WO2008073098A1 - Pneu à flancs renforcés amélioré - Google Patents

Pneu à flancs renforcés amélioré Download PDF

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Publication number
WO2008073098A1
WO2008073098A1 PCT/US2006/047851 US2006047851W WO2008073098A1 WO 2008073098 A1 WO2008073098 A1 WO 2008073098A1 US 2006047851 W US2006047851 W US 2006047851W WO 2008073098 A1 WO2008073098 A1 WO 2008073098A1
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WO
WIPO (PCT)
Prior art keywords
flat tire
bead
run
membrane
ply
Prior art date
Application number
PCT/US2006/047851
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English (en)
Inventor
Ronald Hobart Thompson
Original Assignee
Michelin Recherche Et Technique S.A.
Societe De Technologie Michelin
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., Societe De Technologie Michelin filed Critical Michelin Recherche Et Technique S.A.
Priority to PCT/US2006/047851 priority Critical patent/WO2008073098A1/fr
Publication of WO2008073098A1 publication Critical patent/WO2008073098A1/fr

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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
    • 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

Definitions

  • the present invention relates to radial pneumatic tires used for vehicles and more particularly to the unique design of the sidewall and crown portions of a run-flat tire so as to reduce the overall thicknesses of the materials required in these parts of the tire.
  • the unique constructions described herein can provide for a weight reduction of run-flat tires so as to allow, for example, better economy during inflated operation while also permitting a reasonable distance of extended mobility after a loss of inflation pressure.
  • the load is mainly supported by internal inflation pressure.
  • support of the load can be shifted to the sides of the tire if structure of sufficient rigidity is present in the tire sidewall.
  • proposed run-flat constructions have included relatively thick, crescent-shaped rubber portions that are incorporated into the sidewall to provide additional rigidity and thus support for run-flat operation.
  • An example of such a construction is presented in Japanese Patent Application Publication No. 52-41521.
  • Such reinforcement of the sidewall portions of a run-flat tire can increase the load bearing ability of the sidewall while reducing or preventing undesirable buckling of the sidewall.
  • Such constructions typically require a significant increase in sidewall thickness.
  • Such increase in thickness is generally less desirable for several reasons.
  • the increased thickness requires that more materials, such as rubber, must be used for a given tire, which can increase the manufacturing cost.
  • the increased thickness of materials adds weight to the tire that can decrease fuel economy.
  • increasing the thickness of the sidewall to bear more vehicle load can lead to buckling of the crown portion.
  • Buckling of the crown portion is a condition wherein a bending moment is created such that the tread of the tire is lifted away from the travel surface and a portion of the sidewall begins to make undesirable contact with the travel surface.
  • Constructions have also been presented for addressing the buckling problem.
  • U.S. Patent No. 5,871,601 describes a rubber reinforcement for the sidewall that has a crescent-shaped cross-section.
  • An auxiliary belt, with cords optimally in a range of 45 to 75 degrees, is provided at the side of the crown portion of the tire to suppress buckling.
  • U.S. Patent No. 6,561,245 indicates a rubber reinforcement for the sidewall that has a crescent-shaped cross-section.
  • a steel cord reinforced layer is deployed radially outward of the belt structure and a cord-reinforced fabric layer is placed between the innerliner and the radially innermost ply.
  • a radial run-flat tire having an equator and defining axial and radial directions.
  • the run-flat tire comprises a crown portion having a tread and a shear layer disposed radially inward of the tread.
  • the shear layer has a dynamic shear modulus.
  • a first membrane is adhered to a radially inward extent of the shear layer and a second membrane is adhered to a radially outward extent of the shear layer.
  • the ratio of the circumferential compressive modulus of either one of the membranes to the dynamic shear modulus of the shear layer is at least about 100 to 1.
  • the tire includes a pair of axially spaced-apart, annular bead portions.
  • Each bead portion has a bead core and a bead apex, wherein the radially-outermost extent of the bead apex is positioned at a predetermined distance below the equator.
  • a pair of sidewall portions are provided with each sidewall portion extending radially between a respective axial edge of the crown portion and a respective bead portion.
  • Each sidewall portion has a reinforcing member extending radially outward from a position contiguous with a respective bead apex to a position radially inward of the crown portion.
  • Each reinforcing member is of a uniform thickness over that portion extending between a respective bead apex to a position adjacent an end of the first membrane.
  • the first and second membranes may be constructed a follows.
  • the first membrane may be constructed from a first ply and a second ply.
  • the first ply has first ply cords that are oriented at a first angle of about 20 degrees or less from the circumferential plane of the tire.
