WO2018118479A1 - Pneu de poids lourd - Google Patents

Pneu de poids lourd Download PDF

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Publication number
WO2018118479A1
WO2018118479A1 PCT/US2017/065560 US2017065560W WO2018118479A1 WO 2018118479 A1 WO2018118479 A1 WO 2018118479A1 US 2017065560 W US2017065560 W US 2017065560W WO 2018118479 A1 WO2018118479 A1 WO 2018118479A1
Authority
WO
WIPO (PCT)
Prior art keywords
tread
layer compound
compound
heavy truck
truck tire
Prior art date
Application number
PCT/US2017/065560
Other languages
English (en)
Inventor
Paul Andrew MAYNI
Jeremy Trowbridge
Original Assignee
Compagnie Generale Des Etablissements 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 Compagnie Generale Des Etablissements Michelin filed Critical Compagnie Generale Des Etablissements Michelin
Publication of WO2018118479A1 publication Critical patent/WO2018118479A1/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
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/0041—Tyre tread bands; Tread patterns; Anti-skid inserts comprising different tread rubber layers
    • B60C11/005—Tyre tread bands; Tread patterns; Anti-skid inserts comprising different tread rubber layers with cap and base layers
    • 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
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/032—Patterns comprising isolated recesses
    • B60C11/0323—Patterns comprising isolated recesses tread comprising channels under the tread surface, e.g. for draining water
    • 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
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1204—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe
    • B60C11/1218—Three-dimensional shape with regard to depth and extending direction
    • 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
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1272—Width of the sipe
    • B60C11/1281—Width of the sipe different within the same sipe, i.e. enlarged width portion at sipe bottom or along its length
    • 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
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/0008—Tyre tread bands; Tread patterns; Anti-skid inserts characterised by the tread rubber
    • B60C2011/0016—Physical properties or dimensions
    • B60C2011/0025—Modulus or tan delta
    • 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
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/0008—Tyre tread bands; Tread patterns; Anti-skid inserts characterised by the tread rubber
    • B60C2011/0016—Physical properties or dimensions
    • B60C2011/0033—Thickness of the tread
    • 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
    • B60C2200/00—Tyres specially adapted for particular applications
    • B60C2200/06—Tyres specially adapted for particular applications for heavy duty vehicles

