WO2006071229A1 - Pneumatique a mobilite accrue comprenant un insert a deux zones - Google Patents

Pneumatique a mobilite accrue comprenant un insert a deux zones Download PDF

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Publication number
WO2006071229A1
WO2006071229A1 PCT/US2004/043957 US2004043957W WO2006071229A1 WO 2006071229 A1 WO2006071229 A1 WO 2006071229A1 US 2004043957 W US2004043957 W US 2004043957W WO 2006071229 A1 WO2006071229 A1 WO 2006071229A1
Authority
WO
WIPO (PCT)
Prior art keywords
tire
zone
volume
axially
bead
Prior art date
Application number
PCT/US2004/043957
Other languages
English (en)
Inventor
Walter Lee Willard
Original Assignee
Michelin Recherche Et Technique S.A.
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 Michelin Recherche Et Technique S.A. filed Critical Michelin Recherche Et Technique S.A.
Priority to PCT/US2004/043957 priority Critical patent/WO2006071229A1/fr
Publication of WO2006071229A1 publication Critical patent/WO2006071229A1/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
    • B60C15/0018—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
    • B60C17/00—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor
    • B60C17/0009—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor comprising sidewall rubber inserts, e.g. crescent shaped inserts
    • B60C17/0018—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor comprising sidewall rubber inserts, e.g. crescent shaped inserts two or more inserts in each sidewall portion

