Belt structure of a tire

Abstract

To provide a belt of a lightweight and high strength material tire to reduce weight of the tire while maintaining other characteristics.SOLUTION: A tire 10 includes: a carcass ply 13 and 14; a tread 22 disposed radially outward of a crown region 20 of the carcass ply; and a belt structure 30 having overall axial width substantially equal to tread width TW, where the belt structure is interposed between the tread and the crown region for surrounding the carcass ply in a circumferential direction. The belt structure includes a first belt layer 23 and a second belt layer 24 radially adjacent the first belt layer. The first belt layer includes a first reinforced composite with first reinforcement cords embedded in a first rubber matrix. The first reinforcement cords have a structure of 1100 / 4 dtex with a twist between 150 TPM and 250 TPM and dipping tension between 100 mN / tex and 200 mN / tex.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to both pneumatic and non-pneumatic tires, and more particularly to a belt structure inserted between the tread portion of a tire and other structures of the tire.

Background Art

[0002] Tire belt assemblies are known. In one conventional assembly, a folded ply is reinforced with cords of a high modulus of elasticity material and the overall width is made at least equal to the width of the tread portion. Each side thereof is folded back in the radially outer direction around two unfolded single cut plies. The reinforcing cords of the folded ply form an angle between 20 degrees and 60 degrees with respect to the equatorial plane of the tire and are the reinforcing cords of two single cut plies that form equal and opposite angles with respect to the equatorial plane of the tire.

[0003] Due to material constraints, conventional tire structures tended to be robust (e.g., heavy and having many components, etc.). Such structures tend to have high rolling resistance, which reduces fuel efficiency, and the bulk of the structure not only tends to limit handling response but also may increase material costs. Identifying lightweight and high-strength materials and finding appropriate use of such materials in tires so as to reduce the weight of the tire while maintaining other characteristics has been an ongoing goal.

[0004] Aramid reinforcing materials have shown excellent fatigue resistance. This property makes it a suitable material for the application of a relatively low twist to the cords, and it has become possible to maintain durability and elongation characteristics with a lower density material. One conventional belt assembly has shown improved handling characteristics when the reinforcing cords were reduced from 1670 dTex to 1100 dTex. One conventional overlay structure may be reinforced with aramid cords having a twist level between 6 TPI and 14 TPI.

[0005] One conventional belt structure is reinforced with aramid cords from 420 to 1100 dTex, having a measured toughness from 30 MPa to 50 MPa, an initial modulus of elasticity from 15,000 MPa to 40,000 MPa, a tenacity from 140 cN / Tex to 200 cN / Tex, and a dynamic flex fatigue retention failure strength from 50% to 100%. These belts can be reinforced with reinforcing cords that extend parallel to each other and form an angle of 10 degrees to 40 degrees with respect to the equatorial plane (EP) of the tire. The belt assembly includes a folded belt, and the folded portions on each lateral side cover the cut belt and are folded radially. The axially outer portion of the folded belt is folded in the radially outer direction and is disposed radially outside the cut belt.

[0006] Other conventional tires may have an overlay structure disposed radially outside the belt assembly. The helical convolution of the ribbon may be wound axially over two single-cut plies such that the convolutions are in adjacent contact. The ribbon can be reinforced with cords of woven material.

Summary of the Invention

Means for Solving the Problems

[0007] A tire according to the present invention includes a carcass ply, a tread disposed radially outside the crown region of the carcass ply, and a belt structure having an overall axial width substantially equal to the tread width, and the belt structure is inserted between the tread and the crown region in a relationship surrounding the carcass ply in the circumferential direction. The belt structure includes a first belt layer and a second belt layer adjacent to the first belt layer in the radial direction. The first belt layer includes a first reinforcing composite material having a first reinforcing cord embedded in a first rubber matrix. The first reinforcing cord has a twist between 150 TPM and 250 TPM and a production dip tension between 100 mN / tex and 200 mN / tex and has a structure of 1100 / 4 dtex.

[0008] According to another aspect of the tire, the second belt layer includes a second reinforcing composite material having a second reinforcing cord embedded in a second rubber matrix. The second reinforcing cord has a structure of 1210 / 3dtex with a twist between 150 TPM and 250 TPM and a production dip tension between 100 mN / tex and 200 mN / tex.

