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Tires with improved wear properties and improved rolling resistance

A tire and tread technology, which is applied in the direction of rolling resistance optimization, heavy-duty tires, tire parts, etc., can solve the problems of poor application performance and achieve the effect of reducing changes

Active Publication Date: 2020-09-01
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] In the course of tests, the inventors have demonstrated that the presence of some types of oblique cuts including concealed voids results in poorer application performance in terms of wear compared to similar tires intended for the same application but not comprising such concealed voids, and Occurrence of irregular wear patterns in the transverse and / or longitudinal direction depending on the angle formed between the oblique cuts and the circumferential direction

Method used

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  • Tires with improved wear properties and improved rolling resistance
  • Tires with improved wear properties and improved rolling resistance
  • Tires with improved wear properties and improved rolling resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0167] 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. Said carcass reinforcement 2 is hooped by a crown reinforcement 4 formed radially from the inside to the outside by:

[0168] - 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°,

[0169] - a layer 42 of circumferential reinforcing elements formed of 21x23 steel metal cords of the "dual modulus" type,

[0170] - 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 comprising a crown reinforcement formed by at least two working crown layers (41, 43) with reinforcing elements and at least one layer of circumferential reinforcing elements (42), the layer C being arranged on the working tire between the ends of the canopy. According to the invention, the tread has at least one obliquely oriented incision (7) having a depth, measured on a brand new tyre, greater than or equal to 40% of the thickness of the tread, in which at least one the ratio of the width measured at the bottom of the obliquely oriented incisions to the width of said at least one obliquely oriented incision at the tread surface is greater than 1.2, and the modulus of elasticity in tension at 10% elongation of layer C is greater than 9MPa, layer C by tan(δ) max The maximum value of tan(δ) indicated is less than 0.100.

Description

technical field [0001] The present invention relates to tires with radial carcass reinforcement, and more particularly to tires intended to fit vehicles carrying heavy loads and traveling at sustained speeds, such as trucks, tractors, trailers or passenger vehicles. 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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Patent Type & Authority Patents(China)
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