Definitions

  • the invention relates to a tire, more specifically to a pneumatic tire capable of continued mobility in a deflated condition.
  • wheels are available which are equipped with supports capable of supporting the inside of the tread of a tire in the event of sagging of the sidewalls following a drop in pressure.
  • This solution is advantageously combined with a tire comprising a bottom zone capable of minimising the risk of the tire sliding out of the rim.
  • This solution is advantageous since it makes it possible to keep substantially intact the characteristics of travel under normal conditions.
  • it has the drawback of requiring an additional component, the support, for each of the wheels of the vehicle.
  • the extended mobility requirements are such that it is in general difficult to provide tires with comfort and driving characteristics that are comparable to standard tires.
  • the sidewall inserts are provided with high modulus materials, which generally have reduced comfort characteristics.
  • the invention provides a tire comprising a carcass structure anchored in each side of the tire in a bead, each bead having a base which is intended to be mounted on the tire's design mounting rim, each bead being extended radially upward by a sidewall portion, a reinforced summit, the sidewall portions joining said summit, said bead further comprising an anchoring zone for anchoring said carcass structure in said bead, said tire being adapted for continued mobility in a substantially deflated condition and comprising runflat inserts provided in the axially inner portion of the sidewalls, at least one of said inserts comprising two zones, an axially outer zone, having a volume Vo, occupied by an outer portion elastomeric material, and an axially inner zone, having a volume Vi, occupied by an inner portion elastomeric material, said volume Vi of said axially inner zone being substantially larger than said volume Vo of said axially outer zone.
  • the elastomeric material of said axially inner zone has a lower Modulus of extension ME10 than the elastomeric material of said axially outer zone.
  • Said axially inner zone extends preferably at least partially along carcass structure.
  • the volume ratio between the volume Vo of said axially outer zone and the volume Vi of said axially inner zone is substantially smaller than 0.95.
  • the volume ratio can also be smaller than 0.80.
  • the volume ratio is between 0.6 to 0.8.
  • the elastomeric material of said inner zone has a Modulus of extension ME10 comprised between 2 to 5 Mpa, and most preferably comprised between 3 to 4 Mpa.
  • the elastomeric material of said outer zone has a Modulus of extension ME 10 comprised between 4 to 9 Mpa, and most preferably comprised between 5 to 6 Mpa.
  • the axially outer zone preferably extends radially outwardly and forms a profile having a small thickness in the radially inner portion and a generally larger thickness in a radially outer portion.
  • the axially outer zone preferably extends radially outwardly and forms a profile generally enlarging from said radially inner portion towards said radially outer portion.
  • the runflat insert may be in direct contact with the cords of said carcass structure.
  • the at least one insert is advantageously provided on the outer sidewall of the tire.
  • Figure 1 illustrates a first example of a runflat tire according to the invention, taken along a meridian plane through the axis of rotation;
  • Figure 2 illustrates a second example of a runflat tire according to the invention, taken along a meridian plane through the axis of rotation;
  • Figure 3 illustrates a third example of a runflat tire according to the invention, taken along a meridian plane through the axis of rotation, having two carcass structures.
  • Ring and radially mean directions radially toward or away the axis of rotation of the tire.
  • Angle defined with respect to an axial direction means an angle measured axially and radially outwardly from the innerside of the tire; such an angle is between 0 and 180 degrees.
  • the reinforcement armature or reinforcement of the tires is currently - and most frequently - constituted by stacking one or more plies conventionally referred to as "carcass plies", “crown plies”, etc.
  • This manner of designating the reinforcement armatures is derived from the manufacturing process, which consists of producing a series of semi-finished products in the form of plies, provided with cord reinforcing threads which are frequently longitudinal, which products are then assembled or stacked in order to build a tire blank.
  • the plies are produced flat, with large dimensions, and are subsequently cut according to the dimensions of a given p roduct. T he plies a re a lso a ssembled, i n a first p hase, substantially flat.
  • the blank thus produced is then shaped to adopt the toroidal profile typical of tires.
  • the semi-finished products referred to as "finishing" products are then applied to the blank, so as to obtain a product ready to be vulcanised.
  • Such a type of "conventional" process involves, in particular for the phase of manufacture of the blank of the tire, the use of an anchoring element (generally a bead wire), used for anchoring or holding the carcass reinforcement in the zone of the beads of the tire.
  • an anchoring element generally a bead wire
  • a portion of all the plies constituting the carcass reinforcement is turned up around a bead wire arranged in the tire bead. In this manner, the carcass reinforcement is anchored in the bead.
  • the conventional terms such as "plies”, “bead wires”, etc.
  • the term “carcass structure” is valid as a designation for the reinforcement cords of a carcass ply in the conventional process, and the corresponding cords, generally applied at the level of the beads, sidewalls and summit of a tire produced in accordance with a process without semi-finished products.
  • anchoring zone for its part, may equally well designate the
  • cord very generally designates both monofilaments and multifilaments or assemblies such as cables, plied yarns or alternatively any equivalent type of assembly, whatever the material and the treatment of these cords. This may, for example, involve surface treatments, coating or pre-sizing in order to promote adhesion to the rubber.
  • unitary cord designates a cord formed of a single element, without assembling.
  • multifilament designates an assembly of at least two unitary elements to form a cable, plied yarn etc.
  • Chargeristics of the cord is understood to mean, for example, its dimensions, its composition, its characteristics and mechanical properties (in particular the modulus), its chemical characteristics and properties, etc.
  • contact between a cord and a layer of bonding rubber is understood to mean the fact that at least part of the outer circumference of the cord is in intimate contact with the rubber composition constituting the bonding rubber.
  • the carcass ply or plies is/are turned up about a bead wire.
  • the bead wire then performs a carcass anchoring function.
  • it withstands the tension which develops in the carcass cords for example under the action of the inflation pressure.
  • “Sidewalls” refers to the portions of the tire, most frequently of low flexural strength, located between the crown and the beads. “Sidewall mix” refers to the rubber mixes located axially to the outside relative to the cords of the reinforcement structure of the carcass and to their bonding rubber. These mixes usually have a low elasticity modulus.
  • Bead refers to the portion of the tire adjacent radially internally to the sidewall.
  • Modulus of extension ME10 of a rubber composition is understood to mean an apparent secant modulus of extension obtained at a uniaxial deformation of extension of the order of 10% measured at 23°C in accordance with Standard ASTM D 412.
  • radially upwards or “radially upper” or “radially externally” means towards the largest radii.
  • a reinforcement or reinforcing structure or carcass structure will be said to be radial when its cords are arranged at 90°, but also, according to the terminology in use, at an angle close to 90°.
  • the tire of the invention comprises a bead 1 provided with a seat 12, specially adapted to fit on the tire mounting rim.
  • the bead extends substantially radially to the sidewall 13.
  • the summit 14 comprises reinforcement layers of known type.
  • the tire comprises a carcass structure 5, extending from bead to bead or leaving a gap between two half structures, for instance in the substantially median portion of the summit.
  • the radially inwardmost extent of the carcass structure 5 terminates in an anchoring zone 2 of the bead 1.
  • the carcass structure is not turned up around bead cores or other bead reinforcement. That is to say, each axial coordinate defining the profile of the carcass structure has a unique radial position for each radial position less than that of the tire equator.
  • the carcass structure is anchored in the bead portion by a bead reinforcement 3.
  • a preferred embodiment of such a reinforcement comprises a cord arrangement 4 provided with at least one substantially circumferentially oriented cord laterally bordering the carcass structure on at least one side.
  • "anchored" in the bead portion means that the cord arrangement resist the tension developed in the carcass structure during inflated or deflated use of the tire by the adherence of the carcass reinforcing structure laterally with the cord arrangement rather than being wound around a traditional bead core.
  • the mechanical properties of the anchoring zone 4 may be optimized in using an elastomeric bead filler having preferably a relatively high elasticity modulus.
  • the carcass ply is conventionnally turned up about a bead wire.
  • the bead wire then performs a carcass anchoring function.
  • the tire of the invention preferably comprises a runflat insert 9 p rovided i n the axially inner portion of each sidewall. At least one of said inserts comprising two zones or portions, an axially outer zone or portion 11 , having a volume Vo, and an axially inner zone or portion 10 having a volume Vi substantially larger than said volume of said axially outer zone.
  • the elastomeric material of said axially inner zone has a lower Modulus of extension ME10, than the elastomeric material of said axially outer zone.
  • the Modulus of portion 10 may be between 2 to 5 Mpa and most preferably 3 to 4 Mpa, whereas the Modulus of the portion 11 may be between 4 to 9 Mpa and most preferably 5 to 6 Mpa.
  • Vo of said axially outer zone and the volume Vi of said axially inner zone is substantially smaller than 0.95 and preferably smaller than 0.80.
  • the axially outer zone 11 extends radially outwardly and forms a profile having a small thickness in the radially inner portion and a generally larger thickness in a radially outer portion.
  • the axially outer zone extends radially outwardly and forms a profile generally enlarging from said radially inner portion towards said radially outer portion.
  • Figure 3 illustrates another variant of the tire of the invention, provided with two carcass structures 5.
  • the two carcass structures are axially separated along the sidewalls, and are substantially coplanar in the summit zone. In another variant, they are separated from one bead to the other, including the summit zone.
  • Such a dual arrangement provides increased rigidity and may contribute to extend the reduced pressure rolling possibilities.
  • this insert is provided on the outer sidewall of the tire.
  • the tire In order to position the reinforcement cords as precisely as possible, it is very advantageous to build the tire on a rigid support, for instance a rigid core imposing the shape of its inner cavity. All the components of the tire, which are disposed directly in their final place, are applied onto this core in the order required by the final architecture, without undergoing shaping at any moment of the building. In this case, the tire can be molded and vulcanized in the manner explained in US 4,895,692.

