Pneumatic tire

Abstract

The utility model provides a pneumatic tire. In a tire in which an electronic component is disposed, the weight is reduced, and damage to a carcass cord in a portion in which the electronic component is disposed is suppressed. The pneumatic tire comprises a tread part (2), a pair of tire side parts (3), a pair of tire bead parts (4), an annular tire body (6), a lining layer (10) and an electronic component (21). The carcass (6) includes a plurality of carcass cords (15) and a carcass ply (6A). The inner liner (10) includes a butyl rubber layer (11) and a barrier rubber layer (12). The butyl rubber layer (11) is disposed so as to form a tire inner cavity surface. The spacer rubber layer (12) is locally disposed at a length smaller than that of the butyl rubber layer (11) in the radial direction. The electronic component (21) is disposed between the butyl rubber layer (11) and the spacer rubber layer (12) so as not to be in contact with the topping rubber layer (16).

Description

Technical Field

[0001] The utility model relates to a pneumatic tire. Background Art

[0002] Conventionally, in order to reduce the weight of the tire, a tire in which an inner liner and a carcass are joined without using a tie rubber layer has been proposed (for example, refer to Patent Document 1 listed below).

[0003] Patent Document 1: Japanese Patent Application Publication No. 2021-147024

[0004] In the above tire, when an electronic component such as an RFID tag is embedded between the inner liner and the carcass, the electronic component may come into contact with the carcass cord, which may cause fatigue failure of the carcass cord during running. Utility Model Content

[0005] The present invention has been made in view of the above-mentioned actual situation, and a main object of the present invention is to achieve weight reduction in a tire in which electronic components are arranged, and to suppress damage to a carcass cord in a portion in which the electronic components are arranged.

[0006] The utility model is a pneumatic tire, wherein the pneumatic tire comprises: a tread portion; a pair of sidewall portions; a pair of bead portions, wherein bead cores are respectively embedded in the pair of bead portions; an annular carcass extending between the bead cores of the pair of bead portions; an annular inner liner extending inside the carcass and between the pair of bead portions; and at least one electronic component arranged between the carcass and the inner liner, wherein the carcass comprises a carcass ply, wherein the carcass ply comprises a plurality of carcass cords and a topping rubber layer covering the plurality of carcass cords, The inner liner layer includes a butyl rubber layer and an isolation rubber layer, wherein the isolation rubber layer is composed of a rubber having a higher adhesion to the topping rubber layer than the adhesion of the butyl rubber layer to the topping rubber layer, the butyl rubber layer is configured to form an inner cavity surface of the tire, the isolation rubber layer is configured between the butyl rubber layer and the topping rubber layer, and is locally configured with a radial length smaller than that of the butyl rubber layer, and the electronic component is configured between the butyl rubber layer and the isolation rubber layer in a manner not to contact the topping rubber layer.

[0007] In the pneumatic tire of the present invention, it is preferred that the electronic component is covered with a covering rubber, and the shortest distance from the carcass cord to the electronic component is 0.5 mm to 1.8 mm.

[0008] In the pneumatic tire of the present invention, it is preferable that the shortest distance from the butyl-based rubber layer to the electronic component is 0.1 mm to 0.4 mm.

[0009] In the pneumatic tire of the present invention, it is preferred that the insulation rubber layer have a loss tangent value tanδ of 0.16 or less.

[0010] In the pneumatic tire of the present invention, it is preferred that the complex elastic modulus E* of the insulation rubber layer is 4.0 MPa or more.

[0011] In the pneumatic tire of the present invention, preferably, the electronic component includes a metallic main body having an IC chip and an antenna extending in a spiral shape around the main body.

[0012] In the pneumatic tire of the present invention, it is preferred that the spiral outer diameter of the antenna is 1.8 mm to 2.0 mm.

[0013] In the pneumatic tire of the present invention, the pneumatic tire preferably includes an electronic module, which includes a covering rubber that covers the electronic components, and the bead portion includes a bead apex rubber extending from the bead core to the outside in the radial direction of the tire, and the distance in the radial direction of the tire from the inner end of the electronic module in the radial direction of the tire to the outer surface of the bead core is 50% to 60% of the height of the bead apex rubber in the radial direction of the tire.

[0014] In the pneumatic tire of the present invention, the distance (L2) in the radial direction of the tire from the outer end of the electronic module in the radial direction of the tire to the outer end of the bead apex in the radial direction of the tire is preferably 25% to 35% of the height of the bead apex.

[0015] In the pneumatic tire of the present invention, the carcass preferably includes a plurality of carcass cords and a carcass cord reference plane passing through the ends of the plurality of carcass cords on the tire inner cavity surface side, the pneumatic tire includes an electronic module, and the electronic module preferably includes a covering rubber covering the electronic components, the covering rubber includes an inner layer in contact with the butyl rubber layer, an outer layer in contact with the isolation rubber layer, and a boundary surface between the inner layer and the outer layer, and the ratio (d1 / d2) of the first distance (d1) as the shortest distance from the boundary surface to the carcass cord reference plane to the second distance (d2) as the shortest distance from the boundary surface to the butyl rubber layer is 1.8 to 2.2.

