Michelin Recherche Et Technique S.a.

Compagnie Generale Des Etablissements Michelin

Compagnie G&eacute;n&eacute;rale Des Etablissements Michelin & Cie

Societe Detechnologie Michelin

Lucien Bondu

Olivier Goncalves

Cecile Belin

Francois Harle

Philippe Gervais

François Harle

Cécile Belin

Stèphane Callamand

Tire () for a heavy vehicle of construction plant type with tread () comprising raised elements (), separated by grooves (), extending radially outwards from a bottom surface () as far as a contact face () over a height (H) and comprising base compound () and coating compound (). Coating compound () has a constant maximum thickness (e), at the contact face () of each raised element (), at most equal to 0.15 H, the coating compound () has a constant minimum thickness (e), at each groove bottom (), at least equal to 0.04 H, and the elongation at break at 23&#xb0; C. Aof the coating compound () is at least equal to 1.05 times the elongation at break of 23&#xb0; C. Aof the base compound ().

Tire tread for heavy vehicle of construction plant tire

The invention relates to improving the endurance of the beads of a radial tire for a heavy vehicle of construction plant type by reducing the cracking that starts on the axially outer face of the turn-up and spreads through the polymer coating and filler materials. According to the invention, a transition element made of a polymer transition material, is in contact, via its axially inner face, with the polymer coating material of the axially outer face of the turn-up and, via its axially outer face, with the polymer filler material, and the elastic modulus at 10% elongation of the polymer transition material is somewhere between the respective elastic moduluses at 10% elongation of the polymer coating material and of the polymer filler material.

Heavy vehicle tire with specified carcass turn-up, bead protection element, bead filler element, and bead transition element

A tire with a radial carcass reinforcement, having a crown reinforcement, itself capped radially by a tread connected to two beads by two sidewalls, the tread containing at least two layers of blended elastomeric compounds that are radially superposed and have a voids ratio that is lower in the central part than at the axially outer parts. A first layer of blended elastomeric compounds of the tread is made up of a first blended elastomeric compound forming a part extending at least into the region of the equatorial plane and of at least two axially outer parts formed of a second blended elastomeric compound, the first blended elastomeric compound having a macro dispersion Z-value higher than 65 and a maximum tan(&#x3b4;) value, denoted tan(&#x3b4;)max, lower than 0.150, and the elongation at break in a tearability test of the second blended elastomeric compound at 100&#xb0; C. having a value at least 10% higher than that of the elongation at break of the first blended elastomeric compound in a tearability test at 100&#xb0; C.

Tire comprising a tread formed by multiple elastomer blends

A tire with a radial carcass reinforcement, having a crown reinforcement, itself capped radially by a tread connected to two beads by two sidewalls, the tread having at least two layers of blended elastomeric compounds that are radially superposed and have a voids ratio that is lower in the central part than at the axially outer parts. A first layer of blended elastomeric compounds of the tread is made up of a first blended elastomeric compound forming a part extending at least into the region of the equatorial plane and of at least two axially outer parts formed of a second blended elastomeric compound, the first blended elastomeric compound having a macro dispersion Z-value higher than 65 and a maximum tan(&#x3b4;) value, denoted tan(&#x3b4;)max, lower than 0.120, and the complex dynamic shear modulus G* 1% at 100&#xb0; C. of the second blended elastomeric compound having a value at least 10% higher than that of the complex dynamic shear modulus G* 1% at 100&#xb0; C. of the first blended elastomeric compound.

A tire of which the tread contains at least two layers of blended elastomeric compounds that are radially superposed and have a voids ratio that is lower in the central part than at the axially outer parts. A first layer of blended elastomeric compounds of the tread is made up of a first blended elastomeric compound forming a part extending at least into the region of the equatorial plane and of at least two axially outer parts formed of a second blended elastomeric compound, the first blended elastomeric compound having a Z-value higher than 55 and a tan(&#x3b4;)max value lower than 0.120, the second blended elastomeric compound having a Z-value higher than 50 and a tan(&#x3b4;)max value lower than 0.100, and the complex modulus G*1% at 100&#xb0; C. of the second blended elastomeric compound having a value at least 5% higher than that of the modulus G*1% at 100&#xb0; C. of the first blended elastomeric compound.

A tire with a radial carcass reinforcement, having a crown reinforcement, itself capped radially by a tread connected to two beads by two sidewalls, the tread having at least two layers of blended elastomeric compounds that are radially superposed and have a voids ratio that is lower in the central part than at the axially outer parts. A first layer of blended elastomeric compounds of the tread is made up of a first blended elastomeric compound forming a part extending at least into the region of the equatorial plane and of at least two axially outer parts formed of a second blended elastomeric compound, the first blended elastomeric compound having a macro dispersion Z-value higher than 65 and a maximum tan(&#x3b4;) value, denoted tan(&#x3b4;)max, lower than 0.150, and the second blended elastomeric compound having a maximum tan(&#x3b4;) value, denoted tan(&#x3b4;)max, lower than 0.130.

A tire of which the tread contains at least two layers of blended elastomeric compounds that are radially superposed and has a voids ratio that is lower in the central part than at the axially outer parts thereof. A first layer of blended elastomeric compounds of the tread is made up of a first blended elastomeric compound forming a central part, and of two outer parts formed of a second blended compound, the first blended compound having a Z-value higher than 55, the first blended compound and the second blended compound having a tan(&#x3b4;)max value lower than 0.110, the modulus G* of the second blended elastomeric compound having a value at least 10% higher than that of the modulus G* of the first blended elastomeric compound, a second layer of the tread, radially the outermost, being made up of a third blended compound of which the modulus G* has a value at least 10% higher than that of the modulus G* of the first blended elastomeric compound and the elongation at break of the third blended compound having a value at least 10% higher than those of the elongations at break of the first and second blended compounds.

