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WO2024128131A1 - Pneumatique - Google Patents

Pneumatique Download PDF

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Publication number
WO2024128131A1
WO2024128131A1 PCT/JP2023/043851 JP2023043851W WO2024128131A1 WO 2024128131 A1 WO2024128131 A1 WO 2024128131A1 JP 2023043851 W JP2023043851 W JP 2023043851W WO 2024128131 A1 WO2024128131 A1 WO 2024128131A1
Authority
WO
WIPO (PCT)
Prior art keywords
tire
groove
land portion
width direction
sipe
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/JP2023/043851
Other languages
English (en)
Japanese (ja)
Inventor
雅光 松本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yokohama Rubber Co Ltd
Original Assignee
Yokohama Rubber Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yokohama Rubber Co Ltd filed Critical Yokohama Rubber Co Ltd
Priority to DE112023004132.6T priority Critical patent/DE112023004132T5/de
Priority to JP2023579509A priority patent/JP7617485B2/ja
Priority to CN202380078135.7A priority patent/CN120187587A/zh
Publication of WO2024128131A1 publication Critical patent/WO2024128131A1/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
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03—Tread patterns
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1204—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe
    • B60C11/1218—Three-dimensional shape with regard to depth and extending direction
    • 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
    • B60C11/0304—Asymmetric patterns
    • 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
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1236—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern
    • 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
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1204—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe
    • B60C2011/1209—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe straight at the tread surface
    • 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
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1236—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern
    • B60C2011/1254—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern with closed sipe, i.e. not extending to a groove
    • 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
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C2011/129—Sipe density, i.e. the distance between the sipes within the pattern

Definitions

  • This invention relates to tires.
  • Patent Document 1 shows a pneumatic tire that can improve wet steering stability while maintaining exterior noise performance.
  • reducing the groove width and volume of the tread surface is an effective way to improve noise vibration (NV) performance, but reducing the groove width and volume makes it difficult to ensure drainage, resulting in a problem of poor wet grip performance.
  • NV noise vibration
  • the objective of this invention is to provide a tire that can achieve excellent noise performance and wet grip performance.
  • a tire according to one embodiment of the present invention is a tire having a tread surface with an asymmetric tread pattern with the tire equatorial plane as a boundary, the tread pattern being specified in the direction of the vehicle width when mounted on a vehicle, and the tread pattern being formed with first, second, third and fourth main grooves extending in the circumferential direction of the tire and arranged in four in the tire width direction from the inner side in the vehicle width direction to the outer side in the vehicle width direction, with the groove width at least on the outer side in the vehicle width direction being narrower than on the inner side in the vehicle width direction, first, second, third, fourth and fifth land portions partitioned by each of the main grooves and extending in the circumferential direction of the tire in a rib shape and arranged in the tire width direction from the inner side in the vehicle width direction to the outer side in the vehicle width direction, five narrow grooves extending in the circumferential direction of the tire in the fifth land portion, at least one narrow groove in the tire width direction that extends in
  • a plurality of second sipes provided in the tire circumferential direction; a plurality of third sipes extending in the tire width direction and provided in the tire circumferential direction in the third land portion; a plurality of fourth sipes extending in the tire width direction and provided in the tire circumferential direction in the fourth land portion; a fifth sipe, one end of which penetrates the narrow groove but does not penetrate through it, and the other end of which extends outward in the tire width direction and is the only fifth sipe provided in the tire circumferential direction on the outer side in the tire width direction of the narrow groove provided in the fifth land portion; and a fifth sipe, one end of which penetrates the fourth main groove in the fifth land portion and the other end of which extends outward in the tire width direction.
  • the second sipes are at least twice as many as the third sipes and the fourth sipes, the sipes and grooves in the second land portion, the third land portion, and the fourth land portion are inclined in the same direction with respect to the tire width direction, and the first sipe, the fifth sipe, and the fifth lug groove have an inclination in the same direction as the sipes and grooves in the second land portion, the third land portion, and the fourth land portion.
  • This invention can improve noise performance and wet grip performance.
  • FIG. 1 is a meridian cross-sectional view of a pneumatic tire according to an embodiment.
  • FIG. 2 is a plan view of a tread surface of the pneumatic tire according to the embodiment.
  • FIG. 3 is a partially enlarged plan view of a tread surface of the pneumatic tire according to the embodiment.
  • FIG. 4 is a partially enlarged plan view of a tread surface of the pneumatic tire according to the embodiment.
  • FIG. 5 is a schematic perspective view of a sipe of a pneumatic tire according to an embodiment.
  • FIG. 6 is a schematic perspective view of another example of a sipe of the pneumatic tire according to the embodiment.
  • FIG. 7 is a table showing the results of a performance test of the pneumatic tire according to the embodiment.
  • FIG. 8 is a table showing the results of a performance test of the pneumatic tire according to the embodiment.
  • the tire radial direction refers to the direction perpendicular to the tire rotation axis (not shown), which is the rotation axis of the pneumatic tire 1
  • the inner side in the tire radial direction refers to the side toward the tire rotation axis in the tire radial direction
  • the outer side in the tire radial direction refers to the side away from the tire rotation axis in the tire radial direction.
  • the tire circumferential direction refers to the direction around the tire rotation axis as the central axis.
  • the tire width direction refers to the direction parallel to the tire rotation axis
  • the inner side in the tire width direction refers to the side toward the tire equatorial plane (tire equatorial line) CL in the tire width direction
  • the outer side in the tire width direction refers to the side away from the tire equatorial plane CL in the tire width direction.
