WO2020004040A1 - Pneumatique - Google Patents

Pneumatique Download PDF

Info

Publication number
WO2020004040A1
WO2020004040A1 PCT/JP2019/023318 JP2019023318W WO2020004040A1 WO 2020004040 A1 WO2020004040 A1 WO 2020004040A1 JP 2019023318 W JP2019023318 W JP 2019023318W WO 2020004040 A1 WO2020004040 A1 WO 2020004040A1
Authority
WO
WIPO (PCT)
Prior art keywords
resin
groove
tire
belt
tread
Prior art date
Application number
PCT/JP2019/023318
Other languages
English (en)
Japanese (ja)
Inventor
正之 有馬
Original Assignee
株式会社ブリヂストン
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 株式会社ブリヂストン filed Critical 株式会社ブリヂストン
Priority to JP2020527382A priority Critical patent/JPWO2020004040A1/ja
Publication of WO2020004040A1 publication Critical patent/WO2020004040A1/fr

Links

Images

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
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
    • 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 provided with a belt including a cord wound in a spiral shape.
  • two or more inclined belt plies configured to include a cord inclined with respect to the tire circumferential direction on the tire radial outside of the carcass, and the tire radial outside of the inclined belt ply.
  • a structure including a belt composed of a plurality of layers including a reinforcing layer and the like arranged is generally used (see, for example, JP-A-2013-244930 and JP-A-2013-220743).
  • the above pneumatic tire is provided with two or more inclined belt plies and a reinforcing layer, it is possible to secure in-plane shear rigidity and the like necessary for reinforcing the crown portion of the carcass. Since the number of reinforcing layers is large, it is difficult to reduce the weight of the tire. In recent years, needs such as weight reduction of pneumatic tires have been increasing, and pneumatic tires corresponding thereto have been demanded.
  • the present disclosure has a belt in which a resin-coated cord is spirally wound, thereby suppressing deformation during traveling, thereby ensuring both in-plane shear rigidity and weight reduction.
  • a resin-coated cord is spirally wound, thereby suppressing deformation during traveling, thereby ensuring both in-plane shear rigidity and weight reduction.
  • stress concentration on the groove bottom can be avoided, the occurrence of groove bottom cracks can be suppressed, and the groove volume of the tread can be increased. It is an object of the present invention to provide a pneumatic tire capable of improving the pneumatic tire.
  • a pneumatic tire according to the present disclosure is configured to include a carcass straddling from one bead portion to the other bead portion, and a tire case in which at least an outer portion in the tire width direction of the carcass is covered with a first rubber material.
  • a groove is provided on the surface, and a tread made of a second rubber material is disposed outside the tire case in the tire radial direction, and is disposed between the tire case and the tread, and a cord is attached to the first rubber material.
  • a resin-coated cord formed by coating with a resin having a tensile modulus higher than that of the second rubber material is spirally wound, and is adjacent to each other in the tire width direction when viewed in a cross section in the tire width direction.
  • a single-layer belt in which the resin of one resin-coated cord and the resin of the other resin-coated cord are integrally joined, and the groove of the tread is A groove bottom surface located at the deepest portion of the groove, and a groove wall surface arranged radially outward from both ends in the width direction of the groove bottom surface, and in a cross section of the groove orthogonal to the length direction of the groove, A corner between the groove bottom surface and the groove wall surface is formed by an arc curved so as to protrude inward in the tire radial direction, and the radius of curvature of the arc is 1.2 (R4) mm or less and 0.6 (R2). ) Mm or more.
  • the pneumatic tire of the belt this, together with the cord coated with a resin is wound helically, and a resin coated with a resin and the other code coated with one of the codes adjacent in the tire width direction integrally It is a configuration that is joined together.
  • the belt since the belt has a resin having a higher tensile modulus than the first rubber material for covering the outer portion of the carcass and the second rubber material for the tread, which are continuous in the tire width direction, the belt is provided between the cords. Higher in-plane shear rigidity can be obtained as compared to a belt on which rubber is arranged.
  • the corner between the groove bottom surface and the groove wall surface is formed by an arc curved so as to protrude inward in the tire radial direction, and the radius of curvature of the arc is 1.2 (R4) mm or less, and 0.6 Since it is (R2) mm or more, generation of cracks at the groove bottom can be suppressed.
  • the radius of curvature can be set to the above range, the groove volume can be increased as compared with the case where the radius exceeds the upper limit of the above range, so that drainage can be improved.
