tire

Abstract

To provide a tire which can sufficiently discharge the electricity generated from a vehicle body to the outside.SOLUTION: A tire according to the present invention comprises: a conductive rubber part 5; a rubber chafer 3; and a conductive member 6 which extends from the rubber chafer to a reinforcement layer 30. The reinforcement layer includes one or more high resistance layers whose volume resistivity is greater than 1×108 Ω cm. In a tire width direction region of at least a portion of the high resistance layer, the thickness of coating rubber between cords adjacent to each other in the tire width direction is equal to or less than the diameter of the cord (or the thickness of the coating rubber between the cords adjacent to each other in the tire width direction is equal to or less than 0.5 mm in the tire width direction region of at least a portion of the high resistance layer).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a tire. [Background technology]

[0002] BACKGROUND ART Conventionally, a method of dissipating electricity generated from a vehicle body to the ground via tires has been known (for example, Patent Document 1).

[0003] Meanwhile, with increasing demand for tires with low fuel consumption, attempts have been made to reduce the rolling resistance of tires by applying low-loss rubber compositions to tires. From the viewpoint of reducing the rolling resistance of tires, it is advantageous to apply low-loss rubber compositions to various case components constituting the tire in addition to low-loss tread rubber. For this reason, low-loss rubber compositions have been used for the coating rubber of reinforcing layers such as belt layers and belt reinforcing layers. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2015-123900 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the use of a low-loss rubber composition for the coating rubber of the reinforcing layer increases electrical resistance, and in some cases, it becomes difficult to sufficiently dissipate electricity generated from the vehicle body to the outside.

[0006] Therefore, an object of the present invention is to provide a tire that can sufficiently release electricity generated from the vehicle body to the outside. [Means for solving the problem]

[0007] The gist and configuration of the present invention are as follows. (1) A tire comprising a pair of bead portions and a carcass extending toroidally between the pair of bead portions, and a reinforcing layer and a tread rubber in this order on the radially outer side of a crown portion of the carcass, A conductive rubber portion extends from a surface of the tread rubber toward an inner side in the tire radial direction in a part of the tread rubber, a rubber chafer disposed on an outer surface side of the bead portion in the tire width direction; a conductive member extending from the rubber chafer to the reinforcing layer, The reinforcing layer has a volume resistivity of 1×10 8 It has one or more high-resistivity layers with a resistance of more than Ω·cm, the high resistance layer has a code; a thickness of the coating rubber between the cords adjacent in the tire width direction in at least a portion of the tire width direction region of the high resistance layer being equal to or less than a diameter of the cord.

[0008] Here, "thickness of coating rubber" refers to the thickness measured in the radial direction of the tire when the tire is mounted on an applicable rim, inflated to the specified internal pressure, and under standard conditions with no load. The "diameter of the cord" refers to the maximum diameter in a cross section perpendicular to the extending direction of the cord. In this specification, "applicable rim" refers to the standard rim (Measuring Rim in the ETRTO Standards Manual, Design Rim in the TRA Year Book) for the applicable size that is described or will be described in the future, as an industrial standard in effect in the region where the tire is produced and used, such as the JATMA Year Book of the Japan Automobile Tire Manufacturers Association (JATMA) in Japan, the Standards Manual of the European Tyre and Rim Technical Organization (ETRTO) in Europe, or the Year Book of the Tire and Rim Association, Inc. (TRA) in the United States (in other words, the above "rim" includes not only current sizes but also sizes that may be included in the above industrial standards in the future. An example of a "size to be described in the future" is the size listed under "FUTURE DEVELOPMENTS" in the 2013 edition of the ETRTO.), however, in the case of a size not described in the above industrial standards, it refers to a rim with a width that corresponds to the bead width of the tire. Furthermore, "specified internal pressure" refers to the air pressure (maximum air pressure) that corresponds to the maximum load capacity of a single wheel for the applicable size and ply rating as specified in the above JATMA etc., and in the case of sizes not specified in the above industry standards, "specified internal pressure" refers to the air pressure (maximum air pressure) that corresponds to the maximum load capacity specified for each vehicle on which the tire is fitted.

