Compagnie Generale Des Etablissements Michelin

Michelin Recherche Et Technique S.a.

Compagnie Generale Des Establissements Michelin

Compagnie Generale Des Etablissments Michelin

Emmanuel Clement

Alain Domingo

Henri Barguet

Thibaud Pottier

Marianna Chevalley

Alexandre Gianetti

Stephane Laurent

Romain Barbat

Stéphane Laurent

Rémi Pinaut

Sylvie Lhospitalier

Thierry Royer

Vincent Estenne

Olivier Sejalon

Eric Colin

Cédric Khayat

Thibault Rapenne

Pascal Ragot

Natacha Pironneau

Natalia Bellido-Vera

Pascal Chavarot

Elodie Le Chenadec

A tire () for a vehicle of the construction plant type, having a carcass reinforcement () and a crown reinforcement (), with at least five crown layers () having metal reinforcers. The protective layer () has elastic reinforcers having a tensile modulus at most equal to 110 GPa. The rubbers, referred to as crown decoupling rubbers (), that are located around the axial ends of the crown layers () have an elongation at break at least equal to 500%, and a dynamic loss tanδ at most equal to 0.06. A crown filler rubber () between the axial end of the axially widest working layer () and the carcass reinforcement () possibly has an elongation at break at least equal to 650% and a dynamic loss tanδ, at 100° C. atHz, at most equal to 0.07.

Optimized architecture of a civil engineering tire

A tire for a heavy-duty vehicle of construction plant type comprises a crown reinforcement () radially on the inside of a tread () and radially on the outside of a carcass reinforcement (). The crown reinforcement () comprises: at least one 'low-modulus' layer () formed of elastic metal reinforcers having a structural elongation at least equal to 0.4%, and a total elongation at break at least equal to 3%, and a tensile elastic modulus of between 40 GPa and 130 GPa; at least one “rigid” layer () formed of rigid metal reinforcers, the structural elongation of which is less than or equal to 0.2% and the tensile elastic modulus of which is between 140 GPa and 200 GPa. The ratio of the breaking tension of the rigid layer to that of the low-modulus layer is greater than or equal to 1.2.

Tire for a heavy civil-engineering vehicle with a simplified crown reinforcement

A two-layer multi-strand cord () has a modulus EC such that 50 GPa&#x2264;EC&#x2264;160 GPa. The cord comprises: (a) an internal layer (CI) of the cord made up of J&#x3e;1 internal strands (TI) wound in a helix having a modulus EI, each internal strand (TI) comprising: an internal layer (C1) made up of Q&#x2265;1 internal threads (F1), and an external layer (C2) made up of N&#x3e;1 external threads (F2) wound around the internal layer (C1), and (b) an external layer (CE) of the cord made up of L&#x3e;1 external strands (TE) wound around the internal layer (CI) of the cord, each external strand (TE) comprising: an internal layer (C1') made up of Q&#x2032;&#x2265;1 internal threads (F1&#x2032;), and an external layer (C2&#x2032;) made up of N&#x2032;&#x3e;1 external threads (F2&#x2032;) wound around the internal layer (C1&#x2032;).

Two-layer multi-strand cables having very low, low and medium modulus

A cord () comprises: an internal strand (TI) comprising internal layer (C) of Q=1 internal wire (F), an intermediate layer (C) of M intermediate wires (F) wound around the internal layer (C) with a pitch p, an external layer (C) of N external wires (F) wound around the intermediate layer (C) with a pitch p; and L&#x3e;1 external strands (TE) comprising an internal layer (C'), an external layer (C&#x2032;). The external layer (CE) of the cord is wound around the internal layer (CI) of the cord in a direction of winding of the cord (). Each external layer (C, C&#x2032;) of each internal and external strand (TI, TE) is wound in the same direction of winding that is the opposite to the direction of winding of the cord (). The external layer (CE) of the cord () is desaturated, and 0.36&#x2264;(p&#x2212;p)/p&#x2264;0.57.

Two-layer multi-strand cable with improved penetrability

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

A cord () comprises: an internal strand (TI) comprising an internal layer (C), and an external layer (C); and L&#x3e;1 external strands (TE) comprising an internal layer (C') of Q&#x2032;=1 internal wire (F&#x2032;), an intermediate layer (C&#x2032;) of M&#x2032; intermediate wires (F&#x2032;) wound around the internal layer (C&#x2032;) with a pitch p&#x2032;, and an external layer (C&#x2032;) of N&#x2032; external wires (F&#x2032;) wound around the intermediate layer (C&#x2032;) with a pitch p&#x2032;. The external layer (CE) of the cord is wound around the internal layer (CI) of the cord in a direction of winding of the cord (). Each external layer (C, C&#x2032;) of each internal and external strand (TI, TE) is wound in the same direction of winding that is the opposite to the direction of winding of the cord (). The external layer (CE) of the cord () is desaturated, and 0.36&#x2264;(p&#x2032;&#x2212;p&#x2032;)/p&#x2032;&#x2264;0.57.

