WO2020008996A1 - Tire - Google Patents

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Publication number
WO2020008996A1
WO2020008996A1 PCT/JP2019/025623 JP2019025623W WO2020008996A1 WO 2020008996 A1 WO2020008996 A1 WO 2020008996A1 JP 2019025623 W JP2019025623 W JP 2019025623W WO 2020008996 A1 WO2020008996 A1 WO 2020008996A1
Authority
WO
WIPO (PCT)
Prior art keywords
groove
tire
vertical groove
vertical
width direction
Prior art date
Application number
PCT/JP2019/025623
Other languages
French (fr)
Japanese (ja)
Inventor
明宏 川喜田
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
Publication of WO2020008996A1 publication Critical patent/WO2020008996A1/en

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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
    • B60C11/0302—Tread patterns directional pattern, i.e. with main rolling 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

Definitions

  • the present invention relates to a tire.
  • Priority is claimed on Japanese Patent Application No. 2018-127649 filed on July 4, 2018, the content of which is incorporated herein by reference.
  • Patent Document 1 On a tread tread portion, gradually extending toward one side in the tire circumferential direction from the tire equator portion side toward the outside in the tire width direction, and in the tire circumferential direction.
  • the present invention has been made in view of the above circumstances, and has as its object to provide a tire capable of improving the grip performance on snow.
  • the tire according to the present invention includes a tread tread portion, and the tread tread portion has a V-shape that crosses or approaches the tire equator near the tire equator in plan view as viewed from the outside in the tire radial direction.
  • a plurality of inclined grooves arranged in the tire direction, a 2ND longitudinal groove connecting the inclined grooves adjacent to each other in the tire circumferential direction, and the inclined plane positioned outside the 2ND longitudinal groove in the tire width direction and adjacent in the tire circumferential direction.
  • a shoulder vertical groove connecting the grooves is formed, and the 2ND vertical grooves adjacent in the tire circumferential direction are arranged so that the positions in the tire width direction are different from each other, and the 2ND vertical grooves are formed in the tire circumferential direction.
  • a first longitudinal groove connected to one of the inclined grooves adjacent to the first inclined groove, and a tire longitudinal direction and a tire circumferential direction arranged at different positions with respect to the first longitudinal groove; Way around Comprising a second longitudinal groove connected to the other of the inclined groove of the inclined grooves adjacent a first step groove for connecting the second circumferential groove and the first longitudinal groove, with.
  • the grip performance on snow can be improved.
  • the tire 1 may be employed, for example, as a winter tire (snow tire) traveling on an icy or snowy road surface, or for high-speed traveling on an autobahn in Europe.
  • the tire 1 has a tread portion 15 located at an outer end portion in the tire radial direction, a pair of sidewall portions 16 extending inward in the tire radial direction from both ends of the tread portion 15 in the tire width direction, and a sidewall portion.
  • a bead portion 17 connected to the inner end portion in the tire radial direction at 16.
  • a bead core 17 a is embedded in the bead portion 17.
  • a belt 18 is embedded in the tread portion 15.
  • the outer circumferential surface of the tread portion 15 facing outward in the tire radial direction is the tread tread portion 11.
  • a carcass ply 19 is integrally embedded in the tread portion 15, the sidewall portion 16, and the bead portion 17.
  • the carcass ply 19 is folded around the bead core 17a.
  • an unillustrated portion such as an arrow is formed, for example, which can specify the rotation direction R of the tire 1 when the vehicle on which the tire 1 is mounted moves forward.
  • This explicit portion is formed on, for example, the outer surface of the sidewall portion 16 of the tire 1.
  • the tire 1 includes a tread tread portion 11, and an inclined groove 12, a 2ND vertical groove 13, and a shoulder vertical groove 14 are formed in the tread tread portion 11.
  • the tread tread portion 11 means, for example, that the tire 1 is mounted on a standard rim specified in “JATMA Year Book” and the tire 1 has a maximum size in the applicable size and ply rating in “JATMA Year Book”.
  • Contact of the tread with a maximum load capacity loaded by filling with 100% internal pressure (hereinafter referred to as specified internal pressure) of the air pressure (maximum air pressure) corresponding to the load capacity (bold load in the internal pressure-load capacity correspondence table) Refers to the ground.
  • the tread tread portion 11 is formed of an industrial standard (for example, “TRA Year Book” in the United States, “ETRTO Standard Manual” in Europe). Etc.) in accordance with the standard.
  • the inclined groove 12 has a V-shape that intersects or approaches in the vicinity of the tire equator CL in plan view as viewed from the outside in the tire radial direction.
  • the vicinity of the tire equator CL means, for example, about 10% of the total length (hereinafter referred to as tread width) W of the tread tread 11 from the tire equator CL along the tire width direction. It refers to a region located inward in the tire width direction from a position separated in the width direction.
  • a plurality of inclined grooves 12 are arranged in the tire circumferential direction.
  • the inclined groove 12 is arranged over the entire area of the tread tread portion 11 in the tire width direction.
  • the inclined groove 12 gradually extends toward the front in the rotation direction R from the outside in the tire width direction toward the tire equator CL.
  • the inclined groove 12 includes a first inclined groove 21 that gradually extends toward the rear side of the rotation direction R from the tire equatorial portion CL side toward one side (the right side in FIG. 1) in the tire width direction, and a tire equatorial portion CL.
  • a second inclined groove 22 that gradually extends toward the rear side in the rotation direction R from the side toward the other side (the left side in FIG. 1) in the tire width direction.
  • a plurality of the first inclined grooves 21 and the second inclined grooves 22 are respectively arranged on the tread tread portion 11 at equal intervals in the tire circumferential direction.
  • first inclined groove 21 and the second inclined groove 22 are curved so as to project rearward in the rotation direction R in the plan view.
  • the width of each of the first inclined groove 21 and the second inclined groove 22 gradually decreases from the outside in the tire width direction toward the tire equator CL.
  • the inner end of the first inclined groove 21 on the tire equator CL side is located on the other side in the tire width direction from the tire equator CL, and the inner end of the second inclined groove 22 on the tire equator CL side is the tire. It is located on one side in the tire width direction from the equator CL. Thereby, the inclined groove 12 and the tire equator CL intersect in the plan view.
  • the inner end of the first inclined groove 21 is located on the rear side in the rotation direction R from the inner end of the second inclined groove 22, and is connected to the second inclined groove 22.
  • the angle between the first inclined groove 21 and the second inclined groove 22 is 50 ° or more and 140 ° or less, preferably 70 ° or more and 110 ° or less, and is about 90 ° in the illustrated example. I have.
  • the depth of the outer portion 22c located outside in the tire width direction is closer to the tire equator portion CL than the connection portion 22a to which the inner end of the first inclined groove 21 is connected.
  • the inner portion 22d and the connecting portion 22a are deeper than the respective depths.
  • the depth of the inner end portion 22b in the tire width direction of the outer portion 22c of the second inclined groove 22 is gradually reduced from the outside to the inside in the tire width direction.
  • the inner end of the second inclined groove 22 of the inclined groove 12 located on the rear side of the rotation direction R is the second end of the inclined groove 12 located on the front side of the rotation direction R. It is connected to one inclined groove 21.
  • a tire width is set to a connection portion 21 a to which the inner end of the second inclined groove 22 of the inclined groove 12 located behind the first inclined groove 21 in the rotation direction R is connected.
  • the depth of the outer portion 21c located outside in the direction is deeper than each depth of the inner portion 21d located on the tire equator CL side and the connection portion 21a.
  • the depth of the inner end portion 21b in the tire width direction of the outer portion 21c of the first inclined groove 21 is gradually reduced from the outside to the inside in the tire width direction.
  • the inclination angle of the inner portions 21d, 22d with respect to the tire circumferential direction is smaller than the inclination angle of the outer portions 21c, 22c with respect to the tire circumferential direction, For example, it is about 30 ° to 45 °.
  • the # 2ND vertical groove 13 connects the inclined grooves 12 adjacent to each other in the tire circumferential direction.
  • the 2ND vertical grooves 13 are separately arranged on both sides sandwiching the tire equator CL in the tire width direction.
  • the 2ND vertical groove 13 connects the outer portions 21c and 22c adjacent to each other in the tire circumferential direction in each of the first inclined groove 21 and the second inclined groove 22.
  • the 2ND vertical groove 13 is disposed on the tread tread portion 11 at a portion located on the inner side in the tire width direction from a position about 1/4 of the tread width W in the tire width direction from the tire equator portion CL.
  • the 2ND vertical grooves 13 adjacent in the tire circumferential direction are arranged so that the positions in the tire width direction are different from each other.
  • the openings that open to the same inclined groove 12 are separated in the tire width direction. That is, the opening of the 2ND vertical groove 13 in the inclined groove 12 faces the tire circumferential direction side surface of the inner surface defining the inclined groove 12 over the entire area.
  • the 2ND vertical grooves 13 adjacent in the tire circumferential direction are arranged in a staggered manner.
  • the groove width of the # 2ND vertical groove 13 is, for example, 3 mm or more and 13 mm or less, preferably 4 mm or more and 7 mm or less, and is equal over the entire length.
  • the shift amount in the tire width direction between the 2ND vertical grooves 13 adjacent in the tire circumferential direction is 1.0 times or more and 2.0 times or less the groove width of the 2ND vertical grooves 13. That is, the 2ND vertical grooves 13 adjacent in the tire circumferential direction are arranged at positions that do not overlap in the tire width direction.
  • the groove width of the 2ND vertical groove 13 is equal to or less than the groove width of at least the connection portion 12a with the 2ND vertical groove 13 among the inclined grooves 12.
  • the groove width of the 2ND vertical groove 13 is wider than the groove width of the inner portions 21d and 22d in the first inclined groove 21 and the second inclined groove 22, respectively.
  • the depth of the # 2ND vertical groove 13 is equal over the entire length.
  • the depth of the 2ND vertical groove 13 is smaller than the depth of the outer portions 21c and 22c in the first inclined groove 21 and the second inclined groove 22, respectively.
  • the depth of the 2ND vertical groove 13 is 0.4 times or more and 1.0 times or less, preferably 0.5 times or more and 0.9 times or less of the depth of the outer portions 21c and 22c.
  • the depth of the 2ND vertical groove 13 is equal to the depth of the inner portions 21d and 22d in the first inclined groove 21 and the second inclined groove 22, respectively.
  • the 2ND vertical groove 13 is formed between the first vertical groove 25 connected to one of the inclined grooves 12 adjacent to each other in the tire circumferential direction, and the first vertical groove 25 with respect to the tire width direction and the tire circumferential direction. Are arranged so as to be different from each other, and are connected to the other inclined groove 12 of the inclined grooves 12 adjacent in the tire circumferential direction, the first longitudinal groove 25, the second longitudinal groove 26, And a first step groove 27 for connecting the two.
  • the lengths of the first vertical groove 25 and the second vertical groove 26 are equal to each other and longer than the first step groove 27.
  • each length of the first vertical groove 25 and the second vertical groove 26 is at least twice the length of the first step groove 27.
  • the size of the first step groove 27 in the tire circumferential direction is 0.03 times or more and 0.3 times or less, preferably 0.05 times or more and 0.2 times or less of the size of the 2ND vertical groove 13 in the tire circumferential direction. Has become.
  • the shift amount of the first vertical groove 25 and the second vertical groove 26 in the tire width direction is smaller than the groove width of the 2ND vertical groove 13.
  • the shift amount of the first vertical groove 25 and the second vertical groove 26 in the tire width direction is 0.2 times or more and 0.8 times or less, preferably 0.3 times or more and 0.7 times of the groove width of the 2ND vertical groove 13. It is as follows.
  • the inclination angle of the first step groove 27 with respect to the tire width direction is from 25 ° to 65 °, preferably from 30 ° to 60 °.
  • the first vertical groove 25 is located on the front side in the rotation direction R with respect to the second vertical groove 26 and inside the tire width direction.
  • the inclination angles of the first step groove 27 and the outer portions 21c and 22c with respect to the tire circumferential direction are equal to each other.
  • the positions in the tire width direction of the outer end edges in the tire width direction are equal to each other.
  • the shoulder vertical groove 14 is located outside the 2ND vertical groove 13 in the tire width direction, and connects the inclined grooves 12 adjacent to each other in the tire circumferential direction.
  • the shoulder longitudinal grooves 14 are separately arranged on both sides sandwiching the tire equator CL in the tire width direction.
  • the shoulder vertical groove 14 connects the outer portions 21c and 22c adjacent to each other in the tire circumferential direction in the first inclined groove 21 and the second inclined groove 22, respectively.
  • An interval in the tire width direction between the shoulder vertical groove 14 and the 2ND vertical groove 13 adjacent in the tire width direction is larger than a shift amount in the tire width direction between the adjacent 2ND vertical grooves 13 in the tire circumferential direction.
  • each opening portion opening to the same inclined groove 12 is apart in the tire width direction.
  • the opening of the shoulder vertical groove 14 in the inclined groove 12 faces the side surface facing the tire circumferential direction among the inner surfaces defining the inclined groove 12 over the entire area.
  • the shoulder vertical grooves 14 are arranged in a staggered manner in the tire circumferential direction.
  • the groove width of the shoulder vertical groove 14 is equal over the entire length.
  • the groove width of the shoulder vertical groove 14 is smaller than the groove width of the 2ND vertical groove 13.
  • the depth of the shoulder vertical groove 14 is equal over the entire length.
  • the shoulder longitudinal groove 14 is connected to the third longitudinal groove 31 connected to one of the inclined grooves 12 adjacent to each other in the tire circumferential direction. And a fourth vertical groove 32 connected to the other inclined groove 12 of the inclined grooves 12 adjacent in the tire circumferential direction, a third vertical groove 31 and a fourth vertical groove 32. , And a second step groove 33 for connecting
  • Each length of the third vertical groove 31 and the fourth vertical groove 32 is equal to each other, and is longer than the second step groove 33.