[0009] According to yet another aspect of the tire, the first reinforcing cord has a Z twist of about 180 TPM.

[0010] According to yet another aspect of the tire, the first reinforcing cord has an S twist of about 180 TPM.

[0011] According to yet another aspect of the tire, the second reinforcing cord has a Z twist of about 200 TPM.

[0012] According to yet another aspect of the tire, the second reinforcing cord has an S twist of about 200 TPM.

[0013] According to yet another aspect of the tire, the first reinforcing cord has a density between 15 EPI and 35 EPI within the first rubber matrix.

[0014] According to yet another aspect of the tire, the first reinforcing cord has a density between 22 EPI and 25 EPI within the first rubber matrix.

[0015] According to yet another aspect of the tire, the first reinforcing cord has a density of about 23 EPI within the first rubber matrix.

[0016] According to yet another aspect of the tire, the second reinforcing cord has a density between 15 EPI and 35 EPI within the second rubber matrix.

[0017] According to still another aspect of the tire, the second reinforcing cord has a density between 22 EPI and 25 EPI within the second rubber matrix.

[0018] According to still another aspect of the tire, the second reinforcing cord has a density of about 24 EPI within the second rubber matrix.

[0019] According to still another aspect of the tire, the first reinforcing cord is formed of aramid.

[0020] According to still another aspect of the tire, the second reinforcing cord is formed of aramid.

[0021] According to still another aspect of the tire, both the first and second reinforcing cords are formed only of aramid.

[0022] The belt structure of the tire according to the present invention includes a first belt layer disposed radially inward from the tread portion of the tire and radially outward from the crown portion of the carcass ply. Each of the first belt layers has a first aramid reinforcing cord having a structure of 1100 / 4 dtex, a twist between 150 TPM and 250 TPM, and a production dip tension between 100 mN / tex and 200 mN / tex. A second belt layer is inserted radially between the first belt layer and the crown portion of the carcass ply. The second belt layer is characterized by having a second aramid reinforcing cord having a structure of 1210 / 3, a twist between 150 TPM and 250 TPM, and a tension between 100 mN / tex and 200 mN / tex.

[0023] According to another aspect of the tire structure, the first reinforcing cord has a Z twist of about 180 TPM.

[0024] According to still another aspect of the tire structure, each of the first reinforcing cord and the second reinforcing cord has a density between 15 EPI and 35 EPI within the first rubber matrix and the second rubber matrix, respectively.

[0025] According to still another aspect of the tire structure, each of the first reinforcing cord and the second reinforcing cord has a density between 22 EPI and 25 EPI within the first rubber matrix and the second rubber matrix, respectively.

[0026] According to still another aspect of the tire structure, the first reinforcing cord has a density of 23 EPI within the first rubber matrix, and the second reinforcing cord has a density of 24 EPI within the second rubber matrix.

[0027] (Definition) As used herein and in the claims as follows.

[0028] "Apex" means an elastomer filler disposed radially above the bead core between the ply and the turn-up ply.

[0029] "Annular" means being formed like a ring.

[0030] Both "aramid" and "aromatic polyamide" mean manufactured fibers, and the fiber-forming substance is generally recognized as a long chain of synthetic aromatic polyamide in which at least 85% of the amide bonds are directly bonded to two aromatic rings. A typical aramid or aromatic polyamide is poly(p-phenylene terephthalamide).

[0031] "Aspect ratio" means the ratio of the tire section height to the tire section width. For example, the aspect ratio may be the maximum axial distance between the outside of the tire sidewall when the tire is inflated at no load and at normal pressure, or it may be the value multiplied by 100% for expressing as a percentage. A low aspect ratio means a tire having an aspect ratio of 65 or less.

[0032] "Aspect ratio of bead cross-section" means the ratio of the height of the bead to the width of the bead cross-section.

[0033] "Asymmetric tread" means a tread having a tread pattern that is not symmetric with respect to the center plane or equatorial plane (EP) of the tire.

[0034] "Axial" and "axially" indicate a line or direction parallel to the axis of rotation of the tire.

