WO2011030765A1 - Tringle de talon pour pneu et pneu utilisant la tringle de talon - Google Patents

Tringle de talon pour pneu et pneu utilisant la tringle de talon Download PDF

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Publication number
WO2011030765A1
WO2011030765A1 PCT/JP2010/065345 JP2010065345W WO2011030765A1 WO 2011030765 A1 WO2011030765 A1 WO 2011030765A1 JP 2010065345 W JP2010065345 W JP 2010065345W WO 2011030765 A1 WO2011030765 A1 WO 2011030765A1
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WO
WIPO (PCT)
Prior art keywords
bead
cord
bead core
pneumatic tire
winding
Prior art date
Application number
PCT/JP2010/065345
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English (en)
Japanese (ja)
Inventor
雅典 八木田
光久 川口
誠明 野村
三代志 緑川
Original Assignee
不二精工株式会社
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 不二精工株式会社 filed Critical 不二精工株式会社
Priority to CN201080040155.8A priority Critical patent/CN102481813B/zh
Publication of WO2011030765A1 publication Critical patent/WO2011030765A1/fr

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    • 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)
    • B29D30/48—Bead-rings or bead-cores; Treatment thereof prior to building the tyre
    • 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)
    • B29D30/48—Bead-rings or bead-cores; Treatment thereof prior to building the tyre
    • B29D30/50—Covering, e.g. by winding, the separate bead-rings or bead-cores with textile material, e.g. with flipper strips
    • 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
    • B60C15/04—Bead cores