  • each length of the third vertical groove 31 and the fourth vertical groove 32 is twice or more the length of the second step groove 33.
  • the size of the second step groove 33 in the tire circumferential direction is 0.03 times or more and 0.3 times or less, preferably 0.05 times or more and 0.2 times or less of the shoulder circumferential groove 14 in the tire circumferential direction. Has become.
  • the shift amount of the third vertical groove 31 and the fourth vertical groove 32 in the tire width direction is equal to or larger than the groove width of the shoulder vertical groove 14.
  • the amount of deviation between the third longitudinal groove 31 and the fourth longitudinal groove 32 in the tire width direction is 0.2 times or more and 0.8 times or less, preferably 0.3 times or more and 0.7 times the groove width of the shoulder longitudinal grooves 14. It is as follows.
  • the inclination angle of the second step groove 33 with respect to the tire width direction is from 25 ° to 65 °, preferably from 30 ° to 60 °.
  • the third vertical groove 31 is located on the front side in the rotation direction R with respect to the fourth vertical groove 32 and on the inner side in the tire width direction.
  • the outer shoulder vertical grooves 35 located on the outer side in the tire width direction are compared with the inner shoulder vertical grooves 36 located on the inner side in the tire width direction.
  • the groove width is narrow and the depth is shallow.
  • the inner shoulder vertical groove 36 has a smaller groove width and the same depth as the 2ND vertical groove 13.
  • the outer edge in the tire width direction of the fourth vertical groove 32 of the inner shoulder vertical groove 36 is located inside the inner edge of the third vertical groove 31 of the outer shoulder vertical groove 35 in the tire width direction in the tire width direction. I have.
  • the groove width of the outer shoulder vertical groove 35 is 0.1 to 0.6 times, preferably 0.2 to 0.5 times the groove width of the 2ND vertical groove 13.
  • the outer shoulder vertical groove 35 has a smaller groove width and a smaller depth than the inner portions 21d and 22d in the first inclined groove 21 and the second inclined groove 22, respectively.
  • the groove width of the outer shoulder vertical groove 35 is 0.1 to 0.8 times, preferably 0.3 to 0.6 times the groove width of the inner portions 21d and 22d.
  • the outer shoulder longitudinal groove 35 is located outside the tire equator CL in the tire width direction at a position about 1/4 of the tread width W in the tire width direction.
  • the outer shoulder vertical groove 35 is adjacent to the 2ND vertical groove 13 located outside in the tire width direction in the tire width direction among the plurality of 2ND vertical grooves 13 arranged in a staggered manner in the tire circumferential direction, and the inner shoulder vertical groove.
  • Numeral 36 is adjacent to the 2ND vertical groove 13 located inside the tire width direction in the tire width direction among the plurality of 2ND vertical grooves 13 arranged in a staggered manner in the tire circumferential direction.
  • the front side surface located on the front side in the rotation direction R includes a first side surface 51 having a 2ND vertical groove 13 opened at an inner end in the tire width direction, and a first side surface 51.
  • a step surface 53 that connects the inner edge of the first side surface 51 in the tire width direction and the outer edge of the second side surface 52 in the tire width direction and faces outward in the tire width direction is provided.
  • the inclination angle of the first side surface 51 with respect to the tire width direction is smaller than the inclination angle of the second side surface 52 with respect to the tire width direction.
  • a connection portion 55 of the third side surface 54 located on the outer side in the tire width direction with the first side surface 51 is formed in a curved shape protruding inward in the tire width direction.
  • the radius of curvature of the connection portion 55 is 2 mm or more and 20 mm or less, and preferably 3 mm or more and 10 mm or less in a plan view as viewed from the outside in the tire radial direction.
  • the second side surface 52 and the step surface 53 are connected at an acute angle.
  • the angle formed by the second side surface 52 and the step surface 53 is not less than 25 ° and not more than 80 °, preferably not less than 35 ° and not more than 60 °.
  • the second side surface 52 and the step surface 53 may be connected via a projecting curved surface portion.
  • the size of the step surface 53 in the tire circumferential direction is 1.0 mm or more and 6.0 mm or less, preferably 1.5 mm or more and 4.0 mm or less.
  • the size of the step surface 53 in the tire circumferential direction is 0.5 times or more and 1.5 times or less, preferably 0.8 times or more and 1.3 times or less of the groove width of the inclined groove 12 at the connection portion 12a. I have.
  • the step surface 53 is located away from the tire equator CL by 0.05 to 0.35 times, preferably 0.1 to 0.3 times the tread width W in the tire width direction.
  • the step surface 53 is connected to the rear end of the rotation direction R on the fourth side surface 56 located on the inner side in the tire width direction in the inner surface defining the 2ND vertical groove 13 without any step in the tire circumferential direction.
  • a plurality of land portions 41 to 48 are defined in the tread tread portion 11 by the inclined grooves 12, 2ND vertical grooves 13, and shoulder vertical grooves 14, and a plurality of sipes 38a to 38h are formed in each of the land portions 41 to 48.
  • a specific description will be given.
  • the first center land portion 41 located between the first inclined grooves 21 adjacent to each other in the tire circumferential direction and partitioned into the 2ND vertical groove 13 and the inner portion 22d of the second inclined groove 22 has the planar view.
  • a plurality of first sipes 38a extending in a direction substantially perpendicular to the first inclined groove 21 are formed.
  • the second center land portion 42, which is located between the second inclined grooves 22 adjacent in the tire circumferential direction and is divided into the 2ND vertical groove 13 and the inner portion 21 d of the first inclined groove 21, has the planar view.
  • a plurality of second sipes 38b extending in a direction substantially orthogonal to the second inclined groove 22 are formed.
  • a corner formed by the second side surface 52 and the step surface 53 is located. are doing.
  • the first intermediate land portion 43 which is located between the first inclined grooves 21 adjacent to each other in the tire circumferential direction and is partitioned by the 2ND vertical groove 13 and the outer shoulder vertical groove 35 has an inner side and an outer side in the tire width direction.
  • a plurality of third sipes 38c are formed that gradually extend toward the front side in the rotational direction R and have a smaller inclination angle with respect to the tire width direction than the first sipes 38a in the plan view.
  • the second intermediate land portion 44 located between the first inclined grooves 21 adjacent to each other in the tire circumferential direction and divided into the 2ND vertical groove 13 and the inner shoulder vertical groove 36 has a first sipe in a plan view.
  • a plurality of fourth sipes 38d extending substantially parallel to 38a are formed.
  • the third intermediate land portion 45 positioned between the second inclined grooves 22 adjacent to each other in the tire circumferential direction and partitioned into the 2ND vertical groove 13 and the outer shoulder vertical groove 35 has an inner side and an outer side in the tire width direction.
  • a plurality of fifth sipes 38e are formed which gradually extend toward the front side in the rotational direction R and have a smaller inclination angle with respect to the tire width direction than the second sipes 38b in plan view.
  • a fourth intermediate land portion 46 located between the second inclined grooves 22 adjacent to each other in the tire circumferential direction and partitioned into the 2ND vertical groove 13 and the inner shoulder vertical groove 36 has a second sipe in a plan view.
  • a plurality of sixth sipes 38f extending substantially parallel to 38b are formed.
  • the first shoulder land portion 47 located between the first inclined grooves 21 adjacent to each other in the tire circumferential direction and partitioned by the shoulder vertical groove 14 includes A plurality of seventh sipes 38g extending along the one inclined groove 21 and first narrow grooves 47a are formed.
  • the first narrow groove 47a is connected to the fourth vertical groove 32 in a land portion defined by the outer shoulder vertical groove 35 of the first shoulder land portion 47, and is formed in a land portion defined by the inner shoulder vertical groove 36 in the first shoulder land portion 47.
  • a bottom raising portion 47b is formed at an inner end of the first narrow groove 47a in the tire width direction.
  • the second shoulder land portion 48 partitioned by the shoulder longitudinal groove 14 includes A plurality of eighth sipes 38h extending along the two inclined grooves 22 and second narrow grooves 48a are formed.
  • the second narrow groove 48a is connected to the fourth vertical groove 32 at the land portion defined by the outer shoulder vertical groove 35 of the second shoulder land portion 48, and is formed at the land portion defined by the inner shoulder vertical groove 36.
  • a raised bottom portion 48b is formed at the inner end of the second narrow groove 48a in the tire width direction.
  • the 2ND vertical grooves 13 adjacent to each other in the tire circumferential direction are arranged at positions different from each other in the tire width direction.
  • the connection portion 12a of the groove 12 with the 2ND vertical groove 13 and the snow that has entered the 2ND vertical groove 13 face the opening of the 2ND vertical groove 13 in the tire circumferential direction on the inner surface defining the inclined groove 12.
  • the 2ND vertical groove 13 includes the first step groove 27 connecting the first vertical groove 25 and the second vertical groove 26 having different positions in the tire width direction, the vehicle has entered the 2ND vertical groove 13 during traveling on snow.
  • the snow can be kept in the 2ND vertical groove 13 without slipping out in the tire circumferential direction, and the grip performance on snow can be reliably improved.
  • the 2ND vertical groove 13 which is located on the inner side in the tire width direction and in which a hard snow column is easily formed as compared with the shoulder vertical groove 14 includes the first step groove 27, so that the grip performance on snow is effectively improved. Can be improved.
  • the tread tread portion 11 is formed with a V-shaped inclined groove 12 that intersects or is close to the tire equator portion CL in plan view when viewed from the outside in the tire radial direction, so that drainage performance and Steering stability when traveling on snow can be compatible.
  • the groove width of at least the connection portion 12a with the 2ND vertical groove 13 of the inclined groove 12 is equal to or greater than the groove width of the 2ND vertical groove 13, when traveling on snow, the connection portion 12a of the inclined groove 12 A lot of snow can enter, and the grip performance on snow can be reliably improved.
  • the shoulder vertical groove 14 includes the second step groove 33 that connects the third vertical groove 31 and the fourth vertical groove 32 which are different from each other in the width direction of the tire, the shoulder vertical groove 14 is defined and 2ND
  • the first intermediate land portion 43, the second intermediate land portion 44, the third intermediate land portion 45, the fourth intermediate land portion 46, the first shoulder land portion 47, and the first intermediate land portion 43 located outside the longitudinal groove 13 in the tire width direction.
  • An edge portion that is sharp in the tire width direction is formed in the two shoulder land portion 48, and the turning performance on snow can be improved.
  • the shoulder vertical groove 14 includes the second step groove 33, the snow that has entered the shoulder vertical groove 14 during running on snow is locked in the second step groove 33 so that the snow does not escape in the tire circumferential direction. , Can be retained in the shoulder vertical groove 14, and the grip performance on snow can be reliably improved.
  • the groove width of the 2ND vertical groove 13 is wider than the groove width of the shoulder vertical groove 14, it is possible to allow a large amount of snow to enter the 2ND vertical groove 13 during traveling on snow, and the 2ND vertical groove 13 becomes the first Along with the provision of the step groove 27, a large snow column shear force is generated, and the grip performance on snow can be reliably improved.
  • the groove width of the 2ND vertical groove 13 is wider than the groove width of the shoulder vertical groove 14, when running on a wet road surface, when the water of the inclined groove 12 reaches the opening of the 2ND vertical groove 13, , It is easy to be introduced into the 2ND vertical groove 13, and the drainage performance can be improved.
  • the groove width of the shoulder vertical groove 14 is smaller than the groove width of the 2ND vertical groove 13, during cornering, of the inner surfaces defining the shoulder vertical groove 14, the side surfaces facing each other in the tire width direction abut or touch each other. This makes it possible to increase the rigidity of the land portion by bringing them closer to each other, thereby improving the turning performance.
  • the inclined groove 12 gradually extends toward the front side in the rotation direction R from the outside in the tire width direction toward the tire equator CL side, when traveling on a wet road surface, the inclined groove 12 Of these, water located in a portion that continues to the 2ND vertical groove 13 from the outside in the tire width direction flows toward the tire equator CL side and enters the 2ND vertical groove 13.
  • the first vertical groove 25 is located on the front side in the rotation direction R with respect to the second vertical groove 26 and on the inner side in the tire width direction, the first vertical groove 25 is inserted into the 2ND vertical groove 13 from the inclined groove 12.
  • the water that has entered through the two vertical grooves 26 passes through the first step grooves 27 and the first vertical grooves 25 in this order without generating a reverse flow toward the outside in the tire width direction.
  • the 2ND vertical groove 13 is provided with the first vertical groove 25, the second vertical groove 26, and the first step groove 27, and while the grip performance on snow is improved, it is possible to suppress a decrease in drainage performance. .
  • first vertical groove 25 located on the front side in the rotation direction R with respect to the second vertical groove 26 is located inside the second vertical groove 26 in the tire width direction, and is located outside the tire width direction.
  • the first center land portion 41, the second center land portion 42, the first intermediate land portion 43, the second intermediate land portion 44, the third intermediate land portion defined by the 2ND flute 13 45 and the fourth intermediate land portion 46 can be prevented from being easily worn.
  • the front side surface of the inclined groove 12 has an inner edge in the tire width direction on the first side surface 51 and an outer edge in the tire width direction on the second side surface 52 located behind the inner edge in the rotation direction R. Since it is provided with a stepped surface 53 connecting the edge and the outside and facing the outside in the tire width direction, the opening of the 2ND vertical groove 13 from the outside in the tire width direction in the inclined groove 12 when running on a wet road surface. Reaches the step surface 53, the water is smoothly introduced into the 2ND vertical groove 13, and the drainage performance can be improved.
  • the second side surface 52 and the step surface 53 are connected at an acute angle in the plan view, the water that reaches the opening of the 2ND vertical groove 13 from the outside in the tire width direction in the inclined groove 12 is formed. Can be reliably introduced into the 2ND vertical groove 13. Also, of the inner surface defining the 2ND vertical groove 13, a connection portion 55 of the third side surface 54 located outside in the tire width direction with the first side surface 51 has a curved surface protruding inward in the tire width direction. Therefore, water reaching the opening of the 2ND vertical groove 13 from the outside in the tire width direction in the inclined groove 12 can be more reliably introduced into the 2ND vertical groove 13.
