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Tire 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 the increase of kilometers and the impact of durability, and achieve the effect of reducing changes

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

The combination of conditions in which such tires are used for driving undoubtedly leads to an increase in the number of kilometers traveled due to the reduced wear on the tire; but on the other hand, the durability of the tire and especially the crown reinforcement is adversely affected

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0152] 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:

[0153] - a first working layer 41 formed of unwrapped 9.28 non-extensible metal cords that are continuous over the entire width of the ply and oriented at an angle of 24°, - of 21x23 steel of the "dual modulus" type layer 42 of circumferential reinforcing elements formed of metallic cords,

[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,

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PUM

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Abstract

The invention relates to a tire including a crown reinforcement consisting of at least two working crown plies (41, 43) of reinforcement elements, and at least one ply (42) of circumferential reinforcement elements, a ply C being arranged between the ends of the working crown plies. According to the invention, the tread has a plurality of transverse indentations (9) defined by facing walls of material, the depth, measured on a new tire, of at least one transverse indentation being no less than 40% of the thickness of the tread, the width measured at the bottom of said at least one transverse indentation being strictly greater than 4 mm, and the modulus of elasticity under tension at 10% elongation of the ply C is less than 8 MPa, the maximum value of tan(delta), denoted tan(delta)max, of the ply C being 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 Applications(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
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