Michelin Recherche Et Technique S.a.

Compagnie Generale Des Etablissements Michelin

Compagnie Generale Des Etablissments Michelin

Michelin Recherche Et Techniques S.a.

Michelin Rechlin Et Techerche S.a.

Societe Detechnologie Michelin

Alain Domingo

Henri Barguet

Philippe Johnson

Emmanuel Clement

Thibaud Pottier

Franck Nugier

Brigitte Marie Chauvin

Francois-Jacques Cordonnier

Arnaud Letocart

Le Tu Anh Vo

Gilles Sallaz

Hichem Rehab

Olivier Spinnler

Robert Ciprian Radulescu

François Barbarin

Michael Cogne

Aurore Lardjane

Jacques Besson

Vincent Estenne

Sébastien Noel

Olivier Sejalon

Bopha Grisin

Christelle Chaulet

Cédric Khayat

Pascal Ragot

Le Tu Ahn Vo

Elodie Le Chenadec

Agnès Degeorges

Jean Marc D'HARCOURT

A radial pneumatic tire for a heavy-duty civil engineering vehicle aims to reduce the risk of tread separation of the pneumatic tire, during driving on sharp rocks, while ensuring good resistance to cracking of the crown reinforcement. The pneumatic tire has a protective reinforcement with two protective layers, the radially innermost protective layer having elastic metal reinforcements with a diameter D1 which are axially distributed according to an axial pitch P1, and the radially outermost protective layer has elastic metal reinforcements with a diameter D2 which are axially distributed according to an axial pitch P2. In the tire the following relations are satisfied:1&#x3e;21&#x3e;21&#x3e;=1.2*1 and2&#x3e;=1.2*22.5&#x3c;=(1*1)/(2*2)&#x3c;=5.

Protective reinforcement comprising differentiated layers for a pneumatic tire for a heavy-duty civil engineering vehicle

A hooping reinforcement of a tire for a heavy duty civil engineering type vehicle is disclosed. The crown reinforcement () of the tire (), radially on the inside of a tread (), comprises a protective reinforcement (), a working reinforcement () and a hooping reinforcement (). Said hooping reinforcement () has an axial width at most equal to the smallest axial width (L, L) of the two working layers (), and comprises at least two hooping layers () that are formed from strips each made up of elastic metal reinforcers. Each hooping layer () is made up of an axial juxtaposition of contiguous turns of the strip (), which are circumferentially wound around the working layer (). Each strip () is at least 35 mm and at most 250 mm thick, and its distributed breaking tension is at least equal to 100 daN/mm.

Hooping reinforcement for a tire of a heavy duty civil engineering vehicle

Crown of a tire for a heavy vehicle that is desensitized to attacks. The tire () comprises tread () having a median degree of surface siping TL, expressed in m/m, equal to the ratio between the cumulative length Lof the cuts (), present in a median portion of tread of axial width W, and the median area Aof the radially outer surface () of the tread (), and protective reinforcement () comprising at least two protective layers () that are formed of elastic metallic reinforcers and have a maximum breaking strength R, expressed in daN/m, such that the median degree of surface siping TLof tread () is at least equal to 5 m/mand a coupling ratio C, equal to the ratio between the maximum breaking strength Rand the median degree of surface siping TL, is at least equal to 18 000 daN.

Tire crown for a heavy duty civil engineering vehicle

The invention relates to a tire for a heavy vehicle of construction plant type, comprising a working reinforcement (), a protective reinforcement () and a hoop reinforcement (). The working reinforcement () comprises two layers () comprising inelastic metallic reinforcers that are crossed and make angles of between 30&#xb0; and 35&#xb0; with the circumferential direction, and having a force at break greater than 2500 daN. The hoop reinforcement () is formed by a circumferential winding forming two layers (), radially positioned between the working layers (), comprising circumferential elastic metallic reinforcers, having a force at break greater than 800 daN. The metallic reinforcers of the protective layers () are potentially identical to the reinforcers of the hoop reinforcement, crossed from one layer to another with angles identical to the working layers. These reinforcers are elastic, have a diameter greater than 3 mm and a force at break greater than 800 daN.

Crown reinforcement for a tire for a heavy-goods vehicle used in civil engineering

A tire includes a tread and a crown reinforcement arranged radially internal to the tread. The crown reinforcement includes a protective reinforcement and a working reinforcement. The protective reinforcement includes a protective ply that exhibits a force at break greater than or equal to 1300 daN&#xb7;cm. The protective ply includes protective reinforcing elements, each of which exhibits a force at break greater than or equal to 3000 N. The working reinforcement is arranged radially internal to the protective reinforcement and includes a working ply. The working ply includes working reinforcing elements, each of which includes a working cord formed of at least a strand that includes an external layer of unsaturated threads.

Tire for heavy industrial vehicle

The tire for a construction plant vehicle includes a tread and a crown reinforcement arranged radially internal to the tread. The crown reinforcement includes a protective reinforcement, a working reinforcement, and a hoop reinforcement. The protective reinforcement includes at least one protective ply that exhibits a force at break Fm. The working reinforcement includes at least one working ply that exhibits a force at break Fm. The hoop reinforcement includes at least one hooping ply, each of which includes hoop reinforcing elements that make an angle at most equal to 10&#xb0; with a circumferential direction of the tire. The working reinforcement is arranged radially internal to the protective reinforcement. A ratio Fm/Fmis greater than or equal to 0.27 and less than or equal to 0.90.