  • the second ply has second ply cords that are oriented at a second angle of about 20 degrees or less from the circumferential plane and in a manner that is opposite to the first angle of the first ply cords such that the first ply cords and the second ply cord cross.
  • the second membrane may be constructed from a third ply having third ply cords that are oriented substantially parallel to the circumferential plane.
  • the third ply cords may have a compressive modulus of about 12,000 MPa., a tensile modulus of about 40,000 MPa, and/or an infinite endurance limit at a compression strain of about 1 percent or less.
  • the third ply cords may have an equivalent homogenous thickness of about 0.30 mm 2 per mm width of the third ply.
  • the dynamic shear modulus of the shear layer may be greater than about 2 MPa but less than about 5 MPa.
  • the shear layer may have a thickness along the radial direction of greater than about 1 mm but less than about 5 mm.
  • the dynamic shear modulus of the shear layer may be about 2 MPa and the shear layer may have a thickness along the radial direction of about 2 mm.
  • the Elongation at Break at 100 0 C for the shear layer may be greater than about 100 percent, and the hysteresis for the shear layer may be less than about 0.2 at strains between about 15 percent and about 30 percent.
  • the predetermined distance by which the radially-outermost extent of the bead apex is positioned below the equator may be between about 5 mm and about 25 mm.
  • the thickness of each reinforcing member along each sidewall portion may be in a range of about 4 mm to about 8 mm.
  • Each reinforcing member along each said sidewall portion may be comprised of a plurality of rubber-based portions or may be of singular construction.
  • the Elongation at Break at 100 0 C may be greater than about 100 percent.
  • the hysteresis for each reinforcing member may be less than about 0.2 at strains between about 15 percent and about 30 percent.
  • a run-flat tire that has an equator and defines axial and radial directions.
  • the tire includes a crown portion having a tread and a shear layer disposed radially inward of the tread.
  • the shear layer has a dynamic shear modulus.
  • the shear layer has a radial thickness greater than about 1 mm but less than about 5 mm.
  • a first membrane is adhered to a radially inward extent of the shear layer.
  • a second membrane is adhered to a radially outward extent of the shear layer.
  • a ratio of the circumferential modulus in compression of either of the membranes to the dynamic shear modulus of the shear layer is at least about 100 to 1.
  • This embodiment includes a pair of axially spaced-apart, annular bead portions, where each bead portion has a bead core and a bead apex. The radially-outermost extent of the bead apex is positioned at a predetermined distance below the equator.
  • a pair of sidewall portions are provided with each sidewall portion extending radially between a respective axial edge of the crown portion and a respective bead portion.
  • Each sidewall portion has a reinforcing member that extends radially outward from a position contiguous with a respective bead apex to a position radially inward of the crown portion.
  • Each reinforcing member is of a uniform thickness over that portion extending between a respective bead apex to a position adjacent an end of the first membrane.
  • a carcass layer is disposed radially inward from the tread portion, axially inward of said pair of sidewall portions, and axially outward of each reinforcing member along each respective sidewall portion. The carcass layer extends between the pair of bead portions and is anchored on each side in a respective bead portion.
  • Fig. 1 is a cross-sectional view along a meridian plane of an exemplary embodiment of the present invention.
  • FIG. 2 is a partial perspective and cross-sectional view of the exemplary embodiment of the present invention shown in Fig. 1, illustrating various components and layers of the tire as described below.
  • FIG. 3 is a cross-sectional view along a meridian plane of another exemplary embodiment of the present invention.
  • Fig. 4 is a cross-sectional view along a meridian plane of another exemplary embodiment of the present invention.
  • the present invention provides advantageous constructions for a run-flat tire in which uniquely constructed sidewalls are provided that have a reduced thickness compared to certain previous run-flat constructions.
  • a novel crown portion is also provided that helps to control buckling while also bearing a portion of the vehicle load with the sidewalls during run-flat operation.
  • exemplary embodiments of the present invention include a shear band that assists uniquely constructed sidewall portions with carrying vehicle load for a reasonable period of run-flat operation.
  • the shear bands of the present invention are constructed in a particular manner to achieve these results without the overall thickness required for the shear layer of previously described non-pneumatic tires. The result provides an advantageous run-fiat tire that can have less weight than certain previous run-flat tire constructions while still providing for extended mobility.
  • Croferential plane means a plane perpendicular to the tire's axis of rotation and passing through the tread.
  • Compressive Modulus (E c ) as used here for the cords or cables of a ply is determined as follows.
  • a mold is fabricated of the following dimensions: a length of 50 mm, a width of 30 mm, and a thickness of 25 mm.
  • the cables are positioned precisely one relative to another in a parallel orientation using two rectangular supports (beams).