[0009] (2) A tire comprising a pair of bead portions and a carcass extending toroidally between the pair of bead portions, and a reinforcing layer and a tread rubber provided in this order on the radially outer side of a crown portion of the carcass, A conductive rubber portion extends from a surface of the tread rubber toward an inner side in the tire radial direction in a part of the tread rubber, a rubber chafer disposed on an outer surface side of the bead portion in the tire width direction; a conductive member extending from the rubber chafer to the reinforcing layer, The reinforcing layer has a volume resistivity of 1×10 8 It has one or more high-resistivity layers with a resistance of more than Ω·cm, the high resistance layer has a code; A tire, characterized in that in at least a portion of the tire width direction region of the high resistance layer, the thickness of the coating rubber between the cords adjacent in the tire width direction is 0.5 mm or less.

[0010] (3) The tire according to (2) above, wherein in at least a portion of the tire width direction region of the high resistance layer, the thickness of the coating rubber between the cords adjacent in the tire width direction is 0.3 mm or less.

[0011] (4) The tire according to any one of (1) to (3) above, wherein the high resistance layer has a thickness of 2 mm or less in at least a portion of the high resistance layer in the tire width direction region. Here, the "thickness of the high resistance layer" refers to the sum of the cord diameter of the high resistance layer and the thickness of the coating rubber, and refers to the thickness measured in the tire radial direction under the above-mentioned standard conditions.

[0012] (5) The tire according to any one of (1) to (4) above, wherein the at least some of the tire width direction regions are present at a plurality of locations in the tire width direction. Here, when there are a plurality of the above-mentioned tire width direction regions, the "width of the tire width direction region" refers to the sum of the widths thereof.

[0013] (6) The reinforcing layer has a belt consisting of one or more belt layers and one or more belt reinforcing layers arranged on the outer side of the belt in the tire radial direction, The belt reinforcing layer is a spiral layer in which a ply is wound spirally, At least one of the at least one belt reinforcing layers is the high resistance layer, A tread undercushion is further provided on the tire radial direction outer side of the belt reinforcing layer, The tire according to any one of (1) to (5) above, wherein the conductive rubber portion terminates outside the belt reinforcing layer in the tire radial direction.

[0014] (7) The reinforcing layer has a belt consisting of one or more belt layers and one or more belt reinforcing layers arranged on the outer side of the belt in the tire radial direction, The belt reinforcing layer is a spiral layer in which a ply is wound spirally, At least one of the at least one belt reinforcing layers is the high resistance layer, A tread undercushion is further provided on the tire radial direction outer side of the belt reinforcing layer, The tire according to any one of (1) to (5) above, wherein the conductive rubber portion terminates within the belt reinforcing layer.

[0015] (8) The reinforcing layer has a belt consisting of one or more belt layers and one or more belt reinforcing layers arranged on the outer side of the belt in the tire radial direction, The belt reinforcing layer is a spiral layer in which a ply is wound spirally, At least one of the at least one belt reinforcing layers is the high resistance layer, A tread undercushion is further provided on the tire radial direction outer side of the belt reinforcing layer, The tire according to any one of (1) to (5) above, wherein the conductive rubber portion penetrates through the belt reinforcing layer and terminates on the inner side of the belt reinforcing layer in the tire radial direction.

[0016] (9) The reinforcing layer is made of only a belt having one or more belt layers, The tire according to any one of the above (1) to (5), wherein at least one layer of the at least one belt layer is the high resistance layer.

[0017] (10) The volume resistivity of the rubber chafer is 1×10 8 Ω·cm or less, and the volume resistivity of the coating rubber of the carcass is 1×10 8 The tire according to any one of (1) to (9) above, which has a compressive strength exceeding Ω·cm.

