Method for manufacturing a pneumatic tire

Abstract

Method for manufacturing a pneumatic tire (1) which arranges a belt cover layer (15) on an outer surface of a belt layer (14) in the tire radial direction by spirally winding a strip-shaped belt cover material (40) around a tire axis of rotation, the method comprising: a step of using a first cover material (41) and a second cover material (42) in the belt cover material (40) and, wherein one side in a tire width direction with respect to an equatorial plane of the tire (1) is defined as a first side and another side in the tire width direction with respect to the equatorial plane of the tire (1) is defined as a second side, spirally winding the first cover material (41) from a position between a shoulder region on the second side and the equatorial plane of the tire (1) to a shoulder region on the first side;a step of spirally winding the second cover material (42) from a position between the shoulder area on the first side and the equatorial plane of the tire (1) to the shoulder area on the second side; a step of spirally winding the first cover material (41) from the shoulder area on the first side to the equatorial plane of the tire; and a step of spirally winding the second cover material (42) from the shoulder area on the second side to the equatorial plane of the tire (1), wherein the first cover material (41) and the second cover material (42) as well as the first cover materials (41) and the second cover materials (42) are layered in the tire radial direction in a region between a section of the first cover material (41) located on the second side and a section of the second cover material (42) located on the first side, thereby forming an overlap section (45).

Description

Technical field

[0001] The present invention relates to a method for manufacturing a pneumatic tire. State of the art

[0002] Some prior art pneumatic tires achieve a desired performance by incorporating a component arranged on the outer side of a belt layer in a tire radial direction. For example, a pneumatic tire described in patent document 1 improves the protrusion resistance by having two belt protection layers arranged on the outer side of a belt layer in a tire radial direction, and the belt protection layer on the outer side in the tire radial direction having a narrower width than the belt protection layer on the inner side in the tire radial direction.In a pneumatic tire described in patent document 2, a belt reinforcement layer is arranged between a tread section and a belt layer, and the belt reinforcement layer is configured such that there are three layers on a tire equator section to ensure braking energy while suppressing weight gain.

[0003] A pneumatic tire described in patent document 3 comprises a strip-shaped sound-absorbing element that adheres to an inner surface of the tire in a tread section, a solid top layer arranged on the outer circumference of a belt layer, and a middle top layer arranged on the outer circumference of the solid top layer, locally covering a central region of the tire's width. By defining the respective widths of the strip-shaped sound-absorbing element and the belt layer, and the widths of the middle top layer and the strip-shaped sound-absorbing element, a decrease in durability at high speeds caused by heat buildup in the strip-shaped sound-absorbing element is reduced, while sufficient noise reduction is maintained by the strip-shaped sound-absorbing element.

[0004] In a pneumatic tire described in patent document 4, a belt cover layer, formed by an end-section belt cover layer and a middle-section belt cover layer, is arranged outside a belt layer. The tensile strength of organic fiber cord threads forming the end-section belt cover layer and the middle-section belt cover layer, and the sum of the end-section belt cover layer and the middle-section belt cover layer, are defined such that a reduction in road noise in a high-frequency band and a reduction in weight are ensured. Furthermore, a pneumatic tire described in patent document 5 has a belt cover formed by spirally winding a strip material onto an outer circumferential side of a belt layer.In the belt cover, the overlapping wrapping of the strip material at a position that covers an end section in a tire width direction in the belt layer, and at a position that covers a middle section in the tire width direction in the belt layer, improves steering stability and durability. List of oppositions patent literature Patent document 1: JP 4865259 B Patent Document 2: JP 2010-64644 A Patent Document 3: JP 2017-137032 A Patent document 4: JP 4635366 B Patent Document 5: JP 4687201 B Brief description of the invention: Technical problem

[0005] For example, among pneumatic tires, there are those that can bear a high load, such as a standard tire with an additional load rating. These tires can be used to handle heavy loads at relatively high inflation pressures. Meanwhile, as the tire's inflation pressure increases, the stiffness of a tread section also increases. Consequently, this tread section is less likely to deform when encountering a foreign object, and impact bursting caused by the impact is more likely to occur. In other words, using a pneumatic tire at high inflation pressure likely reduces its impact bursting performance, meaning its resistance to impact bursting.

[0006] Impact bursting is likely to occur when a foreign object on a road surface is driven over in an area at or near the equatorial plane of the tire on a road contact surface of the tread section. Accordingly, reinforcement at or near the equatorial plane of the tire in the tread section is effective in improving impact burst resistance performance. However, the new addition of a reinforcing element extends the manufacturing process by this dimension, thereby reducing productivity. For this reason, achieving both impact burst resistance performance and productivity in a compatible manner was extremely difficult.

[0007] The present invention was developed in view of the above problems, and one object of it is to provide a method for manufacturing a pneumatic tire that is able to achieve both impact burst resistance performance and productivity in a compatible manner. Solution to the problem

[0008] To solve the problems described above and to fulfill the objective, a method for manufacturing a pneumatic tire according to the present invention is a method for manufacturing a pneumatic tire that arranges a belt cover layer on an outer surface of a belt layer in the tire radial direction by winding a strip-shaped belt cover material spirally around a tire axis of rotation, wherein the method includes: a step of using a first cover material and a second cover material in the belt cover material, wherein one side in the tire width direction with respect to an equatorial plane of the tire is defined as a first side and another side in the tire width direction with respect to the equatorial plane of the tire is defined as a second side.spiral winding of the first cover material from a position between a shoulder area on the second side and the equatorial plane of the tire to a shoulder area on the first side; one step of spiral winding of the second cover material from a position between the shoulder area on the first side and the equatorial plane of the tire to the shoulder area on the second side; one step of spiral winding of the first cover material from the shoulder area on the first side to the equatorial plane of the tire; and one step of spiral winding of the second cover material from the shoulder area on the second side to the equatorial plane of the tire, wherein the first cover material and the second cover material, as well as the first cover materials and the second cover materials, are layered in the tire radial direction, in an area between a section of the first cover material located on the second side,and a section of the second cover material located on the first side, thus forming an overlap section.

[0009] In the above-described method for manufacturing a pneumatic tire, the winding of the first cover material and the winding of the second cover material are preferably started simultaneously.

[0010] In the above-described method for manufacturing a pneumatic tire, the overlap section preferably has a width in the tire width direction within a range of 5 mm or more and 40 mm or less. Advantageous effects of the invention

[0011] The method for manufacturing a pneumatic tire according to embodiments of the present invention can achieve the effect of both impact burst strength performance and productivity in a compatible manner. List of characters Fig. Figure 1 is a meridian cross-sectional view illustrating a main section of an air tire according to one embodiment. Fig. 2 is a detailed view of a Fig. 1 illustrated tread section. Fig. Figure 3 is a schematic view illustrating the environments of inner end sections of a first decking material and a second decking material of a belt decking layer, with the schematic view extending along a direction of arrow AA from Fig. 2 is carried out. Fig. Figure 4 is a schematic view illustrating the arrangement positions of the first and second decking materials, as shown in Fig. 3 are illustrated. Fig. 5 is a detailed view of a Fig. 2 illustrated middle bridge section. Fig. Figure 6 is a schematic view to illustrate the directions in which a first cover material and a second cover material are wound. Fig. Figure 7 is an explanatory diagram illustrating a condition in which a protrusion on a road surface is driven over by the pneumatic tire according to one embodiment. Fig. Figure 8 is a table showing the results of performance evaluation tests on processes for manufacturing pneumatic tires. Description of embodiments