Abstract

L’invention concerne un pneumatique, comprenant une structure de carcasse (5) ancrée de chaque côté du pneumatique dans un talon (1), le talon comprenant en outre une zone d’ancrage (2) pour ancrer la structure de carcasse (5) dans le talon (1), le pneumatique étant conçu pour pouvoir continuer de rouler dans un état sensiblement dégonflé et comprenant des inserts de roulement à plat (9) montés dans la partie axialement intérieure de parois latérales (13), au moins un des inserts (9) comprenant deux zones, à savoir une zone axialement extérieure (11) possédant un volume Vo occupé par une matière élastomère de partie extérieure, et une zone axialement intérieure (10) possédant un volume Vi occupé par une matière élastomère de partie intérieure, le volume Vi de la zone axialement intérieure (10) étant sensiblement plus important que le volume Vo de la zone axialement extérieure (11).
PCT/US2004/043957 2004-12-29 2004-12-29 Pneumatique a mobilite accrue comprenant un insert a deux zones WO2006071229A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US2004/043957 WO2006071229A1 (fr) 2004-12-29 2004-12-29 Pneumatique a mobilite accrue comprenant un insert a deux zones

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2004/043957 WO2006071229A1 (fr) 2004-12-29 2004-12-29 Pneumatique a mobilite accrue comprenant un insert a deux zones

Publications (1)