  • the cables pass through holes in these supports, which are positioned in a parallel fashion 40 mm apart from one another. The spacing between the holes ensures an accurate pace of the cables.
  • the pace reflects the pace that will be used in the ply in the tire.
  • the distance between two supports is slightly smaller than the length of the mold (50 mm), such that the supports and the cables can be placed inside the mold.
  • the cables and their supports are then placed in a mold such that the cables are located in the center of the mold in the thickness direction.
  • this means that the centerline of the cables is approximately 12.5 mm from the bottom of the mold.
  • Liquid polyurethane is poured into the mold, filling the mold.
  • the mold is placed in an oven for 24 hours at 110 0 C. After curing, the resulting sample has cables protruding from two sides in the length direction.
  • the sample is cut with a saw such that these ends are removed along with a small thickness of polyurethane.
  • the approximate final length is 40 mm.
  • the samples are placed between two metallic plateaus in an Instron testing machine of type 44666 and compressed at a rate of 25 rnrn/min.
  • the Instron machine is used to record force versus deflection.
  • the measurements are taken for at least five samples.
  • An elementary cable compression modulus is calculated by subtracting the force vs. deflection measurements of samples prepared without cables from force vs. deflection measurements of samples prepared with cables. The resulting force vs. deflection values are used to compute the effective compressive modulus of the cables using the following equations:
  • Dynamic Shear Modulus means the shear modulus measured per ASTM D5992.
  • Elongation at Break means the tensile elongation as measured by ASTM D412-98a and conducted at 100 0 C rather than ambient.
  • Equator means the radial position corresponding to the point of maximum width or axial extent of the exterior surface of the tire.
  • Equivalent homogeneous thickness means the cross sectional area of an individual cord as used in a ply divided by the pace of such cords used in the same ply.
  • Hysteresis means the dynamic loss tangent (max tan ⁇ ).
  • the dynamic characteristics of the materials are measured on an MTS 831 Elastomer Test System in accordance with ASTM
  • the material is then subjected, in a cyclic manner, to a predetermined compressive strain at a frequency of 3 Hz. Cycling is continued until the measured force at the compressive strain of 0.67 percent falls to 90 percent of its initial value, which indicates the properties of the material are beginning to degrade. The number of cycles at which this occurs is then determined. If the material can withstand at least 1,000,000 cycles at a specified compressive strain before falling to 90 percent, then as used herein, the material has an "infinite endurance limit" at the specified compressive strain.
  • Modulus of the membranes means the compressive modulus of elasticity at 1% compression in the circumferential direction multiplied by the effective thickness of the membrane. This modulus can be calculated by Equations 1 or 2 below and is denoted with a prime C) designation.
  • Pace as used herein means the distance between cords in a given ply.
  • Figs. 1 and 2 illustrate an exemplary embodiment of a run-flat tire 100 as may be constructed according to the present invention.
  • the tire defines a circumferential plane (an example is designated as CP in Fig. 1), an equator E, an axial direction with the axially outward direction denoted by arrows A, and a radial direction with the radially outward direction denoted by arrow R.
  • Tire 100 includes a crown portion 105 having a tread 110 that may be sculptured with grooves 115 or other features as are suitable for the intended use.
  • tire 100 includes a sidewall portion 120, which may be constructed from any suitable rubber material.
  • Each sidewall portion 120 extends between an axial outer edge 125 of the crown portion 105 and a bead portion 130.
  • the sidewall portions 120 help protect a carcass 135 that extends between bead cores 140 located in each bead portion 130 of the tire.
  • carcass 135 is radially inside of the tread 110 in the crown region 105 and is axially inside of the sidewall portion 120 along each side of tire 100.
  • Carcass 135 also wraps around a respective bead core 140 and a bead apex 145 on each side of tire 100.
  • the turn-up end 150 on each side of carcass 135 extends radially outward and eventually adjacent to carcass 135 itself.
  • Carcass 135 may be constructed from a variety of materials including, by way of example only, various textile materials.
  • carcass 135 may be constructed as a composite from polyester, nylon, or rayon.
  • tire 100 also includes an air impermeable inner liner 152 covering the inner surface of tire 100.
  • Inner liner 152 may be constructed from any suitable material capable of retaining the tire's inflation pressure and is preferably constructed from a halobutyl rubber.
  • tire 100 includes a pair of sidewall reinforcing members 155.
  • Each member 155 is located along a side of the tire 100 at a position that is axially inward of the carcass 135 but axially outward of inner liner 152.
  • the reinforcing members 155 extend radially from a bead portion 130 to radially inside of an annular shear band 160 in crown portion 105.
  • Each reinforcing member 155 has a "uniform" thickness along at least a portion of its length.
