MXPA99008024A - Tires with high resistance reinforcement in the carc - Google Patents

Abstract

A strip of rim layer material is reinforced with steel cords where the steel cords are constructed of high strength wire filament that has at least a tensile strength of -2000 x D 1 4400 MPa, where D is the diameter of the filament in mm. The tires are built with the layer material in the frame

Description

TIRES WITH HIGH RESISTANCE REINFORCEMENT IN THE HOUSING The present invention refers to ropes, layers reinforced with ropes and radial tires for vehicles. Radial rims are rims where the cords of the carcass plies, which extend from one flange to the other, are substantially in radial planes. More particularly, the present invention relates to a structure of one or more layers formed of a rubber-reinforced cord-reinforced composite where the structure is preferably for tires such as, for example, rim housing where at least one of the layers in the The casing has the strings inclined in relation to the direction of rotation of the rim. Reinforced elastomeric articles are well known in the art. For example, conveyor belts or the like, tires, etc., are constructed with textile cords and / or filaments or fine steel wire strands. Particularly, the bands used in pneumatic tires are constructed with up to 8 layers with the rope reinforcement of adjacent layers inclined relative to the direction of movement of the rim when it is desirable to reinforce both in the lateral direction and in the direction of rotation of the tire. tire. In addition, cords made of strands of twisted filaments of fine wire with a single-strand construction having two or more filaments and a wrapping filament for reinforcing the rope structure are also known. In some cases, the reinforcement includes the use of single strand strands of multiple strands that are not twisted together but twisted together as a group or set (multiple strand) to simplify the construction of the rope, in accordance with what is presented in Patent number 4,947,636 of the beneficiaries that is incorporated by reference in its entirety here. Higher resistance to fatigue requirements for compounds in tires resulted in rope with smaller filament diameter that required a greater number of filaments in the rope to obtain the necessary strength. Two-ply tire rims for passenger cars and light trucks can have 2x.255ST and 2 + 2x.32- cords. 0ST, respectively. An example of the first construction is described in registration number H1333 of the statutory invention of the beneficiary, issued on July 5, 1994, the application of which is incorporated by reference in its entirety here, where multiple filament ropes such as 2X.255ST they present themselves This designation refers to a rope of two (2) filaments with a diameter of 0.255 mm. An example of the rope of 2 + 2x.32-.40ST is presented in the US patent number 5,242,001 of the beneficiary that is incorporated in its entirety by reference herein. This designation refers to a cord of four (4) filaments of 0.32-.40 mm in diameter (with two (2) filaments twisted in a length of twist less than the other two (2) filaments). Multiple filament ropes such as 2 + 2x.32-.40ST are needed to meet the higher strength requirement for tire tread compounds, which are typically used in light truck applications. Rope ropes are made of super tensile steel (ST) in accordance with what is defined below. Rough rope designs incorporating super tensile steel (ST) are effective, there is a continuing need to develop lighter rope constructions with improved features, such as higher resistance to corrosion propagation and better tire performance, in comparison with recent constructions highly resistant to tension and super resistant to tension. The rope constructions described generally have not found use in larger tires such as for off road tires (OTR) because they were not strong enough. Even with the arrival of the filament with high tensile strength, such as the beneficiary's 2 + 2x rope, presented for use in rims for passenger vehicles and light trucks, large OTR tires continue to use additional constructions such as 7x7x. 25 + lHT and 3x7x.22HE comprising 7 strands of each of 7 filaments of high tensile strength of a diameter of .25 mm which are twisted together and wrapped in spiral; and 3 strands each of 7 filaments of high tensile strength of a diameter of .22 mm twisted together, respectively. The