Tire having improved wear properties and improved rolling resistance

A tire and carcass technology, applied in the direction of rolling resistance optimization, heavy-duty tires, tire parts, etc., can solve problems such as poor performance and wear

Active Publication Date: 2018-08-03
MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0025] During tests, the inventors have demonstrated that the presence of some types of longitudinal cuts including concealed voids leads to poorer performance in terms of wear and to the occurrence of damage in the transverse direction compared to similar tires also used which do not include such concealed voids. irregular wear pattern

Method used

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  • Tire having improved wear properties and improved rolling resistance
  • Tire having improved wear properties and improved rolling resistance
  • Tire having improved wear properties and improved rolling resistance

Examples

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Embodiment Construction

[0128] exist figure 1 In , a tire 1 of size 315 / 70R 22.5 has an aspect ratio H / S equal to 0.70, where H is the height of the tire 1 on its mounted rim and S is its maximum axial width. Said tire 1 comprises a radial carcass reinforcement 2 anchored in two beads (not shown in the figures). The carcass reinforcement is formed from a single layer of metal cords. The carcass reinforcement 2 is wrapped by a crown reinforcement 4 formed radially from the inside to the outside by:

[0129] - a first working layer 41 formed of unwrapped 9.28 non-extensible metal cords continuous over the entire width of the ply and oriented at an angle of 24°,

[0130] - a layer 42 of circumferential reinforcing elements formed of 21x23 steel metal cords of the "dual modulus" type,

[0131] - a second working layer 43 formed of unwrapped 9.28 non-extensible metal cords continuous over the entire width of the ply and oriented at an angle equal to 24° and crossing the metal cords of layer 41,

[01...

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PUM

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Abstract

The invention relates to a tire including a crown reinforcement formed of at least two working crown layers (41, 43) of reinforcing elements and at least one layer (42) of circumferential reinforcingelements. In accordance with the invention, the tread has at least one longitudinally oriented cut (8), the depth, measured on a new tire, of the at least one longitudinally oriented cut being greaterthan or equal to 40% of the thickness of the tread, the ratio of the width measured at the bottom of the at least one longitudinally oriented cut to the width measured on the surface of the tread ofthe at least one longitudinally oriented cut is strictly greater than 2, the tensile modulus of elasticity at 10% elongation of at least one calendering layer of at least one working crown layer is greater than 9 MPa, and the maximum value of tan(8), denoted tan(8)max, of the at least one calendering layer of at least one working crown layer is less than 0.100.

Description

technical field [0001] The present invention relates to tires with radial carcass reinforcement, and more particularly to tires, for example intended to equip vehicles carrying heavy loads traveling at sustained speeds, such as trucks, tractors, trailers or coaches. Background technique [0002] In heavy tyres, the carcass reinforcement is usually anchored on either side in the bead area and is radially covered by a crown reinforcement consisting of at least two superimposed layers of The layers are formed by threads or cords parallel in each layer and crossing from one layer to the next so as to form an angle with the circumferential direction of between 10° and 45°. Said working layer forming the working reinforcement may further be covered by at least one layer called protective layer formed by reinforcing elements, advantageously metallic and stretchable and called elastic Reinforcement elements. It may also comprise layers of wires or cords of low elongation at an ang...

Claims

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Application Information

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IPC IPC(8): B60C9/20B60C11/12B60C11/03B60C9/18B60C9/22
CPCB60C9/185B60C9/2006B60C9/22B60C11/0323B60C11/1281B60C2009/1842B60C2009/2064B60C2011/1209B60C2200/06Y02T10/86
Inventor P·热尔韦斯G·戈多B·匡蒂尼特T·日夫科维奇
Owner MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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