  • the tire equatorial plane CL is a plane that is perpendicular to the tire rotation axis and passes through the center of the tire width of the pneumatic tire 1, and the tire equatorial plane CL coincides in position in the tire width direction with the tire width centerline, which is the center position in the tire width direction of the pneumatic tire 1.
  • the tire width is the width in the tire width direction between the parts located at the outermost positions in the tire width direction, that is, the distance between the parts farthest from the tire equatorial plane CL in the tire width direction.
  • the tire equatorial line is a line on the tire equatorial plane CL that runs along the tire circumferential direction of the pneumatic tire 1.
  • a cross section in the tire meridian direction is a cross section of the tire cut by a plane that includes the tire rotation axis.
  • the vehicle width direction inner side and vehicle width direction outer side are defined as the directions relative to the vehicle width direction (tire width direction) when the tire is mounted on a vehicle.
  • the pneumatic tire 1 has a mounting direction indicator (not shown) that indicates the direction in which the tire is mounted on the vehicle.
  • the mounting direction indicator is, for example, configured by a mark or unevenness attached to the sidewall of the tire.
  • ECER 30 (Article 30 of the Economic Commission for Europe Regulation) requires that a vehicle mounting direction indicator be provided on the sidewall that is on the outer side in the vehicle width direction when mounted on the vehicle.
  • the orientation of the pneumatic tire 1 of this embodiment relative to the vehicle width direction when mounted on the vehicle is specified.
  • the pneumatic tire 1 of the embodiment has an annular structure centered on the tire rotation axis, and includes a pair of bead cores 11, 11, a pair of bead fillers 12, 12, a carcass layer 13, a belt layer 14, a tread rubber 15, a pair of sidewall rubbers 16, 16, and a pair of rim cushion rubbers 17, 17.
  • the pair of bead cores 11, 11 have an annular structure formed by multiple windings of bead wire made of steel or organic fiber material around the tire circumference, and form the cores of the left and right bead portions.
  • a pair of bead fillers 12, 12 are arranged on the outer periphery of a pair of bead cores 11, 11 in the tire radial direction, forming a bead portion.
  • the carcass layer 13 has a single-layer structure consisting of one carcass ply or a multi-layer structure consisting of multiple carcass plies stacked together, and is toroidally stretched between the left and right bead cores 11, 11 to form the tire's framework. In addition, both ends of the carcass layer 13 are wrapped around and secured to the outside in the tire width direction so as to envelop the bead cores 11 and the bead fillers 12.
  • the carcass plies of the carcass layer 13 are formed by coating multiple carcass cords made of steel or organic fiber material (e.g., aramid, nylon, polyester, rayon, etc.) with coating rubber and rolling them, and have an absolute carcass angle (defined as the inclination angle of the carcass cords in the longitudinal direction relative to the tire circumferential direction) of 80 degrees or more and 95 degrees or less.
  • an absolute carcass angle defined as the inclination angle of the carcass cords in the longitudinal direction relative to the tire circumferential direction
  • the belt layer 14 is formed by laminating a pair of cross belts 141, 142 and a belt cover 143, and is arranged around the outer circumference of the carcass layer 13.
  • the pair of cross belts 141, 142 are formed by coating a plurality of belt cords made of steel or organic fiber material with coating rubber and rolling them, and have a belt angle of 20 degrees or more and 55 degrees or less in absolute value.
  • the pair of cross belts 141, 142 have belt angles of opposite signs (defined as the inclination angle of the belt cords in the longitudinal direction with respect to the tire circumferential direction), and are laminated with the longitudinal directions of the belt cords crossing each other (so-called cross-ply structure).
  • the belt cover 143 is formed by coating a belt cord made of steel or organic fiber material with coating rubber, and has a belt angle of 0 degrees or more and 10 degrees or less in absolute value.
  • the belt cover 143 is, for example, a strip of material made by covering one or more belt cords with coating rubber, and is configured by winding this strip of material spirally around the outer circumferential surface of the cross belts 141 and 142 multiple times in the tire circumferential direction.
  • the tread rubber 15 is disposed on the tire radial outer circumference of the carcass layer 13 and the belt layer 14 to form the tread portion of the tire.
  • the tread rubber 15 forms a tread surface 15a on the outer peripheral surface of the tread portion that comes into contact with the road surface during driving.
  • a pair of sidewall rubbers 16, 16 are positioned on the outer sides of the carcass layer 13 in the tire width direction, forming the left and right sidewall portions.
  • a pair of rim cushion rubbers 17, 17 are positioned on the radially inner side of the bead cores 11, 11 and the turn-wrapped portion of the carcass layer 13, respectively, to form the contact surfaces of the left and right bead portions with the rim flange.
  • the pneumatic tire 1 of the embodiment has a tread pattern 15b on the tread surface 15a.
  • the pneumatic tire 1 of the embodiment shows the tread pattern 15b of an all-season tire.
  • the pneumatic tire 1 of the embodiment shows the tread pattern 15b that is asymmetric in the tire width direction with the tire equatorial plane CL as the boundary.
  • the tread pattern 15b extends along the tire circumferential direction and includes four circumferential main grooves in the tire width direction, the first main groove 21, the second main groove 22, the third main groove 23, and the fourth main groove 24 from the inner side in the vehicle width direction to the outer side in the vehicle width direction.