steel rope rope currently used to reinforce the layers in the OTR rims for sizes 36 .00R51 and greater is a rope with strands of high tensile strength rim cord filaments such as 7xl9x.20 + lHT comprising 7 strands each of 19 filaments of high tensile strength of a diameter of .20 mm twisted together and wrapped spirally. These strings were made of steel of high tensile strength (HD) in accordance with what is defined below. More recently, OTR rims can be constructed of multilayer or single layer bands with reinforcing cords, such as 27x265ST or 5 + 8 + 14,265ST + 1 as presented in patent number 5,318,643 of the beneficiary, said patent it is incorporated herein by reference in its entirety. In addition, current steel rope constructions have load breaking and wire gauge numberings that prevent achieving the required design of resistance per inch for tires larger than 40.00R57 used in trucks and soil removal equipment weighing up to 320 tons and sometimes plus. There is a need to increase the area of open space between the ropes in the layer and band, that is, the space between the ropes, in the case of tire sizes of 36.00R51 and more so that more rubber can penetrate between the ropes during the manufacture of tires to increase the quality of the calender treatment avoiding what is known as "open space between the weak ropes" or "loose cover" (which can result in air trapped in the tires). Many problems have had to be overcome even after the development of higher strength filaments and cords mentioned above. Higher strength steel alloys resulted in changes in the rope modulus that provided the possibility of adjusting the parameters of a gross tire band load that depends on 3 factors considering adequate adhesion between the rope and the rubber. The factors are string modulus, the ratio between string volume and rubber volume (which is frequently expressed between the number of string tips per inch (epi)), and the string reinforcement angle. In addition, as the cord reinforcement angle approaches the direction of rotation of the rim, the support of the reinforcement in the lateral direction moves towards zero. An increase in the two other factors related to the aforementioned rope, that is, the string modulus and the ratio between the cord volume and the rubber volume, generally results in an increase in the weight of the band. The added weight can mean a higher cost, a higher resistance to rotation and a lower fuel economy of a tire. Simply using lighter strings with a smaller modulus does not solve the problem because, even though they have a lower weight, the minor string modulus must be compensated for by an increase in the ratio between string volume and rubber volume. This increase in the volume of the rope is limited by the physical size of the rope and the resulting spacing between the cords that govern the amount of open space between the cords, that is, the ability of the rubber to penetrate between the cords for a good adherence between rope and rubber. It is an object of the present invention to determine rope structures that would take advantage of a new rope module while not negatively affecting the ratio between rope volume and rubber volume in lateral reinforcement in order to solve the problems and limitations of the tires. of the prior art and rope constructions of the prior art. It is another object of the present invention to offer rope structures that employ an ultra tensile resistant wire that results in lighter weight tires. It is another object of the present invention to offer rope structures employing ultra-tension resistant wires which results in rims with a greater resistance to the propagation of corrosion and a greater open space between the cords which causes better performance of the rope. tire. COMPENDIUM OF THE INVENTION The present invention relates to pneumatic tires with a housing having parallel cords where each cord comprises rope for multiple activities with a diameter (D) within a range of 0.07 to 0.45 mm and each filament has at least one resistance at the voltage of -2000 x D + 4400 MPa where D is the filament diameter. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 illustrates the cross section of a first embodiment of a rim in accordance with the present invention; Figure 2 illustrates a section in partial section of a second embodiment of a rim in accordance with the present invention; Figure 3 shows the section of cross section through a rope in accordance with an embodiment of the present invention; Figure 4 is a schematic cross-sectional illustration of a compound, such as two supported layers, in accordance with the present invention; and Figures 5 to 16 show cross sections through a rope in accordance with different embodiments of the present invention. DETAILED DESCRIPTION OF THE INVENTION A pneumatic rim with a casing having parallel strings, two lateral pairs spaced at a certain distance, which in the axial direction determines the overall width of the rim section, two rims from which they extend the tips of the cords of the casing, a floor placed on the crown of said casing, a band structure that can not extend circumferentially interposed between the floor and the casing, and at least one casing layer placed on said side walls between two rims and said crown of said casing, said band structure having a width substantially equal to the width of the floor and having an elastomeric fabric casing layer reinforced with metal cords, said metal cords in the casing layer being formed of several filaments having a diameter (D) that are located within a range of 0.07 to 0.45 mm, each filament has a tensile strength of -2000 x D + 4400 MPa where D is the diameter of the filament. After considerable studies, efforts, tests and time, the invention offers ropes and tire layers for passenger vehicles, light trucks, trucks, light trucks and OTRs that substantially reduce the size and sometimes the number of filaments for the load ranges covered. for this type of tire. While reducing the number of filaments causes an expected reduction in weight, this is not necessarily the case since the materials of the prior art require that the filament size be increased in order to obtain the strength required for the rim. However, with the use of ultra tensile-strength steel for rope constructions, the number and / or size of the filaments can be decreased while maintaining or reinforcing the rim. Other advantages that exist in the present invention include lighter rims, improved rolling resistance, greater resistance to the propagation of corrosion, and a reduction of the cord treatment gauge between the layers of rope in the housing. A reduction in weight due to a reinforcement weight reduction as well as a reduction in the amount of rubber gauge also results in a reduction in manufacturing costs and an improved fuel economy for the tires of the present invention. In addition, it is believed that an improved temperature transfer can be achieved with the new rope designs of the invention to extend the life and improve the operating performance of the tires that incorporate these cords. As used herein and in the claims: "Axial" and "Axially" are used herein to refer to lines or directions that are parallel to the axis of rotation of the rim. "Flange" refers to the part of the rim comprising an annular tension member wrapped by layer cords and formed with or without other reinforcing elements such as fins, tips, guards to suit the design of the tire ring. "Strip structure" refers to at least two layers of parallel strings, woven or non-woven, underlying the floor, not anchored on the rim, and having both left and right cord angles in the range of approximately 17 to approximately 70 degrees relative to the equatorial plane (EP) of the tire. "Carcase" refers to the structure of the tire apart from the band structure, the floor, the subfloor and the sidewall rubber on the layers, but includes the rims. "Rope" refers to one or more reinforcing elements, formed by two or more filaments / wires that may or may not be twisted or otherwise formed and that may also include strands that may or may not also be formed, of which consist the layers on the rim. "Crown" refers to the portion of the tire within the width limits of the tire floor. "Density" refers to the weight per unit length. "Equatorial plane (EP)" refers to the plane perpendicular to the axis of rotation of the rim and passing through the center of the tire floor. "Caliber" refers to the thickness of the material. "High tensile strength (HT) steel" refers to a carbon steel with a tensile strength of at least 3400 MPa for a filament diameter of 0.20 mm. "Super Stress Resistant Steel (ST)" refers to a carbon steel with a tensile strength of 3650 MPa for a filament diameter of 0.20 mm. "Ultra Stress Resistant Steel (UT)" refers to a carbon steel with a tensile strength (-2000 x D) +4400 MPa, where D is deviated all the filament in mm.

