TIRES

Abstract

[Object] An object of the present invention is to further improve steering stability. [Solution] A tire is provided which comprises a carcass portion and a belt portion, wherein a carcass ply constituting the carcass portion is a carcass ply formed from a ply cord having a line density of more than 4,400 dtex, the belt portion is formed by superposing at least two or more layers, the belt layers are formed from a belt cord having a structure in which four filaments are simply twisted, and a diameter Pr (mm) of the ply cord, a diameter Br (mm) of the belt cord, and a tire radial distance Bg (mm) between the belt cords in adjacent belt layers satisfy the following expression: ( Br + Bg ) / Pr ≤ 1 .00 .

Description

Technical FieldThe present invention relates to a tire.Prior ArtPTL 1 describes a tire including a bead portion, a carcass portion, a belt portion, and a band portion.Citation ListPatent Literature[PTL 1] Japanese Unexamined Patent Publication No. 2005-239069.SUMMARY OF THE INVENTIONTechnical ProblemAn object of the present invention is to further improve steering stability.Solution to the ProblemAccording to an embodiment of the present invention, there is provided a tire comprising:a carcass portion; anda belt portion,wherein a carcass ply constituting the carcass portion is a carcass ply formed from a ply cord having a line density of more than 4,400 dtex,the belt portion is formed by superimposing at least two or more layers that are belt layers formed of a belt cord having a structure in which four filaments are twisted easily, anda diameter Pr (mm) of the ply cord, a diameter Br (mm) of the belt cord, and a tire radial distance Bg (mm) between the belt cords in adjacent belt layers satisfy the following expression:Advantageous Effects of the InventionAccording to the present invention, it is possible to further improve the steering stability.Brief Description of the DrawingsFIG. 1 is a schematic cross-sectional view for an explanatory description of a tire according to an embodiment of the present invention. FIG. 2 is a view for explanatory description of a diameter of a cord in the present invention.DESCRIPTION OF EMBODIMENTS[1] Characteristics of Tires According to the Present InventionFirst, characteristics of a tire according to the present invention will be described.1. OverviewA tire according to the present invention is a tire including a carcass portion and a belt portion. Moreover, a carcass ply constituting the carcass portion is a carcass ply formed of a ply cord having a line density of more than 4,400 dtex, and the belt portion is formed by superimposing at least two or more layers which are belt layers formed of a belt cord having a structure (1×4 structure) in which four filaments are singly twisted. Further, a diameter Pr (mm) of the ply cord, a diameter Br (mm) of the belt cord, and a tire radial distance (distance between belts) Bg (mm) between the belt cords in adjacent belt layers satisfy the following expression:By having these properties, as described later, it is possible to further improve the steering stability.2. Mechanism for Showing Effect in Tires of the Present InventionA mechanism for exhibiting the above-described effect in the tire according to the present invention is assumed as follows.(1) Carcass PortionIn the tire according to the present invention, a carcass ply constituting the carcass portion is a carcass ply formed of a ply cord having a line density (also referred to as "total thickness") of more than 4,400 dtex.The lateral spring constant can be increased by forming the carcass ply using a ply cord having a line density of more than 4,400 dtex thicker than a ply cord having a line density of 2,200 to 4,400 dtex in the related art, thereby making it possible to change (reduce) the degree of deflection generated in a side portion during driving. Therefore, it is considered possible to improve the steering stability. Note that the line density of the ply cord is preferably 6,600 dtex or less.Note that the line density of the above-described ply cord can be measured in accordance with a method specified in JIS L1017:2002.The carcass portion is composed of a layer of a carcass ply and is preferably locked by folding the periphery of a bead core from the inside to the outside. As a result, it is possible to sufficiently reduce the bending rigidity in an axial direction, it is possible to sufficiently bend the side portion in a case where a camber angle is applied during turning, and it is possible to allow a tread surface to come into contact with the ground. Therefore, it is considered possible to improve the steering stability. Note that the carcass portion may be configured by using two or more layers of the carcass ply.Moreover, it is considered that low fuel consumption of the tire can be improved by using such a carcass portion.(2) Belt PortionBy forming the belt portion by superimposing at least two or more belt layers formed of a steel cord of four filaments (1×4 structure) as the belt cord, the cross-sectional shape of the belt cord is made to approach a circular shape to make the cord diameter smaller, making it possible to make the thickness (cover thickness) of the rubber with which the belt cord is covered thinner. Therefore, it is considered that the low fuel consumption of the tire can be improved.Here, the filament constituting the belt cord preferably has a cross-sectional shape having a circular shape; however, the cross-sectional shape thereof may be an elliptical shape. Moreover, among the four filaments, one or two or more filaments may be wave-shaped and may be subjected to a plating treatment.Further, in the present invention, the diameter Pr (mm) of the ply cord, the diameter Br (mm) of the belt cord, and the inter-belt distance Bg (mm) satisfy the following expression:This makes it possible to make the belt portion have a thickness thinner than that of the carcass ply, and thus the shear rigidity during running is increased to enhance the response to the lateral force. Therefore, it is considered that the steering stability can be improved and also the low fuel consumption of the tire can be improved.Note that ((Br+Bg) / Pr) described above is more preferably 0.99 or less, even more preferably 0.95 or less, and even more preferably 0.90 or less. On the other hand, the lower limit thereof is not particularly limited; however, it is preferably 0.80 or more, more preferably 0.85 or more, and even more preferably 0.854 or more.As described above, since the carcass portion and the belt portion are suitably formed in the present invention, the respective effects described above cooperate to be shown synergistically. Therefore, it is considered that the steering stability can be improved and also the low fuel consumption of the tire can be improved.Note that, in the above description, the term "cord diameter" refers to a diameter of a circumscribed circle in a case where a circumscribed circle of a cross section perpendicular to an extending direction of the cord is a perfect circle, and refers to an equivalent circle diameter (a diameter of a circle in a case where a perfect circle having the same cross-sectional area is assumed) in a case of an ellipse or the like. As a specific example, FIG. 2 shows the diameter of a cord having a 1×4 structure. In Fig. 2, a cord (large circle) is composed of four filaments (small circles), and D is the diameter of the cord. For example, the "cord diameter" of the ply cord can be measured in accordance with a method specified in JIS L 1017:2002 "Test methods for chemical fiber tire cords". The "cord diameter" of the belt cord can be measured, for example, in accordance with a test method specified in JIS G 3510:1992 "Testing methods for steel tire cords".Moreover, in a case where each of the belt cords in the two belt layers is present on an equator in a tire meridian cross section, the tire radial distance (distance between belts) Bg between the belt cords in the adjacent belt layers can be determined by measuring the radial distance between the two belt cords (cross sections of the two belt cords) on the equator. Moreover, in a case where only one belt cord is located on the equator and the other belt cord is not located on the equator, the tire radial distance (distance between belts) Bg can be determined by measuring the radial distance between the belt cord closest to the equator and the belt cord present on the equator.