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WO2019225374A1 - Pneu - Google Patents

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Publication number
WO2019225374A1
WO2019225374A1 PCT/JP2019/018909 JP2019018909W WO2019225374A1 WO 2019225374 A1 WO2019225374 A1 WO 2019225374A1 JP 2019018909 W JP2019018909 W JP 2019018909W WO 2019225374 A1 WO2019225374 A1 WO 2019225374A1
Authority
WO
WIPO (PCT)
Prior art keywords
belt
resin
tire
carcass
cord
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.)
Ceased
Application number
PCT/JP2019/018909
Other languages
English (en)
Japanese (ja)
Inventor
正之 有馬
哲史 上条
圭一 長谷川
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.)
Bridgestone Corp
Original Assignee
Bridgestone Corp
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 Bridgestone Corp filed Critical Bridgestone Corp
Publication of WO2019225374A1 publication Critical patent/WO2019225374A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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

Definitions

  • the present disclosure relates to a pneumatic tire having a belt provided with a resin layer.
  • a pneumatic tire As a pneumatic tire to be mounted on an automobile, there is a pneumatic tire provided with a belt configured to include a resin layer made of a thermoplastic resin on the outer side in the tire radial direction of the carcass (for example, Japanese Patent Application Laid-Open No. 2007-069745, JP, 2002-002220, A).
  • a carcass and a belt are joined as follows. An unvulcanized carcass covered with a cord with unvulcanized rubber is attached to the outer periphery of the first drum, and a cylindrical belt configured to include a resin layer is formed on the outer peripheral surface of the second drum. After the cylindrical belt removed from the second drum is disposed on the outer periphery side of the carcass, the carcass and the belt are joined to each other by expanding the carcass.
  • the belt is formed in a cylindrical shape on the outer peripheral surface of the second drum, and is removed from the second drum in a state in which the thermoplastic resin is cooled and hardened, and the outer peripheral side of the carcass formed on the first drum. Placed in.
  • the uncured carcass has a shape in which the diameter of the central portion in the width direction is the maximum and the diameter gradually decreases toward the outer side in the tire width direction when viewed in a cross section along the rotation axis. In other words, it is expanded so as to have a substantially arc shape.
  • the belt formed by the second drum has a constant diameter, or both ends are slightly curved inward in the tire radial direction, but the carcass expanded by the first drum faces the vicinity of both ends of the belt.
  • the degree of bending of the portion is larger than the degree of bending at both ends of the belt.
  • the central portion in the width direction of the extended carcass ply is joined to the central portion in the width direction of the belt, but the carcass does not contact both end portions of the belt, and there is a gap between the end portions of the belt and the carcass. May be formed.
  • the carcass even if the carcass contacts the entire inner peripheral surface of the belt when the carcass is expanded, if the carcass to which the belt is joined is removed from the first drum, the carcass is not vulcanized before being vulcanized by a vulcanizing machine. In some cases, the diameter is reduced and the carcass is peeled off from both ends of the belt, and a gap is formed between the both ends of the belt and the carcass.
  • the green tire formed by attaching the carcass joined with the belt and other various members is loaded into a vulcanization mold and vulcanized to become a product pneumatic tire.
  • the raw tire is vulcanized in a state where a gap is formed between the belt and the carcass, the air that has entered the gap does not escape and a product pneumatic tire that has become poorly filled is manufactured. End up.
  • the present disclosure is intended to provide a pneumatic tire that can suppress poor air entry in consideration of the above facts.
  • a pneumatic tire according to a first aspect includes a carcass straddling one bead portion to the other bead portion, a belt that is disposed on the outer side in the tire radial direction of the carcass and includes at least a resin layer, A gap filling member that fills a gap between both end portions in the tire width direction and the carcass.
  • the carcass ply 14 is formed by coating a plurality of cords (not shown) extending in the radial direction of the pneumatic tire 10 with a coating rubber (not shown). That is, the pneumatic tire 10 of the present embodiment is a so-called radial pneumatic tire.