  • the front side surface located on the front side in the rotation direction R includes the first side surface 51, the second side surface 52, and the step surface 53.
  • a configuration in which the front side surface extends smoothly over the entire length may be employed.
  • the connection portion 55 of the 2ND vertical groove 13 with the first side surface 51 on the third side surface 54 may extend straight in the tire circumferential direction.
  • the shoulder vertical groove 14 may extend straight in the tire circumferential direction.
  • the inclined groove 12 may not cross the tire equator CL and may be separated from the tire equator CL, and the first inclined groove 21 and the second inclined groove 22 do not need to intersect.
  • the 2ND vertical grooves adjacent in the tire circumferential direction are arranged so that the positions in the tire width direction are different from each other. Therefore, when traveling on snow, the connecting portion of the inclined grooves with the 2ND vertical grooves, and the 2ND vertical grooves The snow that has entered the tire can be kept in the tire circumferential direction by abutting it against the portion of the inner surface that defines the inclined groove that faces the opening of the 2ND vertical groove in the tire circumferential direction. It is possible to improve the grip performance on snow by generating a snow column shear force.
  • the 2ND vertical groove includes the first step groove connecting the first vertical groove and the second vertical groove which are different from each other in the tire width direction, the snow entering the 2ND vertical groove during traveling on snow can be removed by the first vertical groove.
  • the tire By locking in the step groove, the tire can be kept in the 2ND vertical groove without slipping out in the tire circumferential direction, and the grip performance on snow can be surely improved.
  • the 2ND vertical groove which is located on the inner side in the tire width direction and in which a hard snow column is easily formed has the first step groove, so that the grip performance on snow is effectively improved.
  • the tread portion has a V-shaped inclined groove that intersects or approaches the tire equator portion in plan view when viewed from the outside in the tire radial direction, the drainage performance and the running performance on snow The steering stability can be compatible.
  • At least a groove width of a connection portion with the 2ND vertical groove may be equal to or larger than a groove width of the 2ND vertical groove.
  • At least the groove width of the connection portion with the 2ND vertical groove is equal to or greater than the groove width of the 2ND vertical groove, so that a large amount of snow enters the connection portion of the inclined groove during traveling on snow. It is possible to reliably improve the grip performance on snow.
  • the shoulder longitudinal groove has a third longitudinal groove connected to one of the inclined grooves adjacent to each other in the tire circumferential direction, and a tire longitudinal direction and a tire circumferential direction with respect to the third longitudinal groove.
  • a fourth vertical groove connected to the other of the inclined grooves adjacent to each other in the tire circumferential direction, and a third vertical groove and the fourth vertical groove.
  • a second-stage groove for connecting the two.
  • the shoulder vertical groove has a second step groove connecting the third vertical groove and the fourth vertical groove which are different from each other in the position in the tire width direction, the shoulder vertical groove is defined, and the tire is more than the 2ND vertical groove. An edge portion that is sharp in the tire width direction is formed on the land portion located outside in the width direction, and the turning performance on snow can be improved.
  • the shoulder vertical groove has the second step groove, when the vehicle travels on snow, the snow that has entered the shoulder vertical groove is locked in the second step groove so that the snow does not escape in the tire circumferential direction. , It is possible to reliably improve the grip performance on snow.
  • the width of the 2ND vertical groove may be wider than the width of the shoulder vertical groove.
  • the groove width of the 2ND vertical groove is wider than the groove width of the shoulder vertical groove, it is possible to allow a large amount of snow to enter the 2ND vertical groove when traveling on snow, and the 2ND vertical groove replaces the first step groove. In combination with the provision, a large snow column shear force is generated, and the grip performance on snow can be reliably improved. Further, since the width of the 2ND vertical groove is wider than the width of the shoulder vertical groove, when the water of the inclined groove reaches the opening of the 2ND vertical groove while traveling on a wet road surface, the 2ND vertical groove is not used. It can be easily introduced into the inside, and the drainage performance can be improved.
  • the groove width of the shoulder vertical groove is smaller than the groove width of the 2ND vertical groove, during turning, of the inner surfaces defining the shoulder vertical groove, the side surfaces facing each other in the tire width direction abut or approach each other, Land portion rigidity can be increased, and turning performance can be improved.
  • the tire further includes an indicating portion that indicates a rotation direction of the tire that advances the vehicle.
  • the inclined groove gradually extends toward the front side in the rotation direction from the outside in the tire width direction toward the tire equator portion, and
  • the vertical groove may be located on the front side in the rotation direction with respect to the second vertical groove, and on the inner side in the tire width direction.
  • the 2ND vertical groove includes the first vertical groove, the second vertical groove, and the first step groove, so that the grip performance on snow is improved, but it is possible to suppress a decrease in drainage performance.
  • the first longitudinal groove located on the front side in the rotation direction with respect to the second longitudinal groove is located inside the second longitudinal groove in the tire width direction, and is located outside the tire width direction. Since there is no land portion, the land portion defined by the 2ND flute can be suppressed from being easily worn.

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

Abstract

This tire is provided with a tread part (11), inclined grooves (12), 2ND longitudinal grooves (13), and shoulder longitudinal grooves (14) are formed in the tread part (11), the 2ND longitudinal grooves (13) adjacent to each other in the tire circumferential direction are disposed in mutually different positions in the tire width direction, and the 2ND longitudinal grooves are provided with first longitudinal grooves (25) connected to one inclined groove among inclined grooves adjacent to each other in the tire circumferential direction, second longitudinal grooves (26) disposed at different positions in the tire width direction and tire circumferential direction than the first longitudinal grooves and connected to the other inclined groove of the inclined grooves adjacent to each other in the tire circumferential direction, and first stepped grooves (27) for connecting the first longitudinal grooves and the second longitudinal grooves.

Description

タイヤtire
　本発明は、タイヤに関する。
本願は、２０１８年７月４日に日本に出願された特願２０１８－１２７６４９号に基づき優先権を主張し、その内容をここに援用する。 The present invention relates to a tire.
Priority is claimed on Japanese Patent Application No. 2018-127649 filed on July 4, 2018, the content of which is incorporated herein by reference.
　従来から、例えば下記特許文献１に示されるような、トレッド踏面部に、タイヤ赤道部側からタイヤ幅方向の外側に向かうに従い漸次、タイヤ周方向の一方側に向けて延びるとともに、タイヤ周方向に間隔をあけて配置された複数の傾斜溝と、タイヤ周方向で隣り合う傾斜溝同士を接続するショルダー縦溝と、が形成されたタイヤが知られている。 Conventionally, for example, as shown in Patent Document 1 below, on a tread tread portion, gradually extending toward one side in the tire circumferential direction from the tire equator portion side toward the outside in the tire width direction, and in the tire circumferential direction. 2. Description of the Related Art A tire is known in which a plurality of inclined grooves arranged at intervals and a shoulder vertical groove connecting adjacent inclined grooves in the tire circumferential direction are formed.
日本国特開２０１４－１５１７８６号公報Japanese Patent Application Laid-Open No. 2014-151786
　しかしながら、前記従来のタイヤでは、雪上グリップ性能を向上させることに改善の余地がある。 However, in the conventional tire, there is room for improvement in improving the grip performance on snow.
　本発明は、前述した事情に鑑みてなされたものであって、雪上グリップ性能を向上させることができるタイヤを提供することを目的とする。 The present invention has been made in view of the above circumstances, and has as its object to provide a tire capable of improving the grip performance on snow.

　本発明に係るタイヤは、トレッド踏面部を備え、前記トレッド踏面部に、タイヤ径方向の外側から見た平面視でタイヤ赤道部付近で交差する、若しくは近接するＶ字状を呈するとともに、タイヤ周方向に複数配置された傾斜溝と、タイヤ周方向で隣り合う前記傾斜溝同士を接続する２ＮＤ縦溝と、前記２ＮＤ縦溝よりタイヤ幅方向の外側に位置し、タイヤ周方向で隣り合う前記傾斜溝同士を接続するショルダー縦溝と、が、形成され、タイヤ周方向で隣り合う前記２ＮＤ縦溝は、タイヤ幅方向の位置を互いに異ならせて配置され、前記２ＮＤ縦溝は、タイヤ周方向で隣り合う前記傾斜溝のうちの一方の前記傾斜溝に接続された第１縦溝と、前記第１縦溝に対して、タイヤ幅方向およびタイヤ周方向の各位置を異ならせて配置され、タイヤ周方向で隣り合う前記傾斜溝のうちの他方の前記傾斜溝に接続された第２縦溝と、前記第１縦溝と前記第２縦溝とを接続する第１段溝と、を備える。
The tire according to the present invention includes a tread tread portion, and the tread tread portion has a V-shape that crosses or approaches the tire equator near the tire equator in plan view as viewed from the outside in the tire radial direction. A plurality of inclined grooves arranged in the tire direction, a 2ND longitudinal groove connecting the inclined grooves adjacent to each other in the tire circumferential direction, and the inclined plane positioned outside the 2ND longitudinal groove in the tire width direction and adjacent in the tire circumferential direction. And a shoulder vertical groove connecting the grooves is formed, and the 2ND vertical grooves adjacent in the tire circumferential direction are arranged so that the positions in the tire width direction are different from each other, and the 2ND vertical grooves are formed in the tire circumferential direction. A first longitudinal groove connected to one of the inclined grooves adjacent to the first inclined groove, and a tire longitudinal direction and a tire circumferential direction arranged at different positions with respect to the first longitudinal groove; Way around Comprising a second longitudinal groove connected to the other of the inclined groove of the inclined grooves adjacent a first step groove for connecting the second circumferential groove and the first longitudinal groove, with.
　この発明によれば、雪上グリップ性能を向上させることができる。 According to the present invention, the grip performance on snow can be improved.
本発明の一実施形態に係るタイヤのトレッド踏面部の平面図である。It is a top view of a tread tread part of a tire concerning one embodiment of the present invention. 図１に示すタイヤのタイヤ幅方向に沿う断面図である。It is sectional drawing which follows the tire width direction of the tire shown in FIG.
　以下、図１および図２を参照し、本発明の一実施形態に係るタイヤ１を説明する。
　タイヤ１は、例えば氷雪路面を走行する冬用タイヤ（スノータイヤ）、若しくは欧州のアウトバーンなどでの高速走行用として採用してもよい。
　タイヤ１は、タイヤ径方向の外端部に位置するトレッド部１５と、トレッド部１５におけるタイヤ幅方向の両端部からタイヤ径方向の内側に向けて延びる一対のサイドウォール部１６と、サイドウォール部１６におけるタイヤ径方向の内端部に接続されたビード部１７と、を備える。ビード部１７に、ビードコア１７ａが埋設されている。トレッド部１５に、ベルト１８が埋設されている。トレッド部１５のうち、タイヤ径方向の外側を向く外周面が、トレッド踏面部１１となっている。トレッド部１５、サイドウォール部１６、およびビード部１７に、カーカスプライ１９が一体に埋設されている。カーカスプライ１９は、ビードコア１７ａ回りに折り返されている。タイヤ１の外表面に、タイヤ１が装着された車両が前進するときのタイヤ１の回転方向Ｒが特定可能な例えば矢印等の図示されない明示部が形成されている。この明示部は、タイヤ１の例えばサイドウォール部１６の外表面に形成される。
　タイヤ１は、トレッド踏面部１１を備え、トレッド踏面部１１に、傾斜溝１２と、２ＮＤ縦溝１３と、ショルダー縦溝１４と、が形成されている。 Hereinafter, a tire 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.
The tire 1 may be employed, for example, as a winter tire (snow tire) traveling on an icy or snowy road surface, or for high-speed traveling on an autobahn in Europe.
The tire 1 has a tread portion 15 located at an outer end portion in the tire radial direction, a pair of sidewall portions 16 extending inward in the tire radial direction from both ends of the tread portion 15 in the tire width direction, and a sidewall portion. And a bead portion 17 connected to the inner end portion in the tire radial direction at 16. A bead core 17 a is embedded in the bead portion 17. A belt 18 is embedded in the tread portion 15. The outer circumferential surface of the tread portion 15 facing outward in the tire radial direction is the tread tread portion 11. A carcass ply 19 is integrally embedded in the tread portion 15, the sidewall portion 16, and the bead portion 17. The carcass ply 19 is folded around the bead core 17a. On the outer surface of the tire 1, an unillustrated portion such as an arrow is formed, for example, which can specify the rotation direction R of the tire 1 when the vehicle on which the tire 1 is mounted moves forward. This explicit portion is formed on, for example, the outer surface of the sidewall portion 16 of the tire 1.
The tire 1 includes a tread tread portion 11, and an inclined groove 12, a 2ND vertical groove 13, and a shoulder vertical groove 14 are formed in the tread tread portion 11.
　ここで、トレッド踏面部１１とは、例えば、タイヤ１を「ＪＡＴＭＡ　Ｙｅａｒ　Ｂｏｏｋ」に規定されている標準リムに装着し、かつタイヤ１に、「ＪＡＴＭＡ　Ｙｅａｒ　Ｂｏｏｋ」での適用サイズ・プライレーティングにおける最大負荷能力（内圧－負荷能力対応表の太字荷重）に対応する空気圧（最大空気圧）の１００％の内圧（以下、規定内圧という）を充填して最大負荷能力を負荷した状態でのトレッド部の接地面をいう。
　なおトレッド踏面部１１は、タイヤ１が生産または使用される地域が日本国以外の場合、その地域に適用されている産業規格（例えば、アメリカ合衆国の「ＴＲＡ　Ｙｅａｒ　Ｂｏｏｋ」、欧州の「ＥＴＲＴＯ　Ｓｔａｎｄａｒｄ　Ｍａｎｕａｌ」等）に準拠した状態でのトレッド部の接地面をいう。 Here, the tread tread portion 11 means, for example, that the tire 1 is mounted on a standard rim specified in “JATMA Year Book” and the tire 1 has a maximum size in the applicable size and ply rating in “JATMA Year Book”. Contact of the tread with a maximum load capacity loaded by filling with 100% internal pressure (hereinafter referred to as specified internal pressure) of the air pressure (maximum air pressure) corresponding to the load capacity (bold load in the internal pressure-load capacity correspondence table) Refers to the ground.
