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Tire having improved wear properties

A technology for tires and carcasses, applied in heavy-duty tires, tire parts, reinforcement layers of pneumatic tires, etc., can solve problems such as increased kilometers and durability effects

Active Publication Date: 2018-08-21
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 properties
  • Tire having improved wear properties
  • Tire having improved wear properties

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0154] exist figure 1 where the 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 radial carcass reinforcements 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 inextensible 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 from 21x23 steel metal cords of the "dual modulus" type,

[0157] - a second working layer 43 formed of unwrapped 9.28 inextensible metal cords continuous over the entire width of the ply and oriented at an angle equal to 24° and intersecting 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 and the width measured at the bottom of said at least one transverse indentation being strictly greater than 4 mm, and the distance d between the end of the axially narrowest working ply and the working ply separated from the axially narrowest working ply by the plyC of rubber mixture is such that l.lo < d < 2.2o, 0being the diameter of the reinforcement elements of said at least one ply of circumferential reinforcement elements; in a meridian plane, the thickness of the ply C of rubber mixture being substantially constant across the axial width between the axially inner end of the ply C and the end of the axially narrowest working ply.

Description

technical field [0001] The present invention relates to tires with radial carcass reinforcements, and more particularly to tires, for example, intended to be equipped with heavy-duty vehicles such as vans, tractors, trailers or buses, traveling at sustained speeds. Background technique [0002] In heavy duty tires, 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, said at least two superimposed layers The layers are formed of wires 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. 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 Enhancement element. It may also comprise layers of wire...

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
CPCB60C9/185B60C9/2006B60C9/22B60C11/0323B60C11/125B60C11/1281B60C2009/1842B60C2009/2064B60C2009/2257B60C2011/1209B60C2200/06
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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