[0035] "Bead" means a part of the tire including an annular tension member, which is wound by a ply cord and formed to fit a design rim. At this time, other reinforcing elements such as flippers, chippers, apexes, toe guards and chafers may or may not be used.

[0036] "Belt structure" means at least two annular layers or plies consisting of woven or non-woven parallel cords, which are located under the tread and not fixed to the bead, and have cords inclined with respect to the equatorial plane of the tire. The belt structure may also include a ply of parallel cords inclined at a relatively low angle, which functions as a limiting layer.

[0037] "Bias tire" (cross ply) means a tire in which the reinforcing cords in the carcass ply extend obliquely across the tire from bead to bead at an angle of about 25 degrees to 65 degrees with respect to the equatorial plane of the tire. When there are multiple plies, the ply cords extend at angles opposite to each other in adjacent layers.

[0038] "Breaker" means at least two annular layers or plies consisting of parallel reinforcing cords, and the reinforcing cords have the same angle as the parallel reinforcing cords of the carcass ply with respect to the equatorial plane of the tire. The breaker is usually combined with a bias tire.

[0039] "Cable" means a cord formed by twisting together two or more ply cords.

[0040] "Carcass" means a tire structure separate from the belt structure, tread, undertread, and sidewall rubber on the ply, and includes the bead.

[0041] "Casing" means the carcass, belt structure, bead, sidewall, and all other components of the tire except the tread and undertread, i.e., the entire tire.

[0042] "Chipper" refers to a narrow band consisting of a fabric cord or a steel cord located within the bead region, which has the function of reinforcing the bead region and stabilizing the innermost radial portion of the sidewall.

[0043] "Circumferential" and "circumferentially" mean a line or direction extending along the periphery of the annular surface of the tire that is parallel to the equatorial plane (EP) and perpendicular to the axial direction, and may also refer to a plurality of sets of adjacent circular curves, where in a cross-sectional view, the radii of those circular curves define the axial curvature of the tread.

[0044] "Cord" means one of the reinforcing strands that make up the reinforcing structure of the tire.

[0045] "Cord angle" means the acute angle formed by the cord with respect to the equatorial plane, and means the left and right acute angles in the plan view of the tire. The "cord angle" is measured in a tire that has been cured but not inflated.

[0046] "Yarn twist" means each strand of yarn, and "yarn twist" means that its component filaments are twisted together at a given number of turns per unit length of the yarn (usually expressed as turns per inch (TPI) or turns per meter (TPM)), and in addition, the yarns are twisted together at a given number of turns per unit length of the cord. The twist direction refers to the inclination direction of the helix of the yarn or cord when the twist direction is held vertically. When the inclination of the helix coincides with the inclination and direction of the letter "S", the twist is called "S" or "left-handed". When the inclination of the helix coincides with the inclination and direction of the letter "Z", the twist is called "Z" or "right-handed". It is understood that the "S" or "left-handed" twist direction is opposite to the "Z" or "right-handed" twist. "Yarn twist" is understood to mean the twist previously given to the yarn, the yarn being incorporated into the cord, and "cord twist" is understood to mean the twist given when two or more yarns are twisted together to form the cord, and "dtex" is understood to mean the gram weight of 10,000 meters of yarn before the yarn is given a twist.

[0047] "Cut belt ply" refers to a belt having a width smaller than the tread width, which is positioned flat on the carcass ply in the crown area of the tire.

[0048] "Crown" means the portion of the tire in the vicinity of the tire tread.

[0049] "Denier" means the gram weight per 9000 meters (a unit representing linear density). "Dtex" means the gram weight per 10,000 meters.

[0050] "Density" means the weight per unit length.

[0051] "Elastomer" means an elastic material having the ability to recover its size and shape after deformation.

[0052] "Equatorial plane (EP)" means a plane perpendicular to the axis of rotation of the tire and passing through the center of the tire tread, or a plane including the circumferential center line of the tread.

[0053] "Evolving tread pattern" means a tread pattern whose running surface is intended to contact the road, generating tread wear resulting from the running of the tire on the road surface, and the evolution is predetermined at the time of tire design so as to obtain adhesion and road handling performance that remains substantially unchanged throughout the entire cycle of tire use / wear, regardless of the degree of tread wear.