When the region where the tire 1 is manufactured or used is other than Japan, the tread tread portion 11 is formed of an industrial standard (for example, “TRA Year Book” in the United States, “ETRTO Standard Manual” in Europe). Etc.) in accordance with the standard.
　傾斜溝１２は、タイヤ径方向の外側から見た平面視でタイヤ赤道部ＣＬ付近で交差する、若しくは近接するＶ字状を呈する。なお、タイヤ赤道部ＣＬ付近とは、例えば、トレッド踏面部１１において、タイヤ赤道部ＣＬから、トレッド踏面部１１のタイヤ幅方向に沿った全長（以下、トレッド幅という）Ｗの約１０％、タイヤ幅方向に離れた位置よりタイヤ幅方向の内側に位置する領域をいう。
　傾斜溝１２は、タイヤ周方向に複数配置されている。傾斜溝１２は、トレッド踏面部１１におけるタイヤ幅方向の全域にわたって配置されている。傾斜溝１２は、タイヤ幅方向の外側からタイヤ赤道部ＣＬ側に向かうに従い漸次、前記回転方向Ｒの前側に向けて延びている。 The inclined groove 12 has a V-shape that intersects or approaches in the vicinity of the tire equator CL in plan view as viewed from the outside in the tire radial direction. The vicinity of the tire equator CL means, for example, about 10% of the total length (hereinafter referred to as tread width) W of the tread tread 11 from the tire equator CL along the tire width direction. It refers to a region located inward in the tire width direction from a position separated in the width direction.
A plurality of inclined grooves 12 are arranged in the tire circumferential direction. The inclined groove 12 is arranged over the entire area of the tread tread portion 11 in the tire width direction. The inclined groove 12 gradually extends toward the front in the rotation direction R from the outside in the tire width direction toward the tire equator CL.
　傾斜溝１２は、タイヤ赤道部ＣＬ側からタイヤ幅方向の一方側（図１の右側）に向かうに従い漸次、前記回転方向Ｒの後側に向けて延びる第１傾斜溝２１と、タイヤ赤道部ＣＬ側からタイヤ幅方向の他方側（図１の左側）に向かうに従い漸次、前記回転方向Ｒの後側に向けて延びる第２傾斜溝２２と、を備える。第１傾斜溝２１および第２傾斜溝２２はそれぞれ、トレッド踏面部１１にタイヤ周方向に等間隔をあけて複数配置されている。 The inclined groove 12 includes a first inclined groove 21 that gradually extends toward the rear side of the rotation direction R from the tire equatorial portion CL side toward one side (the right side in FIG. 1) in the tire width direction, and a tire equatorial portion CL. A second inclined groove 22 that gradually extends toward the rear side in the rotation direction R from the side toward the other side (the left side in FIG. 1) in the tire width direction. A plurality of the first inclined grooves 21 and the second inclined grooves 22 are respectively arranged on the tread tread portion 11 at equal intervals in the tire circumferential direction.
　第１傾斜溝２１および第２傾斜溝２２は、前記平面視で、前記回転方向Ｒの後側に突となるように湾曲している。第１傾斜溝２１および第２傾斜溝２２の各溝幅は、タイヤ幅方向の外側からタイヤ赤道部ＣＬ側に向かうに従い漸次、狭くなっている。 １The first inclined groove 21 and the second inclined groove 22 are curved so as to project rearward in the rotation direction R in the plan view. The width of each of the first inclined groove 21 and the second inclined groove 22 gradually decreases from the outside in the tire width direction toward the tire equator CL.
　第１傾斜溝２１におけるタイヤ赤道部ＣＬ側の内端部は、タイヤ赤道部ＣＬよりタイヤ幅方向の他方側に位置し、第２傾斜溝２２におけるタイヤ赤道部ＣＬ側の内端部は、タイヤ赤道部ＣＬよりタイヤ幅方向の一方側に位置している。これにより、前記平面視で、傾斜溝１２とタイヤ赤道部ＣＬとは交差している。第１傾斜溝２１の内端部は、第２傾斜溝２２の内端部より前記回転方向Ｒの後側に位置し、第２傾斜溝２２に接続されている。前記平面視で、第１傾斜溝２１と第２傾斜溝２２とがなす角度は、５０°以上１４０°以下、好ましくは７０°以上１１０°以下とされ、図示の例では約９０°となっている。 The inner end of the first inclined groove 21 on the tire equator CL side is located on the other side in the tire width direction from the tire equator CL, and the inner end of the second inclined groove 22 on the tire equator CL side is the tire. It is located on one side in the tire width direction from the equator CL. Thereby, the inclined groove 12 and the tire equator CL intersect in the plan view. The inner end of the first inclined groove 21 is located on the rear side in the rotation direction R from the inner end of the second inclined groove 22, and is connected to the second inclined groove 22. In the plan view, the angle between the first inclined groove 21 and the second inclined groove 22 is 50 ° or more and 140 ° or less, preferably 70 ° or more and 110 ° or less, and is about 90 ° in the illustrated example. I have.
　第２傾斜溝２２において、第１傾斜溝２１の内端部が接続された接続部分２２ａに対して、タイヤ幅方向の外側に位置する外側部分２２ｃの深さは、タイヤ赤道部ＣＬ側に位置する内側部分２２ｄ、および前記接続部分２２ａの各深さより深い。第２傾斜溝２２の前記外側部分２２ｃにおけるタイヤ幅方向の内端部２２ｂの深さは、タイヤ幅方向の外側から内側に向かうに従い漸次、浅くなっている。 In the second inclined groove 22, the depth of the outer portion 22c located outside in the tire width direction is closer to the tire equator portion CL than the connection portion 22a to which the inner end of the first inclined groove 21 is connected. The inner portion 22d and the connecting portion 22a are deeper than the respective depths. The depth of the inner end portion 22b in the tire width direction of the outer portion 22c of the second inclined groove 22 is gradually reduced from the outside to the inside in the tire width direction.
　タイヤ周方向で隣り合う傾斜溝１２において、前記回転方向Ｒの後側に位置する傾斜溝１２の第２傾斜溝２２の内端部が、前記回転方向Ｒの前側に位置する傾斜溝１２の第１傾斜溝２１に接続されている。
　第１傾斜溝２１において、この第１傾斜溝２１より前記回転方向Ｒの後側に位置する傾斜溝１２の第２傾斜溝２２の内端部が接続された接続部分２１ａに対して、タイヤ幅方向の外側に位置する外側部分２１ｃの深さは、タイヤ赤道部ＣＬ側に位置する内側部分２１ｄ、および前記接続部分２１ａの各深さより深い。第１傾斜溝２１の前記外側部分２１ｃにおけるタイヤ幅方向の内端部２１ｂの深さは、タイヤ幅方向の外側から内側に向かうに従い漸次、浅くなっている。前記平面視において、第１傾斜溝２１および第２傾斜溝２２それぞれにおいて、前記内側部分２１ｄ、２２ｄのタイヤ周方向に対する傾斜角度は、前記外側部分２１ｃ、２２ｃのタイヤ周方向に対する傾斜角度より小さく、例えば約３０°～４５°となっている。 In the inclined grooves 12 adjacent in the tire circumferential direction, the inner end of the second inclined groove 22 of the inclined groove 12 located on the rear side of the rotation direction R is the second end of the inclined groove 12 located on the front side of the rotation direction R. It is connected to one inclined groove 21.
In the first inclined groove 21, a tire width is set to a connection portion 21 a to which the inner end of the second inclined groove 22 of the inclined groove 12 located behind the first inclined groove 21 in the rotation direction R is connected. The depth of the outer portion 21c located outside in the direction is deeper than each depth of the inner portion 21d located on the tire equator CL side and the connection portion 21a. The depth of the inner end portion 21b in the tire width direction of the outer portion 21c of the first inclined groove 21 is gradually reduced from the outside to the inside in the tire width direction. In the plan view, in each of the first inclined groove 21 and the second inclined groove 22, the inclination angle of the inner portions 21d, 22d with respect to the tire circumferential direction is smaller than the inclination angle of the outer portions 21c, 22c with respect to the tire circumferential direction, For example, it is about 30 ° to 45 °.
　２ＮＤ縦溝１３は、タイヤ周方向で隣り合う傾斜溝１２同士を接続している。２ＮＤ縦溝１３は、タイヤ赤道部ＣＬをタイヤ幅方向に挟む両側に各別に配置されている。２ＮＤ縦溝１３は、第１傾斜溝２１および第２傾斜溝２２それぞれにおいて、タイヤ周方向で隣り合う前記外側部分２１ｃ、２２ｃ同士を接続している。２ＮＤ縦溝１３は、トレッド踏面部１１において、タイヤ赤道部ＣＬから、タイヤ幅方向にトレッド幅Ｗの約１／４離れた位置よりタイヤ幅方向の内側に位置する部分に配置されている。 The # 2ND vertical groove 13 connects the inclined grooves 12 adjacent to each other in the tire circumferential direction. The 2ND vertical grooves 13 are separately arranged on both sides sandwiching the tire equator CL in the tire width direction. The 2ND vertical groove 13 connects the outer portions 21c and 22c adjacent to each other in the tire circumferential direction in each of the first inclined groove 21 and the second inclined groove 22. The 2ND vertical groove 13 is disposed on the tread tread portion 11 at a portion located on the inner side in the tire width direction from a position about 1/4 of the tread width W in the tire width direction from the tire equator portion CL.
　タイヤ周方向で隣り合う２ＮＤ縦溝１３は、タイヤ幅方向の位置を互いに異ならせて配置されている。タイヤ周方向で隣り合う２ＮＤ縦溝１３それぞれにおける、同一の傾斜溝１２に開口する各開口部は、タイヤ幅方向に離れている。すなわち、傾斜溝１２における２ＮＤ縦溝１３の開口部は、その全域にわたって、傾斜溝１２を画成する内面のうち、タイヤ周方向を向く側面に対向している。タイヤ周方向で隣り合う２ＮＤ縦溝１３は、千鳥状に配置されている。 ２ The 2ND vertical grooves 13 adjacent in the tire circumferential direction are arranged so that the positions in the tire width direction are different from each other. In each of the 2ND vertical grooves 13 adjacent to each other in the tire circumferential direction, the openings that open to the same inclined groove 12 are separated in the tire width direction. That is, the opening of the 2ND vertical groove 13 in the inclined groove 12 faces the tire circumferential direction side surface of the inner surface defining the inclined groove 12 over the entire area. The 2ND vertical grooves 13 adjacent in the tire circumferential direction are arranged in a staggered manner.
　２ＮＤ縦溝１３の溝幅は、例えば３ｍｍ以上１３ｍｍ以下、好ましくは４ｍｍ以上７ｍｍ以下とされ、全長にわたって同等になっている。タイヤ周方向で隣り合う２ＮＤ縦溝１３のタイヤ幅方向のずれ量は、２ＮＤ縦溝１３の溝幅の１．０倍以上２．０倍以下となっている。つまり、タイヤ周方向で隣り合う２ＮＤ縦溝１３は、タイヤ幅方向で重複しない位置に配設されている。２ＮＤ縦溝１３の溝幅は、傾斜溝１２のうち、少なくとも２ＮＤ縦溝１３との接続部分１２ａの溝幅以下となっている。２ＮＤ縦溝１３の溝幅は、第１傾斜溝２１および第２傾斜溝２２それぞれにおける前記内側部分２１ｄ、２２ｄの溝幅より広くなっている。 The groove width of the # 2ND vertical groove 13 is, for example, 3 mm or more and 13 mm or less, preferably 4 mm or more and 7 mm or less, and is equal over the entire length. The shift amount in the tire width direction between the 2ND vertical grooves 13 adjacent in the tire circumferential direction is 1.0 times or more and 2.0 times or less the groove width of the 2ND vertical grooves 13. That is, the 2ND vertical grooves 13 adjacent in the tire circumferential direction are arranged at positions that do not overlap in the tire width direction. The groove width of the 2ND vertical groove 13 is equal to or less than the groove width of at least the connection portion 12a with the 2ND vertical groove 13 among the inclined grooves 12. The groove width of the 2ND vertical groove 13 is wider than the groove width of the inner portions 21d and 22d in the first inclined groove 21 and the second inclined groove 22, respectively.
　２ＮＤ縦溝１３の深さは、全長にわたって同等になっている。２ＮＤ縦溝１３の深さは、第１傾斜溝２１および第２傾斜溝２２それぞれにおける前記外側部分２１ｃ、２２ｃの深さより浅くなっている。２ＮＤ縦溝１３の深さは、前記外側部分２１ｃ、２２ｃの深さの０．４倍以上１．０倍以下、好ましくは０．５倍以上０．９倍以下となっている。２ＮＤ縦溝１３の深さは、第１傾斜溝２１および第２傾斜溝２２それぞれにおける前記内側部分２１ｄ、２２ｄの深さと同等になっている。 The depth of the # 2ND vertical groove 13 is equal over the entire length. The depth of the 2ND vertical groove 13 is smaller than the depth of the outer portions 21c and 22c in the first inclined groove 21 and the second inclined groove 22, respectively. The depth of the 2ND vertical groove 13 is 0.4 times or more and 1.0 times or less, preferably 0.5 times or more and 0.9 times or less of the depth of the outer portions 21c and 22c. The depth of the 2ND vertical groove 13 is equal to the depth of the inner portions 21d and 22d in the first inclined groove 21 and the second inclined groove 22, respectively.