[0016] The pneumatic tire of the present invention can achieve weight reduction by adopting the above-mentioned structure, and can suppress damage to the carcass cord in the portion where the electronic components are arranged. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional view of a pneumatic tire according to one embodiment of the present invention.

[0018] Figure 2 yes Figure 1 An enlarged cross-sectional view of the carcass ply and inner liner.

[0019] Figure 3 yes Figure 1 An enlarged view of the tire bead portion.

[0020] Figure 4 yes Figure 3 An enlarged perspective view of the electronic module.

[0021] Figure 5 yes Figure 3 An enlarged cross-sectional view of the carcass, inner liner, and electronic module.

[0022] Figure 6 It is a cross-sectional view of a pneumatic tire according to another embodiment of the present invention.

[0023] Figure 7 It is a cross-sectional view of a pneumatic tire according to another embodiment of the present invention.

[0024] Figure 8 It is a cross-sectional view of a pneumatic tire according to another embodiment of the present invention.

[0025] Fig. 9 4 is a cross-sectional view of a pneumatic tire of Comparative Example 1.

[0026] Fig.10 It is a cross-sectional view of a pneumatic tire of Comparative Example 2.

[0027] Description of symbols

[0028] 2: tread; 3: sidewall; 5: bead core; 4: bead; 6: carcass; 6A: carcass ply; 10: inner liner; 11: butyl rubber layer; 12: isolation rubber layer; 16: topping rubber layer; 15: carcass cord; 21: electronic components. DETAILED DESCRIPTION

[0029] Hereinafter, several embodiments of the present invention will be described based on the accompanying drawings. The accompanying drawings contain the features of the present invention, but in order to help understand the present invention, sometimes they contain exaggerated expressions or expressions with different dimensional ratios from the actual structure. In addition, in each embodiment, the same or common elements are marked with the same reference numerals, and repeated descriptions are omitted. Figure 1 2 is a cross-sectional view showing a cross section of a pneumatic tire 1 (hereinafter, sometimes simply referred to as a "tire") according to the present embodiment in a standard state. Figure 1 The figure shows a cross section of the tire 1 when the tire 1 extending in a toroidal shape is cut by a virtual plane passing through the tire rotation axis and perpendicular to the tire circumferential direction. The tire 1 of this embodiment is suitable for use in, for example, a passenger car.

[0030] In the case of pneumatic tires with various definite specifications, the aforementioned standard state refers to a state in which the tire is assembled on a standard rim and filled with a standard internal pressure, and is unloaded. In the case of tires with various uncertain specifications, the aforementioned standard state refers to a standard usage state corresponding to the intended use of the tire, and is unloaded. In this specification, unless otherwise specified, the dimensions of various parts of the tire are values ​​measured under the aforementioned standard state. Furthermore, the dimensions of structures that cannot be measured under the aforementioned standard state (for example, the internal parts of the tire 1) are values ​​measured to make the tire 1 as close to the aforementioned standard state as possible.

[0031] A "standard rim" is a rim whose specifications are determined for each tire in a specification system that includes the specifications that the tire is based on. For example, if it is JATMA, it is a "standard rim", if it is TRA, it is a "design rim (Design Rim)", and if it is ETRTO, it is a "measuring rim (Measuring Rim)".

[0032] "Standard internal pressure" is the air pressure of each specification determined for each tire in the specification system including the specifications to which the tire is based. If it is JATMA, it is the "maximum air pressure". If it is TRA, it is the maximum value recorded in the table "Tire load limits at various cold inflation pressures (TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES)". If it is ETRTO, it is the "inflation pressure (INFLATION PRESSURE)".

[0033] like Figure 1 As shown, the tire 1 of this embodiment includes a tread portion 2, a pair of sidewall portions 3, and a pair of bead portions 4. A bead core 5 is embedded in each bead portion 4. The tire 1 also includes a carcass 6, an inner liner 10, and at least one electronic component 21.

[0034] The carcass 6 extends in a ring shape between the bead core 5 of a pair of bead portions 4. The carcass 6 of the present embodiment is composed of, for example, one carcass ply 6A. The carcass ply 6A includes, for example, a main body 6a and a folded portion 6b. The main body 6a extends, for example, between two bead portions 4. Thus, the main body 6a at least reaches the bead core 5 of the bead portion 4 from the tread portion 2 through the sidewall portion 3. The folded portion 6b is, for example, connected to the main body 6a, and folds around the bead core 5 from the inner side to the outer side of the tire axial direction. A bead apex rubber 8 extending from the bead core 5 to the outer side in the radial direction of the tire is arranged between the main body 6a and the folded portion 6b, so as to appropriately reinforce the bead portion 4.

[0035] The inner liner 10 extends annularly inside the carcass 6 and between the pair of bead portions 4 .