[0018] (11) The tire according to any one of (1) to (10) above, wherein the conductive member is a conductive fiber. [Effects of the Invention]

[0019] According to the present invention, it is possible to provide a tire that can sufficiently release electricity generated from the vehicle body to the outside. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a cross-sectional view in the tire width direction of a tire according to one embodiment of the present invention. [Figure 2] FIG. 2 is a schematic diagram showing an example of the thickness of the coating rubber between the cords and the thickness of the high-resistance layer. [Figure 3] FIG. 10 is a schematic diagram of another example showing the thickness of the coating rubber between the cords and the thickness of the high-resistance layer. [Figure 4] FIG. 10 is a schematic diagram of another example showing the thickness of the coating rubber between the cords and the thickness of the high-resistance layer. [Figure 5] 10 is a schematic diagram showing an example of the extension range of a conductive rubber portion when the belt reinforcing layer is one layer. FIG. [Figure 6] 10 is a schematic diagram showing an example of the extension range of a conductive rubber portion when the belt reinforcing layer is two layers. FIG. [Figure 7] 10 is a schematic diagram showing another example of the extending range of the conductive rubber portion when the belt reinforcing layer is one layer. FIG. [Figure 8] 10 is a schematic diagram showing another example of the extending range of the conductive rubber portion when the belt reinforcing layer is two layers. FIG. [Figure 9] 10 is a schematic diagram showing another example of the extension range of the conductive rubber portion when the belt reinforcing layer is one layer. FIG. [Figure 10] 10 is a schematic diagram showing another example of the extending range of the conductive rubber portion when the belt reinforcing layer is two layers. FIG. [Figure 11] FIG. 10 is a schematic diagram showing an example of the extension range of a conductive rubber portion when a belt reinforcing layer is not provided. [Figure 12] 6 is a schematic diagram showing a modified example of the position of the conductive member, corresponding to FIG. 5. FIG. [Figure 13] 7A and 7B are schematic diagrams corresponding to FIG. 6 and showing modified examples of the positions of the conductive members. [Figure 14] 8A and 8B are schematic diagrams corresponding to FIG. 7 and showing modified examples of the positions of the conductive members. [Figure 15] 9A and 9B are schematic diagrams showing modified examples of the positions of the conductive members, corresponding to FIG. 8. [Figure 16] 10A and 10B are schematic diagrams corresponding to FIG. 9 and showing modified examples of the positions of the conductive members. [Figure 17] 11A and 11B are schematic diagrams showing modified examples of the positions of the conductive members, corresponding to FIG. 10. [Figure 18] 12A and 12B are schematic diagrams showing modified examples of the positions of the conductive members, corresponding to FIG. 11. DETAILED DESCRIPTION OF THE INVENTION

[0021] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0022] Fig. 1 is a tire widthwise cross-sectional view of a tire according to one embodiment of the present invention. Fig. 1 shows a tire widthwise cross-section in the reference state. Note that Fig. 1 shows only one half of the tire widthwise direction bounded by the tire equatorial plane CL, but the other half of the tire widthwise direction has a similar configuration. In this example, the tire is a pneumatic tire.

[0023] As shown in FIG. 1, this tire includes a pair of bead portions 11, a pair of sidewall portions 12 extending radially outward from the pair of bead portions 11, and a tread portion 13 extending across the pair of sidewall portions 12 to form a ground contact portion.

[0024] A bead core 9 and a bead filler 10 disposed on the outer side of the bead core 9 in the tire radial direction are disposed in the bead portion 11. A rubber chafer 3 is disposed on the outer surface side of the bead portion 11 in the tire width direction. The volume resistivity of the rubber chafer is 1×10 8 It is preferable that the resistance is Ω·cm or less, and 1×10 7It is more preferable that the volume resistivity is Ω·cm or less. By setting the volume resistivity of the rubber chafer 3 within the above range, it is possible to obtain a good effect of reducing the electrical resistance of the tire.