  • the reason why the radius of curvature of the arc is preferably 0.6 (R2) mm or more is that if it is less than 0.6 (mm), cracks are likely to occur on the groove bottom, and the radius of curvature of the arc is 1.2 (R2).
  • the reason for setting R4) mm or less is that if it exceeds this, the cross-sectional area of the groove becomes smaller and the groove volume decreases, and the ability to remove water, that is, the so-called drainage property becomes insufficient.
  • the in-plane shear rigidity of the belt can be ensured and the weight can be reduced, and further, by adjusting the radius of curvature of the corner of the groove, stress concentration on the groove bottom can be avoided. Generation of groove bottom cracks can be suppressed, and the groove volume can be increased, so that good drainage properties can be ensured.
  • FIG. 1 It is a sectional view along the tire rotation axis showing the pneumatic tire concerning the embodiment of the present invention. It is an expanded sectional view showing near a shoulder of a pneumatic tire concerning an embodiment of the present invention.
  • (A) and (B) are sectional views orthogonal to the length direction of the groove showing the radius of curvature of the arc of the groove of the tread according to the embodiment of the present invention. It is explanatory drawing which shows generation
  • the pneumatic tire 10 of the present embodiment is, for example, a so-called radial tire used for a passenger car, includes a pair of bead portions 20 in which a bead core 12 is embedded, and one bead portion 20 and the other bead portion.
  • a carcass 16 composed of one carcass ply 14 straddles the bead portion 20.
  • FIG. 1 shows the shape of the pneumatic tire 10 in a natural state before air filling.
  • 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 tire.
  • the cord material of the carcass ply 14 is, for example, PET, but may be another known material.
  • the end portion of the carcass ply 14 in the tire width direction has the bead core 12 folded back in the tire radial direction.
  • a portion extending from one bead core 12 to the other bead core 12 is referred to as a main body portion 14A, and a portion folded from the bead core 12 is referred to as a folded portion 14B.
  • Bead fillers 18 whose thickness gradually decreases from the bead core 12 to the outside in the tire radial direction are disposed between the main body portion 14A and the folded portion 14B of the carcass ply 14.
  • a portion of the bead filler 18 from the tire radial outer end 18 ⁇ / b> A to the tire radial direction inside is a bead portion 20.
  • An inner liner 22 made of rubber is arranged inside the tire of the carcass 16, and a side rubber layer 24 made of the first rubber material is arranged outside the carcass 16 in the tire width direction.
  • the tire case 25 is constituted by the bead core 12, the carcass 16, the bead filler 18, the inner liner 22, and the side rubber layer 24.
  • the tire case 25 is, in other words, a tire frame member that forms the frame of the pneumatic tire 10.
  • a belt 26 is arranged outside the crown portion of the carcass 16, in other words, outside the carcass 16 in the tire radial direction, and the belt 26 is in close contact with the outer peripheral surface of the carcass 16.
  • the belt 26 is formed by winding a plurality of (two in this embodiment) reinforcing cords 30 around a resin-coated cord 34 covered with a resin 32.
  • the belt 26 is formed by spirally winding a resin-coated cord 34 (shown by a two-dot chain line in FIG. 2) in which two reinforcing cords 30 are covered with a resin 32 for covering.
  • the cross-sectional shape of the resin-coated cord 34 is rectangular (rectangular width).
  • the belt 26 is formed on the outer peripheral surface of the belt forming drum by helically winding the resin-coated cord 34 around the outer peripheral surface of a belt forming drum (not shown) and pressing the resin-coated cord 34 against the outer peripheral surface.
  • the coating resin on the inner peripheral portion in the tire radial direction of the resin coating cord 34 is configured to be bonded to the outer peripheral surface of the carcass 16 via rubber or an adhesive.
  • the coating resins adjacent to each other in the tire width direction of the resin coating cord 34 are integrally joined by heat welding, an adhesive or the like.
  • a belt 26 (resin-coated belt) including the reinforcing cord 30 coated with the coating resin is formed.
  • the reinforcing cord 30 of the belt 26 can be composed of a monofilament (single wire) such as a metal fiber or an organic fiber, or a multifilament (stranded wire) obtained by twisting these fibers.
  • the reinforcing cord 30 of the present embodiment is a steel cord.
  • a steel cord of “1 ⁇ 5” having a diameter of 0.225 mm can be used, but a steel cord having another conventionally known structure can also be used.
  • thermoplastic resin having elasticity a thermoplastic elastomer (TPE), a thermosetting resin, or the like can be used. Considering the elasticity during running and the moldability during manufacturing, it is desirable to use a thermoplastic elastomer.
