Reinforced Tyre Lower Zone for Low Rolling Resistance Rigidity
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Solution Overview
Problem
Current tire designs face challenges in achieving a balance between low rolling resistance and maintaining satisfactory rigidity, particularly in terms of lateral and drift rigidity, while also ensuring endurance and manufacturability.
Innovation Solution
The tire features crossed reinforcing elements oriented at specific angles, combined with a stiffening reinforcement frame composed of textile or metallic threads, embedded in a low-modulus rubber composition, which reduces the need for rigid rubber in the lower zone and enhances rigidity through strategic placement and material choice.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If bulky and very rigid padding (high modulus rubber composition) is used in the lower zone of the tire, then the rigidity of the tire is improved, but the rolling resistance increases due to significant hysteretic loss
Solution Approach 1:
The patent changes the material parameter by using a rubber composition with reduced modulus (softer rubber) in the lower zone instead of high modulus rigid rubber, thereby reducing hysteretic loss and rolling resistance while maintaining necessary rigidity through structural design
Solution Approach 2:
The patent creates a composite structure combining softer rubber composition with a specific geometric arrangement of carcass reinforcement (crossed strands at specific angles) to achieve the necessary rigidity without relying on rigid rubber material
2Loss of energy
If the volume of rigid rubber is reduced in the lower zone to decrease rolling resistance, then energy loss is reduced, but the overall rigidity of the tire significantly decreases
Solution Approach 1:
The patent changes the modulus parameter of the rubber composition in the lower zone to a lower value, reducing the material's inherent rigidity but compensating through structural configuration
Solution Approach 2:
The patent uses specific angular orientations (inclined at angles between 30° and 60° relative to the axial direction) of the carcass reinforcement strands to create a geometric structure that provides rigidity through shape and arrangement rather than material stiffness
Data Source
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AI summary
The invention relates to a tyre for a motor vehicle, comprising: - two beads (20) intended to come into contact with a mounting rim (5), each bead (20) comprising at least one annular reinforcing structure (70), each annular reinforcing structure (70) having a radially innermost point (71); two sidewalls (30) extending the beads (20) radially towards the outside, the two sidewalls (30) joining together at a crown (25) comprising a crown reinforcement having at least one ply (80; 90) provided with crown reinforcing elements, the crown reinforcement furthermore being surmounted by a tread (40); - at least one carcass reinforcement (160) extending from the beads (20) through the sidewalls (30) to the crown (25), the carcass reinforcement (160) having a plurality of carcass reinforcing elements and being anchored in the two beads (20) by a turn-up about the annular reinforcing structure (70), so as to form in each bead an outward strand (162) and a return strand (163), - a stiffening reinforcement (140) arranged in at least one sidewall of the tyre, said stiffening reinforcement (140) having a radially inner end (141) and a radially outer end (142), the stiffening reinforcement being formed of a plurality of stiffening elements oriented at an angle less than or equal to 10° with respect to a circumferential direction of the tyre.