  • the tread pattern 15b is divided by the four main grooves 21, 22, 23, and 24 and extends in the tire circumferential direction like a rib, and includes five first land portions 31, second land portions 32, third land portions 33, fourth land portions 34, and fifth land portions 35 in the tire width direction from the inner side in the vehicle width direction to the outer side in the vehicle width direction.
  • the first land portion 31 and the fifth land portion 35 are also called shoulder land portions on the outer side in the tire width direction, and the second land portion 32, the third land portion 33, and the fourth land portion 34 are also called center land portions on the inner side in the tire width direction.
  • the tread pattern 15b includes a first sipe 311 in the first land portion 31.
  • the tread pattern 15b includes a second sipe 321 in the second land portion 32.
  • the tread pattern 15b includes a third sipe 331 in the third land portion 33.
  • the tread pattern 15b includes a fourth sipe 341 in the fourth land portion 34.
  • the tread pattern 15b includes a narrow groove 351, a fifth sipe 352, and a fifth lug groove 353 in the fifth land portion 35. As shown in FIG.
  • the tread pattern 15b also includes a second lug groove 322 in the second land portion 32. As shown in FIG. 4, the tread pattern 15b also includes a third lug groove 332 in the third land portion 33. The tread pattern 15b also includes a fourth lug groove 342 in the fourth land portion 34.
  • the main groove is a groove that is required to display a wear indicator as stipulated by JATMA, and generally has a groove width of 4.0 mm or more and a groove depth of 6.5 mm or more.
  • the lug groove is a lateral groove that extends along the tire width direction, generally has a groove width of 1.0 mm or more and less than 6.0 mm, and a groove depth of 3.0 mm or more and less than 6.5 mm, and functions as a groove by opening when the tire is in contact with the ground.
  • the fine groove is a longitudinal groove that extends along the tire circumferential direction, generally has a groove width of 1.0 mm or more and less than 4.0 mm, and a groove depth of 3.0 mm or more and less than 6.5 mm, and functions as a groove by opening when the tire is in contact with the ground.
  • the sipe is a cut formed on the tread surface, generally has a sipe width of less than 1.0 mm and a sipe depth of 2.0 mm or more, and closes when the tire is in contact with the ground.
  • the groove width is measured as the maximum distance between the left and right groove walls on the tread surface when the tire is mounted on a specified rim, inflated to the specified internal pressure, and in an unloaded state.
  • the groove width is measured in a cross-sectional view with the groove length direction as the normal direction, based on the intersection point between the tread surface and the extension of the groove wall.
  • the groove depth is measured as the maximum distance from the tread surface to the bottom of the groove when the tire is mounted on a specified rim, inflated to the specified internal pressure, and in an unloaded state. In addition, if the groove has partial unevenness or sipes at the bottom of the groove, these are excluded from the measurement of the groove depth.
  • the sipe width is measured as the maximum width of the sipe opening on the land tread when the tire is mounted on the specified rim, inflated to the specified internal pressure, and in an unloaded state.
  • the tire contact surface is defined as the contact area between the tire and a flat plate when the tire is mounted on a specified rim, pressurized to a specified internal pressure, and placed perpendicular to a flat plate in a stationary state and subjected to a load corresponding to a specified load.
  • the prescribed rim refers to the "applicable rim” specified by JATMA, the "design rim” specified by TRA, or the “measuring rim” specified by ETRTO.
  • the prescribed internal pressure refers to the "maximum air pressure” specified by JATMA, the maximum value of the “tire load limits at various cold inflation pressures” specified by TRA, or the “inflation pressures” specified by ETRTO.
  • the prescribed load refers to the "maximum load capacity" specified by JATMA, the maximum value of the "tire load limits at various cold inflation pressures” specified by TRA, or the "load capacity” specified by ETRTO.
  • the prescribed internal pressure is 180 kPa, and the prescribed load is 88% of the maximum load capacity.
  • tread pattern 15b The details of the tread pattern 15b are explained below.
  • the first main groove 21, the second main groove 22, the third main groove 23, and the fourth main groove 24 are formed such that the fourth main groove 24, which is the outermost in the vehicle width direction, has the narrowest groove width compared to the other main grooves 21, 22, and 23 from the inner side in the vehicle width direction to the outer side in the vehicle width direction.
  • the main grooves 21, 22, and 23 other than the fourth main groove 24, which is the outermost in the vehicle width direction, are formed to have the same or narrower groove width from the inner side in the vehicle width direction to the outer side in the vehicle width direction.
  • the relationship of the groove width of the main grooves includes, for example, that the first main groove 21 has the widest groove width among the four main grooves, the second main groove 22 and the third main groove 23 have the same groove width narrower than the first main groove 21, and the fourth main groove 24 has the narrowest groove width.
  • the fourth main groove 24 which is the outermost in the vehicle width direction, to have a groove width of 75% or less compared to the first main groove 21, which is the innermost in the vehicle width direction, in order to obtain the effects of the present disclosure.
  • the first sipe 311 of the first land portion 31 is formed with one end penetrating the first main groove 21 and the other end extending outward in the tire width direction.
  • the first sipe 311 is a joint point where one end does not penetrate the first main groove 21. That is, the first sipe 311 is provided at a position where it penetrates the first main groove 21, shifted in the tire circumferential direction so that the second sipe 321 penetrating from the second land portion 32 side is not present opposite on an extension line.
  • a plurality of first sipes 311 are provided in a row in the tire circumferential direction.
  • the first sipes 311 may have uneven pitches in the tire circumferential direction due to pitch variation.