For example, of at least 4000 MPa for a filament diameter of 0.20 mm. "Load range" refers to load limits and inflation for a given tire used in a specific type of service as defined by the tables in The Tire and Rim Association Inc., 1989 Year Book. "Radial" and "radially" are used to refer to directions radially perpendicular to the axis of rotation through the rim. "Open space between the strings" refers to the open space between the strings in a layer. "Section width" refers to the linear distance parallel to the axis of the rim and between the outside of its side walls when and after inflation at normal pressure for 24 hours, but without load, excluding elevations of the sidewalls caused by marking , decoration or protective bands. "Stiffness ratio" refers to the value of the control band structure stiffness divided by the stiffness value of another band when the values are determined by a bending test of 3 fixed points having both ends of the rope supported and flexed by a load centered between the fixed ends. The ropes for use in the present invention may comprise several constructions with or without a spiral wrap. For example, representative constructions include 2x, 3x, 4x, 5x, 6x, 7x, 8x, llx, 12x, 27x, 1 + 2, 1 + 3, 1 + 4, 1 + 5, 1 + 6, 1 + 7 , 1 + 8, 1 + 14,1 + 15, 1 + 16, 1 + 17, 1 + 18, 1 + 19, 1 + 20, 1 + 26, 2 + 2, 2 + 5,2 + 6, 2 +7, 2 + 8, 2 + 9, 2 + 10, 2/2, 2/3, 2/4, 2/5, 2/6, 3 + 2, 3 + 3, 3 + 4, 3 + 6 , 3 + 8, 3 + 9, 3/9, 3 + 9 + 15, 4 + 9, 4 + 10, 4x4, 5/8/14, 7x2, 7x3, 7x4, 7x7, 7x12 and 7x19. Representative rope constructions with a spiral envelope include 2 + 2, 3 + 1, 5 + 1, ß + ß, 7 + 1, 8 + 1, 11 + 1, 12 + 1, 1 + 4 + 1, 1 + 5 +1, 1 + 6 + 1, 1/6 + 1, 1 + 7 / + 1, 1 + 8 + 1, 1 + 14 + 1, 1 + 15 + 1, 1 + 16 + 1, 1 + 17 + 1, 1 + 18 + 1, 1 + 19 + 1, 1 + 20 + 1, 1 + 26 + 1, 2 + 7 + 1, 2 + 8 + 1, 2 + 9 + 1, 2 + 10 + 1, 3 + 9 + 1, 3/9 + 1, 3 + 9 + 15 + 1, 7x2 + 1, 7x12 + 1, 7x19 + 1 and 27 + 1. The ropes listed above are especially suitable for use on pneumatic tires. The pneumatic rim can be a radial or inclined layer rim. When used in the carcass layer, the preferred strings are 2x, 3x, 4x, 5x, ßx, 8x, llx, 12x, 1 + 2, 1 + 3, 1 + 4, 1 + 5, 1 + 6, 1 +7, 1 + 8, 1 + 14, 1 + 15, 1 + 16, 1 + 17, 1 + 18, 1 + 19, 1 + 20, 2 + 1, 2 + 7, 2 + 8, 2 + 9 , 2 + 10, 2/2, 2/3, 2/4, 2/5, 2/6, 3 + 1, 3 + 2, 3 + 3, 3 + 4, 3 + 8, 3 + 9, 3 / 9, 3 + 9 + 15, 4 + 9, 4 + 10, 5/8/14, 7x12, 7x19, 5 + 1, 6 + 1, 7 + 1, 8 + 1, 11 + 1, 12 + 1 , 2 + 7 + 1, 1 + 4 + 1, 1 + 5 + 1, 1 + 6 + 1. 1 + 7 + 1, 1 + 8 + 1, 1 + 14 + 1, 1 + 8 + 1, 1 + 14 + 1, 1 + 15 + 1, 1 + 16 + 1, 1 + 17 + 1, 1+ 18 + 1, 1 + 19 + 1, 1 + 20 + 1, 3 + 9 + 1, 3/9/1, 7x12 + 1 and 7x19 + 1. The ropes for use in the present invention are preferably of a multi-layered construction. A multi-layer construction is a construction in which the diameter of the smallest circle surrounding the cross-section of the cord is at least equal to or greater than three times the diameter of the filaments. When a rope has a diameter of at least 3 times the diameter, the rope is considered as a two-layer rope. If the rope has a diameter of at least 5 times the diameter of the filament, then the rope is here as a three-layer rope. The ropes for use in the present invention may contain filaments of the same diameter or of different diameters. In accordance with one embodiment of the present invention, the number of internal or core filaments varies within a range of 2 to 4 and each filament has a diameter of has a diameter Di. The number of outer filaments or wrapping is equal to 2 to 4 and each filament has a diameter D2. According to this method, it is spaced between the parallel external filaments is equal to or greater than 0.2 mm in order to allow a good penetration of the rubber. The filaments that can be used to make the ropes of the present invention can have a diameter that ranges from 0.07 mm to 0.45 mm. For some applications, it is contemplated that the preferred diameter may be less than 0.1 mm or less than 0.2 mm. For example, a preferred diameter may be from 0.7mm to not more than 0. Imm or from 0.07mm to not more than 0.12mm. In other applications, the preferred diameter of the filament within a range of 0.14 to 0.43 mm is contemplated. A particularly preferred filament is located within a range of 0.15 to 0.38 