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    • 专利摘要:
    The invention relates to a tire comprising a crown reinforcement consisting of at least two working crown layers each formed of reinforcing elements inserted between two layers of calendering rubber mix, a first layer S of polymeric mixture being in contact with each other. at least one working crown layer and in contact with the carcass reinforcement and the crown reinforcement comprising at least one layer of circumferential reinforcing elements. According to the invention, the tensile modulus of elasticity at 10% elongation of at least one calendering layer of at least one working crown layer is less than 8.5 MPa, the maximum value of tan. (δ), denoted tan (δ) max, of said at least one calendering layer of at least one working crown layer is less than 0.100 and the complex dynamic shear modulus G *, measured at 10% and 60 ° C on the return cycle, of said first layer S of polymeric mixture is greater than 1.35 MPa.
    公开号:FR3022842A1
    申请号:FR1455961
    申请日:2014-06-26
    公开日:2016-01-01
    发明作者:Hichem Rehab；Jean Francois Parmentier
    申请人:Michelin Recherche et Technique SA Switzerland ；Compagnie Generale des Etablissements Michelin SCA；Michelin Recherche et Technique SA France；
    IPC主号:
    专利说明:

    [0001] The present invention relates to a tire with a radial carcass reinforcement and more particularly to a tire intended to equip vehicles carrying heavy loads and traveling at a sustained speed, such as a tire having a radial carcass reinforcement. for example trucks, tractors, trailers or road buses. [0002] In general, in heavy-vehicle tires, the carcass reinforcement is anchored on both sides in the bead zone and is radially surmounted by a crown reinforcement consisting of at least two layers, superimposed and formed of son or parallel cables in each layer and crossed from one layer to the next in making with the circumferential direction angles between 10 ° and 45 °. Said working layers, forming the working armature, can still be covered with at least one so-called protective layer and formed of advantageously metallic and extensible reinforcing elements, called elastic elements. It may also comprise a layer of low extensibility wires or metal cables forming with the circumferential direction an angle of between 45 ° and 90 °, this so-called triangulation ply being radially located between the carcass reinforcement and the first ply of plywood. so-called working top, formed of parallel wires or cables having angles at most equal to 45 ° in absolute value. The triangulation ply forms with at least said working ply a triangulated reinforcement, which presents, under the different stresses it undergoes, few deformations, the triangulation ply having the essential role of taking up the transverse compression forces of which the object all the reinforcing elements in the area of the crown of the tire. Cables are said to be inextensible when said cables have under a tensile force equal to 10% of the breaking force a relative elongation at most equal to 0.2%. - 2 - [0004] Cables are said to be elastic when said cables have under a tensile force equal to the breaking load a relative elongation of at least 3% with a maximum tangent modulus of less than 150 GPa. [0005] Circumferential reinforcing elements are reinforcing elements which make angles with the circumferential direction in the range + 2.5 °, -2.5 ° around 0 °. The circumferential direction of the tire, or longitudinal direction, is the direction corresponding to the periphery of the tire and defined by the rolling direction of the tire. [0007] The transverse or axial direction of the tire is parallel to the axis of rotation of the tire. The radial direction is a direction intersecting the axis of rotation of the tire and perpendicular thereto. The axis of rotation of the tire is the axis around which it rotates in normal use. A radial or meridian plane is a plane which contains the axis of rotation of the tire. The circumferential mid-plane, or equatorial plane, is a plane perpendicular to the axis of rotation of the tire and which divides the tire into two halves. The term "modulus of elasticity" of a rubber mix, a secant modulus of extension at 10% deformation and at room temperature. As regards the rubber compositions, the modulus measurements are made in tension according to the AFNOR-NFT-46002 standard of September 1988: the secant modulus is measured in second elongation (ie, after an accommodation cycle). nominal (or apparent stress, in MPa) at 10% elongation (normal conditions of temperature and hygrometry according to AFNOR-NFT-40101 of December 1979). - 3 - [0014] Some current tires, known as "road" tires, are intended to run at high speed and on longer and longer journeys, due to the improvement of the road network and the growth of the motorway network in the region. world. The set of conditions under which such a tire is called to roll, undoubtedly allows an increase in the number of kilometers traveled, the wear of the tire being less; against the endurance of the latter and in particular of the crown reinforcement is penalized. There are indeed constraints at the crown reinforcement and more particularly shear stresses between the crown layers, allied to a significant increase in the operating temperature at the ends of the crown layer. axially the shortest, which result in the appearance and propagation of cracks of the rubber at said ends. In order to improve the endurance of the crown reinforcement of the tire type studied, solutions relating to the structure and quality of the layers and / or profiles of rubber compounds which are arranged between and / or around the ends of the tire. plies and more particularly the ends of the axially shortest ply have already been made. It is in particular known to introduce a layer of rubber mix between the ends of the working layers to create a decoupling between said ends to limit shear stresses. However, such decoupling layers must have a very good cohesion. Such layers of rubber compounds are described, for example, in the patent application WO 2004/076204. Patent FR 1 389 428, to improve the resistance to degradation of rubber compounds located in the vicinity of the crown reinforcement edges, recommends the use, in combination with a low hysteresis tread, of a rubber profile covering at least the sides and the marginal edges of the crown reinforcement and consisting of a rubber mixture with low hysteresis. FR 2 222 232, to avoid separations between crown reinforcement plies, teaches to coat the ends of the frame in a rubber mat, whose Shore A hardness is different from that of the strip. rolling overlying said armature, and greater than the Shore A hardness of the rubber mix profile disposed between the edges of crown reinforcement plies and carcass reinforcement. The tires thus produced can actually improve performance especially in terms of endurance. Furthermore, it is known to make tires with a very wide tread or to give tires of a given size larger load capacities to introduce a layer of circumferential reinforcing elements. The patent application WO 99/24269 describes for example the presence of such a layer of circumferential reinforcing elements. The layer of circumferential reinforcing elements is usually constituted by at least one wire rope wound to form a turn whose laying angle relative to the circumferential direction is less than 2.5 °. An object of the invention is to provide tires whose properties including endurance and wear and dynamic properties, including rigidity drift, are retained regardless of the use and whose performance in Rolling resistance terms are improved to contribute to lower fuel consumption by vehicles equipped with such tires. This object is achieved according to the invention by a radial carcass reinforcement tire comprising a crown reinforcement formed of at least two layers of working crown each formed of reinforcing elements inserted between two layers of calendering rubber mix , crossed from one layer to the other by making with the circumferential direction angles between 10 ° and 45 °, a first layer S of polymeric mixture being in contact with at least one working crown layer and in contact with the carcass reinforcement, said first polymeric mixture layer S extending axially to at least the axial end of the tread, said tread radially capping the crown reinforcement and being joined to two beads by the intermediate of two sides, the crown reinforcement comprising at least one layer of circumferential reinforcing elements, the modulus of elasticity under tension at 10% of elongation at least one calendering layer of at least one working crown layer being less than 8.5 MPa and the maximum value of tan (8), denoted tan (8), of said calendering being less than 0.100 and the complex dynamic shear modulus G *, measured at 10% and 60 ° C on the return cycle, of said first layer S of polymeric mixture being greater than 1.35 MPa. The tan loss factor (8) is a dynamic property of the layer of rubber mixture. It is measured on a viscoanalyzer (Metravib VA4000), according to ASTM D 5992-96. The