　２ＮＤ縦溝１３は、タイヤ周方向で隣り合う傾斜溝１２のうちの一方の傾斜溝１２に接続された第１縦溝２５と、第１縦溝２５に対して、タイヤ幅方向およびタイヤ周方向の各位置を異ならせて配置され、タイヤ周方向で隣り合う傾斜溝１２のうちの他方の傾斜溝１２に接続された第２縦溝２６と、第１縦溝２５と第２縦溝２６とを接続する第１段溝２７と、を備える。　 The 2ND vertical groove 13 is formed between the first vertical groove 25 connected to one of the inclined grooves 12 adjacent to each other in the tire circumferential direction, and the first vertical groove 25 with respect to the tire width direction and the tire circumferential direction. Are arranged so as to be different from each other, and are connected to the other inclined groove 12 of the inclined grooves 12 adjacent in the tire circumferential direction, the first longitudinal groove 25, the second longitudinal groove 26, And a first step groove 27 for connecting the two.
　第１縦溝２５および第２縦溝２６の各長さは、互いに同等とされ、かつ第１段溝２７より長くなっている。例えば、第１縦溝２５および第２縦溝２６の各長さは、第１段溝２７の長さの２倍以上となっている。第１段溝２７のタイヤ周方向の大きさは、２ＮＤ縦溝１３のタイヤ周方向の大きさの０．０３倍以上０．３倍以下、好ましくは０．０５倍以上０．２倍以下となっている。第１縦溝２５および第２縦溝２６のタイヤ幅方向のずれ量は、２ＮＤ縦溝１３の溝幅未満となっている。第１縦溝２５および第２縦溝２６のタイヤ幅方向のずれ量は、２ＮＤ縦溝１３の溝幅の０．２倍以上０．８倍以下、好ましくは０．３倍以上０．７倍以下となっている。第１段溝２７のタイヤ幅方向に対する傾斜角度は、２５°以上６５°以下、好ましくは３０°以上６０°以下となっている。 The lengths of the first vertical groove 25 and the second vertical groove 26 are equal to each other and longer than the first step groove 27. For example, each length of the first vertical groove 25 and the second vertical groove 26 is at least twice the length of the first step groove 27. The size of the first step groove 27 in the tire circumferential direction is 0.03 times or more and 0.3 times or less, preferably 0.05 times or more and 0.2 times or less of the size of the 2ND vertical groove 13 in the tire circumferential direction. Has become. The shift amount of the first vertical groove 25 and the second vertical groove 26 in the tire width direction is smaller than the groove width of the 2ND vertical groove 13. The shift amount of the first vertical groove 25 and the second vertical groove 26 in the tire width direction is 0.2 times or more and 0.8 times or less, preferably 0.3 times or more and 0.7 times of the groove width of the 2ND vertical groove 13. It is as follows. The inclination angle of the first step groove 27 with respect to the tire width direction is from 25 ° to 65 °, preferably from 30 ° to 60 °.
　第１縦溝２５は、第２縦溝２６に対して前記回転方向Ｒの前側で、かつタイヤ幅方向の内側に位置している。第１段溝２７、および前記外側部分２１ｃ、２２ｃそれぞれのタイヤ周方向に対する傾斜角度は、互いに同等になっている。タイヤ周方向に千鳥状に配置された複数の２ＮＤ縦溝１３のうち、タイヤ幅方向の外側に位置する２ＮＤ縦溝１３の第１縦溝２５におけるタイヤ幅方向の内端縁、およびタイヤ幅方向の内側に位置する２ＮＤ縦溝１３の第２縦溝２６におけるタイヤ幅方向の外端縁それぞれのタイヤ幅方向の位置が互いに同等になっている。 The first vertical groove 25 is located on the front side in the rotation direction R with respect to the second vertical groove 26 and inside the tire width direction. The inclination angles of the first step groove 27 and the outer portions 21c and 22c with respect to the tire circumferential direction are equal to each other. Of the plurality of 2ND vertical grooves 13 arranged in a staggered manner in the tire circumferential direction, the inner edge of the first vertical groove 25 of the 2ND vertical groove 13 located outside in the tire width direction, and the tire width direction In the second vertical groove 26 of the 2ND vertical groove 13 located inside the tire, the positions in the tire width direction of the outer end edges in the tire width direction are equal to each other.
　ショルダー縦溝１４は、２ＮＤ縦溝１３よりタイヤ幅方向の外側に位置し、タイヤ周方向で隣り合う傾斜溝１２同士を接続する。ショルダー縦溝１４は、タイヤ赤道部ＣＬをタイヤ幅方向に挟む両側に各別に配置されている。ショルダー縦溝１４は、第１傾斜溝２１および第２傾斜溝２２それぞれにおいて、タイヤ周方向で隣り合う前記外側部分２１ｃ、２２ｃ同士を接続している。タイヤ幅方向で隣り合うショルダー縦溝１４と２ＮＤ縦溝１３とのタイヤ幅方向の間隔は、タイヤ周方向で隣り合う２ＮＤ縦溝１３のタイヤ幅方向のずれ量より大きい。 The shoulder vertical groove 14 is located outside the 2ND vertical groove 13 in the tire width direction, and connects the inclined grooves 12 adjacent to each other in the tire circumferential direction. The shoulder longitudinal grooves 14 are separately arranged on both sides sandwiching the tire equator CL in the tire width direction. The shoulder vertical groove 14 connects the outer portions 21c and 22c adjacent to each other in the tire circumferential direction in the first inclined groove 21 and the second inclined groove 22, respectively. An interval in the tire width direction between the shoulder vertical groove 14 and the 2ND vertical groove 13 adjacent in the tire width direction is larger than a shift amount in the tire width direction between the adjacent 2ND vertical grooves 13 in the tire circumferential direction.
　タイヤ周方向で隣り合うショルダー縦溝１４は、タイヤ幅方向の位置を互いに異ならせて配置されている。タイヤ周方向で隣り合うショルダー縦溝１４それぞれにおける、同一の傾斜溝１２に開口する各開口部は、タイヤ幅方向に離れている。すなわち、傾斜溝１２におけるショルダー縦溝１４の開口部は、その全域にわたって、傾斜溝１２を画成する内面のうち、タイヤ周方向を向く側面に対向している。ショルダー縦溝１４は、タイヤ周方向に千鳥状に配置されている。ショルダー縦溝１４の溝幅は、全長にわたって同等になっている。ショルダー縦溝１４の溝幅は、２ＮＤ縦溝１３の溝幅より狭くなっている。ショルダー縦溝１４の深さは、全長にわたって同等になっている。 シ ョ The shoulder longitudinal grooves 14 adjacent in the tire circumferential direction are arranged so that the positions in the tire width direction are different from each other. In each of the shoulder vertical grooves 14 adjacent to each other in the tire circumferential direction, each opening portion opening to the same inclined groove 12 is apart in the tire width direction. In other words, the opening of the shoulder vertical groove 14 in the inclined groove 12 faces the side surface facing the tire circumferential direction among the inner surfaces defining the inclined groove 12 over the entire area. The shoulder vertical grooves 14 are arranged in a staggered manner in the tire circumferential direction. The groove width of the shoulder vertical groove 14 is equal over the entire length. The groove width of the shoulder vertical groove 14 is smaller than the groove width of the 2ND vertical groove 13. The depth of the shoulder vertical groove 14 is equal over the entire length.
　ショルダー縦溝１４は、タイヤ周方向で隣り合う傾斜溝１２のうちの一方の傾斜溝１２に接続された第３縦溝３１と、第３縦溝３１に対して、タイヤ幅方向およびタイヤ周方向の各位置を異ならせて配置され、タイヤ周方向で隣り合う傾斜溝１２のうちの他方の傾斜溝１２に接続された第４縦溝３２と、第３縦溝３１と第４縦溝３２とを接続する第２段溝３３と、を備える。 The shoulder longitudinal groove 14 is connected to the third longitudinal groove 31 connected to one of the inclined grooves 12 adjacent to each other in the tire circumferential direction. And a fourth vertical groove 32 connected to the other inclined groove 12 of the inclined grooves 12 adjacent in the tire circumferential direction, a third vertical groove 31 and a fourth vertical groove 32. , And a second step groove 33 for connecting
　第３縦溝３１および第４縦溝３２の各長さは、互いに同等とされ、かつ第２段溝３３より長くなっている。例えば、第３縦溝３１および第４縦溝３２の各長さは、第２段溝３３の長さの２倍以上となっている。第２段溝３３のタイヤ周方向の大きさは、ショルダー縦溝１４のタイヤ周方向の大きさの０．０３倍以上０．３倍以下、好ましくは０．０５倍以上０．２倍以下となっている。第３縦溝３１および第４縦溝３２のタイヤ幅方向のずれ量は、ショルダー縦溝１４の溝幅以上となっている。第３縦溝３１および第４縦溝３２のタイヤ幅方向のずれ量は、ショルダー縦溝１４の溝幅の０．２倍以上０．８倍以下、好ましくは０．３倍以上０．７倍以下となっている。第２段溝３３のタイヤ幅方向に対する傾斜角度は、２５°以上６５°以下、好ましくは３０°以上６０°以下となっている。 各 Each length of the third vertical groove 31 and the fourth vertical groove 32 is equal to each other, and is longer than the second step groove 33. For example, each length of the third vertical groove 31 and the fourth vertical groove 32 is twice or more the length of the second step groove 33. The size of the second step groove 33 in the tire circumferential direction is 0.03 times or more and 0.3 times or less, preferably 0.05 times or more and 0.2 times or less of the shoulder circumferential groove 14 in the tire circumferential direction. Has become. The shift amount of the third vertical groove 31 and the fourth vertical groove 32 in the tire width direction is equal to or larger than the groove width of the shoulder vertical groove 14. The amount of deviation between the third longitudinal groove 31 and the fourth longitudinal groove 32 in the tire width direction is 0.2 times or more and 0.8 times or less, preferably 0.3 times or more and 0.7 times the groove width of the shoulder longitudinal grooves 14. It is as follows. The inclination angle of the second step groove 33 with respect to the tire width direction is from 25 ° to 65 °, preferably from 30 ° to 60 °.
　第３縦溝３１は、第４縦溝３２に対して前記回転方向Ｒの前側で、かつタイヤ幅方向の内側に位置している。
　タイヤ周方向に千鳥状に配置された複数のショルダー縦溝１４のうち、タイヤ幅方向の外側に位置する外側ショルダー縦溝３５は、タイヤ幅方向の内側に位置する内側ショルダー縦溝３６と比べて、溝幅が狭く、かつ深さが浅くなっている。内側ショルダー縦溝３６は、２ＮＤ縦溝１３と比べて、溝幅が狭く、かつ深さが同等になっている。内側ショルダー縦溝３６の第４縦溝３２におけるタイヤ幅方向の外端縁は、外側ショルダー縦溝３５の第３縦溝３１におけるタイヤ幅方向の内端縁よりタイヤ幅方向の内側に位置している。 The third vertical groove 31 is located on the front side in the rotation direction R with respect to the fourth vertical groove 32 and on the inner side in the tire width direction.
Of the plurality of shoulder vertical grooves 14 arranged in a staggered manner in the tire circumferential direction, the outer shoulder vertical grooves 35 located on the outer side in the tire width direction are compared with the inner shoulder vertical grooves 36 located on the inner side in the tire width direction. , The groove width is narrow and the depth is shallow. The inner shoulder vertical groove 36 has a smaller groove width and the same depth as the 2ND vertical groove 13. The outer edge in the tire width direction of the fourth vertical groove 32 of the inner shoulder vertical groove 36 is located inside the inner edge of the third vertical groove 31 of the outer shoulder vertical groove 35 in the tire width direction in the tire width direction. I have.
　外側ショルダー縦溝３５の溝幅は、２ＮＤ縦溝１３の溝幅の０．１倍以上０．６倍以下、好ましくは０．２倍以上０．５倍以下となっている。外側ショルダー縦溝３５は、第１傾斜溝２１および第２傾斜溝２２それぞれにおける前記内側部分２１ｄ、２２ｄと比べて、溝幅が狭く、かつ深さが浅くなっている。外側ショルダー縦溝３５の溝幅は、前記内側部分２１ｄ、２２ｄの溝幅の０．１倍以上０．８倍以下、好ましくは０．３倍以上０．６倍以下となっている。外側ショルダー縦溝３５は、タイヤ赤道部ＣＬから、タイヤ幅方向にトレッド幅Ｗの約１／４離れた位置よりタイヤ幅方向の外側に位置している。
　外側ショルダー縦溝３５は、タイヤ周方向に千鳥状に配置された複数の２ＮＤ縦溝１３のうち、タイヤ幅方向の外側に位置する２ＮＤ縦溝１３とタイヤ幅方向で隣り合い、内側ショルダー縦溝３６は、タイヤ周方向に千鳥状に配置された複数の２ＮＤ縦溝１３のうち、タイヤ幅方向の内側に位置する２ＮＤ縦溝１３とタイヤ幅方向で隣り合っている。 The groove width of the outer shoulder vertical groove 35 is 0.1 to 0.6 times, preferably 0.2 to 0.5 times the groove width of the 2ND vertical groove 13. The outer shoulder vertical groove 35 has a smaller groove width and a smaller depth than the inner portions 21d and 22d in the first inclined groove 21 and the second inclined groove 22, respectively. The groove width of the outer shoulder vertical groove 35 is 0.1 to 0.8 times, preferably 0.3 to 0.6 times the groove width of the inner portions 21d and 22d. The outer shoulder longitudinal groove 35 is located outside the tire equator CL in the tire width direction at a position about 1/4 of the tread width W in the tire width direction.
The outer shoulder vertical groove 35 is adjacent to the 2ND vertical groove 13 located outside in the tire width direction in the tire width direction among the plurality of 2ND vertical grooves 13 arranged in a staggered manner in the tire circumferential direction, and the inner shoulder vertical groove. Numeral 36 is adjacent to the 2ND vertical groove 13 located inside the tire width direction in the tire width direction among the plurality of 2ND vertical grooves 13 arranged in a staggered manner in the tire circumferential direction.