Definitions

  • the present invention relates to a bead core configured in an annular shape by winding a single bead wire a plurality of times, and a pneumatic tire using the bead core.
  • FIG. 13 is a meridional sectional view of a bead portion in a general pneumatic tire.
  • a bead portion 40 shown in FIG. 13 is a portion provided on the inner side in the tire radial direction of a sidewall portion (not shown), and includes a bead core 100 and a bead filler 110.
  • the bead core 100 has a so-called single wind structure in which a single bead wire 120 is wound a plurality of times to form an annular shape.
  • a cross-sectional shape obtained by cutting the bead core 100 along a plane orthogonal to the circumferential direction of the bead core 100 has, for example, a hexagonal shape as shown in FIG.
  • the bead filler 110 is a rubber material for reinforcing the bead core 100.
  • a pair of bead portions 40 configured as described above are provided so as to be symmetric about the tire equatorial plane.
  • a carcass 50 is wound around the pair of bead portions 40, 40 in a toroidal shape.
  • the carcass 50 is formed by arranging a plurality of carcass cords in parallel and covering them with a rubber material, and both ends thereof are arranged around the bead core 100 from the inner side in the tire width direction to the outer side in the tire width direction as shown in FIG. Wrapped towards.
  • FIG. 14 is a perspective view showing a part of the bead core 100 shown in FIG.
  • the bead core 100 has a structure in which the winding start end portion 150 and the winding end end portion 160 of the bead wire 120 are wound so as to overlap each other as shown in FIG.
  • a bead wire fastening cord 140 (hereinafter abbreviated as “fastening cord”) is spirally wound around a region where the winding start end portion 150 and the winding end portion 160 overlap and in the vicinity thereof.
  • fastening cord is spirally wound around a region where the winding start end portion 150 and the winding end portion 160 overlap and in the vicinity thereof.
  • FIG. 15 is a diagram schematically showing the vicinity of the stepped portion 170 of the bead core 100.
  • reference numerals 50a and 50A indicated by broken lines are a plurality of carcass cords constituting the carcass 50 shown in FIG.
  • the carcass 50 is folded back from the inner side in the tire width direction toward the outer side in the tire width direction so as to be in contact with the inner peripheral surface of the bead core 100, but on the inner peripheral surface of the bead core 100.
  • the stepped portion 170 since the stepped portion 170 is formed, a gap is generated between the carcass 50 and the bead core 100 in the stepped portion 170. That is, as shown in FIG. 15, a gap length delta 0 between the carcass cords 50A and the bead core 100 disposed on the step portion 170 occurs.
  • the carcass 50 is pulled in the direction of the arrow A shown in FIG. 13, that is, the inner side in the tire width direction and the outer side in the tire radial direction, so that tension is applied to each carcass cord 50a.
  • the carcass cord 50A disposed in the stepped portion 170 is displaced in the direction B of the arrow shown in FIG. Arise.
  • the so-called “end disturbance” in which the intervals of the carcass cords are uneven is likely to occur.
  • the present invention has been made in view of the above, and used a bead core for a pneumatic tire that can prevent end disturbance of a carcass cord due to a step portion generated by a winding start end portion of a bead wire and the bead core.
  • An object is to provide a pneumatic tire.
  • a bead core for a pneumatic tire according to the present invention is a bead core composed of a bead wire bundle formed by annularly winding a single bead wire a plurality of times, A step reduction member is provided at the step portion generated by the winding start end portion of the bead wire.
  • the gap formed between the carcass cord and the bead core disposed in the stepped portion by providing the step reducing member at the stepped portion generated by the winding start end portion of the bead wire ( ⁇ 0 ) can be reduced.
  • end disturbance of the carcass cord due to the stepped portion can be prevented, and cracking of the inner liner can be prevented.
  • the bead core for a pneumatic tire according to the present invention is characterized in that a maximum height of the step reducing member is smaller than a diameter of the bead wire.
  • the bead core for a pneumatic tire according to the present invention includes a fastening cord that binds the bead wire bundle by being wound around the bead wire bundle at a predetermined pitch, and the step reducing member includes the fastening cord other than the step portion. It is formed by winding at a winding pitch smaller than that of the region.
  • the bead core for a pneumatic tire according to the present invention is such that the step reducing member is formed by winding a cord member around the step portion, and the cord member is either an inorganic fiber cord or an organic fiber cord.
  • the cord member is either an inorganic fiber cord or an organic fiber cord.
  • One or more types are selected and used.
  • the material having the optimum material and size can be selected as the step reducing member, the above-described effect can be realized more reliably.
  • the step reduction member is formed by winding a tape member around the step portion, and the tape member is provided with rubber reinforced with nylon or vinylon. It is characterized by being either a plain weave tape or a weave tape.
  • the material having the optimum material and size can be selected as the step reducing member, the above-described effect can be realized more reliably.
  • the step reducing member is formed by disposing a spacer member on the step portion, and the spacer member includes a vulcanized rubber and a softening temperature. It is characterized in that it is composed of any one of a thermoplastic resin having a sulfur temperature or higher, a thermosetting resin, and a metal.
