WO2025089118A1 - 空気入りタイヤ及びその製造方法 - Google Patents

空気入りタイヤ及びその製造方法 Download PDF

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Publication number
WO2025089118A1
WO2025089118A1 PCT/JP2024/036473 JP2024036473W WO2025089118A1 WO 2025089118 A1 WO2025089118 A1 WO 2025089118A1 JP 2024036473 W JP2024036473 W JP 2024036473W WO 2025089118 A1 WO2025089118 A1 WO 2025089118A1
Authority
WO
WIPO (PCT)
Prior art keywords
tire
layer
sealant
pneumatic tire
sealant layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/JP2024/036473
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English (en)
French (fr)
Japanese (ja)
Inventor
雅公 成瀬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yokohama Rubber Co Ltd
Original Assignee
Yokohama Rubber Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yokohama Rubber Co Ltd filed Critical Yokohama Rubber Co Ltd
Priority to JP2025553164A priority Critical patent/JPWO2025089118A1/ja
Publication of WO2025089118A1 publication Critical patent/WO2025089118A1/ja
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C19/00—Tyre parts or constructions not otherwise provided for
    • B60C19/12—Puncture preventing arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C5/00—Inflatable pneumatic tyres or inner tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
    • B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
    • B60C9/22—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/12—Materials for stopping leaks, e.g. in radiators, in tanks