response of a sample of vulcanized composition (cylindrical specimen 4 mm in thickness and 400 mm 2 in section), subjected to a sinusoidal stress in alternating simple shear, at the frequency of 10 Hz, at a temperature of 60 °, is recorded. vs. A strain amplitude sweep of 0.1 to 50% (forward cycle) and then 50% to 1% (return cycle) are performed. The results exploited are the complex dynamic shear modulus (G *) and the loss factor tan (8) measured on the return cycle. For the return cycle, the maximum value of tan (8) observed, noted [0026] The rolling resistance is the resistance that appears when the tire rolls. It is represented by the hysteretic losses related to the deformation of the tire during a revolution. The frequency values related to the revolution of the tire correspond to values of tan (8) measured between 30 and 100 ° C. The value of tan (8) at 100 ° C thus corresponds to an indicator of the rolling resistance of the rolling tire. It is still possible to estimate the rolling resistance by measuring energy losses by rebound energy samples imposed at temperatures of 60 ° C and expressed as a percentage. Advantageously according to the invention, the loss at 60 ° C, denoted P60, of said at least one calender layer of at least one working crown layer is less than 20%. According to a preferred embodiment of the invention, the modulus of elasticity under tension at 10% elongation of the calendering layers of said at least two working crown layers is less than 8.5 MPa. and the value tan (8). calender layers of said at least two working crown layers are less than 0.100. The use of such mixtures whose elastic modulus are less than 8.5 MPa and whose value tan (8). ,, is less than 0.100 to improve the properties of the tire in terms of rolling resistance in retaining satisfactory endurance properties. According to a preferred embodiment of the invention, said at least one calendering layer of at least one working crown layer is an elastomeric mixture based on natural rubber or synthetic polyisoprene with a majority of cis-chains. - 1,4 and possibly at least one other diene elastomer, the natural rubber or the synthetic polyisoprene in case of cutting being present at a majority rate relative to the rate of the other diene elastomer or other used and a reinforcing filler consisting of: a) carbon black with a BET specific surface area greater than 60 m 2 / g, i. used at a rate of between 20 and 40 phr when the Black Structure Index (COAN) is greater than 85, ii. used at a rate of between 20 and 60 phr when the black structure index (COAN) is less than 85, or (b) with carbon black with a BET specific surface area of less than 60 m2 / g, irrespective of its index of structure, employed at a level of between 20 and 80 phr, and preferably between 30 and 50 phr, c) either with a white filler of silica and / or alumina type having SiOH and / or AlOH surface functions chosen from group formed by precipitated or pyrogenic silicas, aluminas or aluminosilicates or else carbon blacks in progress or after BET specific surface area synthesis between 30 and 260 m 2 / g employed at a rate of between 20 and 80 phr and preferably between 30 and 50 phr, either by a carbon black cutting described in (a) and / or carbon black described in (b) and / or a white filler described in (c). ), in which the overall charge rate is between 20 and 80 phr, and preferably between 40 and 60 phr. BET specific surface measurement is carried out according to the method of BRUNAUER, EMMET and TELLER described in "The Journal of the American Chemical Society", vol. 60, page 309, February 1938, corresponding to the NFT standard 45007 of November 1987. The structure index of the COAN black (Compressed Oil Absorption Number) is measured according to the ASTM D3493 standard. In the case of using clear charge or white charge, it is necessary to use a coupling agent and / or covering selected from agents known to those skilled in the art. Examples of preferential coupling agents that may be mentioned are sulphurised alkoxysilanes of the bis (3-trialkoxysilylpropyl) polysulfide type, and of these, in particular, bis (3-triethoxysilylpropyl) tetrasulfide marketed by the company DEGUSSA under the Si69 denominations for pure liquid product and X5OS for solid product (50/50 by weight blend with N330 black). Examples of coating agents that may be mentioned include a fatty alcohol, an alkylalkoxysilane such as hexadecyltrimethoxy or triethoxysilane respectively marketed by DEGUSSA under the names Sil16 and Si216, diphenylguanidine, a polyethylene glycol, a silicone oil optionally modified with OH or alkoxy functions. The coating agent and / or coupling is used in a weight ratio relative to the load at 1/100 and 20/100, and preferably between 2/100 and 15/100 when the light load represents the entire the reinforcing filler and between 1/100 and 20/100 when the reinforcing filler is constituted by a carbon black and clear charge cutting. As other examples of reinforcing fillers having the morphology and SiOH and / or AlOH surface functions of the silica and / or alumina materials previously described and can be used according to the invention as a partial or total replacement thereof. the modified carbon blacks may be mentioned either during the synthesis by addition to the feed oil of the furnace of a silicon and / or aluminum compound or after the synthesis by adding, to a aqueous suspension of carbon black in a solution of silicate and / or sodium aluminate, an acid so as to at least partially cover the surface of the carbon black of SiOH and / or A10H functions. As non-limiting examples of this type of carbonaceous feedstock with SiOH and / or A10H functions at the surface, mention may be made of the CSDP type feeds described in Conference No. 24 of the ACS Meeting, Rubber Division, Anaheim, California, May 6-9. 1997 as well as those of the patent application EP-A-0 799 854. [0036] When a clear filler is used as the only reinforcing filler, the hysteresis and cohesion properties are obtained using a precipitated or fumed silica, or else a precipitated alumina or else an aluminosilicate with a BET specific surface area of between 30 and 260 m 2 / g. As non-limiting examples of this type of filler, mention may be made of the silicas KS404 from Akzo, Ultrasil VN2 or VN3 and BV3370GR from Degussa, Zeopol 8745 from Huber, Zeosil 175MP or Zeosil 1165MP from Rhodia, HI -SIL 2000 of the PPG Company, etc. Among the diene elastomers that can be used in a blend with natural rubber or a synthetic polyisoprene with a majority of cis-1,4 linkages, mention may be made of a polybutadiene (BR) preferably with a majority of cis-1,4 linkages, a styrene-butadiene copolymer (SBR) solution or emulsion, a butadiene-isoprene copolymer (BIR) or even a styrene-butadiene-isoprene terpolymer (SBIR). These elastomers may be modified elastomers during polymerization or after polymerization by means of branching agents such as divinylbenzene or starch agents such as carbonates, halogenotins, halosilicons or else by means of functionalization leading to grafting on the chain or at the end of the chain of oxygen functions carbonyl, carboxyl or an amine function such as for example by the action of dimethyl or diethylamino benzophenone. In the case of blends of natural rubber or synthetic polyisoprene with a majority of cis-1,4 linkages with one or more of the diene elastomers mentioned above, the natural rubber or the synthetic polyisoprene is preferably used at a majority rate. and more preferably at a rate greater than 70 phr. According to this preferred embodiment of the invention, a lower modulus of elasticity is generally accompanied by a lower viscous modulus G ", this evolution being favorable to a reduction of the resistance. [0039] The tensile modulus of elasticity at 10% elongation of the crown layer calenders is usually greater than 8.5 MPa and most often greater than 10 MPa. notably required to limit the compression of reinforcing elements of the working crown layers especially when the vehicle follows a winding course, when maneuvering on the car parks or during the passage of roundabouts. in the axial direction that occur on the tread in the area of the ground contacting surface lead to compression of the reinforcing elements of a layer of s SUMMARY OF THE INVENTION [0040] The inventors have demonstrated that the circumferential reinforcement element layer allows the choice of modulus of elasticity of the rubber mixes of the calender layers of the lower working crown layers without adversely affecting the properties. endurance of the tire due to compression of the reinforcing elements of said working crown layers as described above. The inventors have also been able to demonstrate that the cohesion of the calendering layers of the working crown layers, when it has a tensile modulus of elasticity at 10% elongation less than 8.5 MPa, remains satisfactory. Within the meaning of the invention, a cohesive rubbery mixture is a rubbery mixture particularly resistant to cracking. The cohesion of a mixture is thus evaluated by a fatigue cracking test performed on a specimen "PS" (pure shear).
