WO2001025031A1 - Pneumatiques a talons bloques - Google Patents

Pneumatiques a talons bloques Download PDF

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Publication number
WO2001025031A1
WO2001025031A1 PCT/US1999/022568 US9922568W WO0125031A1 WO 2001025031 A1 WO2001025031 A1 WO 2001025031A1 US 9922568 W US9922568 W US 9922568W WO 0125031 A1 WO0125031 A1 WO 0125031A1
Authority
WO
WIPO (PCT)
Prior art keywords
tire
bead
elastomeric
carcass
carcass ply
Prior art date
Application number
PCT/US1999/022568
Other languages
English (en)
Inventor
Jean-Marie Jules Joseph Koeune
Original Assignee
The Goodyear Tire & Rubber Company
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by The Goodyear Tire & Rubber Company filed Critical The Goodyear Tire & Rubber Company
Priority to PCT/US1999/022568 priority Critical patent/WO2001025031A1/fr
Priority to BR9917489-8A priority patent/BR9917489A/pt
Priority to US10/089,259 priority patent/US6845798B1/en
Priority to AU10974/00A priority patent/AU1097400A/en
Publication of WO2001025031A1 publication Critical patent/WO2001025031A1/fr

Links

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
    • B60C15/0009—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion
    • B60C15/0081—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion the carcass plies folded around or between more than one bead core
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/08—Building tyres
    • B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
    • B29D30/32—Fitting the bead-rings or bead-cores; Folding the textile layers around the rings or cores
    • 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
    • B60C2015/0614—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead characterised by features of the chafer or clinch portion, i.e. the part of the bead contacting the rim