Definitions

  • the present invention relates to a pneumatic tire with a sealant layer on the inner surface of the tread portion and a manufacturing method thereof. More specifically, the present invention relates to a pneumatic tire and a manufacturing method thereof that, by improving the carcass structure, ensures sufficient tire gauge in the shoulder portion and achieves both tire durability and puncture sealing properties.
  • the object of the present invention is to provide a pneumatic tire and a manufacturing method thereof that, by improving the carcass structure, ensures sufficient tire gauge in the shoulder area and achieves both tire durability and puncture sealing.
  • the method for manufacturing a pneumatic tire of the present invention to achieve the above object is a method for manufacturing the above-mentioned pneumatic tire, characterized in that after manufacturing the pneumatic tire excluding the sealant layer, when applying a sealant to the inner surface of the tire in the tread portion to form the sealant layer, the temperature of the sealant applied to the inner surface of the tire is set to 70°C or less.
  • the end of the wound up portion of the carcass layer is located inside the end of the belt layer in the tire width direction, so that the number of components in the shoulder portion can be increased, and the tire gauge of the shoulder portion can be increased, improving the durability of the tire and suppressing the amount of air leakage in the shoulder portion even if a nail is inserted and then removed.
  • the end of the sealant layer in the tire width direction is located in the shoulder portion and is located outside the end of the wound up portion of the carcass layer in the tire width direction, so that puncture sealing in the shoulder portion can be sufficiently ensured without taking measures such as increasing the thickness of the sealant layer.
  • a belt cover layer is provided on the tire outer peripheral side of the belt layer, and that the belt cover layer is arranged so as to cover at least the end of the belt layer in the tire width direction. This can further improve the durability of the tire, and can also further improve puncture sealing properties by suppressing the amount of air leakage from the shoulder portion even if a nail is pierced.
  • the glass transition temperature of the sealant in the sealant layer is preferably in the range of -120°C to -40°C.
  • the sealant in the sealant layer is preferably composed of a silicone-based composition. This allows the sealant layer to adhere well to the inner surface of the tire even if the inner surface of the tire contains a release component, since the composition is made of the same material.
  • the silicone-based composition is preferably a two-component curing silicone.
  • Two-component curing silicone has low viscosity immediately after mixing the two components, so it can be applied even at low temperatures.
  • the distance L from the belt layer to the sealant layer is 10 mm or less at all points of the belt layer located at the innermost side in the tire radial direction. This makes it easier for the sealant to flow into the belt layer when a foreign object such as a nail penetrates the tread portion, ensuring good puncture sealing properties.
  • a sound-absorbing material is installed along the tire circumferential direction on the radially inner side of the sealant layer. This allows the sound-absorbing material to be installed on the sealant layer.
  • FIG. 1 is a meridian cross-sectional view showing a pneumatic tire according to an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view showing a main part of the pneumatic tire of FIG.
  • FIG. 3 is a cross-sectional view showing an example of a method for manufacturing a pneumatic tire according to an embodiment of the present invention.
  • FIG. 4 is a plan view showing a sealant layer formed on the inner surface of the tire in the tread portion of the pneumatic tire of FIG.
  • FIG. 5 is a cross-sectional view showing a main portion of a pneumatic tire according to another embodiment of the present invention.
  • FIG. 6 is a meridian cross-sectional view showing a pneumatic tire according to another embodiment of the present invention.
  • FIG. 7 is a meridian cross-sectional view showing a pneumatic tire having a conventional carcass structure.
  • Figures 1 and 2 show a pneumatic tire according to an embodiment of the present invention.
  • the pneumatic tire of this embodiment has a tread portion 1 that extends in the circumferential direction of the tire to form an annular shape, a pair of sidewall portions 2 arranged on both sides of the tread portion 1, and a pair of bead portions 3 arranged radially inward of the sidewall portions 2.
  • At least one carcass layer 4 (one layer in FIG. 1) is mounted between a pair of bead portions 3, and is made up of multiple carcass cords arranged in the radial direction.
  • Organic fiber cords such as nylon and polyester are preferably used as the carcass cords that make up the carcass layer 4.
  • An annular bead core 5 is embedded in each bead portion 3, and a bead filler 6 made of a rubber composition with a triangular cross section is arranged on the outer periphery of the bead core 5.
  • the belt layer 7 includes multiple reinforcing cords that are inclined with respect to the tire circumferential direction, and are arranged so that the reinforcing cords cross each other between layers.
  • the inclination angle of the reinforcing cords with respect to the tire circumferential direction is set in the range of 10° to 40°, for example.
  • Steel cords are preferably used as the reinforcing cords of the belt layer 7.
  • At least one belt cover layer 8 (two layers in FIG. 1) is arranged on the outer circumferential side of the belt layer 7, and is made of reinforcing cords arranged at an angle of, for example, 5° or less relative to the tire circumferential direction, with the aim of improving high-speed durability.
  • This belt cover layer 8 is preferably a jointless structure in which a strip material made of at least one reinforcing cord aligned and rubber-coated is continuously wound at an angle of substantially 0° relative to the tire circumferential direction.
  • organic fiber cords such as nylon or aramid are preferably used.
  • both ends 4e of the carcass layer 4 are folded back around each bead core 5 from the inside to the outside of the tire, and are arranged to encase the bead cores 5 and the bead fillers 6.
  • the carcass layer 4 includes a main body portion 4A that is a portion that extends from the tread portion 1 through each sidewall portion 2 to each bead portion 3, and a rolled-up portion 4B that is a portion that is rolled up around the bead core 5 in each bead portion 3 and extends toward each sidewall portion 2.
  • the end 4e of the rolled-up portion 4B of the carcass layer 4 is arranged between the main body portion 4A of the carcass layer 4 and the belt layer 7. In other words, the end 4e of the rolled-up portion 4B of the carcass layer 4 is arranged inside the end portion 7e of the belt layer 7 in the tire width direction.
  • the end 4e of the turned-up portion 4B of the carcass layer 4 located at the outermost side in the tire width direction in the sidewall portion 2 may be structured to be disposed between the main body portion 4A of the carcass layer 4 and the belt layer 7.
  • the sealant layer 20 is formed continuously in the tire circumferential direction on the tire inner surface 10 in the tread portion 1.
  • the center position of the sealant layer 20 in the tire width direction preferably coincides with the tire equator, but the center position may be shifted from the tire equator to either side in the tire width direction.
  • the distance in the tire width direction between the center position of the sealant layer 20 in the tire width direction and the tire equator is preferably 10 mm or less, more preferably 5 mm or less. This prevents the sealant layer 20 from adversely affecting the tire balance.
  • the sealant of the sealant layer 20 can be composed of, for example, a diene rubber or a silicone-based composition.
  • the silicone-based composition may include a synthetic polymer compound having a main skeleton formed by a siloxane bond.
  • the end 20e in the tire width direction of the sealant layer 20 is located in the shoulder portion Sh and is arranged outside the end 4e of the rolled-up portion 4B of the carcass layer 4 in the tire width direction.
  • the shoulder portion Sh refers to a region of 20 mm on either side of a perpendicular line x drawn from the end 7e of the belt layer 7 located at the innermost position in the tire radial direction to the tire inner surface 10.
  • the end 4e of the rolled-up portion 4B of the carcass layer 4 is located inward in the tire width direction from the end 7e of the belt layer 7, so that the number of components in the shoulder portion Sh can be increased, and the tire gauge of the shoulder portion Sh can be increased, improving the durability of the tire, and even if a nail is inserted and then removed, the amount of air leakage in the shoulder portion Sh can be suppressed.
  • the end 20e in the tire width direction of the sealant layer 20 is located in the shoulder portion Sh and is located outward in the tire width direction from the end 4e of the rolled-up portion 4B of the carcass layer 4, so that the puncture sealing performance in the shoulder portion Sh can be sufficiently ensured without taking measures such as increasing the thickness of the sealant layer 20.
  • the tire gauge of the shoulder portion Sh can be sufficiently ensured, and both the durability and puncture sealing performance of the tire can be achieved.