    [0002] It consists in determining, after notching the specimen, the crack propagation rate "Vp" (nm / cycle) as a function of the energy release rate "E" (J / m2). The experimental area covered by the measurement is in the range -20 ° C and + 150 ° C in temperature, with an air or nitrogen atmosphere. The biasing of the specimen is a dynamic displacement imposed amplitude ranging between 0.lmm and 10mm in the form of impulse type stress (tangential "haversine" signal) with a rest time equal to the duration of the impulse ; the frequency of the signal is of the order of 10 Hz on average. The measurement comprises 3 parts: - An accommodation of the test tube "PS" of 1000 cycles at 27% deformation. - an energetic characterization to determine the law "E" = f (deformation). The energy release rate "E" is equal to W0 * h0, with WO = energy supplied to the material per cycle and per unit volume and h0 = initial height of the test piece. The exploitation of acquisitions "force / displacement" thus gives the relation between "E" and the amplitude of the solicitation. - The measurement of cracking, after notching of the "PS" test piece. The information collected leads to determining the propagation velocity of the crack "Vp" as a function of the imposed stress level "E". In particular, the inventors have demonstrated that the presence of at least one layer of circumferential reinforcing elements contributes to a lesser evolution of the cohesion of the layers of calendering of the working crown layers. Indeed, the more usual tire designs comprising, in particular, layers of calendering of the working crown layers with tensile modulus of elasticity at 10% elongation greater than 8.5 MPa, lead to an evolution of the cohesion of said layers of the worktop layers, which tend to weaken. The inventors find that the presence of at least one layer of circumferential reinforcing elements which contributes to limiting the compression of the reinforcement elements of the working crown layers, especially when the vehicle follows a sinuous path and furthermore limits the Increases in temperature lead to a slight change in the cohesion of the layers of calendering. The inventors thus consider that the cohesion of the caliper layers of the working crown layers, which is lower than that which exists in the more usual tire designs, is satisfactory in the design of the tire according to the invention. The inventors have also been able to demonstrate that the choice of a first layer S having a complex shear modulus G *, measured at 10% and 60 ° C. on the return cycle, greater than 1.35 MPa confers dynamic properties. and in particular tire drift rigidity properties at least as good as those of conventional tires having working crown layers whose calendering layers have stiffness modulus greater than 10 MPa. The inventors have indeed been able to demonstrate that the presence of a layer of circumferential reinforcing elements which confers additional rigidity to the tire partially compensates for the loss of rigidity of drift due to the choice of working crown layers whose layers of calendering have modulus of rigidity less than 8.5 MPa and that the characteristics stated above of the first layer S makes a significant contribution to this property of rigidity of drift. Indeed, quite unexpectedly for the skilled person, the properties of the first layer S of polymeric mixture, said layer S being positioned in contact with the carcass reinforcement and at least one layer of the crown reinforcement, have a notable influence on drift rigidity properties. The presence of a layer of circumferential reinforcing elements seemed to be able to influence the properties of drift rigidity sufficiently and a priori optimally because of the rigidity it confers on the tire. The tests carried out have demonstrated that the properties of the first layer S have a significant effect on the drift rigidity properties of the tire and make it possible to improve them even in the presence of a layer of circumferential reinforcing elements. The inventors have further demonstrated that the choice of this first layer S of polymeric mixture does not degrade the performance relative to the stresses to which the tire is subjected when traveling in a straight line. Advantageously according to the invention, the complex shear modulus G *, measured at 10% and 60 ° C on the return cycle, of the first layer S is less than 2 MPa, so that the thermal properties of the tire not too modified at the risk of degrading the endurance properties of the tire as well as its rolling resistance properties. [0048] Advantageously, the maximum value of tan (8), denoted tan (8) max, of the first layer S is less than 0.100. According to a preferred embodiment of the invention, the first polymeric mixture layer S comprises a reinforcing filler consisting of: a) carbon black with a BET specific surface area of between 30 and 160 m 2 / g, employed at a content equal to or greater than 15 phr and less than or equal to 28 phr, or (b) a white filler of silica and / or alumina type comprising SiOH and / or AlOH surface functional groups chosen from the group formed by precipitated silicas or pyrogenic, alumina or aluminosilicates or even modified carbon blacks in progress or after the specific surface synthesis of between 30 and 260 m 2 / g employed at a rate greater than or equal to 15 phr and less than or equal to 55 phr, or (c) a carbon black cut described in (a) and a white filler described in (b), in which the overall filler rate is greater than or equal to 15 phr and less than or equal to 50 phr and the load b lanche is greater than or equal to the carbon black content in pce minus 5. [0050] The inventors have also shown that the first layer S has a high enough cohesion to limit the propagation of cracks initiated when an object perforates the tread of the tire. The inventors thus highlight the achievement of a compromise of tire performance combining the dynamic properties, in particular the rigidity of drift, the rolling resistance and the endurance properties, including in the case stated above when an object pierces the tread of the tire. According to an advantageous variant of the invention, the tire comprises a second layer G of polymeric mixture radially between the carcass reinforcement and the layer of radially innermost reinforcing elements of the axially width-based crown reinforcement. at least 70% of the width of the radially innermost reinforcing layer of the crown reinforcement and having a complex shear modulus G *, measured at 10% and 60 ° C on the return cycle, greater than 1.35 MPa. According to a preferred embodiment of this variant of the invention, the axial width of said second layer G is at most equal to the width of the radially innermost reinforcing element layer of the crown reinforcement. and preferably at least 90% of the width of the radially innermost reinforcing layer of the crown reinforcement. Also preferably according to this variant of the invention, the thickness, measured in the radial direction, of said second layer G is greater than 1: 1) and preferably less than 31: 1), Il) being the diameter of the reinforcing elements of the radially innermost vertex crown reinforcement layer. The inventors have further demonstrated that the second layer G of polymeric mixture thus defined further contributes to the improvement of the rigidity properties of the tire drift in addition to the layer of circumferential reinforcing elements and the first layer S of polymeric mixture. Advantageously according to the invention, the complex shear modulus G *, measured at 10% and 60 ° C on the return cycle, of the second layer G is less than 2 MPa, so that the thermal properties of the tire not too modified at the risk of degrading the endurance properties of the tire as well as its rolling resistance properties. Advantageously, the maximum value of tan (8), denoted tan (8) max, of the second layer G is less than 0.100. According to a preferred embodiment of this