  • the material having the optimum material and size can be selected as the step reducing member, the above-described effect can be realized more reliably.
  • a pneumatic tire according to the present invention includes a pair of bead portions in which the bead core for a pneumatic tire having the step reducing member according to any one of claims 1 to 6 is disposed, and the pair of A carcass that is bridged between bead portions and whose both end portions are folded around the bead cores for pneumatic tires.
  • the step reducing member is provided at the step portion generated by the winding start end portion of the bead wire, the step amount can be reduced. As a result, end disturbance of the carcass cord due to the stepped portion can be prevented, and cracking of the inner liner can be prevented.
  • the distance between the end surface of the winding start end of the bead wire and the step reducing member is within 1 ⁇ 2 of the diameter of the carcass cord constituting the carcass.
  • the step reducing member is provided at the step portion generated by the winding start end portion of the bead wire.
  • a gap generated between the carcass cord and the bead core can be reduced.
  • end disturbance of the carcass cord due to the stepped portion can be prevented, and cracking of the inner liner can be prevented.
  • FIG. 1 is a cross-sectional view in the tire meridian direction of a pneumatic tire according to Embodiment 1.
  • FIG. FIG. 2 is a schematic perspective view showing a part of the bead core shown in FIG.
  • FIG. 3 is a cross-sectional view of the bead wire bundle shown in FIG. 2 cut along a plane orthogonal to the circumferential direction of the bead core.
  • FIG. 4 is a schematic view of the vicinity of the step reducing member of the bead core according to the first embodiment.
  • FIG. 5 is a schematic view of the vicinity of the step reducing member of the bead core according to the second embodiment.
  • FIG. 6 is a schematic view of the vicinity of the step reducing member of the bead core according to the second embodiment.
  • FIG. 7 is a schematic view of the vicinity of the step reducing member of the bead core according to the third embodiment.
  • FIG. 8 is a schematic view of the vicinity of the step reducing member of the bead core according to the third embodiment.
  • FIG. 9 is a schematic view of the vicinity of the step reducing member of the bead core according to the third embodiment.
  • FIG. 10 is a schematic view of the vicinity of the step reducing member of the bead core according to the third embodiment.
  • FIG. 11 is a table showing measurement results of Examples and Comparative Examples.
  • FIG. 12 is a diagram for explaining the concept of the carcass code offset amount.
  • FIG. 13 is a meridional sectional view of a bead portion in a conventional pneumatic tire.
  • FIG. 14 is a schematic perspective view showing a part of a conventional bead core.
  • FIG. 15 is a schematic diagram of the vicinity of the step portion of the bead core shown in FIG.
  • Embodiments of a pneumatic tire bead core and a pneumatic tire using the bead core according to the present invention will be described below in detail with reference to the drawings.
  • the present invention is not limited to the following embodiments.
  • constituent elements of the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.
  • the tire width direction means a direction parallel to the rotation axis (not shown) of the pneumatic tire
  • the inner side in the tire width direction means the side toward the tire equatorial plane in the tire width direction, and the outer side in the tire width direction.
  • the tire equator plane is a plane orthogonal to the rotational axis of the pneumatic tire and passing through the center of the tire width of the pneumatic tire.
  • the tire equator line is a pneumatic tire on the tire equator plane. A line along the circumferential direction.
  • the tire radial direction refers to a direction orthogonal to the rotation axis, the tire radial inner side is the side toward the rotation axis in the tire radial direction, and the tire radial direction outer side is the side away from the rotation axis in the tire radial direction.
  • the tire circumferential direction is a circumferential direction with the rotation axis as a central axis.
  • FIG. 1 is a sectional view in the tire meridian direction showing a pneumatic tire according to Embodiment 1.
  • FIG. A pneumatic tire 1 illustrated in FIG. 1 is configured to be substantially symmetric with respect to the tire equatorial plane, and includes a tread portion 2, a sidewall portion 3, a bead portion 4, a carcass 5, and a belt layer 6. And.
  • the tread portion 2 is a portion exposed to the outside in the tire radial direction, and the surface thereof is the contour of the pneumatic tire 1.
  • the surface of the tread portion 2 is formed as a tread surface 7 that is a surface that comes into contact with the road surface when a vehicle (not shown) on which the pneumatic tire 1 is mounted travels.
  • the sidewall portion 3 is exposed on the outermost side in the tire width direction.
  • the bead portion 4 is a portion provided on the inner side in the tire radial direction of the sidewall portion 3, and a pair is provided so as to be symmetrical about the tire equator plane.
  • the bead portion 4 includes a pneumatic tire bead core 10 (hereinafter simply referred to as “bead core”) and a bead filler 11 according to the present embodiment.
  • the bead core 10 is composed of an annular bead wire bundle formed by continuously winding a single bead wire (steel wire) 12 a plurality of times.
  • the bead core 10 has a role of fixing the pneumatic tire 1 to the rim flange portion 9 of the wheel 8 and a role of supporting the cord tension of the carcass 5 generated by the internal pressure of the pneumatic tire 1.
  • the detailed configuration of the bead core 10 will be described later.
  • the bead filler 11 is a rubber material for reinforcing the bead core 10, and is a space formed by folding both end portions of the carcass 5 outward in the tire width direction at the position of the bead core 10, and the tire diameter of the bead core 10. It is arranged outside in the direction.