  • the glass transition temperature of the sealant in the sealant layer 20 is preferably in the range of -120°C to -40°C.
  • the above-mentioned pneumatic tire can be manufactured by the following method. First, a pneumatic tire is manufactured, as described above, which includes the tread portion 1, a pair of sidewall portions 2, a pair of bead portions 3, a carcass layer 4, and a belt layer 7, and the end 4e of the turned-up portion 4B of the carcass layer 4 is disposed inward in the tire width direction from the end 7e of the belt layer 7. Next, a sealant made of a diene-based rubber or a silicone-based composition is applied to the tire inner surface 10 of the tread portion 1 to form a sealant layer 20.
  • the end 20e of the sealant layer 20 in the tire width direction is disposed in the shoulder portion Sh, outward in the tire width direction from the end 4e of the turned-up portion 4B of the carcass layer 4.
  • the silicone-based composition has good fluidity even at low temperatures, so the temperature of the sealant applied to the tire inner surface 10 is set to 70°C or less. If this temperature exceeds 70°C, the process of applying the sealant to the tire inner surface 10 causes a large distortion in the pneumatic tire, and the durability of the tire deteriorates.
  • the temperature of the sealant when applied to the tire inner surface 10 is preferably in the range of 5°C to 40°C, more preferably in the range of 10°C to 35°C, and most preferably in the range of 15°C to 30°C.
  • FIG. 3 shows a specific manufacturing method of a pneumatic tire according to an embodiment of the present invention
  • FIG. 4 shows a sealant layer formed on the inner surface of the tire in the tread portion.
  • a sealant extrusion device 31 mixes sealants supplied from pumps 32 and 33, and continuously discharges the mixed sealant from a nozzle 34 as a strip 21.
  • This sealant extrusion device 31 is configured so that the position of the nozzle 34 can be freely changed.
  • the sealant strip 21 can be arranged in a spiral shape on the inner surface 10 of the tire while inclining with respect to the tire circumferential direction Tc (see FIG. 4).
  • the spirally arranged sealant strip 21 has its circumferential portions in close contact with each other.
  • the sealant strip 21 arranged in a spiral shape is integrated to form the sealant layer 20.
  • one-component curing silicone or two-component curing silicone can be used, but it is particularly preferable to use two-component curing silicone.
  • One-component curing silicone can be, for example, moisture-curing silicone.
  • Two-component curing silicone is composed of a first liquid and a second liquid, and a curing reaction begins by mixing these first and second liquids, and the stability of the sealant layer 20 is ensured after curing.
  • the first and second liquids of the two-component curing silicone are supplied from pumps 32 and 33, respectively.
  • Two-component curing silicone has a low viscosity immediately after mixing the two liquids, so it can be applied even at low temperatures.
  • Two-component curing silicones are composed of, for example, a condensation curable silyl-terminated polymer, a silane crosslinker, a condensation catalyst, and a filler.
  • condensation curable silyl-terminated polymers include polydialkylsiloxanes, alkylphenylsiloxanes, organic polymers having silyl groups (e.g., silyl polyethers, silyl acrylates), and polyisobutylenes having silyl groups.
  • silane crosslinkers include alkoxy-functional silanes, oximosilanes, acetoxysilanes, and enoxysilanes.
  • fillers include iron oxide, titanium dioxide, carbon black, and talc.
  • condensation catalysts include titanates and zirconates. These condensation curable silyl-terminated polymers, silane crosslinkers, condensation catalysts, and fillers are stored in a state where they are separated into a first liquid and a second liquid in a combination that does not cause a curing reaction to proceed, and are mixed when used.
  • two-component curing silicones include those described in Japanese Patent Publication No. 2018-503725 and Japanese Patent Publication No. 2022-550962.
  • SST-2650 manufactured by Dow can be used as a commercially available two-component curing silicone.
  • the belt cover layer 8 located on the inner side in the tire radial direction constitutes a full cover that covers the entire area of the belt layer 7, and the belt cover layer 8 located on the outer side in the tire radial direction constitutes an edge cover that covers only the edge portions of the belt layer 7.
  • the thickness S of the sealant layer 20 is preferably in the range of 2.0 mm to 5.0 mm. This ensures sufficient puncture sealing in the center as well as in the shoulder portion Sh. If the thickness S of the sealant layer 20 is less than 2.0 mm, the puncture sealing performance is reduced, and if it is greater than 5.0 mm, the sealant layer 20 will flow due to the centrifugal force of the tire, and the balance of the tire during running will deteriorate.
  • the thickness S of the sealant layer 20 is the overall average thickness.
  • the average thickness of the sealant layer 20 can be calculated, for example, by taking a tire meridian cross section at eight points around the tire circumference using a CT scan, and measuring the thickness of the sealant layer 20 at five points in each image taken: the tire equator position, the outer edge positions (both sides) 10 mm inward in the tire width direction from the end 20e of the sealant layer 20, and the intermediate positions (both sides) between the tire equator position and the outer edge position.
  • the distance (shortest distance) L from the belt layer 7 to the sealant layer 20 is 10 mm or less at all points of the belt layer 7 located at the innermost side in the tire radial direction. This makes it easier for the sealant to flow into the belt layer 7 when a foreign object such as a nail penetrates the tread portion 1, thereby ensuring good puncture sealing properties. If there is a part where the distance L from the belt layer 7 to the sealant layer 20 is greater than 10 mm, there is a risk that the puncture sealing properties in that part will be insufficient.
  • FIG. 5 shows a pneumatic tire according to another embodiment of the present invention.
  • the end 20e of the sealant layer 20 in the tire width direction is located in the shoulder portion Sh, and is disposed between the terminal 4e of the turned-up portion 4B of the carcass layer 4 and the end 7e of the belt layer 7.
  • the area where the sealant layer 20 is disposed on the tire inner surface 10 is small as possible, an increase in tire weight is suppressed and adverse effects on tire durability are avoided.
  • FIG. 6 shows a pneumatic tire according to another embodiment of the present invention.
  • a sound-absorbing material 40 is installed along the tire circumferential direction on the tire radial inside of the sealant layer 20.
  • the sound-absorbing material 40 is made of a porous material having open cells, and has a predetermined sound-absorbing characteristic based on its porous structure. Polyurethane foam is preferably used as the porous material of the sound-absorbing material 40.
  • the sound-absorbing material 40 is attached onto the sealant layer 20 based on the adhesiveness of the sealant layer 20.
  • the sound-absorbing material 40 is installed on the sealant layer 20 applied at a low temperature, so that damage to the sound-absorbing material 40 can be avoided and its sound-absorbing effect can be well maintained.
  • a pneumatic tire with a tire size of 255/45R19 which has a tread portion extending in the tire circumferential direction to form a ring, a pair of sidewall portions arranged on both sides of the tread portion, and a pair of bead portions arranged on the tire radially inward side of these sidewall portions, at least one carcass layer is mounted between the pair of bead portions, a belt layer is arranged on the outer periphery of the carcass layer in the tread portion, and the carcass layer is wound up around the bead cores of the bead portions from the inside to the outside of the tire, a sealant layer is formed on the inner surface of the tire in the tread portion, and tires of the conventional example and examples 1 to 8 were manufactured with the carcass layer structure, belt cover layer structure, sealant layer thickness, sealant type, and distance L set as shown in Table 1.
  • Belt cover layer structure means that the structure includes edge covers that cover only the edges on both sides of the belt layer in the tire width direction
  • Entire area means that the structure includes full covers that cover the entire area of the belt layer in the tire width direction
  • Puncture sealing Each test tire was mounted on a wheel with a rim size of 19 x 8.5J, and a nail with a diameter of 4 mm was driven into the shoulder part under conditions of an initial air pressure of 250 kPa and a temperature of 23°C. The nail was then removed and the tire was left for two weeks, after which the air pressure was measured.
  • the evaluation results were expressed as an index using the reciprocal of the measured value, with the conventional example being set at 100. The higher the index value, the better the puncture sealing property.
  • the pneumatic tires of Examples 1 to 8 had improved durability and puncture sealing performance compared to the conventional tire.
  • the pneumatic tire of Example 6 had a relatively thick sealant layer, which resulted in a deterioration in ride comfort.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Tires In General (AREA)
PCT/JP2024/036473 2023-10-24 2024-10-11 空気入りタイヤ及びその製造方法 Pending WO2025089118A1 (ja)