The invention relates to improving the endurance of the beads of a radial tire for a heavy vehicle of construction plant type, by reducing the cracking that starts at the surface of contact between a first polymer filling material that is radially furthest towards the inside and in contact with the bead wire and a second polymer filling material that is radially on the outside of the first polymer filling material. According to the invention, a transition element, made of a polymer transition material, is in contact, via its radially inner face, with the first polymer filling material and is in contact, via its radially outer face, with the second polymer filling material, and the elastic modulus at 10% elongation of the polymer transition material is somewhere between the respective elastic moduluses at 10% elongation of the first and second polymer filling materials.

Bead of a tire for a heavy vehicle of construction plant type

The invention relates to improving the endurance of the beads of a radial tire for a heavy vehicle of construction plant type by reducing the cracking that starts at the end of the turn-up and spreads through the polymer coating, edging and filling materials. According to the invention, a transition element, made of a polymer transition material, is at least partially in contact, on its axially outer face, with the polymer edging material and, on its axially inner face, with a polymer filling material, the radially outer and radially inner ends of the transition element are respectively radially on the outside and radially on the inside of the end of the turn-up and the elastic modulus at 10% elongation of the polymer transition material is somewhere between the respective elastic moduluses at 10% elongation of the polymer edging material and of the polymer filling material with which the transition element is in contact.

Technique for improving the endurance of beads of a radial tire for a heavy vehicle of the civil engineering type, by blocking the cracks that are initiated in the carcass reinforcement upturn end zone and that are propagated in the surrounding polymer materials, causing the deterioration of the bead over time. A binding element (), having at least two layers of binding including reinforcement elements made of textile material, is in continuous contact with the carcass reinforcement upturn () between a first point of contact (A) on the axially inner face () of carcass reinforcement upturn, corresponding to a first end (I) of the binding element, and a last point of contact (B) on the axially outer face () of the carcass reinforcement upturn.

Tire bead for heavy civil engineering vehicle

Technique for improving the durability of the beads of a radial tire for a heavy vehicle of the civil engineering type, by reducing the rate of spread of cracks initiated at the surface of contact between a first filler polymer material () which is radially innermost and in contact with the bead wire core () and a second filler polymer material () radially on the outside of the first filler polymer material. A transition element (), made of a transition polymer material, of contact thickness (e), is in contact, via its radially internal face (), with the first filler polymer material () and in contact, via its radially external face (), with the second filler polymer material (), and the elastic modulus at 10% elongation of the transition polymer material is somewhere between the respective elastic moduli at 10% elongation of the first and second filler polymer materials.

A technique for improving the durability of the beads of a radial tire for a heavy vehicle of the civil engineering type, by reducing the rate of spread of cracks initiated at the turned-back end of carcass reinforcement and the spread through the coating, edge-binding and filler polymer materials. A transition element (), made of a transition polymer material, is at least partially in contact, on its axially external face, with the edge-binding polymer material () and, on its axially internal face, with a filler polymer material (), the radially external (E) and radially internal (I) ends of the transition element are respectively radially on the outside of and radially on the inside of the end of the turned-back portion of carcass reinforcement, and the elastic modulus at 10% elongation of the transition polymer material is somewhere between the respective elastic moduli at 10% elongation of the edge-binding polymer material and of the filler polymer material with which the transition element is in contact.

Tire bead for a heavy civil engineering vehicle

A tire with a crown reinforcement that comprises at least three plies of reinforcing elements. At least a first profiled element Phas an axially outer end that is situated at a distance from the equatorial plane of the tire which is less than the distance separating the plane from the end of a second ply. The profiled element Pis radially separated from the radially outer liner Cof a first ply by a second profiled rubber compound element G. At least a third profiled element Phas an axially outer end that is situated at a distance from the equatorial plane of the tire which is less than the distance separating the plane from the end of a third ply. The profiled element Pis radially separated from the radially inner liner Cof the first ply by a fourth profiled rubber compound element G. The profiled rubber compound elements P, Pand G, Gand the liners C, Chave respective tensile secant moduli of elasticity at 10% elongation MP, MP, MG, MG, MC, MCsuch that MC&#x2267;MG&#x3e;MPand MC&#x2267;MG&#x3e;MP

Heavy goods vehicle tire

A heavy vehicle tire comprising at least four working plies formed of reinforcing elements which, from one ply to the next, cross one another, and comprising at least one protective ply. The tire is supplemented on each side of the circumferential mid-plane by a single working half-ply the reinforcing elements of which make an angle greater than 30&#xb0; with the circumferential direction, the half-ply being radially on the inside of and adjacent to the radially outermost continuous working ply, its axially outer end being axially on the outside of the ends of the continuous working plies, and the reinforcing elements of the half-ply, the reinforcing elements of the radially outermost continuous working ply and the reinforcing elements of the protective ply the end of which is axially on the outside of the ends of the working plies being oriented in the same direction.

Tire for heavy vehicle

Method of processing data in a vehicle tire monitoring system. For a first given period of time, referred to as the reference period, a device calculates, for each class of temperature supplied, the corresponding mean pressure in a given tire. Then, for at least a second given period of time, the device calculates, for each class of temperature supplied, the corresponding mean pressure and the difference between this mean pressure and the reference mean pressure, and the device calculates the mean value of these differences.

Growing community of inventors

Clermont-Ferrand, France

Lucien Bondu