Reinforced lightweight tyre

Abstract

Tyre with a maximum axial width SW and axial width RW at the beads, comprising a crown reinforcement of width TW and a radial carcass reinforcement, in which tyre, when it is fitted onto its mounting rim and inflated to its service pressure and equilibrium, the following conditions are satisfied: TW / SW <= 75%, TW / RW <= 85% and X / SH <= 50%, where X is the radial height at which the tyre has its maximum axial width and SH denotes the radial height of the tyre; Y / SH >= 80%, where Y is the radial height of the carcass reinforcement at the end of the crown reinforcement; and Z / SH >= 90%, where Z denotes the radial height of the carcass reinforcement, wherein the absolute value of the angle a between the tangent to the carcass reinforcement at the points on the carcass reinforcement having the same axial positions as the axial ends of the crown reinforcement and the axial direction is less than or equal to 22 DEG , and wherein each of the sidewalls comprises at least two crossed reinforcing members.

Description

technical field [0001] The present invention relates to radial tires for land vehicles, and more particularly to radial tires for passenger vehicles. The invention relates more particularly to lightweight tires and to an arrangement suitable for increasing the resistance of these tires to the damage to which they are exposed when they hit an obstacle on the ground, such as a pavement or a pothole. Background technique [0002] Research on tires for reducing energy consumption of vehicles is currently gaining momentum. Among the promising approaches developed by tire designers, mention may be made of reducing the rolling resistance of tires, in particular by using low-hysteresis materials, and reducing tire weight. It has been proposed to reduce the thickness of the material and the density of the reinforcing elements or the rubber compound (use of textile cords), or by using reinforcing elements that allow a certain volume reduction of the innerliner compound (for example i...

AI Technical Summary

Problems solved by technology

This can cause the walls to rupture and the tires to suddenly lose their inflation pressure, which usually means that the vehicle is immediately immobilized

However, even when a tire is subjected to said impact, it is often found that its components have been damaged by the accident: indentations or other signs in the sidewall indicate to the tire expert that the structure of the tire has been weakened, and that the sidewall of the tire has Long-term risk of rupture from repeated flexing of tire components, which is clearly incompatible with the conditions required for safe driving

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