  • This first sipe 311 is the only one formed in the first land portion 31, and no other grooves are formed in the first land portion 31. This is called a sipe base.
  • the first sipe 311 be formed in a three-dimensional shape, like the sipe 101 shown in Figures 5 and 6.
  • the first sipe 311 of the embodiment has the three-dimensional shape of the sipe 101 shown in Figure 6.
  • the sipe 101 shown in FIG. 5 has an opening 101a that opens to the tread surface 15a formed with a curve.
  • the sipe 101 shown in FIG. 5 has sipe walls 101b formed in the tire radial direction facing each other, and at least one of the sipe walls 101b has an unevenness 101c formed thereon.
  • the unevenness 101c is formed as a recess (dimple) in one of the sipe walls 101b.
  • the other sipe wall 101b facing the one sipe wall 101b in which the recess is formed may not have an unevenness formed thereon, and may have a protrusion that enters the dimple. In this way, the sipe 101 shown in FIG. 5 is formed in a three-dimensional shape.
  • the sipe 101 shown in FIG. 6 has an opening 101a that opens to the tread surface 15a formed with a curve.
  • the sipe 101 shown in FIG. 6 has sipe walls 101b formed facing each other along the tire radial direction, and each sipe wall 101b is formed into a wave shape 101d that meanders (or zigzags) toward the tire radial direction. In this way, the sipe 101 shown in FIG. 6 is formed into a three-dimensional shape.
  • the second sipes 321 of the second land portion 32 are formed to extend in the tire width direction as shown in Figs. 2 and 3.
  • the second sipes 321 are arranged in a row in the tire circumferential direction.
  • the second sipes 321 may have uneven pitches in the tire circumferential direction due to pitch variation.
  • the second sipes 321 have more than twice the number of the third sipes 331 and the fourth sipes 341.
  • the second lug grooves 322 of the second land portion 32 are formed to extend in the tire width direction as shown in Fig. 3.
  • the second lug grooves 322 are arranged in a row in the tire circumferential direction.
  • the second lug grooves 322 may have uneven pitches in the tire circumferential direction due to pitch variation. Only the second sipes 321 and the second lug grooves 322 are formed in the second land portion 32.
  • the second lug groove 322 and the second sipe 321 are formed so as to be continuous with each other, as shown in FIG. 3.
  • the second lug groove 322 has one end penetrating the first main groove 21 or the second main groove 22, and the other end terminating in the second land portion 32.
  • the second sipe 321 has one end penetrating the second main groove 22 or the first main groove 21, and the other end penetrating the other end of the second lug groove 322. That is, when one end of the second lug groove 322 penetrates the first main groove 21, the second sipe 321 has one end penetrating the second main groove 22, and the other end penetrating the other end of the second lug groove 322, so as to be continuous with each other.
  • the second sipe 321 has one end penetrating the first main groove 21, and the other end penetrating the other end of the second lug groove 322, so as to be continuous with each other.
  • the pairs of second lug grooves 322 and second sipes 321 that are formed consecutively to each other are formed in a line in the tire circumferential direction.
  • the pairs of second lug grooves 322 and second sipes 321 that are adjacent in the tire circumferential direction are arranged in a staggered pattern along the tire circumferential direction. That is, for a pair of second lug grooves 322 and second sipes 321 in which the second lug groove 322 penetrates into the first main groove 21 and the second sipe 321 penetrates into the second main groove 22, the other pair adjacent in the tire circumferential direction is such that the second lug groove 322 penetrates into the second main groove 22 and the second sipe 321 penetrates into the first main groove 21.
  • pairs of second lug grooves 322 and second sipes 321 that are formed consecutively to each other are arranged in a staggered pattern along the tire circumferential direction, with pairs adjacent in the tire circumferential direction being replaced in the tire width direction.
  • the second lug grooves 322 penetrate the second sipes 321 in a biased manner in the tire circumferential direction.
  • the bias of the second lug grooves 322 is arranged in a staggered manner along the tire circumferential direction.
  • the second lug grooves 322 are arranged in a biased manner on one side of the second sipes 321 in the tire circumferential direction
  • the second lug grooves 322 are arranged in a biased manner on the other side of the second sipes 321 in the tire circumferential direction.
  • the pairs of second lug grooves 322 and second sipes 321 formed consecutively to each other are arranged in a staggered manner along the tire circumferential direction with the bias of the second lug grooves 322 being exchanged between pairs adjacent in the tire circumferential direction.
  • the second land portion 32 may have only the second sipe 321 formed without the second lug groove 322.
  • the second sipe 321 has one end penetrating the first main groove 21 and the other end penetrating the second main groove 22. That is, in the pneumatic tire 1 of the embodiment, if the second sipe 321 does not have the second lug groove 322, the tire width direction length L1 is 100% of the width B2 of the second land portion 32 (see FIG. 2 and FIG. 3).
  • the second lug groove 322 in the pneumatic tire 1 of the embodiment, if the second lug groove 322 is present, it is preferable for the second lug groove 322 to have a tire width direction length L2 of 45% or less of the width B2 of the second land portion 32 (see FIG. 3) in order to obtain the effects of the present disclosure.
  • the third sipes 331 of the third land portion 33 are formed to extend in the tire width direction as shown in Figs. 2 and 4.
  • the third sipes 331 are arranged in a row in the tire circumferential direction.
  • the third sipes 331 may have uneven pitches in the tire circumferential direction due to pitch variations. It is preferable for the third sipes 331 to be formed in a three-dimensional shape, like the sipes 101 shown in Figs. 5 and 6, in order to obtain the effects of the present disclosure.