Definitions

  • the present invention relates to a pneumatic tire, specifically to the carcass ply turnup structure in the bead region and more specifically to a locked bead type of construction.
  • BACKGROUND OF THE INVENTION In conventional tire construction, the carcass ply or plies are turned up around the bead cores and then extended radially outward in the sidewalls towards the tread in order to withstand the tensile stresses encountered during the use of the tire. As these stresses act in opposite direction on the carcass ply or plies proper and their upward turned portions, they cause shearing in the intermediate rubber. Furthermore, the flexing of the sidewalls during travel subjects the carcass reinforcement and the upward-turned portions thereof to alternate stresses, in opposite directions, which causing additional shear stresses in this same zone.
  • the locked-bead approach allows the sidewalls to have a reduced thickness in the vicinity of the bead region.
  • This reduced sidewall thickness results in a better distribution of flexibility that is particularly advantageous with tires having a small height to width ratio (for example of the order of 0.6).
  • locked-bead tire designs require a careful consideration of how best to anchor the carcass plies in the bead region without an excessive concentration of stress at the carcass ply ends.
  • U.S. Pat. No. 4,922,985 discloses a carcass ply having a main portion that extends between both bead cores of the tire and turnup portions that are anchored around each bead core by a clamping member.
  • the clamping member comprises a strip of side-by-side cords of a heat shrinkable material embedded in a suitable elastomeric substance having a permanent thermal shrinkage of at least 2 percent.
  • An aspect of the present invention is to improve bead durability by eliminating stresses at ply ending.
  • the present invention relates to a pneumatic tire, specifically to the carcass ply turnup structure in the bead region and more specifically to a locked bead type of construction.
  • the preferred embodiment of the present invention is a pneumatic tire having a tread, a belt structure, and a carcass structure comprising a pair of sidewalls, a pair of bead regions, and one or more plies of cord reinforced elastomeric material anchored in each bead region and extending radially outward through the sidewalls and laterally across a crown portion of the tire radially inward of tread.
  • the bead regions of the present invention each comprise an inextensible annular bead core in a side-by-side relationship with a coaxial elastomeric torus, the torus placed outwardly adjacent to each bead core relative to the equatorial plane of the tire.
  • the carcass plies within each bead region extend radially inward from the sidewalls and proceed inward of the bead core relative to the equatorial plane of the tire.
  • the carcass plies are then wrapping around and radially outward of the elastomeric torus with the locked edge of the carcass plies located back under and radially inward of the bead core.
  • the elastomeric torus can be made of pre-cured rubber or reinforced by fibers, including by way of example and not by way of limitation, materials such as glass Aramid, steel, or polyester.
  • the method includes the steps of; placing the pair of elastomeric toruses over the carcass material for their incorporation in the bead regions of the tire; folding the margins of the carcass material over the top of the elastomeric toruses; placing a bead core inwardly adjacent to the enfolded elastomeric torus relative to the center of the drum; and expanding the drum to hold the bead cores in place, inflating the carcass and completing the tire by conventional tire building processes.
  • the tire forming drum can be provided with a groove to hold the torus. Also the center of the drum may be expanded after the application of the bead core and before the addition of the chafer and other components to prevent bead deformation.
  • similar elements may be referred to with similar numbers in a single drawing.
  • a plurality of elements 199 may be referred to as 199a, 199b, 199c, etc.
  • the cross-sectional views presented herein may be in the form of "slices" , or
  • FIGURE 1 is the cross-sectional view of a prior art tire with a conventional locked-bead construction
  • FIGURE 2 is a cross-sectional view of an embodiment of the present invention incorporating and new generation of locked-bead construction
  • FIGURE 3 is a partial view of the bead region of a tire of the present invention.
  • FIGURE 4A is a partial view of the present invention on a tire forming drum during an initial step of the manufacturing process
  • FIGURE 4B is a partial view of the present invention on tire forming drum during an intermediate step of the manufacturing process
  • FIGURE 4C is a partial view of the present invention on a tire building drum during a final step of the manufacturing process.
  • “Apex” means an elastomeric filler located radially above the bead core and between the plies and the turnup plies.
  • “Aspect Ratio” means the ratio of the section height of a tire to its section width; also refers to the cross-sectional profile of the tire; a low-profile tire, for example, has a low aspect ratio.
  • Axial and “Axially” means the lines or directions that are parallel to the axis of rotation of the tire.
  • Bead or “Bead Core” generally means that part of the tire comprising an annular tensile member of radially inner beads that are associated with holding the tire to the rim; the beads being wrapped by ply cords and shaped, with or without other reinforcement elements such as flippers, chippers, apexes or fillers, toe guards and chafers.
  • Belt Structure or "Reinforcement Belts” or “Belt Package” means at least two annular layers or plies of parallel cords, woven or unwoven, underlying the tread, unanchored to the bead, and having both left and right cord angles in the range from 18 degrees to 30 degrees relative to the equatorial plane of the tire.