  • the material of the cord of the carcass ply 14 is, for example, PET, but may be another conventionally known material.
  • the end portion in the tire width direction of the carcass ply 14 is folded back from the bead core 12 in the tire radial direction.
  • a portion extending from one bead core 12 to the other bead core 12 is called a main body portion 14 ⁇ / b> A
  • a portion folded from the bead core 12 is called a folded portion 14 ⁇ / b> B.
  • the cross-sectional shape of the main body portion 14A of the carcass ply 14 in the pneumatic tire 10 of the present embodiment is the same cross-sectional shape as that of a conventional general pneumatic tire, and the vicinity of the tire equatorial plane CL has a substantially constant radius and a flat shape. Yes, the radius gradually decreases near the shoulder.
  • a bead filler 18 whose thickness gradually decreases from the bead core 12 toward the outer side in the tire radial direction is disposed.
  • a bead portion 20 is a portion on the inner side in the tire radial direction from the tire radial direction outer end 18A of the bead filler 18.
  • An inner liner 22 made of rubber is disposed inside the pneumatic tire of the carcass 16.
  • a side rubber layer 24A is disposed on the outer side in the tire radial direction
  • a side rubber layer 24B is disposed on the inner side in the tire radial direction. Note that a part of the side rubber layer 24 ⁇ / b> B is folded back on the radially inner side of the bead core 12 and extends to a part of the tire inner surface.
  • a tire case 25 is configured by the bead core 12, the carcass 16, the bead filler 18, the inner liner 22, the side rubber layer 24A, and the side rubber layer 24B.
  • the tire case 25 is a pneumatic tire frame member that forms the frame of the pneumatic tire 10.
  • a belt 26 is provided on the outer side of the crown portion of the carcass 16, in other words, on the outer side in the tire radial direction of the carcass 16 to restrain the outer peripheral portion of the carcass 16 to obtain a tag effect.
  • the belt 26 of the present embodiment is substantially entirely formed when viewed in a cross section along the rotation axis.
  • the central portion in the tire width direction is formed in a straight line parallel to the tire rotation axis.
  • both end portions in the tire width direction are slightly curved inward in the tire radial direction.
  • the degree of curvature of both ends of the belt 26 in the tire width direction is smaller than the degree of curvature of the carcass 16. Therefore, most of the belt 26 is in close contact with the outer peripheral surface of the carcass 16 at the center in the tire width direction, but a part of both sides in the width direction is separated from the outer peripheral surface of the carcass 16.
  • the belt 26 of the present embodiment is formed by winding a plurality (two in the present embodiment) of reinforcing cords 30 around a resin-coated cord 34 covered with a resin 32. A method for manufacturing the belt 26 will be described later.
  • the reinforcing cord 30 of the belt 26 is preferably thicker than the cord of the carcass ply 14 and has a high strength (tensile strength).
  • the reinforcing cord 30 of the belt 26 can be composed of monofilament (single wire) such as metal fiber or organic fiber, or multifilament (twisted wire) obtained by twisting these fibers.
  • the reinforcing cord 30 of the present embodiment is a steel cord.
  • the resin 32 that covers the reinforcing cord 30 is made of a rubber material that forms the side rubber layers 24A and 24B and a resin material that has a higher tensile elastic modulus than a rubber material that forms a tread 36 described later.
  • an elastic thermoplastic resin, a thermoplastic elastomer (TPE), a thermosetting resin, or the like can be used as the resin 32 covering the reinforcing cord 30.
  • TPE thermoplastic elastomer
  • thermosetting resin or the like.
  • thermoplastic elastomers polyolefin-based thermoplastic elastomer (TPO), polystyrene-based thermoplastic elastomer (TPS), polyamide-based thermoplastic elastomer (TPA), polyurethane-based thermoplastic elastomer (TPU), polyester-based thermoplastic elastomer (TPC) And dynamic crosslinkable thermoplastic elastomer (TPV).