mm. In addition, many of the novel cords written above result in lower linear density in the reinforcement for which they are used which results again in a lower weight and a lower cost for the reinforcement and its product, either the rim, the band or any other reinforced elastomeric. With reference to Figures 1 and 2 of the drawings, layers 12 and 14 are illustrated within an air tire 10 with a radial carcass where similar elements have similar reference numbers. For the purposes of the present invention, a rim has a radial shell structure when the ropes of the carcass reinforcement layer, or layers 12, 14 are angled in the range of 70 ° to 90 ° relative to each other. to the equatorial plane (EP) of the rim. In the case in which the metal blades of the present invention are used to reinforce the housing, only one of the two layers, if 2 are used, must be reinforced in this way. The other layer should be reinforced with another form of reinforcement. It is preferable that, if two shell layers are employed, the metal cord reinforcement layer is the bottom (inner) shell layer 14. Representative reinforcement examples that can be employed in the other non-reinforced metal shell layer are polyester rayon and nylon. The metal cord reinforced carcass ply 12 has a layer of steel cords 30 arranged such that they have from about 8 to about 20 inches per inch (EPI) when measured in a circumferential direction of the rim in a location that has a maximum tire width (MW). Preferably, the steel cords 30 are arranged such that they have from about 12 to about 16 spikes per inch (EPI) at the location having a maximum tire width MW. In terms of metric units, the steel cords are arranged such that they have approximately 8 tips per cm (EPC) when measured in a circumferential rim direction at a location having a maximum rim width. Preferably, the EPC is within a range of 4 to 7 EPI. The previous calculations for tips per inch are based on the range of diameters of the global strings, resistance of the filaments and ropes as well as the required strength requirement for the single shell layer. For example, the high number of tips per inch includes the use of a smaller diameter wire for versus a smaller number of tips per inch for a smaller diameter wire to obtain the same strength. In the alternative, if one chooses to use a monofilament of a given diameter, one may have to employ more or fewer tips per inch depending on the strength of the wire. The rim 10 has a pair of substantially inextensible annular flanges 16, 18 axially spaced therebetween. Each of the flanges 16, 18 is located on a rim portion of the rim 10 having external surfaces configured to be complementary to the rim seats and retaining flanges of a rim (not shown) on which the rim 10 is mounted. The layers 12, 14 may be of side-by-side reinforcement cords of polyester material or other material, or steel cords of the present invention and extend between the flanges 16, 18 with an axially external portion thereof. the structure of the casing folded around each of the flanges. While in the embodiment of figure 1 the layer structure of the carcass comprises two dandruffs 12, 14 of reinforcement material, it is understood that one or more carcass layers of any suitable material can be used in certain embodiments and one or more layers of reinforcement according to the present invention may also be employed. A layer of a low permeability material 20 may be placed inwardly of the carcass plies 12, 14, and contiguous with a chamber defined by the rim and rim assembly. The elastomeric side walls 22, 24 are positioned axially towards the outside of the shell structure. A circumferentially extending band structure 26 comprising in the illustrated embodiments two layers of the bands 28, 30 (Figure 1) or 4 layers of bands 28, 30, 32, 34 (Figure 2) each of which includes preferably steel reinforcing cords 36 are illustrated in Figure 3. The band structure 26 of Figure 2 is characterized in that the cords 36 have filaments with a tensile strength of at least 4000 MPa (N / mm2) (so-called "ultra tensile strength") for 0.20 mm filaments. For example, the cords 36 as illustrated in Figure 3 have four filaments 38, 40, 42 and 44 (38-44) of steel wire of ultra tensile strength. While 2 and 4 layer bands are illustrated in Figures 1 and 2, respectively, other numbers of bands can be substituted. It will be noted that other laminates