Tyre having improved wear and rolling resistance properties

A technology for tires and carcass, applied in the direction of rolling resistance optimization, heavy-duty tires, tire parts, etc., can solve the problems of increased mileage, impact on durability, etc., 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

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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  • 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
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Effect test

Embodiment Construction

[0117] To simplify understanding, the drawings are not shown to scale. figure 1 Only a half view of the tire is shown, the tire extending symmetrically with respect to the axis XX', which represents the circumferential median plane or equatorial plane of the tire.

[0118] 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 in the radial direction from the inside to the outside by the following parts:

[0119] -A first working layer 41 formed by unwrapped non-stretchable metal cords 9.28 which are continuous across the entire width of the ply and oriented at an angle of 24°,

[0120] -A layer 42 o...

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PUM

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Abstract

The invention relates to a tyre 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 reinforcingelements. According to the invention, the tread includes a plurality of transverse notches (9) defined by opposing walls of a material, the depth of at least one transverse notch, measured on a new tyre, being greater than or equal to 40% of the thickness of the tread, and the width measured at the base of said at least one transverse notch being strictly greater than 4mm. The tensile modulus ofelasticity 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 coatof 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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