　ここで、傾斜溝１２を画成する内面のうち、前記回転方向Ｒの前側に位置する前側面は、タイヤ幅方向の内端部に２ＮＤ縦溝１３が開口した第１側面５１と、第１側面５１よりタイヤ幅方向の内側に位置し、タイヤ幅方向の外端部が、第１側面５１におけるタイヤ幅方向の内端部より前記回転方向Ｒの後側に位置する第２側面５２と、第１側面５１におけるタイヤ幅方向の内端縁と第２側面５２におけるタイヤ幅方向の外端縁とを連結し、タイヤ幅方向の外側を向く段差面５３と、を備える。 Here, of the inner surfaces defining the inclined groove 12, the front side surface located on the front side in the rotation direction R includes a first side surface 51 having a 2ND vertical groove 13 opened at an inner end in the tire width direction, and a first side surface 51. A second side surface 52 located on the inner side in the tire width direction from the side surface 51, and an outer end in the tire width direction located rearward of the rotation direction R from an inner end in the tire width direction on the first side surface 51; A step surface 53 that connects the inner edge of the first side surface 51 in the tire width direction and the outer edge of the second side surface 52 in the tire width direction and faces outward in the tire width direction is provided.
　第１側面５１のタイヤ幅方向に対する傾斜角度は、第２側面５２のタイヤ幅方向に対する傾斜角度より小さくなっている。２ＮＤ縦溝１３を画成する内面のうち、タイヤ幅方向の外側に位置する第３側面５４における第１側面５１との接続部分５５は、タイヤ幅方向の内側に向けて突の曲面状に形成されている。タイヤ径方向の外側から見た平面視で、この接続部分５５の曲率半径は、２ｍｍ以上２０ｍｍ以下、好ましくは３ｍｍ以上１０ｍｍ以下となっている。 The inclination angle of the first side surface 51 with respect to the tire width direction is smaller than the inclination angle of the second side surface 52 with respect to the tire width direction. Of the inner surface defining the 2ND vertical groove 13, a connection portion 55 of the third side surface 54 located on the outer side in the tire width direction with the first side surface 51 is formed in a curved shape protruding inward in the tire width direction. Have been. The radius of curvature of the connection portion 55 is 2 mm or more and 20 mm or less, and preferably 3 mm or more and 10 mm or less in a plan view as viewed from the outside in the tire radial direction.
　前記平面視で、第２側面５２と段差面５３とは、鋭角をなして連結されている。前記平面視で、第２側面５２と段差面５３とがなす角度は、２５°以上８０°以下、好ましくは３５°以上６０°以下となっている。なお、第２側面５２と段差面５３とは、突曲面部を介して連結されてもよい。段差面５３のタイヤ周方向の大きさは、１．０ｍｍ以上６．０ｍｍ以下、好ましくは１．５ｍｍ以上４．０ｍｍ以下となっている。段差面５３のタイヤ周方向の大きさは、傾斜溝１２の前記接続部分１２ａにおける溝幅の０．５倍以上１．５倍以下、好ましくは０．８倍以上１．３倍以下となっている。段差面５３は、タイヤ赤道部ＣＬから、タイヤ幅方向にトレッド幅Ｗの０．０５倍以上０．３５倍以下、好ましくは０．１倍以上０．３倍以下離れて位置している。段差面５３は、２ＮＤ縦溝１３を画成する内面のうち、タイヤ幅方向の内側に位置する第４側面５６における前記回転方向Ｒの後端部に、タイヤ周方向に段差なく連なっている。 で In the plan view, the second side surface 52 and the step surface 53 are connected at an acute angle. In the plan view, the angle formed by the second side surface 52 and the step surface 53 is not less than 25 ° and not more than 80 °, preferably not less than 35 ° and not more than 60 °. Note that the second side surface 52 and the step surface 53 may be connected via a projecting curved surface portion. The size of the step surface 53 in the tire circumferential direction is 1.0 mm or more and 6.0 mm or less, preferably 1.5 mm or more and 4.0 mm or less. The size of the step surface 53 in the tire circumferential direction is 0.5 times or more and 1.5 times or less, preferably 0.8 times or more and 1.3 times or less of the groove width of the inclined groove 12 at the connection portion 12a. I have. The step surface 53 is located away from the tire equator CL by 0.05 to 0.35 times, preferably 0.1 to 0.3 times the tread width W in the tire width direction. The step surface 53 is connected to the rear end of the rotation direction R on the fourth side surface 56 located on the inner side in the tire width direction in the inner surface defining the 2ND vertical groove 13 without any step in the tire circumferential direction.
　ここで、トレッド踏面部１１に、傾斜溝１２、２ＮＤ縦溝１３、およびショルダー縦溝１４により複数の陸部４１～４８が区画され、各陸部４１～４８に複数のサイプ３８ａ～３８ｈが形成されている。
　以下、具体的に説明する。 Here, a plurality of land portions 41 to 48 are defined in the tread tread portion 11 by the inclined grooves 12, 2ND vertical grooves 13, and shoulder vertical grooves 14, and a plurality of sipes 38a to 38h are formed in each of the land portions 41 to 48. Have been.
Hereinafter, a specific description will be given.
　タイヤ周方向で隣り合う第１傾斜溝２１同士の間に位置し、２ＮＤ縦溝１３、および第２傾斜溝２２の前記内側部分２２ｄに区画された第１センター陸部４１には、前記平面視で、第１傾斜溝２１にほぼ直交する方向に延びる複数の第１サイプ３８ａが形成されている。
　タイヤ周方向で隣り合う第２傾斜溝２２同士の間に位置し、２ＮＤ縦溝１３、および第１傾斜溝２１の前記内側部分２１ｄに区画された第２センター陸部４２には、前記平面視で、第２傾斜溝２２にほぼ直交する方向に延びる複数の第２サイプ３８ｂが形成されている。
　第１センター陸部４１および第２センター陸部４２それぞれにおけるタイヤ幅方向の外端部で、かつ前記回転方向Ｒの後端部に、第２側面５２と段差面５３とがなす角部が位置している。 The first center land portion 41 located between the first inclined grooves 21 adjacent to each other in the tire circumferential direction and partitioned into the 2ND vertical groove 13 and the inner portion 22d of the second inclined groove 22 has the planar view. Thus, a plurality of first sipes 38a extending in a direction substantially perpendicular to the first inclined groove 21 are formed.
The second center land portion 42, which is located between the second inclined grooves 22 adjacent in the tire circumferential direction and is divided into the 2ND vertical groove 13 and the inner portion 21 d of the first inclined groove 21, has the planar view. Thus, a plurality of second sipes 38b extending in a direction substantially orthogonal to the second inclined groove 22 are formed.
At the outer end in the tire width direction of each of the first center land portion 41 and the second center land portion 42 and at the rear end of the rotation direction R, a corner formed by the second side surface 52 and the step surface 53 is located. are doing.
　タイヤ周方向で隣り合う第１傾斜溝２１同士の間に位置し、２ＮＤ縦溝１３、および外側ショルダー縦溝３５に区画された第１中間陸部４３には、タイヤ幅方向の内側から外側に向かうに従い漸次、前記回転方向Ｒの前側に向けて延び、前記平面視で、第１サイプ３８ａよりタイヤ幅方向に対する傾斜角度が小さい複数の第３サイプ３８ｃが形成されている。
　タイヤ周方向で隣り合う第１傾斜溝２１同士の間に位置し、２ＮＤ縦溝１３、および内側ショルダー縦溝３６に区画された第２中間陸部４４には、前記平面視で、第１サイプ３８ａとほぼ平行に延びる複数の第４サイプ３８ｄが形成されている。 The first intermediate land portion 43 which is located between the first inclined grooves 21 adjacent to each other in the tire circumferential direction and is partitioned by the 2ND vertical groove 13 and the outer shoulder vertical groove 35 has an inner side and an outer side in the tire width direction. A plurality of third sipes 38c are formed that gradually extend toward the front side in the rotational direction R and have a smaller inclination angle with respect to the tire width direction than the first sipes 38a in the plan view.
The second intermediate land portion 44 located between the first inclined grooves 21 adjacent to each other in the tire circumferential direction and divided into the 2ND vertical groove 13 and the inner shoulder vertical groove 36 has a first sipe in a plan view. A plurality of fourth sipes 38d extending substantially parallel to 38a are formed.
　タイヤ周方向で隣り合う第２傾斜溝２２同士の間に位置し、２ＮＤ縦溝１３、および外側ショルダー縦溝３５に区画された第３中間陸部４５には、タイヤ幅方向の内側から外側に向かうに従い漸次、前記回転方向Ｒの前側に向けて延び、前記平面視で、第２サイプ３８ｂよりタイヤ幅方向に対する傾斜角度が小さい複数の第５サイプ３８ｅが形成されている。
　タイヤ周方向で隣り合う第２傾斜溝２２同士の間に位置し、２ＮＤ縦溝１３、および内側ショルダー縦溝３６に区画された第４中間陸部４６には、前記平面視で、第２サイプ３８ｂとほぼ平行に延びる複数の第６サイプ３８ｆが形成されている。 The third intermediate land portion 45 positioned between the second inclined grooves 22 adjacent to each other in the tire circumferential direction and partitioned into the 2ND vertical groove 13 and the outer shoulder vertical groove 35 has an inner side and an outer side in the tire width direction. A plurality of fifth sipes 38e are formed which gradually extend toward the front side in the rotational direction R and have a smaller inclination angle with respect to the tire width direction than the second sipes 38b in plan view.
A fourth intermediate land portion 46 located between the second inclined grooves 22 adjacent to each other in the tire circumferential direction and partitioned into the 2ND vertical groove 13 and the inner shoulder vertical groove 36 has a second sipe in a plan view. A plurality of sixth sipes 38f extending substantially parallel to 38b are formed.
　トレッド踏面部１１におけるタイヤ径方向の外端部において、タイヤ周方向で隣り合う第１傾斜溝２１同士の間に位置し、ショルダー縦溝１４に区画された第１ショルダー陸部４７には、第１傾斜溝２１に沿って延びる複数の第７サイプ３８ｇ、および第１細溝４７ａが形成されている。第１細溝４７ａは、第１ショルダー陸部４７のうち、外側ショルダー縦溝３５で区画された陸部では、第４縦溝３２に接続され、内側ショルダー縦溝３６で区画された陸部では、第２段溝３３に接続されている。第１細溝４７ａにおけるタイヤ幅方向の内端部に底上げ部４７ｂが形成されている。 At the outer end of the tread tread portion 11 in the tire radial direction, the first shoulder land portion 47 located between the first inclined grooves 21 adjacent to each other in the tire circumferential direction and partitioned by the shoulder vertical groove 14 includes A plurality of seventh sipes 38g extending along the one inclined groove 21 and first narrow grooves 47a are formed. The first narrow groove 47a is connected to the fourth vertical groove 32 in a land portion defined by the outer shoulder vertical groove 35 of the first shoulder land portion 47, and is formed in a land portion defined by the inner shoulder vertical groove 36 in the first shoulder land portion 47. , The second step groove 33. A bottom raising portion 47b is formed at an inner end of the first narrow groove 47a in the tire width direction.
　トレッド踏面部１１におけるタイヤ径方向の外端部において、タイヤ周方向で隣り合う第２傾斜溝２２同士の間に位置し、ショルダー縦溝１４に区画された第２ショルダー陸部４８には、第２傾斜溝２２に沿って延びる複数の第８サイプ３８ｈ、および第２細溝４８ａが形成されている。第２細溝４８ａは、第２ショルダー陸部４８のうち、外側ショルダー縦溝３５で区画された陸部では、第４縦溝３２に接続され、内側ショルダー縦溝３６で区画された陸部では、第２段溝３３に接続されている。第２細溝４８ａにおけるタイヤ幅方向の内端部に底上げ部４８ｂが形成されている。 At the outer end of the tread tread portion 11 in the tire radial direction, between the second inclined grooves 22 adjacent to each other in the tire circumferential direction, the second shoulder land portion 48 partitioned by the shoulder longitudinal groove 14 includes A plurality of eighth sipes 38h extending along the two inclined grooves 22 and second narrow grooves 48a are formed. The second narrow groove 48a is connected to the fourth vertical groove 32 at the land portion defined by the outer shoulder vertical groove 35 of the second shoulder land portion 48, and is formed at the land portion defined by the inner shoulder vertical groove 36. , The second step groove 33. A raised bottom portion 48b is formed at the inner end of the second narrow groove 48a in the tire width direction.
　以上説明したように、本実施形態に係るタイヤ１によれば、タイヤ周方向で隣り合う２ＮＤ縦溝１３が、タイヤ幅方向の位置を互いに異ならせて配置されているので、雪上走行時に、傾斜溝１２における２ＮＤ縦溝１３との接続部分１２ａ、および２ＮＤ縦溝１３に進入した雪を、傾斜溝１２を画成する内面において、２ＮＤ縦溝１３の開口部とタイヤ周方向に対向している部分に突き当てることで、タイヤ周方向に移動させずに留めておくことが可能になり、雪柱せん断力を生じさせることで、雪上グリップ性能を向上させることができる。 As described above, according to the tire 1 according to the present embodiment, the 2ND vertical grooves 13 adjacent to each other in the tire circumferential direction are arranged at positions different from each other in the tire width direction. The connection portion 12a of the groove 12 with the 2ND vertical groove 13 and the snow that has entered the 2ND vertical groove 13 face the opening of the 2ND vertical groove 13 in the tire circumferential direction on the inner surface defining the inclined groove 12. By hitting against the portion, the tire can be kept without moving in the circumferential direction of the tire, and a snow column shearing force is generated, whereby grip performance on snow can be improved.
