• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The tire (10) for a civil engineering vehicle comprises a tread (22) and a crown reinforcement (14) arranged radially inside the tread (22). The crown reinforcement (14) comprises: - a protective reinforcement (36) comprising at least one protective ply (42, 44) having a breaking force FmNSP; and a working armature (38) comprising at least one working ply (46, 48) having a breaking force FmNST. The working armature (38) is arranged radially inside the protective armature (36). The FmNSP / FmNST ratio is greater than or equal to 0.27 and less than or equal to 0.90.
    公开号:FR3020017A1
    申请号:FR1453593
    申请日:2014-04-22
    公开日:2015-10-23
    发明作者:Alain Domingo；Emmanuel Clement；Pascal Ragot
    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] - 1 - [1] The invention relates to a tire, especially for civil engineering vehicles. [2] There is known from the state of the art a tire for civil engineering vehicle with a radial carcass reinforcement comprising a tread, two inextensible beads, two flanks connecting the beads to the tread and a crown reinforcement, disposed circumferentially between the carcass reinforcement and the tread. This crown reinforcement comprises several layers of rubber, possibly reinforced by reinforcing elements such as metal cables. [003] The crown reinforcement comprises at least two superimposed layers, called working plies, whose reinforcing ropes are disposed substantially parallel to each other inside a ply, but crossed with a ply of plywood. other, that is to say, inclined, symmetrically or otherwise, with respect to the median circumferential plane, an angle which is generally between 15 ° and 40 ° depending on the type of tire considered. [004] The crown reinforcement also comprises one or more so-called protective plies responsible for protecting the rest of the crown reinforcement from external aggressions, in particular perforations. [5] In this type of tire, the crown reinforcement may also comprise other plies, for example so-called hooping plies comprising cables oriented substantially in the circumferential direction (also called zero degree plies), which they be radially external or internal with respect to the working plies. [6] Such a tire is subjected to numerous aggressions. Indeed, the rolling of this type of tire is usually done on a rough surface comprising indentors, for example stones sometimes having a size of the order of several tens of centimeters. [7] In the presence of indentors exerting too much stress on the crown reinforcement of the tire, the rupture of the cables of the working plies makes the tire unusable. [008] Until now, tire designers have attempted to remedy the problem of breaking the cables of the working plies by reinforcing them mechanically. [009] One solution consists in the use, within the working plies, of metal cables having high breaking forces, and in particular by the use of larger diameter metal cables. P10-3318_EN - 2 - [10] However, the use of working plies comprising larger diameter wire ropes causes, due to their large thickness, significant shear on the edges of the working plies, between these layers of plywood. work and adjacent gum masses. These shears are at the origin of cleavage pockets which lead to the separation of the working plies and adjacent masses of rubber. [11] In addition, the use of larger diameter wire ropes leads to an increase in the rigidity of the edges of the working plies which reduces the ability of each ply to conform to the rounded shape imposed by the blank on which each working ply is deposited during the manufacture of the tire. [12] The invention therefore aims to indirectly strengthen the working plies so as to make them more resistant to indentors. In other words, the object of the invention is to increase the mechanical strength of the working plies to the indentors by limiting the increase in the mechanical strength provided to these working plies. [13] For this purpose, the subject of the invention is a tire comprising a tread and a crown reinforcement arranged radially inside the tread, the crown reinforcement comprising: a protective reinforcement comprising at least one protection ply having a breaking force FMNSP; and a working reinforcement comprising at least one working ply having a breaking force FmNST, the working reinforcement being arranged radially inside the protective reinforcement; and wherein the ratio FmNsp / FmNsT is greater than or equal to 0.27. [014] The inventors at the origin of the invention discovered that the working plies were not significantly more resistant to the stresses exerted by the indentors even if they were more robust. Thus, the inventors have discovered that the mechanical reinforcement of the protective reinforcement with respect to the working plies indirectly makes it possible to improve the resistance of the working plies to the stresses exerted by the indentors on the tire, in contrast to the direct reinforcement of the struts. tablecloths. [015] Advantageously, the ratio FmNsp / FmNsT is greater than or equal to 0.30, preferably 0.35, more preferably 0.41 and even more preferentially at 0.50. [016] Advantageously, the