variant of the invention, the second layer G of polymeric mixture comprises a reinforcing filler consisting of: a) carbon black with a specific BET surface area of between 30 and 160 m 2 / g , employed at a rate equal to or greater than 15 phr and less than or equal to 28 phr, or b) with a white filler of silica and / or alumina type having SiOH and / or AlOH surface functions chosen from the group formed by the precipitated or pyrogenic silicas, alumina or aluminosilicates or alternatively modified carbon blacks in progress or after the specific surface synthesis of between 30 and 260 m 2 / g employed at a rate greater than or equal to 15 phr and lower or equal to 55 phr, c) either by a carbon black cutting described in a) and a white filler described in b), in which the overall degree of filler is greater than or equal to 15 phr and less than or equal to 50 phr and l e rate in white charge pce is greater than or equal to the carbon black content in pce less 5. Advantageously, the polymeric mixture constituting the second layer G is identical to the polymer mixture constituting the second layer S. According to a advantageous embodiment of the invention, said reinforcing elements of at least one working crown layer are saturated layer cables, at least one inner layer being sheathed with a layer consisting of a polymeric composition such as a non-crosslinkable, crosslinkable or crosslinked rubber composition, preferably based on at least one diene elastomer. So-called "layered couds" or "multilayer" cables are cables consisting of a central core and one or more layers of strands or substantially concentric son arranged around this central core. Within the meaning of the invention, a saturated layer of a layer cable is a layer of wires in which there is not enough room to add at least one additional wire. The inventors have demonstrated that the presence of the cables as just described as strengthening elements of the working crown layers can contribute to better performance in terms of endurance. Indeed, it appears as explained above that the rubber mixtures of the calenders of the working layers can reduce the rolling resistance of the tire. This results in a lowering of the temperatures of these rubber compounds, when using the tire, which may lead to less protection of the reinforcing elements with respect to the oxidation phenomena in certain cases of use. of the tire. In fact, the properties of the rubber compounds relating to the oxygen blocking decrease with temperature and the presence of oxygen can lead to a gradual degeneration of the mechanical properties of the cables, for the most severe driving conditions, and can alter the lifetime of these cables. The presence of the rubber sheath within the cables described above compensates for this possible risk of oxidation of the reinforcing elements, the sheath contributing to the blockage of oxygen. The expression "composition based on at least one diene elastomer" is understood to mean, in a known manner, that the composition comprises predominantly (i.e. in a mass fraction greater than 50%) this or these diene elastomers. Note that the sheath according to the invention extends continuously around the layer it covers (that is to say that this sheath is continuous in the "orthoradial" direction of the cable which is perpendicular to its radius), so as to form a continuous sleeve of cross section which is preferably substantially circular. It will also be noted that the rubber composition of this sheath may be crosslinkable or crosslinked, that is to say that it comprises by definition a crosslinking system adapted to allow the crosslinking of the composition during its cooking ( ie, its hardening and not its fusion); thus, this rubber composition can be described as infusible, since it can not be melted by heating at any temperature. By elastomer or "diene" rubber is meant in known manner an elastomer derived at least in part (i.e. a homopolymer or a copolymer) of monomers dienes (monomers bearing two carbon-carbon double bonds, conjugated or not). Preferably, the crosslinking system of the rubber sheath is a so-called vulcanization system, that is to say based on sulfur (or a sulfur donor agent) - and a primary vulcanization accelerator. To this basic vulcanization system may be added various known secondary accelerators or vulcanization activators. The rubber composition of the sheath according to the invention may comprise, in addition to said crosslinking system, all the usual ingredients that can be used in tire rubber compositions, such as reinforcing fillers based on carbon black and / or a reinforcing inorganic filler such as silica, anti-aging agents, for example antioxidants, extender oils, plasticizers or agents facilitating the use of the compositions in the raw state, acceptors and donors of methylene, resins, bismaleimides, known adhesion promoter systems of the "RFS" type (resorcinol-formaldehyde-silica) or metal salts, especially cobalt salts. As a preference, the composition of this sheath is chosen to be identical to the composition used for the calender layer of the working crown layer that the cables are intended to reinforce. Thus, there is no problem of possible incompatibility between the respective materials of the sheath and the rubber matrix. According to a variant of the invention, said cables of at least one working crown layer are cables with building layers [L + M], comprising a first layer L to L son diameter d1 wound together in propeller according to a step p1 with L ranging from 1 to 4, surrounded by at least one intermediate layer C2 to M son of diameter d2 wound together in a helix in a pitch p2 with M ranging from 3 to 12, a sheath consisting of a non-crosslinkable, crosslinkable or crosslinked rubber composition based on at least one diene elastomer, covering, in the construction, said first layer C1. Preferably, the diameter of the threads of the first layer of the inner layer (C1) is between 0.10 and 0.5 mm and the diameter of the wires of the outer layer (C2) is between 0.10 and 0.5 mm. More preferably, the pitch of the winding helix of said son of the outer layer (C2) is between 8 and 25 mm. For the purposes of the invention, the pitch of the helix represents the length, measured parallel to the axis of the cable, at the end of which a wire having this pitch performs a complete revolution about the axis of the cable. cable ; thus, if the axis is divided by two planes perpendicular to said axis and separated by a length equal to the pitch of a wire of a constituent layer of the cable, the axis of this wire has in these two planes the same position on the two circles corresponding to the layer of the wire considered. Advantageously, the cable has one, and even more preferably all of the following characteristics which is verified (e): the layer C2 is a saturated layer, that is to say that it does not there is not enough space in this layer to add at least one (N + 1) th wire diameter d2, N then representing the maximum number of windable son in a layer around the layer C1; the rubber sheath also covers the inner layer C1 and / or separates the adjacent two-to-two wires from the outer layer C2; the rubber sheath substantially covers the radially inner half-circumference of each wire of the layer C2, so that it separates the adjacent two-to-two wires from this layer C2. [0077] Preferably, the rubber sheath has an average thickness ranging from 0.010 mm to 0.040 mm. In general, said cables according to the invention can be made with any type of metal son, especially steel, for example carbon steel son and / or stainless steel son. Carbon steel is preferably used, but it is of course possible to use other steels or other alloys. When carbon steel is used, its carbon content (% by weight of steel) is preferably between 0.1% and 1.2%, more preferably from 0.4% to 1.0%. % these grades represent a good compromise between the mechanical properties required for the tire and the feasibility of the wire. It should be noted