  • thermoplastic elastomer examples include polyolefin-based thermoplastic elastomer (TPO), polystyrene-based thermoplastic elastomer (TPS), polyamide-based thermoplastic elastomer (TPA), polyurethane-based thermoplastic elastomer (TPU), and polyester-based thermoplastic elastomer (TPC). And dynamically crosslinked thermoplastic elastomers (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
  • TEV dynamically crosslinked thermoplastic elastomers
  • thermoplastic resin examples include a polyurethane resin, a polyolefin resin, a vinyl chloride resin, and a polyamide resin.
  • the thermoplastic resin material for example, the deflection temperature under load (under a load of 0.45 MPa) specified in ISO75-2 or ASTM D648 is 78 degrees or more, and the tensile yield strength specified in JIS K7113 is 10 MPa or more.
  • the tensile elongation at break specified in JIS K 7113 of 50% or more and a Vicat softening temperature (Method A) specified in JIS K 7206 of 130 ° C. or more can be used.
  • the tensile modulus of elasticity of the resin 32 that covers the reinforcing cord 30 (defined by JIS K7113: 1995) is preferably 100 MPa or more.
  • the upper limit of the tensile modulus of the resin 32 covering the reinforcing cord 30 is preferably 1000 MPa or less.
  • the tensile modulus of the resin 32 covering the reinforcing cord 30 is particularly preferably in the range of 200 to 700 MPa.
  • the thickness t of the belt 26 of the present embodiment is preferably larger than the diameter of the reinforcing cord 30.
  • the reinforcing cord 30 is completely embedded in the resin 32. Is preferred.
  • the thickness t of the belt 26 is preferably set to 0.70 mm or more.
  • a tread 36 made of a second rubber material is disposed outside the belt 26 in the tire radial direction.
  • As the second rubber material used for the tread 36 a generally known material is used.
  • a groove 37 for drainage is formed in the tread 36.
  • the width BW of the belt 26 measured along the tire axial direction is 75% or more of 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 be 110% with respect to the contact width TW.
  • the contact width TW of the tread 36 means that the pneumatic tire 10 is mounted on a standard rim stipulated in JATMA YEAR BOOK (2018 edition, Japan Automobile Tire Association Standard) and the applicable size in JATMA YEAR BOOK. Fills with 100% internal pressure of the air pressure (maximum air pressure) corresponding to the maximum load capacity (the bold load in the internal pressure-load capacity correspondence table) in the ply rating, and the rotation axis is parallel to the horizontal flat plate in a stationary state And a mass corresponding to the maximum load capacity is added.
  • the TRA standard and the ETRTO standard are applied at the place of use or the place of manufacture, the respective standards are followed.
  • the in-plane shear rigidity of the belt 26 is preferably equal to or greater than that of the belt formed by rubber coating.
  • the groove 37 of the tread 36 in the cross section of the groove 37 orthogonal to the length direction of the groove 37, as shown in FIG. Grooved wall surface 42 is provided.
  • an arc curved so as to be convex inward in the tire radial direction is formed at the corner between the groove bottom surface 41 and the groove wall surface 42.
  • the radius of curvature R of this arc is preferably 1.2 (R4) mm or less in consideration of drainage characteristics that depend on the cross-sectional area of the groove 37 (volume of the groove 37). Further, it is preferable that the radius of curvature R of the arc be 0.6 (R2) mm or more in consideration of the occurrence of groove bottom cracks due to stress concentration during running on the groove bottom surface 41 of the groove 37.
  • the crown portion of the carcass 16 is reinforced by the spirally wound reinforcing cord 30 with the belt 26 covered with the resin 32.
  • the weight is reduced and the production is simplified.
  • the tensile elasticity of the resin 32 covering the reinforcing cord 30 is set to 100 MPa or more and the thickness is secured to 0.7 mm or more, in-plane shearing of the belt 26 in the tire width direction is performed.
  • the rigidity can be sufficiently secured.
  • the belt 26 having a high in-plane shear rigidity is used, and the width BW of the belt 26 is set to be 75% or more of the contact width TW of the tread 36. Can be increased.
  • the belt 26 since the belt 26 has a one-layer structure, the thickness of the belt 26 can be reduced as compared with a conventional case where two or more belt plies are used, and the tread 36 The thickness can be increased, and the depth of the groove 37 can be increased. As a result, the life of the pneumatic tire 10 can be extended.
  • the reinforcing cord 30 is 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 tire circumferential direction.
  • 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, the reinforcing cord 30 embedded in the resin 32 may be too thick to obtain a slack effect.
