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
• • 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
  • B60C15/06—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead
  • B60C15/0603—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead characterised by features of the bead filler or apex
  • B60C15/0607—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead characterised by features of the bead filler or apex comprising several parts, e.g. made of different rubbers
• • 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
  • B60C2015/0617—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead comprising a cushion rubber other than the chafer or clinch rubber
  • B60C2015/0621—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead comprising a cushion rubber other than the chafer or clinch rubber adjacent to the carcass turnup portion
• • 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
• • 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
  • Y10T152/10828—Chafer or sealing strips
• • 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
• • 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
  • Y10T152/10846—Bead characterized by the chemical composition and or physical properties of elastomers or the like
• • 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
  • Y10T152/10855—Characterized by the carcass, carcass material, or physical arrangement of the carcass materials
  • Y10T152/10864—Sidewall stiffening or reinforcing means other than main carcass plies or foldups thereof about beads

Definitions

• the present invention relates to a tire with a radial carcass reinforcement, and more particularly to a "Heavy goods vehicle” tire, intended to equip vehicles such as trucks, road tractors, buses, trailers and others, and in which a new reinforcement structure beads is adapted to improve the endurance of said beads.
• a tire of the type under consideration comprises a carcass reinforcement formed of at least one ply of metal cables, anchored in each bead to at least one bead, by forming a reversal.
• the carcass reinforcement is radially surmounted by a crown reinforcement, composed of at least two plies of metal cables, crossed from one ply to the next, forming angles of between 10 ° and 45 ° with the circumferential direction.
• Carcass reinforcement reversals are generally reinforced by at least one ply of metal cables oriented at a small angle relative to the circumferential direction.
• the latter may be situated along the reversal of the carcass reinforcement with a radially upper end situated above or below the radially upper end of the reversal d carcass reinforcement.
• the radially lower end of such a ply it is generally situated either on a straight line parallel to the axis of rotation and passing approximately through the center of gravity of the meridian section of the anchoring rod of the reinforcement.
• carcass in the case of a tire having beads intended to be mounted on rim seats inclined at 15 ° ⁇ 2 °, or on a straight line parallel to the axis of rotation passing through a point - 2 - located between the center of gravity of the meridian section of the anchor bead and the point of maximum axial width of the carcass reinforcement, in the case of a tire having beads intended to be mounted on rim seats inclined at 0 ° or 5 ° ⁇ 1 °.
• the reinforcement ply of the bead is then wound around the rod, so as to have an axially outer strand and an axially inner strand, the radially upper end of the axially inner strand generally being located below the radially upper end of the axially outer strand.
• the known solution aims to avoid derialization of the cables of the upturn of the carcass reinforcement, as well as to minimize the radial and circumferential deformations undergone by the end of said upturn, and by the outer rubber layer covering the bead and ensuring the connection with the rim.
• the metal reinforcing ply has been replaced by several plies, textile for example, located axially either on the same side of the reversal, or on either side of said reversal, or even partially along the reversal and partly along the carcass reinforcement.
• Another variant consists in putting two reinforcing plies along the upturn, on either side of said upturn, and a third ply along the carcass reinforcement axially on the outside.
• the endurance of the beads can also be improved by placing two reinforcing plies along the carcass reinforcement, while the inversion of said reinforcement is not reinforced.
• said improvement can be obtained by the presence in the beads of at least one reinforcing ply formed of circumferential metallic elements, wound around the rod, outside the coiled part of the carcass reinforcement, so that the radially upper ends respectively of the axially outer strand and radially upper end of the axially inner strand are radially situated above a straight line parallel to the axis of rotation and passing through the point of the rod furthest from said axis of rotation.
• the carcass reinforcement formed of radial wires or cables, is thus, at its contact surface with the rod, formed, as known, of substantially circumferential elements which are generally metallic in the form of wires, cables, ribbons or rolled up strips, inserted between said elements with a substantially circumferential orientation and the additional ply of metallic elements, which are also circumferential.
• This structure thus allows the recovery of the tension forces undergone by the carcass reinforcement, and thus minimizes all the deformations at the ends of the carcass reinforcement upturning, whatever the driving conditions.
• FR 2 730 190 describes an advantageous variant for reinforcing the bead, consisting in that the end of the axially inner strand of the ply of circumferential elements is covered with a reinforcing ply (9), made up of metal cables radial. - 4 -
