Pneumatic Tyre Bead Reinforcement Using Fine Textile Yarns
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Solution Overview
Problem
Current pneumatic vehicle tires face challenges in reducing cost and weight while improving rolling resistance without compromising other properties.
Innovation Solution
The tire features a bead reinforcement with textile yarns of uniform material, specifically polyamide or polyester, with fineness ≤700 dtex, arranged in a twisted construction (1x1, 1x2, or 1x3) and spaced at a clear distance for low material usage and improved fatigue resistance, ensuring effective rubber penetration and cross-bonding with the carcass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If textile reinforcement elements with higher fineness (e.g., 700-900 dtex core yarn with aramid helix) are used in the bead reinforcement, then the strength and durability of the tire are improved, but the weight and cost of the tire increase
Solution Approach 1:
The patent changes the fineness parameter of the textile yarn from conventional higher values (700-900 dtex) to lower values (≤500 dtex, preferably 235-470 dtex). This parameter change reduces the yarn thickness and weight while maintaining adequate strength through optimized twist factors and yarn construction (1x1, 1x2, or 1x3). The reduced yarn fineness directly decreases the bead reinforcement layer thickness and overall tire weight.
2Strength
If more material is used in the bead reinforcement layer, then the strength and handling properties are improved, but the cost and weight of the tire increase
Solution Approach 1:
The patent optimizes multiple parameters simultaneously: yarn fineness (≤500 dtex), twist factor (α=10-300 depending on construction), and yarn construction (1x1, 1x2, or 1x3). These parameter changes enable achieving adequate strength with reduced material quantity. The optimized twist factor ensures proper compactness and strength without excessive material usage.
Solution Approach 2:
The patent applies different yarn constructions (1x1, 1x2, or 1x3) and twist factors (α=10-80 for 1x1, α=50-300 for 1x2/1x3) tailored to specific positions and functional requirements within the bead reinforcement. This local optimization ensures adequate strength where needed while minimizing material usage in less critical areas.
3Duration of action of stationary object
If thicker reinforcement layers are used, then the durability and strength are improved, but the rolling resistance and weight increase
Solution Approach 1:
The patent reduces the bead reinforcement layer thickness by using finer yarns (≤500 dtex) with optimized twist factors. This parameter change creates a thinner reinforcement layer that reduces the tire's overall weight and rolling resistance. The durability is maintained through optimized yarn construction and twist rather than increased thickness.
4Ease of manufacture
If uniform textile yarns with fineness ≤500 dtex are used, then the manufacturing cost and weight are reduced, but the strength may be compromised
Solution Approach 1:
The patent compensates for the lower yarn fineness (≤500 dtex) by optimizing the twist factor (α=t/m×dtex×10000, where α=10-80 for 1x1 construction and α=50-300 for 1x2/1x3 construction). This parameter optimization ensures that the thinner yarns achieve adequate strength through proper twist compactness without requiring higher material cost.
Solution Approach 2:
The patent uses composite yarn constructions combining different yarn types (e.g., 1x2 or 1x3 constructions where multiple yarns are twisted together). This composite approach distributes the load across multiple finer yarns, achieving adequate strength while using cheaper, finer materials instead of expensive high-fineness single yarns.
Data Source
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AI summary
The invention relates to vehicle pneumatic tyres comprising a radial carcass (2) and two bead regions (1), each having a bead core (3) and a bead core filler (4) positioned on the bead core (3), wherein the carcass (2) is guided around the bead cores (3) axially outwards from axially inside, terminating in a carcass turnup (2a), and wherein the bead reinforcing means (6) are arranged in both bead regions (1) of the vehicle pneumatic tyre, and wherein the bead reinforcing means has reinforcing supports consisting of at least one textile yarn, wherein all textile yarns of the reinforcing support consist of the same material and each yarn has a fineness < 700 dtex.