  • the carcass 5 constitutes a tire skeleton, and a plurality of carcass cords (not shown) made of organic fibers (nylon (registered trademark), polyester, etc.) or steel are arranged in parallel and covered with a rubber material. It is a thing.
  • the carcass 5 is looped around the pair of bead portions 4 and 4 described above, and both end portions thereof are folded around the bead core 10 from the tire inner side toward the outer side, and are wound up along the bead filler 11.
  • the side walls 3 are engaged.
  • a plurality of carcass cords are arranged side by side in the tire circumferential direction while being along the tire meridian direction perpendicular to the tire equator line.
  • the carcass 5 shown in FIG. 1 is composed of one layer, it may have a multilayer structure in order to improve rigidity.
  • An inner liner (not shown) is formed along the carcass 5 on the inner side of the carcass 5 or on the inner side of the carcass 5 in the pneumatic
  • the belt layer 6 is disposed on the outer side in the tire radial direction, which is the outer periphery of the carcass 5, and covers the carcass 5 in the tire circumferential direction in the tread portion 2, and has a multilayer structure in which two or more belt layers are laminated. Yes.
  • the belt layer 6 is formed by coating a plurality of cords made of organic fibers (nylon (registered trademark), polyester, rayon, aramid, etc.), steel, etc. with a rubber material, and the cords are predetermined in the tire circumferential direction. It is arranged at an angle of.
  • FIG. 2 is a schematic perspective view illustrating a part of the bead core 10
  • FIG. 3 is a schematic cross-sectional view of the bead wire bundle cut along a plane orthogonal to the circumferential direction of the bead core 10.
  • a bead wire fastening cord 14 (hereinafter referred to as “fastening cord 14”) is wound around a bead wire bundle 13 formed in a ring shape by winding a single bead wire 12 a plurality of times. It is constituted by.
  • the cross-sectional shape of the bead wire bundle 13 has a hexagonal shape as illustrated in FIG.
  • the number of bead wires constituting the bead wire bundle 13 (that is, the number of times the bead wires 12 are wound) is not limited to the number illustrated in FIGS. 2 and 3.
  • the cross-sectional shape of the bead wire bundle 13 is not limited to the regular hexagonal shape shown in FIG. 3, and may be other shapes such as a hexagonal shape or a rectangular shape as shown in FIG.
  • the bead wire 12 is wound so that the winding start end 15 and the winding end end 16 overlap as shown in FIG. 2, and the winding start end 15 and the winding end end 16 overlap. And the fastening cord 14 mentioned above is wound around the site
  • the fastening cord 14 is a string for bundling the bead wire bundle 13 in order to suppress expansion (separation) of the wound bead wire 12 in the circumferential direction of the bead core, and is an organic material such as vinylon (registered trademark) or nylon (registered trademark). A cord made of fiber or the like is preferably used.
  • the diameter of the fastening cord 14 is smaller than the diameter of the bead wire 12.
  • the winding start end 15 of the bead wire 12 is located on the inner peripheral side of the bead core 10. Therefore, the winding start end portion 15 causes a step that protrudes inward in the tire radial direction on the inner peripheral surface of the bead core 10.
  • the extension region from the end surface 18 at the winding start end portion 15 of the bead wire 12 and the vicinity of the end surface 18 are referred to as “stepped portion 17”.
  • the step portion 17 is provided with a step reducing member 20 for reducing the step amount of the step generated by the winding start end portion 15 of the bead wire 12.
  • the fastening cord 14 described above is used as the step reducing member 20.
  • the winding pitch of the fastening cord 14 in the step portion 17 is wound at a high density at a pitch smaller than the winding pitch of the region other than the step portion 17, thereby reducing the step.
  • Member 20 is formed.
  • FIG. 4 is a diagram schematically showing the vicinity of the step reducing member 20 shown in FIG.
  • reference numeral 5 a indicated by a broken line is a carcass cord constituting the carcass 5 (see FIG. 1) arranged along the bead core 10.
  • the plurality of carcass cords 5 a are arranged at regular intervals along the circumferential direction of the bead core 10.
  • the carcass cord disposed at the position closest to the end face 18 of the winding start end portion 15 is referred to as “carcass cord 5A”.
  • the diameter of the carcass cords 5a and 5A will be described as d.
  • the step reducing member 20 has a distance L 0 from the end surface 18 at the winding start end portion 15 of the bead wire 12 to the fastening cord 14 closest to the end surface 18 within d / 2, and while satisfying the conditions winding pitch L 1 of the fastening cord 14 is within d / 2, and is formed by winding the fastening cord 14 in two laps or more spiral on the peripheral surface of the bead wire bundle 13.
  • FIG. 4 shows an example in which the fastening cord 14 is wound five times.
  • the height dimension of the step reducing member 20 (the amount projecting inward in the tire radial direction) is formed smaller than the diameter of the bead wire 12.
  • the carcass 5 is pulled in the direction of the arrow A shown in FIG. 13, so that tension is applied to each carcass cord 5a.
  • the carcass cord 50 ⁇ / b> A adjacent to the end surface 180 of the winding start end 150 moves in the direction of arrow B in FIG. 15.
  • the carcass cord 50A is loosened at the inner side in the tire width direction.
  • there is a problem that end disturbance of the carcass cord is likely to occur near the side tread portion (not shown) due to the loosening.