Definitions

  • This invention relates generally to tires. More specifically, this invention relates to tires for heavy trucks, in particular tires for free-rolling wheels thereof (so-called steer axle positions and trailer axle positions), especially tires for steer positions.
  • Irregular tread wear also called “uneven wear” or “abnormal wear”
  • tread wear is a great concern for heavy commercial vehicle tires as it can progressively induce tire vibrations that become sensed by the driver through the steering wheel. It can also make for a poor looking wear pattern. Both of these undesired effects often lead to the tire being removed from service at an early stage of its wear life. Generally, the more the tire is put through a slow-wearing usage, the more irregular wear is affecting the removal mileage. This is why resistance to irregular wear is of paramount importance for truck tires in the so-called long haul steer usage.
  • the tread of those tires use a combination of two main layers of different rubber compounds laid on top of each other.
  • the ground contacting upper layer being a more hysteretic compound than the lower layer.
  • Those treads also feature a directional tread pattern including partial sipes on the side of the tread ribs.
  • the partial sipes are inclined relative to the radial direction of the tire (that is to say relative to the thickness direction of the tread).
  • the resistance to irregular wear is increased by having the partial sipes inclined by an angle of between 5° and 15° in a given direction relative to the rolling direction of the tire.
  • the performance of such tires is therefore sensitive to the direction they are mounted on the vehicle and later used on the road.
  • Such rolling direction indicators are generally arrows pointing in the direction in which the tread should be moving towards while the tire is rolling during forward displacement of the vehicle.
  • the invention provides for a heavy truck tire having a casing and a rubber tread attached thereto, the tread extending axially between tread edges over a rolling tread width (RTW), the tread comprising a lower rubber layer and an upper rubber layer, the upper rubber layer being intended to come into contact with the ground and the lower rubber layer being attached to the casing, the upper rubber layer consisting in an upper layer compound and the lower rubber layer consisting in a lower layer compound, the lower layer compound being different from the upper layer compound, wherein the lower layer compound has a max tan(5) not greater than 0.07 and the upper layer compound has a max tan(5) of at least 0.15.
  • a boundary between the upper and lower rubber layers is not higher than 6 mm above the tread bottom profile.
  • the boundary between the upper and lower rubber layers is higher than 2 mm above the tread bottom profile within at least 90% of RTW.
  • the lower layer compound has a max tan(5) not greater than 0.065 and the upper layer compound has a max tan(5) of at least 0.17.
  • the lower layer compound has a max tan(5) not greater than 0.06 and the upper layer compound has a max tan(5) of at least 0.18.
  • the upper layer compound has a complex shear modulus for 25% strain (G*25) at 60°C not greater than 2.1 MPa.
  • the upper layer compound has a complex shear modulus for 25% strain (G*25) at 60°C not greater than 1.9 MPa.
  • the lower layer compound has a complex shear modulus for 25% strain (G*25) at 60°C not greater than 1.9 MPa.
  • the lower layer compound has a complex shear modulus for 25% strain (G*25) at 60°C not greater than 1.7 MPa.
  • the tread has no sacrificial ribs.
  • the tread has no directional sipes.
  • the lower rubber layer is fully covered by the upper rubber layer and wherein the lower layer compound has a max tan(5) not greater than 0.055 and the upper layer compound has a max tan(5) of at least 0.18. tread has no sacrificial ribs.
  • the lower layer compound has a max tan(5) not greater than 0.05 and the upper layer compound has a max tan(5) of at least 0.20.
  • the lower layer compound has a max tan(5) not greater than 0.04 and the upper layer compound has a max tan(5) of at least 0.22.
  • the boundary between the upper and lower rubber layers is higher than 2 mm below the tread bottom profile and is not higher than 4 mm above the tread bottom profile within at least 90% of RTW.
  • a distance "d" separates the lower rubber layer from the groove surfaces, d being greater than 1 mm.
  • FIG. 1 is schematic perspective section view of a tire according to the prior art.
  • FIG. 2 is a schematic view of a detail of the tire of FIG. I.
  • FIG. 3 is a schematic section view of a tire according to a first embodiment of the invention.
  • FIG. 4 is a schematic section view of a tire according to another embodiment of the invention.
  • FIG. 1 is showing in a schematic way relevant features of a commercially available tire sold as MICHELIN ® XZA3 ® + EVERTREAD ® or MICHELIN ® X LINETM ENERGY Z.
  • This tire 100 has a pair of beads (not shown), respective sidewalls 101, 102 and a belt structure 103 that together constitute what is generally referred to as a tire casing.
  • a tread 200 is attached to this casing.
  • the tire has a circumferential direction that corresponds to the longitudinal direction of the tread and is often represented as the oX direction in an oXYZ coordinate system.
  • the tire and tread have an axial direction (also referred to as the lateral or transverse direction) that corresponds to the oY direction in said oXYZ coordinate system.
  • the tire has a radial direction that corresponds to the thickness direction or depth direction of the tread and is represented as the oZ direction in said oXYZ coordinate system.
  • the tread of tire 100 has five longitudinal main ribs 201, 202, 203, 204 and 205.
  • the main ribs are separated by main grooves 213, 214, 215 and 216.
  • This tread also has so-called sacrificial ribs 206 and 207 outside the main ribs on either side of the tread.
