Pneumatic Tire Bead Core Hexagonal Wire Array
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Solution Overview
Problem
Heavy duty tires face issues with bead toe lifting deformation, which complicates re-inflation and retreading, and increasing the winding number of bead wires to address this problem leads to higher material costs.
Innovation Solution
A pneumatic tire design featuring bead cores with a hexagonal wire array structure formed by winding bead wires in a close-packed manner, optimizing the layer number and array number of wire cross sections to balance core-collapse resistance and material costs, while suppressing lifting deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the winding number of bead wires is increased to suppress lifting deformation, then the lifting deformation of bead toe is suppressed, but the material costs of bead cores and peripheral members increase
Solution Approach 1:
The invention changes the geometric parameters of the bead core by specifying a hexagonal wire array structure with particular aspect ratio constraints (0.75≤M/N_max≤1.30) and centroid position constraints (1.05≤B/A). This parameter optimization allows effective lifting deformation suppression while controlling the number of bead wires and material usage, thereby resolving the contradiction between stability improvement and material cost increase
Solution Approach 2:
The invention employs an asymmetric hexagonal wire array structure where the centroid is deliberately positioned offset from the geometric center (with B/A≥1.05). This asymmetric configuration optimizes the distribution of mechanical stresses and improves lifting deformation resistance without requiring proportional increases in material quantity, thus addressing the contradiction between enhanced stability and material cost
2Strength
If the winding number of bead wires is increased to ensure core-collapse resistance, then the core-collapse resistance is improved, but the material costs increase
Solution Approach 1:
The invention optimizes the geometric parameters of the hexagonal wire array, specifically controlling the aspect ratio (M/N_max between 0.75 and 1.30) and centroid position (B/A≥1.05). These parameter changes enable effective core-collapse resistance with optimized material usage, resolving the contradiction between strength improvement and material cost increase
Solution Approach 2:
The invention transitions from conventional circular or rectangular wire arrangements to a hexagonal wire array structure. This dimensional/geometric transformation creates a more efficient space-filling pattern that enhances core-collapse resistance through better load distribution while potentially reducing the total number of wires required, thus addressing the contradiction between strength and material quantity
Data Source
AI summary
This pneumatic tire includes bead cores formed by winding a bead wire. In a cross-sectional view of the bead core, the bead core has a wire array structure of a hexagon formed by winding the bead wires in a close-packed manner. The hexagon is a projecting hexagon with an obtuse internal angle at every vertex. A layer number M of wire cross sections in a Y-axis direction and a maximum value N_max of an array number N of the wire cross sections in an X-axis direction satisfy 0.75≤M/N_max≤1.30. A distance A in a lateral direction from a vertex of the hexagon on the innermost side in the lateral direction to the centroid of the hexagon, and a distance B in the lateral direction from a vertex of the hexagon on the outermost side in the lateral direction to the centroid of the hexagon, satisfy 1.05≤B/A.