  • TPO polyolefin-based thermoplastic elastomer
  • TPS polystyrene-based thermoplastic elastomer
  • TPA polyamide-based thermoplastic elastomer
  • TPU polyurethane-based thermoplastic elastomer
  • TPC polyester-based thermoplastic elastomer
  • TPV dynamic crosslinkable thermoplastic elastomer
  • thermoplastic resin examples include polyurethane resin, polyolefin resin, vinyl chloride resin, polyamide resin and the like.
  • the deflection temperature under load (when 0.45 MPa is loaded) specified in ISO 75-2 or ASTM D648 is 78 ° C or higher
  • the tensile yield strength specified in JIS K7113 is 10 MPa.
  • JIS K7113 examples of the thermoplastic resin material
  • a tensile fracture elongation specified by JIS K7113 of 50% or more and a Vicat softening temperature (Method A) specified by JIS K7206 of 130 ° C. or more can be used.
  • the tensile elastic modulus (specified in JIS K7113: 1995) of the resin 32 covering the reinforcing cord 30 is preferably 50 MPa or more.
  • the upper limit of the tensile modulus of the resin 32 that covers the reinforcing cord 30 is preferably set to 1000 MPa or less.
  • the tensile elastic modulus of the resin 32 covering the reinforcing cord 30 is particularly preferably in the range of 200 to 500 MPa.
  • the thickness dimension of the belt 26 of this embodiment is preferably larger than the diameter dimension of the reinforcing cord 30.
  • the reinforcing cord 30 is preferably completely embedded in the resin 32.
  • the thickness of the belt 26 is preferably 0.70 mm or more.
  • the end portions 26A on both sides in the tire width direction of the belt 26 are separated from the carcass ply 14, and between the vicinity of the end portions 26A on both sides in the tire width direction (both end portions in the tire width direction) of the belt 26 and the carcass ply 14. Is formed with a substantially triangular gap that extends in the tire width direction, with the gap increasing from the tire equatorial plane CL side toward the end portion 26A side of the belt 26. This gap is a gap filling member 28 made of a rubber material. Filled with.
  • the vicinity of the end portion 26A in the tire width direction of the belt 26 is covered with a belt-like layer 38 from the outer side in the tire radial direction.
  • the layer 38 preferably covers at least the outermost reinforcing cord 30 in the tire width direction of the belt 26 from the outer side in the tire radial direction, and further preferably covers a curved portion of the belt 26.
  • the layer 38 covers the sixth resin-coated cord 34 from the outermost side in the tire width direction.
  • the layer 38 extends from the outer side in the tire width direction to the end portion 26A of the belt 26 so as to cover the end portion 26A of the belt 26 from the outer side in the tire width direction and to cover the end surface of the gap filling member 28.
  • the layer 38 for example, a plurality of cords (not shown) arranged in parallel and coated with rubber can be used.
  • the cord used for the layer 38 include an organic fiber cord and a steel cord.
  • a steel cord is used for the layer 38, a cord having a lower bending rigidity than that used for the belt 26, in other words, a cord thinner than that used for the belt 26 is used.
  • the layer 38 may use a woven fabric or a non-woven fabric made of fibers or the like instead of the cord.
  • the layer 38 may be a cord, woven fabric, or non-woven fabric coated with a resin.
  • the layer 38 may be composed of only a rubber material or a resin material.
  • the rubber material or resin material constituting the layer 38 has an intermediate tensile elastic modulus between the resin 32 covering the reinforcing cord 30 and the rubber material constituting the side rubber layer 24 and the rubber material constituting the tread 36. Is used.
  • the rigidity distribution When the rigidity distribution is viewed in the tire width direction, there is a large rigidity step between the belt 26 in which the reinforcing cord 30 is embedded and the tread 36 made of only rubber, in other words, there is a large difference in rigidity. Stress is likely to concentrate at a portion where the rigidity changes greatly, such as near the end portion 26A of the belt 26.