  • the step reducing member 20 is provided so as to satisfy the above-described conditions in the stepped portion 17, the step amount of the step formed on the inner peripheral surface of the bead core 10 is as follows. This is smaller than the case where the step reducing member 20 is not provided.
  • the length delta 1 of the gap between the carcass cords 5A and the bead core 10 as shown in FIG. 4 (closure code 14), (a or 0) delta 0 becomes smaller than that shown in FIG. 15.
  • the carcass cord 5A is not loosened as much as the conventional part in the tire width direction. Therefore, it is possible to effectively prevent the end disturbance of the carcass cord due to the stepped portion 17.
  • the number of windings of the retaining cord 14 in the step reducing member 20 is two times or more, and the winding width L 2 (see FIG. 4) of the step reducing member 20 is about twice or more the diameter d of the carcass cord 5A.
  • the width L 2 wound stepped reducing members 20 is preferably within about 4 times the diameter d of the carcass cord 5A.
  • the step reducing member 20 since it is provided in order to reduce the gap delta 0 between the carcass cords 50A and the bead core 100 shown in FIG. 15, the height (tire radial direction of the step reducing member 20 The amount of protrusion inward) needs to be smaller than the diameter of the bead wire 12.
  • the step reduction member 20 is provided by winding the fastening cord 14 around the step portion 17 generated by the winding start end portion 15 of the bead wire 12. It has a configuration.
  • the distance from the end face 18 to the fastening cord 14 closest to the end face 18 is within 1 ⁇ 2 of the diameter d of the carcass cord 5A, and the winding pitch of the fastening cord 14 is within d / 2. It is formed by winding the fastening cord two or more times while satisfying certain conditions.
  • the step amount of the step formed on the inner peripheral surface of the bead core 10 can be reduced. As a result, it is possible to prevent the end disturbance of the carcass cord due to the stepped portion 17 and to prevent the inner liner from cracking.
  • step difference reduction member 20 since the level
  • the step reducing member 20 is formed using the fastening cord 14 that binds the bead wire 12, a cord for providing the step reducing member 20 is separately prepared. Compared with the case where it does, said effect can be implement
  • the step reduction member 20 is provided by using the fastening cord 14 for binding the bead wire bundle 13 and winding the fastening cord 14 around the step portion 17 at a high density, but in the second embodiment, The point which provided the level
  • FIG. The rest is the same as the configuration of the first embodiment.
  • FIG. 5 shows an example in which the cord member 30 is used as a winding member.
  • the cord member 30 an inorganic fiber cord (steel cord formed by twisting a plurality of steel wires or steel wires) or an organic fiber cord (nylon, rayon, vinylon, polyester cord, carbon obtained by twisting carbon fibers) A fiber cord or the like).
  • an inorganic fiber cord steel cord formed by twisting a plurality of steel wires or steel wires
  • an organic fiber cord nylon, rayon, vinylon, polyester cord, carbon obtained by twisting carbon fibers
  • the fastening cord may be a steel wire that firmly tightens the bead wires 12 at the winding start end 15 and the winding end end 16 or an additional wire.
  • Nylon, vinylon, polyester, or the like which has a large thermal shrinkage at the temperature during sulfurization and is fastened with that force, is preferably used as the step reducing member 20 such as nylon, vinylon, or polyester that is versatile, inexpensive, and easy to work with.
  • the cord member 30 has a diameter smaller than that of the bead wire 12.
  • the step reducing member 20 formed of the cord member 30 has a distance L 0 from the end surface 18 at the winding start end portion 15 of the bead wire 12 to the cord member 30 closest to the end surface 18.
  • the cord member 30 is placed on the peripheral surface of the bead wire bundle 13 while satisfying the condition that the cord diameter is within d / 2 and the winding pitch L 1 of the cord member 30 (see FIG. 4) is within d / 2. It is formed by winding spirally over the circumference.
  • FIG. 5 shows an example in which the cord member 30 is wound seven times.
  • the height dimension of the step reducing member 20 (the amount projecting inward in the tire radial direction) is formed smaller than the diameter of the bead wire 12.
  • FIG. 6 shows an example in which a tape member 40 formed wider than the cord member 30 is used as the winding member.
  • a rubberized material such as nylon, more specifically, a plain woven tape with rubber reinforced with nylon or vinylon cord, a weave tape, or the like can be appropriately selected and used.
  • the tape member 40 has a thickness smaller than the diameter of the bead wire 12.
  • the step reducing member 20 comprising the tape member 40 satisfies the condition that the distance L 0 from the end surface 18 at the winding start end portion 15 of the bead wire 12 to the tape member 40 is within the diameter d / 2 of the carcass cord. 40 is wound around the circumferential surface of the bead wire bundle 13.
  • cord member 30 1 round is shown in FIG. 6, it is good also as a structure wound by 2 rounds or more.
  • the tape member 40 wider than the cord member 30 for the step reducing member 20 the number of windings around the bead wire bundle 13 can be reduced.
  • the winding width L 2 (see FIG. 4) of the cord member 30 shown in FIG. 5 and the tape member 40 shown in FIG. 6 is about four times the diameter d of the carcass cord 5A. It is preferable to be within.
  • the bead wire bundle 13 is bundled with the fastening cord 14 after the winding member (the cord member 30 and the tape member 40) is wound around the bead wire bundle 13 in advance. 14 may be configured to wind the winding member after binding the bead wire bundle.
