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Tire having improved wear properties

A technology for tires and carcass, applied in the direction of heavy-duty tires, tire parts, reinforcement layers of pneumatic tires, etc., which can solve problems such as wear and performance deterioration

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 the 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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  • Tire having improved wear properties
  • Tire having improved wear properties
  • Tire having improved wear properties

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0151] 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:

[0152] - 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°,

[0153] - a layer 42 of circumferential reinforcing elements formed of 21x23 steel metal cords of the "dual modulus" type,

[0154] - 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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Abstract

The invention relates to a tire including a crown reinforcement consisting of at least two working crown layers (41, 43) of reinforcing elements, and at least one layer (42) of circumferential reinforcement elements, a layer C of rubber mixture being arranged between the ends of the working crown layers. According to the invention, the tread has at least one longitudinal indentation (8), the depth, measured on a new tire, of said at least one longitudinal indentation not being less than 40% of the thickness of the tread, the ratio of the width measured at the bottom of said at least one longitudinal indentation to the width measured at the surface of the tread of said at least one longitudinal indentation being strictly greater than 2, the distance d between the end of the axially narrowest working layer and the working layer separated from the axially narrowest working layer by the layer C of rubber mixture being such that l.lo < d < 2.2o, o being the diameter of the reinforcement elements of said at least one layer of circumferential reinforcement elements, and in a meridian plane, the thickness of the layer C of rubber mixture being substantially constant along the axial width included between the axially inner end of the layer C and the end of the axially narrowest working layer.

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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Patent Type & Authority Applications(China)
IPC IPC(8): B60C9/20B60C11/12B60C11/03B60C9/18B60C9/22
CPCB60C9/2006B60C2200/06B60C2011/1209B60C2009/2064B60C2009/1842B60C11/125B60C11/1281B60C11/0323B60C9/185B60C9/22B60C2009/2257
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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