Abstract: A tire for a heavy-duty vehicle of construction plant type comprises a crown reinforcement (35) radially on the inside of a tread (10) and radially on the outside of a carcass reinforcement (50). The crown reinforcement (35) comprises: at least one “low-modulus” layer (20) 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 (30) 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.

Abstract: Tire tread comprising a plurality of rubber pads, each rubber pad being delimited by an incision of depth and of closed contour, this tread having: on a first portion, of a depth at most equal to 60% of the depth of the incision, blocking means designed to limit the movements of the lateral wall relative to the wall facing it, and on a second portion of the incision, of a depth at most equal to 60% of the depth of the incision and extending the first portion of depth, geometric shapes of second amplitude or that are rectilinear (that is to say of zero amplitude), the second amplitude being less than the first amplitude, and, the first portion of the incision delimiting a first portion of pad and the second portion of the incision delimiting a second portion of pad, the maximum sectional surface area of the second portion of the pad is greater than the maximum sectional surface area of the first portion of the said pad.

Abstract: Method of designing a tire for the steered axle of a heavy goods vehicle, having a nominal sidewall height F, having a tread in the new state having a maximum total width Lo for maximum contact with the ground and provided with at least four circumferential grooves each extending between the tread surface and a groove bottom, these grooves delimiting three intermediate ribs and two edge ribs axially bounding the tread, each edge rib having two lateral walls, one of which, known as the internal lateral wall, having a height PREp measured with respect to the bottom of the groove delimiting the edge rib, this internal lateral wall having, when viewed in section on a plane containing the axis of rotation, an inclination DEp, each edge rib having a width LEp greater than the width of each of the intermediate ribs, by iteratively determining values for the dimensions LEp, PREp and DEp that satisfy the following relationship: P(LEp, DEp, PREp)<1.105769231×F, with P(LEp, DEp, PREp)=?303.528?2.00675×LEp+10.

Abstract: Tread for a tire for an axle of a heavy goods vehicle, comprising at least four grooves of generally circumferential orientation delimiting a plurality of ribs comprising two shoulder ribs axially delimiting the tread and intermediate ribs and a central rib, the intermediate and central ribs each being provided with a plurality of sipes having a width of less than 2 mm, and of generally transverse orientation, inclined at an average angle relative to a direction perpendicular to the running surface of the tread in the new state, this average angle being at least equal to 5 degrees and oriented such that the resultant force exerted, when running in the zone of contact with the road surface, by the said road surface on the tread tends to straighten out the sipes towards an average zero angle relative to this same perpendicular direction, this tread being characterized in that the following relations are satisfied: 0.660 ? ? Ai * Ac ? ? 0.755 ? ? 0.835 ? ? Ai Ae ? ? 0.

Abstract: Tread for a tire provided with a running surface intended to come into contact with the roadway when running, this tread comprising a plurality of blocks of mean axis XX? intersecting the running surface of the tread, each block, including a side wall that makes a full circuit of the block about the axis XX?. This side wall intersects the running surface at an edge with a closed geometric outline, this edge delimiting a contact surface via which the block makes contact with the roadway. The side wall of the block and the opposite wall delimit an incision, the blocks being provided on their lateral surface with at least one notch having a depth measured perpendicular to the lateral surface of the block and a width measured parallel to the lateral face of the block, the at least one notch at least partially making a circuit of the block about the axis XX?, that is to say at least over 180 degrees.

Abstract: Method of designing a tire for the steered axle of a heavy goods vehicle, having a nominal sidewall height F, having a tread in the new state having a maximum total width Lo for maximum contact with the ground and provided with at least four circumferential grooves each extending between the tread surface and a groove bottom, these grooves delimiting three intermediate ribs and two edge ribs axially bounding the tread, each edge rib having two lateral walls, one of which, known as the internal lateral wall, having a height PREp measured with respect to the bottom of the groove delimiting the edge rib, this internal lateral wall having, when viewed in section on a plane containing the axis of rotation, an inclination DEp, each edge rib having a width LEp greater than the width of each of the intermediate ribs, by iteratively determining values for the dimensions LEp, PREp and DEp that satisfy the following relationship: P(LEp, DEp, PREp)<1.105769231×F, with P(LEp, DEp, PREp)=?303.528?2.00675×LEp+10.

Abstract: Tire tread comprising a plurality of rubber pads, each rubber pad being delimited by an incision of depth and of closed contour, this tread having: on a first portion, of a depth at most equal to 60% of the depth of the incision, blocking means designed to limit the movements of the lateral wall relative to the wall facing it, and on a second portion of the incision, of a depth at most equal to 60% of the depth of the incision and extending the first portion of depth, geometric shapes of second amplitude or that are rectilinear (that is to say of zero amplitude), the second amplitude being less than the first amplitude, and, the first portion of the incision delimiting a first portion of pad and the second portion of the incision delimiting a second portion of pad, the maximum sectional surface area of the second portion of the pad is greater than the maximum sectional surface area of the first portion of the said pad.

Abstract: Tread for a tire provided with a running surface intended to come into contact with the roadway when running, this tread comprising a plurality of blocks of mean axis XX? intersecting the running surface of the tread, each block, including a side wall that makes a full circuit of the block about the axis XX?. This side wall intersects the running surface at an edge with a closed geometric outline, this edge delimiting a contact surface via which the block makes contact with the roadway. The side wall of the block and the opposite wall delimit an incision, the blocks being provided on their lateral surface with at least one notch having a depth measured perpendicular to the lateral surface of the block and a width measured parallel to the lateral face of the block, the at least one notch at least partially making a circuit of the block about the axis XX?, that is to say at least over 180 degrees.