  • the distance ⁇ 1 (see FIG. 4) from the carcass cord 5A to each winding member (the cord member 30 and the tape member 40) as small as possible. Therefore, when the diameter of the cord member 30 or the thickness of the tape member 40 is extremely small compared to the diameter of the bead wire 12, the cord member 30 or the tape member 40 is wound several times in the tire radial direction, The distance can be reduced.
  • the step reducing member 20 is provided in order to reduce the gap delta 0 between the carcass cords 50A and the bead core 100 shown in FIG. 15. Therefore, as in the first embodiment, the height dimension of the winding member (the cord member 30 and the tape member 40) (the amount projecting inward in the tire radial direction) needs to be smaller than the diameter of the bead wire 12. .
  • the step reducing member 20 is provided in the step portion 17 so as to satisfy the above-described condition, as in the first embodiment. Therefore, the level difference of the level difference formed on the inner peripheral surface of the bead core 10 is smaller than that when the level difference reducing member 20 is not provided. For this reason, the gap between the carcass cord 5A and the bead core 10 (the cord member 30 or the tape member 40) is smaller (or becomes 0) than ⁇ 0 shown in FIG. As a result, even if a tension is applied to the carcass cord 5A during vulcanization, the carcass cord 5A is not loosened as much as the conventional part in the tire width direction. Therefore, the end disturbance of the carcass cord caused by the stepped portion 17 can be effectively prevented, and the occurrence of cracks in the inner liner can be prevented.
  • the diameter of the cord member 30 or the thickness of the tape member 40 is obtained by winding the winding member (the cord member 30 or the tape member 40) a plurality of times in the tire radial direction. Even when the diameter of the bead wire 12 is extremely small compared to the diameter of the bead wire 12, the step amount of the step portion 17 can be reliably reduced. As a result, end disturbance of the carcass cord due to the stepped portion 17 can be reliably prevented.
  • a step is formed by using a winding member (the cord member 30 or the tape member 40) prepared separately from the fastening cord 14 for binding the bead wire 12.
  • a reduction member 20 is provided.
  • FIG. 3 a pneumatic tire bead core according to Embodiment 3 and a pneumatic tire using the bead core will be described.
  • symbol is attached
  • 7 to 10 are views schematically showing the vicinity of the step reducing member 20 of the bead core 10 according to the third embodiment.
  • (a) is the figure which looked at the bead core 10 from the same direction as FIG. 4
  • (b) is the figure which looked at (a) from the arrow C direction.
  • the third embodiment is different from the configuration of the second embodiment in that instead of the winding member 30 used in the second embodiment, spacer members 50 to 80 described later are used as the step reducing member 20. Yes. Other than that, the configuration is the same as that of the second embodiment.
  • FIG. 7 shows an example in which a conical spacer 50 formed in a conical shape is used as the spacer member.
  • the conical spacer 50 is made of a material selected from vulcanized rubber, thermoplastic resin having a softening temperature equal to or higher than the vulcanization temperature, thermosetting resin, metal, and the like.
  • vulcanized rubber one having a hardness at 23 ° C. (JIS Hs) of 50 or more is used.
  • JIS Hs hardness at 23 ° C.
  • a steel cord etc. are used as a metal.
  • the conical spacer 50 is disposed in the stepped portion 17 so that the end surface 51 faces the end surface 18 of the bead wire 12 and is joined to the stepped portion 17 (bead wire 12) with an adhesive or the like.
  • the diameter of the end surface 51 of the conical spacer 50 (that is, the maximum height of the conical spacer 50) is equal to or smaller than the diameter of the bead wire 12.
  • the distance L 0 from the end surface 18 at the winding start end portion 15 of the bead wire 12 to the end surface 51 of the conical spacer 50 is preferably within d / 2.
  • the total length (length along the circumferential direction of the bead core 10) L 3 of the conical spacer 50 is preferably within about 4 times the diameter d of the carcass cord 5A.
  • FIG. 8 shows an example in which a wedge-shaped spacer 60 formed in a wedge shape in which one end portion is thick and the thickness gradually decreases toward the other end portion is used as the spacer member.
  • the wedge-shaped spacer 60 is made of the same material as the conical spacer 50 described above, and the thickness dimension of the end surface 61 at one end (that is, the maximum height of the wedge-shaped spacer 60) is as shown in FIG.
  • the bead wire 12 is formed to have a diameter equal to or smaller than that.
  • the wedge-shaped spacer 60 is disposed in the stepped portion 17 such that the end surface 61 faces the end surface 18 of the bead wire 12 and is joined to the stepped portion 17 (bead wire 12) by an adhesive or the like.
  • the distance L 0 from the end surface 18 at the winding start end 15 of the bead wire 12 to the end surface 61 of the wedge-shaped spacer 60 is preferably within d / 2.
  • the total length L 3 of the wedge-shaped spacer 60 (the length along the circumferential direction of the bead core 10) is preferably within about four times the diameter d of the carcass cord 5A.
  • the width of the wedge-shaped spacer 60 is preferably about the same as or smaller than the diameter of the bead wire 12.
  • FIG. 9 shows an example in which a cylindrical spacer 70 formed in a cylindrical shape is used as the spacer member.
  • the cylindrical spacer 70 is made of the same material as the conical spacer 50 described above, and the diameter of the end surface 71 (that is, the amount of protrusion inward in the tire radial direction) is as shown in FIG. It is formed smaller than the diameter.
  • the cylindrical spacer 70 is disposed in the stepped portion 17 such that one end surface 71 faces the end surface 18 of the bead wire 12 and is joined to the stepped portion 17 (bead wire 12) by an adhesive or the like.
