Compagnie Generale Des Etablissements Michelin

Michelin Recherche Et Technique S.a.

Christopher Careme

Jose Merino Lopez

Timothy Brett Rhyne

Frédéric Perrin

José Merino Lopez

Pascal Prost

David Dean

Jacky Pineau

Patrick Pallot

Rémi Bruant

Sylvain Morival

Simona Ceccia

Jośe Merino Lopez

José Merino

A tire with improved performance in terms of grip on wet ground even when it is close to the legal wear limit. The tread comprises three layers of materials (M, M, M), radially superposed: the layer (M) is laid radially on the outside of the crown reinforcement. The layer (M) is laid radially on the outside of the layer (M), and the last layer (M) intended to be in contact with the ground is laid radially on the outside of the layer (M). The moduli of shear stiffness, G'M), G′(M), G′(M), and the viscoelastic losses Tgδ(M), Tgδ(M), Tgδ (M) of the materials of the layers satisfy the following relationships:

Tire comprising a tread optimized for grip on wet grounds in the worn condition

Tire () having a sub-layer () made up substantially of a base layer () disposed radially on the crown reinforcement () and axially between the median plane (CP) and a shoulder (), said base layer () being made up of a rubber compound of given stiffness A, a covering layer () disposed radially on the base layer () and radially on the inside of the tread () and axially at least in sections situated between the median plane (CP) and the shoulder end (), said covering layer () being made up of a rubber compound of given stiffness B, the stiffness A being less than the stiffness B, and the stiffness B being greater than the stiffness M.

Tire with a tread sub-layer containing multiple materials

A tire having an axis of rotation and a median plane (CP) perpendicular to the axis of rotation, and comprising: a crown reinforcement, a tread positioned radially on the outside of the crown reinforcement and axially between two shoulders, comprising a contact face intended to come into contact with the roadway while the tire is being driven on, wherein the tread is primarily made up of at least one rubber compound of given dynamic shear modulus M and comprises a plurality of furrows oriented substantially circumferentially, each furrow having a furrow bottom, and a sub-layer disposed radially on the outside of the crown reinforcement and radially on the inside of the tread, wherein the sub-layer is made up of at least one rubber compound of given dynamic shear modulus A is flush with each furrow bottom.

Tire having tread sub-layer flush with the groove bottom and reinforcing elements made of high modulus rubber integrated into the tread

Non-pneumatic wheel () with an annular reinforcing structure () produced from at least one elastomer compound, arranged radially on the inside of a tread (), the structure () having a plurality of reinforcing strips () arranged in layers, the strips () of each of the layers being arranged in juxtaposition in a substantially circumferential direction, the strips being coated with an elastomer composition (), the structure () made of at least three layers of strips (), wherein the strips are formed of a laminate of at least two composite layers, each composite layer has fibres coated in a polymer matrix, the fibres making an angle &#x3b1; with the circumferential direction, the difference in values of the said angles from one layer to the next being approximately 90&#xb0;.

Non-pneumatic wheel comprising a circumferential reinforcement structure

A tire, the tread of which has an underlayer and a circumferential reinforcement made up of a rubber mixture with a stiffness greater than the stiffness of the rubber mixture and the underlayer, has an outer side and an inner side. The circumferential reinforcement has a reinforcing element of tapered shape positioned in the tread pattern elements disposed axially on the outside with respect to the first or the second circumferential grooves of the tread from the outside to the inside and axially close to the circumferential groove.

Tire comprising a tread containing reinforcing elements

A tire has a sub-layer () made up substantially of a first base layer () disposed radially on the crown reinforcement () and axially between the median plane (CP) and a transition edge (), the transition edge () being situated axially between the median plane (CP) and a shoulder (), said first base layer () being made up of a rubber compound of given stiffness A, a second base layer () disposed radially on the crown reinforcement () and axially between the transition edge () and a shoulder end (), said second base layer () being made up of a rubber compound of given stiffness B, a covering layer () disposed radially on the first base layer () and on the second base layer () and radially on the inside of the tread () and axially at least in sections situated between the median plane (CP) and the shoulder end (), said covering layer () being made up of a rubber compound of given stiffness C, the stiffness B being less than the stiffness A, which is less than the stiffness C, and the stiffness C being greater than the stiffness M.

An assembly of a pneumatic tire and of a wheel, the pneumatic tire () being fitted to the wheel. The assembly comprises first and second self-sealing products housed in the internal volume (V) of the pneumatic tire (). The first self-sealing product, referred to as solid self-sealing product (OS), covers a predetermined part of the internal surface of the pneumatic tire (). The relative position of this predetermined part in the pneumatic tire () does not substantially vary under the effect of gravity. The second self-sealing product, referred to as liquid self-sealing product (OL), is in the liquid form.

Tire casing and wheel assembly comprising an enhanced self-sealing product

A method for testing a tire's resistance to pressure loss following a puncture includes inserting a plurality of puncturing objects through a wall of the tire, running the tire with the puncturing objects therein over a given distance with a regulated inflation pressure, stopping the running of the tire, and determining a pressure loss resistance index for each puncture based on an estimate of a leak rate of the puncture. In a first phase of the method, the puncturing objects are made up of pointed smooth-walled objects, such as nails, and the running is performed in such a way that the puncturing objects are not ejected during running. In a second phase of the method, the puncturing objects are made up of objects that are pointed but have walls bearing a screw thread, such as screws, and the running is performed at speeds of below 80 km/h.

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Clermont-Ferrand, France

Christopher Careme