[0025] The tire also has a carcass 1 made up of one or more carcass plies (one in the illustrated example) that toroidally spans between a pair of bead portions 11. In this example, the volume resistivity of the coating rubber of the carcass is 1×10 8 The volume resistivity of the coating rubber of the carcass is more preferably 1×10 10 Ω·cm or more, and more preferably 1×10 13 The resistance is Ω·cm or more. This allows for low loss. The above range can be achieved by adjusting the amount of carbon black added, for example. Organic fibers can be used for the carcass cords, for example.

[0026] A reinforcing layer and a tread rubber 13G are arranged in this order on the tire radially outer side of the crown portion of the carcass 3. In this example, a tread undercushion 13C is further arranged on the tire radially outer side of the reinforcing layer and on the tire radially inner side of the tread rubber 13G.

[0027] In this example, the reinforcing layer includes one or more belt layers 2 (two layers in the illustrated example) and one or more belt reinforcing layers 30 (so-called cap layers) (one layer in the illustrated example) arranged radially outward of the belt layers 2. In this example, the belt layers 2 are inclined belt layers in which belt cords cross each other between layers. For example, steel cords can be used as the belt cords. In this example, the volume resistivity of the belt coating rubber is 1×10 8 It is preferable that the resistance is Ω·cm or less, and 1×10 7 It is more preferable that the resistivity is Ω·cm or less.

[0028] In this example, the belt reinforcing layer 30 is a spiral layer formed by spirally winding plies. The cord used in the belt reinforcing layer 30 may be, for example, a steel cord. In this example, the coating rubber of the belt reinforcing layer has a volume resistivity of 1×10 8 The volume resistivity is preferably greater than 1×10 10 Ω·cm or more, and more preferably 1×10 13 Ω·cm or more. This allows for low loss. In this example, the width of the belt reinforcing layer 30 in the tire width direction is narrower than the width of the belt 2 in the tire width direction, but it can also be wider or the same.

[0029] In this example, the tread undercushion 13C has a width in the tire width direction that is wider than that of the belt 2. The volume resistivity of the tread undercushion 13C is 1×10 8 It is preferable that the resistance is Ω·cm or less, and 1×10 7 It is more preferable that the resistivity is Ω·cm or less.

[0030] In the illustrated example, a conductive rubber portion 5 is disposed in a part of the tread rubber, extending from the surface of the tread rubber toward the inside in the tire radial direction. The volume resistivity of the conductive rubber portion 5 is 1×10 8 It is preferable that the resistance is Ω·cm or less, and 1×10 7 It is more preferable that the resistivity is Ω·cm or less.

[0031] This tire further includes a conductive member 6 extending from the rubber chafer 3 to the reinforcing layer. That is, the conductive member 6 electrically connects from the rubber chafer 3 to the reinforcing layer. In the illustrated example, the conductive member 6 extends between the belt 2 and the belt reinforcing layer 30, and terminates at a position in the tire width direction where the conductive rubber portion 5 is located. On the other hand, the conductive member 6 is not limited to the above-mentioned extending position as long as it electrically connects from the rubber chafer 3 to the reinforcing layer. The conductive member 6 has a volume resistivity of 1×10 8 Ω·cm or less, preferably 1×10 7 In this example, the conductive member 6 is a conductive fiber 7.

[0032] The resistivity of the conductive fiber 7 is the linear resistivity, which is the resistivity per unit length, of 1×10 7 It is preferable that the resistance is Ω / cm or less, and 1×10 3 It is more preferable that the resistance is Ω / cm or less.