[0012] Embodiments of a method for manufacturing a pneumatic tire according to the present invention are described in detail below with reference to the drawings. However, the present invention is not limited to these embodiments. Components of the following embodiment include elements that are essentially identical or that can be substituted or easily devised by a person skilled in the art. [Types] Pneumatic tires

[0013] In the following description, the term "tire radial direction" refers to a direction perpendicular to the tire's axis of rotation (not illustrated), which is the axis of rotation of a pneumatic tire. 1The term "inside in the tire radial direction" refers to a side in the direction of the tire's axis of rotation in the tire radial direction, and the term "outside in the tire radial direction" refers to a side away from the tire's axis of rotation in the tire radial direction. The term "tire circumferential direction" refers to a circumferential direction with the tire's axis of rotation as its central axis. Furthermore, the term "tire width direction" refers to a direction parallel to the tire's axis of rotation. The term "inside in the tire width direction" refers to a side perpendicular to the tire's equatorial plane (tire equator line) CL in the tire width direction, and the term "outside in the tire width direction" refers to an equatorial plane CL of the tire in the tire width direction. The term "equatorial plane of the tire CL" refers to a plane perpendicular to the tire's axis of rotation and passing through the center of the tire's width. 1The equatorial plane of the tire CL is aligned at a position in the tire width direction on the centerline in the tire width direction, which corresponds to the center position of the pneumatic tire. 1 in the tire width direction. The tire width is the width in the tire width direction between sections located at the outermost edges in the tire width direction, or in other words, the distance between the sections furthest from the tire's equatorial plane CL in the tire width direction. The term "tire equator line" refers to a line in the circumferential direction of the pneumatic tire. 1 , which lies on the equatorial plane of tire CL.

[0014] Fig. Figure 1 is a meridian cross-sectional view showing a main section of the pneumatic tire. 1 as illustrated in the embodiment. The pneumatic tire 1 According to the present embodiment, the pneumatic tire1 , which can be used under high loads, like the pneumatic tire 1 with standard ADDITIONAL LOAD. For pneumatic tires 1 According to the present embodiment, a running surface section 2 when viewed in a meridian cross-section on a section on the outermost side in the tire radial direction, and the tread section 2 includes a tread rubber layer 4 One that is made from a rubber compound. A surface of the tread section. 2 , that is, a section in contact with a road surface while a vehicle is in motion (not illustrated), where the pneumatic tires 1 are mounted, is considered a ground contact surface 3 formed, and the ground contact surface 3 forms part of the contour of the pneumatic tire 1 A plurality of main grooves 30, which extend in the circumferential direction of the tire, are in the ground contact surface 3 in the tread section 2 trained, and a plurality of bridge sections 20 are characterized by the majority of main grooves 30 on the surface of the tread section 2 defined. In this embodiment, four main grooves are defined in the tire width direction. 30 formed side by side and each of the four main grooves 30 are arranged on both sides in the tire width direction of the tire's equatorial plane CL. In other words, the four main grooves are 30 in the tread section 2 formed, including: two central main grooves 31 arranged on both sides of the equatorial plane of the tire CL; and two shoulder main grooves 32 arranged on an outer side in the tire width direction of each of the two central main grooves 31.

[0015] Note that "Main groove 30" refers to a vertical groove where at least part of it extends in the tire's circumferential direction. Generally, the main groove has... 30 It has a groove width of 3 mm or more and a groove depth of 6 mm or more and features a tread wear indicator (slip mark) within it that shows the end stages of wear. In the present embodiment, the main groove has 30 a groove width in a range of 6 mm or more and 25 mm or less and a groove depth in a range of 6 mm or more and 9 mm or less and is essentially parallel to a tire equator line (center line) where the equatorial plane of the tire CL and the ground contact surface 3 cut. The main grooves 30 They can extend linearly in the direction of the tire's circumference or can be provided in a wave or zigzag shape.

[0016] From the bridge sections 20 , which are through the main grooves 30 are defined, the bridge section 20 , which is positioned between the two central main grooves 31 and on the equatorial plane of the tire CL, a central rib section 21. Furthermore, the rib sections are 20 , which are positioned between the adjacent central main grooves 31 and shoulder main grooves 32 and are arranged on the outer side of the central rib section 21 in the tire width direction, second rib sections 22. Furthermore, the rib sections 20 , which are positioned on the outer side of the second rib sections 22 in the direction of the tire width and adjacent to the second rib sections 22 with the shoulder main grooves 32 arranged between them, shoulder rib sections 23.

[0017] Note that the bridge sections 20may be rib-shaped over a circumference in the tire's circumferential direction and may contain a plurality of lug grooves (not illustrated) extending in the tire's width direction in the tread section 2 can be formed. Thus, the bridge sections can 20 through the main grooves 30 and the cleat grooves be defined and each of the bridge sections 20 can be formed in a block shape. In this embodiment, the web section 20 as a rib-like bridge section 20 formed, which is formed around the circumference of the tire in the circumferential direction.

[0018] Shoulder sections 5 are located at both ends on the outer sides of the tread section in the direction of tire width. 2 arranged and side wall sections 8 are on the inner sides of the shoulder sections in the tire radial direction 5arranged. In other words, the shoulder sections are 8 in the tire width direction of the tread section 2 arranged on both sides. In other words, the side wall sections are 8 in the tire width direction of the pneumatic tire 1 arranged in two areas on both sides and form sections that extend to the outermost sides of the pneumatic tire in the direction of tire width. 1 are exposed.

[0019] A bead section 10 is located on an inner side (in the radial direction of the tire) of each of the sidewall sections 8 , located on both sides in the direction of tire width. Similar to the sidewall sections. 8 are the bead sections 10 arranged on both sides of the tire's equatorial plane CL. That is, a pair of bead sections. 10is arranged on both sides in the tire width direction of the tire's equatorial plane CL. Each bead section 10 The bead core 11 is provided with a bead core, and a bead filler 12 is provided on the outer side of the bead core 11 in the tire radial direction. The bead core 11 is an annular member formed by bundling tire bead wires, which are steel wires, in an annular shape, and the bead filler 12 is a rubber member arranged on the outer side of the bead core 11 in the tire radial direction.

[0020] A belt layer 14 is in the tread section 2 arranged. The belt layer 14 is formed by a multilayer structure in which a plurality of belts 141, 142 are layered, and the two layers of the belts 141, 142 are layered in the present embodiment. The belts 141, 142, which form the belt layer 14The belts are formed by rolling and coating a plurality of belt cord threads made of steel or an organic fiber material, such as polyester, rayon, or nylon, with coating rubber, and a belt angle, defined as the inclination angle of the belt cord threads with respect to the tire's circumferential direction, lies within a predetermined range (for example, 20° or more and 55° or less). Furthermore, the belt angles of the two layers of belts 141 and 142 differ from each other. Accordingly, the belt layer 14configured as a so-called cross-layer structure, in which the two layers of belts 141 and 142 are stacked, with the inclination directions of the belt cord threads intersecting each other. In other words, the two layers of belts 141 and 142 are designed as so-called cross belts, in which the belt cord threads provided with the respective belts 141 and 142 are arranged in intersecting orientations.

