasibility. By defining acceptable ranges rather than single precise values, the patent resolves the contradiction between reliability improvement and manufacturing precision requirements.
Solution Approach 2:
The patent performs preliminary optimization of bead coordinates and curvature radii during the design phase to ensure that the tyre section width positions correctly at outermost position when air is injected. This preliminary action prevents the need for rim guards and ensures proper tyre-rim interaction before the tyre is put into service.
3Strength
If the outer curvature radius of lower bead portion is reduced to improve lateral stiffness, then pre-contact with rim under high loads is achieved, but the bead structure becomes more constrained
Solution Approach 1:
The patent optimizes the outer curvature radius of the lower bead portion (R1: 30-100mm) to achieve the right balance between lateral stiffness and bead flexibility. This parameter optimization enables pre-contact with the rim under high loads for improved handling while maintaining sufficient bead flexibility for proper tyre-rim interaction and ease of mounting.
Data Source
AI summary
One embodiment relates to a tyre with a bead profile structure, comprising a tread, sidewalls, and beads 10 for improving lateral stiffness, wherein the bead (10) has a range in which the X-coordinate is 8.8-9.7 mm and the Y-coordinate is 19.2-21.7 mm from origin (O), which is a common European Tyre and Rim Technical Organization (ETRTO) rim standard reference point of a bead outermost point (P) that is in contact with a wheel rim.