Heavy-Vehicle Tire Crown With Chainmail Anti-Puncture Layer
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Solution Overview
Problem
Radial tires for heavy vehicles face challenges in puncture resistance, particularly when running over sharp stones, due to the high loads and harsh terrains they operate on.
Innovation Solution
The radial tire incorporates a crown reinforcement with at least two layers of transverse metal reinforcers and an additional anti-puncture layer made of chainmail constituted by metal rings coated with a polymeric material, which provides enhanced puncture resistance without significantly increasing the tire's mass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional protective layers are used to improve puncture resistance, then the tire's resistance to indenting bodies is improved, but the tire's mass increases
Solution Approach 1:
The patent changes the structural parameters of the protective layer by using chainmail constituted by metal rings with specific geometric configurations (outer diameter, wall thickness, mesh size) instead of traditional solid or layered structures. This parameter change achieves high puncture resistance while controlling mass through optimized ring geometry and material distribution.
Solution Approach 2:
The patent employs composite construction by combining metal rings (providing structural strength and puncture resistance) with polymeric coating material (providing surface protection and flexibility). This composite approach creates a protective layer that achieves superior puncture resistance-to-mass ratio compared to traditional single-material protective layers.
2Reliability
If the crown reinforcement is strengthened to improve durability, then the tire's resistance to harsh terrains is improved, but the device complexity increases
Solution Approach 1:
The patent segments the protective layer into discrete metal rings arranged in a chainmail pattern rather than using a continuous solid structure. This segmentation provides several advantages: each ring can independently deform to absorb impact energy, the modular structure simplifies manufacturing and assembly, and the gaps between rings reduce material usage while maintaining overall structural integrity.
Solution Approach 2:
The chainmail structure introduces dynamic behavior to the protective layer, allowing the metal rings to deform, rotate, and reconfigure in response to external forces from harsh terrains. This dynamic capability enables the structure to adapt to varying impact conditions, improving durability without requiring an overly complex rigid structure.
Data Source
AI summary
Radial tire for heavy vehicles, having a load index greater than 1050 kg, with a crown reinforcement (3) having at least two layers of metal transverse reinforcers (321, 322), forming, with the circumferential direction, oriented angles of opposite signs at least equal to 10° and at most equal to 70°, having a breaking strength at least equal to 80 daN. The crown reinforcement having at least one radially outermost anti-puncture layer, constituted of chainmail of metal rings of a ferrous alloy. The chainmail being coated in at least one polymeric material, in that the mass of an anti-puncture layer is at most equal to 70% of the mass of the other crown layers.