  • the width BW of the belt 26 is less than 75% of the contact width TW of the tread 36, the hoop effect of the belt 26 becomes insufficient, and it becomes difficult to suppress the generation of noise near the shoulder 39. Or there is a risk of On the other hand, if the width BW of the belt 26 exceeds 100% with respect to the contact width TW of the tread 36, the hoop effect will reach a plateau state, the belt 26 will be more than necessary, and the pneumatic tire 10 will increase in weight.
  • an arc curved so as to protrude inward in the tire radial direction is formed at the corner between the groove bottom surface 41 and the groove wall surface 42, and the radius of curvature of this arc is 1.2. (R4) mm or less and 0.6 (R2) mm or more. Since the radius of curvature of this arc is 0.6 (R2) mm or more, it is possible to suppress the occurrence of cracks in the groove bottom surface 41 as compared with a radius smaller than the numerical value.
  • the radius of curvature of the arc is 1.2 (R4) mm or less
  • the cross-sectional area of the groove 37 can be increased and the volume of the groove 37 can be increased as compared with a case where the radius of curvature is larger than 1.2 (R4) mm. It is possible to ensure sufficient drainage.
  • the radius of curvature of the circular arc at the corner of the groove 37 as described above, stress concentration on the groove bottom surface 41 can be avoided, and generation of the groove bottom crack can be prevented.
  • the volume of the groove 37 can be increased, and there is an excellent effect that a good drainage property can be secured.
  • the vicinity of the end in the tire width direction of the belt 26 may be covered with a belt-shaped layer from the outside in the tire radial direction.
  • the rigidity difference is large. Stress is likely to concentrate at a portion where the rigidity changes greatly, such as near the end of the belt 26. For this reason, by covering with a layer, the rigidity can be gradually changed from the end of the belt 26 to the tread 36 when viewed in the tire width direction, and the concentration of stress near the belt end can be suppressed.
  • a resin layer made of only a resin material may be provided between the belt 26 and the carcass 16.
  • the resin material forming the resin layer and the resin 32 of the belt 26 are joined by welding to be integrated.
  • the resin layer is integrated with the belt 26 and the resin portion is thickened, so that the in-plane shear rigidity of the belt 26 can be further increased.
  • the resin-coated cords 34 adjacent to each other are joined by welding only the side surfaces, the resin-coated cords 34 adjacent to each other can be formed not only by the side surfaces but also via the resin layer. Since they are joined by welding, high joining strength can be obtained.
  • the belt 26 of the above embodiment was formed with a constant diameter and a constant thickness in the tire axial direction, in other words, it was straight when viewed in a cross section along the tire axis, but is not limited thereto.
  • the outer diameter at the center in the tire width direction is larger than the outer diameter at both ends in the tire width direction, and when viewed in a cross section along the tire axis, the center in the tire width direction is convex outward in the tire radial direction. It may be arc-shaped.
  • the resin-coated cord 34 used for manufacturing the belt 26 is obtained by covering two reinforcing cords 30 with the resin 32.
  • the reinforcing cord 30 may be covered with the resin 32, or three or more reinforcing cords 30 may be covered with the resin 32.
  • the resin-coated cord 34 of the above embodiment has a rectangular cross-sectional shape, and as shown in FIG. 2, an inner peripheral surface 34A on the carcass 16 side (lower side in the drawing) and an outer peripheral surface on the tread 36 side (upper side in the drawing).
  • the surface 34B is not displaced in the belt width direction, but the cross section of the resin-coated cord 34 is not limited to a rectangle, and the inner peripheral surface 34A on the carcass side (the lower side in the drawing) and the tread side (the upper side in the drawing).
  • the outer peripheral surface 34B may be displaced in the belt width direction.
  • the belt 26 of the present embodiment is not limited to a general pneumatic tire, and may be used for a run flat tire whose side portions are reinforced with reinforcing rubber.
  • the side surfaces in the tire width direction of the resin-coated cords 34 adjacent in the belt width direction are joined by welding, but may be joined by using an adhesive.
  • tire models R1 to R5 were created as shown in FIG. 4 with the radius of curvature of the circular arc at the corner between the groove bottom surface and the groove wall surface of the main groove having a width of 7 mm.
  • the tire model (R2 to R4, Examples 1 to 3) according to the above-described embodiment of the present invention has a groove having the same groove bottom depth and a groove that differs only in the radius of curvature of the groove arc ( R1 and R5 and Comparative Examples 1 and 2) were verified by simulation.
  • FIG. 4 shows the results of crack resistance performance at the bottom of the tread groove by simulation of the tire model.