[0033] The conductive fiber 7 may have any structure, and different types of conductive fibers may be used in combination. Preferably, composite fibers having a conductive portion and a non-conductive portion can be used as the conductive fiber 7. Specific examples of the conductive portion constituting such conductive fiber 7 include metal-containing fibers, carbon-containing fibers, and metal oxide-containing fibers, and any one or more of these can be used. Here, the metal-containing fibers refer to fibers with a metal content of 5 to 100 mass %, and examples of metals and metal oxides include stainless steel, steel, aluminum, copper, and oxides thereof. Furthermore, examples of the non-conductive portion include cotton, nylon, polyesters such as polyethylene terephthalate (PET), and organic materials such as polypropylene (PP), and any one or more of these can be used. Composite fibers composed of these conductive and non-conductive portions have good elongation and excellent adhesion, and therefore do not break even when subjected to stress loads during the tire manufacturing process or strain input during vehicle travel, making them suitable for use as the conductive fiber 7.

[0034] The mass ratio of the conductive portion in the conductive fiber 7 is not particularly limited, but is preferably 10 to 90 mass %, and more preferably 15 to 85 mass %. By including the non-conductive portion in the above ratio, the elongation of the conductive fiber 7 can be favorably ensured, and by including the conductive portion in the above ratio, the effect of reducing the electrical resistance of the tire can be favorably obtained, which are preferable.

[0035] As the conductive fiber 7, specifically, for example, Bekinox (registered trademark) manufactured by Bekaert, Kuracarbo (registered trademark) KC-500R, KC-793R manufactured by Kuraray Trading Co., Ltd., or the like can be used.

[0036] The fineness of the conductive fibers 7 is preferably 20 to 3000 dtex, more preferably 100 to 1000 dtex, and even more preferably 150 to 600 dtex, from the viewpoint of achieving a balance between air release properties, conductivity, and durability.

[0037] When the conductive fibers 7 are arranged in the form of fibers, they may be arranged in a straight line, a zigzag pattern, or a wavy pattern. Furthermore, if the conductive fibers 7 are arranged at an angle to the tire circumferential direction, a conductive path from the tread portion 13 to the bead portion 11 can be ensured. However, it is preferable that the conductive fibers 7 are arranged so as to extend in a direction that is 60° to 120° with respect to the tire circumferential direction, or even 80° to 110° with respect to the tire circumferential direction, and particularly so in the tire width direction. When the conductive fibers 7 are arranged in a zigzag or wavy pattern, the direction in which the conductive fibers 7 extend as a whole is defined as the extension direction of the conductive fibers 7.

[0038] The conductive fiber 7 can also be used to replace bleeder cords that are placed to remove air during vulcanization. Bleeder cords are cord components placed on one or both sides of the carcass or belt layer to reduce air-filling defects that occur during the tire production process, and are generally made of cotton yarn, polyester yarn, or the like. Bleeder cords absorb and pass through air trapped inside the tire during the tire production process, thereby reducing air-filling defects. By replacing some or all of the bleeder cords placed on the carcass with conductive fiber 7, the benefits of placing conductive fiber 7 can be achieved without adding any new components. Of course, the bleeder cords may remain as they are and conductive fiber 7 may be added.

[0039] When the conductive fibers 7 are used in place of conventional bleeder cords, the conductive fibers 7 can be used to replace 10 to 100 mass %, preferably 20 to 50 mass %, of the bleeder cord. This number of fibers can be replaced with the conductive fibers 7.

[0040] The conductive fiber 7 may be either a spun yarn or a filament yarn, but is preferably a spun yarn (blended yarn) made by spinning staple fibers. To ensure adhesion between the conductive fiber 7 and the rubber, the conductive fiber 7 may be dipped in an adhesive to ensure adhesion between the organic fiber and the rubber. However, providing a surface coating of adhesive on the conductive fiber 7 by dipping reduces the air release properties through the conductive fiber 7. Therefore, when using the conductive fiber 7 in place of a bleeder cord, it is preferable to only partially dip the fiber, and more preferably not dip the fiber at all. However, without a surface coating of adhesive, the adhesion between the conductive fiber 7 and the unvulcanized rubber is weak, which may result in the conductive fiber 7 falling off during manufacturing. In this case, using a spun yarn (blended yarn) is preferable because the anchoring effect of the staple fibers ensures adhesion to the rubber even without dipping, maintaining a conductive path while maintaining air release properties. When filament yarn is used, it is preferable to add twist to maintain air-releasing properties. In this case, the number of twists can be suitably 10 times / 10 cm or more, for example, 30 to 60 times / 10 cm.