[0021] A belt top layer 15 is on an outer side of the belt layer in the tire radial direction 14 arranged. The belt cover layer 15 is on the outer side of the belt layer in the tire radial direction 14 arranged, covers the belt layer 14 in the tire's circumferential direction and is provided as a reinforcement layer that protects the belt layer 14 reinforced. The belt cover layer 15The belt is formed by covering a plurality of cord threads (not illustrated), which are arranged side by side in the transverse direction of the tire and essentially parallel to the circumferential direction, with coating rubber. The belt cover layer 15 The provided cord threads consist, for example, of steel or an organic fiber such as polyester, polyethylene terephthalate, rayon, nylon, and a hybrid of a polyamide composite + α, and the cord thread angle is within a range of ± 5° with respect to the tire's circumferential direction. Furthermore, the belt cover layer... 15 The provided cord threads have a wire diameter, which is a diameter of the cord thread, in the range of 0.5 mm or more and 1.8 mm or less, and a cord thread count per 50 mm in one arrangement direction of the cord threads is in the range of 30 or more and 80 or less. In the present embodiment, the belt cover layer 15arranged across the entire area in the tire width direction where the belt layer 14 is arranged and covers end sections in the tire width direction of the belt layer 14 The tread rubber layer 4 , which is connected to the tread section 2 is provided, is on the outer side of the belt cover layer in the tire radial direction. 15 in the tread section 2 arranged.

[0022] A carcass layer 13 , which contains the cord threads of radial layers, is continuous on the inner side of the belt layer in the tire radial direction. 14 and on one side of the side wall section 8 near the equatorial plane of the tire CL is provided. Accordingly, the pneumatic tire 1 According to this embodiment, it is configured as a so-called radial tire. The carcass layer 13exhibits a single-layer structure consisting of one carcass ply or a multi-layer structure consisting of multiple carcass plies and runs between the pair of bead sections 10 , which are arranged on both sides in the transverse direction of the tire in a torus shape to form the frame structure of the tire.

[0023] In particular, the carcass layer 13 arranged so that they are separated from a bead section 10 to the other bulge section 10 from the pair of bead sections 10 , which is located on both sides in the direction of the tire width, is stretched and bends on the outer side in the direction of the tire width along the bead cores 11 at the bead sections 10such that it wraps around the bead cores 11 and the bead filler 12. The bead filler 12 is a rubber element arranged in a space formed on the outer side of the bead core 11 in the tire radial direction when the carcass layer 13 at the bulge section 10 is bent back. Furthermore, the belt layer 14 on the outer side of a section in the radial direction of the tire, which is located in the tread section 2 located in the carcass layer 13 arranged between the pair of bead sections 10 It proceeds. Furthermore, the carcass layer of the carcass layer 13The tire is manufactured by rolling and coating multiple carcass cord threads, made of steel or an organic fiber material such as aramid, nylon, polyester, or rayon, with coating rubber. Multiple carcass cord threads, forming the carcass plies, are arranged side by side at an angle in the tire's circumferential direction, the angle following a meridional direction.

[0024] At the tire bead section 10 is a wheel rim pad rubber 17 on an inner side in the tire radial direction and an outer side in the tire width direction of the bead core 11 and a re-bent section of the carcass layer 13 arranged, wherein the wheel rim padding rubber 17 forms a contact surface of the tire bead section 10 with the rim flange. Additionally, there is an inner core. 16 along the carcass layer 13on the inner side of the carcass layer 13 or on the inner side of the carcass layer 13 in pneumatic tires 1 trained. The inner soul 16 forms an inner tire surface 18 from, which is a surface on the inner side of the pneumatic tire 1 is.

[0025] Fig. 2 is a detailed view of the in Fig. 1 illustrated tread section 2 . Fig. Figure 3 is a schematic view showing the environments of inner end sections. 41a , 42a of a first covering material 41 and a second covering material 42 the belt cover layer 15 illustrated, with the schematic view along a direction of arrow AA from Fig. 2 is carried out. Fig. Figure 4 is a schematic view showing the arrangement positions of the first decking material. 41 and the second covering material 42 illustrates the in Fig. 3 are illustrated. The belt cover layer 15 , which are located on the outer side of the belt layer in the radial direction of the tire 14 is arranged by spirally wrapping belt covering materials 40 , which are strip-shaped links, on the outer side of the belt layer in the tire radial direction 14 formed around the tire's axis of rotation. The belt deck material 40 The strip-shaped link has a width within a range of 5 mm or more and 15 mm or less. The belt cover materials 40 are reinforcement layer components that form the belt cover layer 15 form, and a cord thread that forms the belt cover layer 15 It is formed by coating with a coating rubber.

[0026] The belt decking material 40 includes a first decking material 41 and a second covering material 42 one. The first covering material41 and the second decking material 42 are each formed in a strip shape and each spirally arranged on the outer side of the belt layer 14 wound in the radial direction of the tire. Furthermore, the first cover material 41 and the second decking material 42 Links of an identical type are each formed by coating the cord threads, the belt cover layer. 15 form, formed with coating rubbers. In other words, the first cover material exhibits 41 and the second decking material 42 a configuration in which, for example, widths and thicknesses, wire diameters of the cord threads and spacings of the cord threads and materials of the cord threads and the coating rubbers can be considered identical.

[0027] Furthermore, the arrangement positions of the first decking material are 41 and the second covering material 42arranged in the tire width direction on opposite sides with the equatorial plane of the tire CL as the middle between them, and the first cover material 41 and the second decking material 42 They partially overlap at a position at or near the center in the direction of the tire width. With the first layer of material 41 and the second decking material 42 , in a case where one side is defined as a first side S1 with respect to the equatorial plane of the tire CL in the tire width direction and the other side is defined as a second side S2 with respect to the equatorial plane of the tire CL in the tire width direction, the largest part of the first cover material 41 from the equatorial plane of the tire CL to a shoulder area Ash on the side of the first side S1, and part of the first deck material 41The second side S2 is located near the equatorial plane of tire CL with respect to the equatorial plane of tire CL. Thus, the first cover material 41 from a position between a shoulder area Ash on the second side S2 and the equatorial plane of the tire CL to the shoulder area Ash on the first side S1. Furthermore, most of the second deck material is 42 from the equatorial plane of the tire CL to the shoulder area Ash on the side of the second side S2, and part of the second deck material 42 On the first side S1, the material is positioned close to the equatorial plane of tire CL with respect to the equatorial plane of tire CL. Thus, the second cover material is... 42 arranged from a position between the shoulder area Ash on the first side S1 and the equatorial plane of the tire CL to the shoulder area Ash on the second side S2.

[0028] Note that the shoulder region Ash in this case is a region between a position P, which is 85% of the width of the belt layer. 14 in the tire width direction, and an end section 144 of the belt layer 14 in the tire width direction. In particular, in a tire meridian cross-section, the shoulder region Ash is a region positioned between two shoulder region boundary lines Lsh. The shoulder region boundary lines Lsh are respective lines extending perpendicularly from position P at 85% of the width of a widest belt 143 in the tire width direction, which has the widest width in the tire width direction, of the majority of belts 141, 142 of the belt layer. 14 , and the end section 144 of the widest belt 143 to the inner surface of the tire 18The shoulder areas Ash, as described above, are defined on both sides of the equatorial plane of the tire CL in the tire width direction and are positioned on both sides of the equatorial plane of the tire CL in the tire width direction.

[0029] In this embodiment, of the two layers of belts 141 and 142, which are in the belt layer 14 Included are the width of the belt 141 in the tire width direction, which is located on the inside in the tire radial direction, wider than the width of the other belt 142 in the tire width direction, and the belt 141, which is located on the inside in the tire radial direction, is the widest belt 143.

