Abstract:
A tire for heavy loads, having an inextensible radial carcass ply anchored to a bead wire to form an upturn, the end of which is located at a radial distance from the base of the bead. Each bead is reinforced by at least two additional reinforcement armatures, one armature formed of radial inextensible metallic reinforcement elements and a second armature formed of metallic elements forming an angle with the circumferential direction, the first armature being formed of at least one ply wound around the anchoring bead wire on the inside of the carcass reinforcement to form two strands, such that the axially inner strand, between the radially lower end of its radially upper edge parallel to the meridian profile of the carcass reinforcement and its point of tangency with the anchoring bead wire, follows a rectilinear trace referred to as “shortest-path”.
Abstract:
A tire with a form ratio H/S between 0.3 and 0.8 has a carcass reinforcement (1) which is covered radially by a quasi-cylindrical crown reinforcement (3) and which is tangential at T to a holding circle C. The common tangent at T to the circle C and to the meridian profile of the carcass (1) makes an angle &agr; of between +20° and −80° with respect to a line parallel to the rotation axis and passing through the tangency point T. In its portion located between the tangency point T and the point E of greatest axial width, the carcass reinforcement (1) is provided with a reinforcement armature (6) of circumferentially non-extensible elements. Viewed in meridian cross-section and when the tire is fitted and inflated to the recommended pressure, the carcass (1) has a meridian profile consisting of four circular arcs configured to improve the endurance of the tire while improving its rolling resistance.
Abstract:
Interface disc for a vehicle wheel, comprising:at least one substantially central attachment element designed to allow the said disc to be attached to a wheel;a plurality of substantially radial arms connected to the attachment elements and extending radially outwards from a substantially central portion of the said disc as far as a substantially peripheral portion of the said disc;an energy absorption surface collaborating with the said arms and configured to form a wall between the said substantially central portion of the disc and its substantially peripheral portion;at least one circumferential reinforcing element collaborating with the said arms and the modulus of which is substantially higher than that of the energy absorption element.
Abstract:
Tire, comprising at least one carcass-type reinforcement structure extending circumferentially from the bead to the sidewall and a crown reinforcement, each of the beads further comprising a main anchoring zone for supporting the reinforcement structure, the tire comprising a rim protector provided by a rubber projection extending axially outwardly relative to the sidewall and comprising at least one secondary anchoring zone comprising a plurality of circumferential cord windings, the windings cooperating with an adjacent portion of a secondary reinforcement structure via a rubber anchoring mix. Since anchoring is distributed between the bead and the rim protector, new architectural or design possibilities are opened up, for example permitting the use of the restricted space of the bead in an optimum manner. Thus, for example, the presence of the secondary anchoring zone at the rim protector helps greatly to improve the behavior of the tires, in particular resistance to drift.
Abstract:
A tire comprising at least one reinforcement structure of carcass type anchored on each side of the tire in a bead, a crown reinforcement, each bead being extended radially towards the outside by a sidewall, said reinforcement structure being discontinuous over at least a portion of the crown of the tire, said crown reinforcement comprising on the one hand at least one primary reinforcement structure covering substantially the entire width of the crown and comprising on the one hand, on each side of the tire, a lateral primary reinforcement structure portion disposed radially outside the adjacent carcass-type reinforcement structure portion and on the other hand a median primary reinforcement structure portion disposed radially more to the inside than the lateral primary reinforcement structure portions and at least one substantially axial row of median circumferential reinforcements disposed radially to the outside, substantially adjacent the median primary reinforcement structure portion.
Abstract:
Interface disc for a vehicle wheel, comprising: at least one substantially central attachment element designed to allow the said disc to be attached to a wheel; a plurality of substantially radial arms connected to the attachment elements and extending radially outwards from a substantially central portion of the said disc as far as a substantially peripheral portion of the said disc; an energy absorption surface collaborating with the said arms and configured to form a wall between the said substantially central portion of the disc and its substantially peripheral portion; at least one circumferential reinforcing element collaborating with the said arms and the modulus of which is substantially higher than that of the energy absorption element.
Abstract:
A tread is provided with at least one rubber stud of orientation XX′ perpendicular or inclined with respect to the tread surface. The rubber stud has a side wall bounded by at least one incision and an outer end wall. The stud is joined to the tread at its base (the rubber stud part located farthest inward on the tread) and by at least one rubber connecting element joining the side wall of said stud to the rest of the tread. The projected length, on the tread surface in new condition and in the direction XX′, of the principal geometrical lines of the surfaces of intersection of all the connecting elements of each rubber stud, represents at least 80 percent of the contour perimeter, measured on the same surface, of each rubber stud. Preferably, the principal geometrical lines bounding the surfaces of intersection of the connecting elements are in the form of helixes around XX′, and the projected length of said lines is equal or close to 100 percent of the perimeter.
Abstract:
A molding element designed to mold a cut in a rubber article, such as a tire, and in which the cut has a geometry of rotation on an axis XX′. The molding element has a head extended by a molding part intended to project into the molded surface in order to mold at least one cut in the rubber article. The head is mounted for rotation in a mold member, and the head contains at least one circular cylinder of axis XX′ defining the main axis of the molding element, and cooperates with mold member in order to permit a rotation on XX′ relative to the mold, when the molding part of the molding element is subjected either to a force acting in direction XX′ or to a torque about the same direction XX′.
Abstract:
A tire comprising at least one reinforcement structure of carcass type anchored on each side of the tire in a bead, a crown reinforcement, sidewalls meeting up radially towards the outside with a tread, the carcass-type reinforcement structure extending circumferentially from the bead towards said sidewall and being discontinuous over at least a portion of the crown of the tire, said crown reinforcement comprising on the one hand at least one primary reinforcement structure covering substantially the entire width of the crown and on the other hand at least one series of circumferential reinforcements also covering substantially the entire width of the crown, said series of circumferential reinforcements comprising a portion of lateral circumferential reinforcements disposed radially to the outside relative to said primary reinforcement structures and a portion of median circumferential reinforcements disposed radially to the inside relative to said primary reinforcement structures.
Abstract:
A tire having a radial carcass reinforcement, anchored in each bead to an anchoring bead wire to form an upturn, characterized in that a profiled member of vulcanized rubber mix is arranged axially to the outside of the upturn of the carcass reinforcement, the secant modulus of elasticity in tension of which, measured for a relative elongation of 10%, is very much greater than the moduli of the other mixes forming the bead, the main part of the carcass reinforcement having a substantially rectilinear meridian profile between its point of tangency to the anchoring bead wire and a point A located at a radial distance HA from the base D of the beads of between 35% and 65% of the radial distance HE between the points of maximum axial width of the carcass reinforcement and said base D.