that a carbon content of between 0.5% and 0.6% makes such steels ultimately less expensive because easier to draw. Another advantageous embodiment of the invention may also consist, depending on the applications concerned, of using steels with a low carbon content, for example between 0.2% and 0.5%, due in particular to lower cost and easier wire drawing. Said cables according to the invention may be obtained according to various techniques known to those skilled in the art, for example in two steps, firstly by sheathing via an extrusion head of the core or layers Cl, step followed in a second step of a final operation of wiring or twisting the remaining M son (layer C2) around the layer Cl and sheathed. The problem of stickiness in the green state posed by the rubber sheath, during any intermediate operations of winding and uncoiling can be solved in a manner known to those skilled in the art, for example by the use of an interlayer film. plastic material. Such cables of at least one working crown layer are for example selected from the cables described in patent applications WO 2006/013077 and WO 2009/083212. According to an advantageous embodiment of the invention, the axially widest working crown layer is radially inside the other working crown layers. According to an advantageous embodiment of the invention, the layer of circumferential reinforcing elements has an axial width greater than 0.5xW. W is the maximum axial width of the tire, when the latter is mounted on its service rim and inflated to its recommended pressure. The axial widths of the reinforcing element layers are measured on a cross section of a tire, the tire therefore being in a non-inflated state. According to a preferred embodiment of the invention, at least two working crown layers have different axial widths, the difference between the axial width of the axially widest working crown layer and the axial width of the layer. axially the least wide axially working vertex being between 10 and 30 mm. According to a preferred embodiment of the invention, the layer of circumferential reinforcing elements is radially arranged between two working crown layers. According to this embodiment of the invention, the layer of circumferential reinforcing elements makes it possible to limit more significantly the compression set of the reinforcement elements of the carcass reinforcement than a similar layer set up. radially outside the working layers. It is preferably radially separated from the carcass reinforcement by at least one working layer so as to limit the stresses of said reinforcing elements and do not strain them too much. Advantageously again according to the invention, the axial widths of the working crown layers radially adjacent to the layer of circumferential reinforcing elements are greater than the axial width of said layer of circumferential reinforcing elements and preferably, said working crown layers adjacent to the layer of circumferential reinforcing elements are on either side of the equatorial plane and in the immediate axial extension of the layer of circumferential reinforcing elements coupled over an axial width, to be subsequently decoupled by the layer C of rubber mixture at least over the remainder of the width common to said two working layers. The presence of such couplings between the working crown layers adjacent to the layer of circumferential reinforcing elements makes it possible to reduce tension stresses acting on the axially outermost circumferential elements and located closest to the circumferential reinforcing layer. coupling. According to an advantageous embodiment of the invention, the reinforcing elements of at least one layer of circumferential reinforcing elements are metal reinforcing elements having a secant modulus at 0.7% elongation between 10 and 120 GPa and a maximum tangent modulus less than 150 GPa. According to a preferred embodiment, the secant modulus of the reinforcing elements at 0.7% elongation is less than 100 GPa and greater than 20 GPa, preferably between 30 and 90 GPa, and even more preferably less than 30 GPa. at 80 GPa. Also preferably, the maximum tangent modulus of the reinforcing elements is less than 130 GPa and more preferably less than 120 GPa. The modules expressed above are measured on a tensile stress curve as a function of the elongation determined with a preload of 20 MPa reduced to the metal section of the reinforcing element, the tensile stress corresponding to a measured voltage brought back to the metal section of the reinforcing element. The modules of the same reinforcing elements can be measured on a tensile stress curve as a function of the elongation determined with a prestress of 10 MPa reduced to the overall section of the reinforcing element, the tensile stress corresponding to a measured voltage brought back to the overall section of the reinforcing element. The overall section of the reinforcing element is the section of a composite element made of metal and rubber, the latter having in particular penetrated the reinforcing element during the baking phase of the tire. According to this formulation relating to the overall section of the reinforcing element, the reinforcing elements of the axially outer portions and the central portion of at least one layer of circumferential reinforcing elements are metal reinforcing elements having a secant modulus at 0.7% elongation between 5 and 60 GPa and a maximum tangent modulus of less than 75 GPa. According to a preferred embodiment, the secant modulus of the reinforcing elements at 0.7% elongation is less than 50 Gpa and greater than 10 GPa, preferably between 15 and 45 GPa and more preferably less than 40 GPa. . Also preferably, the maximum tangent modulus of the reinforcing elements is less than 65 GPa and more preferably less than 60 GPa. According to a preferred embodiment, the reinforcing elements of at least one layer of circumferential reinforcement elements are metal reinforcing elements having a tensile stress versus elongation curve having low slopes for low elongations and a substantially constant and steep slope for higher elongations. Such reinforcing elements of the additional ply are usually referred to as "bi-module" elements. According to a preferred embodiment of the invention, the substantially constant and strong slope appears from a relative elongation of between 0.1% and 0.5%. The various characteristics of the reinforcing elements mentioned above are measured on reinforcing elements taken from tires. [00102] Reinforcing elements more particularly adapted to the production of at least one layer of circumferential reinforcing elements according to the invention are, for example, assemblies of formula 21.23, the construction of which is 3x (0.26 + 6x0.23). 4.4 / 6.6 SS; this strand cable consists of 21 elementary wires of formula 3 x (1 + 6), with 3 twisted strands each consisting of 7 wires, a wire forming a central core of diameter equal to 26/100 mm and 6 coiled wires of diameter equal to 23/100 mm. Such a cable has a secant module at 0.7% equal to 45 GPa and a maximum tangent modulus equal to 98 GPa, measured on a tensile stress curve as a function of the elongation determined with a preload of 20 MPa brought back to the section. of the reinforcing element, the tensile stress corresponding to a measured voltage brought back to the metal section of the reinforcing element. On a tensile stress curve as a function of the elongation determined with a preload of 10 MPa brought back to the overall section of the reinforcing element, the tensile stress corresponding to a measured tension brought back to the overall section of the element of reinforcement, this cable of formula 21.23 has a secant module at 0.7% equal to 23 GPa and a maximum tangent modulus equal to 49 GPa. In the same way, another example of reinforcing elements is an assembly of formula 21.28, the construction of which is 3x (0.32 + 6x0.28) 6.2 / 9.3 SS. This cable has a secant module at 0.7% equal to 56 GPa and a maximum tangent