[0041] On the other hand, when replacing a portion of the bleeder cord with conductive fiber 7, the remaining bleeder cord made of, for example, cotton yarn can ensure air release, so that both adhesion to the rubber and air release can be achieved even if the conductive fiber 7 is dipped. Therefore, although the conductive fiber 7 may be dipped, it is also preferable that the bleeder cord is not dipped in order to ensure design freedom, such as by replacing all of the bleeder cord with conductive fiber 7.

[0042] From the viewpoint of reliably securing a conductive path in the tire circumferential direction, it is preferable that at least two conductive fibers 7 are provided throughout the entire tire.

[0043] In the tire having the above configuration, the conductive member 6 (conductive fiber 7) can form a conductive path from the rubber chafer 3 to the reinforcing layer. On the other hand, in this embodiment, the reinforcing layer has a volume resistivity of 1×10 8 The tire has one or more high resistance layers with a resistance of more than Ω·cm (in this example, one belt reinforcing layer 30 is the high resistance layer). For this reason, it is important to make the high resistance layer conductive in order to dissipate electricity from the vehicle body from the tire to the road surface.

[0044] In the tire of this embodiment, as shown in Figure 2, in at least a portion of the tire width direction region of the high-resistivity layer (between each cord in the illustrated example), the thickness t1 of the coating rubber between adjacent cords in the tire width direction is equal to or less than the cord diameter. According to Ohm's law, electrical resistance is inversely proportional to distance, so when the thickness is extremely thin like this, conductivity can be maintained even when the volume resistivity is high. This allows for the formation of a conductive path from the rubber chafer 3 through the conductive member 6 to the reinforcing layer, and from the reinforcing layer through the tread undercushion and the conductive rubber portion 5 to the road surface. Therefore, according to the tire of this embodiment, electricity generated from the vehicle body can be sufficiently released to the outside.

[0045] In another embodiment, the thickness t1 of the coating rubber between the cords is 0.5 mm or less, and more preferably 0.3 mm or less. The thickness t1 can be adjusted to the above range by, for example, adjusting the amount of vulcanized rubber supplied. In this alternative embodiment, the thickness t1 may be equal to or smaller than the diameter of the cord, but may also be larger than the diameter of the cord as shown in FIG. Alternatively, as shown in FIG. 4, the coating rubber between the cords may be positioned so as not to overlap the cords when projected in the cord alignment direction, so that the thickness of the coating rubber between the cords is thinner than the thickness t3 between the coating rubber and the cord at the location where the cord is located.

[0046] Preferably, the at least one tire width direction region is present at a plurality of locations in the tire width direction, because this allows electricity generated from the vehicle body to be more reliably released to the outside.

[0047] In at least a portion of the high-resistance layer in the tire width direction, the thickness t2 of the high-resistance layer is preferably 2 mm or less (more preferably 1.5 mm or less), thereby enabling the formation of more highly conductive areas. In this case, for the same reasons as above, it is preferable that the at least a portion of the tire width direction area exists in multiple locations in the tire width direction. Note that the thickness t2 can be adjusted to the above range, for example, by adjusting the amount of vulcanized rubber supplied or by using cords with a small diameter.