  • each reinforcing member 155 has a uniform thickness Ti along that portion of its length Li, which is that portion extending between a position adjacent to the radially outermost extent 165 of bead apex 145 to a position radially inward of the axial end 170 of annular shear band 160.
  • thickness T is in a range of about 4 mm to about 8 mm.
  • "uniform" includes deviations of plus or minus 2 mm.
  • a reinforcing member 155 having a thickness of 5 mm ⁇ 2 mm has a "uniform" thickness within the meaning of the present invention.
  • Bead apex 145 is constructed with a predetermined height relative to the size of tire 100.
  • L 2 is the distance between the radially outermost extent 165 of bead apex 145 and the equator E of tire 100.
  • the distance L 2 for tire 100 is preferably between about 5 mm and 25 mm.
  • Reinforcing members 155 are desirably constructed from rubber materials having a dynamic shear modulus greater than about 2 MPa but less than about 5 MPa.
  • reinforcing members 155 from one or more materials having an Elongation at Break at 100 0 C of greater than about 100 percent and a hysteresis of less than about 0.2 at strains between about 15 percent and about 30 percent.
  • tire 100 includes a shear band 160.
  • shear band 160 In order to reduce the necessary thickness of sidewall reinforcing members 155, the load borne by these members 155 during run-flat operation is reduced by having at least a portion of the vehicle load carried by way of annular shear band 160, which is constructed in a manner that also helps control buckling.
  • shear band 160 is shown to include several layers in the exemplary embodiment of tire 100, including a shear layer 175 that is positioned between a first membrane 180 and a second membrane 195.
  • Shear layer 175 is preferably constructed from rubber materials having a dynamic shear modulus greater than about 2 MPa but less than about 5 MPa, an Elongation at Break at 100 0 C of greater than about 100 percent, and a hysteresis of less than about 0.2 at strains between about 15 percent and about 30 percent.
  • shear layer 175 can have a thickness of between about 1 mm and about 5 mm.
  • shear layer 175 has a thickness of about 2 mm and a dynamic shear modulus of about 2 MPa.
  • First membrane 180 comprises a first ply 185 and second ply 190.
  • Second membrane 195 is comprised of a third ply 197.
  • the third ply 197 is offset radially inward from the bottom of the tread grooves 115 a sufficient distance to protect the structure of the second membrane 195 from cuts and small penetrations of the tread 110. The offset distance may be increased or decreased depending on the intended use of the tire.
  • plies 185, 190, and 197 each comprise essentially inextensible cables or cord reinforcements 186, 191, and 196, respectively.
  • each cord 186, 191, and 196 is embedded in an elastomeric coating.
  • first membrane 180 and second membrane 195 are adhered to shear layer 175 by the vulcanization of the elastomeric materials.
  • first and second membranes 180 and 195 may be adhered to shear layer 175 by any suitable method of chemical or adhesive bonding or mechanical fixation.
  • the cord reinforcements 186 and 191 of first membrane 180 maybe any of several materials suitable for use as tire belt reinforcements in conventional tires such as monofilaments or cords of steel, aramid, or other high modulus textiles.
  • any suitable material may be employed for the membranes which meets the requirements for the tensile stiffness, bending stiffness, and compressive buckling resistance properties required of the annular shear band 160 as described herein.
  • the structure of membranes 180 and 195 may be any of several alternatives such as a homogeneous material, a fiber reinforced matrix, or a layer having discrete reinforcing elements provided the mechanical properties described herein are met.
  • first membrane 180 first ply 185 and second ply 190 have essentially parallel cords 186 and 191.
  • cords 186 are oriented at an angle - ⁇ relative to the circumferential plane CP of tire 100 while cords 191 are oriented at an angle + ⁇ relative to the circumferential plane CP such that cords 186 and 191 have an opposite angle relative to circumferential plane CP and cross one another.
  • the absolute value of angle ⁇ will be about 20° or less.
  • Cords 186 and 191 are not required to be oriented at mutually equal and opposite angles ⁇ .
  • cords 196 are oriented in a manner that is substantially parallel to the circumferential plane CP of tire 100.
  • cords 196 are inevitably offset from the circumferential plane CP by some extent such that slight angles of, for example, up to about 5°, are still considered substantially parallel within the scope of the present invention.
  • cords 196 in third ply 197 are dispersed in a unique manner and are constructed from one or materials having certain mechanical properties. More specifically, cords 196 preferably have a compressive modulus E c of about 12,000 MPa. Alternatively, cords 196 of a higher compressive modulus may be used provided such is at least about 12,000 MPa. Preferably, cords 196 have a tensile module E t of about 40,000 MPa; a higher tensile modulus may be used provided such is at least about 40,000 MPa. Desirably, cords 196 have an infinite endurance limit at about 1.0 percent compressive strain. Cords 196 with an infinite endurance limit at higher compressions may also be used.