modulus equal to 102 GPa, measured on a tensile stress curve as a function of the elongation determined with a preload of 20 MPa reduced to the metal section of the reinforcing element, the tensile stress corresponding to a measured voltage brought back to the metal section of the reinforcing element. On a tensile stress curve as a function of the elongation determined with a preload of 10 MPa brought back to the overall section of the reinforcing element, the tensile stress corresponding to a measured tension brought back to the overall section of the element of reinforcement, this cable of formula 21.28 has a secant module at 0.7% equal to 27 GPa and a maximum tangent modulus equal to 49 GPa. The use of such reinforcing elements in at least one layer of circumferential reinforcing elements makes it possible in particular to maintain satisfactory layer rigidity, including after the shaping and baking steps in conventional manufacturing processes. According to a second embodiment of the invention, the circumferential reinforcing elements may be formed of inextensible metal elements and cut so as to form sections of length much shorter than the circumference of the least long layer, but preferably greater than 0.1 times said circumference, the cuts between sections being axially offset with respect to each other. More preferably, the tensile modulus of elasticity per unit width of the additional layer is less than the tensile modulus of elasticity, measured under the same conditions, of the most extensible working crown layer. Such an embodiment makes it possible to confer, in a simple manner, on the layer of circumferential reinforcement elements a module which can easily be adjusted (by the choice of intervals between sections of the same row), but in all cases weaker. the module of the layer consisting of the same metallic elements but continuous, the module of the additional layer being measured on a vulcanized layer of cut elements, taken from the tire. According to a third embodiment of the invention, the circumferential reinforcing elements are corrugated metal elements, the ratio a / X of the waviness amplitude over the wavelength being at most equal to 0, 09. Preferably, the tensile modulus of elasticity per unit width of the additional layer is smaller than the modulus of tensile elasticity, measured under the same conditions, of the most extensible working crown layer. The metal elements are preferably steel cables. According to a preferred embodiment of the invention, the reinforcing elements of the working crown layers are inextensible metal cables. The invention also advantageously provides for reducing the tension stresses acting on the axially outermost circumferential elements that the angle formed with the circumferential direction by the reinforcing elements of the working crown layers is less than 30 ° and preferably less than 25 °. According to another advantageous variant of the invention, the working crown layers comprise reinforcement elements, crossed from one sheet to another, making with the circumferential direction variable angles in the axial direction, said angles being higher on the axially outer edges of the reinforcing element layers with respect to the angles of said elements measured at the circumferential mid-plane.
    [0003] Such an embodiment of the invention makes it possible to increase the circumferential rigidity in certain zones and, conversely, to reduce it in others, in particular to reduce the compression of the carcass reinforcement. [00111] A preferred embodiment of the invention further provides that the crown reinforcement is completed radially outside by at least one additional layer, called protective layer, of so-called elastic reinforcing elements, oriented relative to the direction circumferential with an angle between 10 ° and 45 ° and in the same direction as the angle formed by the inextensible elements of the working layer which is radially adjacent thereto. The protective layer may have an axial width smaller than the axial width of the least wide working layer. Said protective layer may also have an axial width greater than the axial width of the narrower working layer, such that it covers the edges of the narrower working layer and, in the case of the radially upper layer, being the smallest, as it is coupled, in the axial extension of the additional reinforcement, with the widest working crown layer over an axial width, then to be axially outside, decoupled from said widest working layer by profiles of thickness at least equal to 2 mm. The protective layer formed of elastic reinforcing elements may, in the case mentioned above, be on the one hand possibly decoupled from the edges of said least wide working layer by profiles of thickness substantially less than the thickness. profiles separating the edges of the two working layers, and have on the other hand an axial width less than or greater than the axial width of the widest vertex layer. According to any one of the embodiments of the invention mentioned above, the crown reinforcement can be further completed radially inwards between the carcass reinforcement and the nearest radially inner working layer. of said carcass reinforcement, by a triangulation layer of steel non-extensible reinforcing elements making, with the circumferential direction, an angle greater than 60 ° and in the same direction as that of the angle formed by the reinforcing elements of the layer radially closest to the carcass reinforcement. The tire according to the invention as just described thus has improved rolling resistance compared to conventional tires while maintaining comparable performance in terms of endurance and wear, as well as Derivative rigidity also comparable. In addition, the lower modulus of elasticity of the rubber mixes of the working crown layer calenders make it possible to soften the crown of the tire and thus limit the risks of attacking the top and corrosion of the reinforcing elements of the tires. crown reinforcement layers when for example pebbles are retained in the sculpture grounds. Other details and advantageous features of the invention will become apparent from the description of the exemplary embodiments of the invention with reference to FIGS. 1 and 2 which represent: - figurel, a meridian view of a diagram of A tire according to a first embodiment of the invention, - Figure 2, a meridian view of a diagram of a tire according to a second embodiment of the invention. The figures are not represented in scale to simplify understanding. The figures represent only a half-view of a tire which extends symmetrically with respect to the axis XX 'which represents the circumferential median plane, or equatorial plane, of a tire. In FIG. 1, the tire 1, of dimension 315/70 R 22.5, has an aspect ratio H / S equal to 0.70, H being the height of the tire 1 on its mounting rim and S its width. axial axis. Said tire 1 comprises a radial carcass reinforcement 2 anchored in two beads, not shown in the figure. The carcass reinforcement is formed of a single layer of metal cables. This carcass reinforcement 2 is fretted by a crown reinforcement 4, formed radially from the inside to the outside: of a first working layer 41 formed of non-shrunk, inextensible, unsheathed wire ropes, which are continuous over the entire width of the web, oriented at an angle equal to 24 °, - a layer of circumferential reinforcing elements 42 formed of 21x23 steel cables, of "bi-module" type, - a second working layer 43 formed 9.28 unstretchable inextensible metal cables, continuous over the entire width of the web, oriented at an angle equal to 24 ° and crossed with the metal cables of the layer 41, - a protective layer 44 formed of elastic metal cables 6.35. The crown reinforcement is itself capped with a tread 6. [00120] The maximum axial width of the tire is equal to 317 mm. The axial width L41 of the first working layer 41 is equal to 252 mm. The axial width L43 of the second working layer 43 is equal to 232 mm.