[2] More preferred aspect of tire according to the present inventionThe tire according to the present invention can achieve a greater effect by using the following aspect.1. Cord Diameter of Belt CordIn the present invention, the cord diameter of the belt cord is preferably 0.42 mm or more and 0.56 mm or less. This makes it possible to make the belt portion have a thinner thickness. Therefore, it is considered that it is possible to further improve the steering stability, and it is also possible to achieve the lower fuel consumption of the tire. The cord diameter of the belt cord is more preferably 0.45 mm or more, and the upper limit thereof is more preferably 0.53 mm or less, and even more preferably 0.52 mm or less.2. ends in the carcass portion and the belt portionIn the present invention, in a case where the difference between the number of cords (ends) E CA per 50 mm in width in the carcass portion in a tire width direction and the number of cords (ends) E BE per 50 mm in width in the belt portion in the tire width direction is decreased to bring the value of flexural rigidity of the carcass portion and the value of flexural rigidity of the belt portion close to each other, the balance between the deflection in the side portion and the ground contact property in the tread portion is improved. Therefore, it is considered that the steering stability can be further improved. Note that, in the present specification, "ends" means "the number of cords per 50 mm in width in the tire width direction". The "ends" can be measured, for example, in accordance with a method specified in JIS L 1017:2002 "Test methods for chemical fiber tire cords".Specifically, it is assumed that it is possible to further improve the steering stability in a case where the difference between the ends of the carcass portion and the ends of the belt portion is set to 15 or less. That is, it is considered that the steering stability can be further improved in a case where the following expression is satisfied.Note that |E CA- E BE| is more preferably 10 or less, even more preferably 6 or less, even more preferably 5 or less, and particularly preferably 0.3. Ends of Belt PortionIn the present invention, the number of cords (ends) per 50 mm in width in the belt portion is preferably 45 or less, and more preferably 40 or less.In a case where the ends are reduced in such a manner, the bending rigidity in the belt portion can be reduced. Therefore, it is considered that the ground contact property in the tread portion is improved, and it is possible to further improve the steering stability.4. Average Degree of Elongation and Heat Shrinkage Rate of Ply CordIn the present invention, it is preferable that both the average degree of elongation and the heat shrinkage rate in the ply cord are low.From the viewpoint of steering stability, an organic fiber cord having a low average degree of elongation and a high modulus, such as rayon, a polyamide synthetic fiber, or a polyester synthetic fiber, is generally suitably used as the ply cord. However, these fiber cords undergo heat shrinkage during vulcanization, causing a decrease in modulus. Therefore, it is considered that it is possible to further improve steering stability by lowering both the average elongation degree and the heat shrinkage rate to improve the modulus of the tire after vulcanization.In particular, the sum of an average elongation degree (%) and a heat shrinkage rate (%) of the ply cord is preferably less than 8.3, more preferably 7.5 or less, and still more preferably 7.3 or less. This makes it possible to improve the modulus in the tire after vulcanization and to increase the lateral spring constant. Therefore, it is considered that it is possible to further improve the steering stability by reducing the deflection generated in the side portion.Note that the average degree of elongation (%) of the cord can be determined from the degree of elongation (%) under a load of 132 N in a "load-elongation" curve of the cord obtained in an environment of room temperature (25° C.±2° C.) in accordance with "JIS L 1017:2002 Test methods for chemical fiber tire cords".Moreover, the heat shrinkage rate (%) of the cord can be determined from a ratio y / x (%) of an amount of shrinkage y (mm) to a length x (mm) of the cord before being allowed to be left in a case where the cord (ply cord) is allowed to be left in accordance with "JIS L 1017:2002 Test methods for chemical fiber tire cords", in a state of no load and at a temperature of 180° C. for 30 minutes.[3] EmbodimentsHereinafter, the present invention will be specifically described based on the embodiments.1. Tire According to Present EmbodimentFIG. 1 is a schematic cross-sectional view for an explanatory description of a tire according to the present embodiment, and shows a tire meridian cross-section including a rotation axis of the tire in a normal state.Here, the term "normal state" refers to a state in which the tire has been subjected to rim mounting on a normal rim, a normal internal pressure has been applied, and moreover, there is no load.It should be noted that the term "normal rim" is a rim defined for each tire by a standard in a standard system including the standard on which the tire is based. For example, in a case of The Japan Automobile Tire Manufacturers Association(JATMA ), it refers to a standard rim with respect to the applicable size described in "JATMA YEAR BOOK", in a case of The European Tire and Rim Technical Organization (ETRTO), it refers to "Measuring Rim" described in "STANDARDS MANUAL", or in a case of The Tire and Rim Association (TRA), it refers to "Design Rim" described in "YEAR BOOK". Here, JATMA, ETRTO, and TRA are referred to in this order following a standard regarding an applicable quantity in a case where there is an applicable quantity in a case of referencing. Moreover, the normal rim refers to a rim capable of rim-mounting a tire in a case where the tire is not defined in the standard, wherein an internal pressure can be maintained, that is, a rim having the smallest rim diameter and then a rim having the narrowest rim width among rims that do not cause air leakage between a rim and a tire.Moreover, the term "normal internal pressure" refers to air pressure defined for each tire by each standard in a standard system including the standard on which the tire is based, and refers to "the maximum air pressure" in a case of JATMA, "INFLATION PRESSURE" in a case of ETRTO, or "INFLATION PRESSURE" in a case of TRA, or the maximum value described in the table "TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES". Here, JATMA, ETRTO, and TRA are referred to in this order following a standard regarding an applicable quantity in a case where there is an applicable quantity in a case of referencing. In a case of a tire not defined in the standard, the normal internal pressure refers to a normal internal pressure (which is 250 KPa or more) with respect to another tire size (which is defined in the standard) described for the above-described normal rim as a standard rim. Note that, in a case where a plurality of normal internal pressures of 250 KPa or more are described, the minimum value below is referred to.As illustrated in FIG. 1, a tire 1 includes a tread portion 2, a sidewall portion 3, a bead portion 4, a carcass portion 6, and a belt portion 7.(1) Carcass PortionThe carcass portion 6 is composed of a carcass ply 6A and is locked by folding the circumference of the bead core 5 of the bead portion 4 from the tread portion 2 through the sidewall portion 3 from the inside to the outside.Note that, in FIG. 1, 6 ais an inner main body portion of the carcass ply 6A, 6 bis an outer folded portion, and for example, a bead apex rubber 8 extending outward from the bead core 5 in the tire radial direction is disposed between the inner main body portion 6 aand the outer folded portion 6 b.The carcass ply 6A is configured to be covered with a predetermined rubber composition for a carcass ply on both surfaces of a cord arrangement body in which a ply cord having a line density of more than 4,400 dtex is arranged to have predetermined ends (not illustrated in the drawing).By using such a carcass portion 6 as described above, the lateral spring constant can be increased to reduce the degree of deflection generated in the side portion during running. Therefore, it is considered possible to improve the steering stability.Note that, as the ply cord, an organic fiber cord having a low average degree of elongation and a high modulus, such as rayon, a polyamide synthetic fiber, or a polyester synthetic fiber as described above, can be suitably used, and in examples described later, a ply cord containing a polyethylene terephthalate (PET) fiber is used.