Publication Number Publication Date
WO2006071229A1 true WO2006071229A1 (fr) 2006-07-06

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Family Applications (1)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7703493B2 (en) 2003-12-30 2010-04-27 Michelin Recherche Et Technique S.A. Tyre having asymmetrical self-supporting sidewalls
EP2196334A2 (fr) 2008-12-12 2010-06-16 The Goodyear Tire & Rubber Company Pneu autoportant avec pli optimisé
US8476808B2 (en) 2008-08-29 2013-07-02 Michelin Recherche Et Technique 1-d tire apparatus
US8742265B2 (en) 2008-08-29 2014-06-03 Compagnie Generale Des Etablissements Michelin 1-D tire patch apparatus and methodology
US10894448B2 (en) 2015-02-11 2021-01-19 Bridgestone Americas Tire Operations, Llc Runflat tire with sidewall-reinforcing inserts

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4287924A (en) * 1978-05-10 1981-09-08 Pneumatiques, Caoutchouc Manufacture Et Plastiques Safety tire with sidewall support members having two parts with different flexibilities
US5413160A (en) * 1991-11-15 1995-05-09 Pirelli Coordinamento Pneumatici S.P.A. Self-supporting tire for motor-vehicle wheels incorporating elastic support inserts in the sidewalls
US6269857B1 (en) * 1998-08-04 2001-08-07 Toyo Tire & Rubber Co., Ltd. Run-flat tire with side-reinforcing rubber pad and fibrous layer
WO2002030691A1 (fr) * 2000-10-10 2002-04-18 Societe De Technologie Michelin Pneu comportant un plus grand nombre de nappes de carcasse dans le flanc que dans le talon
WO2003029033A1 (fr) * 2001-09-28 2003-04-10 Pirelli Pneumatici S.P.A. Pneu a flancs renforces pour roues de vehicules et son procede de fabrication
US6672351B1 (en) * 1999-08-31 2004-01-06 Dunlop Gmbh Vehicle tire with continously reducing vertical spacing of tread surface with respect to breaker

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4287924A (en) * 1978-05-10 1981-09-08 Pneumatiques, Caoutchouc Manufacture Et Plastiques Safety tire with sidewall support members having two parts with different flexibilities
US5413160A (en) * 1991-11-15 1995-05-09 Pirelli Coordinamento Pneumatici S.P.A. Self-supporting tire for motor-vehicle wheels incorporating elastic support inserts in the sidewalls
US6269857B1 (en) * 1998-08-04 2001-08-07 Toyo Tire & Rubber Co., Ltd. Run-flat tire with side-reinforcing rubber pad and fibrous layer
US6672351B1 (en) * 1999-08-31 2004-01-06 Dunlop Gmbh Vehicle tire with continously reducing vertical spacing of tread surface with respect to breaker
WO2002030691A1 (fr) * 2000-10-10 2002-04-18 Societe De Technologie Michelin Pneu comportant un plus grand nombre de nappes de carcasse dans le flanc que dans le talon
WO2003029033A1 (fr) * 2001-09-28 2003-04-10 Pirelli Pneumatici S.P.A. Pneu a flancs renforces pour roues de vehicules et son procede de fabrication

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7703493B2 (en) 2003-12-30 2010-04-27 Michelin Recherche Et Technique S.A. Tyre having asymmetrical self-supporting sidewalls
US8476808B2 (en) 2008-08-29 2013-07-02 Michelin Recherche Et Technique 1-d tire apparatus
US8742265B2 (en) 2008-08-29 2014-06-03 Compagnie Generale Des Etablissements Michelin 1-D tire patch apparatus and methodology
US9333811B2 (en) 2008-08-29 2016-05-10 Compagnie Generale Des Etablissements Michelin 1-D tire patch apparatus and methodology
EP2196334A2 (fr) 2008-12-12 2010-06-16 The Goodyear Tire & Rubber Company Pneu autoportant avec pli optimisé
EP2196334A3 (fr) * 2008-12-12 2013-08-28 The Goodyear Tire & Rubber Company Pneu autoportant avec pli optimisé
US10894448B2 (en) 2015-02-11 2021-01-19 Bridgestone Americas Tire Operations, Llc Runflat tire with sidewall-reinforcing inserts

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