ratio FmNsp / FmNsT is less than or equal to 0.90, preferably 0.70. P10-3318_EN - 3 - [017] In a preferred embodiment of the invention, each protection ply has a breaking force FmNSP greater than or equal to 1300 daN.cm-1, preferably 1400 daN.cm-1 more preferably at 1500 daN.cm-1 and even more preferably at 1600 daN.cm-1. [018] Such breaking forces of the protective plies can be obtained by varying many parameters. [19] In one embodiment, each protection ply comprising reinforcement elements, referred to as protection elements, each protective reinforcement element has a breaking force greater than or equal to 3000 N, preferably 3500 N, more preferably greater than 3500 N, more preferably 4500 N and even more preferentially at 5500 N. One of the parameters mentioned above is the unit breaking force of each reinforcing element or cable. [20] In another embodiment, each protection ply comprising reinforcement elements, called protection elements, the laying pitch of the protective reinforcing elements ranges from 1.2 to 6.5 mm, preferably from 2 to 5 to 5.0 mm, and more preferably 3.5 to 4.5 mm. Another of the parameters mentioned above is the laying step. The shorter it is, the higher the density of reinforcement elements and the value of breaking force of the web is high. However, a too high density of reinforcing elements penalizes the weight of the tire. Conversely, a too low density of reinforcing elements allows the penetration of solid bodies and the passage of these bodies between two adjacent reinforcing elements. [21] The reinforcing elements of the protective and working plies are, in the same ply, arranged side by side parallel to each other in a main direction substantially perpendicular to the general direction according to which these reinforcing elements are extend. The pitch is the distance, in the main direction, separating two similar points from two adjacent reinforcing elements, i.e., the axis-to-axis distance between two adjacent reinforcing elements. [22] In one embodiment, each working ply has a breaking force FmNST greater than or equal to 2000 daN.cm-1, preferably 2500 daN.cm-1, more preferably 3000 daN.cm-1 and even more preferably at 4000 daN.cm-1. [23] In one embodiment, each working ply comprising reinforcing elements, called working elements, each working reinforcing element has a breaking force greater than or equal to 15000 N, preferably 20000 N, more preferably to 25000 N. [24] In another embodiment, each working ply comprising reinforcing elements, called working elements, the laying pitch of the reinforcing elements P10-3318_EN - 4 - ranges from 2.5 to 7 , 5 mm, preferably from 3.0 to 7.0 mm, and more preferably from 3.5 to 6.5 mm. [025] In one embodiment, the protective armature is interposed radially between the tread and the armature work. [026] According to an optional characteristic of the tire, each protection ply comprising reinforcing elements, called protection elements, the protective reinforcing elements make an angle of at least 10 °, preferably ranging from 10 ° to 35 ° and more preferably from 15 ° to 35 ° with the circumferential direction of the tire. [027] According to another optional feature of the tire, each working ply comprising reinforcement elements, said working, the reinforcing elements work at an angle at most equal to 60 °, preferably from 15 ° to 40 ° with the circumferential direction of the tire. [28] In a preferred embodiment, the crown reinforcement comprises a hooping reinforcement comprising at least one hooping web. [29] Advantageously, each hooping sheet comprising reinforcing elements, said hooping elements, hooping reinforcing elements make an angle at most equal to 10 °, preferably ranging from 5 ° to 10 ° with the circumferential direction of the tire . [030] In one embodiment, the hooping frame is arranged radially inside the working frame. Advantageously, the tire comprises a top surmounted by the tread, two sidewalls, two beads, each side connecting each bead at the top, a carcass reinforcement anchored in each of the beads and extending in the sidewalls into the top. [031] In a preferred embodiment, the carcass reinforcement is arranged radially inside the crown reinforcement. [32] Advantageously, the carcass reinforcement comprises at least one carcass ply comprising carcass reinforcing elements, the carcass reinforcing elements forming an angle greater than or equal to 65 °, preferably to 80 ° and more. preferably ranging from 80 ° to 90 ° with respect to the circumferential direction of the tire. [33] In a preferred embodiment, the tire has a WRU-type dimension in which lik35, preferably Uk49 and more preferably Uk57.In a preferred embodiment, the protective reinforcement comprises a plurality of protection plies, at least one of them, and even more preferably each of them, has a breaking force FMNsp such that the ratio FmNsp / FmNsT is greater than or equal to 0.27. P10-3318_EN - 5 - [034] In another preferred embodiment, the reinforcement comprises several working plies, at least one of which, and even more preferably each, has a breaking force FmNST such that the ratio FmNsp / FmNsT is greater than or equal to 0.27. [035] In another