　また、２ＮＤ縦溝１３が、タイヤ幅方向の位置が互いに異なる第１縦溝２５および第２縦溝２６を接続する第１段溝２７を備えるので、雪上走行時に、２ＮＤ縦溝１３に進入した雪を、第１段溝２７に係止することで、タイヤ周方向に抜け出させず、２ＮＤ縦溝１３に留めておくことが可能になり、雪上グリップ性能を確実に向上させることができる。
　また、ショルダー縦溝１４と比べて、タイヤ幅方向の内側に位置して、硬い雪柱が形成されやすい２ＮＤ縦溝１３が、第１段溝２７を備えることから、雪上グリップ性能を効果的に向上させることができる。 Further, since the 2ND vertical groove 13 includes the first step groove 27 connecting the first vertical groove 25 and the second vertical groove 26 having different positions in the tire width direction, the vehicle has entered the 2ND vertical groove 13 during traveling on snow. By locking the snow in the first step groove 27, the snow can be kept in the 2ND vertical groove 13 without slipping out in the tire circumferential direction, and the grip performance on snow can be reliably improved.
In addition, the 2ND vertical groove 13 which is located on the inner side in the tire width direction and in which a hard snow column is easily formed as compared with the shoulder vertical groove 14 includes the first step groove 27, so that the grip performance on snow is effectively improved. Can be improved.
　また、トレッド踏面部１１に、タイヤ径方向の外側から見た平面視でタイヤ赤道部ＣＬ付近で交差する、若しくは近接するＶ字状を呈する傾斜溝１２が形成されているので、排水性能、および雪上走行時の操縦安定性を両立させることができる。
　また、傾斜溝１２のうち、少なくとも２ＮＤ縦溝１３との接続部分１２ａの溝幅が、２ＮＤ縦溝１３の溝幅以上となっているので、雪上走行時に、傾斜溝１２の前記接続部分１２ａに多くの雪を進入させることが可能になり、雪上グリップ性能を確実に向上させることができる。 In addition, the tread tread portion 11 is formed with a V-shaped inclined groove 12 that intersects or is close to the tire equator portion CL in plan view when viewed from the outside in the tire radial direction, so that drainage performance and Steering stability when traveling on snow can be compatible.
In addition, since the groove width of at least the connection portion 12a with the 2ND vertical groove 13 of the inclined groove 12 is equal to or greater than the groove width of the 2ND vertical groove 13, when traveling on snow, the connection portion 12a of the inclined groove 12 A lot of snow can enter, and the grip performance on snow can be reliably improved.
　また、ショルダー縦溝１４が、タイヤ幅方向の位置が互いに異なる第３縦溝３１および第４縦溝３２を接続する第２段溝３３を備えるので、ショルダー縦溝１４が画成し、かつ２ＮＤ縦溝１３よりタイヤ幅方向の外側に位置する、第１中間陸部４３、第２中間陸部４４、第３中間陸部４５、第４中間陸部４６、第１ショルダー陸部４７、および第２ショルダー陸部４８に、タイヤ幅方向に尖るエッジ部分が形成されることとなり、雪上での旋回性能を向上させることができる。
　また、ショルダー縦溝１４が第２段溝３３を備えることから、雪上走行時に、ショルダー縦溝１４に進入した雪を、第２段溝３３に係止することで、タイヤ周方向に抜け出させず、ショルダー縦溝１４に留めておくことが可能になり、雪上グリップ性能を確実に向上させることができる。 Further, since the shoulder vertical groove 14 includes the second step groove 33 that connects the third vertical groove 31 and the fourth vertical groove 32 which are different from each other in the width direction of the tire, the shoulder vertical groove 14 is defined and 2ND The first intermediate land portion 43, the second intermediate land portion 44, the third intermediate land portion 45, the fourth intermediate land portion 46, the first shoulder land portion 47, and the first intermediate land portion 43 located outside the longitudinal groove 13 in the tire width direction. An edge portion that is sharp in the tire width direction is formed in the two shoulder land portion 48, and the turning performance on snow can be improved.
Further, since the shoulder vertical groove 14 includes the second step groove 33, the snow that has entered the shoulder vertical groove 14 during running on snow is locked in the second step groove 33 so that the snow does not escape in the tire circumferential direction. , Can be retained in the shoulder vertical groove 14, and the grip performance on snow can be reliably improved.
　また、２ＮＤ縦溝１３の溝幅が、ショルダー縦溝１４の溝幅より広いので、雪上走行時に、２ＮＤ縦溝１３に多くの雪を進入させることが可能になり、２ＮＤ縦溝１３が第１段溝２７を備えることと相俟って、大きな雪柱せん断力が生じることとなり、雪上グリップ性能を確実に向上させることができる。
　また、２ＮＤ縦溝１３の溝幅が、ショルダー縦溝１４の溝幅より広いことから、ウェット路面を走行している時に、傾斜溝１２の水が２ＮＤ縦溝１３の開口部に到達したときに、２ＮＤ縦溝１３内に導入されやすくなり、排水性能を向上させることができる。
　また、ショルダー縦溝１４の溝幅が、２ＮＤ縦溝１３の溝幅より狭いので、旋回走行時に、ショルダー縦溝１４を画成する内面のうち、タイヤ幅方向で対向する側面同士を当接若しくは近接させ、陸部剛性を高めることが可能になり、旋回性能を向上させることができる。 In addition, since the groove width of the 2ND vertical groove 13 is wider than the groove width of the shoulder vertical groove 14, it is possible to allow a large amount of snow to enter the 2ND vertical groove 13 during traveling on snow, and the 2ND vertical groove 13 becomes the first Along with the provision of the step groove 27, a large snow column shear force is generated, and the grip performance on snow can be reliably improved.
In addition, since the groove width of the 2ND vertical groove 13 is wider than the groove width of the shoulder vertical groove 14, when running on a wet road surface, when the water of the inclined groove 12 reaches the opening of the 2ND vertical groove 13, , It is easy to be introduced into the 2ND vertical groove 13, and the drainage performance can be improved.
In addition, since the groove width of the shoulder vertical groove 14 is smaller than the groove width of the 2ND vertical groove 13, during cornering, of the inner surfaces defining the shoulder vertical groove 14, the side surfaces facing each other in the tire width direction abut or touch each other. This makes it possible to increase the rigidity of the land portion by bringing them closer to each other, thereby improving the turning performance.
　また、傾斜溝１２が、タイヤ幅方向の外側からタイヤ赤道部ＣＬ側に向かうに従い漸次、前記回転方向Ｒの前側に向けて延びているので、ウェット路面を走行している時に、傾斜溝１２のうち、２ＮＤ縦溝１３にタイヤ幅方向の外側から連なる部分に位置する水が、タイヤ赤道部ＣＬ側に向けて流れ、２ＮＤ縦溝１３内に進入する。この際、第１縦溝２５が、第２縦溝２６に対して前記回転方向Ｒの前側で、かつタイヤ幅方向の内側に位置しているので、傾斜溝１２から２ＮＤ縦溝１３内に第２縦溝２６を通して進入した水は、第１段溝２７および第１縦溝２５をこの順に、タイヤ幅方向の外側に向けた逆向きの流れを生じさせずに通過する。これにより、２ＮＤ縦溝１３が、第１縦溝２５、第２縦溝２６および第１段溝２７を備えて、雪上グリップ性能が向上した反面、排水性能が低下するのを抑制することができる。 Further, since the inclined groove 12 gradually extends toward the front side in the rotation direction R from the outside in the tire width direction toward the tire equator CL side, when traveling on a wet road surface, the inclined groove 12 Of these, water located in a portion that continues to the 2ND vertical groove 13 from the outside in the tire width direction flows toward the tire equator CL side and enters the 2ND vertical groove 13. At this time, since the first vertical groove 25 is located on the front side in the rotation direction R with respect to the second vertical groove 26 and on the inner side in the tire width direction, the first vertical groove 25 is inserted into the 2ND vertical groove 13 from the inclined groove 12. The water that has entered through the two vertical grooves 26 passes through the first step grooves 27 and the first vertical grooves 25 in this order without generating a reverse flow toward the outside in the tire width direction. Thereby, the 2ND vertical groove 13 is provided with the first vertical groove 25, the second vertical groove 26, and the first step groove 27, and while the grip performance on snow is improved, it is possible to suppress a decrease in drainage performance. .
　また、第２縦溝２６に対して前記回転方向Ｒの前側に位置する第１縦溝２５が、第２縦溝２６に対してタイヤ幅方向の内側に位置していて、タイヤ幅方向の外側に位置していないので、この２ＮＤ縦溝１３が画成する、第１センター陸部４１、第２センター陸部４２、第１中間陸部４３、第２中間陸部４４、第３中間陸部４５、および第４中間陸部４６が摩耗しやすくなるのを抑制することができる。 In addition, the first vertical groove 25 located on the front side in the rotation direction R with respect to the second vertical groove 26 is located inside the second vertical groove 26 in the tire width direction, and is located outside the tire width direction. , The first center land portion 41, the second center land portion 42, the first intermediate land portion 43, the second intermediate land portion 44, the third intermediate land portion defined by the 2ND flute 13 45 and the fourth intermediate land portion 46 can be prevented from being easily worn.
　また、傾斜溝１２の前側面が、第１側面５１におけるタイヤ幅方向の内端縁と、この内端縁より前記回転方向Ｒの後側に位置する、第２側面５２におけるタイヤ幅方向の外端縁と、を連結し、かつタイヤ幅方向の外側を向く段差面５３を備えるので、ウェット路面を走行している時に、傾斜溝１２内でタイヤ幅方向の外側から２ＮＤ縦溝１３の開口部に到達した水が、段差面５３に衝突することで、２ＮＤ縦溝１３内に円滑に導入されることとなり、排水性能を向上させることができる。 Further, the front side surface of the inclined groove 12 has an inner edge in the tire width direction on the first side surface 51 and an outer edge in the tire width direction on the second side surface 52 located behind the inner edge in the rotation direction R. Since it is provided with a stepped surface 53 connecting the edge and the outside and facing the outside in the tire width direction, the opening of the 2ND vertical groove 13 from the outside in the tire width direction in the inclined groove 12 when running on a wet road surface. Reaches the step surface 53, the water is smoothly introduced into the 2ND vertical groove 13, and the drainage performance can be improved.
　また、前記平面視で、第２側面５２と段差面５３とが、鋭角をなして連結されているので、傾斜溝１２内でタイヤ幅方向の外側から２ＮＤ縦溝１３の開口部に到達した水を、２ＮＤ縦溝１３内に確実に導入することができる。
　また、２ＮＤ縦溝１３を画成する内面のうち、タイヤ幅方向の外側に位置する第３側面５４における第１側面５１との接続部分５５が、タイヤ幅方向の内側に向けて突の曲面状に形成されているので、傾斜溝１２内でタイヤ幅方向の外側から２ＮＤ縦溝１３の開口部に到達した水を、２ＮＤ縦溝１３内により一層確実に導入することができる。 Further, since the second side surface 52 and the step surface 53 are connected at an acute angle in the plan view, the water that reaches the opening of the 2ND vertical groove 13 from the outside in the tire width direction in the inclined groove 12 is formed. Can be reliably introduced into the 2ND vertical groove 13.
Also, of the inner surface defining the 2ND vertical groove 13, a connection portion 55 of the third side surface 54 located outside in the tire width direction with the first side surface 51 has a curved surface protruding inward in the tire width direction. Therefore, water reaching the opening of the 2ND vertical groove 13 from the outside in the tire width direction in the inclined groove 12 can be more reliably introduced into the 2ND vertical groove 13.
　なお、本発明の技術的範囲は前記実施の形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲において種々の変更を加えることが可能である。 The technical scope of the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention.
　前記実施形態では、傾斜溝１２を画成する内面のうち、前記回転方向Ｒの前側に位置する前側面が、第１側面５１、第２側面５２および段差面５３を備える構成を示したが、前側面が全長にわたって平滑に延びる構成を採用してもよい。
　また、２ＮＤ縦溝１３の第３側面５４における第１側面５１との接続部分５５は、タイヤ周方向に真直ぐ延びてもよい。 In the above-described embodiment, of the inner surface defining the inclined groove 12, the front side surface located on the front side in the rotation direction R includes the first side surface 51, the second side surface 52, and the step surface 53. A configuration in which the front side surface extends smoothly over the entire length may be employed.
In addition, the connection portion 55 of the 2ND vertical groove 13 with the first side surface 51 on the third side surface 54 may extend straight in the tire circumferential direction.
　また、ショルダー縦溝１４は、タイヤ周方向に真直ぐ延びてもよい。
　また、傾斜溝１２は、タイヤ赤道部ＣＬと交差せず、タイヤ赤道部ＣＬから離れてもよく、また、第１傾斜溝２１と第２傾斜溝２２とを交差させなくてもよい。 Further, the shoulder vertical groove 14 may extend straight in the tire circumferential direction.
The inclined groove 12 may not cross the tire equator CL and may be separated from the tire equator CL, and the first inclined groove 21 and the second inclined groove 22 do not need to intersect.
　この発明では、タイヤ周方向で隣り合う２ＮＤ縦溝が、タイヤ幅方向の位置を互いに異ならせて配置されているので、雪上走行時に、傾斜溝における２ＮＤ縦溝との接続部分、および２ＮＤ縦溝に進入した雪を、傾斜溝を画成する内面において、２ＮＤ縦溝の開口部とタイヤ周方向に対向している部分に突き当てることで、タイヤ周方向に移動させずに留めておくことが可能になり、雪柱せん断力を生じさせることで、雪上グリップ性能を向上させることができる。
　また、２ＮＤ縦溝が、タイヤ幅方向の位置が互いに異なる第１縦溝および第２縦溝を接続する第１段溝を備えるので、雪上走行時に、２ＮＤ縦溝に進入した雪を、第１段溝に係止することで、タイヤ周方向に抜け出させず、２ＮＤ縦溝に留めておくことが可能になり、雪上グリップ性能を確実に向上させることができる。
　また、ショルダー縦溝と比べて、タイヤ幅方向の内側に位置して、硬い雪柱が形成されやすい２ＮＤ縦溝が、第１段溝を備えることから、雪上グリップ性能を効果的に向上させることができる。
　また、トレッド踏面部に、タイヤ径方向の外側から見た平面視でタイヤ赤道部付近で交差する、若しくは近接するＶ字状を呈する傾斜溝が形成されているので、排水性能、および雪上走行時の操縦安定性を両立させることができる。 According to the present invention, the 2ND vertical grooves adjacent in the tire circumferential direction are arranged so that the positions in the tire width direction are different from each other. Therefore, when traveling on snow, the connecting portion of the inclined grooves with the 2ND vertical grooves, and the 2ND vertical grooves The snow that has entered the tire can be kept in the tire circumferential direction by abutting it against the portion of the inner surface that defines the inclined groove that faces the opening of the 2ND vertical groove in the tire circumferential direction. It is possible to improve the grip performance on snow by generating a snow column shear force.