    [0004] The difference between the widths L41 and L43 is equal to 15 mm. As for the axial width L42 of the layer of circumferential reinforcing elements 42, it is equal to 194 mm. The last crown ply 44, called the protection ply, has a width L44 equal to 124 mm. According to the invention, the modulus of elasticity under tension at 10% elongation of the calendering layers of each of the working layers 41 and 43 is equal to 6 MPa. According to the invention, a first layer S of rubber mixture is placed between the carcass reinforcement 2 and the first working layer 41. In FIG. 2, the tire 1 differs from that shown in FIG. FIG. 1 in that a second layer G axially extends the first layer S, radially between the carcass reinforcement 2 and the first working layer 41. [00128] Tests have been carried out with different tires made according to the invention according to the representation of FIG. 1 and compared with reference tires which also conform to the representation of FIG. 1. Tests are carried out in particular by varying the characteristics of the calendering mixtures of the working layers 41 and 43, in particular their modulus of elasticity under tension at 10% elongation and the value tan (5)., and the characteristics of the mixtures of the layer S, in particular the complex module of cisa G * dynamic, measured at 10% and 60 ° C on the return cycle. The various mixtures used are listed below. Mixture RI Mixture R2 Mixture 1 Mixture 2 Mixture 3 Mixture 4 Mixture 5 Mixture 6 NR 100 100 100 100 100 100 100 100 Black N347 52 33 Black N683 44 30 Black N326 47 5 - 27 - Black N330 35 Silica 165G 46 40 Antioxidant (6PPD ) 1 0.7 1.5 1 2 1 1 1.5 Stearic acid 0.65 1.4 0.9 0.65 1 0.65 0.65 1 Zinc oxide 9.3 2.1 7.5 9.3 8 9.3 9.3 5 Cobalt salt 1.12 1.12 1.12 1.1 1.12 1.12 (AcacCo) Cobalt salt (AbietateCo) Silane on black 8.3 5 sulfur 6.1 2.15 4.5 6.1 4.8 6.1 6.1 1.75 PEG 2.5 Accelerator DCBS 0.93 0.8 0.93 0.93 0.93 Accelerator TBBS 1.01 Accelerator CBS 1 0.9 Co-accelerator DPG 1.1 0 , 34 CTP retarder 0.25 0.08 0.15 0.25 0.2 0.25 0.25 PVI) MAY ° (MPa) 10.4 3.4 5.99 5.56 7.25 6.16 4.4 4.3 tan (8) '' x 0.130 0.074 0.099 0.074 0.063 0.056 0.030 0.087 P60 (%) ) 22.9 11.3 18.7 14.9 13.3 12.2 8.5 16.5 G * 10% at 60 ° C 1.25 1.55 (return cycle) [00131] The values of the constituents are expressed in phr (parts by weight per 100 parts d Elastomers [00132] Different reference tires were tested. [00133] First reference tires Ti have working layers whose calenders consist of the mixture R1 and the first layer S of the mixture R2. Second reference tires T2 have working layers whose calenders consist of mixtures 1 to 5 and the first layer S of the mixture R2. Different tires according to the invention have been tested. [00136] Si tires according to the invention were made with working layers whose calenders consist of mixtures 1 to 5, and a first layer S consisting of the mixture 6. [00137] First endurance tests were was performed on a test machine imposing on each tire a straight line rolling at a speed equal to the maximum speed index prescribed for said tire (speed index) under an initial load of 4000 Kg gradually increased to reduce the duration of the test . It turns out that all the tires tested shows substantially comparable results. Other endurance tests were performed on a test machine imposing cyclically a transverse force and a dynamic overload to the tires. The tests were carried out for the tires according to the invention with conditions identical to those applied to the reference tires. [00140] The distances traveled vary from one type of tire to another, the lapses appearing due to a degradation of the rubber compounds at the ends of the working layers. The results are expressed in the following table with reference to a base 100 fixed for the reference tire T1. Pneumatic T1 Pneumatic T2 Pneumatic S1 100 85 105 - 29 - [00141] Other rolling tests were carried out on floors unpaved consisting of particularly aggressive pebbles for the treads of tires. These last tests have shown that after identical distances traveled the tires according to the invention have less numerous alterations and less important than those of the reference tires. These tests show in particular that the design of the tires according to the invention allows a reduction in the modulus of elasticity of the calenders of the working crown layers without affecting the endurance performance when a layer of circumferential reinforcing elements is present. In addition, rolling resistance measurements have been made. These measurements relate to all the tires described above. The results of the measurements are presented in the following table; they are expressed in Kg / t, a value of 100 being attributed to the tire Ti. Pneumatic Ti Pneumatic T2 Pneumatic D 100 98 98
    权利要求:
    Claims (15)
    [0001]
    CLAIMS1 - Radial carcass reinforcement tire comprising a crown reinforcement formed of at least two working crown layers each formed of reinforcement elements inserted between two layers of rubber mix, crossed from one layer to another by making with the circumferential direction angles between 10 ° and 45 °, a first layer S of polymeric mixture being in contact with at least one working crown layer and in contact with the carcass reinforcement, said first layer of polymeric mixture extending axially to at least the axial end of the tread, said tread radially capping the crown reinforcement and being joined to two beads by means of two flanks, the crown reinforcement comprising at least one layer of circumferential reinforcing elements, characterized in that the modulus of elasticity under tension at 10% elongation at least s a calender layer of at least one working crown layer is less than 8.5 MPa, in that the maximum value of tan (8), denoted tan (8) max, of said at least one calendering layer at least one working crown layer is less than 0.100 and in that the dynamic shear complex modulus G *, measured at 10% and 60 ° C on the return cycle, of said first polymeric mixture layer S is greater than at 1.35 MPa.
    [0002]
    2 - A tire according to claim 1, characterized in that the complex shear modulus G *, measured at 10% and 60 ° C on the return cycle, of the first layer S is less than 2 MPa.
    [0003]
    3 - A tire according to one of claims 1 or 2, characterized in that the maximum value of tan (8), denoted tan (8) max, of the first layer S is less than 0.100.
    [0004]
    4 - A tire according to one of the preceding claims, characterized in that said first polymeric mixture layer S comprises a reinforcing filler consisting of: a) carbon black with a specific BET surface area of between 30 and 160 m 2 / g, employed at a rate equal to or greater than 15 phr and less than or equal to 28 phr, or b) with a white filler of silica and / or alumina type having SiOH and / or AlOH surface functions chosen from the group formed by silicas. precipitated or pyrogenic, alumina or aluminosilicates or carbon blacks modified in course or after the specific surface synthesis of between 30 and 260 m 2 / g used at a rate greater than or equal to 15 pce and lower or equal to 55 phr, c) either by a cut of carbon black described in a) and a white charge described in b), in which the overall charge rate is greater than or equal to 15 phr and less than or equal to 50 pce and the rate in white pce is greater than or equal to the carbon black content in pce less
    [0005]
    5. A tire according to one of the preceding claims, characterized in that said at least one calender layer of at least one working crown layer is an elastomeric mixture based on natural rubber or synthetic polyisoprene with a majority of cis-1,4 linkages and possibly at least one other diene elastomer, the natural rubber or the synthetic polyisoprene in case of cutting being present at a majority rate relative to the rate of the other diene elastomer or diene elastomers used and a reinforcing filler consisting of: a) carbon black with a BET specific surface area greater than 60 m 2 / g, i. used at a rate of between 20 and 40 phr when the Black Structure Index (COAN) is greater than 85, ii. used at a rate of between 20 and 60 phr when the black structure index (COAN) is less than 85, or (b) with carbon black with a BET specific surface area of less than 60 m2 / g, irrespective of its index of structure, employed at a level of between 20 and 80 phr, and preferably between 30 and 50 phr, c) either with a white filler of silica and / or alumina type having SiOH and / or AlOH surface functions chosen from group formed by precipitated or pyrogenic silicas, aluminas or aluminosilicates or else carbon blacks in progress or after BET specific surface area synthesis between 30 and 260 m 2 / g employed at a rate of between 20 and 80 phr , and preferably between 30 and 50 phr, or (d) by a carbon black cutting described in (a) and / or carbon black described in (b) and / or a white filler described in (c). ), in which the overall charge rate is between 20 and 80 phr, and preferably between 40 and 60 phr.