even more preferred embodiment, the protective armor comprising a plurality of protective plies, the working armor comprising a plurality of working plies, at least one protective ply, and more preferably each of them, has a breaking force FmNsp and at least one working ply, and more preferably each of them, has a breaking force FmNST such that the ratio FmNsp / FmNsT is greater than or equal to 0.27. [36] Preferably, each protective and / or working reinforcement element is a wire element. Wire element means any elongate element of great length relative to its cross section, whatever the shape of the latter, for example circular, oblong, rectangular or square, or even flat, this wire element can be rectilinear as non-rectilinear , for example twisted, or corrugated. [37] Preferably, the protective and / or working reinforcement elements are metallic. By metal, is meant by definition a reinforcing element consisting, in mass, predominantly (that is to say for more than 50% of these son) or integrally (for 100% son) of a metallic material, by example of steel. [38] Even more preferentially, the protective and / or working reinforcing elements are metal cables comprising several single metal wires. By metallic unit wire, is meant by definition a monofilament consisting predominantly (that is to say for more than 50% of its mass) or integrally (for 100% of its mass) of a metallic material. Each monofilament is preferably made of steel, more preferably of pearlitic (or ferritoperlitic) carbon steel, hereinafter referred to as "carbon steel", or else of stainless steel (by definition, steel comprising at least 11% chromium and at least 50 % of iron). [039] When carbon steel is used, its carbon content (% by weight of steel) is preferably between 0.5% and 0.9%. It is preferable to use a steel cord type steel with normal resistance (called "NT" for "Normal Tensile"), high resistance (called "HT" for "High Tensile") or very high resistance (called SHT for "Super" High Tensile) whose tensile strength (Rm) is preferably greater than 2500 MPa, more preferably greater than 3000 MPa and even more preferably 3500 MPa (measured in traction according to the ISO 6892-1 standard of 2009. P10-3318_EN - 6 - [40] In a preferred embodiment, each metallic unitary wire has a diameter ranging from 0.10 mm to 0.35 mm. [41] With regard to the reinforcing elements, the fracture force measurements noted by Fr ( maximum load in N) are carried out in traction according to the standard ISO 6892-1 of October 2009 on reinforcing elements extracted from tires, preferably substantially new, comprising the rubber of the tire. the strength to rupture of the sheet, noted Fm, is obtained by dividing the breaking force Fr by the laying pitch. [42] In the present application, any range of values referred to as "between a and b" represents the range of values from more than a to less than b (i.e., excluding terminals a and b). ) while any range of values designated by the expression "from a to b" means the range of values from the terminal "a" to the terminal "b" that is to say including the strict limits " a "and" b ". [043] The invention will be better understood on reading the description which follows, given solely by way of nonlimiting example and with reference to the drawings in which: FIG. 1 is a simplified sectional view of FIG. a tire according to the invention; FIG. 2 is a detailed view of part I of the tire of FIG. 1. [44] EXAMPLE OF TIRES ACCORDING TO INVENTION [45] In the following description, in the use of the term "radial", it is It is appropriate to distinguish several different uses of the word by the person skilled in the art. First, the term refers to a radius of the tire. It is in this sense that a point, a ply or a reinforcement P1 is said to be "radially inner" at a point, a ply or a reinforcement P2 (or "Radially inward" of point P2) if it is closer to the axis of rotation of the tire than the point, the ply or the reinforcement P2. Conversely, a point, a ply or a reinforcement P3 is said to be "radially external to" a point, a ply or an armature P4 (or "radially outside" the point, of a ply or of a P4 reinforcement ) if it is farther from the axis of rotation of the tire than the point, the ply or the armature P4. We will say that we are advancing "radially inwards (or outwards)" as we move towards smaller (or larger) radii. When it comes to radial distances, this sense of the term also applies. [046] On the other hand, a reinforcing element or a reinforcement is said to be "radial" when the reinforcing element or reinforcing elements of the reinforcement make with the circumferential direction an angle greater than or equal to 65 ° and lower or equal to 90 °. P10-3318_EN - 7 - [47] An "axial" direction is a direction parallel to the axis of rotation of the tire. A point, a ply or a reinforcement P5 is said to be "axially interior" at a point, a ply or a reinforcement P6 (or "axially inside" the point, the ply or the reinforcement P6) if is closer to the median plane M of the tire than the point, the ply or the armature P6. Conversely, a point, a ply or an armature P7 is said to be "axially outside" at a point P8 (or "axially outside" of the