Multi-strand cable with two layers having improved penetrability

A two-layer multi-strand cord () comprises an internal layer (CI) of the cord made up of J&#x3e;1 internal strands (TI) and an external layer (CE) of the cord made up of L&#x3e;1 external strands (TE). The cord satisfies the relationship 95&#x2264;MC&#x2264;175, where MC=(J&#xd7;MI+L&#xd7;ME)/(J+L); MI=200&#xd7;cos(&#x3b1;)&#xd7;[Q&#xd7;(D1/2)&#xd7;cos(&#x3b2;)+N&#xd7;(D2/2)&#xd7;cos(&#x3b3;)]/[Q&#xd7;(D1/2)+N&#xd7;(D2/2)]; and ME=200&#xd7;cos(&#x3b1;')&#xd7;[Q&#x2032;&#xd7;(D1&#x2032;/2)&#xd7;cos(&#x3b2;&#x2032;)+P&#x2032;&#xd7;(D2&#x2032;/2)&#xd7;cos(&#x3b4;&#x2032;)+N&#x2032;&#xd7;(D3&#x2032;/2)&#xd7;cos(&#x3b2;&#x2032;)]/[Q&#x2032;&#xd7;(D1&#x2032;/2)+P&#x2032;&#xd7;(D2/2)+N&#x2032;&#xd7;(D3&#x2032;/2)], where D1, D1&#x2032;, D2, D2&#x2032;, and D3&#x2032; are in mm, &#x3b1; and &#x3b1;&#x2032; are the helix angle of each internal and external strand (TI), &#x3b2; and &#x3b2;&#x2032; are the helix angle of each internal thread (F1, F1&#x2032;), &#x3b4;&#x2032; is the helix angle of each intermediate thread (F2&#x2032;) and &#x3b3; and &#x3b3;&#x2032; are the helix angle of each external thread (F2, F3&#x2032;).

Two-layer multi-strand cords having very low, low and medium moduli

A two-layer multi-strand cord () comprises an internal layer (CI) of the cord made up of J&#x3e;1 internal strands (TI) and an external layer (CE) of the cord made up of L&#x3e;1 external strands (TE). The cord satisfies the relationship 100&#x2264;MC&#x2264;175, where MC=(J&#xd7;MI+L&#xd7;ME)/(J+L); MI=200&#xd7;cos(&#x3b1;)&#xd7;[Q&#xd7;(D/2)&#xd7;cos(&#x3b2;)+N&#xd7;(D/2)&#xd7;cos(&#x3b3;)]/[Q&#xd7;(D/2)+N&#xd7;(D/2)]; and ME=200&#xd7;cos(&#x3b1;')&#xd7;[Q&#x2032;&#xd7;(D&#x2032;/2)&#xd7;cos(&#x3b2;&#x2032;)+N&#x2032;&#xd7;(D&#x2032;/2)&#xd7;cos(&#x3b3;&#x2032;)]/[Q&#x2032;&#xd7;(D&#x2032;/2)+N&#x2032;&#xd7;(D&#x2032;/2)], where D, D&#x2032;, D, D&#x2032; are in mm, &#x3b1; and &#x3b1;&#x2032; are the helix angle of each internal and external strand (TI), &#x3b2; and &#x3b2;&#x2032; are the helix angle of each internal thread (F, F&#x2032;), and &#x3b3; and &#x3b3;&#x2032; are the helix angle of each external thread (F, F&#x2032;).

