Tire Bead Structure with Circumferential Wire Orientation
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Solution Overview
Problem
Pneumatic tire bead structures face reduced operational life due to stresses and deformations from mechanical loads, leading to delamination and cracking, particularly at the ends of reinforcing members, which are sensitive to radial direction and material nature.
Innovation Solution
The pneumatic tire features a carcass ply extending between bead structures with circumferentially wound metal wires defining a cross-sectional profile with a height-to-width ratio greater than 1 and a bead orientation angle between 30 to 60 degrees, along with additional reinforcements like a chipper and apex, enhancing structural stability and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional bead structures with radial reinforcing members are used, then the tire can provide basic structural support, but the ends of the reinforcements are highly sensitive to stresses and deformations leading to reduced durability
Solution Approach 1:
The bead core is designed with an asymmetric cross-sectional shape that is elongated in the circumferential direction, creating a non-radial configuration. This asymmetric geometry redistributes stresses more uniformly across the bead structure, eliminating the stress concentration that occurs at the ends of radially-oriented reinforcing members in traditional designs.
Solution Approach 2:
The invention transitions from a radially-oriented reinforcement structure to one that is primarily circumferentially-oriented. By changing the dimensional orientation of the bead core from radial to circumferential elongation, the structure better withstands the cyclic bending and deformation forces experienced during tire operation, reducing fatigue and delamination.
2Reliability
If additional reinforcements are added to strengthen the bead structure, then durability improves, but the tire weight increases
Solution Approach 1:
The invention optimizes the geometric parameters of the bead core, specifically the height-to-width ratio and circumferential elongation, to achieve maximum structural efficiency with minimum material. By carefully controlling these dimensional parameters, the design provides enhanced durability without the need for excessive reinforcement material, thus avoiding unnecessary weight increase.
Solution Approach 2:
The bead structure utilizes a composite construction combining the circumferentially-elongated bead core with the carcass ply and tread components. This composite arrangement allows each layer to contribute optimally to the overall strength, providing durable reinforcement while minimizing the total material required and thus the weight.
3Reliability
If the bead structure is made more robust to withstand mechanical stresses, then reliability improves, but the complexity of the structure increases
Solution Approach 1:
The bead structure is segmented into distinct functional components: the circumferentially-elongated bead core, the carcass ply, and the tread. This segmentation allows each component to be optimized for its specific function while simplifying the overall design compared to a monolithic complex structure. The modular approach enables easier manufacturing and assembly.
Data Source
AI summary
A pneumatic tire comprises a carcass ply (10) extending from one bead structure (5) to another bead structure. Each bead structure (5) comprises a plurality of circumferentially wound wires or filaments defining a cross-sectional profile of a bead (21). The profile has a height to width ratio greater than 1 and a bead orientation angle (γ) in a range of from 30 degrees to 60 degrees. The bead orientation angle (γ) is the angle between a longitudinal axis of a radial cross section of the bead (21) and the radial direction (R) of the tire (1). The height is the height of the cross-sectional profile of the bead (21) along said longitudinal axis and the width is the width of the cross-sectional profile of the bead (21) perpendicular to said longitudinal axis.