[0036] exist Figure 2 An enlarged cross-sectional view of the carcass ply 6A and the inner liner 10 is shown in FIG. Figure 2 2 is a cross-sectional view of the carcass ply 6A and the inner liner 10 at a position avoiding the electronic component 21. Figure 2 In the figure, the rubber components closer to the outer surface of the tire than the carcass ply 6A are omitted. Figure 2 As shown, the carcass ply 6A includes a plurality of carcass cords 15 and a topping rubber layer 16 covering the plurality of carcass cords 15 .

[0037] For example, organic fiber cords such as aramid and rayon are used as the carcass cords 15. The carcass cords 15 are preferably arranged at an angle of 70° to 90° with respect to the tire equator C, for example.

[0038] As the rubber component of the topping rubber layer 16 of the carcass 6, isoprene rubber, styrene-butadiene rubber (SBR), butadiene rubber (BR), nitrile rubber (NBR), chloroprene rubber (CR), butyl rubber (IIR), styrene-isoprene-butadiene copolymer rubber (SIBR) and other diene rubbers can be listed. They can be used alone or in combination of two or more. Among them, isoprene rubber, SBR, and BR are preferred.

[0039] The structure of the carcass ply 6A described above is an example, and the carcass 6 of the present invention can be applied to a known structure. Figure 1 As shown, in the tread portion 2 of the tire 1 of the present embodiment, a belt layer 7 is provided on the outer side of the carcass 6 in the radial direction of the tire, and the belt layer 7 includes metallic belt cords. The belt layer 7 includes, for example, two belt plies 7A and 7B. A plurality of belt cords arranged at an angle of 15° to 45° relative to the tire circumferential direction are respectively arranged in the two belt plies 7A and 7B. The belt cords of the belt ply 7A on one side and the belt cords of the belt ply 7B on the other side are inclined in opposite directions relative to the tire circumferential direction. Thus, the tread portion 2 is effectively reinforced.

[0040] The electronic component 21 is disposed between the carcass 6 and the inner liner 10. In the present embodiment, one of the pair of bead portions 4 ( Figure 1 The electronic component 21 is disposed on the sidewall portion 3 or the tread portion 2. However, the present invention is not limited to such a form, and the electronic component 21 may be disposed on the sidewall portion 3 or the tread portion 2, for example.

[0041] exist Figure 3 FIG. 4 shows an enlarged cross-sectional view of the bead portion 4 in which the electronic component 21 is arranged. Figure 4 FIG. 2 shows an enlarged perspective view of an electronic module 20 including an electronic component 21. Figure 4 The outer surface of the electronic module 20 is marked with points. Figure 3and Figure 4 As shown, the electronic component 21 is covered with a covering rubber 22. Hereinafter, in this specification, the component composed of the electronic component 21 and the covering rubber 22 is referred to as an electronic module 20. In other embodiments, the electronic component 21 may be directly disposed between the carcass 6 and the inner liner 10.

[0042] As the electronic component 21, for example, an RFID tag, a pressure sensor, a temperature sensor, an acceleration sensor, and a magnetic sensor can be cited. The electronic component 21 of this embodiment is an RFID tag. Figure 4 As shown, the RFID tag is a small and light electronic component composed of a metallic main body 21a having an IC chip and an antenna 21b. The IC chip is composed of a transceiver circuit, a control circuit, a memory, etc. After receiving the inquiry radio wave, the RFID tag uses it as electric energy and sends the data in the memory as a response radio wave. The RFID tag adopts a well-known structure, and a detailed description is omitted in this manual.

[0043] The covering rubber 22 is preferably a known rubber having excellent adhesiveness. The covering rubber 22 can be a topping rubber layer 16 ( Figure 2 The same rubber as shown).

[0044] like Figure 1 As shown, the inner liner 10 includes a butyl rubber layer 11 and an isolation rubber layer 12. In addition, in each figure of this specification, the isolation rubber layer 12 is marked with a dot. The butyl rubber layer 11 is configured to form the inner cavity surface 1i side of the tire. The butyl rubber layer 11 has an extremely low air permeability and can maintain the internal pressure of the tire. The butyl rubber layer 11 contains, for example, 80% or more of butyl rubber or halogenated butyl rubber.

[0045] The isolation rubber layer 12 is formed by applying a rubber layer 16 ( Figure 2 The insulating rubber layer 12 is preferably composed of an elastomeric composition including natural rubber and styrene-butadiene rubber. Furthermore, the insulating rubber layer 12 is disposed between the butyl rubber layer 11 and the topping rubber layer 16 of the carcass ply 6A. Furthermore, the insulating rubber layer 12 is locally disposed with a smaller length in the radial direction than the butyl rubber layer 11. Here, "locally" means that the insulating rubber layer 12 is not disposed in the entire area of ​​the inner cavity surface of the tire. Therefore, in the present utility model, it can be as follows Figure 1 As in the illustrated embodiment, the insulation rubber layer 12 is partially disposed in the bead portion 4 , but as described later, the insulation rubber layer 12 may be disposed over the bead portion 4 and the sidewall portion 3 .