• said tire comprising at least one radial carcass reinforcement, formed of at least one ply of inextensible reinforcing elements and anchored in each bead B to a rod to form a reversal the end of which is located at a radial distance H ⁇ c from the bead base, each bead being reinforced by at least two additional reinforcing reinforcements, at least a first reinforcement formed radial reinforcing elements and at least a second reinforcement formed of elements making with the circumferential direction an angle ⁇ such as 0 ° ⁇ ⁇ ⁇ 45 °, characterized in that, seen in meridian section, the first reinforcing reinforcement formed of radial elements, is wrapped around the anchor rod of the carcass reinforcement outside said carcass reinforcement, to form two strands of spell e that the radially upper end of the axially outer strand is radially located at a distance H E from the base of
• Reinforcement elements will be considered to be radial, if the angle which they make with the circumferential direction of the tire is in the range 80 ° -100 °.
• reinforcement wound around the rod is meant a reinforcement forming two axially inner and outer strands whose respective ends are located - 5 - radially above a straight line parallel to the axis of rotation passing through the center of gravity of the cross section of the anchor rod.
• the term radially upper end of the strand of a bead reinforcement reinforcement which may consist of one or more plies, means the end of the reinforcement ply the further from the axis of rotation, the reinforcing plies may have upper ends included in a radial distance interval at most equal to 20 mm.
• the radially lower end of a bead reinforcement reinforcement will be the lower end of the ply the least distant from the axis of rotation.
• the first reinforcement of radial reinforcing elements is advantageously formed of a single ply of inextensible metallic cables, the end of the axially inner strand of which is situated between the straight line parallel to the axis of rotation and passing through the center of gravity of the cross section of the rod and the straight line parallel to said axis of rotation and passing through the point of maximum axial width of the carcass reinforcement.
• the radially upper end of the axially outer strand is then preferably located at a radial distance from the base of the bead between 65% and 95% of the distance H RNC separating the end of the carcass reinforcement upturn from said base.
• the second additional bead reinforcement reinforcement may be formed of at least one ply of circumferential metallic reinforcement elements; it is then advantageous, in order to facilitate manufacture and reduce the cost thereof, to choose as reinforcing elements of said ply sections or sets of sections of metal cables, of circumferential length less than the circumferential length of the mean axis of the rod. - 6 -
• the second reinforcement can also be formed of two plies of reinforcing elements parallel to each other in each ply, crossed from one ply to the next, making an angle of 45 ° with the circumferential direction, measured at the radially lower edges of said two plies and the reinforcing elements advantageously being textile threads or cables, said second reinforcement structure being particularly advantageous in the case of a first bead reinforcement reinforcement composed of textile reinforcement elements, the end of the axially outer strand being able to be located at a radial distance from the bead base greater than the distance H RNC , while remaining less than the radial distance separating from said base the end of the axially inner strand.
• It can also be formed, as known per se, from a single ply of metal cables parallel to each other in the ply and forming a slight angle with the circumferential direction between 5 ° and 30 °.
• the second frame whether textile or metallic, can be arranged axially outside the upturn of the carcass frame, the radially upper end of said frame then being closer to the axis of rotation than the is the end of the axially outer strand of the first bead reinforcement frame. It can also be arranged axially inside the carcass reinforcement upturn, between said upturn and the axially outer wall of the triangular rubber profile located radially outside the anchor rod. Said second frame is advantageously disposed either axially inside or axially outside the unreturned part of the carcass frame, having a radially upper end closer to the axis of rotation than is the case. 'upper end of the axially inner strand of the armature of radial elements. - 7 -
• FIG. 1 schematically represents a first variant of bead according to the invention
• FIG. 2 schematically represents a second variant of bead according to the invention, the rods being braided rods and the bead being thinned,
• FIG. 3 schematically shows a third variant of the invention.
• the bead B shown in FIG. 1 is that of a 10.00-20 X tire, intended to be mounted on a rim comprising seats already inclined at 5 °. Said bead is reinforced by a rod (2). Around said rod (2) is anchored a carcass reinforcement (1) composed of a single ply of metal cables.
• the anchoring is done by a reversal (10) around the layer (20) of rubber mixture which covers the rod (2), the radial distance H RNC separating the radially upper end of said reversal (10), from the base of the bead, said base being by convention represented by the straight line parallel to the axis of rotation passing through the point of the bead wire (2) closest to said axis of rotation, being equal, in the example studied of the tire of dimension 10.00- 20, at 0.25 times the height H of the tire on the rim, the latter being the radial distance separating the point of the tire radially furthest from the axis of rotation of the straight line for measuring the nominal diameter of the mounting rim, and equal to 270 mm.