  • the third sipes 331 of the embodiment are applied with the three-dimensional shape of the sipes 101 shown in Fig. 5.
  • the third lug grooves 332 of the third land portion 33 are formed to extend in the tire width direction as shown in Fig. 4.
  • the third lug grooves 332 are arranged in a row in the tire circumferential direction.
  • the third lug grooves 332 may have uneven pitches in the tire circumferential direction due to pitch variations. Only the third sipes 331 and the third lug grooves 332 are formed in the third land portion 33.
  • third lug grooves 332 and third sipes 331 are formed continuously with each other, as shown in FIG. 4. Specifically, one end of the third lug groove 332 penetrates the second main groove 22 and the other end terminates within the third land portion 33. One end of the third sipe 331 penetrates the other end of the third lug groove 332 and the other end terminates within the third land portion 33. That is, in the set of the third lug groove 332 and the third sipe 331 formed continuously with each other, the third lug groove 332 penetrates the second main groove 22, and the third sipe 331 penetrating this third lug groove 332 terminates within the third land portion 33.
  • the sets of the third lug grooves 332 and the third sipes 331 formed continuously with each other are formed side by side in the tire circumferential direction.
  • the third lug groove 332 is formed with circumferential groove widths W1, W2 expanding from the other end through which the third sipe 331 penetrates to one end through which the second main groove 22 penetrates.
  • the circumferential groove widths W1, W2 be W1/W2 between 5% and 30%.
  • the third land portion 33 may have only the third sipe 331 formed therein, without the third lug groove 332.
  • the third sipe 331 may have a configuration in which both ends terminate at the third land portion 33, as shown in FIG. 2, and a configuration in which one end penetrates the second main groove 22 and the other end terminates within the third land portion 33.
  • the third sipe 331 has the third lug groove 332, one end penetrates the other end of the third lug groove 332 and penetrates the second main groove 22 via the third lug groove 332, and the other end terminates within the third land portion 33.
  • the third sipe 331 in the embodiment of the pneumatic tire 1, it is preferable for the third sipe 331 to be the only one or for the tire width direction length L3 including the third lug groove 332 to be 70% or less of the width B3 of the third land portion 33 in order to obtain the effects of the present disclosure (see FIG. 4).
  • the third lug groove 332 in the pneumatic tire 1 of the embodiment, it is preferable for the third lug groove 332 to have a tire width direction length L4 of 40% or less of the width B3 of the third land portion 33 in order to obtain the effects of the present disclosure (see FIG. 4).
  • the fourth sipes 341 of the fourth land portion 34 are formed to extend in the tire width direction as shown in Figures 2 and 4. Multiple fourth sipes 341 are arranged in a row in the tire circumferential direction. The fourth sipes 341 may have uneven pitches in the tire circumferential direction due to pitch variation.
  • the fourth lug grooves 342 of the fourth land portion 34 are formed to extend in the tire width direction as shown in Figure 4. Multiple fourth lug grooves 342 are arranged in a row in the tire circumferential direction. The fourth lug grooves 342 may have uneven pitches in the tire circumferential direction due to pitch variation. Only the fourth sipes 341 and the fourth lug grooves 342 are formed in the fourth land portion 34.
  • the fourth lug groove 342 and the fourth sipe 341 are formed so as to be continuous with each other, as shown in FIG. 4. Specifically, one end of the fourth lug groove 342 penetrates the third main groove 23, and the other end terminates within the fourth land portion 34. One end of the fourth sipe 341 penetrates the other end of the fourth lug groove 342, and the other end terminates within the fourth land portion 34. That is, the set of the fourth lug groove 342 and the fourth sipe 341 formed so as to be continuous with each other is such that the fourth lug groove 342 penetrates the third main groove 23, and the fourth sipe 341 penetrating the fourth lug groove 342 terminates within the fourth land portion 34.
  • the sets of the fourth lug groove 342 and the fourth sipe 341 formed so as to be continuous with each other are formed in a line in the tire circumferential direction.
  • the fourth lug groove 342 is formed with circumferential groove widths W3, W4 expanding from the other end through which the fourth sipe 341 penetrates to the one end through which the third main groove 23 penetrates.
  • the circumferential groove widths W3, W4 be W3/W4 of 5% or more and 30% or less.
  • the fourth land portion 34 may not have the fourth lug groove 342 and may only have the fourth sipe 341.
  • the fourth sipe 341 may have a configuration in which both ends terminate at the fourth land portion 34, as shown in FIG. 2, and a configuration in which one end penetrates the third main groove 23 and the other end terminates within the fourth land portion 34.
  • the fourth sipe 341 has the fourth lug groove 342
  • one end penetrates the other end of the fourth lug groove 342 and penetrates the third main groove 23 via the fourth lug groove 342, and the other end terminates within the fourth land portion 34.
  • the fourth sipe 341 in the embodiment of the pneumatic tire 1, it is preferable for the fourth sipe 341 to be the only one or for the tire width direction length L5 including the fourth lug groove 342 to be 70% or less of the width B4 of the fourth land portion 34 in order to obtain the effects of the present disclosure (see FIG. 4).
  • the fourth lug groove 342 in the pneumatic tire 1 of the embodiment, it is preferable for the fourth lug groove 342 to have a tire width direction length L6 of 40% or less of the width B4 of the fourth land portion 34 in order to obtain the effects of the present disclosure (see FIG. 4).
