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Heavy goods vehicle tyre

A technology for tires and tire crowns, applied to wheels, vehicle parts, tire parts, etc., can solve problems such as tire damage, delay the appearance and/or spread of cracks, and improve resistance

Active Publication Date: 2009-09-09
OCIETE DE TECH MICHELIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When this stiffness is increased, for example in particular when passing over larger sized stones, whereby an impact is generated at the crown of the tire, irreparable damage may result to the tire due to this increased stiffness

Method used

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  • Heavy goods vehicle tyre
  • Heavy goods vehicle tyre

Examples

Experimental program
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Effect test

Embodiment Construction

[0049] figure 1 A partial schematic view in meridian section of a tire 1 of size 40.00R57 is shown.

[0050] The tire 1 comprises a radial carcass reinforcement 2 fixed in each bead; said beads are not shown in the figures. This radial carcass reinforcement is covered radially outwards on top of it with a crown reinforcement 3 comprising, radially from the inside to the outside:

[0051] - a first working crown ply 31 formed by inextensible metal cords made of steel forming an angle α1 equal to 18° with the circumferential direction;

[0052] - a layer of rubber compound P1 radially outside and in contact with the first working crown ply 31 ;

[0053] - a layer of rubber compound G1 radially outside and in contact with the layer of rubber compound P1;

[0054] - radially outside the layer of rubber compound G1, a second working crown ply 32 formed of the same metal cords as those of the first working crown ply 31 forming an angle with the circumferential direction α1 oppos...

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Abstract

The invention relates to a tyre in which the crown reinforcement comprises at least three plies of reinforcing elements. According to the invention, there are: at least a first profile P1 the axially outer end of which lies a shorter distance from the equatorial plane of the tyre than the distance separating said plane from the end of a second ply, said profile P1 being radially separated from the radially outer calendering C1 of a first ply by a second profile made of rubber compound G1, at least one third profile P2 the axially outer end of which lies a shorter distance from the equatorial plane of the tyre than the distance separating said plane from the end of a third ply, said profile P2 being radially separated from the radially inner calendering C2 of said first ply by a fourth profile of rubber compound G2, said profiles of rubber compound P1, P2 and G1, G2 and said calendering C1, C2 having respective secant tensile elastic moduluses at 10% of elongation of MP1, MP2, MG1, MG2, MC1, MC2 such that MC1 = MG1 > MP1 and MC2 = MG2 > MP2.

Description

technical field [0001] The present invention relates to tires with radial carcass reinforcement, and more particularly to tires for equipping heavy-duty vehicles such as transport vehicles such as, for example, trucks, tractors, trailers or buses and coaches, or "civil works" vehicles. Background technique [0002] This type of tire, usually intended to withstand heavy loads, comprises a radial carcass reinforcement and a crown reinforcement consisting of at least two working crown plies formed by inextensible reinforcing elements crossed from one ply to the other The reinforcing elements form equal or unequal angles between 10 and 45° with the circumferential direction. [0003] More particularly for tires with very large dimensions, the crown reinforcement of a radial tire is subject to large deformations, resulting in longitudinal and transverse shear stresses between the edges of the two plies (when the cords of the crossing plies are relatively Longitudinal shear is gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C9/18
CPCB60C9/2006B60C9/185B60C2009/1842Y10T152/1081
Inventor L·邦迪
Owner OCIETE DE TECH MICHELIN
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