  • the distance L 0 from the end surface 18 at the winding start end portion 15 of the bead wire 12 to one end surface 71 of the cylindrical spacer 70 is preferably within d / 2.
  • the total length L 3 of the cylindrical spacer 70 (the length along the circumferential direction of the bead core 10) is preferably within about four times the diameter d of the carcass cord 5A.
  • FIG. 10 shows an example in which a rectangular parallelepiped spacer 80 formed in a rectangular parallelepiped shape is used as the spacer member.
  • the rectangular parallelepiped spacer 80 is made of the same material as the conical spacer 50 described above, and its height (that is, the amount of protrusion inward in the tire radial direction) is the diameter of the bead wire 12 as shown in FIG. It is formed smaller than.
  • This rectangular parallelepiped spacer 80 is disposed in the stepped portion 17 such that the end surface 81 faces the end surface 18 of the bead wire 12 and is joined to the stepped portion 17 (bead wire 12) by an adhesive or the like.
  • the distance L 0 from the end surface 18 at the winding start end 15 of the bead wire 12 to the end surface 81 of the rectangular parallelepiped spacer 80 is preferably within d / 2.
  • the total length L 3 of the rectangular parallelepiped spacer 80 (the length along the circumferential direction of the bead core 10) is preferably within about four times the diameter d of the carcass cord 5A.
  • the width dimension of the rectangular parallelepiped spacer 80 is preferably equal to or less than the diameter of the bead wire 12.
  • the step portion 17 is provided so as to satisfy the above-described condition, so that the inner peripheral side of the bead core 10 is provided.
  • the level difference of the level difference formed on the surface is smaller than that when the level difference reducing member 20 is not provided.
  • the gap between the carcass cord 5A and the bead core 10 (spacer member) becomes smaller (or becomes 0) than ⁇ 0 shown in FIG.
  • the carcass cord 5A is not loosened as much as the conventional part in the tire width direction. Therefore, the end disturbance of the carcass cord caused by the stepped portion 17 can be effectively prevented, and the occurrence of cracks in the inner liner can be prevented.
  • the step reducing member 20 is provided using a member prepared separately from the fastening cord 14 for binding the bead wires 12. For this reason, compared with the said Embodiment 1 which provided the level
  • the spacer members 50 to 80 described above need only be adhered to the stepped portion 70 with an adhesive or the like, the fastening cord 14 of the first embodiment or the winding member (cord of the second embodiment) Compared with the case of using the member 30 and the tape member 40), the installation work of the step reducing member 20 is easy.
  • Examples 1 to 6 Comparative Examples 1 and 2
  • a step-reducing member was formed in the step portion by winding a retaining cord having a diameter of 0.2 mm around the step portion as shown in FIG.
  • Vinylon (1200d / 200f / 1) was used as the material of the fastening cord.
  • Examples 1 to 6 and Comparative Examples in which the distance L 0 from the end face at the winding start end of the bead wire to the fastening cord (step reduction member) and the winding width L 2 of the fastening cord are different.
  • 1 and 8 pneumatic tires were prepared. Incidentally, the winding pitch L 1 of the fastening cord, were all 0.2mm in the above Examples and Comparative Examples.
  • Example 6 it was set as the structure (double winding) which piled up the fastening cord of the level
  • Examples 7 and 8, Comparative Example 3 Cylindrical spacers were used as the step reduction members, arranged on the step portions as shown in FIG. 9, and joined to the step portions with an adhesive. Vulcanized rubber was used as the material of the cylindrical spacer. As shown in FIG. 11, Examples 7 and 8 and Comparative Example 4 in which the distance L 0 from the end surface at the winding start end of the bead wire to the cylindrical spacer (step reduction member) and the diameter of the cylindrical spacer are different. Three pneumatic tires were prepared. Note that the total length L 3 of the cylindrical spacer (the length along the circumferential direction of the bead core) was set to 10 mm in all the examples and comparative examples.
  • the carcass cord offset amount corresponding to the front and rear end portions of the buttress portion before and after vulcanization of the green tire was measured.
  • the carcass code offset amount is an amount representing the position after movement of the carcass cord by a difference (distance) from the original position before movement, and (ab) / 2.
  • the carcass cord offset amount is 1 mm or more, the possibility of the carcass cord opening is increased.
  • FIG. 11 shows the measurement results.
  • the distance L 0 from the end face of the winding start end of the bead wire to the fastening cord is 0.3 mm (that is, less than 1 ⁇ 2 of the diameter d of the carcass cord).
  • the carcass cord offset amount was 0, and good results were obtained.
  • the carcass cord offset amount was extremely small, and good results were obtained.
  • Example 7 in which the distance L 0 from the end surface at the winding start end of the bead wire to the cylindrical spacer is 0.3 mm (that is, less than 1 ⁇ 2 of the diameter d of the carcass cord), the carcass cord offset amount is zero. And good results were obtained.
  • Example 8 in which the distance L 0 from the end face at the winding start end of the bead wire to the cylindrical spacer is less than the diameter d of the carcass cord, the carcass cord offset amount is small, and good results were obtained.
  • the bead core for a pneumatic tire according to the present invention and the pneumatic tire using the bead core prevent end-disturbance of the carcass cord due to the step generated by the winding start end portion of the bead wire constituting the bead core. It is useful for a pneumatic tire having a bead core having a single wind structure.

