Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
  • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
  • B60C15/06—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
  • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
  • B60C15/0009—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion
  • B60C15/0018—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion not folded around the bead core, e.g. floating or down ply
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
  • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
  • B60C15/0009—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion
  • B60C15/0027—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion with low ply turn-up, i.e. folded around the bead core and terminating at the bead core
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T152/00—Resilient tires and wheels
  • Y10T152/10—Tires, resilient
  • Y10T152/10495—Pneumatic tire or inner tube
  • Y10T152/10819—Characterized by the structure of the bead portion of the tire
  • Y10T152/10837—Bead characterized by the radial extent of apex, flipper or chafer into tire sidewall

Definitions

• the invention relates to radial carcass reinforcement tires intended to equip heavy goods vehicles and even more particularly the bead structure of these tires.
• a truck tire comprises a crown portion surmounted radially outwardly of a tread intended to come into contact with the roadway, this crown portion being extended on either side by sidewalls ending with bulges.
• a tire comprises a plurality of reinforcement reinforcements including a carcass reinforcement whose role is to withstand the forces of the tire internal inflation pressure. This carcass reinforcement extends into the top, the flanks of the tire and is anchored at its ends to appropriate anchoring structures located in the beads.
• the carcass reinforcement is generally composed of a plurality of reinforcements arranged parallel to each other and making an angle close to or equal to 90 degrees with the circumferential direction (in this case, the carcass reinforcement is said to be "radial” ).
• the anchoring of the carcass reinforcement is most often carried out by turning around an anchoring structure having a suitable circumferential rigidity, to form axially outside a turning part whose length, measured for example relative to at the point radially the innermost of the anchoring structure, is chosen to ensure satisfactory endurance of the tire in use. Axially between the turning part and the carcass reinforcement, there is one or more elastomer-based materials providing mechanical coupling of the two parts of the carcass reinforcement.
• this tire is mounted on a mounting rim comprising rim seats intended to be in contact with the radially innermost portions of the beads and, axially on the outside of each seat, a rim rim for fixing the axial position of said bead when the tire is mounted and inflated to its nominal pressure.
• cyclic circumferential movement reinforcements reinforcements of the carcass ply in the flanks and beads of the tire.
• cyclic circumferential movement is meant here that the displacement is in one direction and in the opposite direction to each turn of the wheel around an average equilibrium position.
• the rolling generates in the materials constituting the bead, in particular in the elastomeric materials and more particularly in those which are located in the immediate vicinity of the ends of the reinforcements (end of the turned part of the carcass reinforcement or ends of the additional reinforcements ) stresses and / or deformations that can lead to a more or less significant reduction in the duration of use of the tire.
• the present invention aims to prevent the risk of degradation of the bead by providing a bead structure having a sufficient rigidity to withstand the bending forces and circumferential movements of the frames during rolling while being easy to implement.
• the inventors have set themselves the objective of seeking a powerful solution vis-à-vis the stresses described above during the rolling of the tire while being relatively easy to implement and economically attractive on an industrial level.
• a tire for heavy vehicle comprising a tread extended transversely on both sides by flanks ending in beads for cooperating with a mounting rim.
• this tire comprises a radial carcass reinforcement formed of a plurality of directionally oriented reinforcements making an angle at least equal to 80 degrees with the circumferential direction.
• This carcass reinforcement is anchored in each of the beads to an anchoring structure comprising a circumferential reinforcing reinforcement around which is formed a coating profile whose contour of the meridian section comprises a portion radially inside. and a portion radially outwardly, these two parts being connected at two points axially furthest from the contour of said coating profile.
• this carcass reinforcement is partly wound around the embedding profile of the anchoring structure passing from the inside of the tire to the outside, the end of this carcass reinforcement being located on or near the contour of the encasing profile.
• This tire further comprises a first binding frame formed of a plurality of reinforcements oriented in a direction at an angle greater than or equal to 70 degrees to the circumferential direction.