  • the sacrificial ribs are separated from the main ribs by respective sacrificial grooves 208 and 209.
  • the ground contacting surface of the sacrificial ribs is offset from the ground contacting surface CS of the main ribs. Sacrificial ribs are known to improve the resistance of the tread to irregular wear in the shoulder areas.
  • a rolling tread width RTW is defined as the distance between tread edges.
  • the tread edges are defined as the maximum axial locations where the tread of the tire no longer comes in contact with the ground under standard, straight rolling conditions (75% of the TRA load at standard pressure for the tire). These locations do not account for tread that may intermittently come in contact (such as is the case for a sacrificial rib).
  • tread 200 is made up of two tread rubber layers, a lower (radially internal) rubber layer and an upper (radially external) rubber layer. Each of said layers uses a different rubber compound.
  • the lower rubber layer 211 consists in a lower layer compound and the upper rubber layer 212 consists in an upper layer compound.
  • the boundary between the two rubber layers is set parallel to the ground contacting surface CS about 4 mm above the bottom of the main grooves.
  • the sacrificial ribs 206 and 207 are made exclusively from the lower layer compound.
  • the lower layer compound has a substantially lower loss factor than the upper layer compound. It also has a slightly lower complex dynamic shear modulus than the upper layer compound. Because the lower layer compound has a very low electrical conductivity, a central projection 217 from the upper rubber layer in the center main rib is designed to create a permanent electrical conduction path between the ground and the metallic belt structure 103 for allowing the discharge of static electricity.
  • the example tread of the prior art also includes partial sipes 218 on the sides of its main ribs.
  • FIG. 2 is showing more details of those partial sipes 218 in a schematic partial section view taken in a plane parallel to the meridian plane (XoZ plane) of the tire of FIG. 1 and next to a main groove.
  • the partial sipes extend from the ground contact surface CS, through the full upper layer 212 and down into the lower layer 211.
  • This detail view illustrates the fact that the partial sipes of this tread are inclined relative to the radial direction Z by an angle a in the order of 9°.
  • the partial sipes are inclined from the radial direction Z in the direction opposite to the rolling direction RD of the tread.
  • such directional siping has proven to be effective against irregular wear.
  • FIG. 3 shows in a detailed section view the crown portion of a tire 300 according to a first embodiment. Only half of the crown portion is shown as clearly illustrated by the equatorial plane EP. Relative to equatorial plane EP, the other half of the tire may be substantially symmetric to the one shown. The other half may also be notably different form the first one as long as it remains within the scope of the invention as limited by the claims.
  • the tread has five main ribs and four longitudinal grooves.
  • a shoulder groove 413 separates the shoulder rib 401 from the intermediate rib 402 and an intermediate groove 414 separates the intermediate rib 402 from the center rib 403.
  • the tread 400 is made from two different layers, a lower rubber layer 411 and an upper rubber layer 412. The boundary 410 between the two layers runs substantially parallel to the contact surface CS of the tread.
  • the rubber compound for the upper layer 412 is much more hysteretic than the compound for the lower layer 411.
  • the upper layer compound has a loss factor "max tan(5)" of 0.19 while the lower layer compound has a max tan(5) of 0.06.
  • a projection 417 of the upper layer compound is connecting the tire casing 303 through the lower layer 411 as part of the center rib 403.
  • the outer profile OP of a tread is defined as the curved line that follows the tread contact surface CS in a radial section.
  • the bottom profile BP of a tread is generally defined as the translation of the outer profile OP down to the bottom of the deepest grooves of that tread (ignoring wear bars).
  • the position of the boundary 410 between the upper and lower layers can then be described relative to the position of the bottom profile BP.
  • the boundary between the two layers is in the order of 4 mm above the tread bottom profile and substantially parallel to it (with the exception of the conductive projection 417 of course).
  • the lower layer 411 is apparent at the bottom of the grooves 413, 414.
  • FIG. 4 shows the tread portion of a tire 500 according to another embodiment.
  • the lower layer 611 of tread 600 is not surfacing at the bottom of the grooves.
  • the grooves are fully embedded in the upper layer 612.
  • a distance "d" can be measured between the surface of the grooves and the boundary 610.
  • the boundary does not run parallel to bottom profile BP but remains between within about 2 mm below and about 4 mm over BP within 90% of RTW. Beyond this limit of 90%, that is to say adjacent the tread edges, the boundary may be more distant from BP, for instance due to manufacturing constraints or variations.
  • the lower layer compound has a max tan(5) of 0.03, being substantially less hysteretic than in the first embodiment.
  • the upper layer compound has a max tan(5) of 0.22 being substantially more hysteretic than in the first embodiment.
  • FIG. 4 also shows a different groove type for the intermediate groove 614. This groove is a hidden groove where a channel 615 is running below the contact surface CS and is connected to the surface by an undulated sipe 616. The channel may run parallel to the surface around the whole circumference of the tire or undulate between a lower position as shown in this section view and a higher position where it is surfacing at the contact surface CS.
  • FIG. 4 also shows a different approach to ensuring the right level of electrical conductivity through the tread.