point, the ply or the armature P8) if it is farther from the median plane M of the tire as the point, the ply or the armature P8.The "median plane" M of the tire is the plane which is normal to the axis of rotation of the tire and which is equidistant from the annular reinforcement structures each bead. [48] A "circumferential" direction is a direction that is perpendicular to both a tire radius and the axial direction. [49] In the figures, there is shown a reference X, Y, Z respectively corresponding to the usual axial, radial and circumferential orientations of a tire. [50] FIGS. 1 and 2 show a vehicle tire of the civil engineering type, for example of the "dumper" type, and designated by the general reference 10. Thus, the tire 10 has a WRU-type dimension, for example example 40.00 R 57 or 59/80 R 63. [051] In a manner known to those skilled in the art, W, denotes: when it is in the H / B form, the nominal aspect ratio H / B as defined by ETRTO (where H is the height of the tire section and B is the width of the tire section) - when it is in the form of H.00 or B.00, where H = B, H and B being as defined above. U represents the diameter, in inches, of the seat of the rim on which the tire is intended to be mounted, R denotes the type of carcass reinforcement of the tire, here radial. We have lik35, preferably Uk49 and more preferably lik57. [052] The tire 10 has a vertex 12 reinforced by a crown reinforcement 14, two sidewalls 16 and two beads 18, each of these beads 18 being reinforced with a rod 20. The top 12 is surmounted by a tread 22 The crown reinforcement 14 is arranged radially inside the tread 22. A carcass reinforcement 24, arranged radially inside the crown reinforcement 14, is anchored in each bead 18, here rolled up. around each rod 20 and comprises an upturn 26 disposed towards the outside of the tire 10 which is shown here mounted on a rim 28. P10-3318_EN - 8 - [53] The carcass reinforcement 24 comprises at least one carcass ply 30 comprising reinforcement elements, said carcass (not shown). The carcass reinforcement elements make an angle greater than or equal to 65 °, preferably 80 ° and more preferably 80 ° to 90 ° with respect to the circumferential direction of the tire. The carcass reinforcement elements are arranged substantially parallel to each other and extend from one bead 18 to the other. Examples of such carcass reinforcement elements are described in documents EP0602733 or else EP0383716. [54] The tire 10 also comprises a sealing ply 32 made of an elastomer (commonly called "inner liner") which defines the radially inner face 34 of the tire 10 and which is intended to protect the carcass ply 30 of the tire. air diffusion from the interior space to the tire 10. [55] The crown reinforcement 14 comprises, radially from the outside to the inside of the tire 10, a protective reinforcement 36 arranged radially inside the tire. the tread 22, a working armature 38 arranged radially inside the protective armature 36 and a shrinking armature 39 arranged radially inside the armature 38. Thus, the armature protection 36 is interposed radially between the tread 22 and the working armature 38. [056] The protective armature 36 comprises first and second protective plies 42, 44, the first protection ply 42 being radially inside the second protection ply 44. [57] The working reinforcement 38 comprises first and second working plies 46, 48, the first working ply 46 being arranged radially inside the ply. second working ply 48. [58] The hooping reinforcement 39, also called limiter block, whose function is to partially recover the mechanical stresses of inflation, comprises first and second hooping plies 40, 41, the first ply shrink 40 being arranged radially inside the second hooping ply 41. [59] PROTECTIVE FRAME [001] The first and second protective plies 42, 44 comprise reinforcing elements, called protective elements (not shown) . Here, the reinforcing elements of each first and second protective ply 42, 44 are identical. In this case, each protective reinforcement element of the protective armature 36 comprises a metal cable. The protective reinforcement elements are arranged side by side parallel to each other in a main direction P10-3318_EN - 9 - substantially perpendicular to the general direction in which these reinforcing elements extend. The protective reinforcement elements are crossed from one protective layer 42, 44 to the other. [60] Each protective reinforcement element, here the general direction in which these reinforcing elements extend, makes an angle at least equal to 10 °, preferably ranging from 10 ° to 35 ° and more preferably from 15 ° to 35 ° with the circumferential direction Z of the tire 10. Here, the angle is equal to 24 °. [61] Here, each protective reinforcement element is a metal cable of the type 52.26 for example as described in the document FR 2 959 517. This cable has a structure K x (M + P), with here K = 4, M = 4 and P = 9, comprising a single layer consisting of K strands, each strand comprising: - an inner layer of the strand consisting of M internal thread (s), and - an outer layer of the strand consisting of N strands helically wrapped around the inner layer of the strand.