  • “Breakers” or “Tire Breakers” means the same as belt or belt structure or reinforcement belts.
  • Carcass means the tire structure apart from the belt structure, tread, undertread over the plies, but including the beads.
  • “Casing” means the carcass, belt structure, beads, sidewalls and all other components of the tire excepting the tread and undertread.
  • “Circumferential” most often means circular lines or directions extending along the perimeter of the surface of the annular tread perpendicular to the axial direction; it can also refer to the direction of the sets of adjacent circular curves whose radii define the axial curvature of the tread, as viewed in cross section.
  • “Cord” means one of the reinforcement strands, including fibers, with which the plies and belts are reinforced.
  • “Crown” or “Tire Crown” means the tread, tread shoulders and the immediately adjacent portions of the sidewalls.
  • Equatorial Plane means the plane perpendicular to the tire's axis of rotation and passing through the center of its tread; or the plane containing the circumferential centerline of the tread.
  • “Footprint” means the contact patch or area of contact of the tire tread with a flat surface.
  • Inner Liner means the layer or layers of elastomer or other material that form the inside surface of a tubeless tire and that contain the inflating fluid within the tire.
  • Insert means the crescent-shaped or wedge-shaped reinforcement typically used to reinforce the sidewalls of runflat-type tires.
  • “Lateral” means a direction parallel to the axial direction.
  • “Ply” means a cord-reinforced layer of rubber coated radially deployed or otherwise parallel cords.
  • Ring and “radially” mean directions radially toward or away from the axis of rotation of the tire.
  • Ring Ply Structure means the one or more carcass plies or which at least one ply has reinforcing cords oriented at an angle of between 65 degrees and 90 degrees with respect to the equatorial plane of the tire.
  • Ring Ply Tire means a belted or circumferentially-restricted pneumatic tire in which at least one ply has cords which extend from bead to bead are laid at cord angles between 65 degrees and 90 degrees with respect to the equatorial plane of the tire.
  • “Section Height” means the radial distance from the nominal rim diameter to the outer diameter of the tire at its equatorial plane.
  • “Section Width” means the maximum linear distance parallel to the axis of the tire and between the exterior of its sidewalls when and after it has been inflated at normal pressure for 24 hours, but unloaded, excluding elevations of the sidewalls due to labeling, decoration or protective bands.
  • Shader means the upper portion of sidewall just below the tread edge.
  • “Sidewall” means that portion of a tire between the tread and the bead.
  • Tangential and “Tangentially” refer to segments of circular curves that intersect at a point through which can be drawn a single line that is mutually tangential to both circular segments.
  • Thread Cap refers to the tread and the underlying material into which the tread pattern is molded.
  • Thread width means the arc length of the tread surface in the plane includes the axis of rotation of the tire.
  • FIGURE 1 there is shown a prior art locked bead tire 110.
  • the prior art tire 110 has an annular tread 112 disposed radially outward of annular belt structure 114.
  • a carcass structure 120 comprising one or more carcass plies 122 extending laterally between bead cores 124a, 124b.
  • the turnup ends 122a, 122b of the carcass ply are turned up around the bead cores 124a, 124b and anchored to the beads by clamping members 126a, 126b.
  • the clamping members 126a, 126b comprise strips of side -by-side cords of a heat shrinkable material embedded in a suitable elastomeric substance and having a permanent thermal shrinkage of at least 2 percent.
  • This strip of cords extends circumferentially and extends in contact with the carcass ply 122(or the innermost carcass if the tire is provided with multiple carcass plies) from a location radially and axially inward of the bead core 124a, 124b to a location radially outward of the bead core and adjacent to the main portion of the carcass ply 122.
  • the carcass ply 122 is turned up around the bead cores 124a, 124b without any significant gaps between the carcass ply and the bead cores.
  • turned up ends 122a, 122b of the carcass ply 122 extend radially outward from the bead core 124a, 124b a minimum distance to allow some pull-down of the carcass ply during the shaping and curing process. Otherwise the carcass ply 122 might not be anchored to the bead cores 124a, 124b by the clamping members 126a,126b.
  • the turned up ends 122a, 122b of the carcass ply 122 are placed adjacent to the main portion of the carcass ply 120 and there is no filler or apex disposed between the main portion and the turned up portion of the carcass ply.
  • the placement of the turned up ends 122a, 122b of the carcass ply 122 adjacent to the bead cores 124a, 124b and the main portion of the carcass ply 122 without fillers or apex is the distinguishing characteristic of a locked bead type of tire construction. Locked bead construction as exemplified by the prior art tire 110 illustrated by
  • FIGURE 1 provides the sidewalls 116a, 116b of the tire with increased flexibility in the proximity of the bead cores 124a, 124b and reduces destructive shear stresses between the turned up ends 122a, 122b of the carcass ply 122 and the central portion of the carcass ply 122 that are caused by bending. Because there are no fillers or apexes, the thickness of the sidewall 116a, 116b in the proximity of the bead cores 124a, 124b is minimized. With reduced thickness, the sidewalls 116a, 116b provide a reduced resistance to bending.