  • the end 26A of the belt 26 is covered with the layer 38, so that the rigidity can be gradually changed from the end 26A of the belt 26 to the tread 36 when viewed in the tire width direction. The concentration of stress in the vicinity of the end portion 26A can be suppressed.
  • the layer 38 covers only the vicinity of the end portion 26A of the belt 26. However, if necessary, the entire belt 26 is covered from the outside in the tire radial direction with at least one layer 38 formed wide. You may do it.
  • a tread 36 made of the second rubber material is disposed outside the belt 26 in the tire radial direction. Conventionally known materials are used as the second rubber material used for the tread 36. A drainage groove 37 is formed in the tread 36. Also, a conventionally known pattern for the tread 36 is used.
  • the width BW of the belt 26 measured along the tire axial direction is preferably 75% or more with respect to the contact width TW of the tread 36 measured along the tire axial direction.
  • the upper limit of the width BW of the belt 26 is preferably 110% with respect to the ground contact width TW.
  • the contact width TW of the tread 36 means that the pneumatic tire 10 is mounted on a standard rim stipulated by JATMA YEAR (BOOK (2018 version, Japan Automobile Pneumatic Tire Association Standard) and applied in JATMA YEAR BOOK. Filled with 100% internal pressure of the air pressure (maximum air pressure) corresponding to the maximum load capacity in the size / ply rating (bold load in the internal pressure-load capacity correspondence table), and the rotation axis is parallel to the horizontal flat plate in a stationary state. When the mass corresponding to the maximum load capacity is added. When the TRA standard or ETRTO standard is applied at the place of use or manufacturing, the respective standards are followed.
  • the in-plane shear rigidity of the belt 26 is preferably equal to or higher than that of a belt having a conventional structure in which a cord is covered with rubber.
  • the cross-sectional shape of the unvulcanized gap filling member 28 applied here is substantially the same as that of the vulcanized gap filling member 28 in the pneumatic tire 10 as the product shown in FIG.
  • the unvulcanized gap filling member 28 may have a sheet shape with a certain thickness.
  • the belt 26 is formed by spirally winding a resin-coated cord 34 in which two reinforcing cords 30 are coated with a coating resin 32 around a belt-forming drum 40.
  • the cross-sectional shape of the resin-coated cord 34 according to the present embodiment is a rectangle (horizontal width rectangle), but the resin-coated cord 34 may be any cross-sectional shape that is joined adjacent to each other. It may be a shape.
  • the cord supply device 42, the heating device 50, the pressing roller 60, and the cooling roller 70 are movably disposed in the vicinity of the belt forming drum 40.
  • the axially central region is formed to have a constant diameter. However, in the axially opposite regions, the diameter is gradually reduced toward the outer side in the axial direction. (In FIG. 2, only a part of the belt forming drum 40 is shown, and the reduced diameter part is omitted).
  • the cord supply device 42 guides a reel 43 around which a resin-coated cord 34 obtained by coating the reinforcing cord 30 with a coating resin 32 is wound, and a resin-coated cord 34 unwound from the reel 43 to the outer periphery of the belt forming drum 40. And a guide member 44 for doing so.
  • the guide member 44 has a cylindrical shape, and the resin-coated cord 34 passes therethrough. Further, the resin-coated cord 34 is sent out from the mouth portion 46 of the guide member 44 toward the outer peripheral surface of the belt forming drum 40.
  • the heating device 50 blows hot air on the resin-coated cord 34 to heat and melt the blown portion.
  • air heated by a heating wire (not shown) is blown out from the outlet 52 with an air flow generated by a fan (not shown), and the hot air blown out is blown against the resin-coated cord 34.
  • the structure of the heating apparatus 50 is not limited to the said structure, What kind of structure may be sufficient if a thermoplastic resin can be heat-melted.
