Bi-modulus Metal Cords for Tire Hooping Reinforcement
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Solution Overview
Problem
Current tire reinforcement technologies using textile wire elements for hooping reinforcement face issues with high noise emission, high cost, low thermal stability, and limited mechanical protection, while metallic wire elements offer improved mechanical properties but require innovative designs to balance noise reduction and performance.
Innovation Solution
A metallic wire cable with a single layer wound in a helix configuration, optimized for specific modulus values and elongation properties to reduce noise and enhance shrinkage capacity, using steel wire elements that are thermally stable and cost-effective, with a unique structural design that maintains performance under varying stresses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If textile wire elements are used for shrink-fit reinforcement, then cost is reduced and flexibility is improved, but noise emission increases and thermal stability deteriorates
Solution Approach 1:
The patent employs a composite cable structure combining steel wire elements (for strength and thermal stability) with textile sheathing (for flexibility and noise damping). This composite approach allows the reinforcement to maintain low noise emission and high thermal stability while retaining necessary flexibility for tire application.
Solution Approach 2:
The patent specifies steel wire elements with diameter between 0.15mm and 0.35mm and tensile strength between 1500MPa and 3000MPa. By optimizing these parameters, the reinforcement achieves low noise emission while maintaining high thermal stability suitable for high-speed tire applications.
2Object-generated harmful factors
If textile wire elements are used for shrink-fit reinforcement, then cost is reduced, but mechanical protection capability deteriorates
Solution Approach 1:
The patent uses a composite structure with steel wire elements providing mechanical strength and puncture protection, while textile sheathing provides cost-effective flexibility. This combination delivers superior mechanical protection compared to pure textile solutions while remaining cost-effective.
Solution Approach 2:
The patent applies different materials in different functional zones: steel wire elements provide localized mechanical protection where puncture resistance is critical, while textile sheathing provides cost-effective coverage in areas requiring flexibility. This local differentiation optimizes both cost and mechanical protection.
3Weight of moving object
If a single working layer is used in crown reinforcement, then tire weight is reduced, but compression capacity of wire elements deteriorates
Solution Approach 1:
The patent specifies steel wire elements with optimized diameter (0.15mm-0.35mm) and high tensile strength (1500MPa-3000MPa). These parameter changes enable a single working layer to achieve sufficient compression capacity to counteract centrifugal forces at high speeds while minimizing tire weight.
Solution Approach 2:
The patent uses homogeneous steel wire elements throughout the single working layer, ensuring uniform compression capacity and stress distribution. This homogeneity allows the simplified single-layer structure to perform as effectively as more complex multi-layer designs.
4Object-generated harmful factors
If wire reinforcement elements are optimized for low noise, then noise emission is reduced, but compression capacity may deteriorate
Solution Approach 1:
The patent optimizes wire element diameter (0.15mm-0.35mm) and tensile strength (1500MPa-3000MPa) to achieve low noise emission through reduced vibration, while simultaneously ensuring sufficient compression capacity. The high strength-to-diameter ratio allows thin wires to maintain both low noise and high compressive performance.
Solution Approach 2:
The composite cable structure combines steel wire elements (optimized for low noise) with textile sheathing (providing additional compression support). This composite approach allows the wire elements to be optimized for noise reduction without sacrificing overall compression capacity, as the textile component supplements the compressive function.
Data Source
Figure 1
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AI summary
The invention relates to a cord (50) comprising a single ply (52) of helically wound metal wire elements (54), such that: 5 GPa ≤ M 1 ≤ 16 GPa, and 40 GPa ≤ M 2 ≤ 160 GPa, and 3 ≤ M 2/M 1.