(2) Belt PortionThe belt portion 7 is disposed on an outer side of the carcass portion 6 in the radial direction and on an inner side of the tread portion 2.The belt portion 7 is configured of one or more belts, and in FIG. 1, the belt layer 7 is configured of a first belt 7A located on the inner side in the tire radial direction and a second belt 7B located on the outer side of the first belt 7A. It should be noted that three or more belts may be used.The belt is produced by covering a predetermined rubber composition for a belt on both surfaces of a cord arrangement body so as to have a thickness thinner than that of the carcass ply in which a belt cord having a 1×4 structure is arranged so as to have predetermined ends. The belt cord is preferably made of a metal and is in particular made of steel. In examples described below, a belt cord having a 1×4 structure in which a steel filament having a cross-sectional shape of a perfect circle is easily twisted without being corrugated is used.By using such a belt portion 7 as described above, the low fuel consumption of the tire can be improved, and the shear rigidity during running is also increased to enhance the response to the lateral force. Therefore, it is considered possible to improve the steering stability.2. Use of Sustainable MaterialIn the tire according to the present invention, the belt and the carcass ply described above are produced by coating both surfaces of the cord assembly body with a rubber composition publicly known in the art. However, in consideration of the strong demand for environmental protection, it is recently preferred to replace a material constituting these rubber compositions with a sustainable material.(1) Rubber MaterialFor example, as a raw material (monomer) of a synthetic rubber such as SBR or BR, instead of a petroleum derived material, a material recycled from a rubber product such as a tire or a non-rubber product such as polystyrene may be used.The monomer (recycled monomer) obtained by recycling is not particularly limited, and examples thereof include butadiene derived from recycling and aromatic vinyl derived from recycling. Examples of the butadiene include 1,2-butadiene and 1,3-butadiene. Moreover, the aromatic vinyl is not particularly limited, and examples thereof include styrene. Among them, it is preferable to use, as a raw material, butadiene (recycled butadiene) and / or styrene (recycled styrene) derived from recycling.A production method of the recycled monomer is not particularly limited, and an example thereof includes a method in which the recycled monomer is synthesized from recycled-derived naphtha obtained by decomposing a rubber product such as a tire. Moreover, a production method for the naphtha derived from recycling is not particularly limited, and for example, a rubber product such as a tire may be decomposed under high temperature and pressure, may be decomposed with a microwave, or may be extracted after mechanical crushing.Further, the raw material (monomer) of the synthetic rubber such as SBR or BR may be a raw material derived from biomass. The biomass-derived monomer (biomass monomer) is not particularly limited, and examples thereof include a biomass-derived butadiene and a biomass-derived aromatic vinyl compound. Examples of the butadiene include 1,2-butadiene and 1,3-butadiene. The aromatic vinyl is not particularly limited, and examples thereof include styrene. Moreover, a production method for the biomass monomer is not particularly limited, and examples thereof include those obtained by biological and / or chemical and / or physical conversion of animals and plants. Fermentation by microorganisms is typical of biological conversion, and chemical and / or physical conversion includes conversion by a catalyst, conversion by a high temperature, conversion by a high pressure, conversion by electromagnetic waves, conversion by a critical liquid, and a combination thereof. Examples of biomass sources of these monomers include sugars, wood, plant residues after detection of useful components, ethanol of plant origin, and biomass naphtha.A polymer (biomass polymer) synthesized from the biomass monomer component is not particularly limited, and examples thereof include polybutadiene rubber synthesized from a biomass-derived butadiene and an aromatic vinyl butadiene copolymer synthesized from a biomass-derived butadiene and / or a biomass-derived aromatic vinyl. Examples of the aromatic vinyl / butadiene copolymer include a styrene-butadiene rubber synthesized from a biomass-derived butadiene and / or a biomass-derived styrene.Note that whether or not the raw material of the polymer is derived from biomass can be determined by pMC (Percent Modern Carbon) measured in accordance with D6866-10.The pMC is a ratio of a 14 C concentration of a sample to a 14 C concentration of the modern standard reference carbon (modern standard reference), and this value is used as an index indicating the biomass content of the compound (rubber). The meaning of this value is described below.In one mole of carbon atoms (6.02×10 23 atoms), about 6.02×10 11 atoms of 14 C, which is about one billion position of the general carbon atoms, are present. 14 C is referred to as a radioisotope, has a half-life of 5,730 years, and the amount thereof regularly decreases. It takes 226,000 thousand years for complete disintegration thereof. Therefore, in the fossil fuels such as coal, petroleum and natural gas, which may have passed 226,000 thousands of years or more after carbon dioxide and the like are incorporated in the air into plants and the like and then fixed, all the 14 C elements initially contained therein are decomposed. Therefore, fossil fuels such as coal, petroleum and natural gas do not contain any 14 C elements at all in the present 21st century. Therefore, the chemical substances produced from these fossil fuels as raw materials also do not contain any 14 C elements at all.On the other hand, 14 C is continuously generated by the nuclear reaction of the commiscous rays in the air, the generation of 14 C is balanced with a decrease due to the radioactive decay, and thus the amount of 14 C is a constant amount in the atmospheric environment of the earth. As a result, the 14 C concentration of the biomass resource-derived substance circulating in the current environment is a value of about 1×10 -12 mol %, or the like, with respect to the total S atoms as described above. As a result, the rate (biomass fraction) of the compound derived from a natural resource (a compound derived from a biomass resource) in a certain compound (rubber) can be calculated by using the difference between these values.This 14 C is generally measured as follows. The accelerator mass spectrometry method using a tandem accelerator is used to measure a 13 C concentration ( 13 C / 12 C}) and a 14 C concentration ( 14 C / 12 C). In the measurement, the 14 C concentration in the circulating carbon in the natural world in 1950 is used as the modern standard reference serving as the reference for the concentration of 14 C. As a specific standard substance, an oxalic acid standard substance provided by the National Institute of Standards and Technology (NIST) is used. The specific radioactivity of carbon in oxalic acid (the radioactivity intensity of 14 C per 1 g of carbon) is separated for each carbon isotope, corrected to a constant value for 13 C, and subjected to attenuation correction from 1950 to the measurement date, thereby obtaining a value to be used as the value (100%) of the standard 14 C concentration. A ratio of this value to the value of the actually measured sample is the pMC value.As a result, in a case where the rubber is made 100% of a substance derived from biomass (natural basis), although there is a regional difference or the like, and thus the rubber has a value of about 110 pMC (currently, the rubber does not often reach 100) in the normal state. On the other hand, in a case where the 14 C concentration of a chemical substance derived from a fossil fuel such as petroleum is measured, the chemical substance shows about 0 pMC (for example, 0.3 pMC). This value corresponds to 0% of the biomass fraction described above.From the above, it is suitable to use, in the rubber composition, a material such as rubber having a high pMC value, that is, a material such as rubber having a high biomass content in view of environmental protection.Moreover, it is also preferable to use vulcanized rubber particles as the rubber material.The vulcanized rubber particles are particles including vulcanized rubber as a material, and particularly a rubber powder or the like specified in JIS K 6316:2017 can be used. From the viewpoint of environmental and cost consideration, a regenerated rubber powder made from a powder product of a used tire or the like is preferable. One kind thereof may be used alone, or two or more kinds thereof may be used in combination.The vulcanized rubber particles are not particularly limited, and may be unmodified vulcanized rubber particles or may be modified vulcanized rubber particles.As a commercially available product of the vulcanized rubber particles, for example, a product of Lehigh Technologies, Inc., MURAOKA RUBBER COLLECTING Co., Ltd., or the like can be used.