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
• • 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
  • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
  • Y10T156/17—Surface bonding means and/or assemblymeans with work feeding or handling means
  • Y10T156/1702—For plural parts or plural areas of single part

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.
• the bead reinforcement ply is then wrapped 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 end of the axially outer strand.
• 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 wound part of the carcass reinforcement, so that the radially upper ends of the axially outer strand and radially upper end of the axially inner strand respectively are radially located 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.
• the aim of which is to avoid deradialization of the cables for the reversal of the carcass reinforcement, as well as to minimize the radial and circumferential deformations respectively undergone by the end of said reversal and the radially upper end of the reinforcement ply, improved the endurance of the bead reinforcements, the performance of the tires being mounted on rims with seats at 0 ° or 5 ° ⁇ 1 ° is on the other hand reduced by the appearance and propagation of cracks in the layer of outer rubber covering the bead and ensuring the connection with the rim.
• the invention proposes to remedy the above drawbacks.
• said tire in accordance with the invention, 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 situated at a radial distance H RNC from the bead base, each bead B being reinforced by at least two additional reinforcements, at least a first reinforcement formed of at least one ply of radial reinforcing elements and at least a second reinforcement formed of at least one ply of inextensible elements forming with the circumferential direction an angle ⁇ such as 0 ° ⁇ ⁇ 45 °, characterized in that, seen in meridian section, the first reinforcing reinforcement is formed of radial and textile reinforcing elements, not wound around the anchoring rod of the carcass reinforcement and located
• Reinforcement elements will be considered to be radial, if the angle which they make with the circumferential direction of the tire is between 80 ° - 100 °.
• the radially upper end of a bead reinforcement reinforcement which may consist of one or more plies, is understood to mean the end of the most distant reinforcement ply of the axis of rotation, the reinforcing plies possibly having 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 textile cables, of aliphatic polyamide, composed of two twisted yarns, at least 250/250 rpm. It is preferably separated from the second frame by a rubber mix profile with a thickness at least equal to 2 mm.
• the second additional bead reinforcement reinforcement may be formed of at least one ply of circumferential metallic reinforcement elements; it is then advantageous, to facilitate the manufacture and in reduce the cost, 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. 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 °. In all cases, it is preferably separated from the carcass reinforcement upturn by a rubber mix profile with a thickness at most equal to 3 mm.
• the bead B shown in FIG. 1 is that of a 10.00.R.20 X tire, intended to be mounted on a rim comprising rim seats 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 conventionally represented by the straight line D 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 studied example of the tire of dimension 10.00 .R.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 rim mounting, and equal to 270 mm.
• a first rod stuffing (3) in rubber mix of generally high Shore A hardness is disposed between the carcass reinforcement (1) and its upturn (10), radially above the rod (2), disposed a first rod stuffing (3) in rubber mix of generally high Shore A hardness, said first stuffing (3) being extended radially by a second stuffing (4) in rubber mix of shore A hardness lower than the previous one and the radially upper end said padding (4) being substantially situated at the level of the maximum axial width of the tire.
• a second bead reinforcement frame is arranged, composed, in the example described, of a single ply (6), not turned around the rod ( 2).
• the radially upper end of said ply (6) is located relative to the base of the bead at a height H R equal to 50 mm, the distance H R being equal to 66% of the distance H RNC , the radially inner end being practically located on the line parallel to the axis of rotation defining the base of the bead.
• the ply (6) of said second frame is formed of metal cables oriented at 22 ° relative to the circumferential direction.
• the radially upper half of the ply (6) is axially separated from the upturn (10) of the carcass reinforcement (1) by a profile (5) of rubber mixture having a Shore A hardness substantially equal to the hardness of the same name of the mixture constituting the stuffing (4), and whose thickness eo, measured perpendicular to the turnaround (10) and at the level of the radially upper end of the ply (6) is equal to 3 mm.
• the two radially outer ends respectively of the upturn (10) of the carcass reinforcement (1) and of the reinforcement ply (6) of the bead are axially on the outside covered by a fourth profile or packing (7), said to be filling and taking support on the second rod stuffing (4), on the profile (5) and on a part of the upturn (10), and whose thickness e measured at the radially outer end of the second reinforcement of bead reinforcement, is equal to 2 mm.
• Axially outside the filling padding (7) and along said padding is disposed the first bead reinforcing frame, composed of a single ply (8) of cables 94/2 (tex) in twisted aliphatic polyamide 485 / 485 rpm.
• each ply or cable is constituted by two yarns (multifilament fibers), each having a titer of 94 tex before twisting, which are initially twisted individually at 485 rpm in a given direction , then twisted together at 485 m in the opposite direction.
• Said cables of the ply (8) are radial and precisely in the example described make an angle equal on average to 89 °.
• the radially outer end of the ply (8) is located at a radial distance H LE from the base of the bead equal to 80 mm, i.e. 106% of the distance H RNC separating the end of the upturn of carcass ply (1) of said base.
• the first reinforcing ply (8) isolates the protective rubber mixture (9) from the remainder of the bead axially on the outside, which, as known per se, surrounds most of the bead, said mixture (9) being axially at the center. interior extended radially outside by the usual layers of rubber and interior reinforcements (12), while it is axially outside extended radially outside by the side layer (11).

Landscapes

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

Priority Applications (7)

Applications Claiming Priority (2)

Related Child Applications (1)

Publications (1)

Family

ID=9527103

Family Applications (1)

Country Status (13)

Cited By (1)

Families Citing this family (46)

Citations (5)

Family Cites Families (5)

• 1998
  • 1998-06-05 FR FR9807146A patent/FR2779387B1/fr not_active Expired - Fee Related
• 1999
  • 1999-05-25 RU RU2001101240A patent/RU2223872C2/ru not_active IP Right Cessation
  • 1999-05-25 ES ES99926412T patent/ES2190218T3/es not_active Expired - Lifetime
  • 1999-05-25 WO PCT/EP1999/003606 patent/WO1999064259A1/fr not_active Ceased
  • 1999-05-25 HU HU0103130A patent/HU223151B1/hu not_active IP Right Cessation
  • 1999-05-25 JP JP2000553297A patent/JP4357746B2/ja not_active Expired - Fee Related
  • 1999-05-25 DE DE69905037T patent/DE69905037T2/de not_active Expired - Lifetime
  • 1999-05-25 BR BR9910922A patent/BR9910922A/pt not_active IP Right Cessation
  • 1999-05-25 CA CA 2334098 patent/CA2334098A1/fr not_active Abandoned
  • 1999-05-25 EP EP99926412A patent/EP1084047B1/fr not_active Expired - Lifetime
  • 1999-05-25 KR KR1020007013312A patent/KR100697970B1/ko not_active Expired - Fee Related
  • 1999-05-25 CN CNB998070416A patent/CN1159169C/zh not_active Expired - Lifetime
• 2000
  • 2000-12-05 US US09/730,265 patent/US6491078B2/en not_active Expired - Lifetime

Patent Citations (5)

Non-Patent Citations (2)

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