[0046] exist Figure 5FIG. 4 shows an enlarged cross-sectional view of the carcass ply 6A, the inner liner 10, and the electronic component 21. Figure 5 In order to facilitate the understanding of the utility model, each layer has a certain thickness and the carcass cords 15 are arranged at equal intervals, but the actual tire 1 may contain deformation and strain that are inevitable in rubber products. Figure 5 As shown, the electronic component 21 is arranged between the butyl rubber layer 11 and the insulating rubber layer 12 in a manner that does not contact the topping rubber layer 16. Thus, the tire 1 of the present invention can be lightweight and can suppress damage to the carcass cord 15 in the portion where the electronic component is arranged. The reason is as follows.

[0047] In the utility model, since the isolation rubber layer 12 for improving the adhesion between the butyl rubber layer 11 and the carcass cord layer 6A is locally arranged, the volume of the inner liner 10 can be reduced compared with the existing tire (a tire in which the bonding rubber layer for bonding the butyl rubber layer extends in a ring shape throughout the entire tire), and lightweight can be achieved.

[0048] Furthermore, since the electronic component 21 of the utility model is arranged between the butyl rubber layer 11 and the isolation rubber layer 12 in a manner that does not contact the topping rubber layer 16, even if the area where the electronic component 21 is arranged (the bead portion 4 in this embodiment) is repeatedly deformed due to the use of the tire 1, the electronic component 21 is not easy to contact the carcass cord 15, and damage to the carcass cord 15 in the arrangement portion of the electronic component 21 can be suppressed.

[0049] The following describes a more detailed structure of the present embodiment. In addition, the structure described below shows a specific mode of the present embodiment. Therefore, even if the present invention does not have the structure described below, it can certainly exert the above-mentioned effects. Moreover, even if any one of the structures described below is applied alone to the tire of the present invention having the above-mentioned characteristics, it is possible to expect an improvement in performance corresponding to each structure. Moreover, in the case of applying several of the structures described below in combination, it is possible to expect an improvement in the composite performance corresponding to each structure.

[0050] like Figure 1 As shown, the electronic module 20 including the electronic component 21 is preferably located at a distance of more than 3 mm from the outer surface of the tire bead core 5 in the radial direction of the tire to the outer side in the radial direction of the tire. Furthermore, the electronic module 20 is preferably located at a distance of more than 3 mm from the outer end of the belt layer 7 in the tire axial direction to the inner side in the radial direction of the tire. Thus, the electronic module 20 is separated from the metal components included in the tire bead core 5 and the belt layer 7, thereby suppressing malfunctions of the electronic module 20 such as radio wave interference. In addition, the aforementioned distance is based on the distance from the outer surface of the tire bead core 5 or the outer end of the belt layer 7 to the electronic component 21 ( Figure 4 It is determined by the distance in a direction parallel to the radial direction of the tire to the center of gravity of the tire (as shown).

[0051] like Figure 3 As shown, the electronic module 20 is preferably arranged in the bead portion 4, and in this embodiment, is arranged axially inside the bead apex 8. Thus, deformation around the electronic module 20 is suppressed by the bead apex 8, so the durability of the tire is further improved.

[0052] From the viewpoint of sufficiently ensuring the distance between the electronic component 21 and the bead core 5 and obtaining the above-mentioned effect, the distance L1 in the radial direction of the tire from the inner end of the electronic module 20 in the radial direction of the tire to the outer surface of the bead core 5 is preferably 50% to 60% of the height h1 in the radial direction of the bead apex 8. Furthermore, the distance L2 from the outer end in the radial direction of the tire of the electronic module 20 to the outer end in the radial direction of the tire of the bead apex 8 is preferably 25% to 35% of the aforementioned height h1 of the bead apex 8.

[0053] More specifically, when the height h1 of the bead apex rubber 8 is greater than 35 mm, it is preferred that the distance L1 is greater than 5 mm and the distance L2 is greater than 7 mm. On the other hand, when the height h1 of the bead apex rubber 8 is less than 35 mm, it is sometimes difficult to fully ensure both the distance L1 and the distance L2. Therefore, when the height h1 is less than 35 mm, it is preferred to ensure that the distance L1 is greater than 5 mm and the distance L2 is less than 7 mm.

[0054] like Figure 4 As shown in FIG. 1 , in the electronic component 21 of the present embodiment, the antenna 21b extends in a spiral shape around the main body 21a. Such an electronic component 21 protects the main body 21a with the antenna 21b, and thus can exhibit excellent durability. The spiral outer diameter A1 of the antenna 21b ( Figure 5 The total length of the electronic component 21 (including the total length of the antenna 21b) is, for example, about 35 mm to 50 mm.