(2) SilicaThe rubber composition generally contains silica as a reinforcing filler. However, it is also preferred to use residual silica instead of a mineral-derived raw material such as quartz.The silica is not particularly limited, and it is possible to use those usually used in the tire industry, for example, a silica (anhydrous silica) produced by a dry type method and a silica (hydrous silica) produced by a wet type method. The raw material of silica is not particularly limited. For example, it may be a mineral-derived raw material such as quartz, or may be a biologically-derived raw material such as rice hulls (for example, silica obtained by using a biomass material such as rice hulls as a raw material), and recycled silica from a product containing silica may be used. Among the above, the hydrous silica produced by a wet type method is preferred for the reason that the number of silanol groups is large. This silica may be used alone, or two or more thereof may be used in combination.Silica obtained by using a biomass material as a raw material can be obtained, for example, by extracting a silicate from rice hull ash obtained by burning rice hulls by using a sodium hydroxide solution and then by filtering, washing, drying, and crushing a precipitate of silica produced by reacting the silicate with sulfuric acid in the same manner as in the case of the wet type silica in the related art.For the silica recycled from a product containing silica, silica recovered from a product containing silica, for example, an electronic component such as a semiconductor, or a filter material such as a tire, a desiccant, or diatomaceous earth, may be used. Moreover, a method for performing recovery is not particularly limited, and examples thereof include thermal decomposition, electromagnetic wave decomposition, and the like. Among the above, silica recovered from an electronic component such as a semiconductor or from a tire is preferred.In a case where silica is crystallized, it is not dissolved in water, and the component of silica, that is, silica, cannot be used. By managing the combustion temperature and the combustion time, it is possible to suppress the crystallization of silica in the rice hull ash (see Japanese Unexamined Patent Publication No. 2009-2594, Akita Prefectural University Web Journal B / 2019, vol. 6, pp. 216-222, and the like).For the amorphous silica extracted from rice hulls, amorphous silica commercially available from Wilmar International Limited and the like can be used.Note that this silica may be used alone or two or more kinds thereof may be used in combination. It is to be noted that it is preferable from the viewpoint of environmental protection to use sustainable silica such as biomass silica or recycled silica.(3) Carbon blackMoreover, it is also usual that the rubber composition contains carbon black as a reinforcing filler, and it is also preferable to use a lasting carbon black as such a carbon black.The carbon black is not particularly limited, and examples thereof include N134, N110, N220, N234, N219, N339, N330, N326, N351, N550, and N762.The raw material of the carbon black may be, in addition to the mineral oil, a biomass material such as lignin and vegetable oil, or may be a thermally decomposed oil obtained by subjecting a rubber product containing carbon black such as a used tire to thermal decomposition (regenerated carbon black), and it is suitable to use these lasting carbon blacks from the viewpoint of environmental protection.Moreover, a production method for the carbon black may be a combustion production method such as a furnace method, may be a production method by a hydrothermal carbonization (HTC) method, or may be a production method by thermal decomposition of methane by a thermal carbon black method, or the like.As a commercially available product thereof, it is possible to use a product manufactured by ASAHI CARBON CO., LTD., Cabot Japan K.K., TOKAI CARBON CO., LTD., Mitsubishi Chemical Corporation, Lion Specialty Chemicals Co., Ltd., NIPPON STEEL Chemical & Material Co., Ltd., or Columbia Carbon. These may be used alone, or two or more kinds thereof may be used in combination.(4) Softener ComponentFor the rubber composition, a softening agent component is used as needed from the viewpoint of imparting plasticity to the rubber component and suitably dispersing the powder material during kneading. It should be noted that the concept of the softener component herein includes both a liquid softener at 25° C. and a solid softener at 25° C.Examples of the softening agent include a resin component, an oil, a liquid polymer, and an ester-based plasticizer. The softening agent may be a softening agent derived from a mineral resource such as petroleum or natural gas, may be a softening agent derived from biomass, or may be a softening agent derived from naphtha recycled from rubber products or non-rubber products. Moreover, a hydrocarbon component having a low molecular weight obtained by the thermal decomposition and extraction of a used tire or a used product containing various components can be used as a softening agent, and among them, as a lasting softening agent, a softening agent derived from biomass or derived from recycling is preferred.Note that these softeners may be used alone, or two or more kinds thereof may be used in combination. The content of the plasticizer component with respect to 100 parts by mass of the rubber component is preferably 15 parts by mass or more, more preferably 20 parts by mass or more, and even more preferably 25 parts by mass or more. The upper limit is, for example, preferably 40 parts by mass or less, more preferably 35 parts by mass or less, and even more preferably 30 parts by mass or less. Note that the content of the plasticizer component also includes the amount of the oil contained in rubber (oil-extended rubber) or the like.(i) OilExamples of the oil include mineral oil, vegetable oil and animal oil. Moreover, from the viewpoint of ecobalance, a waste oil used in a rubber mixer or an engine or an oil obtained by refining a waste feed oil used in a restaurant may be used.(i-1) Mineral OilThe mineral oil refers to an oil derived from a mineral resource such as petroleum or natural gas. Examples of the mineral oil include a paraffin-based oil (mineral oil), a naphthene-based oil, and an aromatic oil.Examples of the specific mineral oil include mild extract solvate (MES), distilled aromatic extract (DAE), treated distilled aromatic extract (TDAE), treated residual aromatic extract (TBE), and residual aromatic extract (RAE).Moreover, an oil having a low content of a polycyclic aromatic compound (PCA) may also be used for environmental measures. Examples of the low PCA content process oil include MES, TDAE, and a naphthene-based heavy oil.Examples of the commercially available mineral oil include paraffin-based, flavor-based and naphthene-based oils. It is possible to use a product manufactured by, for example, Idemitsu Kosan Co., Ltd., SANKYO YUKA KOGYO K.K., ENEOS Corporation, Olisoy, H&R Group, HOKOKU CORPORATION, Showa Shell Sekiyu K.K., or Fuji Kosan Company, Ltd. These may be used alone, or two or more kinds thereof may be used in combination.