  • a hot metal may be brought into contact with the side surface of the resin-coated cord 34 to heat and melt the side surface, may be heated and melted by radiant heat, or may be heated and melted by irradiation with infrared rays.
  • the pressing roller 60 presses a resin-coated cord 34, which will be described later, against the outer peripheral surface of the belt forming drum 40, so that the pressing force F can be adjusted. Further, the roller surface of the pressing roller 60 is processed to prevent adhesion of a molten resin material.
  • the pressing roller 60 is rotatable, and in a state where the resin-coated cord 34 is pressed against the outer periphery of the belt forming drum 40, the pressing roller 60 is driven to rotate with respect to the rotation direction (arrow A direction) of the belt forming drum 40. It is like that.
  • the cooling roller 70 is disposed downstream of the pressing roller 60 in the rotation direction of the belt forming drum 40, and cools the resin covering cord 34 while pressing the resin covering cord 34 against the outer peripheral surface of the belt forming drum 40. is there. As with the pressing roller 60, the cooling roller 70 can adjust the pressing force and is processed to prevent adhesion of a molten resin material to the roller surface. Further, the cooling roller 70 is rotatable like the pressing roller 60, and in the state where the resin-coated cord 34 is pressed against the outer peripheral surface of the belt forming drum 40, the rotation direction of the belt forming drum 40 (arrow A) Direction).
  • the cooling roller 70 is configured such that a liquid (for example, water) circulates inside the roller, and a member (resin-coated cord 34 in the present embodiment) that contacts the roller surface by heat exchange of the liquid. Can be cooled. Note that the cooling roller 70 may be omitted when the molten resin material is naturally cooled.
  • the belt forming drum 40 is rotated in the direction of arrow A, and the resin-coated cord 34 is sent out from the mouth 46 of the cord supply device 42 toward the outer peripheral surface of the belt forming drum 40.
  • the belt 26 is formed on the outer peripheral surface of the belt forming drum 40 by winding the resin-coated cord 34 spirally around the outer peripheral surface of the belt forming drum 40 and pressing it on the outer peripheral surface.
  • the position of the mouth 46 of the cord supply device 42 is moved in the tire axial direction as the tire case 17 rotates, or the tire case 17 is moved in the tire axial direction. You can move it.
  • the belt 26, which has been cooled and solidified by the resin 32, is removed from the belt forming drum 40 and placed outside the tire case 25 in the radial direction of the tire forming drum, and pressure is applied from the inside to apply the unvulcanized tire case 25. Expand.
  • the outer peripheral surface of the tire case 25, in other words, the outer peripheral surface of the carcass 16 and the outer peripheral surface of the gap filling member 28 are pressure-bonded to the inner peripheral surface of the belt 26.
  • a layer 38 is pasted so as to cover both ends of the belt 26.
  • the unvulcanized tread 36 is attached to the outer peripheral surface of the belt 26 in the same manner as in the production of a general pneumatic tire, and the raw tire is completed.
  • the raw tire produced in this way is vulcanized and molded with a vulcanization mold in the same manner as a general pneumatic tire, and the pneumatic tire 10 is completed.
  • the pneumatic tire 10 of the present embodiment has a cross-sectional shape that is formed so as to increase in thickness from the tire equatorial plane CL side toward the end portion 26 ⁇ / b> A side of the belt 26 on the radially inner side of both end portions of the belt 26.
  • a triangular gap filling member 28 is arranged.
  • the gap filling member 28 can be formed of, for example, rubber having a loss factor larger than that of the rubber constituting the tread 36, or can be formed of rubber having a larger tensile elastic modulus than that of the rubber constituting the tread 36. Various characteristics of rubber can be used depending on the performance required for the tire 10.
  • the gap filling member 28 may include a reinforcing fiber material or the like. Further, the gap filling member 28 may be made of a resin similar to the resin used for the belt 26, for example.