[0054] "Fabric" means a network structure of a plurality of cords extending substantially in one direction, and the plurality of cords may be twisted or may be composed of a plurality of bundles of a large number of filaments (which may be twisted) made of a high elastic modulus material.

[0055] "Fiber" is a unit of natural or artificial substance that forms the basic element of a filament, and is characterized in that the length is at least 100 times the diameter or width.

[0056] "Number of filaments" means the number of filaments that make up a yarn. Example: 1000 denier polyester has approximately 190 filaments.

[0057] "Flipper" means a fabric arranged around the bead wire for binding the bead wire in terms of strength and within the tire body.

[0058] "Footprint" means the contact surface or contact area between the tire tread and a flat surface under zero speed and normal load and air pressure.

[0059] "Gauge" generally indicates a measured value, specifically a measured value of thickness.

[0060] "Groove" means an elongated void region within the tread that may extend circumferentially or laterally, linearly, curvilinearly, or in a zigzag pattern. Grooves extending circumferentially and laterally sometimes have common portions. "Groove width" can be defined as the tread surface occupied by the groove or groove portion divided by the length of such groove or groove portion, and thus the groove width can be the average width over its entire length. The grooves may vary in depth within the tire. The depth of the grooves may vary around the outer circumference of the tread, or the depth of one groove may be constant but different from the depth of other grooves within the tire. Such narrow or wide grooves that are substantially shallower in depth compared to a wide circumferential groove and interconnect such wide circumferential grooves can be considered to form "tie bars" that tend to maintain rib-like characteristics in the tread area in which they are included. As used herein, the grooves are intended to have a width sufficient to remain open within the tire contact surface or footprint.

[0061] "High-tensile steel (HT)" means carbon steel having a tensile strength of at least 3400 MPa at a filament diameter of 0.20 mm.

[0062] "Inner" means towards the inner side of the tire, and "outer" means towards the outer side of the tire.

[0063] "Innerliner" means one or more layers of an elastomer or other material that forms the inner surface of a tubeless tire and confines the inflation fluid within the tire.

[0064] "Inboard side" means the side of the tire that is closest to the vehicle when the tire is mounted on a wheel and the wheel is mounted on a vehicle.

[0065] "LASE" means the load at a specified elongation.

[0066] "Lateral direction" means the axial direction.

[0067] "Setting length" means the distance that the twisted filament or strand extends and rotates 360 degrees around another filament or strand.

[0068] "Load range" means the load capacity and inflation limit of a given tire used in a specific type of service as defined in the tables of The Tire and Rim Association, Inc.

[0069] "Mega-tensile steel (MT)" means carbon steel having a tensile strength of at least 4500 MPa with a filament diameter at 0.20 mm.

[0070] "Net contact area" means the total area of the elements contacting the ground between the defined boundary edges measured over the entire circumference of the defined tread.

[0071] "Net-to-gross ratio" means the total area of the tread elements contacting the ground between the side edges of the tread around the entire circumference of the tread, divided by the total area of the entire circumference of the tread between the side edges.

[0072] "Non-directional tread" means a tread that does not have a preferred forward direction and does not need to be placed in a specific wheel position of a vehicle to align the tread pattern with the preferred direction of travel. Conversely, a directional tread pattern has a preferred direction of travel that requires a specific wheel position.

[0073] "Normal load" means the specific design inflation pressure and load assigned by an appropriate standardization body for the service conditions of the tire.

[0074] "Normal-tensile steel (NT)" means carbon steel having a tensile strength of at least 2800 MPa at a filament diameter of 0.20 mm.

[0075] The "outerboard side" means the side of the tire that is farthest from the vehicle when the tire is attached to the wheel and the wheel is attached to the vehicle.

[0076] "Ply" means a cord reinforcement layer covered with rubber, which is a cord that is deployed in the radial direction or is otherwise parallel.

[0077] "Radial" and "radially" mean the direction toward or away from the axis of rotation of the tire in the radial direction.

[0078] "Radial ply structure" means one or more carcass plies having reinforcing cords in which at least one ply is oriented at an angle of 65 degrees to 90 degrees with respect to the equatorial plane of the tire.