[0030] Furthermore, positions P at 85% of the width of the widest belt 143 in the tire width direction are positions of end sections of an 85% area, if an area of ​​85% of the width of the widest belt 143 in the tire width direction is evenly distributed on both sides in the tire width direction, with the center of the widest belt 143 in the tire width direction being the center or the position of the equatorial plane of the tire CL serving as the center. Accordingly, distances between positions P at 85% of the width of the widest belt 143 in the tire width direction and the end sections 144 of the widest belt 143 are identical in size between both sides of the equatorial plane of the tire CL in the tire width direction.

[0031] The shoulder region Ash, defined in this way, is defined by its shape in a state where the pneumatic tire 1mounted on a standard rim and inflated to the regular internal pressure. Here, "standard rim" refers to a "standard" Rim” (standard rim) according to the JATMA definition, a “design Rim” (design rim) as defined by the TRA or a “measuring” Rim” (measuring rim) as defined by the ETRTO. Furthermore, a regular internal pressure refers to a “maximum air pressure” as defined by JATMA, the maximum value in “TIRE LOAD LIMITS AT VARIOUS COLD FILLING PRESSURES” as defined by TRA, or “TIRE PRESSURES” as defined by the ETRTO.

[0032] Furthermore, the first decking material 41 and the second decking material 42 each spirally onto the outer side of the belt layer in the tire radial direction 14wound. The direction of the spiral is a direction that is symmetrical when viewed with the equatorial plane of the tire CL as its center. In other words, the first cover material points 41 and the second decking material 42 the same winding direction in the tire's circumferential direction, from the side of the tire's equatorial plane CL to the sides of the shoulder area Ash. In particular, the winding direction of the first cover material 41 in the tire circumferential direction from the side of the tire's equatorial plane CL to the side of the shoulder region Ash on the first side S1, and the winding direction of the second cover material 42 in the direction of the tire circumference from the side of the equatorial plane of the tire CL to the side of the shoulder region Ash on the second side S2 the same direction.

[0033] As described above, the first cover material 41 and the second decking material42 , which form the belt cover layer 15 form, each spirally wound and layered in the radial direction of the tire. In particular, the first cover material closes 41 a basic section 41b and a bent-back section 41c one that is on the outside of the base section 41b arranged in the tire radial direction and in relation to the base section 41b It is layered. From the base section 41b of the bent-back section 41c of the first covering material 41 is the basic section 41b from the position between the shoulder area Ash on the second side S2 and the equatorial plane of the tire CL to the shoulder area Ash on the first side S1. Furthermore, the recurved section 41c from the shoulder area Ash on the first side S1 to the equatorial plane of the tire CL at a position on the outside of the base section 41barranged in the radial direction of the tire.

[0034] The first covering material 41 is formed from a strip-shaped link, so that one end of the first covering material 41 , which is the strip-shaped member, on one of the base section 41b and the bent-back section 41c is positioned, which are layered in the tire radial direction, and the other end on the other side of the base section 41b and the bent-back section 41c is positioned. In particular, it is from both ends of the first decking material. 41 , which is formed from the strip-shaped member, the inner end section 41a , which is the end section that is located on the side of the base section 41b is located between the shoulder area Ash on the second side S2 and the equatorial plane of the tire CL, and an outer end section 41d, which is the end section that is on the side of the bent-back section 41c is positioned on the equatorial plane of tire CL or near the equatorial plane of tire CL.

[0035] The second decking material 42 also includes a basic section 42b and a bent-back section 42c one that is on the outside of the base section 42b arranged in the tire radial direction and in relation to the base section 42b It is layered. From the base section 42b and the bent-back section 42c of the second covering material 42 is the basic section 42b from the position between the shoulder area Ash on the first side S1 and the equatorial plane of the tire CL to the shoulder area Ash on the second side S2. Furthermore, the recurved section 42cfrom the shoulder area Ash on the second side S2 to the equatorial plane of the tire Cl at a position on the outside of the base section 42b arranged in the radial direction of the tire.

[0036] As with the first decking material 41 is also the second decking material 42 formed from a strip-shaped link, so that one end of the second covering material 42 , which is the strip-shaped link, either on the base section 42b or the bent-back section 42c is positioned, which are layered in the tire radial direction, and the other end on the other side of the base section 42b and the bent-back section 42c is positioned. In particular, it is from both ends of the second deck material. 42 , which is formed from the strip-shaped member, the inner end section 42a , which is the end section that is located on the side of the base section 42bis located between the shoulder area Ash on the first side S1 and the equatorial plane of the tire CL, and the outer end section 42d , which is the end section that is on the side of the bent-back section 42c is located on the equatorial plane of tire Cl or near the equatorial plane of tire CL.

[0037] Furthermore, the first decking material 41 and the second decking material 42 an overlap section 45 on which the first decking material 41 and the second decking material 42 overlap in the tire radial direction at a position where positions in the tire width direction are identical.

[0038] Fig. 5 is a detailed view of the in Fig. 2 illustrated middle web section 21. The inner end section 41a, which is the end section that is located on the side of the base section 41b in the first cover material 41 is located on the second side S2, and the inner end section 42a , which is the end section that is located on the side of the base section 42b in the second decking material 42 The section located on the first page, S1, is positioned there. The overlap section 45 is at a position between the inner end section 41a of the first covering material 41 and the inner terminal section 42a of the second covering material 42 formed. Thus, the overlap section is 45 designed in such a way that it runs in the tire width direction over the equatorial plane of the tire CL, and at least part of the overlap section 45 is located on the inner side of the middle web section 21 in the tire radial direction.

[0039] Furthermore, a section of the basic section 41b of the first covering material 41 , which is located on the overlap section 45 is located, and a section of the base section 42b of the second covering material 42 , which is located on the overlap section 45 located, layered in the tire radial direction. In the present embodiment, in the sections of the base section 41b of the first covering material 41 and the base section 42b of the second covering material 42 , which are layered in the tire radial direction, the base section 42b of the second covering material 42 on the outside of the base section 41b of the first covering material 41 layered in the radial direction of the tire.

[0040] The bent-back section 41c of the first covering material 41is arranged from the shoulder area Ash of the first side S1 to the equatorial plane of the tire CL, and the outer end section 41d It ends at the equatorial plane of tire CL. The recurved section 42c of the second covering material 42 is arranged from the shoulder area Ash of the second side S2 to the equatorial plane of the tire CL, and the outer end section 42d It ends at the equatorial plane of tire CL. Since the first cover material 41 and the second decking material 42 Arranged in this way, the two layers of the base section 41b and the bent-back section 41c of the first covering material 41 or the two layers of the base section 42b and the bent-back section 42c of the second covering material 42 wound at a position on the inside of the second rib section 22 or the shoulder rib section 23 in the tire radial direction.

[0041] In contrast, in the section on the inside of the central rib section 21 in the tire radial direction, where the overlap section is located, 45 is the first decking material 41 and the second decking material 42 wound in such a way that they overlap in three layers in the tire's radial direction. In other words, in the section of the overlap section... 45 , which is closer to the first side S1 in relation to the equatorial plane of the tire CL, has a total of three layers, including the two layers of the base section 41b and the bent-back section 41c of the first covering material 41 and the area from the position of the equatorial plane of the tire CL in the base section 42b of the second covering material 42 to the inner end section 42a Furthermore, in the section of the overlap section... 45, which is closer to the second side S2 in relation to the equatorial plane of the tire CL, has a total of three layers, including the two layers of the base section 42b and the bent-back section 42c of the second covering material 42 and the area from the position of the equatorial plane of the tire CL in the base section 41b of the first covering material 41 to the inner end section 41a .