  • each cord 196 When constructed with the above mechanical properties, each cord 196 preferably has a cross- sectional area of about 0.43 mm or larger and are arranged at a pace of at least about 1.4 mm. Such construction provides an equivalent homogenous thickness (area per cord/pace) of about 0.30 mm 2 per mm width of ply 197. Nevertheless, regardless of how third ply 197 is constructed, it is desirable that the third ply 197 be able to repeatedly bear a compressive stresses during run-flat conditions of at least about 3600 Newtons per mm of width of the third ply 197 without incurring significant damage.
  • third ply 197 Along with reinforcing members 155 and shear layer 175 constructed as described above, such a construction for third ply 197 provides a run-fiat tire 100 capable of a reasonable period of extended mobility without adding unnecessary thickness and weight to tire 100.
  • cords 196 of third ply 197 may be used for any suitable material meeting the mechanical requirements described above.
  • a particularly desirable construction for the cords 196 of the present invention is described in U.S. Patent No. 7,032,637.
  • cords 196 may be constructed from an elongate composite element of monofilament appearance, comprising substantially symmetrical fibers that are of great lengths.
  • the fibers are impregnated in a thermoset resin having an initial modulus of extension of at least about 2.3 GPa.
  • the fibers are all configured as parallel to each other.
  • the elongate composite element has an elastic deformation in compression at least equal to 2% and having in flexion a breaking stress in compression greater than the breaking stress in extension.
  • the fiber so used to construct cord 196 may be, for example, one of various glass fibers. It is also possible to use a hybrid assembly comprising glass fibers.
  • the thermoset resin has a glass transition temperature T g greater than 130° C.
  • the cords 186, 191, and 196 of plies 185, 190, and 197, respectively, are embedded in an elastomeric coating layer. It is preferred that the dynamic shear modulus of the coating layers IS
  • the elastomeric coating layer may have a dynamic shear modulus of about 20 MPa.
  • the effective circumferential modulus E'MEMBRAN E of the first membrane 180, when in compression, using conventional tire belt materials can be estimated by the following:
  • E' MEMBRANE is the elastic modulus of the membrane times the effective thickness of the membrane. Equation 1 should be used for plies where the cord angle ⁇ is greater than about 10° from the circumferential plane of the tire.
  • the effective circumferential modulus E'MEMBRAN E of the second membrane 195 when in compression, can be estimated by the following: (2)
  • V volume fraction of the cord in the membrane
  • MEMBRANE thickness of the membrane
  • the modulus is the compressive modulus of the material or matrix. Equation 1 should be used for plies where the cord angle ⁇ is less than about 10° from the circumferential plane of the tire.
  • annular shear band 160 can effectively assist sidewall reinforcing members 155 with bearing vehicle load during run-flat operation.
  • the effective circumferential modulus E'MEMBRAN E in compression for either membrane should be at least 100 times greater than the dynamic shear modulus G of shear layer 175 and, desirably, at least about 1000 times greater. This relationship insures that during run-flat operation of tire 100 under an applied load, first and second membranes 180 and 195 maintain a substantially constant length and relative displacement of these membranes occurs substantially by shear strain in shear layer 175.
  • a tire 300 according to another exemplary embodiment of the present invention is illustrated in Fig. 3.
  • Tire 300 is similar to the exemplary embodiment of tire 100 shown in Fig. 1 with the exception of the annular shear band 360.
  • first membrane 380 is constructed of a single ply 397 in a manner similar to that described with regard to third ply 197 of tire 100.
  • cords 396 are oriented in a manner that is substantially parallel to the circumferential plane CP and are constructed from materials exhibiting physical properties as described with regard to cords 196.
  • First membrane 380 should be capable of bearing compressive stresses of at least about 3600 Newtons per mm of width without significant damage to its construction.
  • Second membrane 395 has two plies 385 and 390 that are constructed, for example, as previously described with regard to plies 185 and 190.
  • reinforcing members 355 constructed as described with regard to members 155, such a construction for annular shear band 360 provides a run-flat tire 300 capable of a reasonable period of extended mobility without adding unnecessary thickness and weight.
  • Sidewall reinforcing members 155 and 355 may be constructed as a single layer of material as shown in Figs. 1 and 3.
  • Fig. 4 shows another exemplary embodiment of a tire 400 according to the present invention in which sidewall reinforcing members 455 are actually constructed from a plurality of strips 456.
  • each reinforcing member 455 has a uniform thickness Ti along that portion of its length L
  • thickness Ti is in a range of about 4 mm to about 8 mm.
  • Reinforcing members 455 are desirably constructed from rubber materials having a dynamic shear modulus greater than about 2 MPa but less than about 5 MPa.
  • reinforcing members 455 from one or more materials having an Elongation at Break at 100 0 C of greater than about 100 percent and a hysteresis of less than about 0.2 at strains between about 15 percent and about 30 percent.
  • the remaining components of tire 400 may be constructed as described, for example, with regard to tire 100.