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

Abstract

L'invention porte sur une tringle de talon (10) pour un pneu, laquelle tringle est constituée par un faisceau de fils de talon annulaire (13) qui est formé par enroulement d'un fil de talon unique (12) en une pluralité de spires. Un élément de réduction d'épaulement (20) est disposé au niveau d'une partie d'épaulement (17) provoquée par une extrémité de début d'enroulement (15) du fil de talon (12). L'invention porte également sur un pneu (1), qui comporte une paire de parties de talon (4) dans lesquelles les tringles de talon (10) pour un pneu comportant les éléments de réduction d'épaulement (20) sont disposées, et une carcasse (5) qui s'étend entre la paire de parties de talon (4, 4) et qui est repliée autour des tringles de talon respectives (10) aux deux extrémités.
PCT/JP2010/065345 2009-09-10 2010-09-07 Tringle de talon pour pneu et pneu utilisant la tringle de talon WO2011030765A1 (fr)

Priority Applications (1)

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CN201080040155.8A CN102481813B (zh) 2009-09-10 2010-09-07 充气轮胎用胎圈芯及使用该胎圈芯的充气轮胎

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JP2009209774A JP5351675B2 (ja) 2009-09-10 2009-09-10 空気入りタイヤ用ビードコア及びそのビードコアを用いた空気入りタイヤ
JP2009-209774 2009-09-10

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Cited By (2)

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EP2767416A4 (fr) * 2011-12-15 2015-06-17 Sumitomo Rubber Ind Bandage pneumatique et son procédé de fabrication
WO2019239941A1 (fr) * 2018-06-15 2019-12-19 株式会社ブリヂストン Pneumatique

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WO2011030764A1 (fr) * 2009-09-10 2011-03-17 不二精工株式会社 Procédé de production et dispositif de production de talon
CN103608195A (zh) * 2011-06-20 2014-02-26 株式会社普利司通 充气轮胎
KR101507237B1 (ko) * 2013-08-19 2015-03-30 한국타이어 주식회사 비드부가 개선된 중하중 차량용 타이어

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JPS6012320A (ja) * 1983-06-30 1985-01-22 Yokohama Rubber Co Ltd:The 空気入りタイヤ
JPH06328915A (ja) * 1993-05-21 1994-11-29 Toyo Tire & Rubber Co Ltd 空気入りタイヤのビードコア
JP2000247118A (ja) * 1999-02-25 2000-09-12 Sumitomo Rubber Ind Ltd 空気入りタイヤ
JP2003118323A (ja) * 2001-10-16 2003-04-23 Sumitomo Rubber Ind Ltd 空気入りタイヤ
JP2004345537A (ja) * 2003-05-23 2004-12-09 Fuji Seiko Kk ビードコア及びそれを用いた空気入りラジアルタイヤ
JP2005254885A (ja) * 2004-03-09 2005-09-22 Sumitomo Rubber Ind Ltd 空気入りタイヤ

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JPS6012320A (ja) * 1983-06-30 1985-01-22 Yokohama Rubber Co Ltd:The 空気入りタイヤ
JPH06328915A (ja) * 1993-05-21 1994-11-29 Toyo Tire & Rubber Co Ltd 空気入りタイヤのビードコア
JP2000247118A (ja) * 1999-02-25 2000-09-12 Sumitomo Rubber Ind Ltd 空気入りタイヤ
JP2003118323A (ja) * 2001-10-16 2003-04-23 Sumitomo Rubber Ind Ltd 空気入りタイヤ
JP2004345537A (ja) * 2003-05-23 2004-12-09 Fuji Seiko Kk ビードコア及びそれを用いた空気入りラジアルタイヤ
JP2005254885A (ja) * 2004-03-09 2005-09-22 Sumitomo Rubber Ind Ltd 空気入りタイヤ

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Publication number Priority date Publication date Assignee Title
EP2767416A4 (fr) * 2011-12-15 2015-06-17 Sumitomo Rubber Ind Bandage pneumatique et son procédé de fabrication
US10894376B2 (en) 2011-12-15 2021-01-19 Sumitomo Rubber Industries, Ltd. Pneumatic tire and manufacturing method therefor
WO2019239941A1 (fr) * 2018-06-15 2019-12-19 株式会社ブリヂストン Pneumatique
JP2019217822A (ja) * 2018-06-15 2019-12-26 株式会社ブリヂストン 空気入りタイヤ

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JP2011057105A (ja) 2011-03-24
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CN102481813B (zh) 2014-05-28

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