can be formed using the principles of the present invention to reinforce other articles such as industrial webs and that a single layer of the present invention can be employed with known or conventional layers to also form new useful reinforced composite structures. In a working example, the ropes 36 consist of four filaments 38-44 of ultra-tensile steel wire, finely stretched. There are numerous metallurgical modalities that result in a stress resistance defined above, that is, at least 4,000 MPa as ultra tensile strength (UT). One way to achieve ultra tensile strength is by combining the appropriate process in accordance with that illustrated in U.S. Patent No. 4,960,463, which is incorporated herein by reference in its entirety, with a carbon rod having micro-alloy with one or several of the following elements: Cr, Si, Mn, Ni, Cu, Co, V and B. The preferred chemistry is presented below: C from 0.88 to 1.0 Mn from 0.30 to 0.50 Si from 0.10 to 0.3 Cr from 0.10 to 0.4 V from 0 to 0.1 Cu from 0 to 0.5 Ni from 0 to 0.5 Co from 0 to 0.1 the rest being iron and residues. The resulting rod is then stretched to a tensile strength equivalent to 4, 000 MPa to 0.20mm. Table 1 below provides a description of the strength level calculated for ultra-strain resistant filaments compared to the above high tensile strength and super tensile strength filaments having a filament diameter of 0.20 mm. Ultra tensile strength steel has a higher value than any previously used steel cord or filament. Table 1 Steel rope with high tensile strength, super tensile strength and ultra tensile strength High strength Super tensile strength (HT) tensile strength. to voltage Classification 100 107 117 Resistance to 3400 3650 4000 Voltage (MPa) for filament diameter (D) Resistance to -1400xD -2000xD -2000xD voltage (MPa) pa- +3680 +4050 +4400 ra diameter - Filament (D) The following table 2 shows other embodiments of ultra tensile layer structures compared to the previous layer structures they replace. Some previous layers incorporate polyester or steel with high tensile strength (HT). Table 2 Previous layer structure Structure Maximum rope gauge (mm) Radial tire layers for passenger and light truck vehicles 1) 1100/3 .66 single layer polyester 2) 1100/2 .56 two layer polyester 3) 1840 / 2 .91 rayon 1 layer radial layers for light trucks 4) 1140/3 .76 polyester 2 layers radial bands for medium trucks 5) 27X.175HT 1.05 6) 3x.22 / 9x.20 + lHT .84 7) 3x.22 /9x.20+lHT .84 8) 3x.22 / 9x.20 + lHT .84 layers for off-road use 9) 7xl9x.20 + lHT 3.00 10) 7xl9.20 + lHT 3.00 11) 7xl9x.20 + HT 3.00 Table 2 Ultra tensile-resistant layer structure Structure Maximum rope gauge (mm) Radial tire layers for passenger and light truck vehicles 1) 2x.l8 UT .36 2) 3x.l8 UT .39 3) 3+ dx.lO .91 1X.10 + (6 + 12) x.09 .46 2 + 7X.15 .60 radial layers for light trucks 4) 1 + 5X.18UT .54 with or without wrapping radial bands for medium trucks 6 ) 2 + 7x.22 + lUt .88 7) lx.24 + 6x.22 + lUT .68 8) lx.2 4 + 6x.22UT .68 layers for off-road use 9) 7xl9x.20 + lUT 3.00 10) 7xl2.22 + lUT 2.34 11) 7xl2x.25 + lUT 3.02 candidates 1 and 2 above in table 2 and as per illustrated in Figures 5 and 10 show a replacement of polyester layer with steel layer. Layer structures incorporating UT steel filaments are stronger and reduce the caliber and cost of the material, compared to previous polyester layer structures previously mentioned, which allows to obtain lighter tires in terms of weight and cheaper . Candidate 4, above, in table 2, relates to radial layers for light trucks and is illustrated in figure 11, which shows a replacement of polyester layer with steel layer. In addition, candidates 5,6,7 and 8 above in Table 2, relate to radial layers for medium trucks and are illustrated in Figures 14,12 and 13. These candidates show a replacement of high-strength layer configurations to tension with steel layer configurations of ultra tensile strength. UT's filament layer structures are stronger and reduce caliper and cost compared to the above-mentioned high tensile strength layer structures, which makes the tires lighter in weight and more economical . Candidates 9, 10 and 11 above in TABLE 2 relate to the layers for off-road use as illustrated in Figures 15 and 16. These candidates show a replacement of a high tensile strength layer configuration, such as shown in Figure 15, with the corresponding ultra high tensile steel layer configurations