(i-2) Vegetable OilExamples of the vegetable oil include linseed oil, rapeseed oil, thistle oil, soybean oil, corn oil, cottonseed oil, rice bran oil, tall oil, sesame oil, wild sesame oil, castor oil, tung oil, pine oil, pine tar oil, sunflower oil, coconut oil, palm oil, palm kernel oil, olive oil, camellia oil, jojoba oil, macadamia nut oil, peanut oil, grape seed oil, and Japanese wax.Further, examples of the vegetable oil also include sustainable vegetable oils such as a refined oil (salad oil or the like) obtained by refining the above-described oil, an ester-exchanged oil obtained by subjecting the above-described oil to ester exchange, a hardened oil obtained by hydrogenating the above-described oil, a thermally polymerized oil obtained by subjecting the above-described oil to thermal polymerization, an oxidatively polymerized oil obtained by subjecting the above-described oil to oxidation, and a waste feed oil obtained by recovering the oil used as the feed oil. It should be noted that the vegetable oil may be a liquid or a solid at normal temperature (25° C.). These vegetable oils may be used alone, or two or more kinds thereof may be used in combination.The vegetable oil preferably contains acylglycerol and more preferably contains triacylglycerol. Note that the acylglycerol refers to a compound obtained by subjecting a hydroxy group of glycerol and a fatty acid to ester linkage. The acylglycerol is not particularly limited, and it may be 1-monoacylglycerol, may be 2-monoacylglycerol, may be 1,2-diacylglycerol, may be 1,3-diacylglycerol, or may be triacylglycerol. Further, the acylglycerol may be a monomer, may be a dimer, or may be a multimer that is a trimer or more. Note that an acylglycerol which is a dimer or more can be obtained by thermal polymerization, oxidative polymerization, or the like. Moreover, the acylglycerol may be a liquid or a solid at normal temperature (25° C.).A method of checking whether or not acylglycerol is contained in the rubber composition is not particularly limited; however, the check may be performed by 1 H-NMR measurement. For example, in a case where a rubber composition mixed with triacylglycerol is immersed in heavy chloroform at normal temperature (25° C.) for 24 hours, the rubber composition is removed, 1 H-NMR is subsequently measured at room temperature, and a signal of tetramethylsilane (TMS) is set to be 0.00 ppm, signals of about 5.26 ppm, about 4.28 ppm, and about 4.15 ppm are observed. It is presumed that these signals are signals derived from a hydrogen atom bonded to a carbon atom adjacent to the oxygen atom of the ester group, and thus the inclusion of the acylglycerol can be checked. Here, the term "about" refers to a range of ±0.10 ppm.Note that the fatty acid is not particularly limited, and may be an unsaturated fatty acid or a saturated fatty acid. Examples of the unsaturated fatty acid include a monovalent unsaturated fatty acid such as oleic acid and a polyvalent unsaturated fatty acid such as linoleic acid or linolenic acid. In addition, examples of the saturated fatty acid include butyric acid and lauric acid.Among them, it is desirable that the fatty acid contains a fatty acid having a small number of double bonds, that is, a saturated fatty acid or a monovalent unsaturated fatty acid, and oleic acid is preferable. As the vegetable oil containing such a fatty acid, for example, a vegetable oil containing a saturated fatty acid or a monovalent unsaturated fatty acid, or a vegetable oil subjected to modification such as ester exchange, may be used. Moreover, a plant for producing a vegetable oil containing such a fatty acid can be improved by breeding, genetic recombination, genome editing or the like.As the vegetable oil, it is possible to use those commercially available from, for example, Idemitsu Kosan Co., Ltd., SANKYO YUKA KOGYO K.K., ENEOS Corporation, Olisoy, H&R Group, HOKOKU CORPORATION, Fuji Kosan Company, Ltd., and Nisshin OilliO Group, Ltd.(ii) Liquid rubberThe liquid rubber is a polymer in a liquid state at normal temperature (25° C.), and is a rubber component that can be extracted from a vulcanized tire by extraction with acetone. Examples of the liquid rubber include a farnesene-based polymer, a diene-based liquid polymer, and a hydrogenated substance thereof.The farnesene-based polymer is a polymer obtained by polymerizing farnesene, and has a farnesene-based constitutional unit. With respect to farnesene, there are isomers such as α-farnesene ((3E,7E)-3,7,11-trimethyl-1,3,6,10-dodecatetraene) and β-farnesene (7,11-dimethyl-3-methylene-1,6,10-dodecatriene).The farnesene-based polymer may be a homopolymer of farnesene (a farnesene homopolymer) or a copolymer of farnesene and a vinyl monomer (a farnesene-vinyl monomer copolymer).Examples of the diene-based liquid polymer include a liquid styrene-butadiene copolymer (liquid SBR), a liquid butadiene polymer (liquid BR), a liquid isoprene polymer (liquid IR), and a liquid styrene-isoprene copolymer (liquid SIR).In the diene-based liquid polymer, the polystyrene is equivalent weight average molecular weight (Mw) measured by gel permeation chromatography (GPC), for example, more than 1.0×10 3 and less than 2.0×10 5. Here, Mw of the diene-based liquid polymer is a polystyrene equivalent value measured by gel permeation chromatography (GPC).As the liquid rubber, it is possible to use a product manufactured by, for example, Kuraray Co., Ltd. or Cray Valley.(iii) Resin componentThe resin component also functions as an adhesion promoting component and may be a solid or a liquid at normal temperature. Specific examples of the resin component include resins such as a rosin-based resin, a styrene-based resin, a coumarone-based resin, a terpene-based resin, a C5 resin, a C9 resin, a C5C9 resin, and an acrylic resin, and two or more kinds thereof may be used in combination. Note that the resin components may be provided with a modifying group capable of reacting with silica or the like, as required.The rosin-based resin is a resin containing, as a main component, rosin acid obtained by processing pine resin. The rosin-based resin (rosin) may be classified according to the presence or absence of modification, and it may be classified into an unmodified rosin (unmodified rosin) and a rosin-modified product (rosin derivative). Examples of the unmodified rosin include tall rosin (also known as tall oil rosin), balsam rosin, wood rosin, disproportionated rosin, polymerized rosin, hydrogenated rosin, and other chemically modified rosin. The rosin modified product is a modified product of the unmodified rosin, examples of which include rosin esters, unsaturated carboxylic acid modified rosin, unsaturated carboxylic acid modified rosin esters, amide compounds of rosin, and amine salts of rosin.The styrene-based resin is a polymer using a styrene-based monomer as a constituent monomer, and examples thereof include a polymer obtained by performing polymerization using the styrene-based monomer as a main component (50% by mass or more). Specific examples thereof include a homopolymer obtained by subjecting each of styrene-based monomers (styrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, α-methylstyrene, p-methoxystyrene, p-tert-butylstyrene, p-phenylstyrene, o-chlorostyrene, m-chlorostyrene, p-chlorostyrene, and the like) to homopolymerization, and a copolymer obtained by copolymerizing two or more styrene-based monomers, and a copolymer of a styrene-based monomer and another monomer capable of copolymerization with the styrene-based monomer.Examples of the other monomer include acrylonitriles such as acrylonitrile and methacrylonitrile; unsaturated carboxylic acids such as acrylic and methacrylic acid; unsaturated carboxylic acid esters such as methyl acrylate and methyl methacrylate; dienes such as chloroprene, butadiene and isoprene; olefins such as 1-butene and 1-pentene; and α,β-unsaturated carboxylic acids such as maleic anhydride or acid anhydrides thereof.Among coumarone-based resins, a coumarone-indene resin is preferred. The coumarone-indene resin is a resin containing coumarone and indene as monomer components constituting the skeleton (main chain) of the resin. Examples of the monomer component other than the coumarone and the indene contained in the skeleton include styrene, α-methylstyrene, methylindene and vinyltoluene.The hydroxyl group value (OH value) of the cumarone-indene resin is, for example, more than 15 mgKOH / g and less than 150 mgKOH / g. Note that the OH value is a value obtained by expressing the amount of potassium hydroxide required to neutralize the acetic acid bonded to the hydroxyl group with respect to milligrams in a case where 1 g of the resin is acetylated, and is a value measured according to a potentiometric method (JIS K 0070: 1992).The softening point of the cumarone-indene resin is, for example, higher than 30° C. and lower than 160° C. Note that the softening point is a temperature at which a