[0055] On the other hand, the covering rubber 22 has a total length greater than the aforementioned total length of the electronic component 21 so as to be able to completely cover the electronic component 21. Specifically, the covering rubber 22 is composed of a horizontally long and flat rectangular parallelepiped shape having a first length La, a second length Lb, and a thickness ta. The first length La is the length in the circumferential direction of the tire, for example, 45 mm to 70 mm. The second length Lb is the length in a direction perpendicular to the first length La, which is equivalent to the length of the electronic module 20 along the carcass ply 6A in the tire cross section. The second length Lb is smaller than the first length La, for example, 8 mm to 15 mm. The thickness ta is the thickness in a direction perpendicular to the first length La and the second length Lb. The thickness ta is smaller than the first length La and the second length Lb, for example, 2.0 mm to 3.0 mm, preferably 2.2 mm to 2.4 mm. In addition, in this specification, unless otherwise specified, the thickness of each part refers to the average thickness of each part. Furthermore, the “average thickness of each portion” is, for example, a value obtained by equally dividing a symmetrical portion into a plurality of micro regions and dividing the sum of the thicknesses of the micro regions by the number of micro regions.

[0056] The cover rubber 22 of this embodiment includes a butyl rubber layer 11 ( Figure 5 The inner layer 26 in contact with the isolation rubber layer 12 ( Figure 5 In the present embodiment, the electronic component 21 is disposed between the inner layer 26 and the outer layer 27 of the covering rubber 22. The thickness t1 of the outer layer 27 and the thickness t2 of the inner layer 26 are preferably 0.8 mm to 1.5 mm, and more preferably 1.0 mm to 1.3 mm, respectively. Thus, the durability is further improved.

[0057] like Figure 5 As shown, the covering rubber 22 has a boundary surface 28 between the inner layer 26 and the outer layer 27. The electronic module 20 of the present embodiment is configured in a manner to ensure the first distance d1, which is the shortest distance from the boundary surface 28 to the imaginary carcass cord reference plane 30. The imaginary carcass cord reference plane 30 refers to an imaginary surface connecting the surfaces of multiple carcass cords 15, specifically, a plane or a smooth curved surface passing through the end of each carcass cord 15 on the side of the tire inner cavity surface 1i. Figure 5 In FIG. 1 , a virtual carcass cord reference plane 30 is shown by a two-dot chain line.

[0058] Furthermore, the electronic module 20 of the present embodiment is configured in a manner to ensure the second distance d2, which is the shortest distance from the boundary surface 28 to the butyl rubber layer 11. The first distance d1 is, for example, 2.0 mm to 3.0 mm. And, the second distance d2 is, for example, 1.0 mm to 1.3 mm. When the second distance d2 is large, air accumulation may occur around the electronic module 20, thereby impairing durability. From this point of view, in a preferred embodiment, the ratio d1 / d2 of the first distance d1 to the second distance d2 is 1.8 to 2.2. As a result, peeling at the boundary surface 28 is suppressed.

[0059] The thickness t3 of the insulation rubber layer 12 is, for example, 0.2 mm to 1.5 mm, or preferably 0.4 mm to 1.1 mm. This can reliably prevent the electronic component 21 from coming into contact with the carcass cord 15.

[0060] When the shortest distance d3 from the carcass cord 15 to the electronic component 21 is small, the electronic component 21 is easy to contact the carcass cord 15. On the other hand, when the shortest distance d3 is large, the weight of the tire increases, which sometimes leads to poor uniformity of the tire. Therefore, the shortest distance d3 is preferably 0.5 mm or more, more preferably 0.7 mm or more, preferably 1.8 mm or less, and more preferably 1.6 mm or less.

[0061] The shortest distance d4 from the butyl rubber layer 11 to the electronic component 21 is, for example, 0.1 mm to 0.4 mm. This can prevent the electronic component 21 from coming into contact with the butyl rubber layer 11 .

[0062] like Figure 1 As shown, in the present embodiment, the isolation rubber layer 12 is arranged only on one of the pair of bead portions 4, and the isolation rubber layer 12 is not arranged in other regions. However, as described later, the isolation rubber layer 12 may be arranged in other regions. From the viewpoint of achieving lightweight tire, the sum of the radial lengths of the isolation rubber layers 12 is preferably less than 50% of the total radial length of the tire inner cavity surface 1i, and more preferably less than 30%. Furthermore, from the viewpoint of suppressing peeling damage of the butyl rubber layer 11, the sum of the radial lengths of the isolation rubber layers 12 is preferably more than 5% of the total radial length of the tire inner cavity surface 1i.

[0063] like Figure 3 As shown in FIG. 1 , the inner end 12i of the insulating rubber layer 12 in the tire radial direction is arranged at a position separated by 5 mm or more from the outer surface of the bead core 5 in the tire radial direction. In addition, in the tire cross section, the radial length L3 of the insulating rubber layer 12 is preferably greater than the radial length of the covering rubber 22 (equivalent to Figure 4Specifically, the length L3 of the insulation rubber layer 12 is preferably 4.0 to 6.0 times the length of the cover rubber 22. Thus, the durability of the tire is reliably improved.