[0079] "Radial ply tire" means a belted or circumferentially constrained pneumatic tire having cords in which at least one ply extends from bead to bead and is disposed at a cord angle of 65 degrees to 90 degrees with respect to the equatorial plane of the tire.

[0080] "Rib" means a circumferentially extending strip of rubber on the tread defined by either at least one circumferential groove and a second such groove or side edge, and the strip is not transversely divided by a groove that is sufficiently deep.

[0081] "Rivet" means an open space between cords in a layer.

[0082] "Section height" means the radial distance from the nominal rim diameter at the equatorial plane to the outer diameter of the tire.

[0083] "Section width" means the maximum straight-line distance parallel to the tire axis between the outer sides of the sidewalls when inflated for 24 hours at normal pressure and unloaded and thereafter, excluding the height of the sidewalls due to labels, decorations or protective bands.

[0084] The "self-supporting run-flat" means a type of tire that has a structure strong enough to support the load of a vehicle with only the tire structure when the tire is operated in a non-inflated state at limited time and limited speed. Since there is only the tire structure (for example, there is no internal structure), the sidewall and the inner surface of the tire will not collapse or buckle.

[0085] The "sidewall insert" means an elastomer or a cord reinforcing material disposed in the sidewall region of the tire. The insert may be an addition to the carcass reinforcing ply and the outer sidewall rubber forming the outer surface of the tire.

[0086] The "sidewall" means the portion of the tire between the tread and the bead.

[0087] The "siping" or "cut" means a small slot formed in the tread element of the tire that subdivides the tread surface and improves traction, and the siping may be designed to close within the contact surface or footprint, unlike a groove.

[0088] The "spring rate" means the stiffness of the tire represented as the slope of the load deflection curve at a given pressure.

[0089] The "rigidity ratio" means the value obtained by dividing the rigidity value of the target control belt structure by the rigidity value of another belt structure when the value is determined by a fixed three-point bending test in which both ends of the cord are supported and bent by a load hung at the center between the fixed ends.

[0090] The "super high-tensile steel (ST)" means a carbon steel having a tensile strength of at least 3650 MPa at a fiber diameter of 0.20 mm.

[0091] The "toughness" means the stress represented as the force per unit linear density (cN / tex) of a test piece without strain.

[0092] "Tensile stress" is the force expressed as force / cross-sectional area. Strength psi = 12,800 × specific gravity × toughness in grams per denier.

[0093] The "tension" of the cord means the force on the cord expressed as mN / tex.

[0094] "Toe guard" refers to the rim contact portion of the elastomer developed in the circumferential direction of the tire on the inner side in the axial direction of each bead.

[0095] "Tread" means a molded rubber part that includes the portion of the tire that contacts the road during normal load and normal inflation of the tire when attached to the tire casing.

[0096] "Tread element" or "traction element" means a rib or block element.

[0097] "Tread width" means the length of the arc of the tread surface in a plane containing the axis of rotation of the tire.

[0098] "Rotations per inch" or TPI means the number of rotations of the cord twist per inch of the cord.

[0099] "Turnup end" means the portion of the carcass ply that bends upward (i.e., radially outward) from the bead around which the ply is wound.

[0100] "Ultra-High Tensile Steel (UT)" means carbon steel having a tensile strength of at least 4000 MPa at a filament diameter of 0.20 mm.

[0101] "Vertical deflection" means the amount by which the tire deflects under load.

[0102] "Thread" is a general term for continuous strands of textile fibers or filaments and occurs in the following forms: (1) a number of fibers twisted together; (2) a number of fibers arranged together without twisting; (3) a number of fibers arranged together with a certain degree of twist; (4) a single fiber (monofilament) with or without twist; and (5) a narrow strip of material with or without twist. The present invention will be described, by way of example, with reference to the following accompanying drawings.

