Compagnie Generale Des Etablissements Michelin

Michelin Recherche Et Technique S.a.

Compagnie Generale Des Etablissments Michelin

Franck Nugier

Olivier Ropars

Olivier Spinnler

Arnaud Larregain

Alain Domingo

Murielle De-Tullio

Adrien Traverse

Frédéric Massis

Stéphane Montzieux

Dominique Chauvin

Xavier Neau

Vincent Lemineur

François Harle

Cécile Roussel

Christelle Lenepveu

Valérie Feuardent

Tire

A tire tread () for a heavy construction plant vehicle, and aims to improve both its ability to not retain stones in its voids, during off-road use, and its ability to dampen the noise that it generates, during on-road use. At least one longitudinal groove () of the tread () has a longitudinal distribution of protuberances (), and any protuberance () has a height H' at least equal to 0.9 times the depth H of the groove () and has a first portion (), having a height H1, a width W1 and a thickness T1, and a second portion (), having a height H2, a width W2 and a thickness T2, satisfying the relationships: H′=H1+H2, 0.6*H′<=H2<=0.9*H′, W2>=0.25*W, T2<=min(3 mm; 1/3*T1), W1>=0.5*W, T1>=H1.

Pneumatic tire tread for a heavy duty vehicle comprising stone-expelling and noise-preventing protuberances

A Tire tread with blocks for a heavy construction-plant vehicle, to improve the compromise between traction on muddy ground and lifetime in terms of wear on rough ground. A tread () has blocks (), which are separated by cuts () and raised with respect to a bottom surface (). Any block () have a contact face () having a polygonal shape of surface area SC, which is contained in a tread surface (), lateral faces (), and a base section (), which has a polygonal shape of surface area SB. The contact face () of any block () has a polygonal shape that is at least partially concave, wat least two consecutive sides () that form between them an interior angle Aof the polygonal shape that is greater than 180° and the surface area SC of the contact face () is at most equal to 0.9 times the surface area SB of the base section ().

Tire tread for a heavy construction-plant vehicle

Tire () for an off-road vehicle, comprising a crown and a tread () having a width W and a thickness E of wearable material, this tread () having a superposition of at least two layers of materials, a first layer () radially on the inside and a second layer () radially on the outside of the first layer () to contact the ground when the tire is new, this second layer () having a thickness E2 relative to the thickness E of wearable material, the tread () being provided with at least two narrow grooves () running all around the tire which have a zigzagging shape of wavelength L and amplitude A, the wavelength L being between 10% and 120% of the axial width W of the tread (), and the amplitude A being between 10% and 75% of axial width W. The material of the first layer () is chosen with low hysteresis; with a measured tan(δ) value at most equal to 0.30.

Tire for off-road vehicle having improved endurance

Tread () of a tire for an off-road vehicle, with total width (W) and total thickness of wearable material at least equal to 60 mm. The tread is delimited axially by shoulder regions () provided with grooves (). This tread () comprises, in central region (), narrow groove () and, between each shoulder region () and the central region (), an intermediate region () in which there are formed a plurality of oblique or transverse narrow grooves (). Narrow groove () of the central part is made up of first narrow-groove parts () of depth (P) and of second narrow-groove parts () of depth (P). Depth (P) is greater than depth (P). Narrow grooves () of one same intermediate region comprise, in the circumferential direction, an alternation of narrow grooves () of first depth (P) and of narrow grooves () of second depth (P).

Tire tread comprising cutouts of different depths

The tread has a wearable thickness of material EMU and has raised elements delimited by grooves. Each solid part has a contact face and a cavity with a depth greater than 50% of the wearable thickness. Each cavity opens onto the contact face when new and is delimited by a wall surface and a bottom surface. Each wall surface deliminates a cavity that intersects the contact face along a corner edge contour that has a geometry that has a major axis which is at least 1.5 times the length of a minor axis when new. For any tread surface down to a predefined wear level, the level is at most 30% of the wearable thickness of material EMU, and the angle between the major axis and the circumferential direction is between 0 and 40 degrees. After the wear level, the angle is greater than 40 degrees.

Tread comprising voids for civil engineering vehicle tire

Tire tread

Growing community of inventors

Clermont-Ferrand, France

Franck Nugier