[0064] The loss tangent tanδ of the insulation rubber layer 12 is preferably 0.16 or less from the viewpoint of reliably suppressing peeling damage and fatigue failure of the butyl rubber layer 11. The loss tangent tanδ is measured under the following conditions using a viscoelasticity spectrometer in accordance with JIS-K6394.

[0065] Initial strain: 10%

[0066] Amplitude: ±2%

[0067] Frequency: 10Hz

[0068] Deformation Mode: Stretch

[0069] Measurement temperature: 30℃

[0070] From the same viewpoint, the complex elastic modulus E* of the insulation rubber layer 12 is preferably 4.0 MPa or more. The complex elastic modulus E* is a value measured using a viscoelasticity spectrometer under the following conditions in accordance with JIS-K6394.

[0071] Initial strain: 10%

[0072] Amplitude: ±2%

[0073] Frequency: 10Hz

[0074] Deformation Mode: Stretch

[0075] Measurement temperature: 30℃

[0076] like Figure 5 As shown, the thickness t4 of the topping rubber layer 16 (the maximum thickness from the imaginary carcass cord reference plane 30 to the outer surface of the carcass ply 6A in the area in contact with the outer layer 27) is, for example, smaller than the thickness t1 of the outer layer 27 ( Figure 4 ), and is smaller than the thickness t3 of the insulating rubber layer 12. Specifically, the thickness t4 of the topping rubber layer 16 is 0.10 mm to 0.30 mm. Thus, durability can be ensured, the thickness of the carcass 6 can be reduced, and the weight of the tire can be reduced.

[0077] exist Figure 6 FIG. 2 shows a cross-sectional view of a tire 1 according to another embodiment of the present invention. Figure 6As shown, in this embodiment, the insulation rubber layer 12 includes a first insulation rubber layer 12A in contact with the electronic module 20 and at least one second insulation rubber layer 12B not in contact with the electronic module 20. In this embodiment, the second insulation rubber layer 12B is provided in a pair of sidewall portions 3. Thus, the peeling damage of the inner liner 10 is further suppressed.

[0078] In a preferred embodiment, the outer end 12Bo of the second insulating rubber layer 12B in the tire radial direction is preferably located at a distance of 10 mm or more from the outer end 7o of the belt layer 7 in the tire axial direction toward the tire equator C side. In addition, the inner end 12Bi of the second insulating rubber layer 12B in the tire radial direction is preferably located at a distance of 5 mm or more from the tire maximum width position 3M of the tire sidewall portion 3 toward the tire bead core 5 side. Thus, since the second insulating rubber layer 12B is arranged in the region where the tire 1 is easily deformed, the durability of the tire is reliably improved.

[0079] exist Figure 7 FIG. 2 shows a cross-sectional view of a tire 1 according to another embodiment of the present invention. Figure 7 As shown, in this embodiment, the electronic module 20 is arranged in the bead portion 4, and the isolation rubber layer 12 in contact with the electronic module 20 extends to the sidewall portion 3. More specifically, the outer end 12o of the isolation rubber layer 12 in the tire radial direction is located closer to the tire equator C side than the outer end 7o of the belt layer 7 in the tire axial direction. Such an isolation rubber layer 12 can integrally reinforce the sidewall portion 3 and the bead portion 4, and can effectively suppress the peeling damage of the butyl rubber layer 11.

[0080] In this embodiment, a tire side portion 3 is disposed on the opposite side to the side where the electronic module 20 is disposed. Figure 6 The second insulating rubber layer 12B is the same as the embodiment shown in the figure. Thus, it is expected that the tire will be lighter and more durable. Figure 7 In still another modified example of the illustrated embodiment, similar to the insulation rubber layer 12 on which the electronic module 20 is arranged, a second insulation rubber layer 12B may be arranged across the bead portion 4 and the sidewall portion 3 .

[0081] exist Figure 8 FIG. 2 shows a cross-sectional view of a tire 1 according to another embodiment of the present invention. Figure 8 As shown, in this embodiment, the electronic component 21 and the insulating rubber layer 12 are provided on the sidewall portion 3. Figure 6 In the second insulating rubber layer 12B of the embodiment shown, since the electronic component 21 is arranged on the sidewall portion 3, the impact generated when the tire 1 is assembled to the rim is not easily transmitted to the electronic component 21, which helps to prevent the electronic component 21 from being damaged when the rim is assembled.

[0082] In this embodiment, the electronic component 21 is provided between the outer end 7o of the belt layer 7 and the tire maximum width position 3M. The electronic component 21 may be provided, for example, at a position where the electronic module 20 overlaps the tire maximum width position 3M (not shown).

[0083] As mentioned above, although several embodiments of the present invention have been described in detail, the present invention is not limited to the above-mentioned specific embodiments, and can be implemented in various modified forms.