  • a conductive rubber strip 617 is inserted in the center of the tread. This rubber strip may use the same or a different compound compared to the upper layer 612.
  • the rubber compounds used for the lower and upper layers may be based upon natural rubber or upon synthetic polyisoprene with a majority of cis-1,4 chains and possibly on at least one other diene elastomer and of a reinforcing filler consisting:
  • a white filler of the silica and/or alumina type having SiOH and/or AIOH surface functions selected from the group formed by precipitated or pyrogenic silicas, aluminas or aluminosilicates, with a specific surface area in the range between 120 and 200m2/g, used in a loading between 0 phr and 70 phr,
  • phr is "parts per hundred parts of rubber by weight” and is a common measurement in the art wherein components of a rubber composition are measured relative to the total weight of rubber in the composition, i.e., parts by weight of the component per 100 parts by weight of the total rubber(s) in the composition.
  • CTAB specific surface area is determined according to AFNOR Standard NFT 45-007 (November 1987, method B).
  • a coupling and/or coating agent chosen from agents known to those skilled in the art, must be used.
  • preferred coupling agents are sulphurized alkoxysilanes of the bis-(3-trialkoxysilylpropyl) polysulphide type, and of these, notably, the bis(3-triethoxysilylpropyl) tetrasulphide marketed by Degussa under the trade names Si69 for the pure liquid product and X50S for the solid product (blended 50/50 by weight with N330 black).
  • coating agents examples include fatty alcohol, alkylalkoxysilane such as hexadecyltrimethoxy or triethoxy silane marketed by Degussa under the trade names Si 116 and Si216 respectively, diphenylguanidine, polyethylene glycol, and silicone oil, modified by means of the OH or alkoxy functions if required.
  • the coating and/or coupling agent is used in a proportion of between 1/100 and 20/100 by weight to the filler, and preferably in the range from 2/100 to 15/100 if the clear filler forms the whole of the reinforcing filler and in the range from 1/100 to 20/100 if the reinforcing filler is formed by a blend of carbon black and clear filler.
  • reinforcing fillers having the morphology and SiOH and/or AIOH surface functions of the materials of the silica and/or alumina type described above and suitable for use according to the invention in total or partial replacement of these, that may be mentioned include carbon blacks modified either during synthesis by the addition of a silicon and/or aluminium compound to the oil supplied to the furnace, or after synthesis by the addition of an acid to an aqueous suspension of carbon black in a sodium silicate and/or aluminate solution so as to coat at least part of the surface of the carbon black with SiOH and/or AIOH functions.
  • a clear filler is used as the sole reinforcing filler, the properties of hysteresis and cohesion are obtained by using a precipitated or pyrogenic silica or a precipitated alumina or an aluminosilicate with a CTAB specific surface area in the range from 120 to 180 m2/g.
  • silicas KS404, marketed by Akzo, Ultrasil VN2 or VN3 and BV3370GR marketed by Degussa, Zeopol 8745 marketed by Huber, Zeosil 175MP or Zeosil 11 65M marketed by Rhodia, HI-SIL 2000 marketed by PPG, etc.
  • diene elastomers that may be used in a blend with natural rubber or a synthetic polyisoprene with a majority of cis-1,4 chains
  • BR polybutadiene
  • SBR stirene-butadiene copolymer
  • BIR butadiene-isoprene copolymer
  • SBIR stirene-butadiene-isoprene terpolymer
  • elastomers may be elastomers modified during polymerization or after polymerization by means of branching agents such as divinylbenzene or star forming agents such as carbonates, tin halogens and silicon halogens, or alternatively by means of functionalizing agents causing oxygenated carbonyl, carboxyl functions or an amine function to be grafted on to the chain or at the end of the chain, by the action of dimethyl- or diethylamino-benzophenone for example.
  • branching agents such as divinylbenzene or star forming agents such as carbonates, tin halogens and silicon halogens
  • functionalizing agents causing oxygenated carbonyl, carboxyl functions or an amine function to be grafted on to the chain or at the end of the chain, by the action of dimethyl- or diethylamino-benzophenone for example.
  • the natural rubber or synthetic polyisoprene is preferably used in a majority proportion and more preferably in a proportion of more than 70 phr.
  • the two elastomeric main compounds that constitute the tread as in FIG. 3, may be as described in the table below.
  • Anti-Degradants such as Paraffin
  • Cure Package (such as Stearic acid,
  • the two elastomeric main compounds that constitute the tread as in FIG. 4 may be as described in the table below.
  • Anti-Degradants such as Paraffin
  • Cure Package (such as Stearic acid,
  • the loss factor "tan(5)” is a dynamic property of the rubber compound. It is measured on a viscosity analyzer (Metravib VA4000) according to Standard ASTM D5992-96. The response of a test specimen consisting of two cylindrical pellets each 2 mm thick and one centimeter in diameter is recorded (the test specimen is made from samples taken from a tire mid-way up the height of the layer concerned as close as possible to the region of the equatorial plane in a region that is thick enough to be able to form the test specimen), the specimen being subjected to simple alternating sinusoidal shear loadings at a frequency of 10 Hz, at a temperature of 60° C.
  • the sweep covers amplitude of deformation from 0.1% to 25% peak to peak (on the outbound cycle) then from 25% to 1% peak to peak (on the return cycle).
  • the results that are used here are the loss factor tan(5) and the complex dynamic shear modulus.
  • the complex dynamic shear modulus is denoted "G*25” in reference to the 25% strain applied during the test.
  • the maximum value of tan5 that is observed is denoted "max tan(5)”.