  • the gap filling member 28 When the gap filling member 28 is formed of rubber, the rubber is bonded to the carcass 16 whose cord is covered with rubber, and the bonding strength between the gap filling member 28 and the carcass 16 can be increased. On the other hand, if the gap filling member 28 is formed of resin, the resin of the belt 26 is bonded to each other, and the bonding strength between the gap filling member 28 and the belt 26 can be increased.
  • the crown portion of the carcass 16 is reinforced by the belt 26 in which the reinforcing cord 30 wound spirally is covered with the resin 32.
  • the belt is lighter and easier to manufacture.
  • the tensile elastic modulus of the resin 32 covering the reinforcing cord 30 is 50 MPa or more and the thickness is 0.7 mm or more, in-plane shearing of the belt 26 in the tire width direction is achieved. Sufficient rigidity can be ensured.
  • the buckling of the tread 36 (the surface of the tread 36 undulates and a part thereof is separated from the road surface). Phenomenon).
  • the belt 26 having high in-plane shear rigidity is used, and the width BW of the belt 26 is set to 75% or more of the ground contact width TW of the tread 36. Can be increased.
  • the thickness of the belt 26 can be reduced as compared with the case where the belt 26 is constituted by two or more conventional belt plies.
  • the thickness can be increased and the depth of the groove 37 can be increased. Thereby, the lifetime of the pneumatic tire 10 can be extended.
  • the belt 26 in the pneumatic tire 10 has a reinforcing cord 30 spirally wound, and there is no portion where the reinforcing cord 30 overlaps in the tire radial direction on the circumference, and the thickness is uniform in the circumferential direction of the pneumatic tire. Therefore, the pneumatic tire 10 is excellent in uniformity.
  • the thickness t of the belt 26 in other words, the thickness of the resin 32 is less than 0.7 mm, there is a possibility that the reinforcing cord 30 embedded in the resin 32 is thickened and the tag effect cannot be obtained.
  • the width BW of the belt 26 is less than 75% with respect to the ground contact width TW of the tread 36, the tagging effect of the belt 26 becomes insufficient, and it becomes difficult to suppress the generation of noise near the shoulder 39. There is a fear.
  • the width BW of the belt 26 exceeds 110% with respect to the ground contact width TW of the tread 36, the tagging effect will reach a peak state, the belt 26 becomes more than necessary, and the weight of the pneumatic tire 10 increases.
  • the belt 26 of the present embodiment is formed in a linear shape in which the center portion in the tire width direction is parallel to the tire rotation axis, and both end portions in the tire width direction are slightly curved inward in the tire radial direction.
  • the belt 26 may be formed with a constant diameter from one end to the other end in the tire width direction as necessary.
  • the belt 26 can be formed by winding the resin-coated cord 34 around the outer periphery of the belt forming drum 40 having a constant diameter from one end side in the axial direction to the other end side.
  • the belt 26 of the pneumatic tire 10 of the present embodiment includes a rubber-coated spiral belt 72 formed by winding a reinforcing cord 30 wound in a spiral and covered with rubber, and a rubber-coated spiral.
  • a resin layer 27 made of only a resin material integrated on the carcass 16 side of the belt 72 is included.
  • reference numeral 74 denotes rubber that covers the reinforcing cord 30.
  • a cylindrical resin layer 27 is disposed on the outer periphery of the belt forming drum, and the outer peripheral surface of the resin layer 27 is covered with a rubber (unvulcanized) reinforcing cord 30 in a spiral shape.
  • the resin layer 27 and the rubber-coated spiral belt 72 are integrated on the outer periphery of the belt forming drum.
  • the belt 26 of the belt 26 is compared with the case where the resin layer 27 is not provided.
  • the in-plane shear rigidity can be increased.
  • the same resin material as the resin 32 of the resin-coated cord 34 of the first embodiment can be used, but a different type of resin material from the resin 32 of the first embodiment is used. It may be used.
  • both ends of the belt 26 of this embodiment are curved, that is, both ends of the rubber-coated spiral belt 72 and the resin layer 27 are curved.