A two-layer multi-strand cord () comprises an internal layer (CI) of the cord made up of J&#x3e;1 internal strands (TI) and an external layer (CE) of the cord made up of L&#x3e;1 external strands (TE). The cord satisfies the relationship 95&#x2264;MC&#x2264;175, where MC=(J&#xd7;MI+L&#xd7;ME)/(J+L); MI=200&#xd7;cos(&#x3b1;)&#xd7;[Q&#xd7;(D/2)&#xd7;cos(&#x3b2;)+P&#xd7;(D/2)&#xd7;cos(&#x3b4;)+N&#xd7;(D/2)&#xd7;cos(&#x3b3;)]/[Q&#xd7;(D/2)+P&#xd7;(D/2)+N&#xd7;(D/2)]; and ME=200&#xd7;cos(&#x3b1;')&#xd7;[Q&#x2032;&#xd7;(D&#x2032;/2)&#xd7;cos(&#x3b2;&#x2032;)+N&#x2032;&#xd7;(D&#x2032;/2)&#xd7;cos(&#x3b3;&#x2032;)]/[Q&#x2032;&#xd7;(D&#x2032;/2)+N&#x2032;&#xd7;(D&#x2032;/2)], where D, D&#x2032;, D, D&#x2032;, and Dare in mm, &#x3b1; and &#x3b1;&#x2032; are the helix angle of each internal and external strand (TI), &#x3b2; and &#x3b2;&#x2032; are the helix angle of each internal thread (F, F&#x2032;), &#x3b4; is the helix angle of each intermediate thread (F) and &#x3b3; and &#x3b3;&#x2032; are the helix angle of each external thread (F, F&#x2032;).

A two-layer multi-strand cord () comprises an internal layer (CI) of the cord made up of J&#x3e;1 internal strands (TI) and an external layer (CE) of the cord made up of L&#x3e;1 external strands (TE). The cord satisfies the relationship 95&#x2264;MC&#x2264;180, where MC=(J&#xd7;MI+L&#xd7;ME)/(J+L); MI=200&#xd7;cos(&#x3b1;)&#xd7;[Q&#xd7;(D1/2)&#xd7;cos(&#x3b2;)+P&#xd7;(D2/2)&#xd7;cos(&#x3b4;)+N&#xd7;(D3/2)&#xd7;cos(&#x3b3;)]/[Q&#xd7;(D1/2)+P&#xd7;(D2/2)+N&#xd7;(D3/2)]; and ME=200&#xd7;cos(&#x3b1;')&#xd7;[Q&#x2032;&#xd7;(D1&#x2032;/2)&#xd7;cos(&#x3b2;&#x2032;)+P&#x2032;&#xd7;(D2&#x2032;/2)&#xd7;cos(&#x3b4;&#x2032;)+N&#x2032;&#xd7;(D3&#x2032;/2)&#xd7;cos(&#x3b3;&#x2032;)]/[Q&#x2032;&#xd7;(D1&#x2032;/2)+P&#x2032;&#xd7;(D2/2)+N&#x2032;&#xd7;(D3&#x2032;/2)], where D1, D1&#x2032;, D2, D2&#x2032;, D3 and D3&#x2032; are in mm, &#x3b1; and &#x3b1;&#x2032; are the helix angle of each internal and external strand (TI), &#x3b2; and &#x3b2;&#x2032; are the helix angle of each internal thread (F1, F1&#x2032;), &#x3b4; and &#x3b4;&#x2032; are the helix angle of each intermediate thread (F2, F2&#x2032;) and &#x3b3; and &#x3b3;&#x2032; are the helix angle of each external thread (F3, F3&#x2032;).

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 method is provided for manufacturing a multistrand cable having a 1&#xd7;N structure and including a single layer of N strands wound in a helix. Each strand includes an internal layer of M internal threads and an external layer of P external threads. The method includes a step of individually assembling each of the N strands, during which, in chronological order, the M internal threads are wound, the P external threads are wound, and the M internal threads and the P external threads are elongated such that a structural elongation associated with the P external threads of each strand is greater than or equal to 0.05%. The method further includes a step of collectively assembling the N strands, during which the N strands are wound to form the cable.

Multi-strand cable of 1&#xd7;N structure for protective reinforcement of a tire

Multistrand metal cable of 4&#xd7;(4+M) construction, which can especially be used for reinforcing tire belts for industrial vehicles, formed from four elementary strands assembled in a helix with a helix pitch P, each elementary strand consisting of a two-layer cable of 4+M construction comprising an inner layer Cformed from four wires of diameter D, assembled in a helix with a pitch P, and an unsaturated outer layer Cof M wires, M being greater than or equal to 8 and smaller than or equal to 11, of diameter D, these being assembled in a helix with a pitch Paround the inner layer C, Pbeing smaller than P, the four wires of the inner layer Cbeing wound in a helix in the same twist direction as the M wires of the outer layer C, and wherein each of the diameters Dand Dis greater than or equal to 0.10 mm but less than or equal to 0.50 mm.

Growing community of inventors

Clermont-Ferrand, France

Emmanuel Clement