Tires with improved wear and rolling resistance properties

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

Active Publication Date: 2020-10-09
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] The inventors have demonstrated during experiments that the size of the concealed voids including the longitudinal and transverse cuts (both cuts) can be relatively small compared to a similar tire for the same application not comprising such concealed voids ) in combination may cause reduced performance in terms of wear and irregular wear shapes

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0154] 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:

[0155] - 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°,

[0156] - a layer 42 of circumferential reinforcing elements formed of 21x23 steel metal cords of the "dual modulus" type,

[0157] - 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) of reinforcing elements and at least one layer (42) of circumferential reinforcing elements, layer C being arranged in between the ends of the working crown layers. According to the invention, the tread has at least one longitudinal incision (8) and at least one transverse incision (10), the depth of which, measured on a brand new tyre, is greater than or equal to 40 of the tread thickness %, the ratio of the width measured at the bottom of said at least one longitudinal cut to the width of said longitudinal cut measured at the tread surface is strictly greater than 1.2, the width measured at the bottom of said at least one transverse cut to the width measured at the tread surface The ratio of the width of said at least one transverse incision measured at the tread surface of a brand new tire is not less than 1, the tensile modulus of elasticity of layer C at 10% elongation is greater than 9 MPa, and the tan(δ) of layer C is 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, 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 Patents(China)
IPC IPC(8): B60C9/20B60C11/12B60C11/03B60C9/18B60C9/22
CPCB60C9/185B60C9/2006B60C9/22B60C11/0323B60C11/1281B60C2009/1842B60C2009/2064B60C2011/1209B60C2011/1245B60C2200/06Y02T10/86
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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