    [0002] Each unit metal wire has a diameter ranging from 0.10 mm to 0.35 mm and here equal to 0.26 mm. [62] Each protective reinforcement element has a fracture force Fr greater than or equal to 3000 N, preferably 3500 N, more preferably 4500 N and more preferably greater than or equal to 5500 N. Here, the breaking force of the cable 52.26 is equal to 6038 N. [63] The laying pitch of the protective reinforcing elements of each protective ply 42, 44 is from 1.2 to 6.5 mm, preferably from 2.5 to 5.0 mm, and more preferably from 3.5 to 4.5 mm and is here equal to 3.7 mm. [64] Each protective ply 42, 44 has respectively a breaking force FmNSP1, FmNSP2 greater than or equal to 1300 daN.cm-1, preferably 1400 daN.cm-1, more preferably 1500 daN.cm-1 and even more preferably at 1600 daN.cm-1 and here FMNSP1 = FMNSP2 = FMNsp = 1632 daN.cm-1. [65] WORKING FRAME [066] The first and second working plies 46, 48 comprise reinforcing elements, known as working elements (not shown). Here, the reinforcing elements of each first and second working ply 46, 44 are identical. In this case, each work reinforcement element of the work frame 38 comprises a metal cable. The reinforcing elements are arranged side by side parallel to each other in a main direction substantially perpendicular to the general direction in which these reinforcing elements extend. The reinforcing elements of work are crossed from one working ply 46, 48 to the other. P10-3318 EN -10- [67] Each work reinforcement element, here the general direction in which these reinforcing elements extend, is at an angle of not more than 60 °, preferably ranging from 15 ° to 40 °. with the circumferential direction Z of the tire 10. Here, the angle of the reinforcing elements of the first working ply is equal to 19 ° and the angle of the reinforcement elements of the second working ply is equal to 33 °. [68] Here, each work reinforcement element is a type 84.26 wire rope. This cable has a structure (J + Q) x (A + B) with J = 1, Q = 6, A = 3 and B = 9, and comprises: - an inner layer of the cable constituted by J internal strand (s) (S), - an outer layer of the cable consisting of Q outer strands wound helically around the inner layer of the cable, each inner and outer strand comprising: - an inner layer of the strand consisting of A wire (s) internal (s) an outer layer of the strand consisting of B external wires wound helically around the inner layer of the strand. Each unit metal wire has a diameter ranging from 0.10 mm to 0.35 mm and here equal to 0.26 mm. [069] Each work reinforcing element 84.26 has a breaking force Fr equal to 12251 N. [070] The laying pitch of the working reinforcing elements of each working ply 46, 48 is from 2.5 to 7, 5 mm, preferably 3.0 to 7.0 mm, and more preferably 3.5 to 6.5 mm and is here equal to 3.8 mm. [71] Each working ply 46, 48 has respectively a breaking force FmNST1, FmNST2 greater than or equal to 2000 daN.cm-1, preferably 2500 daN.cm-1, more preferably 3000 daN.cm-1 and here FMNST1 = FMNST2 = FmNST = 3224 daN.cm-1. In other embodiments using other cables or a smaller laying pitch, the breaking force FmNST is greater than or equal to 4000 daN.cm-1. [72] In another embodiment, each working cable is of the type 189.23 and is of structure (J + Q) x (A + C + B) with J = 1, Q = 6, A = 3, C = 9 and B = 15 and comprises: - an inner layer of the cable consisting of J inner strand (s), - an outer layer of the cable consisting of Q outer strands wound helically around the inner layer of the cable, each strand internal and external comprising: - an inner layer of the strand consisting of A wire (s) internal (s), - an intermediate layer of the strand consisting of C intermediate son helically wound around the inner layer of the strand, - an outer layer of strand consisting of B external wires helically wound P10-3318_EN around the intermediate layer of the strand. There is then a breaking force greater than or equal to 15000 N, preferably 20000 N, more preferably 25000 N. [073] FRAME REINFORCEMENT [74] Each hoop 40, 41 comprises reinforcing metal