  • FIGURE 2 illustrates an improved locked bead tire 230 according to the present invention.
  • the tire 230 is provided with an annular tread 232 and a belt structure 234 located radially inward of the tread.
  • the tire 230 has a carcass structure 240 comprising two sidewalls, 236a,236b and two bead regions 238a,238b with at least one carcass ply 242 having turnup ends 242a,242b anchored in bead region 238a,238b, as discussed in more detail below.
  • the turnup ends extend radially outward through sidewall 236a,236b, proceeding laterally and radially inward of the belt structure 234, returning radially inward through sidewalls 236a, 236b and anchored in bead region 238a,238b.
  • the bead regions 238a,238b comprise an inextensible bead core 244a and 244b, respectively, and an elastomeric torus or ring 246a and 246b, respectively.
  • Each elastomeric torus 246a, 246b is located laterally outward from and adjacent to the bead cores 244a,244b, respectively, relative to the equatorial plane EP of the tire 230.
  • the elastomeric torus 246a, 246b is preferably constructed of a pre-cured or partially cured rubber so that the torus can be easily handled and will maintain its shape during the initial manufacturing stages.
  • the toruses 246a, 246b can be reinforced by fibers of materials including glass, aramid, steel and polyester.
  • Preferred section diameter of torus 246a, 246b is 5mm to 8 mm which is compatible with the carcass ply flexiblity. While the toruses are shown with a circular cross section, it is within the scope of the invention to provide a torus with other geometrical cross sections, such as but not limited to square, oblong, triangular and octaganol.
  • FIGURE 3 a detail the bead region 238b of the tire 230 mounted on a tire rim 358 is illustrated. Bead region 238a is a mirror image of bead region 238b and therefore not discussed.
  • ply 242 extends down sidewall 236b and includes a turnup end 242b that initially wraps around and under bead core 244b. Turnup end 242b then extends laterally outward under the bead core 244b relative to the equitorial plane of the tire 230, under the elastomeric torus 246b and is then turned up and around the elastomeric torus 246b.
  • the turnup end 242b is folded back under the bead core 244b so that the locked end section 250b of the carcass ply turnup end 242b is located radially inward of the bead core 244b and anchored between the bead core and the initial turn of the carcass ply end 242b where it extends laterally outward from the central portion of ply 242 and around and under the bead core 244b.
  • the locked end sections 250a,250b can wrap around the bead cores 244a,244b and extend upward adjacent against the central portion of the ply 242.
  • the preferred embodiment of the present invention provides all the benefits of conventional locked bead construction, as shown in FIGURE 1, including improved sidewall flexibility and the minimization of bending induced shear stresses where turned up portions of the carcass ply are placed adjacent to main portions of the carcass ply.
  • the carcass ply 242 radially inward of the bead cores 244a, 244b, respectively, so that they are constrained between the bead cores 244a, 244b and the turnup ends 242a, 242b and the main portion of the carcass ply 242.
  • the carcass ply 242 remains on tension when the tire is inflated or inflated and loaded.
  • the elastomeric torus 246a, 246b performs a stress relief function that prevents concentrations of stress in the carcass ply 242.
  • the carcass ply 242 is securely anchored in the bead regions 238a,238b of the tire 230 without requiring the extension of a turned up ends 242a, 242b of the carcass ply to extend radially outward beyond the bead cores 238a,238b. This is accomplished by first turning the ends 242a,242b of the carcass ply 242 up around the elastomeric torus 246a, 246b. respectively with anchored end sections 250a,250b disposed against the ends 242a,242b of the ply 242.
  • the bead cores 244a, 244b are then placed on the outer facing surface of anchored end sections 250a,250b and inwardly adjacent to the now enfolded elastomeric torus 246a,246b relative to the equatorial plane of the tire 230 thereby securing the anchored end sections 250a,250b of the ply 242 radially inward of the bead cores 244a, 244b
  • FIGURES 4A,4Band 4C several steps in the process of forming the bead regions 238a,238b using a substantially conventional tire building drum are illustrated. Only the formation of bead region 238b is described, since both regions are formed in the same manner.
  • FIGURE 4A illustrates the initial step in process of building the tire 230 according to the present invention wherein the carcass ply 242 is placed on the tire building drum 452 followed by the addition of the elastomeric torus 246b above a groove 454b formed in a section 452b.
  • the inside diameter of the elastomeric torus 246b should preferably be slightly smaller than the diameter of the drum 452 at the bottom of the groove 454b during the initial building step.
  • the elastomeric torus 246b may be held in place within groove 454b in section 452b of the drum by pressing the elastomeric torus into groove 454b by any conventional means. As illustrated by
  • FIGURE 4B the turnup end 242b of the carcass ply 242 is then folded back over the elastomeric torus 246b toward the center section 452c of the drum 452 and the bead core 244b is placed upon the locked or anchored end section 250b inwardly of and adjacent to the now enfolded torus 246b relative to the center portion 452c of building drim 452.
  • the center portion 452c of the drum 452 is expanded prior to the addition of the chafer 248b to prevent movement of the bead core 244b when the carcass 242 is inflated and the manufacture of the tire 230 is completed by conventional tire building processes well known to those familiar with the art.