Brief Description of the Drawings

[0103]

Figure 1

Figure 2

Figure 3

Mode for Carrying Out the Invention

[0104] Referring to FIG. 1, an example of a pneumatic or non-pneumatic tire 10 for use in the present invention is shown. The tire 10 has a pair of substantially non-extensible bead cores 11, 12, which are axially spaced apart together with two carcass plies 13, 14 extending between the bead cores. The carcass plies can be folded axially and radially outwardly around each of the bead cores 11, 12 and reinforced by cords that are substantially parallel to each other within the same ply at an angle of 50 degrees to 90 degrees with respect to the equatorial plane (EP) of the tire 10. The cords belonging to adjacent carcass plies 13, 14 may generally have opposite angles that cross each other at an angle of 2 degrees to 5 degrees. The cords of the carcass plies 13, 14 can be made of any suitable material such as steel, nylon, rayon, aramid, and / or polyester. The tire 10 has a crown region 20 with carcass plies 13, 14 along with a polyester cable or a rayon cable and is reinforced by a belt assembly 21 disposed radially inside the tire tread 22. The tire 10 may have an aspect ratio between 25 and 65.

[0105] The tire 10 further includes a belt structure 30 having a substantially rigid folded belt 23 and a cut belt 24 disposed radially outside the folded belt. Both belts 23, 24 are reinforced with aramid cables or yarns. The belts 23, 24 have the same or different structures. Such cords may be treated (coated) with one or more layers of adhesiveness in a process known as dipping. The elastic modulus of the treated cord may be a function of the twist of the different yarns used in the cord, the twist of the cord, and the way the cord undergoes the dipping operation.

[0106] The cords of the folded belt 23 are substantially parallel to each other and make an angle of 15 to 40 degrees with the equatorial plane (EP) of the tire 10. The axially outer portion of the folded belt 23 may be folded back radially outward on both side surfaces over the axial ends of the cut belt 24 in a situation where the folding portions 25, 26 are symmetric with respect to the equatorial plane (EP). The folding portions 25, 26 may each have a width between 5% and 30% of the tread width (TW), or between 15% and 30%.

[0107] As shown in FIG. 2, a tire 10a of another embodiment used in the present invention includes one carcass ply 13a wound around the beads 11a, 12a. The belt structure 30 includes belts 16, 17 reinforced with aramid cords and overlays 27, 28 disposed radially outside the belts 16, 17. The belts 16, 17 can have the same or different structures. The overlays 27, 28 can be a single sheet of overlay material, a cut overlay (e.g., reinforcing cords within an overlay that are discontinuous at any position over the entire tire), and / or a spiral overlay. The reinforcing cords in the overlays 27, 28 can include nylon, polyester, polyamine, aramid, and / or any other suitable overlay reinforcing material.

[0108] As shown in FIG. 3, according to the present invention, the belts 16, 17, 23, 24 of the belt structure 30 include a reinforced composite material having an aramid reinforcing cord 31 embedded in a rubber matrix 32. The reinforcing cord 31 may be an aramid yarn having component filaments twisted together at a given number of turns per unit length of the yarn (usually expressed in turns per inch, TPI, or turns per meter, TPM). The aramid yarns may be twisted together to form a cord 31 having a twist level.

[0109] The aramid reinforcing cord 31 of the first example of the belt structure 30 has a 1100 / 4 dtex structure and has a cord distribution density of 15 ends per inch (EPI) to 35 EPI, or 22 EPI to 25 EPI, or 23 EPI. The first reinforcing cord 31 has a twist between Z150 / S150 turns per meter (TPM) and Z200 / S200 TPM, or about Z180 / S180 TPM, and a tension between 100 mN / tex and 200 mN / tex, or about 180 mN / tex, or about 120 mN / tex.

[0110] The aramid reinforcing cord 31 of the second example of the belt structure 30 has a 1210 / 3 dtex structure and has a cord distribution density of 15 EPI to 35 EPI, or 22 EPI to 25 EPI, or 24 EPI. The second reinforcing cord 31 has a twist between Z150 / S150 TPM and Z250 / S250 TPM, or about Z200 / S200 TPM, and a tension between 100 mN / tex and 150 mN / tex, or about 120 mN / tex.

[0111] The embodiments of the present invention described above should be considered as illustrative and should not be considered as limiting the scope of the present invention as defined in the following claims. The above and other objects, functions, and advantages of the present invention will be apparent from the above detailed description of the embodiments of the present invention as shown in the accompanying drawings, and in the accompanying drawings, like reference numerals represent like parts of the present invention.