reinforcing elements (Not shown), for example metal cables as described in FR 2 419 181 or FR 2 419 182 and having an angle at most equal to 10 °, preferably ranging from 5 ° to 10 ° with the circumferential direction Z of the tire 10. Here the angle is equal to 8 °. The hoop reinforcing elements are crossed from one hooping web 40, 41 to the other. [75] EXAMPLE OF PROCESS FOR MANUFACTURING PNEUMATIC CABLE ACCORDING TO INVENTION [076] Metal cables are manufactured by wiring or by twisting, according to conventional methods known to those skilled in the art. [77] COMPARATIVE TESTS [78] A tire of the state of the art T and several tires P1 to P5 according to the invention were compared below. All the tires P1 to P5 comprise two protective plies comprising identical protective reinforcement elements from one protective ply to the other and two working plies comprising identical working elements from one working ply to the other. . The tire P1 is identical to the tire 10 described above. The tires P2 to P5 correspond to embodiments in which only the laying steps of the protective and / or working reinforcing elements have been varied in order to vary the values of Fm -Nspi = FmNsp2 = FmNsp and FmNST1 = FmNST2 = FmNST- For each tire Pi, the relative percentage N of variation of FmNST equal to 100 is given. (FmNST (Pi) - FmNST (T)) / FmNST (T). [079] Each tire was tested in a breaking test of the working plies in which the tire was passed over an indenter having a hemispherical head several centimeters in diameter. At each pass, the indenter is raised by 5 mm until one of the working plies breaks. The higher the height at which one of the working plies breaks is important (maximum height Hm), the more the tire is resistant against the action of the indenter. The maximum heights Hm measured were brought back to the maximum height Ho measured for the tire T. The given percentage R is equal to the value 100. (Hm-Ho /) Ho. The characteristics of the different T and P1 to P5 tires were collected together with the results of the failure tests in Table 1 below. FmNSP FmNST FmNsp / FmNsT N (%) R (%) (daN.cm-1) (daN.cm-1) T 616 2406 0.26 0 0 P1 1632 3224 0.51 34 39 P2 1016 2574 0.39 7 19 P3 850 2406 0.35 0 15 P4 1016 2189 0.46 -9 12 P5 1016 1660 0.61 -31 -1 Table 1 [081] Note that the tires P1 to P5 according to the invention are all such that FmNsp / FmNsT k 0.27 and even such that FmNsp / FmNsT k 0.30 or even such that FmNsp / FmNsT k 0.35, even such that FmNsp / FmNsT k 0.41, or even such as FmNsp / FmNsT k 0, 50. In addition, the tires P1 to P5 according to the invention are all such that FmNsp / FmNsT 0.90 or such as FmNsp / FmNsT 0.70. [082] The results of the P1 tire failure tests show that, for a relatively large increase in the value of FmNST (34%), a relatively large increase in the maximum height is also obtained by increasing the value of FmNSP so that FmNSP / FmNST 0.27. [83] In addition, the results of the P2 and P3 tire failure tests show that, for a relatively small increase or even a maintenance of the value of FmNST (7% and 0%), a significant increase in the maximum height is obtained. (19% and 15%) by increasing the value of FmNSP so that FmNSP / FmNST 0.27. [84] In addition, the results of the P4 tire failure tests show that, for a moderate decrease in the FmNST value (-9%), a significant increase in the maximum height (12%) is obtained by increasing the value of FmNSP so that FmNSP / FmNST 0.27. [85] Finally, the results of the P5 tire failure tests show that, for a relatively large decrease in the value of FmNST (-31%), the maximum height is practically not impacted (-1%) by increasing the value of FmNSP so that FmNSP / FmNST 0.27. [86] The comparison of the results of the failure tests between the T and P3 tires shows that, for a fixed value of FmNST, the increase of the FmNSP / FmNST ratio allows a maximum height gain of 15%. The comparison of the results P10-3318_EN -13- with the tests of rupture between the tires T and P4 shows that, for a fall of the value of FmNST, the increase of the ratio FmNsp / FmNsT, allows anyway a maximum height gain of 12%. [87] Thus, in conclusion, a tire according to the invention having a ratio FmNSP / FmNST greater than or equal to 0.27 makes it possible to increase the mechanical resistance to the indentors of the working plies by limiting the increase, or even by maintaining and same and decreasing the mechanical strength of these working plies. [88] The invention is not limited to the previously described embodiments. [89] Indeed, in the context of the invention, it will be possible to envisage a protective reinforcement comprising a plurality of protective plies, only one of which has a breaking force FmNSP such that the ratio FmNsp / FmNsT is greater than or equal to 0.27. [90] Still within the scope of the invention, it will be possible to envisage a working reinforcement comprising several working plies of which only one of them has a breaking force FmNST such that the ratio FmNsp / FmNsT is greater than or equal to at 0.27. [91] Still within the scope of the invention, it is possible to envisage a tire comprising: a protective reinforcement comprising a plurality of protective plies, at least two of which have different breaking forces, for example thanks to different reinforcing elements, and a working reinforcement comprising a plurality of working plies, at least two of which have different breaking forces, for example thanks to different reinforcing elements, at least one protective ply has a breaking force FmNsp and at least one ply of Work has a breaking force FmNST such that the ratio FmNsp / FmNsT is greater than or equal to 0.27. P10-3318_FR
    权利要求:
    Claims (16)
    [0001]
    REVENDICATIONS1. Pneumatic tire (10) for a civil engineering vehicle, characterized in that it comprises a tread (22) and a crown reinforcement (14) arranged radially inside the tread (22), the reinforcement vertex (14) comprising: - a protective armature (36) comprising at least one protective ply (42, 44) having a breaking force FMNSP; and a working armature (38) comprising at least one working ply (46, 48) having a breaking force FmNST, the working armature (38) being arranged radially inside the protective armature ( 36); and wherein the ratio FmNsp / FmNsT is greater than or equal to 0.27.
    [0002]
    2. A tire (10) according to the preceding claim, wherein the ratio FmNsp / FmNsT is greater than or equal to 0.30, preferably 0.35, more preferably 0.41 and more preferably 0.50.
    [0003]
    3. A tire (10) according to any one of the preceding claims, wherein the ratio FmNsp / FmNsT is less than or equal to 0.90, preferably 0.70.
    [0004]
    4. A tire (10) according to any preceding claim, wherein each protective ply (42, 44) has a breaking force FmNSP greater than or equal to 1300 daN.cm-1, preferably 1400 daN.cm -1, more preferably at 1500 daN.cm-1 and even more preferably at 1600 daN.cm-
    [0005]
    5. A tire (10) according to any preceding claim, wherein, each protective ply (42, 44) comprising reinforcing elements, said protection, each protective reinforcement element has a breaking force (Fr. ) greater than or equal to 3000 N, preferably 3500 N, more preferably 4500 N and even more preferentially 5500 N.
    [0006]
    6. A tire (10) according to any preceding claim, wherein, each protective ply (42, 44) comprising reinforcing elements, said protection, the laying step of the protective reinforcement elements is 1 , 2 to 6.5 mm, preferably 2.5 to 5.0 mm, and more preferably 3.5 to 4.5 MM.
    [0007]
    7. A tire (10) according to any one of the preceding claims, wherein each working ply (46, 48) has a breaking force FmNST greater than or equal to 2000 daN.cm-1, preferably 2500 daN.cm -1, more preferably at 3000 daN.cm-1 and even more preferably at 4000 daN.cm- P10-3318_FR-15-
    [0008]
    8. A tire (10) according to any preceding claim, wherein, each working ply (46, 48) comprising reinforcing elements, said working, each work reinforcement element has a breaking force (Fr. ) greater than or equal to 15000 N, preferably 20000 N, more preferably 25000 N.