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JP2023-182523 2023-10-24

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006231980A (ja) * 2005-02-22 2006-09-07 Bridgestone Corp タイヤ粒子集合体
JP2017052512A (ja) * 2016-12-12 2017-03-16 住友ゴム工業株式会社 空気入りタイヤ
JP2022029222A (ja) * 2020-08-04 2022-02-17 横浜ゴム株式会社 粘着性シーラント材
JP2022062978A (ja) * 2020-10-09 2022-04-21 横浜ゴム株式会社 空気入りタイヤ
CN114953546A (zh) * 2021-02-23 2022-08-30 诺基安伦卡特股份有限公司 用于将密封剂施加到充气轮胎的内表面的方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006231980A (ja) * 2005-02-22 2006-09-07 Bridgestone Corp タイヤ粒子集合体
JP2017052512A (ja) * 2016-12-12 2017-03-16 住友ゴム工業株式会社 空気入りタイヤ
JP2022029222A (ja) * 2020-08-04 2022-02-17 横浜ゴム株式会社 粘着性シーラント材
JP2022062978A (ja) * 2020-10-09 2022-04-21 横浜ゴム株式会社 空気入りタイヤ
CN114953546A (zh) * 2021-02-23 2022-08-30 诺基安伦卡特股份有限公司 用于将密封剂施加到充气轮胎的内表面的方法

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