Compagnie Generale Des Etablissements Michelin

Michelin Recherche Et Technique S.a.

Compagnie Generale Des Establissements Michelin

Compagnie Generale Des Etablissements

David Dean

Frédéric Perrin

Bernard Villeneuve

Pascal Prost

Emmanuel Igier

Christopher Careme

Maxime Pras

Christian Gomet

Philippe Souyri

Christophe Laurent

Jean-Michel Vacherand

Damien Blouin

David Lavialle

Guillaume Hennebert

Johan Ferri

A rubber caterpillar track () has an interior surface () intended to collaborate with drive means, and a tread () comprising a tread pattern () formed of N relief elements made of an elastomeric material which are intended to come into contact with the ground in order to give the caterpillar track () traction, each element of the tread pattern () comprising a leading face () intended to transmit force, characterized in that: a. the leading face of n tread pattern elements, the number n being at least equal to 0.2×N, is inclined with respect to a direction (OZ) normal to the bearing surface by an angle α comprised between 45 degrees and 75 degrees; and b. the tread is notably made of an elastomeric material of which the shore A hardness, measured in accordance with the standard ASTM D2240, is greater than or equal to 65.

Tread of a vehicle track

A tread () for the driven axle of an agricultural vehicle having tread pattern elements () extending radially towards the outside from a bearing surface (). The tread pattern elements have, in the central part of the tread, a series of blocks () juxtaposed with one another in the longitudinal direction and separated by transverse cuts (), and having, in the rolling direction (), a leading face, a contact face and a trailing face. The leading face having a radial height greater than the radial height of the trailing face. The contact face being oriented at an angle α with respect to radial direction Z, α being between 93 and 105° and radial depth PR of the transverse cuts () being at least 50% of the radial height of the leading face, the width of the blocks representing at least 15% of the width of the tread.

Tread for an agricultural vehicle

A tire for an agricultural vehicle, having a tread made of rubbery material and two axially outer zones delimiting the tread, each having a shoulder and a sidewall and designed to mechanically connect the tread to a rim. The tire has a plurality of blocks distributed in a circumferential direction (X), each block having a length L, measured in the circumferential direction (X) from a lateral face of the block, and a height H, where L is greater than H. Each block has a cavity that opens onto the lateral face, forming an opening in the lateral face. The cavity has a depth p and an opening width l. The blocks are present in at least one of the two axially outer zones, but not in the tread. The blocks are present at the shoulder in the continuation of the tread.

Tire for an agricultural vehicle, the tire comprising a tread

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 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.

A tire () comprises a sidewall () and an attachment bead () extending the said sidewall () and designed to be attached to a rim of a wheel of a motor vehicle. A mould () for vulcanizing a tire comprises a lateral part () designed to mould the sidewall () of the tire and a lower partdesigned to mould the attachment bead (). The lateral partand the lower partat least partially delimit a tire receiving space (E) designed to receive the tire that is to be vulcanized in the mould (). The mould comprises a slot () extending the tire receiving space (E) and the slot () is at least partially moulded by the lower partof the mould ().

Mold for vulcanizing a tire

A mold for vulcanizing and molding a tire, this tire having a tread delimited by two sidewalls, the mold having a ring for molding the tread of the tire and two shells for molding the sidewalls, the mold having an annular groove extending in a recessed manner in one of the shells and an insert housed in the groove, this insert including at least one groove which is concentric with the insert and provided with a section that decreases in the depthwise direction of the groove.

Mold for tire having an annular insert with a concentric groove

An assembly including a tire having beads, said bead axially including outside the turn-up a layer of a material defining a bead outer profile, such that the distance A, between the carcass frame and the bead outer profile, is as defined in formula (Z), B being the distance between the end of the turn-up, said bead including first and second profiles between the carcass frame and the turn-up, the first profile extends from the bead wire and is made of a material having an extension secant modulus at a 10% elongation higher than 20 MPa, a second profile arranged in the bead such as to be in contact with a surface of the first profile and the turn-up, made of a material having an extension secant modulus at a 10% elongation of at least 7 MPa and an extension secant modulus at a 100*% extension of at least 4.5 MPa.

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Clermont-Ferrand, France

David Dean