• This first connecting reinforcement comprises a first part in contact with the carcass reinforcement between a point P1 radially outwardly with respect to the point of the contour of the coating profile of the radially outermost anchoring structure.
• this first binding armature extending beyond the end of the armature of carcass by a second portion in contact with the coating profile to a point P2 located on the portion radially outside the contour of the encasement profile.
• This tire further comprises a second binding armature wrapping the first binding armature and passing radially under the wrapping profile radially inside said first binding armature to form an internal strand and an external strand, the inner strand being located axially inwardly with respect to the carcass reinforcement and the outer strand being located axially outside said carcass reinforcement; the inner strand is in contact on a length Vl with the carcass reinforcement between a first end point D1 of said first strand and the end point P1 of the first binding armature, the outer strand being in contact with the carcass reinforcement from a point D20 to an end point D2 of the outer strand over a length V2, the points D1 and D2 being located radially beyond the end points P1, P2 of the first reinforcement of link.
• This second binding frame is formed of a plurality of reinforcements oriented in a mean direction at an angle at most equal to 50 degrees with the circumferential direction.
• the distance Yl separating the radially outermost end of the first strand of the second binding frame and the point of the reinforcing structure of the anchoring structure the most the radially interior is at least 15 per cent and not more than 40 per cent of the radial distance between the point of the outermost radially carcass reinforcement and the point of the same radially carcass reinforcement the most inside.
• the contact length of the first strand of the second bonding armature is at least 20 percent of the distance separating the radially outermost end of the internal strand of the second bonding armature and the point of the circumferential reinforcement reinforcement of the radially innermost anchoring structure.
• the contact length of the outer strand of the second connecting armature is at least equal to 15 percent of the distance separating the radially outermost end of the outer strand of the second binding armature and the point of the circumferential reinforcing reinforcement of the innermost anchoring structure radially.
• Figure 3 shows another variant in which the second connecting armature is formed of two parts superimposed locally;
• Figure 4 shows another variant in which the first connecting armature is placed between the bead anchor structure and the carcass reinforcement.
• the tire 1 according to the invention is reinforced by a radial carcass reinforcement 10 consists of a plurality of metal cables formed of several elementary son 18/100 mm. These cables are embedded in an elastomeric mixture and are oriented substantially in a radial direction.
• this anchoring structure comprising a coating profile 22 encasing a circumferential reinforcing reinforcement 21 (in this case, the reinforcing structure is a bead wire composed of a plurality of coiled metal wires circumferentially).
• the carcass reinforcement follows the meridian profile of part of the contour of the encasement profile 22 and is mechanically coupled to this adhesion section by adhesion of the material constituting the encasement profile and the material coating the reinforcements of the encapsulant. carcass reinforcement.
• the encasement profile 22 has a contour comprising a portion radially on the inside 221 and a radially outward portion 222, said portions meeting at points N1, N2 axially furthest from the contour of said coating profile.
• a first binding reinforcement 30, formed of a plurality of reinforcements oriented in a direction at an angle greater than or equal to 70 degrees to the circumferential direction comprises a first portion 31 in contact with the carcass reinforcement 10 between a point P1 radially outwardly relative to the point N3 of the contour of the radially outermost encapsulating profile 22 and the end point C of the carcass reinforcement, this first connecting armature 30 extending beyond the end point C of the carcass reinforcement by a second portion 32 in contact with the coating profile 22 to a point P2 located on the part radially outside 222 of the contour of the encasement profile 22.
• This tire further comprises a second connecting armature 40 enveloping the first connecting armature 30, this second armature passing radially inside the coating profile 22 and radially inside the first binding armature 30 to form an internal strand 41 and an outer strand 42, the inner strand 41 being located axially inwardly with respect to the carcass reinforcement 10 and the outer strand 42 being situated axially on the outside with respect to the reinforcement of the carcass 10.
• the internal strand 41 of the second connecting armature 40 is in contact on a length Vl with the carcass reinforcement between a first end point D1 of said inner strand 41 and the end point P1 of the first binding reinforcement 30, the strand outer member 42 being in contact with the carcass reinforcement from a point D20 to an end point D2 of the outer strand 42 over a length V2.
• the points D1 and D2 are located radially beyond the end points P1, P2 of the first connecting armature 30.