[0048] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments. For example, the electrically conductive rubber portion 5 may terminate radially outward of the belt reinforcing layer 30 (FIGS. 5 and 6), or may terminate within the belt reinforcing layer 30 (FIGS. 7 and 8), or may penetrate the belt reinforcing layer 30 and terminate radially inward of the belt reinforcing layer 30 (FIGS. 9 and 10). While the above-described embodiments illustrate the case where the belt reinforcing layer is a high-resistance layer, as shown in FIG. 11, the belt reinforcing layer may be omitted, and the reinforcing layer may consist solely of a belt made up of one or more belt layers, at least one of which may be a high-resistance layer. Furthermore, for at least one or more of the belt layers, the thickness t1 of the coating rubber between adjacent cords in the tire width direction may be equal to or less than the cord diameter (or 0.5 mm or less, more preferably 0.3 mm or less) in at least a portion of the tire width direction. Preferably, the thickness t2 of the belt layer may be equal to or less than 2 mm (more preferably 1.5 mm or less). In this case as well, it is preferable that the at least some tire width direction regions exist at a plurality of locations in the tire width direction.

[0049] Furthermore, the extending position of the conductive member 6 (conductive fiber 7) can be modified in various ways. In the examples shown in Figs. 5 to 110, the conductive member 6 is located between the belt layer 2 and the belt reinforcing layer 30, but for example, as shown in Figs. 12 to 17, the conductive member 6 may be located between the carcass 1 and the belt layer 2. In the example of Fig. 12, the configuration of the tire components other than the conductive member 6 corresponds to the configuration of the tire components in Fig. 5, and the same applies to Figs. 13 and 6, Figs. 14 and 7, Figs. 15 and 8, Figs. 16 and 9, and Figs. 17 and 10. Furthermore, in the example of Figure 11, in which the belt reinforcing layer 30 is not provided, the conductive member 6 is located between the belt layer 2 and the tread undercushion 13C, but as shown in Figure 18, the conductive member 6 may be located between the carcass 1 and the belt layer 2. Many other variations and modifications are possible. [Explanation of symbols]

[0050] 1: carcass; 2: belt layer; 3: rubber chafer; 30: Belt reinforcing layer, 5: Conductive rubber portion, 6: Conductive member, 7: Conductive fiber, 9: Bead core, 10: Bead filler, 11: Bead portion, 12: Sidewall portion, 13: Tread portion

Claims

1. A tire comprising a pair of bead portions and a carcass extending toroidally between the pair of bead portions, and a reinforcing layer and a tread rubber provided in this order on the tire radial direction outer side of a crown portion of the carcass, A conductive rubber portion extends from a surface of the tread rubber toward an inner side in the tire radial direction in a part of the tread rubber, a rubber chafer disposed on an outer surface side of the bead portion in the tire width direction; a conductive member extending from the rubber chafer to the reinforcing layer, The reinforcing layer has a volume resistivity of 1×10 ８ It has one or more high resistance layers with a resistance of more than Ω cm, the high resistance layer has a code; In at least a portion of a tire width direction region of the high resistance layer, a thickness of the coating rubber between the cords adjacent in the tire width direction is equal to or less than a diameter of the cord, The reinforcing layer includes a belt including one or more belt layers and one or more belt reinforcing layers disposed on the outer side of the belt in the tire radial direction, The belt reinforcing layer is a spiral layer in which a ply is wound spirally, At least one of the at least one belt reinforcing layers is the high resistance layer, A tread undercushion is further provided on the tire radial direction outer side of the belt reinforcing layer, The tire, wherein the conductive rubber portion terminates within the belt reinforcing layer.

2. A tire comprising a pair of bead portions and a carcass extending toroidally between the pair of bead portions, and a reinforcing layer and a tread rubber provided in this order on the tire radial direction outer side of a crown portion of the carcass, A conductive rubber portion extends from a surface of the tread rubber toward an inner side in the tire radial direction in a part of the tread rubber, a rubber chafer disposed on an outer surface side of the bead portion in the tire width direction; a conductive member extending from the rubber chafer to the reinforcing layer, The reinforcing layer has a volume resistivity of 1×10 ８ It has one or more high resistance layers with a resistance of more than Ω cm, the high resistance layer has a code; In at least a portion of a tire width direction region of the high resistance layer, a thickness of the coating rubber between the cords adjacent in the tire width direction is equal to or less than a diameter of the cord, The reinforcing layer includes a belt including one or more belt layers and one or more belt reinforcing layers disposed on the outer side of the belt in the tire radial direction, The belt reinforcing layer is a spiral layer in which a ply is wound spirally, At least one of the at least one belt reinforcing layers is the high resistance layer, A tread undercushion is further provided on the tire radial direction outer side of the belt reinforcing layer, The tire, wherein the conductive rubber portion penetrates through the belt reinforcing layer and terminates radially inward of the belt reinforcing layer.

