Vehicle Tyre Reinforcing Cord Section and Stiffness Optimization
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Solution Overview
Problem
High-performance and ultra-high-performance tires face challenges in achieving optimal mechanical characteristics, rolling resistance, and drivability, as existing reinforcing cord designs either prioritize structural strength at the expense of rolling resistance or vice versa, making it difficult to simultaneously improve all these factors.
Innovation Solution
A tire design featuring a belt structure with reinforcing cords having a specific section area and Taber stiffness range, composed of two metal wires with diameters between 0.27 mm and 0.29 mm, and a twisting pitch of 10 mm to 20 mm, which balances weight, rolling resistance, and mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If reinforcing cords with larger section area are used to improve mechanical strength, then strength increases, but rolling resistance increases and weight increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the section area of reinforcing cords within the range of 0.110-0.185 mm² and Taber stiffness within 15-35 TSU. By optimizing these parameters, the patent achieves a balance where the cords provide sufficient mechanical strength while minimizing rolling resistance and weight, resolving the contradiction between strength and energy loss.
Solution Approach 2:
The patent uses composite construction by combining multiple reinforcing cords with specific geometric and material properties. The belt structure comprises a plurality of reinforcing cords made from textile or metallic material embedded in elastomeric material, creating a composite system that achieves optimal strength-to-weight ratio and minimizes rolling resistance while maintaining mechanical integrity.
2Strength
If reinforcing cords with larger section area are used to improve mechanical strength, then strength increases, but weight increases
Solution Approach 1:
The patent optimizes the section area parameter of reinforcing cords to fall within 0.110-0.185 mm², which is sufficient to provide the required mechanical strength for HP and UHP tyres while minimizing the weight contribution of the reinforcing structure. This parameter optimization directly addresses the contradiction between strength and weight.
Solution Approach 2:
The patent applies local quality by varying the distribution and properties of reinforcing cords in different regions of the belt structure. By strategically placing cords with specific section areas and stiffness values in different zones, the patent achieves uniform strength distribution throughout the tyre while minimizing overall weight, rather than uniformly increasing cord dimensions throughout.
Data Source
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AI summary
A tyre (100) for vehicle wheels comprises a belt structure comprising at least one reinforcing layer consisting of a plurality of reinforcing cords (10), each of which has an overall section comprised between 0.110 mm2and 0.135 mm2and a Taber stiffness comprised between 20 and 28 TSU; preferably, each reinforcing cord (10) consists of two metal wires (11), each of which has a diameter greater than, or equal to, about 0.27 mm and lower than 0.30 mm.