• the second connecting armature 40 is formed of a plurality of reinforcements (here metal cables to base unit son diameter 0.35mm) embedded in an elastomer-based composition, these reinforcements being oriented in a mean direction at an angle at most equal to 50 degrees with the circumferential direction and even more preferably an angle at least equal to 20 degrees and at most equal to 30 degrees (in this case: 30 °).
• the choice of these angle values also has the effect of facilitating the manufacture and in particular the turning around the anchoring structure.
• the reinforcements of the first and second bonding armatures are identical and may be chosen from reinforcements of a textile or metal nature (for example: 167x3 aramid reinforcements) (0045)
• the end C of the carcass reinforcement is located radially inside the inner portion 221 of the embedding profile 22 of the anchoring structure and axially between the points N1, N2 of the contour of said coating section axially furthest away.
• the distance Y2 separating the radially outermost end of the outer strand 42 from the second connecting reinforcement 40 and the point A of the reinforcing structure of the circumferential reinforcing reinforcement (21) the most radially inside is equal to 63 mm or 45% of the radial distance between the point of the radially outermost carcass reinforcement and the point of the same radially innermost carcass reinforcement (this radial distance here being equal to 140 mm).
• the distance Yl separating the radially outermost end of the first strand 41 from the second connecting reinforcement 40 and the point A of the reinforcement structure of the most important anchoring structure radially inside is equal to 50 mm or 35% of the radial distance between the point of the carcass reinforcement radially outermost and the point of the same radially innermost carcass reinforcement.
• the decoupling lengths W1 and W2 respectively are preferably greater than 5 mm.
• the second connecting armature 40 is formed of a first strand 41 and a second strand 42, said strands 41 and 42 partially overlapping radially on the inside of the profile. coating the anchoring structure and axially inward with respect to the end point C of the carcass 10.
• the meridional length Lc of the superposition zone between the first and second strand is at least equal to half the axial distance separating the axially furthest points Nl and N2 of the anchoring structure 20.
• the distance separating the points Nl, N2 axially furthest away of the anchoring structure is equal to 20 mm while the length of the superposition zone is equal to 10 mm.
• the points N1 and N2 are respectively determined by constructing tangents to the encapsulation profile 22, said tangents being perpendicular to the axis of rotation XX '.
• the reinforcing reinforcement of the anchoring structure is a rod 21 of substantially circular cross-section (braided type rod, that is to say formed by helical winding of several son around a circular soul).
• This rod 21 is surrounded by a rubber profile 22 which is obtained by a rubber mixture winding of almost constant thickness around the bead wire.
• the outer contour of the encasement profile 22 seen in meridian section is then substantially circular.
• a first connecting armature 30 is wound; this first armature 30 is extended radially outwards by an armature portion 31 located axially between the carcass reinforcement 10 and the profile 60 of substantially triangular section, this section serving as a decoupling between the carcass reinforcement 10 and the part 42 axially outside the second connecting armature 40.
• the end point P2 of the connecting armature 30 is located on the contour of the anchoring structure 20 very close to the point of tangency of the part d frame 31 with said anchoring structure.
• the second connecting armature 40 consists of two parts independent 41 and 42, these independent parts overlapping a length Lc in a region substantially radially and axially inside the anchoring structure 20.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Tires In General (AREA)
• Ropes Or Cables (AREA)
• Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
• Fats And Perfumes (AREA)
• Preparation Of Compounds By Using Micro-Organisms (AREA)

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Publications (1)

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Cited By (4)

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Citations (3)

Family Cites Families (8)

• 2007
  • 2007-02-12 FR FR0701047A patent/FR2912346B1/fr not_active Expired - Fee Related
• 2008
  • 2008-01-30 AT AT08708410T patent/ATE477943T1/de not_active IP Right Cessation
  • 2008-01-30 EA EA200970757A patent/EA014624B1/ru not_active IP Right Cessation
  • 2008-01-30 BR BRPI0808454A patent/BRPI0808454A8/pt active Search and Examination
  • 2008-01-30 EP EP08708410A patent/EP2121355B1/fr not_active Not-in-force
  • 2008-01-30 JP JP2009549388A patent/JP5098093B2/ja not_active Expired - Fee Related
  • 2008-01-30 CN CN200880004668.6A patent/CN101626908B/zh not_active Expired - Fee Related
  • 2008-01-30 US US12/526,039 patent/US8061401B2/en not_active Expired - Fee Related
  • 2008-01-30 WO PCT/EP2008/051095 patent/WO2008107234A1/fr not_active Ceased
  • 2008-01-30 DE DE602008002229T patent/DE602008002229D1/de active Active

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