of Figures 15 and 16. As in the previous cases, UT steel filament layer structures are stronger and reduce the size of the material and the cost compared to the previously mentioned high tensile strength layer structures previously mentioned, which makes the tires lighter and more economical. TABLE 3 below compares a current two-layer P225 / P75R15 passenger tire with a layer structure of ultra tensile strength. With the candidate 1, equal resistance was achieved with a smaller tire gauge, an increase in PPE, and a slight increase in weight. With the candidate 2, equal resistance was achieved with a smaller tire gauge, an equal PPE and a decrease in the weight of the tire. With candidate 1, the 1100/2 polyester configurations of layers 1 and 2 were replaced with a UT 2x.l8 configuration. in this case, EPI was increased while maintaining an equal resistance, with a smaller tire caliper and a lower tire weight. With candidate 2, the 1100/2 polyester configuration of layers 1 and 2 was replaced with a UT 3x.l8 configuration. In this case, the resistance and EPI were kept constant while a smaller tire gauge and a smaller tire weight were achieved. Table 3 Benefits of ultra-tensile steel rope Layers - passenger rim P225 / 75R15 Current band structure Two layers Construction EPI 1) layer 1 1100/2 Poly 30 layer 2 1100/2 Poly 30 gauge: 0.084 inch weight: 3.4 lbs 2) layer 1 1100/2 Poly 30 layer 2 1100/2 Poly 30 gauge: 0.084 inch weight: 3.4 lbs Ultra band structure Tension-resistant benefits EPI construction 1) 2x.l8UT 43 equal resistance Lighter tire weight gauge: 0.044 (.8 Ibs lower) inch weight: 2.6 Ibs lower tire caliper 2) 3x.l8 UT 30 resistance equal weight of tire smaller caliber: 0.044 (.8 pounds less) inch weight: 2.6 lbs smaller tire caliper TABLE 4 compares a current 2-layer polyester construction with an ultra-stress-resistant construction on LT235 / 85R16 light truck radial tires of an E load range. With reference to the candidate, an equal resistance was maintained while achieving a lower weight tire and a smaller tire size. When the 1440/3 polyester configuration of layers 1 and 2 was replaced with the 1 + 5X.18 UT configuration, EPI was slightly increased, and equal strength was achieved with a reduction in the weight of the tire and the caliber of the tire. tire. Table 4 Benefits of an ultra tensile steel rope Radial layers for light trucks LTD235 / 85R16 LR-E Current band structure Two layers EPI construction 1) layer 1 1440/3 Poly 27 layer 2 1440/3 Poly 27 gauge: 0.118 inch weight: 6.6 lbs Ultra band structure Benefits stress resistant EPI construction 1) 1 + 5X.18 UT 28 equal resistance Rim weight smaller caliber: 0.061 (0.9 lbs lower) inch weight: 5.7 lbs rim caliber With the use of ultra tensile strength steel filament of at least 4,000 MPa at a diameter of 0.20 mm, several options become available in steel cord design for pneumatic tires for off-road use (OTR), in accordance with what is described in table 12 below. The use of higher tensile strength materials combined with the simplification and / or variation of the current steel rope construction will meet the OTR rim requirements of higher strength per inch while increasing the area of open space between the ropes. . For example, the construction of steel rope cable currently used to reinforce the OTR rim layer for size 36.00R51 and greater is 7x10x20 + l HT. The tensile strength of the filament is specified as 3300 MPa at a filament diameter of? .20 mm. The load to break the average cable is 11,600 N and is used at a rate of 6.4 spikes / inch thus providing a resistance per inch of 74.240 N which meets the design requirement of 73.975 N. The wire gauge of 3.0 mm provides an open space between the strings of 0.965 mm. One main design parameter that can be varied in an elastomer reinforced composite is the tip count per inch (EPI) ie the number of strings per unit length in the lateral direction towards the direction in which the elastomer is being reinforced. Table 12 below presents a view of examples of a current construction with high tensile strength and possible constructions of ultra tensile strength, see candidate 1-3 and figures 15 and 16, showing the general increase in open space between strings according to the increased resistance of the ultra-tensile samples allowed a reduction of PPE. At the other end, a rope diameter is reduced and the tip count is increased to compensate, the open space between the strings is reduced. Generally, an open space between the strings must be kept at a minimum of 0.018 inch (0.26 mm) to provide proper penetration of the elastomers between the strings when they are integrated in this way. This minimum open space between the strings can be obtained particularly with the smaller and simpler diameter rope construction (a smaller number of filaments in the string of candidates 1, 2 and 3. Table 5 Construction Caliber (mm) Burst load EPI (N) Current construction 7xl9x.20 + lHT 3.0 11,600 6.4 Ultra tensile-resistant construction 1. 