Landscapes

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

Abstract

L'invention concerne un pneumatique pourvu d'une ceinture monocouche dans laquelle un câblé revêtu de résine formé par revêtement d'un câblé avec de la résine est enroulé en hélice entre une enveloppe de pneu et une bande de roulement de telle sorte que la résine sur l'une des sections du câblé revêtu de résine, qui sont adjacentes l'une à l'autre dans la direction de la largeur du pneu, et la résine sur l'autre section revêtue de résine sont assemblées d'un seul tenant. Une rainure dans la bande de roulement est pourvue d'une surface de fond de rainure et de surfaces de paroi de rainure. Dans une section transversale de la rainure, comme vue perpendiculairement à la direction longitudinale de la rainure, les coins entre la surface de fond de rainure et les surfaces de paroi de rainure présentent une forme en arc circulaire incurvée de façon à faire saillie vers l'intérieur dans la direction radiale du pneu, et le rayon de courbure de l'arc circulaire est inférieur ou égal à 1,2 mm et supérieur ou égal à 0,6 mm.
PCT/JP2019/023318 2018-06-25 2019-06-12 Pneumatique WO2020004040A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2020527382A JPWO2020004040A1 (ja) 2018-06-25 2019-06-12 空気入りタイヤ

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018-120277 2018-06-25
JP2018120277 2018-06-25

Publications (1)

Publication Number Publication Date
WO2020004040A1 true WO2020004040A1 (fr) 2020-01-02

Family

ID=68987091

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2019/023318 WO2020004040A1 (fr) 2018-06-25 2019-06-12 Pneumatique

Country Status (2)

Country Link
JP (1) JPWO2020004040A1 (fr)
WO (1) WO2020004040A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012041008A (ja) * 2010-08-23 2012-03-01 Sumitomo Rubber Ind Ltd 空気入りタイヤ
JP2013180616A (ja) * 2012-02-29 2013-09-12 Bridgestone Corp タイヤ
JP2016078556A (ja) * 2014-10-14 2016-05-16 住友ゴム工業株式会社 空気入りタイヤ
WO2017183704A1 (fr) * 2016-04-22 2017-10-26 株式会社ブリヂストン Pneumatique
WO2017200062A1 (fr) * 2016-05-20 2017-11-23 株式会社ブリヂストン Pneumatique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012041008A (ja) * 2010-08-23 2012-03-01 Sumitomo Rubber Ind Ltd 空気入りタイヤ
JP2013180616A (ja) * 2012-02-29 2013-09-12 Bridgestone Corp タイヤ
JP2016078556A (ja) * 2014-10-14 2016-05-16 住友ゴム工業株式会社 空気入りタイヤ
WO2017183704A1 (fr) * 2016-04-22 2017-10-26 株式会社ブリヂストン Pneumatique
WO2017200062A1 (fr) * 2016-05-20 2017-11-23 株式会社ブリヂストン Pneumatique

Also Published As

Publication number Publication date
JPWO2020004040A1 (ja) 2021-07-08

Similar Documents

Publication Publication Date Title
JP6211320B2 (ja) タイヤ
JP6875209B2 (ja) ランフラットタイヤ
WO2017188409A1 (fr) Pneumatique radial à roulage à plat
JP6934452B2 (ja) タイヤ
WO2020004040A1 (fr) Pneumatique
WO2019239898A1 (fr) Bandage pneumatique
JP6989223B2 (ja) 空気入りタイヤ
JP6781671B2 (ja) ランフラットタイヤ
JP6831300B2 (ja) ランフラットタイヤ
JP7377699B2 (ja) 空気入りタイヤ
WO2019244851A1 (fr) Pneumatique
WO2019239895A1 (fr) Pneu
JP7004400B2 (ja) タイヤ
JP7377698B2 (ja) 空気入りタイヤ
JP7128271B2 (ja) 空気入りタイヤ
JP6930943B2 (ja) 空気入りタイヤ
WO2021125112A1 (fr) Bandage pneumatique
WO2019244737A1 (fr) Bandage pneumatique
WO2020004045A1 (fr) Pneu et procédé de fabrication de pneu
JP6850679B2 (ja) ランフラットラジアルタイヤ
WO2019230811A1 (fr) Pneu
WO2019244773A1 (fr) Pneu
JP6945346B2 (ja) ランフラットラジアルタイヤ
WO2019235323A1 (fr) Pneumatique
WO2019230812A1 (fr) Bandage pneumatique

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19824788

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2020527382

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19824788

Country of ref document: EP

Kind code of ref document: A1