[0042] Thus, the overlap section 45 with three layers of belt covering material 40 in the area in the tire width direction between the position of the inner end section 41a of the first covering material 41 in the tire width direction and the position of the inner end section 42a of the second covering material 42 layered in the direction of tire width, with the area being the area of ​​the overlap section 45Defined in the direction of tire width. The overlap section 45 is a section containing more belt deck materials 40 are layered in a position other than the overlap section 45 in the area where the belt cover layer 15 is arranged. Thus, in the present embodiment, the belt cover layer is 15 two layers of belt decking materials 40 in a different position than the overlap section 45 layered, and the belt decking material 40 is in three layers in the overlap section 45 layered. In other words, the belt top layer is layered. 15 a so-called complete covering made of two layers of belt decking material 40 formed so that they extend through the belt layer in the tire width direction 14 is arranged, and the overlap section 45, which extends in the tire width direction across the equatorial plane of the tire CL, is formed by three layers of the belt cover material 40 educated.

[0043] Furthermore, the first decking material differs. 41 and the second decking material 42 , the position of the inner end section 41a of the first covering material 41 in the tire circumferential direction and the position of the inner end section 42a of the second covering material 42 in the circumferential direction of the tire, with these positions defining the area of ​​the overlap section. 45 Define in the direction of tire width.

[0044] Since here the first decking material 41 and the second decking material 42 Arranged spirally around the tire's axis of rotation, both are inclined in the tire's width direction relative to its circumference. Furthermore, the position of the inner end section differs.41a of the first covering material 41 in the tire circumferential direction from the position of the inner end section 42a of the second covering material 42 in the tire's circumferential direction. Thus, the overlap section 45 , which is achieved by overlapping the first covering material 41 and the second covering material 42 In the radial direction of the tire, a width W is formed in the tire width direction, which changes depending on the position in the circumferential direction of the tire.

[0045] The overlap section 45 with the width W, which varies in the direction of the tire width, has a minimum width Wmin (see Fig. 3), which is a width at a position where the width W in the tire width direction is minimized by 5 mm or more and a maximum width Wmax (see Fig. 3), which is a width at a position where the width W in the tire width direction is maximized, of 40 mm or less. In other words, the overlap section has 45 The width W in the tire width direction is within a range of 5 mm or more and 40 mm or less. Method for manufacturing a pneumatic tire

[0046] Next, a manufacturing process for the pneumatic tire will be described. 1 as described in the embodiment. For manufacturing the pneumatic tire. 1 First, each of the links that make up the pneumatic tire will be removed. 1 The rubber components are formed, processed, and the processed parts are joined together. That is, the rubber components, such as the tread rubber layer, are... 4 , and the respective components, such as the bead core 11, the carcass layer 13 , the belt layer 14 and the belt cover layer 15The individual components are processed, and the processed links are joined together. The belt cover layer is then made from these. 15 on the outer side of the belt layer in the tire radial direction 14 by spirally wrapping the strip-shaped belt covering materials 40 on the outer side of the belt layer in the tire radial direction 14 arranged around the tire's axis of rotation.

[0047] As belt decking materials 40 , which form the links to create the belt cover layer 15 In the present embodiment, the first cover material is... 41 (see Fig. 3) and the second covering material 42 (see Fig. 3) used. One step in arranging the belt cover layer. 15 on the outer side of the belt layer in the tire radial direction 14 includes the following: one step of spirally wrapping the first cover material 41from the position between the shoulder region Ash on the second side S2 (see Fig. 2) and the equatorial plane of the tire CL to the shoulder region Ash on the first side S1 (see Fig. 2); one step of spirally wrapping the second cover material 42 from a position between the shoulder area Ash on the first side S1 and the equatorial plane of the tire CL to the shoulder area Ash on the second side S2; one step of the spiral winding of the first cover material 41 from the shoulder area Ash on the first side S1 to the equatorial plane of the tire CL; and one step of the spiral winding of the second cover material. 42 from the shoulder area Ash on the second side S2 to the equatorial plane of the tire CL.

[0048] When the first covering material 41 and the second decking material 42 are wound in a spiral shape, the first covering material 41and the second decking material 42 spirally shaped with approximately the same gradient as the widths of the first covering material 41 and the second covering material 42 wrapped. In other words, the layers overlap during the step of spirally wrapping the first layer of covering material. 41 and the second covering material 42 adjacent rotation sections of the first decking material 41 and the second covering material 42 no, and the first cover material 41 and the second decking material 42 They are wound with a slope such that the adjacent sections of the winding do not separate from each other. Thus, the first layer material is preferably... 41 and the second decking material 42The edge sections of adjacent twisted sections are wound in contact with each other. If the adjacent twisted sections overlap, the width of the overlapping sections is preferably 3 mm or less. If the adjacent twisted sections are separated from each other, the distance between them is preferably 3 mm or less.

[0049] Fig. 6 is a schematic view that illustrates directions in which a first decking material is applied. 41 and a second covering material 42 are wrapped. In the step of wrapping the first covering material. 41 The first covering material will be applied first. 41 wound spirally towards the shoulder area Ash on the first side S1, with the inner end section 41a of the first covering material 41It is positioned between the shoulder area Ash on the second side S2 and the equatorial plane of the tire CL. In other words, the wrapping of the first cover material begins. 41 from the inner end section 41a , and the first covering material 41 is wrapped from the second side of the S2 side to the shoulder area Ash of the first side S1, thus the base section 41b of the first covering material 41 is formed. As soon as the base section 41b of the first covering material 41 Once formed, the first covering material will be 41 to the outside in the tire radial direction and bent back and wound spirally from the shoulder area Ash of the first side S1 to the equatorial plane of the tire CL. In particular, the first cover material 41, which is bent outwards in the tire radial direction and back, in the shoulder area Ash, from the shoulder area Ash of the first side S1 to the equatorial plane of the tire CL on the outside of the base section 41b of the first covering material 41 wound in the tire radial direction and the outer end section 41d is positioned on or near the equatorial plane of the tire CL. This results in the recurved section 41c of the first covering material 41 educated.

[0050] Furthermore, in the step of wrapping the second cover material 42 first the second covering material 42 wound spirally towards the shoulder area Ash on the second side S2, with the inner end section 42a of the second covering material 42It is positioned between the shoulder area Ash on the first side S1 and the equatorial plane of the tire CL. In other words, the wrapping of the second cover material begins. 42 from the inner end section 42a , and the second decking material 42 is wrapped from the first side of side S1 to the shoulder area Ash of the second side S2, thus the base section 42b of the second covering material 42 is formed. As soon as the base section 42b of the second covering material 42 Once formed, the second covering material will be applied. 42 to the outside in the tire radial direction and bent back and wound spirally from the shoulder area Ash of the second side S2 to the equatorial plane of the tire CL. In particular, the second cover material 42, which is bent outwards in the tire radial direction and back, in the shoulder area Ash, from the shoulder area Ash of the second side S2 to the equatorial plane of the tire CL on the outside of the base section 42b of the second covering material 42 wound in the tire radial direction and the outer end section 42d is positioned on or near the equatorial plane of tire CL. As a result, the bent-back section 42c of the second covering material 42 educated.

[0051] Accordingly, in the step of wrapping the first covering material 41 , while the inner end section 41a of the first covering material 41 The second side, S2, is positioned, containing most of the first deck material. 41 The first side, S1, is wrapped in two layers. In the step of wrapping the second cover material... 42will be, while the inner end section 42a of the second covering material 42 The first side S1 is positioned, containing most of the second deck material. 42 wrapped in two layers on the second side S2.