ball falls in a case where the softening point specified in JIS K 6220- 1: 2001 is measured with a ring-and-ball type softening point measurement device.Examples of the terpene-based resin include polyterpene, terpene phenol, and an aromatic modified terpene resin. Polyterpene is a resin obtained by polymerizing a terpene compound and a hydrogenated substance thereof. The terpene compound is a hydrocarbon having a composition of (C 5 H 8)n and an oxygen-containing derivative thereof, and is a compound having, as a basic skeleton, a terpene classified into a monoterpene (C 10 H 16), a sesquiterpene (C 15 H 24) or a diterpene (C 20 H 32). Examples thereof include α-pinene, β-pinene, dipentene, limonene, myrcene, alloocimeene, osimeene, α-phellandrene, α-terpines, γ-terpines, terpineols, 1,8-cineol, 1,4-cineol, α-terpineol, β-terpineol, and γ-terpineol.Examples of the polyterpene also include terpene resins such as an α-pinene resin, a β-pinene resin, a limonene resin, a dipentene resin, and a β-pinene / limonene resin, for which the above-described terpene compounds are respectively used as raw materials, and hydrogenated terpene resins obtained by subjecting the terpene resins to hydrogenation treatment, respectively. Examples of the terpene phenol include a resin obtained by copolymerizing the above-described terpene compound and a phenol-based compound, and a resin obtained by subjecting the resin to hydrogenation treatment. Specific examples thereof include a resin obtained by condensing the terpene compound described above, a phenol-based compound, and formalin. Note that examples of the phenol-based compound include phenol, bisphenol A, cresol, and xylenol. Examples of the aromatic modified terpene resin include a resin obtained by modifying a terpene resin with an aromatic compound and a resin obtained by subjecting the resin to hydrogenation treatment. Note that the aromatic compound is not particularly limited as long as it is a compound having an aromatic ring. Examples thereof, however, include a phenol compound such as phenol, an alkylphenol, an alkoxyphenol, or a phenol containing unsaturated hydrocarbon group; a naphthol compound such as naphthol, an alkylnaphthol, an alkoxynaphthol, or a naphthol containing unsaturated hydrocarbon group; a styrene derivative such as styrene, an alkylstyrene, an alkoxystyrene, and a styrene containing unsaturated hydrocarbon group; and cumarone and indene.The term "C5 resin" refers to a resin obtained by polymerizing a C5 fraction. Examples of the C5fraction include petroleum fractions equivalent to those having 4 to 5 carbon atoms, such as cyclopentadiene, pentene, pentadiene and isoprene. As the C5-based petroleum resin, a dicyclopentadiene (DCPD) resin is suitably used.The term "C9 resin" refers to a resin obtained by polymerizing a C9 fraction, and may be a resin obtained by hydrogenating or modifying the obtained resin. Examples of the C9fraction include petroleum fractions equivalent to those having 8 to 10 carbon atoms, such as vinyltoluene, alkylstyrene, indene and methylindene. As a specific example thereof, a coumarone-indene resin, a coumarone resin, an indene resin, and an aromatic vinyl-based resin are suitably used. The aromatic vinyl-based resin is preferably a homopolymer of α-methylstyrene (AMS resin) or styrene or a copolymer of α-methylstyrene and styrene, and more preferably a copolymer of α-methylstyrene and styrene, because of the reason that it is economical, easy to process, and excellent in exothermicity. As the aromatic vinyl-based resin, it is possible to use those commercially available from, for example, Kraton Corporation and Eastman Chemical Company.The term "C5C9 resin" refers to a resin obtained by copolymerizing the C5 fraction and the C9 fraction, and may be a resin obtained by hydrogenating or modifying the obtained resin. Examples of the C5fraction and the C9fraction include the petroleum fraction described above. As the C5C9 resin, it is possible to use those commercially available from, for example, Tosoh Corporation and Shandong Luhua Group Co., Ltd.The acrylic resin is not particularly limited, but for example, a solvent-free acrylic resin may be used.Examples of the solvent-free acrylic resin include a (meth)acrylic resin (polymer) obtained according to a continuous high-temperature polymerization method (continuous high-temperature bulk polymerization method) (the method described in U.S. Pat. No. 4414370, Japanese Unexamined Patent Publication No. S59-6207, Japanese Examined Patent Publication No. H 5-5805, Japanese Unexamined Patent Publication No. H 1-313522, U.S. Patent No. 5010166, TOAGOSEI Annual Research Report, TREND 2000 No. 3, pp. 42-45 or the like) without using, as far as possible, a polymerization initiator, a chain transfer agent, an organic solvent and the like, which are auxiliary raw materials. Note that in the present invention, (meth)acrylic means methacrylic and acrylic.Examples of the monomer component constituting the acrylic resin include (meth)acrylic acid, a (meth)acrylic acid ester (alkyl ester, aryl ester, aralkyl ester or the like), (meth)acrylamide, and a (meth)acrylic acid derivative such as a (meth)acrylamide derivative.Moreover, as the monomer component constituting the acrylic resin, an aromatic vinyl such as styrene, α-methylstyrene, vinyltoluene, vinylnaphthalene, divinylbenzene, trivinylbenzene or divinylnaphthalene may be used together with (meth)acrylic acid or a (meth)acrylic acid derivative.The acrylic resin may be a resin composed of only a (meth)acrylic component, or may be a resin also having a component other than the (meth)acrylic component as a component thereof. Moreover, the acrylic resin may have a hydroxyl group, a carboxyl group, a silanol group, or the like.As the resin component, it is possible to use a product manufactured by, for example, Maruzen Petrochemical CO., LTD., Sumitomo Bakelite Co., Ltd., Yasuhara Chemical Co., Ltd., Tosoh Corporation, Rutgers Chemicals AG, BASF SE, Kraton Corporation, NITTO CHEMICAL CO., LTD., Nippon Shokubai Co., Ltd., ENEOS Corporation, Arakawa Chemical Industries, Ltd., or Taoka Chemical Co., Ltd.(6) WaxThe rubber composition generally contains wax, and the wax is not particularly limited. Any wax normally used in the tire industry may be suitably used. Examples thereof include a mineral-based wax and a plant-based wax. The mineral-based wax refers to a wax derived from a mineral resource such as oil or natural gas. The wax derived from plants refers to a wax derived from natural resource such as plant. Among them, a mineral-based wax is preferable.Examples of the vegetable-derived wax include rice wax, carnauba wax and candelilla wax. Examples of the petroleum-based wax include a paraffin wax, a microcrystalline wax, and a special wax selected thoroughly, and a paraffin wax is preferred. It is noted in the present invention that the wax does not contain stearic acid.Note that, as the wax, a wax commercially available from, for example, OUCHI SHINKO CHEMICAL INDUSTRIAL CO., LTD., NIPPON SEIRO Co., Ltd., or Paramelt B.V. may be used. These waxes may be used alone, or two or more of them may be used in combination.(7) AntioxidantThe rubber composition generally contains an antioxidant. The antioxidant is not particularly limited. However, examples thereof include a naphthylamine-based antioxidant such as phenyl-α-naphthylamine; a diphenylamine-based antioxidant such as octylated diphenylamine or 4,4'-bis(α,α'dimethylbenzyl)diphenylamine; a p-phenylenediamine-based antioxidant such as N-isopropyl-N'phenyl-p-phenylenediamine, N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine (6PP), N,N'-bis(1,4-dimethylpentyl)-p-phenylenediamine (77PD), N,N'-diphenyl-p-phenylenediamine (DPPD), N,N'-ditolyl-p-phenylenediamine (DTPD), N-isopropyl-N'-phenyl-p-phenylenediamine (IPPD) or N,N'-di-2-naphthylp-phenylenediamine (DNPD); a quinoline-based antioxidant such as a polymer of 2,2,4-trimethyl-1,2-dihydroquinoline; a monophenol-based antioxidant such as 2,6-di-t-butyl-4-methylphenol or styrenated phenol; a bis-, tris- or polyphenol-based antioxidant such as tetrakis[methylene-3-(3',5'-di-t-butyl4'-hydroxyphenyl)propionate]methane. Among the above, a p-phenylenediamine-based antioxidant or a quinoline-based antioxidant is preferable, and a polymer of N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine and 2,2,4-trimethyl-1,2-dihydroquinoline is more preferable. These may be used alone, or two or more kinds thereof may be used in combination. As a commercially