3. A tire comprising a pair of bead portions and a carcass extending toroidally between the pair of bead portions, and a reinforcing layer and a tread rubber provided in this order on the tire radial direction outer side of a crown portion of the carcass, A conductive rubber portion extends from a surface of the tread rubber toward an inner side in the tire radial direction in a part of the tread rubber, a rubber chafer disposed on an outer surface side of the bead portion in the tire width direction; a conductive member extending from the rubber chafer to the reinforcing layer, The reinforcing layer has a volume resistivity of 1×10 ８ It has one or more high resistance layers with a resistance of more than Ω cm, the high resistance layer has a code; In at least a portion of the tire width direction region of the high resistance layer, a thickness of the coating rubber between the cords adjacent in the tire width direction is 0.5 mm or less, The reinforcing layer includes a belt including one or more belt layers and one or more belt reinforcing layers disposed on the outer side of the belt in the tire radial direction, The belt reinforcing layer is a spiral layer in which a ply is wound spirally, At least one of the at least one belt reinforcing layers is the high resistance layer, A tread undercushion is further provided on the tire radial direction outer side of the belt reinforcing layer, The tire, wherein the conductive rubber portion terminates within the belt reinforcing layer.

4. A tire comprising a pair of bead portions and a carcass extending toroidally between the pair of bead portions, and a reinforcing layer and a tread rubber provided in this order on the tire radial direction outer side of a crown portion of the carcass, A conductive rubber portion extends from a surface of the tread rubber toward an inner side in the tire radial direction in a part of the tread rubber, a rubber chafer disposed on an outer surface side of the bead portion in the tire width direction; a conductive member extending from the rubber chafer to the reinforcing layer, The reinforcing layer has a volume resistivity of 1×10 ８ It has one or more high resistance layers with a resistance of more than Ω cm, the high resistance layer has a code; In at least a portion of the tire width direction region of the high resistance layer, a thickness of the coating rubber between the cords adjacent in the tire width direction is 0.5 mm or less, The reinforcing layer includes a belt including one or more belt layers and one or more belt reinforcing layers disposed on the outer side of the belt in the tire radial direction, The belt reinforcing layer is a spiral layer in which a ply is wound spirally, At least one of the at least one belt reinforcing layers is the high resistance layer, A tread undercushion is further provided on the tire radial direction outer side of the belt reinforcing layer, The tire, wherein the conductive rubber portion penetrates through the belt reinforcing layer and terminates radially inward of the belt reinforcing layer.

5. The tire according to claim 3 or 4, wherein in at least a portion of the high resistance layer in the tire width direction, a thickness of the coating rubber between the cords adjacent in the tire width direction is 0.3 mm or less.

6. The tire according to any one of claims 1 to 5, wherein the high resistance layer has a thickness of 2 mm or less in at least a portion of a region in the tire width direction of the high resistance layer.

7. The tire according to any one of claims 1 to 6, wherein the at least some tire width direction regions are present at a plurality of locations in the tire width direction.

8. The volume resistivity of the rubber chafer is 1×10 ８ Ω cm or less, and the volume resistivity of the coating rubber of the carcass is 1×10 ８ 8. The tire according to claim 1, wherein the tensile strength is greater than Ω·cm.

9. The tire according to any one of claims 1 to 8, wherein the conductive member is a conductive fiber.

Images