[0052] It should be noted that the outer end section 41d of the first covering material 41 preferably located on the equatorial plane of the tire CL. If the outer end section 41d When positioned near the equatorial plane of the tire CL, the outer end section 41d preferably positioned near the equatorial plane of the tire CL, while on the second side S2 it is positioned. Similarly, the outer end section is located 42d of the second covering material 42 preferably on the equatorial plane of the tire CL. If the outer end section 42dWhen positioned near the equatorial plane of the tire CL, the outer end section 42d preferably positioned near the equatorial plane of the tire CL, while it is positioned on the first side S1. The outer end section 41d of the first covering material 41 and the outer end section 42d of the second covering material 42 preferably have a distance from the equatorial plane of the tire CL within a range of 0 mm or more and 20 mm or less.

[0053] Furthermore, when the first decking material 41 and the second decking material 42 The shoulder areas are bent back, the first deck material 41 and the second decking material 42 preferably bent so that they form the end section 144 of the belt layer 14 in the direction of the tire width. In other words, the belt lining material 40preferably arranged such that the width of the belt cover layer 15 in the tire width direction equal to or greater than the width of the belt layer 14 in the tire width direction and that the entire area of ​​the belt layer 14 in the tire width direction from the outside in the tire radial direction.

[0054] The step of wrapping the first covering material 41 and the step of wrapping the second top layer material 42 are carried out with overlapping times. In other words, at least part of the step of wrapping the first cover material is completed. 41 and at least part of the step of wrapping the second cover material 42 in the step of wrapping the first covering material 41 and in the step of wrapping the second cover material 42at the same time. For example, the step of spirally wrapping the first covering material. 41 from the position between the shoulder area Ash on the second side S2 and the equatorial plane of the tire CL to the shoulder area Ash on the first side S1 and the step of spirally wrapping the second cover material 42 The process is carried out simultaneously from the position between the shoulder area Ash on the first side S1 and the tire equatorial plane CL to the shoulder area Ash on the second side S2. Additionally, the step of spirally wrapping the first cover material is performed. 41 from the shoulder area Ash on the first side S1 to the equatorial plane of the tire CL and the step of spirally wrapping the second cover material 42The process is carried out simultaneously and parallel from the shoulder area Ash on the second side S2 to the equatorial plane of the tire CL. Thus, in the step of wrapping the first cover material, 41 and the step of wrapping the second cover material 42 wrapping the first covering material 41 and the wrapping of the second cover material 42 started simultaneously.

[0055] When wrapping the first covering material 41 and the second covering material 42 on the outside of the belt layer 14 in the radial direction of the tire, the first cover material 41 and the second decking material 42 starting from the inner end sections 41a , 42a wound. This causes the position of the inner end section to change. 41a of the first covering material 41 in the tire circumferential direction and the position of the inner end section 42a of the second covering material42 They differ from each other in the direction of the tire's circumference. This results in the inner end section 41a of the first covering material 41 and the inner terminal section 42a of the second covering material 42 separate from each other. In the first cover material 41 and the second decking material 42 is done simultaneously with the winding of the inner end section 41a of the first covering material 41 and the winding of the inner end section 42a of the second covering material 42 started, with the inner end sections 41a , 42a as described above.

[0056] It should be noted that a distance by which the inner end section 41a of the first covering material 41 and the inner terminal section 42a of the second covering material 42are separated in one direction along the tire's circumference, preferably within a range of 5 mm or more and 500 mm or less.

[0057] By the first covering material 41 and the second decking material 42 are arranged in a predetermined area, while the first cover material 41 and the second decking material 42 spirally around the tire's axis of rotation on the outside of the belt layer 14 The belt cover layer is wound in the radial direction of the tire. 15 arranged over the area in the tire width direction where the belt layer 14 on the outside of the belt layer 14 is arranged in the tire radial direction.

[0058] Furthermore, in the step of wrapping the first covering material 41 and the step of wrapping the second cover material 42 the section of the first covering material 41, which is the base section 41b forms, and the section that forms the bent-back section 41c forms, layered in the tire radial direction, and the section of the second cover material 42 , which is the base section 42b forms, and the section that forms the bent-back section 42c forms, layered in the radial direction of the tire. However, even with the first layer of material... 41 and the second decking material 42 The part of it that is identical in position in the tire width direction is layered in the tire radial direction. In other words, in the steps of wrapping the first cover material... 41 and the second covering material 42 , in the area between the section of the first decking material 41 on the second side S2 and the section of the second cover material 42 on the first page S1, the first cover material 41 and the second decking material42 as well as the first decking materials 41 and the second decking materials 42 layered in the tire radial direction, creating overlap sections 45 are formed. In other words, in the step of wrapping the first covering material, 41 and the step of wrapping the second cover material 42 not only the first decking materials 41 and the second decking materials 42 , but also the first covering material 41 and the second decking material 42 layered in the tire radial direction at the position located between the section that is in the first cover material 41 at the second page S2 is located, and the section that is in the second cover material 42 located on the first side S1, extends. Consequently, the overlap section 45 formed by the number of belt covering materials 40, which overlap in the tire radial direction, is larger than in other sections.

[0059] This process takes place during the step of wrapping the first covering material. 41 and the step of wrapping the second cover material 42 , the first covering material 41 and the second decking material 42 wound in such a way that they are inclined in the tire width direction with respect to the tire circumference direction, since both the first cover material 41 as well as the second decking material 42 are wound in a spiral. Furthermore, the first covering material is... 41 and the second decking material 42 wound in such a way that the position of the inner end section 41a of the first covering material 41 in the tire circumferential direction and the position of the inner end section 42a of the second covering material 42They differ from each other in the direction of the tire's circumference. Accordingly, the overlap section 45 designed in a configuration in which the width W in the tire width direction changes depending on the position in the tire circumference direction. Functions and effects

[0060] To mount the pneumatic tire 1 According to the present embodiment, a rim wheel R (see Fig. 7) on the bulge section 10 attached to the pneumatic tire 1 to mount on the rim wheel R, and then the pneumatic tire 1 inflated with air and mounted on the vehicle. The alignment when the pneumatic tire 1When mounted on the vehicle, the arrangement can be such that the first side S1 is on the inner side (in the direction of the vehicle's width) and the second side S2 is on the outer side (in the direction of the vehicle's width), or the first side S1 is on the outer side (in the direction of the vehicle's width) and the second side S2 is on the inner side (in the direction of the vehicle's width). It should be noted that with pneumatic tires... 1 , where the alignment is correct when mounting the pneumatic tire 1 If a vehicle is provided with, the ratio between the inner and outer sides in a vehicle mounting direction and the first side S1 and the second side S2 can be preset.

[0061] The pneumatic tire 1 According to the present embodiment, for example, the pneumatic tire 1 , which can be used under high loads, like the pneumatic tire 1 with standard ADDITIONAL LOAD. Therefore, the pneumatic tire1 with a relatively high air pressure when inflating. Thus, when the pneumatic tire 1 When used under high load, the pneumatic tire 1 Used with increased air pressure. If the vehicle is equipped with pneumatic tires 1 When driving, the pneumatic tire rotates. 1 so that the ground contact surface 3 on a section located on an underside in the soil contact surface 3 The vehicle is positioned in contact with the road surface. It is propelled by transmitting a driving or braking force to the road surface, or by generating a turning force, whereby the frictional force between the contact area and the road surface is increased. 3 and is used on the road surface.