  • the narrow groove 351 of the fifth land portion 35 is provided extending in the tire circumferential direction on the tire widthwise outer side of the fourth main groove 24.
  • the narrow groove 351 is formed with a groove width narrower than the fourth main groove 24.
  • the narrow groove 351 is formed with a groove width of 20% or less of the fourth main groove 24.
  • At least one narrow groove 351 is provided in the tire width direction. If there are multiple narrow grooves 351, it is preferable to have about two in order to suppress the generation of noise.
  • the fifth sipe 352 of the fifth land portion 35 is formed with one end penetrating the narrow groove 351 and the other end extending outward in the tire width direction.
  • the fifth sipe 352 is a joint point where one end does not penetrate the narrow groove 351. That is, the fifth sipe 352 is provided at a position where it penetrates the narrow groove 351, shifting its position in the tire circumferential direction so that it does not face on an extension line when there is a sipe or groove penetrating the narrow groove 351 on the inner side in the tire width direction.
  • the fifth sipes 352 are provided in a row in the tire circumferential direction.
  • the fifth sipes 352 may have an unequal pitch in the tire circumferential direction due to pitch variation.
  • This fifth sipe 352 is the only one formed on the outer side in the tire width direction of the narrow groove 351 of the fifth land portion 35, and no other grooves are formed on the outer side in the tire width direction of the narrow groove 351. This is called a sipe base.
  • the fifth sipe 352 be formed in a three-dimensional shape, like the sipe 101 shown in Figures 5 and 6.
  • the fifth sipe 352 of the embodiment has the three-dimensional shape of the sipe 101 shown in Figure 6.
  • the fifth lug groove 353 of the fifth land portion 35 is formed so that one end penetrates the fourth main groove 24 in the fifth land portion 35 and the other end terminates within the fifth land portion 35, and extends in the tire width direction.
  • a plurality of fifth lug grooves 353 are provided in a row in the tire circumferential direction.
  • the fifth lug grooves 353 may have an unequal pitch in the tire circumferential direction due to pitch variation.
  • the second sipe 321, the second lug groove 322, the third sipe 331, the third lug groove 332, the fourth sipe 341, and the fourth lug groove 342 provided in the second land portion 32, the third land portion 33, and the fourth land portion 34, which are the center land portions, are preferably provided with an inclination in the same direction relative to the tire width direction in order to obtain the effects of the present disclosure. Also, in the embodiment of the pneumatic tire 1, as shown in Fig.
  • the first sipe 311, the fifth sipe 352, and the fifth lug groove 353 provided in the first land portion 31 and the fifth land portion 35, which are the shoulder land portions, have an inclination in the same direction as the second sipe 321, the second lug groove 322, the third sipe 331, the third lug groove 332, the fourth sipe 341, and the fourth lug groove 342.
  • the pneumatic tire 1 of the embodiment has a specified orientation with respect to the vehicle width direction when mounted on a vehicle, and has a tread pattern 15b on the tread surface 15a that is asymmetric in the tire width direction with the tire equatorial plane CL as the boundary.
  • the tread pattern 15b includes a first main groove 21, a second main groove 22, a third main groove 23 and a fourth main groove 24 which extend in the circumferential direction of the tire and are provided in four grooves in the tire width direction from the inner side in the vehicle width direction to the outer side in the vehicle width direction, with the groove width at least at the outermost part in the vehicle width direction being narrower than the innermost part in the vehicle width direction; a first land portion 31, a second land portion 32, a third land portion 33, a fourth land portion 34 and a fifth land portion 35 which are partitioned by the main grooves 21, 22, 23 and 24 and extend in the circumferential direction of the tire in a rib shape and are provided in the tire width direction from the inner side in the vehicle width direction to the outer side in the vehicle width direction; at least one narrow groove 351 which extends in the circumferential direction of the tire in the fifth land portion 35 and is provided in the tire width direction and has a groove width narrower than the fourth main groove 24; and a narrow groove 351 which extends in
  • the first sipe 311 being the only one in the first land portion 31 extending in the tire width direction and provided in multiple numbers in the tire circumferential direction;
  • the second sipe 321 being the only one in the first land portion 31 extending in the tire width direction and provided in multiple numbers in the tire circumferential direction in the second land portion 32;
  • the third sipe 331 being the only one in the fourth land portion 34 extending in the tire width direction and provided in multiple numbers in the tire circumferential direction;
  • the fifth sipe 352 being the only one on the tire width direction outer side of the narrow grooves 351 in the fifth land portion 35, one end of which penetrates into the narrow groove 351 but does not pass through, and the other end of which extends outward in the tire width direction and is provided in multiple numbers in the tire circumferential direction;
  • the fifth lug grooves 353 being the only one in the fifth land portion 35, one end of which penetrates into the fourth main groove 24, the other end of which extends outward in the tire width direction, and terminates without penetrating
  • the second sipes 321 have more than twice the number of the third sipes 331 and the fourth sipes 341, the sipes 321, 331, 341, and grooves (322, 332, 342) provided in the second land portion 32, the third land portion 33, and the fourth land portion 34 are inclined in the same direction relative to the tire width direction, and the first sipe 311, the fifth sipe 352, and the fifth lug groove 353 have an inclination in the same direction as the sipes 321, 331, 341, and grooves (322, 332, 342) provided in the second land portion 32, the third land portion 33, and the fourth land portion 34.