• a first rod stuffing (3) in rubber mixture of generally high Shore hardness is disposed between the carcass reinforcement (1) and - 8 - its reversal (10), radially above the rod (2), radially above the rod (2), a first rod stuffing (3) in rubber mixture of generally high Shore hardness, said first stuffing (3) being extended radially by a second stuffing (4) in a rubber mixture with a lower Shore hardness than the previous one and the radially upper end of said stuffing (4) being substantially situated at the level of the maximum axial width of the tire.
• a first bead reinforcement frame composed, in the example described, of a single ply (6), so as to form two strands, an axially inner strand (61) and an axially outer strand (60).
• the radially upper ends respectively of the two strands (61) and (60) are located relative to the base of the bead at heights H L1 and H LE respectively equal to 80 mm and 58 mm, the distance H LE being equal to 85% of the distance H RN .
• the ply (6) of said first frame is formed of metal wires or cables oriented at 90 ° relative to the circumferential direction.
• the two ends respectively of the upturn of the carcass reinforcement and of the axially outer strand of the reinforcement ply (6) are axially on the outside covered by a third packing (5), called filling and bearing on the one hand on the second rod stuffing (4) and on the ply parts (60) and (10).
• a second bead reinforcement reinforcement (7) composed, in the example described, of two plies (71) and (72) of textile cables of aliphatic polyamide, mutually parallel in each ply and crossed from one ply (71) to the next (72) by forming with the circumferential direction an angle of 45 °, measured on the vulcanized tire on the radially lower edges of the plies (71) and (72) and apart from manufacturing errors, that is to say angles included in the interval 45 ° ⁇ 1.5 °.
• the radially end - 9 - upper armature (7) which is by convention the radially upper end of the ply (72), the ply whose end is the furthest from the axis of rotation, is located at a radial distance from the base of the bead H RS equal to 55 mm, ie less than the distance H LI from the radially upper end of the axially inner strand of the bead reinforcement ply (6) of at least 33% of H LI .
• the upper end of the second ply (71) of the frame (7) is radially below the end of the ply (72), by 6 mm.
• the ply (6) of said first bead reinforcement frame can be formed of cables made of textile material, for example of aliphatic polyamide, oriented at 90 ° relative to the circumferential direction.
• Said ply (6) also has two strands, an axially inner strand (61) and an axially outer strand (60). The radially upper end of the strand (60) is then located relative to the base of the bead at a height H LE equal to 75 mm.
• the major part of the bead B is, as known per se, surrounded by a rubbery protective mixture (8), which is axially on the inside extended radially on the outside by the usual layers of rubbery and internal reinforcements (9) , while it is axially outside extended radially outside by the sidewall layer (7).
• the bead structure shown in FIG. 2 differs from that described above in that the second bead reinforcement frame is formed by a ply (7) of metallic elements instead of the two textile plies of the example. previous. Said elements are mutually parallel in the sheet (7) and - 10 - may be circumferential, that is to say forming with the circumferential direction an angle ⁇ equal to 0 ° apart from manufacturing errors, that is to say included in the interval (- 1.5 ° ; + 1.5 °).
• the elements can then be inextensible metal cables, but the manufacture of the tire will however be advantageously facilitated by the use, as reinforcement elements, of extensible cables.
• sections or of sets or groups of sections of cables of circumferential length comprised between 0.2 and 0.4 times the circumferential length of the reinforcing reinforcement, which allows the laying of the bead reinforcement reinforcement on the drum for making the raw carcass reinforcement blank and the toroidal shaping of said blank without major difficulties, and said average length being measured when laid on said drum confection.
• the circumferential gaps or cuts between cut elements will preferably be offset with respect to each other.
• the elements of the ply of the second reinforcing reinforcement (7) can also form with the circumferential direction a small angle which can be, for example, equal to 22 °; the reinforcing elements then being inextensible cables.
• Figure 3 shows a variant according to the invention with the advantage of being more economical.
• the first bead reinforcement frame (6) composed of a single ply (6) of inextensible and radial metallic cables has, compared to the ply (6) shown in FIG. 1 and described in the accompanying description, an axially inner strand (61) whose end is closer to the axis of rotation of the tire, since the distance H LE is only equal to 85%. of H RNC .
• the second bead reinforcement frame (7) is formed by a ply (7) of inextensible metallic steel cables parallel to each other in the ply and making an angle of 22 ° with the circumferential direction, said ply ( 7) being axially outside the axially outer strand (60) of the first reinforcing frame (6) and having on the one hand a radially upper end located radially below the end of said axially outer strand (60) of the- - 11 - below the end of said strand (60), and on the other hand a radially lower end practically located at the level of the bead base.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Tires In General (AREA)
• Ropes Or Cables (AREA)