available product thereof, it is possible to use a product manufactured by, for example, Seiko Chemical Co., Ltd., Sumitomo Chemical Co., Ltd., OUCHI SHINKO CHEMICAL INDUSTRIAL CO., LTD., or FLEXSYS.Note that, in the rubber composition, among the respective materials described above, various materials (for example, a rubber, oil, a resin, a vulcanization accelerator, an antioxidant, and a surfactant) containing a carbon atom may be derived from carbon dioxide in the air. With respect to a method for obtaining a mixture according to the present invention from carbon dioxide, carbon dioxide may be subjected to direct conversion, or methane obtained by a methanizing process of synthesizing methane from carbon dioxide may be converted.3. Production of TiresThe tire according to the present embodiment can be manufactured by a typical method.Specifically, an inner liner portion as a member for securing the airtightness holding property of the tire, a carcass portion as a member that resists the load, the impact, and the inflation air pressure applied to the tire, a belt portion as a member that tightly clamps the carcass and increases the rigidity of the tread, and the like are wound on a forming drum, and a bead portion as a member for fixing the tire to the rim while fixing both ends of the carcass ply to edge parts on both sides is arranged to be formed into a toroidal shape. Then, the tread portion is bonded to a center part of an outer periphery, and the sidewall is bonded to an outer side in the radial direction to form a side part, thereby producing an unvulcanized tire.Thereafter, the unvulcanized tire produced as described above is subjected to heating and pressurization in a vulcanizing machine to obtain a tire. The vulcanization process can be performed by using a publicly known vulcanizing agent. A vulcanization temperature is, for example, higher than 120° C. and lower than 200° C., and a vulcanization time is, for example, more than 5 minutes and less than 15 minutes.As described above, since the carcass portion and the belt portion are formed suitably in the tire obtained as described above, the respective effects cooperate to be shown synergistically. Therefore, the steering stability can be improved, and the low fuel consumption of the tire can also be improved.Moreover, the tire according to the present invention can be suitably used as a tire for a passenger car, a tire for a large passenger car, a tire for a large SUV, a tire for a small truck, or the like.[Examples]Examples (examples) that are considered preferable in carrying out the present embodiment are shown below; however, the scope of the present invention is not limited to these examples.Tires having a configuration shown in FIG. 1 (tire size: 195 / 65R15) are examined, the tires except for the carcass ply and the belt of each specification shown in Table 1 and Table 2 being substantially the same, and the results of steering stability and low fuel consumption properties calculated based on the evaluation method described later are shown together in the lower parts of Table 1 and Table 2.1. Evaluation of steering stabilityA test driver drives a vehicle (an inland FR vehicle having a displacement of 2,000 cc) in which the respective test tires are mounted on all wheels, and the vehicle is subjected to running a test distance of dry asphalt at a speed of 100 km / h. Then, each of 20 test drivers performs sensory evaluation of steering stability during driving based on characteristics such as steering wheel reaction, rigidity feeling, and grip, and gives the steering stability 1 to 10 points (the larger the numerical value, the more positive), and the total points are calculated.Next, the result in Comparative Example 1 is set to 100, and the evaluation of steering stability is performed by performing indexing based on the following expression. A larger numerical value further indicates excellent steering stability.2. Evaluation of Low Fuel Consumption PropertiesUsing a rolling resistance testing machine, a rolling resistance coefficient (RRC) in a case where each test tire is subjected to running on a drum at a speed of 80 km / h under the following conditions is measured as an index for evaluating low fuel consumption properties.Rim to be used: 15×6 JInternal pressure: 210 kPaLoad: 4.35 kNNext, the result in Comparative Example 1 is set to 100, and evaluation of low fuel consumption properties is performed by performing indexing based on the following expression. It indicates that the larger the numerical value, the better the low fuel consumption properties.(3) Total Power TotalThe total power is represented by a sum of the index of steering stability and the index of low fuel consumption properties described above. [Table 1] Table 1] [Table 1] Table 1](Belt)Configuration1 × 42 + 22 + 21 × 4Number of filaments (filaments)4444Filament diameter (mm)0,220, 230, 230,27Cord diameter BR (mm)0, 520,590,590, 65Ends E BC ( Cords)46303032Distance Bg (mm) between belts0,550,660,660,55(Carcass Ply)Linear density (dtex)6600440066004400Cord diameter Pr (mm)0, 960,780, 960,78Ends E CA ( Cords)30503050Average degree of stretching (%)4, 84, 84, 84, 8Heat shrinkage rate (%)4,54,54,54,5(Parameters)(BR + Bg) / Pr1,1151,6031,3021,538|E CA - E BC|1620018Average Degree of Elongation + Heat Shrinkage Rate9, 309, 309, 309, 30(Evaluation)Steering stability1009810099Low Fuel Consumption Properties100979799[Table 2][Table 2](Belt)Configuration1 × 41 × 41 × 41 × 41 × 4Number of filaments (filaments)44444Filament diameter (mm)0, 160,220,220,220,22Cord diameter BR (mm)0,410,520,520,520,52Ends E BC ( Cords)6046464040Distance Bg (mm) between belts0,540,430,430,30, 3(Carcass Ply)Linear density (dtex)66006600660066006600Cord diameter Pr (mm)0,960, 960, 960, 960, 96Ends E CA ( Cords)3030404040Average degree of stretching (%)4, 84, 84, 84, 84, 3Heat shrinkage rate (%)4,54,54,54,53(Parameters)(BR + Bg) / Pr0,9900,9900,9900,8540, 854|E CA - E BC|3016600Average Degree of Elongation + Heat Shrinkage Rate9, 309, 309, 309, 307,30(Evaluation)Steering stability107111113117119Low Fuel Consumption Properties100100100102102The present invention has been described above based on the embodiments. However, the present invention is not limited to the above-described embodiments. Various changes can be made to the above-described embodiments within the same and same ranges as those of the present invention.The present invention (1) is a tire characterized by comprising:a carcass portion; anda belt portion,wherein a carcass ply constituting the carcass portion is a carcass ply formed from a ply cord having a line density of more than 4,400 dtex,the belt portion is formed by superimposing at least two or more layers that are belt layers formed of a belt cord having a structure in which four filaments are twisted easily, anda diameter Pr (mm) of the ply cord, a diameter Br (mm) of the belt cord, and a tire radial distance Bg (mm) between the belt cords in adjacent belt layers satisfy the following expression:The present invention (2) is the tire according to the present invention (1) characterized in that the carcass portion is constructed of a single layer of a carcass ply.The present invention (3) is the tire according to the present invention (1) or the present invention (2), which is characterized in that a cord diameter of the belt cord is 0.42 mm or more and 0.56 mm or less.The present invention (4) is the tire according to any combination of the present inventions (1) to (3), characterized in that in a tire width direction, the number of cords E CA( cords) per 50 mm in width at the carcass portion and the number of cords E BE( cords) per 50 mm in width at the belt portion satisfy the following expression:The present invention (5) is the tire according to any combination of the present inventions (1) to (4), characterized in that the number of cords E BE per 50 mm in width at the belt portion in a tire width direction is 45 or less.The present invention (6) is the tire according to any combination of the present inventions (1) to (5), characterized in that a sum of an average elongation degree (%) and a heat shrinkage rate (%) of the ply cord is less than 8.3.List of reference characters1 Tire 2 Tread portion 3 Sidewall portion 4 Bead portion 5 Bead core 6 Carcass portion 6A Carcass ply 6 a Innerer main body portion 6 b Äußerer folded portion 7 Belt portion 7A First belt 7B Second belt 8 Bead apex rubber C Center lineReferences included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedJP 2005-239069