[0112] Modifications of the present invention are possible in light of the description provided herein. Specific representative embodiments and details have been shown for the purpose of explaining the present invention, but it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the scope of the present invention. Therefore, it should be understood that changes can be made in the specific embodiments described as being within the full scope of the present invention as defined by the following appended claims.

Claims

1. A carcass ply, a tread disposed radially outward of the crown region of the carcass ply, and a belt structure having an overall axial width substantially equal to the tread width, wherein the belt structure is inserted between the tread and the crown region so as to circumferentially surround the carcass ply and includes a first belt layer and a second belt layer radially adjacent to the first belt layer, the first belt layer includes a first reinforcing composite having a first reinforcing cord embedded in a first rubber matrix, the first reinforcing cord has a twist between 150 TPM and 250 TPM and a dip tension between 100 mN / tex and 200 mN / tex and has a structure of 1100 / 4 dtex, a tire characterized by that.

2. The second belt layer includes a second reinforcing composite having a second reinforcing cord embedded in a second rubber matrix, the second reinforcing cord having a twist between 150 TPM and 250 TPM and a tension between 100 mN / tex and 200 mN / tex and having a structure of 1210 / 3 dtex, the tire according to claim 1, characterized by that.

3. The first reinforcing cord has a Z twist of 180 TPM, the tire according to claim 1, characterized by that.

4. The first reinforcing cord has an S twist of 180 TPM, the tire according to claim 3, characterized by that.

5. The second reinforcing cord has a Z twist of 200 TPM, the tire according to claim 2, characterized by that.

6. The second reinforcing cord has an S twist of 200 TPM, the tire according to claim 5, characterized by that.

7. The first reinforcing cord has a density between 15 EPI and 35 EPI within the first rubber matrix, the tire according to claim 1, characterized by that.

8. The first reinforcing cord has a density between 22 EPI and 25 EPI within the first rubber matrix, the tire according to claim 7, characterized by that.

9. The first reinforcing cord has a density of 23 EPI within the first rubber matrix, the tire according to claim 8, characterized by that.

10. The second reinforcing cord has a density between 15 EPI and 35 EPI within the second rubber matrix, the tire according to claim 2, characterized by that.

11. The tire according to claim 10, wherein the second reinforcing cord has a density between 22 EPI and 25 EPI within the second rubber matrix.

12. The tire according to claim 11, wherein the second reinforcing cord has a density of 24 EPI within the second rubber matrix.

13. The tire according to claim 1, wherein the first reinforcing cord is formed of aramid.

14. The tire according to claim 2, wherein the second reinforcing cord is formed of aramid.

15. The tire according to claim 2, wherein both the first and second reinforcing cords are formed only of aramid.

16. A first belt layer disposed radially inward from the tread portion of the tire and radially outward of the crown portion of the carcass ply, wherein each of the first belt layers has a structure of 1100 / 4 dtex, a twist between 150 TPM and 250 TPM, and a dip tension between 100 mN / tex and 200 mN / tex. It has a first aramid reinforcing cord, A second belt layer inserted radially between the first belt layer and the crown portion of the carcass ply, wherein each of the second belt layers has a structure of 1210 / 3 dtex, a twist between 150 TPM and 250 TPM, and a tension between 100 mN / tex and 200 mN / tex. It has a second aramid reinforcing cord, which is a belt structure of a tire.

17. The belt structure according to claim 16, wherein the first reinforcing cord has a Z twist of 180 TPM.

18. The belt structure according to claim 16, wherein both the first reinforcing cord and the second reinforcing cord have a density between 15 EPI and 35 EPI within the first rubber matrix and the second rubber matrix, respectively.

19. The belt structure according to claim 16, wherein both the first reinforcing cord and the second reinforcing cord have a density between 22 EPI and 25 EPI within the first rubber matrix and the second rubber matrix, respectively.

20. The belt structure according to claim 16, wherein the first reinforcing cord has a density of 23 EPI in the first rubber matrix, and the second reinforcing cord has a density of 24 EPI in the second rubber matrix.

Images