  • the belt 26 according to the present embodiment including the resin layer 27 may also be formed with a constant diameter from one end in the width direction toward the other end.
  • the resin layer 27 can be injection-molded, but if it has a constant diameter, the extruded resin cylinder may be cut into a predetermined length and used as long as it can be formed as a resin cylinder. .
  • the belt 26 of the present embodiment can be formed by winding a rubber-coated reinforcing cord 30 around the outer peripheral surface of the cylindrical resin layer 27 in a spiral manner, so that the outer peripheral surface of the belt-forming drum is covered with rubber.
  • a rubber-coated reinforcing cord 30 around the outer peripheral surface of the cylindrical resin layer 27 in a spiral manner, so that the outer peripheral surface of the belt-forming drum is covered with rubber.
  • the reinforcing cord 30 is directly wound, there is a goal of winding with a predetermined width. Therefore, it is easy to wind the rubber-coated reinforcing cord 30, and the cylindrical belt 26 excellent in uniformity is provided. It can be formed easily.
  • the belt 26 of the pneumatic tire 10 of the present embodiment has the resin layer 27 integrated with a rubber-coated spiral belt 72 formed by spirally winding a rubber-coated reinforcing cord 30, Similar to the belt 26 of the pneumatic tire 10 of one embodiment, the out-of-plane bending rigidity can be increased.
  • the resin-coated cord 34 used in manufacturing the belt 26 is obtained by coating the two reinforcing cords 30 with the resin 32.
  • the resin-coated cord 34 has one reinforcing cord.
  • the cord 30 may be covered with a resin 32, or three or more reinforcing cords 30 may be covered with a resin 32.
  • the belt 26 only needs to include at least a resin layer continuous from one end side to the other end side in the width direction, and the arrangement of the cord, the thickness of the layer, and the like are not limited to those of the above embodiment. Further, the belt 26 may not include the reinforcing cord 30 (that is, only the resin layer) or may be a belt-like metal plate as long as strength is ensured.
  • the structure of the present invention can be applied to a run-flat pneumatic tire whose side portions are reinforced with a reinforcing rubber, and can also be applied to a pneumatic tire mounted on a vehicle other than a passenger vehicle.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Abstract

Ce pneu a une carcasse s'étendant d'une section de talon à une autre section de talon, une ceinture disposée sur le côté extérieur de la carcasse dans la direction du diamètre du pneu et conçue de manière à comprendre au moins une couche de résine, et des éléments de remplissage d'espace qui remplissent des espaces entre la carcasse et les deux parties d'extrémité de la courroie.
PCT/JP2019/018909 2018-05-23 2019-05-13 Pneu Ceased WO2019225374A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018098744A JP2019202638A (ja) 2018-05-23 2018-05-23 空気入りタイヤ
JP2018-098744 2018-05-23

Publications (1)

Publication Number Publication Date
WO2019225374A1 true WO2019225374A1 (fr) 2019-11-28

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PCT/JP2019/018909 Ceased WO2019225374A1 (fr) 2018-05-23 2019-05-13 Pneu

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WO (1) WO2019225374A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3805015A4 (fr) * 2018-05-31 2022-03-16 Bridgestone Corporation Bandage pneumatique

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021088789A (ja) * 2019-12-05 2021-06-10 株式会社ブリヂストン 繊維、樹脂被覆コードの製造方法、空気入りタイヤの製造方法

Citations (5)

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Publication number Priority date Publication date Assignee Title
JPH11170808A (ja) * 1997-12-15 1999-06-29 Yokohama Rubber Co Ltd:The 空気入りタイヤ
JP2008087710A (ja) * 2006-10-04 2008-04-17 Bridgestone Corp 重荷重用空気入りラジアルタイヤ
JP2015515412A (ja) * 2012-04-06 2015-05-28 コンパニー ゼネラール デ エタブリッスマン ミシュラン ラジアル又はクロスプライカーカスを備えたタイヤ
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