[0003] JP 2009-2594

[0072] US 4414370

[0114] JP 59-6207

[0114] JP 5-5805

[0114] JP 1-313522

[0114] US 5010166

[0114] Cited Non-Patent LiteratureJIS L1017:2002 [0013, 0026, 0034, 0035]JIS G 3510:1992

[0022] JIS K 6316:2017

[0065] JIS K 6220-1: 2001

[0107]

Claims

A tire comprising: a carcass portion; and a belt portion, wherein a carcass ply constituting the carcass portion is a carcass ply formed of a ply cord having a line density of more than 4,400 dtex, the belt portion is formed by superimposing at least two or more layers being belt layers formed of a belt cord having a structure in which four filaments are singly twisted, and a diameter Pr (mm) of the ply cord, a diameter Br (mm) of the belt cord, and a tire radial distance Bg (mm) between the belt cords in adjacent belt layers satisfy the following expression: (Br + Bg) / Pr ≤ 1.

00. The tire according to claim 1, wherein the carcass portion is constructed of a single layer of a carcass ply.The tire according to claim 1 or 2, wherein a cord diameter of the belt cord is 0.42 mm or more and 0.56 mm or less.The tire according to any one of claims 1 to 3, wherein in a tire width direction, the number of cords E CA( cords) per 50 mm in width at the carcass portion and the number of cords E BE( cords) per 50 mm in width at the belt portion satisfy the following expression: | E CA - E BE | ≦ 15. The tire according to any one of claims 1 to 4, wherein the number of cords E BE per 50 mm in width at the belt portion in a tire width direction is 45 or less.The tire according to any one of claims 1 to 5, wherein a sum of an average degree of elongation (%) and a heat shrinkage rate (%) of the ply cord is less than 8.3.

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