[0062] For example, if the vehicle on which the pneumatic tires are fitted 1When mounted on a dry road surface, the vehicle moves mainly by transferring a driving force or a braking force to the road surface or by generating a turning force through a frictional force between the ground contact surface. 3 and the road surface. When the vehicle drives on a wet road surface, it drives in such a way that water is drawn between the road surface and the contact surface. 3 and the road surface in grooves, like the main grooves 30 and the tunnel grooves, enters and the water between the ground contact surface 3 and the road surface is channeled through these grooves. 3 simply held on the road surface, and the frictional force between the ground contact surface 3 and the road surface allows the vehicle to drive as desired.

[0063] Furthermore, the pneumatic tire is inflated during the vehicle's journey. 1 The vehicle is subjected to a load associated with the weight of the vehicle body, acceleration / deceleration, and turning. Accordingly, a large load acts in the tire's radial direction. This load is primarily absorbed by the pneumatic tires. 1 the injected air is absorbed, but is also absorbed by the tread section 2 and the side wall section 8 as well as the air inside the pneumatic tire 1 recorded. That is, the side wall section 8 transfers a load between the bead section 10 , to which the rim wheel R is attached, and the tread section 2 , and the tread section 2 transfers the load between the side wall section 8 and the road surface. Therefore, the large load acts on the side wall section. 8 and the tread section 2, when the vehicle is moving, and the side wall section 8 and the tread section 2 They absorb this load by being deflected essentially in the radial direction of the tire.

[0064] When the vehicle is moving, the pneumatic tire also rotates. 1 and therefore the position in the ground contact area moves 3 The area that comes into contact with the road surface constantly moves in the circumferential direction of the tire. Accordingly, the positions within the sidewall section are constantly changing. 8 and the tread section 2 The air filaments, which are deflected by the load while the vehicle is moving, also rotate in the direction of the tire's circumference. Therefore, when the vehicle is moving, the pneumatic tire rotates. 1 , while the sequential deflection of the respective positions of the side wall section 8 and the tread section 2 repeated in the direction of the tire's circumference.

[0065] Furthermore, there may be a protrusion, such as a stone, on the road surface over which the vehicle is driving, and the vehicle may drive over such a protrusion with the tread section while driving. 2 of the pneumatic tire 1 If, at this point, the side wall section 8 and the tread section 2 due to the high air pressure with which the pneumatic tire 1 If inflated, it may exhibit a low degree of distraction; the pneumatic tire can 1 The protrusion does not absorb the deformation of the road surface caused by the protrusion, and the protrusion may penetrate into the tread section. 2 of the pneumatic tire 1 one. That means that with pneumatic tires 1 with the increased internal pressure when the protrusion on the road surface is driven over, the slight deflection of the side wall section 8and the tread section 2 This causes the protrusion to extend into the tread section 2 penetrates and may cause a shock burst.

[0066] On the other hand, with the pneumatic tire 1 according to the present embodiment, the belt cover layer 15 through the first covering material 41 and the second decking material 42 formed, and the first covering material 41 and the second decking material 42 form the overlap section 45 , which extends across the equatorial plane of the tire CL in the direction of the tire width. Thus, impact bursting, which occurs in a case where the internal pressure is increased, can be suppressed. Fig. 7 is an explanatory diagram illustrating a condition in which the pneumatic tire 1 according to the first embodiment, a projection 105 on a road surface 100runs over. With the pneumatic tire 1 According to the present embodiment, the sections of the first cover material can be overlapped in the tire radial direction. 41 and the second covering material 42 , which extend across the equatorial plane of the tire CL in the tire width direction, the overlap section 45 , where more of the belt deck materials 40 Compared to the other sections, the layers are formed at the position extending across the equatorial plane of the tire (CL). This increases the tensile strength at or near the center of the tread section in the tire's width direction. 2 Even if the lead 105 on the road surface 100 The penetration of the projection can occur if the vehicle passes over or near the central section of the bridge 21, where ground contact pressure is likely to increase. 105 through the tread section 2can be suppressed. Accordingly, a shock burst caused by the protrusion can be suppressed. 105 is run over while the vehicle is in motion.

[0067] Furthermore, the first decking material 41 and the second decking material 42 , which form the belt cover layer 15 form, with the exception of the overlapping section 45 arranged at various positions in the direction of tire width. Accordingly, the first layer material can be 41 and the second decking material 42 by simultaneously winding the sections in a spiral pattern, with the exception of the overlapping section. 45 can be arranged. Consequently, if the belt cover layer 15For the purpose of improving impact burst resistance performance, the arrangement is implemented with increased productivity. This allows both impact burst resistance performance and productivity to be achieved in a compatible manner.

[0068] The process for manufacturing the pneumatic tire 1 According to the embodiment, the first decking material is used 41 and the second decking material 42 as the belt decking materials 40 and includes the step of spirally wrapping the first covering material 41 from the position between the shoulder area Ash on the second side S2 and the equatorial plane of the tire CL to the shoulder area Ash on the first side S1; and the step of spirally wrapping the second cover material 42from a position between the shoulder region Ash on the first side S1 and the equatorial plane of the tire CL to the shoulder region Ash on the second side S2. With these steps, the first deck material can be applied. 41 and the second decking material 42 They are wound simultaneously. The process for manufacturing the pneumatic tire. 1 According to the embodiment, this also includes: the step of spirally winding the first cover material. 41 from the shoulder area Ash on the first side S1 to the equatorial plane of the tire CL; and the step of spirally wrapping the second cover material. 42 From the shoulder area Ash on the second side S2 to the equatorial plane of the tire CL. These steps allow the first decking material to be applied. 41 and the second decking material 42 They can be wound simultaneously. This reduces the time required to arrange the belt cover layer. 15This achieves two layers of full coverage on the outside of the belt layer. 14 They can be arranged in the tire radial direction without reducing productivity.

[0069] Furthermore, the steps of wrapping the first covering material include 41 and the second covering material 42 , in the area between the section of the first decking material 41 , which is located on the second page S2, and the section of the second cover material 42 , which is located on the first page S1, the first cover material 41 and the second decking material 42 as well as the first decking materials 41 and the second decking materials 42 layered in the tire radial direction, thus creating the overlap section 45 is formed by three layers of belt covering materials 40are layered. Accordingly, the breaking strength can be affected at or near the center in the tire width direction of the tread section. 2 , where the ground contact pressure is likely to increase, through the overlap section 45 the belt cover layer 15 can be increased. Thus, even in a case where the lead 105 on the road surface 100 is driven over at or near the central bridge section 21, the penetration of the projection 105 through the tread section 2 be suppressed, and a shock burst caused by driving over the ledge. 105 The impact that occurs while the vehicle is in motion can be suppressed. This allows both impact burst resistance performance and productivity to be achieved in a compatible manner.

[0070] Furthermore, the steps of wrapping the first covering material are described below. 41 and the second covering material42 wrapping the first covering material 41 and the wrapping of the second cover material 42 They started simultaneously. This reduces the time needed to wrap the belt cover material. 40 The belt cover layer is required. 15 The time required to form the belt cover layer can be further reduced. Accordingly, the reduction in time for forming the belt cover layer can be further reduced. 15 This can be achieved more reliably. Therefore, productivity can be improved more reliably.

[0071] Furthermore, since the overlap section 45 the width W in the tire width direction is within the range of 5 mm or more and 40 mm or less, exhibiting a strength of the overlap section 45 more reliably ensured, while preventing an excessive increase in the weight of the belt cover layer. 15 is suppressed. In other words, in a case where the width W of the overlap section is 45If the gap is less than 5 mm, the strength of the overlap section may be affected. 45 It may not be possible to ensure this with certainty, as the width W of the overlap section 45 is too narrow. In this case, even if the overlap section 45 It can be difficult to determine the breaking strength at or near the center in the tire width direction of the tread section. 2 to improve effectively, and this can make it difficult to penetrate the lead. 105 , which passes through the tread section 2 is driven over by the tread section 2 to effectively prevent this. If the width W of the overlap section 45 If the width is greater than 40 mm, the width W of the overlap section is... 45 excessively large, so there is a possibility that the belt cover material used is 40 becomes excessively large. In this case, the weight of the belt cover layer increases. 15possibly excessive and the weight of the pneumatic tire 1 takes place by providing the overlap section 45 possibly excessively.