Abstract

L'invention concerne un pneu (500) de poids lourd comprenant une carcasse et une bande de roulement en caoutchouc (600) fixée à celle-ci, la bande de roulement s'étendant axialement entre des bords de bande de roulement sur une largeur de bande de roulement (RTW), la bande de roulement comprenant une couche de caoutchouc inférieure (611) et une couche de caoutchouc supérieure (612), la couche de caoutchouc supérieure étant destinée à entrer en contact avec le sol et la couche de caoutchouc inférieure étant fixée à la carcasse, la couche de caoutchouc supérieure étant constituée d'un composé de couche supérieure et la couche de caoutchouc inférieure étant constituée d'un composé de couche inférieure, le composé de la couche inférieure étant différent du composé de la couche supérieure, le composé de la couche inférieure ayant un tan(δ) max inférieur ou égal à 0,07 et le composé de la couche supérieure ayant un tan(δ) max supérieur ou égal à 0,15.
PCT/US2017/065560 2016-12-20 2017-12-11 Pneu de poids lourd WO2018118479A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
USPCT/US2016/067754 2016-12-20
PCT/US2016/067754 WO2018118023A1 (fr) 2016-12-20 2016-12-20 Pneu de poids lourd

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WO2018118479A1 true WO2018118479A1 (fr) 2018-06-28

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PCT/US2017/065560 WO2018118479A1 (fr) 2016-12-20 2017-12-11 Pneu de poids lourd

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JP7116709B2 (ja) * 2019-06-14 2022-08-10 株式会社ブリヂストン 空気入りタイヤ
JP7152362B2 (ja) * 2019-06-14 2022-10-12 株式会社ブリヂストン 空気入りタイヤ
JP7177009B2 (ja) * 2019-06-14 2022-11-22 株式会社ブリヂストン 空気入りタイヤ
JP7278899B2 (ja) * 2019-07-31 2023-05-22 Ｔｏｙｏ Ｔｉｒｅ株式会社 空気入りタイヤ
JP2022076708A (ja) * 2020-11-10 2022-05-20 住友ゴム工業株式会社 タイヤ

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0799854A1 (fr) 1995-10-25 1997-10-08 The Yokohama Rubber Co., Ltd. Composition a base de caoutchouc comportant du noir de carbone presentant une surface traitee au dioxyde de silicium
US6196288B1 (en) 1997-12-15 2001-03-06 Michelin Recherche Et Technique S.A. Siping geometry to delay the onset of rib edge wear in truck tires
US20120298271A1 (en) * 2009-11-26 2012-11-29 Michelin Recherche Et Technique S.A. Tire for a vehicle carrying heavy loads
US20150158338A1 (en) * 2012-07-05 2015-06-11 Michelin Recherche Et Technique, S.A. Tire comprising a tread formed by multiple elastomer blends
WO2015158871A1 (fr) * 2014-04-18 2015-10-22 Compagnie Generale Des Etablissements Michelin Bande de roulement de pneumatique pour vehicule a usage agricole
US9352615B2 (en) * 2013-10-22 2016-05-31 The Goodyear Tire & Rubber Company Pneumatic tire with multi-tread cap

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0799854A1 (fr) 1995-10-25 1997-10-08 The Yokohama Rubber Co., Ltd. Composition a base de caoutchouc comportant du noir de carbone presentant une surface traitee au dioxyde de silicium
US6196288B1 (en) 1997-12-15 2001-03-06 Michelin Recherche Et Technique S.A. Siping geometry to delay the onset of rib edge wear in truck tires
US20120298271A1 (en) * 2009-11-26 2012-11-29 Michelin Recherche Et Technique S.A. Tire for a vehicle carrying heavy loads
US20150158338A1 (en) * 2012-07-05 2015-06-11 Michelin Recherche Et Technique, S.A. Tire comprising a tread formed by multiple elastomer blends
US9352615B2 (en) * 2013-10-22 2016-05-31 The Goodyear Tire & Rubber Company Pneumatic tire with multi-tread cap
WO2015158871A1 (fr) * 2014-04-18 2015-10-22 Compagnie Generale Des Etablissements Michelin Bande de roulement de pneumatique pour vehicule a usage agricole

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