Tire for vehicle of construction plant type

A tire for a heavy construction-type vehicle includes a tread, a radial carcass reinforcement, and a crown reinforcement. The crown reinforcement includes a working reinforcement and a hoop reinforcement. The working reinforcement includes two working layers, each of which includes inelastic metallic reinforcers that are crossed from one layer to a next layer and that make an angle in a range of from 15&#xb0; to 40&#xb0; with respect to a circumferential direction. The hoop reinforcement, which is a ply that is wound circumferentially to form a radial stack of at least two hooping layers, includes circumferential elastic metallic reinforcers that make an angle equal to at most 2.5&#xb0; with respect to the circumferential direction. The hoop reinforcement is radially positioned between the working layers, and the circumferential metallic reinforcers of the hoop reinforcement have a force at break equal to at least 800 daN.

Crown reinforcement for a tire for a heavy-duty civil engineering vehicle

The invention relates to a tire with radial carcass reinforcement, made up of at least one layer of metal reinforcing elements, the said tire comprising a crown reinforcement, itself radially capped by a tread, the said tread being connected to two beads via two side walls, the said tire comprising a first layer of polymer compound radially between the carcass reinforcement and the radially innermost layer of reinforcing elements of the crown reinforcement. According to the invention, the said first layer of polymer compound constitutes a buffer zone designed to trap oxygen on the outside of the said first layer, the axial width of the said first layer being at least equal to 70% of the width of the radially innermost layer of reinforcing elements of the crown reinforcement.

Tire with specified arrangement of elastomeric polymer compound

A tire having a crown reinforcement formed of at least two working crown layers having unequal axial widths, a layer C of rubber mixture being positioned between at least the ends of the said at least two working crown layers, and the crown reinforcement having at least one layer of circumferential reinforcing elements positioned radially between two working crown layers. The distance d between the end of the axially narrowest working layer and the working layer separated from the axially narrowest working layer by the layer C of rubber mixture is such that 1.1&#xf8;&#x3c;d&#x3c;2.2&#xf8;, &#xf8; being the diameter of the reinforcing elements of the said at least one layer of circumferential reinforcing elements, and, in a meridian plane, the thickness of the layer C of rubber mixture is substantially uniform.

Tire comprising a layer of circumferential reinforcing elements

A tire having a radial carcass reinforcement, having at least one layer of reinforcing elements, said tire comprising a crown reinforcement, which is itself covered radially with a tread, said tread being joined to two beads via two sidewalls, wherein at least 90% of the reinforcing elements of at least one layer of the carcass reinforcement are non-wrapped metal cords having in what is called the permeability test a flow rate of less than 20 cm/min, wherein at least 1% of the reinforcing elements of said at least one layer of the carcass reinforcement are capillary tubes and wherein, in a plane of section perpendicular to the axis of the capillary tube, the ratio of the open area to the area of material is greater than 0.4%.

Tire comprising a carcass reinforcement having cables and capillary tubes

A tire comprising a crown reinforcement formed from at least two working crown layers and from at least one layer of circumferential reinforcing elements positioned radially between two working crown layers, the working crown layers adjacent to the layer of circumferential reinforcing elements being on each side of the equatorial plane and in the axial continuation of the layer of circumferential reinforcing elements coupled over an axial width, in order thereafter to be decoupled. A first additional layer of polymer blend having a width at least equal to the widthof the coupling zone and having a maximum thickness of less than two times the thickness of the layer of circumferential reinforcing elements is positioned radially under the working crown layer radially adjacent to and inside the layer of circumferential reinforcing elements and is at least partially radially superposed on the coupling zone of the working crown layers.

Heavy goods vehicle tire

The invention relates to a tire having a radial carcass reinforcement, consisting of at least one layer of metal reinforcing elements, said tire including a top reinforcement, which is covered radially with a tread, said tread being joined to two beads via two sidewalls. According to the invention, the reinforcing elements of at least one carcass reinforcement layer are metal cables which, in the so-called permeability test, have a flow rate less than 20 cm/mn and at least 10% of said metal cables are banded by a strand consisting of multifilament textile fibers.

Tire comprising banded carcass reinforcement cables

A tire comprising at least two working layers and at least one layer of circumferential reinforcing elements. The layer of circumferential reinforcing elements comprises at least a central part and two axially exterior parts, the elastic modulus of the rubber compound with which the circumferential reinforcing elements of the central part are coated being less than the modulus of the rubber compound with which the circumferential reinforcing elements of the axially exterior parts are coated.

Tire for heavy-goods vehicle

A tire with a radial carcass reinforcement made up of at least one layer of metal reinforcing elements, the tire comprising a crown reinforcement itself capped radially with a tread, the tread being connected to two beads via two sidewalls. At least 70% of the metal reinforcing elements of at least one layer of the carcass reinforcement are non wrapped cables which, in what is known as the air-wicking test, display a flow rate of less than 2 cm3/min, and at least 10% of the metal reinforcing elements of the at least one layer of the carcass reinforcement are cables which, in what is known as the air-wicking test, display a flow rate of greater than 4 cm3/min.

Tire comprising carcass reinforcement wires having different perviousnesses

A tire comprising at least two working layers and at least one layer of reinforcing elements. The layer of circumferential reinforcing elements comprises at least a central part and two axially exterior parts, the extent to which the circumferential reinforcing elements of the central part are penetrated by the rubber compound with which they are coated being less than the extent to which the circumferential reinforcing elements of the axially exterior parts are penetrated by the rubber compound with which they are coated.

Growing community of inventors

Orleat, France

Alain Domingo