  • the groove width of the first main groove 21 is wide on the inner side in the vehicle width direction, and the groove width of the fourth main groove 24 is narrow on the outer side in the vehicle width direction, thereby achieving both drainage performance and pitch noise reduction;
  • the number of second sipes 321 in the second land portion 32 is greater than the third land portion 33 and the fourth land portion 34, thereby achieving both drainage performance and pitch noise reduction;
  • the narrow groove 351 is formed in the fifth land portion 35 on the outer side in the vehicle width direction, which compensates for the narrow groove width of the fourth main groove 24 by providing a groove volume to compensate for the drainage performance on the outer side in the vehicle width direction;
  • the fifth lug groove 353 does not penetrate the narrow groove 351, thereby reducing pitch noise;
  • the second land portion 32 includes a second lug groove 322 having one end penetrating into the first main groove 21 or the second main groove 22 and the other end terminating within the second land portion 32, and the second sipe 321 has one end penetrating into the second main groove 22 or the first main groove 21 and the other end penetrating into the other end of the second lug groove 322.
  • This pneumatic tire 1 can achieve both wet grip performance and noise performance by ensuring the minimum necessary groove volume on the inner side in the vehicle width direction in the second land portion 32 close to the inner side in the vehicle width direction.
  • the second lug grooves 322 and the second sipes 321 that are continuous with each other are arranged in a staggered pattern along the circumferential direction of the tire.
  • the asymmetric tread pattern 15b reduces the difference in drainage caused by reversing the direction of rotation during tire rotation, improving wet grip performance.
  • the second lug grooves 322 penetrate the second sipes 321 in a biased manner in the tire circumferential direction, and the bias is arranged in a staggered pattern along the tire circumferential direction.
  • This pneumatic tire 1 reduces pitch noise by dispersing the period around the tire circumference, improving noise performance.
  • the third sipe 331 has one end penetrating the second main groove 22 and the other end terminating within the third land portion 33
  • the fourth sipe 341 has one end penetrating the third main groove 23 and the other end terminating within the fourth land portion 34.
  • This pneumatic tire 1 can improve noise performance by preventing pumping noise from leaking to the outside.
  • the pneumatic tire 1 of the embodiment includes a third lug groove 332 having one end penetrating the second main groove 22 in the third land portion 33 and the other end terminating within the third land portion 33, and a fourth lug groove 342 having one end penetrating the third main groove 23 in the fourth land portion 34 and the other end terminating within the fourth land portion 34, one end of the third sipe 331 penetrating the other end of the third lug groove 332 and penetrating the second main groove 22 via the third lug groove 332, and one end of the fourth sipe 341 penetrating the other end of the fourth lug groove 342 and penetrating the third main groove 23 via the fourth lug groove 342.
  • This pneumatic tire 1 ensures a minimum necessary amount of groove volume, allowing for both wet grip performance and noise performance.
  • the third lug groove 332 is formed with a circumferential groove width that expands from the other end to one end
  • the fourth lug groove 342 is formed with a circumferential groove width that expands from the other end to one end.
  • This pneumatic tire 1 also ensures the minimum necessary groove volume, allowing wet grip performance and noise performance to be achieved at the same time.
  • the third sipe 331 has a three-dimensional shape.
  • This pneumatic tire 1 can suppress uneven wear in the third land portion 33 on the inner side in the tire width direction by ensuring rigidity, while also ensuring drainage.
  • the first sipe 311 and the fifth sipe 352 have a three-dimensional shape.
  • This pneumatic tire 1 prevents the first land portion 31 and the fifth land portion 35 on the outer side in the tire width direction from collapsing, prevents heel-and-toe wear in the tire circumferential direction between the sipes, reduces pitch noise, and improves noise performance.
  • a pneumatic tire has been described as an example of a tire.
  • the present invention is not limited to this, and the configuration described in this embodiment can be arbitrarily applied to other tires within the scope of what is obvious to those skilled in the art. Examples of other tires include airless tires.
  • FIGS. 7 and 8 are diagrams showing the results of performance tests of pneumatic tires according to the embodiment. Below, performance evaluation tests conducted on a conventional pneumatic tire, a comparative pneumatic tire, and an example pneumatic tire according to the embodiment are described. The performance evaluation tests were conducted on noise performance and wet grip performance.
  • all four main grooves have the same groove width, there are no narrow grooves, the ratio of the second sipe to the third sipe and the fourth sipe is the same, the first sipe penetrates the groove, and the fifth lug groove penetrates and is continuous with the fifth sipe.
  • the first main groove of the four main grooves has the widest groove width
  • the second and third main grooves have the same groove width narrower than the first main groove
  • the fourth main groove has the narrowest groove width
  • the ratio of the second sipes to the third and fourth sipes is twice as large
  • the first and fifth sipes are provided penetrating the grooves without penetrating them
  • a fifth lug groove is provided penetrating only the fourth main groove.
  • other characteristic points are specified for the pneumatic tires of Examples 2 to 15.
  • the pneumatic tires of Comparative Example 1 to Comparative Example 4 differ in some of the specifications from the pneumatic tire of Example 1.
  • the pneumatic tire of this embodiment has improved noise performance and wet grip performance compared to the conventional tire.
