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Tyre for heavy civil engineering vehicle

A heavy-duty vehicle and civil engineering technology, applied in the crown field of tires, can solve the problems of excessively hard crown reinforcements and shortened life of carcass reinforcements, and achieves good productivity, is beneficial to productivity, and reduces the risk of openings.

Active Publication Date: 2015-05-27
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] However, an additional layer consisting of two layers of metal reinforcement which is inelastic and forms an angle with the circumferential direction preferably between 5° and 10° and crosses from one layer to the other Reinforcements make the crown reinforcement too stiff
The stiffening of the crown reinforcement causes an increased sensitivity of the tire to knocks in the middle of the tread, since most of the deformation energy generated by the knocks is then transferred to the carcass reinforcement, the life of the carcass reinforcement is thus shortened

Method used

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  • Tyre for heavy civil engineering vehicle

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Effect test

Embodiment Construction

[0061] figure 1 Shows a meridional half-section of the crown of a tire 1 for civil engineering heavy vehicles, said tire comprising: - a tread 2, a crown reinforcement 3 and a carcass reinforcement 4, said crown reinforcement 3 being radially Upwardly inside the tread 2, said carcass reinforcement 4 is radially inside the crown reinforcement 3,

[0062] - The crown reinforcement 3 includes radially from the outside to the inside

[0063] - a protective reinforcement 5 comprising at least one protective layer (51, 52) formed by elastic metal reinforcements forming an angle with the circumferential direction at least equal to 10°,

[0064] - a working reinforcement 6 comprising at least two working layers (61, 62) formed of non-elastic metal reinforcements crossing from one working layer to the other and form an angle of at most 60° with the circumferential direction,

[0065] - an additional reinforcement 7, centered on the equatorial plane of the tyre, comprising at least o...

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Abstract

In order to desensitise the crown of a tyre for a heavy civil engineering vehicle in terms of impacts essentially hitting the centre of the tread, a tyre (1) is provided, comprising a tread (2), a bracing ply (3) and a casing ply (4), the bracing ply (3) comprising, radially from the outside towards the inside, a protective ply (5) comprising at least one layer (51, 52) consisting of elastic metal reinforcements, at an angle of ≥ 10° to the circumferential direction, a working ply (6) comprising at least two layers (61, 62) consisting of non-elastic metal reinforcements crossed from one working layer to the next, at an angle of ≤ 60° to the circumferential direction, and an additional ply (7) centered on the equatorial plane of the tyre, comprising at least one additional layer (71, 72) consisting of elastic metal reinforcements that, when extended, have a maximum elastic modulus of 150 GPa, at an angle of ≤ 10° to the circumferential direction.

Description

technical field [0001] The present invention relates to radial tires intended to be fitted to heavy vehicles for civil engineering, and more particularly to the crown of such tires. Background technique [0002] Although not limited to this type of application, the invention is described with more particular reference to large-sized radial tires intended to be fitted, for example, to dump trucks for transport from quarries or Vehicles for materials extracted from open pit mines. The rim of such tires has a nominal diameter of at least 25 inches within the meaning of the European Tire and Rim Technical Organization or ETRTO standard. [0003] The tire consists of two beads providing a mechanical connection between the tire and the rim on which it is mounted, the beads being bonded respectively by two sidewalls to the tread, which is intended to pass through the tread surface contact with the road. [0004] Since the geometry of a tire exhibits rotational symmetry with resp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C9/20
CPCB60C9/2006B60C2200/06B60C9/0007B60C2200/065B60C2009/208Y10T152/10801B60C9/2003B60C2009/0078B60C2009/0085B60C2009/2051B60C2009/209
Inventor O·费林
Owner MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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