[0084] [Example]

[0085] According to the specifications in Table 1, a prototype with Figure 1 A pneumatic tire for a passenger car with a basic structure of 285 / 65R17 was produced as a comparative example 1. Fig. 9 As a comparative example 2, a tire having a cross section as shown in FIG. Fig.10 The cross section of the tire is shown. Fig. 9 As shown, in Comparative Example 1, the bonding rubber layer c is configured to completely separate the carcass ply a and the butyl rubber layer b, and an electronic module is configured between the carcass ply a and the bonding rubber layer c. Fig.10 As shown, in Comparative Example 2, no bonding rubber layer and no insulating rubber layer are arranged between the carcass ply a and the butyl rubber layer b, and an electronic module d is arranged between the carcass ply a and the butyl rubber layer b. Except for the above items, Comparative Examples 1 and 2 are substantially the same as the tires of the embodiment. The tire weight is measured for each test tire, and the durability of the tire is tested. The common specifications and test methods of the tires are as follows.

[0086] Rim: 17×8.0

[0087] Tire internal pressure: 250kPa

[0088] <Tire weight>

[0089] The weight of the tire excluding the rim was measured, and the result was expressed as an index with the inverse of the tire weight of Comparative Example 1 being 100, and a larger value indicates a smaller tire weight.

[0090] <Tire Durability>

[0091] Each test tire was loaded with a constant longitudinal load (7.33 kN) on a roller tester and traveled at 120 km / h, and the travel distance until damage occurred in the configuration part of the electronic module was measured. The results were expressed as an index with the aforementioned travel distance of Comparative Example 1 as 100, and a larger value indicates a higher durability of the tire.

[0092] The test results are shown in Table 1.

[0093]

Table 1

[0094]

[0095] As shown in Table 1, in Comparative Example 1, in which the tie rubber layer is arranged to completely separate the carcass ply and the butyl rubber layer, the tire weight is large. In addition, in Comparative Example 2, in which no tie rubber layer and insulation rubber layer are arranged between the carcass ply and the butyl rubber layer, the tire durability is greatly reduced to 50 points.

[0096] In contrast, in Examples 1 to 6, the tire weight is smaller than that of Comparative Example 1, while the tire durability is maintained at 60 to 120 points, which is better than that of Comparative Example 2. That is, it is confirmed that in the present invention, in a tire equipped with an electronic module, it is possible to achieve weight reduction and improve the durability of the portion where the electronic module is arranged.

[0097] [Note]

[0098] The utility model includes the following aspects.

[0099] [The utility model 1]

[0100] A pneumatic tire, wherein:

[0101] The pneumatic tire comprises:

[0102] Tread part;

[0103] a pair of sidewalls;

[0104] a pair of bead portions, in which bead cores are respectively embedded;

[0105] a ring-shaped carcass extending between the bead cores of the pair of bead portions;

[0106] an annular inner liner extending inside the carcass and between the pair of bead portions; and

[0107] at least one electronic component disposed between the carcass and the inner liner,

[0108] The carcass comprises a carcass ply layer, wherein the carcass ply layer comprises a plurality of carcass cords and a topping rubber layer covering the plurality of carcass cords.

[0109] The inner lining layer comprises a butyl rubber layer and an isolation rubber layer, wherein the isolation rubber layer is composed of a rubber having a higher adhesive force to the topping rubber layer than the adhesive force of the butyl rubber layer to the topping rubber layer.

[0110] The butyl rubber layer is configured to form the inner cavity surface of the tire.

[0111] The insulating rubber layer is disposed between the butyl rubber layer and the topping rubber layer and is partially disposed with a radial length smaller than that of the butyl rubber layer.

[0112] The electronic component is disposed between the butyl rubber layer and the isolation rubber layer so as not to be in contact with the topping rubber layer.

[0113] [The utility model 2]

[0114] According to the pneumatic tire of the utility model 1,

[0115] The electronic components are covered with rubber,

[0116] The shortest distance from the carcass cord to the electronic component is 0.5 mm to 1.8 mm.

[0117] [Utility Model 3]

[0118] According to the pneumatic tire of the utility model 2, wherein:

[0119] The shortest distance from the butyl rubber layer to the electronic component is 0.1 mm to 0.4 mm.

[0120] [Utility Model 4]

[0121] A pneumatic tire according to any one of 1 to 3 of the present invention, wherein:

[0122] The insulation rubber layer has a loss tangent value tanδ of 0.16 or less.

[0123] [Utility Model 5]

[0124] A pneumatic tire according to any one of 1 to 4 of the present invention, wherein:

[0125] The complex elastic modulus E* of the isolation rubber layer is greater than 4.0 MPa.

[0126] [Utility Model 6]

[0127] A pneumatic tire according to any one of 1 to 5 of the present invention, wherein:

[0128] The electronic component includes a metallic main body having an IC chip and an antenna extending in a spiral shape around the main body.

[0129] [The utility model 7]

[0130] According to the pneumatic tire described in Utility Model 6,

[0131] The spiral outer diameter of the antenna is 1.8 mm to 2.0 mm.