  • invention 1 A tire having an asymmetric tread pattern on a tread surface, the orientation of which is specified relative to the vehicle width direction when mounted on a vehicle, the tire having an asymmetric tread pattern with the tire equatorial plane as a boundary,
  • the tread pattern is First, second, third and fourth main grooves extending in the tire circumferential direction and provided in the tire width direction from the inner side in the vehicle width direction to the outer side in the vehicle width direction, the groove width of at least the outermost groove in the vehicle width direction being narrower than that of the innermost groove in the vehicle width direction;
  • First, second, third, fourth and fifth land portions are partitioned by the main grooves, extend in a rib shape in the tire circumferential direction, and are provided in the tire width direction from the inner side in the vehicle width direction to the outer side in the vehicle width direction;
  • At least one narrow groove is provided in the fifth land portion, extending in the tire circumferential direction and in the tire width direction, and has a groove width narrower than that of the
  • the second land portion includes a second lug groove, one end of which penetrates the first main groove or the second main groove and the other end of which terminates within the second land portion,
  • the second sipe has one end penetrating into the second main groove or the first main groove, and the other end penetrating into the other end of the second lug groove.
  • the second lug grooves and the second sipes which penetrate each other are arranged in a staggered manner along the tire circumferential direction. A tire according to claim 2.
  • the second lug grooves penetrate the second sipes in a circumferential direction of the tire in a biased manner, and the bias is arranged in a staggered manner along the circumferential direction of the tire.
  • the third sipe has one end penetrating the second main groove and the other end terminating within the third land portion
  • the fourth sipe has one end penetrating the third main groove and the other end terminating within the fourth land portion.
  • the third lug groove is formed such that a circumferential groove width increases from the other end to the one end
  • the fourth lug groove is formed such that a circumferential groove width increases from the other end to the one end.
  • the first sipe and the fifth sipe have a three-dimensional shape.

Landscapes

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

Abstract

Le but de la présente invention est d'atteindre d'excellentes performances en termes de bruit, de vibration et d'adhérence sur sol mouillé. La présente invention comprend : une première rainure principale (21), une deuxième rainure principale (22), une troisième rainure principale (23) et une quatrième rainure principale (24) qui sont formées de telle sorte que la largeur de la rainure la plus proche de l'extérieur dans le sens de la largeur du pneumatique est plus étroite que la largeur de la rainure la plus proche de l'intérieur dans le sens de la largeur du pneumatique ; une première partie d'appui (31), une deuxième partie d'appui (32), une troisième partie d'appui (33), une quatrième partie d'appui (34) et une cinquième partie d'appui (35) qui sont disposées de l'intérieur dans le sens de la largeur du pneumatique vers l'extérieur dans le sens de la largeur du pneumatique ; une rainure étroite (351) dans la cinquième partie d'appui (35) ; des premières lamelles (311) ayant chacune une extrémité qui pénètre dans la première rainure principale (21) mais qui ne la traverse pas ; des deuxièmes lamelles (321) ; des troisièmes lamelles (331) ; des quatrièmes lamelles (341) ; des cinquièmes lamelles (352) ayant chacune une extrémité qui pénètre dans la rainure étroite (351) mais qui ne la traverse pas ; et des cinquièmes rainures de barrette (353). Les deuxièmes lamelles (321) sont au moins deux fois plus nombreuses que les lamelles (331, 341). Les lamelles (321, 341, 351) s'inclinent dans la même direction par rapport au sens de la largeur du pneumatique. Les premières lamelles (311), les cinquièmes lamelles (352) et les cinquièmes rainures de barrette (353) ont chacune une inclinaison dans la même direction.
PCT/JP2023/043851 2022-12-14 2023-12-07 Pneumatique Ceased WO2024128131A1 (fr)

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JP2023579509A JP7617485B2 (ja) 2022-12-14 2023-12-07 タイヤ
CN202380078135.7A CN120187587A (zh) 2022-12-14 2023-12-07 轮胎

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018151108A1 (fr) * 2017-02-14 2018-08-23 横浜ゴム株式会社 Pneumatique
JP2019073062A (ja) * 2017-10-12 2019-05-16 横浜ゴム株式会社 空気入りタイヤ
JP2019137334A (ja) * 2018-02-14 2019-08-22 横浜ゴム株式会社 空気入りタイヤ
JP2019209874A (ja) * 2018-06-06 2019-12-12 Ｔｏｙｏ Ｔｉｒｅ株式会社 空気入りタイヤ
JP2020001659A (ja) * 2018-07-02 2020-01-09 横浜ゴム株式会社 空気入りタイヤ
JP2020097326A (ja) * 2018-12-18 2020-06-25 Ｔｏｙｏ Ｔｉｒｅ株式会社 空気入りタイヤ
JP2020100169A (ja) * 2018-12-19 2020-07-02 横浜ゴム株式会社 空気入りタイヤ

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018151108A1 (fr) * 2017-02-14 2018-08-23 横浜ゴム株式会社 Pneumatique
JP2019073062A (ja) * 2017-10-12 2019-05-16 横浜ゴム株式会社 空気入りタイヤ
JP2019137334A (ja) * 2018-02-14 2019-08-22 横浜ゴム株式会社 空気入りタイヤ
JP2019209874A (ja) * 2018-06-06 2019-12-12 Ｔｏｙｏ Ｔｉｒｅ株式会社 空気入りタイヤ
JP2020001659A (ja) * 2018-07-02 2020-01-09 横浜ゴム株式会社 空気入りタイヤ
JP2020097326A (ja) * 2018-12-18 2020-06-25 Ｔｏｙｏ Ｔｉｒｅ株式会社 空気入りタイヤ
JP2020100169A (ja) * 2018-12-19 2020-07-02 横浜ゴム株式会社 空気入りタイヤ

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JP7617485B2 (ja) 2025-01-20
JPWO2024128131A1 (fr) 2024-06-20

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