    [0006]
    6 - A tire according to one of the preceding claims, said tire comprising a second layer G of polymeric mixture axially in contact with the first layer S of polymeric mixture radially between the carcass reinforcement and the layer of reinforcing elements radially most interior of the crown reinforcement, characterized in that the complex dynamic shear modulus G *, measured at 10% and 60 ° C on the return cycle, of said second layer G of polymeric mixture is greater than 1.35 MPa.
    [0007]
    7 - A tire according to claim 6, characterized in that the complex shear modulus G *, measured at 10% and 60 ° C on the return cycle, of the second layer G is less than 2 MPa.
    [0008]
    8 - A tire according to one of claims 6 or 7, characterized in that the maximum value of tan (8), denoted tan (8) max, of the second layer G is less than 0.100.
    [0009]
    9 - A tire according to one of claims 6 to 8, characterized in that said second layer G of polymeric mixture comprises a reinforcing filler consisting of: a) carbon black BET specific surface area of between 30 and 160 m2 / g , employed at a rate equal to or greater than 15 phr and less than or equal to 28 phr, or b) with a white filler of silica and / or alumina type having SiOH and / or AlOH surface functions chosen from the group formed by the precipitated or fumed silicas, alumina or aluminosilicates or alternatively modified carbon blacks in progress or after the specific surface synthesis of between 30 and 260 m 2 / g employed at a rate greater than or equal to 15 phr and less than or equal to 55 phr, c) either by a cutting of carbon black described in a) and a white charge described in b), in which the overall charge rate is greater than or equal to 15 phr and less than or equal to 50 phr and the rate in white charge is greater than or equal to the carbon black content in minus 5.-
    [0010]
    10 - tire according to one of the preceding claims, characterized in that said reinforcing elements of at least one working crown layer are saturated layer cables, at least one inner layer being sheathed with a layer consisting of a polymeric composition such as a non-crosslinkable, crosslinkable or crosslinked rubber composition, preferably based on at least one diene elastomer.
    [0011]
    11 - A tire according to one of the preceding claims, characterized in that the layer of circumferential reinforcing elements is radially disposed between two working crown layers.
    [0012]
    12 - A tire according to one of the preceding claims, characterized in that the reinforcing elements of at least one layer of circumferential reinforcing elements are metal reinforcing elements having a secant modulus at 0.7% elongation included between 10 and 120 GPa and a maximum tangent modulus less than 150 GPa.
    [0013]
    13 - A tire according to one of the preceding claims, characterized in that the reinforcing elements of the working crown layers are inextensible.
    [0014]
    14 - A tire according to one of the preceding claims, characterized in that the crown reinforcement is completed radially outwardly by at least one additional sheet, called the protective layer, of so-called elastic reinforcing elements, oriented with respect to the circumferential direction with an angle between 10 ° and 45 ° and in the same direction as the angle formed by the inextensible elements of the working ply which is radially adjacent thereto.
    [0015]
    15 - tire according to one of the preceding claims, characterized in that the crown reinforcement further comprises a triangulation layer formed of metal reinforcing elements making with the circumferential direction angles greater than 60 °.
    类似技术:
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    同族专利:
    公开号 | 公开日
    US10442247B2|2019-10-15|
    CN106470848B|2018-04-17|
    JP2017521303A|2017-08-03|
    BR112016029352B1|2021-02-23|
    BR112016029352A2|2018-11-27|
    EP3160766A2|2017-05-03|
    US20170203612A1|2017-07-20|
    WO2015197290A3|2016-05-06|
    WO2015197290A2|2015-12-30|
    EP3160766B1|2018-08-22|
    FR3022842B1|2016-06-10|
    CN106470848A|2017-03-01|
    引用文献:
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    FR2981297B1|2011-10-13|2013-10-25|Michelin Soc Tech|PNEUMATIC COMPRISING A LAYER OF CIRCUMFERENTIAL REINFORCING ELEMENTS|FR3069189A1|2017-07-21|2019-01-25|Compagnie Generale Des Etablissements Michelin|PNEUMATIC HAVING IMPROVED WEAR AND ROLL RESISTANCE PROPERTIES|
    法律状态:
    2015-06-19| PLFP| Fee payment|Year of fee payment: 2 |
    2016-01-01| PLSC| Search report ready|Effective date: 20160101 |
    2016-06-27| PLFP| Fee payment|Year of fee payment: 3 |
    2017-06-21| PLFP| Fee payment|Year of fee payment: 4 |
    2018-06-20| PLFP| Fee payment|Year of fee payment: 5 |
    2020-03-13| ST| Notification of lapse|Effective date: 20200206 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1455961A|FR3022842B1|2014-06-26|2014-06-26|PNEUMATIC COMPRISING A LAYER OF CIRCUMFERENTIAL REINFORCING ELEMENTS|FR1455961A| FR3022842B1|2014-06-26|2014-06-26|PNEUMATIC COMPRISING A LAYER OF CIRCUMFERENTIAL REINFORCING ELEMENTS|
    BR112016029352-5A| BR112016029352B1|2014-06-26|2015-05-27|tire comprising a layer of circumferential reinforcing elements|
    PCT/EP2015/061707| WO2015197290A2|2014-06-26|2015-05-27|Tyre comprising a layer of circumferential reinforcing elements|
    JP2016575455A| JP2017521303A|2014-06-26|2015-05-27|Tire having a layer of circumferential reinforcing elements|
    EP15724684.4A| EP3160766B1|2014-06-26|2015-05-27|Tyre comprising a layer of circumferential reinforcing elements|
    CN201580034768.3A| CN106470848B|2014-06-26|2015-05-27|Include the tire of circumferential reinforcing element layer|
    US15/321,623| US10442247B2|2014-06-26|2015-05-27|Tire comprising a layer of circumferential reinforcement elements|
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