[0132] [Utility Model 8]

[0133] A pneumatic tire according to any one of 1 to 7 of the present invention, wherein:

[0134] The pneumatic tire includes an electronic module including a covering rubber covering the electronic component.

[0135] The bead portion includes a bead apex extending from the bead core toward the outside in the tire radial direction.

[0136] A distance in the tire radial direction from an inner end of the electronic module in the tire radial direction to an outer surface of the bead core is 50% to 60% of a height of the bead apex in the tire radial direction.

[0137] [Utility Model 9]

[0138] According to the pneumatic tire described in Utility Model 8,

[0139] A distance L2 in the tire radial direction from an outer end of the electronic module in the tire radial direction to an outer end of the bead apex in the tire radial direction is 25% to 35% of the height of the bead apex.

[0140] [Utility Model 10]

[0141] A pneumatic tire according to any one of 1 to 9 of the present invention, wherein:

[0142] The carcass includes a plurality of carcass cords and a carcass cord reference plane passing through ends of the plurality of carcass cords on the tire inner cavity surface side.

[0143] The pneumatic tire includes an electronic module including a covering rubber covering the electronic component.

[0144] The covering rubber includes an inner layer in contact with the butyl rubber layer, an outer layer in contact with the insulation rubber layer, and a boundary surface between the inner layer and the outer layer.

[0145] A ratio d1 / d2 of a first distance d1 which is the shortest distance from the boundary surface to the carcass cord reference plane and a second distance d2 which is the shortest distance from the boundary surface to the butyl rubber layer is 1.8 to 2.2.

Claims

1. A pneumatic tire, characterized in that: The pneumatic tire comprises: Tread part; a pair of sidewalls; a pair of bead portions, in which bead cores are respectively embedded; a ring-shaped carcass extending between the bead cores of the pair of bead portions; an annular inner liner extending inside the carcass and between the pair of bead portions; and at least one electronic component disposed between the carcass and the inner liner, The carcass comprises a carcass ply layer, wherein the carcass ply layer comprises a plurality of carcass cords and a topping rubber layer covering the plurality of carcass cords. The inner lining layer comprises a butyl rubber layer and an isolation rubber layer, wherein the isolation rubber layer is composed of a rubber having a higher adhesive force to the topping rubber layer than the adhesive force of the butyl rubber layer to the topping rubber layer. The butyl rubber layer is configured to form the inner cavity surface of the tire. The insulating rubber layer is disposed between the butyl rubber layer and the topping rubber layer and is partially disposed with a radial length smaller than that of the butyl rubber layer. The electronic component is disposed between the butyl rubber layer and the isolation rubber layer so as not to be in contact with the topping rubber layer.

2. The pneumatic tire according to claim 1, characterized in that The electronic components are covered with rubber, The shortest distance from the carcass cord to the electronic component is 0.5 mm to 1.8 mm.

3. The pneumatic tire according to claim 2, characterized in that: The shortest distance from the butyl rubber layer to the electronic component is 0.1 mm to 0.4 mm.

4. The pneumatic tire according to claim 1 or 2, characterized in that: The insulation rubber layer has a loss tangent value tanδ of 0.16 or less.

5. The pneumatic tire according to claim 1 or 2, characterized in that: The complex elastic modulus E* of the isolation rubber layer is greater than 4.0 MPa.

6. The pneumatic tire according to claim 1 or 2, characterized in that: The electronic component includes a metallic main body having an IC chip and an antenna extending in a spiral shape around the main body.

7. The pneumatic tire according to claim 6, characterized in that: The spiral outer diameter of the antenna is 1.8 mm to 2.0 mm.

8. The pneumatic tire according to claim 1 or 2, characterized in that: The pneumatic tire includes an electronic module including a covering rubber covering the electronic component. The bead portion includes a bead apex extending from the bead core toward the outside in the tire radial direction. A distance in the tire radial direction from an inner end of the electronic module in the tire radial direction to an outer surface of the bead core is 50% to 60% of a height of the bead apex in the tire radial direction.

9. The pneumatic tire according to claim 8, characterized in that: A distance (L2) in the tire radial direction from an outer end of the electronic module in the tire radial direction to an outer end of the bead apex in the tire radial direction is 25% to 35% of the height of the bead apex.

10. The pneumatic tire according to claim 1 or 2, characterized in that: The carcass includes a plurality of carcass cords and a carcass cord reference plane passing through ends of the plurality of carcass cords on the tire inner cavity surface side. The pneumatic tire includes an electronic module including a covering rubber covering the electronic component. The covering rubber includes an inner layer in contact with the butyl rubber layer, an outer layer in contact with the insulation rubber layer, and a boundary surface between the inner layer and the outer layer. A ratio (d1 / d2) of a first distance (d1) being the shortest distance from the boundary surface to the carcass cord reference plane and a second distance (d2) being the shortest distance from the boundary surface to the butyl rubber layer is 1.8 to 2.2.

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