Compagnie Generale Des Etablissements Michelin

Michelin Recherche Et Technique S.a.

Compagnie Generale Des Etablissements

Olivier Ropars

Franck Nugier

Stéphane Montzieux

Pierre Tourlonias

Sylvain Bourgeade

Olivier Sejalon

Pascal Cluzel

Alexandra Curat

Arnaud Larregain

Olivier Spinnler

François Barbarin

Guillaume Demaziere

Patrick Vervaet

David Mosnier

Alexandre Carloni

Jean-Marc Ruffenach

Eric Francois

Cécile Roussel

Florence Tran

Marc Gandillet

Bruno Charasson

Alexandre Gasc

Romain Bricaud

Cecile Roussel

Pascal Falempin

Christelle Lenepveu

Vincent Pery

Istvan Matyas

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

Tread of a tire for an agricultural vehicle having each lug () extending over a radial height H in a radial direction (ZZ') from a bottom surface () to a contact face (), extending over an axial width L in an axial direction (YY&#x2032;) from an axially inner end face () to an axially outer end face (), and extending over a mean thickness E in the circumferential direction (XX&#x2032;) from a trailing face () to a leading face (). The leading face () of each lug () comprises a discontinuity () that extends circumferentially in the direction of the trailing face (), axially inwards from the axially outer end face () and radially inwards from the contact face (). The discontinuity () on the leading face () of each lug () is continued by a recess () formed in the bottom surface ().

Tread for an agricultural vehicle tire

Tire tread with main lugs extending from a tread edge to the equatorial mid-plane on each side of which are a plurality of secondary lugs () extending over 40% to 60% of the tread half-width, each secondary lug () having a width 20% to 40% of the shortest distance between two main lugs (). Each main lug () comprises, on its trailing lateral face (), a widened portion () of width Dextending over an axial distance from a tread edge and being joined to the main lug by end face () inclined at an angle Bbetween 18 degrees and 25 degrees to the circumferential direction. Each secondary lug () has end face () inclined at an angle Swith the same orientation as angle Bwith respect to the circumferential direction, angle Sbeing between 18 degrees and 25 degrees.

Agricultural vehicle tire

Tire tread

Growing community of inventors

Clermont-Ferrand, France

Olivier Ropars