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

Abstract

La présente invention concerne un pneu à flancs renforcés amélioré possédant une paroi latérale unique et des parties de sommet réduisant l'épaisseur globale des matériaux requis dans ces parties du pneu. Les constructions unique décrits dans la présente invention assurent une réduction du poids des pneus à flancs renforcés de manière à permettre, par exemple, une meilleure économie durant le fonctionnement à l'état gonflé tout en permettant une distance raisonnable de mobilité étendue après une perte de pression de gonflage.
PCT/US2006/047851 2006-12-15 2006-12-15 Pneu à flancs renforcés amélioré WO2008073098A1 (fr)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010071883A1 (fr) * 2008-12-19 2010-06-24 Michelin Recherche Et Technique S.A. Performance d'aquaplanage améliorée pour un pneu
US10052919B2 (en) 2014-04-07 2018-08-21 Bridgestone Americas Tire Operations, Llc Tire with pre-stressed toroidal element
EP3159182B1 (fr) * 2014-06-20 2020-08-05 Sumitomo Rubber Industries, Ltd. Pneu sans air

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5427166A (en) * 1994-01-18 1995-06-27 Michelin Recherche Et Technique S.A. Run-flat tire with three carcass layers
US6405773B1 (en) * 2000-06-14 2002-06-18 Bridgestone/Firestone North American Tire, Llc Run flat pneumatic tire and band element therefor
US7044180B2 (en) * 2001-07-19 2006-05-16 Michelin Recherche Et Technique S.A. Run-flat insert for tires

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5427166A (en) * 1994-01-18 1995-06-27 Michelin Recherche Et Technique S.A. Run-flat tire with three carcass layers
US6405773B1 (en) * 2000-06-14 2002-06-18 Bridgestone/Firestone North American Tire, Llc Run flat pneumatic tire and band element therefor
US7044180B2 (en) * 2001-07-19 2006-05-16 Michelin Recherche Et Technique S.A. Run-flat insert for tires

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010071883A1 (fr) * 2008-12-19 2010-06-24 Michelin Recherche Et Technique S.A. Performance d'aquaplanage améliorée pour un pneu
CN102245403A (zh) * 2008-12-19 2011-11-16 米其林研究和技术股份有限公司 改进的轮胎滑水性能
US9156313B2 (en) 2008-12-19 2015-10-13 Compagnie Generale Des Establissements Michelin Hydroplaning performance for a tire
US10052919B2 (en) 2014-04-07 2018-08-21 Bridgestone Americas Tire Operations, Llc Tire with pre-stressed toroidal element
EP3159182B1 (fr) * 2014-06-20 2020-08-05 Sumitomo Rubber Industries, Ltd. Pneu sans air

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