    [0009]
    9. A tire (10) according to any one of the preceding claims, wherein, each working ply (46, 48) comprising reinforcing elements, said working, the laying step of the reinforcing elements of work goes from 2 , 5 to 7.5 mm, preferably 3.0 to 7.0 mm, and more preferably 3.5 to 6.5 mm.
    [0010]
    10. A tire (10) according to any one of the preceding claims, wherein the protective armature (36) is interposed radially between the tread (22) and the armature (38).
    [0011]
    11. A tire (10) according to any one of the preceding claims, wherein, each protective ply comprising reinforcing elements, said protective, the protective reinforcing elements are at an angle at least equal to 10 °, preferably ranging from 10 ° to 35 ° and more preferably from 15 ° to 35 ° with the circumferential direction of the tire (10).
    [0012]
    12. A tire (10) according to any one of the preceding claims, wherein, each working ply (46, 48) comprising reinforcing elements, said working, the reinforcing elements work at an angle at most equal to 60 °, preferably from 15 ° to 40 ° with the circumferential direction of the tire (10).
    [0013]
    A tire (10) according to any one of the preceding claims, wherein the crown reinforcement (14) comprises a hooping reinforcement (39) comprising at least one hooping web (40, 41).
    [0014]
    14. Tire (10) according to the preceding claim, wherein each shrink web (40, 41) comprising reinforcement elements, said shrinking, the hooping reinforcing elements are at an angle at most equal to 10 °, preferably ranging from 5 ° to 10 ° with the circumferential direction of the tire (10).
    [0015]
    15. A tire (10) according to claim 13 or 14, wherein the hooping frame (40) is arranged radially inside the working frame (38).
    [0016]
    16. Pneumatic tire (10) according to any one of the preceding claims, having a dimension of type W R U with lik35, preferably Uk49 and more preferably lik57. P10-3318_FR
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    同族专利:
    公开号 | 公开日
    CN106232380A|2016-12-14|
    JP2017513767A|2017-06-01|
    EP3134280A1|2017-03-01|
    AU2015250907A1|2016-11-24|
    EP3134280B1|2018-04-04|
    WO2015162176A1|2015-10-29|
    CN106232380B|2017-12-08|
    BR112016024320A2|2018-05-15|
    AU2015250907B2|2017-08-10|
    US10933694B2|2021-03-02|
    US20170203613A1|2017-07-20|
    FR3020017B1|2017-06-09|
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    WO2019058053A1|2017-09-22|2019-03-28|Compagnie Generale Des Etablissements Michelin|Crown reinforcement for a tyre for a heavy vehicle of construction plant type|
    法律状态:
    2016-04-21| PLFP| Fee payment|Year of fee payment: 3 |
    2017-04-19| PLFP| Fee payment|Year of fee payment: 4 |
    2018-04-20| PLFP| Fee payment|Year of fee payment: 5 |
    2020-01-10| ST| Notification of lapse|Effective date: 20191205 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1453593A|FR3020017B1|2014-04-22|2014-04-22|PNEUMATIC VEHICLE FOR CIVIL ENGINEERING|FR1453593A| FR3020017B1|2014-04-22|2014-04-22|PNEUMATIC VEHICLE FOR CIVIL ENGINEERING|
    BR112016024320A| BR112016024320A2|2014-04-22|2015-04-22|civil engineering vehicle tire|
    PCT/EP2015/058714| WO2015162176A1|2014-04-22|2015-04-22|Tyre for vehicle of construction plant type|
    JP2016564130A| JP2017513767A|2014-04-22|2015-04-22|Construction plant type vehicle tires|
    CN201580021188.0A| CN106232380B|2014-04-22|2015-04-22|Tire for the vehicle of construction site type|
    EP15717185.1A| EP3134280B1|2014-04-22|2015-04-22|Tyre for vehicle of construction plant type|
    AU2015250907A| AU2015250907B2|2014-04-22|2015-04-22|Tyre for vehicle of construction plant type|
    US15/304,976| US10933694B2|2014-04-22|2015-04-22|Tire for vehicle of construction plant type|
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