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

Abstract

L'invention concerne un pneumatique à talons bloqués dans lequel les extrémités relevées (242a, 242b) des plis de la carcasse (242) sont relevées autour d'un tore élastomère (246a, 246b) à l'extérieur des coeurs de talon (244a, 244b) et en position adjacente à ceux-ci, de sorte que les extrémités bloquées (250a, 250b) des plis soient repliées en arrière et placées radialement à l'intérieur par rapport aux coeurs de talon, pour un ancrage entre les coeurs de talon et les extrémités relevées des plis de la carcasse.
PCT/US1999/022568 1999-09-30 1999-09-30 Pneumatiques a talons bloques WO2001025031A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
PCT/US1999/022568 WO2001025031A1 (fr) 1999-09-30 1999-09-30 Pneumatiques a talons bloques
BR9917489-8A BR9917489A (pt) 1999-09-30 1999-09-30 Pneumático com talões travados
US10/089,259 US6845798B1 (en) 1999-09-30 1999-09-30 Locked bead construction
AU10974/00A AU1097400A (en) 1999-09-30 1999-09-30 Pneumatic tyre having locked beads

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1999/022568 WO2001025031A1 (fr) 1999-09-30 1999-09-30 Pneumatiques a talons bloques

Publications (1)

Publication Number Publication Date
WO2001025031A1 true WO2001025031A1 (fr) 2001-04-12

Family

ID=22273704

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/022568 WO2001025031A1 (fr) 1999-09-30 1999-09-30 Pneumatiques a talons bloques

Country Status (2)

Country Link
AU (1) AU1097400A (fr)
WO (1) WO2001025031A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10327678A1 (de) * 2003-06-20 2005-01-05 Continental Aktiengesellschaft Fahrzeugluftreifen

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1327810A (fr) * 1962-04-09 1963-05-24 Fr Du Pneu Englebert Soc Talon perfectionné de pneumatique
GB1000113A (en) * 1961-07-13 1965-08-04 Dunlop Rubber Co Improvements in or relating to pneumatic tyres
US3301303A (en) * 1963-05-04 1967-01-31 Michelin & Cie Tire casing
FR2678544A1 (fr) * 1991-07-03 1993-01-08 Michelin & Cie Procede de fabrication d'un pneumatique a armature de carcasse radiale, et pneumatique obtenu.
WO1995023073A1 (fr) * 1994-02-28 1995-08-31 Compagnie Générale des Etablissements MICHELIN-MICHELIN & Cie Pneumatique avec des bourrelets de structure amelioree et ensemble d'un tel pneumatique avec une jante adaptee
FR2773518A1 (fr) * 1998-01-12 1999-07-16 Michelin & Cie Bourrelet de pneumatique avec elements de renfort circonferentiels
EP0953435A1 (fr) * 1998-04-27 1999-11-03 COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN-MICHELIN & CIE Procédé de fabrication de pneumatiques et tambour d'assemblage permettant la mise en oeuvre du procédé

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1000113A (en) * 1961-07-13 1965-08-04 Dunlop Rubber Co Improvements in or relating to pneumatic tyres
FR1327810A (fr) * 1962-04-09 1963-05-24 Fr Du Pneu Englebert Soc Talon perfectionné de pneumatique
US3301303A (en) * 1963-05-04 1967-01-31 Michelin & Cie Tire casing
FR2678544A1 (fr) * 1991-07-03 1993-01-08 Michelin & Cie Procede de fabrication d'un pneumatique a armature de carcasse radiale, et pneumatique obtenu.
WO1995023073A1 (fr) * 1994-02-28 1995-08-31 Compagnie Générale des Etablissements MICHELIN-MICHELIN & Cie Pneumatique avec des bourrelets de structure amelioree et ensemble d'un tel pneumatique avec une jante adaptee
FR2773518A1 (fr) * 1998-01-12 1999-07-16 Michelin & Cie Bourrelet de pneumatique avec elements de renfort circonferentiels
EP0953435A1 (fr) * 1998-04-27 1999-11-03 COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN-MICHELIN & CIE Procédé de fabrication de pneumatiques et tambour d'assemblage permettant la mise en oeuvre du procédé

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10327678A1 (de) * 2003-06-20 2005-01-05 Continental Aktiengesellschaft Fahrzeugluftreifen

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Publication number Publication date
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