[0072] In contrast, if the width W of the overlap section 45 If the difference is in the range of 5 mm or more and 40 mm or less, the strength of the overlap section may be affected. 45 more reliably ensured, while the excessive increase in the weight of the belt cover layer 15 is suppressed, and the breaking strength at or near the center in the tire width direction of the tread section. 2 Where ground contact pressure is likely to increase, it can be improved more reliably. As a result, while the weight increase of the pneumatic tire 1 By suppressing the impact, the shock burst resistance performance is improved. Modified examples

[0073] In the embodiments described above, four main grooves are used. 30 formed, but the number of main grooves 30 It can also be other than four. In the embodiments described above, although the central rib section 21 is positioned on the equatorial plane of the tire CL, the rib section 20 It may not be positioned on the equatorial plane of the tire CL. For example, the main groove may not 30 CL should be positioned on the equatorial plane of the tire. If the main groove 30 CL is positioned on the equatorial plane of the tire; at least part of the overlap section is 45 the belt cover layer 15 preferably on the inner side of the web section in the tire radial direction 20 , which is closest to an equatorial plane of the tire CL, from the majority of rib sections 20 positioned. Examples

[0074] Fig. Table 8 shows the results of performance evaluation tests for pneumatic tire manufacturing processes. The following describes performance evaluation tests performed on the pneumatic tire. 1 be carried out, which is carried out by the process for manufacturing the pneumatic tire 1 The tests are carried out according to the embodiments of the present invention and are performed on pneumatic tires manufactured by methods according to comparative examples. For the performance evaluation tests, a piston test, an evaluation test for impact burst resistance performance, and a test for the productivity of tire manufacturing were performed.

[0075] The performance evaluation tests were conducted using the pneumatic tire. 1The test was performed using the nominal size 275 / 40ZR19 105Y of the tire defined by JATMA and mounted on a standard JATMA rim wheel with a rim size of 19x9.5J. The evaluation procedure for each of the test elements was performed for the piston test by inflating the test tire to a regular internal pressure, performing a piston burst test according to JIS K6302 with a piston diameter of 19 mm and an insertion speed of 50 mm / minute, and measuring the tire burst energy J. The evaluation results of the piston test show that the higher the measured tire burst energy J, the higher the tire strength and the higher the impact burst resistance performance.

[0076] Furthermore, in terms of productivity, the time required to wind the belt cover materials was measured. 40 in the step of wrapping the belt covering materials 40was required during the manufacture of the tire. Productivity is expressed as an index rating of the inverse of the measurement time, using the prior art example described below. 1 100 is assigned. Higher index values ​​indicate a shorter winding time and higher productivity.

[0077] The performance evaluation tests were carried out on eight types of pneumatic tires, including examples 1 to 6, the pneumatic tire examples. 1 are those resulting from the process of manufacturing the pneumatic tire 1 manufactured according to the embodiments of the present invention, and comparative examples 1 and 2 , which are examples of pneumatic tires that are manufactured using different processes compared to the process for manufacturing the pneumatic tire 1are manufactured according to the embodiments of the present invention. The pneumatic tire of the comparative example is derived from these pneumatic tires. 1 not the overlap section 45 in the belt cover layer 15 one. It should be noted that in the pneumatic tire of the comparison example 1 the belt cover layer 15 through a full-surface belt covering material 40 is formed. In the case of the pneumatic tire of the comparative example. 2 closes the belt cover layer 15 the overlap section 45 one, and the overlap section 45 consists of a single belt decking material 40 In other words, the pneumatic tire in the comparison example 2 the overlap section 45 by inserting a belt covering material 40 with a narrow width in the tire width direction between two belt lining materials 40formed with full coverage, with the belt deck material 40 the overlap section 45 forms. Thus, in the pneumatic tire of the comparison example, 2 three belt decking materials 40 used the belt cover layer 15 form.

[0078] In contrast, examples 1 to 6, the examples of pneumatic tires, conclude 1 are those resulting from the process of manufacturing the pneumatic tire 1 all belt cover layers are produced according to the embodiments of the present invention. 15 the overlap section 45 one, and the belt deck material 40 , the belt cover layer 15 forms, uses two layers of the first top layer material 41 and the second covering material 42 Furthermore, the pneumatic tires vary. 1 According to examples 1 to 6, the widths W of the overlap sections 45and whether the majority of belt decking materials 40 should be wound simultaneously if the majority of belt covering materials 40 is being wrapped.

[0079] As a result of conducting the performance evaluation tests using these pneumatic tires 1 , as in Fig. As illustrated in 8, the pneumatic tires showed 1 According to Examples 1 to 6, the impact burst resistance performance and productivity assessed by the piston test were not lower than those of the comparison example. 1 and that at least one of the services is superior to the comparative examples 1 and 2 was improved. In other words, the process for manufacturing pneumatic tires could be improved. 1 According to examples 1 to 6, both impact burst resistance performance and productivity are achieved in a compatible manner. Reference symbol list 1 pneumatic tire 2. Tread section 3 Ground contact surface 4 tread rubber layers 5 Shoulder section 8 Side wall section 10 bead section 13 Carcass layer 14 Belt layer 15 Belt cover layer 16 Inner Soul 18 Tire inner surface 20 Bridge section 30 Main groove 40 belt decking material 41 First decking material 41a, 42a Inner end section 41b, 42b Basic section 41c, 42c Recurved section 41d, 42d Outer end section 42 Second decking material 45 Overlap section 100 Road surface 105 lead QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 4865259 B

[0004] JP 2010064644 A

[0004] JP 2017137032 A

[0004] JP 4635366 B

[0004] JP 4687201 B

[0004]

Claims

[1] Method for manufacturing a pneumatic tire which arranges a belt cover layer on an outer surface of a belt layer in the tire radial direction by winding a strip-shaped belt cover material spirally around a tire axis of rotation, the method comprising: a step of using a first cover material and a second cover material in the belt cover material and, wherein one side in a tire width direction with respect to an equatorial plane of the tire is defined as a first side and another side in the tire width direction with respect to the equatorial plane of the tire is defined as a second side, spirally wrapping the first cover material from a position between a shoulder area on the second side and the equatorial plane of the tire to a shoulder area on the first side; one step of the spiral wrapping of the second cover material from a position between the shoulder area on the first side and the equatorial plane of the tire to the shoulder area on the second side; one step of the spiral wrapping of the first cover material from the shoulder area on the first side to the equatorial plane of the tire; and one step of the spiral wrapping of the second cover material from the shoulder area on the second side to the equatorial plane of the tire, wherein the first cover material and the second cover material, as well as the first cover materials and the second cover materials, are layered in the tire radial direction in an area between a section of the first cover material located on the second side and a section of the second cover material located on the first side, thereby forming an overlap section. [2] Method for manufacturing a pneumatic tire according to claim 1, wherein the winding of the first cover material and the winding of the second cover material are started simultaneously. [3] Method for manufacturing a pneumatic tire according to claim 1 or 2, wherein the overlap section has a width in the tire width direction within a range of 5 mm or more and 40 mm or less.