Priority Applications (6)

Applications Claiming Priority (2)

Related Child Applications (1)

Publications (1)

Family

ID=9524398

Family Applications (1)

Country Status (11)

Cited By (2)

Families Citing this family (25)

Citations (7)

Family Cites Families (17)

• 1998
  • 1998-03-20 FR FR9803570A patent/FR2776238B1/fr not_active Expired - Fee Related
• 1999
  • 1999-03-08 JP JP2000537728A patent/JP4491134B2/ja not_active Expired - Fee Related
  • 1999-03-08 CN CNB001340336A patent/CN1159170C/zh not_active Expired - Lifetime
  • 1999-03-08 KR KR1020007010355A patent/KR100626564B1/ko not_active Expired - Fee Related
  • 1999-03-08 DE DE69905021T patent/DE69905021T2/de not_active Expired - Lifetime
  • 1999-03-08 EP EP99910333A patent/EP1064159B1/fr not_active Expired - Lifetime
  • 1999-03-08 CN CNB99805352XA patent/CN1204011C/zh not_active Expired - Lifetime
  • 1999-03-08 BR BR9908941A patent/BR9908941A/pt not_active IP Right Cessation
  • 1999-03-08 WO PCT/EP1999/001470 patent/WO1999048709A1/fr not_active Ceased
  • 1999-03-08 RU RU2000126497A patent/RU2225297C2/ru not_active IP Right Cessation
  • 1999-03-08 ES ES99910333T patent/ES2190200T3/es not_active Expired - Lifetime
• 2000
  • 2000-09-20 US US09/665,468 patent/US6622765B1/en not_active Expired - Fee Related
• 2002
  • 2002-07-03 US US10/189,034 patent/US6834699B2/en not_active Expired - Fee Related

Patent Citations (7)

Non-Patent Citations (1)

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