Tyre having improved wear and rolling resistance properties

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 wear performance and wear, and achieve the effect of limiting temperature rise

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 the appearance of irregular wear pattern

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0116] in figure 1 Among them, the tire 1 with a size of 315 / 70R 22.5 has an aspect ratio H / S equal to 0.70, H is the height of the tire 1 on its mounting rim, and S is its maximum axial width. The tire 1 includes a radial carcass reinforcement 2 anchored in two beads (not shown in the figure). The carcass reinforcement is formed of a single layer of metal cords. The carcass reinforcement 2 is wrapped by a crown reinforcement 4, which is formed from the inside to the outside in the radial direction by the following parts:

[0117] -A first working layer 41 formed of unwrapped 9.28 non-stretchable metal cords that are continuous over the entire width of the ply and oriented at an angle of 24°,

[0118] -A layer 42 of circumferential reinforcing elements formed by 21x23 steel metal cords of the "dual modulus" type,

[0119] -A second working layer 43 formed of unwrapped 9.28 non-stretchable metal cords that are continuous over the entire width of the ply and oriented at an angle equ...

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PUM

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Abstract

The invention relates to a tyre comprising a crown reinforcement made up of at least two working crown layers of reinforcing elements and of at least one layer of circumferential reinforcing elements.According to the invention, the tread includes at least one longitudinal notch, the depth of said at least one longitudinal notch, measured on a new tyre, being greater than or equal to 40% of the thickness of the tread, and the ratio of the width of said at least one longitudinal notch measured at the base thereof to the width of same measured at the surface of the tread is strictly greater than2. The tensile modulus of elasticity at 10% elongation of at least one skim coat of at least one working crown layer is less than 8.5 MPa, and the maximum tan([delta]) value, denoted tan([delta])max,of the at least one skim coat 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 reinforcements, and more particularly to tires intended to be equipped with heavy-duty load-carrying vehicles (such as trucks, tractors, trailers or buses) running at sustained speeds. Background technique [0002] In heavy-duty tires, the carcass reinforcement is usually anchored on either side of the bead area and is covered in the radial direction by a crown reinforcement consisting of at least two superimposed layers, the at least two superimposed layers The layers are formed of threads or cords that are parallel in each layer and cross from one layer to the next so as to form an angle between 10° and 45° with the circumferential direction. The working layer forming the working reinforcement may be further covered by at least one layer called a protective layer, said layer being formed by reinforcing elements, which are advantageously metallic and stretchable and are called elastic Reinforcemen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C9/20B60C11/12B60C11/03B60C9/22
CPCB60C9/2006B60C9/22B60C11/0323B60C11/1281B60C2009/2064B60C2011/1209B60C2200/06Y02T10/86
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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