7xl9x.20 + lUT 3.0 13,570 5.5 2. 7xl2x.22 + lUT 2.34 10,500 7.1 3. 7xl2x.25 + lUT 3.02 13,000 5.7 Stretching in inches (N) Open space between the ropes (mm) Current construction 74,240 .965 Ultra tensile strength construction 1. 74,630 1.62 2. 74,550 1.24 3. 74,100 1.44 candidates 1, 2 and 3 meet the tire design requirements of a resistance per inch of 74.240 N for OTR tires from 36.00R51 to 40.00R57 while providing an open space between the cords increased in all cases (greater than 0.96 mm). This increased open space between the ropes allows a greater penetration of rubber between the ropes which provides better resistance. In addition, candidate 1, when employed at 6.4 EPI (not shown), has an open space area between the 0.965 mm ropes (as with the current construction) while providing a resistance per inch of 83,200 N. This value of resistance per inch exceeds the requirement of 79,800 N / inch for a larger, new OTR 44.00R57 rim. It is evident that, in accordance with the present invention, a strip of reinforced band material with monofilament steel or rope for use in a rim has been provided. The reinforced strip material strip complies with the objectives, means and advantages stated above. While the invention has been described in combination with embodiments thereof, it is evident that many alternatives such as modifications and variations will be apparent to those skilled in the art in view of the foregoing description. Therefore, it is intended to cover all those alternatives, modifications and variations that fall within the spirit and scope of the appended claims.

Claims (1)

1. CLAIMS A pneumatic rim with a casing having parallel strings, two side walls spaced apart by a distance, which in the axial direction determines the overall width of the rim section, two rims from which the tips of the strings extend. the casing, a floor placed on the crown of said casing, a band structure that is circumferentially inextensible interposed between the floor and the casing, and at least one casing layer placed on said side walls between said two flanges and said crown of said casing. casing, said web structure has a width substantially equal to the width of the floor and has a shell layer of elastomeric material reinforced with metal cords, said metal cords in the carcass ply are characterized by a plurality of filaments having a diameter (D ) which is located within a range of 0.07 to 0.45 mm, each filament has a tensile strength of -2000x D + 4400 MPa, of D is the diameter of the filament in mm. The pneumatic tire defined in claim 1, characterized in that D is located within a range of 0.07 to 0.33 mm. The pneumatic tire defined in claim 1, wherein the string construction is selected from the group consisting of 2x, 3x, 4x, 5x, 6x, 7x, 8x, llx, 12x, l + 2m 1 + 3, 1 + 4 , 1 + 5, 1 + 6, 1 + 7, 1 + 8, 1 + 14, 1 + 15, 1 + 16, 1 + 17, 1 + 18, 1 + 19, 1 + 20, 1 + 26, 2 +1, 2 + 2, 2 + 5, 2 + ß, 2 + 7, 2 + 8, 2 + 9, 2 + 10, 2/2, 2/3, 2/4, 2/4, 2/6 , 3 + 1, 3 + 2, 3 + 3, 3 + 4, 3 + 8, 3 + 9, 3/9, 3 + 9 + 15, 4 + 9, 4 + 10, 5/8/14, 7x12 , 7x19, 5 + 1, 6 + 1, 7 + 1, 8 + 1, 11 + 1, 12 + 1, 2 + 7 + 1, 1 + 4 + 1, 1 + 5 + 1, 1 + 6 + 1 , 1 + 7 + 1, 1 + 8 + 1, 1 + 14 + 1, 1 + 15 + 1, 1 + 16 + 1, 1 + 17 + 1, 1 + 18 + 1, 1 + 19 + 1, 1 + 20 + 1, 3 + 9 + 1, 3/9 + 1, 7x12 + 1 and 7x19 + 1. The pneumatic tire defined in claim 3, wherein said rope construction is 1 + 5. The pneumatic tire of claim 1, wherein D is less than 0.12 mm. The pneumatic tire of claim 3, wherein the rope construction is 3 + 8. The pneumatic tire of claim 1, wherein the rope is a multi-layered construction. The pneumatic tire of claim 7, wherein the rope has two layers. The pneumatic tire of claim 7, wherein the rope has 3 layers. The pneumatic tire of claim 7, wherein D is located within a range of 0.07 to not more than 0.12 mm.