In addition, since the 2ND vertical groove includes the first step groove connecting the first vertical groove and the second vertical groove which are different from each other in the tire width direction, the snow entering the 2ND vertical groove during traveling on snow can be removed by the first vertical groove. By locking in the step groove, the tire can be kept in the 2ND vertical groove without slipping out in the tire circumferential direction, and the grip performance on snow can be surely improved.
In addition, compared to the shoulder vertical groove, the 2ND vertical groove which is located on the inner side in the tire width direction and in which a hard snow column is easily formed has the first step groove, so that the grip performance on snow is effectively improved. Can be.
In addition, since the tread portion has a V-shaped inclined groove that intersects or approaches the tire equator portion in plan view when viewed from the outside in the tire radial direction, the drainage performance and the running performance on snow The steering stability can be compatible.
　ここで、前記傾斜溝のうち、少なくとも前記２ＮＤ縦溝との接続部分の溝幅は、前記２ＮＤ縦溝の溝幅以上となってもよい。 Here, among the inclined grooves, at least a groove width of a connection portion with the 2ND vertical groove may be equal to or larger than a groove width of the 2ND vertical groove.
　この場合、傾斜溝のうち、少なくとも２ＮＤ縦溝との接続部分の溝幅が、２ＮＤ縦溝の溝幅以上となっているので、雪上走行時に、傾斜溝の前記接続部分に多くの雪を進入させることが可能になり、雪上グリップ性能を確実に向上させることができる。 In this case, among the inclined grooves, at least the groove width of the connection portion with the 2ND vertical groove is equal to or greater than the groove width of the 2ND vertical groove, so that a large amount of snow enters the connection portion of the inclined groove during traveling on snow. It is possible to reliably improve the grip performance on snow.
　また、前記ショルダー縦溝は、タイヤ周方向で隣り合う前記傾斜溝のうちの一方の前記傾斜溝に接続された第３縦溝と、前記第３縦溝に対して、タイヤ幅方向およびタイヤ周方向の各位置を異ならせて配置され、タイヤ周方向で隣り合う前記傾斜溝のうちの他方の前記傾斜溝に接続された第４縦溝と、前記第３縦溝と前記第４縦溝とを接続する第２段溝と、を備えてもよい。 In addition, the shoulder longitudinal groove has a third longitudinal groove connected to one of the inclined grooves adjacent to each other in the tire circumferential direction, and a tire longitudinal direction and a tire circumferential direction with respect to the third longitudinal groove. A fourth vertical groove connected to the other of the inclined grooves adjacent to each other in the tire circumferential direction, and a third vertical groove and the fourth vertical groove. And a second-stage groove for connecting the two.
　この場合、ショルダー縦溝が、タイヤ幅方向の位置が互いに異なる第３縦溝および第４縦溝を接続する第２段溝を備えるので、ショルダー縦溝が画成し、かつ２ＮＤ縦溝よりタイヤ幅方向の外側に位置する陸部に、タイヤ幅方向に尖るエッジ部分が形成されることとなり、雪上での旋回性能を向上させることができる。
　また、ショルダー縦溝が第２段溝を備えることから、雪上走行時に、ショルダー縦溝に進入した雪を、第２段溝に係止することで、タイヤ周方向に抜け出させず、ショルダー縦溝に留めておくことが可能になり、雪上グリップ性能を確実に向上させることができる。 In this case, since the shoulder vertical groove has a second step groove connecting the third vertical groove and the fourth vertical groove which are different from each other in the position in the tire width direction, the shoulder vertical groove is defined, and the tire is more than the 2ND vertical groove. An edge portion that is sharp in the tire width direction is formed on the land portion located outside in the width direction, and the turning performance on snow can be improved.
In addition, since the shoulder vertical groove has the second step groove, when the vehicle travels on snow, the snow that has entered the shoulder vertical groove is locked in the second step groove so that the snow does not escape in the tire circumferential direction. , It is possible to reliably improve the grip performance on snow.
　また、前記２ＮＤ縦溝の溝幅は、前記ショルダー縦溝の溝幅より広くてもよい。 The width of the 2ND vertical groove may be wider than the width of the shoulder vertical groove.
　この場合、２ＮＤ縦溝の溝幅が、ショルダー縦溝の溝幅より広いので、雪上走行時に、２ＮＤ縦溝に多くの雪を進入させることが可能になり、２ＮＤ縦溝が第１段溝を備えることと相俟って、大きな雪柱せん断力が生じることとなり、雪上グリップ性能を確実に向上させることができる。
　また、２ＮＤ縦溝の溝幅が、ショルダー縦溝の溝幅より広いことから、ウェット路面を走行している時に、傾斜溝の水が２ＮＤ縦溝の開口部に到達したときに、２ＮＤ縦溝内に導入されやすくなり、排水性能を向上させることができる。
　また、ショルダー縦溝の溝幅が、２ＮＤ縦溝の溝幅より狭いので、旋回走行時に、ショルダー縦溝を画成する内面のうち、タイヤ幅方向で対向する側面同士を当接若しくは近接させ、陸部剛性を高めることが可能になり、旋回性能を向上させることができる。 In this case, since the groove width of the 2ND vertical groove is wider than the groove width of the shoulder vertical groove, it is possible to allow a large amount of snow to enter the 2ND vertical groove when traveling on snow, and the 2ND vertical groove replaces the first step groove. In combination with the provision, a large snow column shear force is generated, and the grip performance on snow can be reliably improved.
Further, since the width of the 2ND vertical groove is wider than the width of the shoulder vertical groove, when the water of the inclined groove reaches the opening of the 2ND vertical groove while traveling on a wet road surface, the 2ND vertical groove is not used. It can be easily introduced into the inside, and the drainage performance can be improved.
Further, since the groove width of the shoulder vertical groove is smaller than the groove width of the 2ND vertical groove, during turning, of the inner surfaces defining the shoulder vertical groove, the side surfaces facing each other in the tire width direction abut or approach each other, Land portion rigidity can be increased, and turning performance can be improved.
　また、車両を前進させるタイヤの回転方向を示す明示部を備え、前記傾斜溝は、タイヤ幅方向の外側からタイヤ赤道部側に向かうに従い漸次、前記回転方向の前側に向けて延び、前記第１縦溝は、前記第２縦溝に対して前記回転方向の前側で、かつタイヤ幅方向の内側に位置してもよい。 The tire further includes an indicating portion that indicates a rotation direction of the tire that advances the vehicle. The inclined groove gradually extends toward the front side in the rotation direction from the outside in the tire width direction toward the tire equator portion, and The vertical groove may be located on the front side in the rotation direction with respect to the second vertical groove, and on the inner side in the tire width direction.
　この場合、傾斜溝が、タイヤ幅方向の外側からタイヤ赤道部側に向かうに従い漸次、前記回転方向の前側に向けて延びているので、ウェット路面を走行している時に、傾斜溝のうち、２ＮＤ縦溝にタイヤ幅方向の外側から連なる部分に位置する水が、タイヤ赤道部側に向けて流れ、２ＮＤ縦溝内に進入する。この際、第１縦溝が、第２縦溝に対して前記回転方向の前側で、かつタイヤ幅方向の内側に位置しているので、傾斜溝から２ＮＤ縦溝内に第２縦溝を通して進入した水は、第１段溝および第１縦溝をこの順に、タイヤ幅方向の外側に向けた逆向きの流れを生じさせずに通過する。これにより、２ＮＤ縦溝が、第１縦溝、第２縦溝および第１段溝を備えて、雪上グリップ性能が向上した反面、排水性能が低下するのを抑制することができる。
　また、第２縦溝に対して前記回転方向の前側に位置する第１縦溝が、第２縦溝に対してタイヤ幅方向の内側に位置していて、タイヤ幅方向の外側に位置していないので、この２ＮＤ縦溝が画成する陸部が摩耗しやすくなるのを抑制することができる。 In this case, since the inclined grooves gradually extend toward the front side in the rotation direction from the outer side in the tire width direction toward the tire equator side, when traveling on a wet road surface, 2ND of the inclined grooves Water located in a portion connected to the longitudinal groove from the outside in the tire width direction flows toward the tire equator, and enters the 2ND longitudinal groove. At this time, since the first vertical groove is located on the front side in the rotation direction and inside the tire width direction with respect to the second vertical groove, the first vertical groove enters the 2ND vertical groove from the inclined groove through the second vertical groove. The water passes through the first step groove and the first vertical groove in this order without generating a reverse flow toward the outside in the tire width direction. Accordingly, the 2ND vertical groove includes the first vertical groove, the second vertical groove, and the first step groove, so that the grip performance on snow is improved, but it is possible to suppress a decrease in drainage performance.
Further, the first longitudinal groove located on the front side in the rotation direction with respect to the second longitudinal groove is located inside the second longitudinal groove in the tire width direction, and is located outside the tire width direction. Since there is no land portion, the land portion defined by the 2ND flute can be suppressed from being easily worn.
　その他、本発明の趣旨を逸脱しない範囲で、前記した実施の形態における構成要素を周知の構成要素に置き換えることは適宜可能であり、また、前記した変形例を適宜組み合わせてもよい。 In addition, it is possible to appropriately replace the components in the above-described embodiments with well-known components without departing from the spirit of the present invention, and the above-described modifications may be appropriately combined.
本発明のタイヤを当該分野に適用することにより、雪上グリップ性能を向上させることができる。 By applying the tire of the present invention to the field, the grip performance on snow can be improved.
　１　タイヤ
　１１　トレッド踏面部
　１２　傾斜溝
　１２ａ　傾斜溝の接続部分
　１３　２ＮＤ縦溝
　１４　ショルダー縦溝
　２５　第１縦溝
　２６　第２縦溝
　２７　第１段溝
　３１　第３縦溝
　３２　第４縦溝
　３３　第２段溝
　ＣＬ　タイヤ赤道部
　Ｒ　回転方向 Reference Signs List 1 tire 11 tread tread portion 12 inclined groove 12a inclined groove connection portion 13 2ND vertical groove 14 shoulder vertical groove 25 first vertical groove 26 second vertical groove 27 first step groove 31 third vertical groove 32 fourth vertical groove 33th Two-step groove CL Tire equator R Rotation direction

Claims (5)

  1. 　トレッド踏面部を備え、
    前記トレッド踏面部に、
    　タイヤ径方向の外側から見た平面視でタイヤ赤道部付近で交差する、若しくは近接するＶ字状を呈するとともに、タイヤ周方向に複数配置された傾斜溝と、
    　タイヤ周方向で隣り合う前記傾斜溝同士を接続する２ＮＤ縦溝と、
    　前記２ＮＤ縦溝よりタイヤ幅方向の外側に位置し、タイヤ周方向で隣り合う前記傾斜溝同士を接続するショルダー縦溝と、が、形成され、
    　タイヤ周方向で隣り合う前記２ＮＤ縦溝は、タイヤ幅方向の位置を互いに異ならせて配置され、
    　前記２ＮＤ縦溝は、
    　タイヤ周方向で隣り合う前記傾斜溝のうちの一方の前記傾斜溝に接続された第１縦溝と、
    　前記第１縦溝に対して、タイヤ幅方向およびタイヤ周方向の各位置を異ならせて配置され、タイヤ周方向で隣り合う前記傾斜溝のうちの他方の前記傾斜溝に接続された第２縦溝と、
    　前記第１縦溝と前記第２縦溝とを接続する第１段溝と、を備える、タイヤ。     With tread treads,
    In the tread tread,
    Crosses in the vicinity of the tire equator in a plan view seen from the outside in the tire radial direction, or presents a V-shape close to, and a plurality of inclined grooves arranged in the tire circumferential direction,
    A 2ND vertical groove connecting the inclined grooves adjacent to each other in the tire circumferential direction,
    A shoulder longitudinal groove which is located outside the 2ND longitudinal groove in the tire width direction and connects the inclined grooves adjacent to each other in the tire circumferential direction,
    The 2ND vertical grooves adjacent in the tire circumferential direction are arranged so that the positions in the tire width direction are different from each other,
    The 2ND flute,
    A first vertical groove connected to one of the inclined grooves adjacent to each other in the tire circumferential direction,
    The second longitudinal groove is disposed so as to have different positions in the tire width direction and the tire circumferential direction with respect to the first longitudinal groove, and is connected to the other of the inclined grooves adjacent in the tire circumferential direction. Grooves and
    A tire comprising: a first step groove connecting the first vertical groove and the second vertical groove.
  2. 　前記傾斜溝のうち、少なくとも前記２ＮＤ縦溝との接続部分の溝幅は、前記２ＮＤ縦溝の溝幅以上となっている、請求項１に記載のタイヤ。 2. The tire according to claim 1, wherein at least a groove width of a connecting portion between the inclined groove and the 2ND vertical groove is equal to or larger than a groove width of the 2ND vertical groove.
  3. 　前記ショルダー縦溝は、
    　タイヤ周方向で隣り合う前記傾斜溝のうちの一方の前記傾斜溝に接続された第３縦溝と、
    　前記第３縦溝に対して、タイヤ幅方向およびタイヤ周方向の各位置を異ならせて配置され、タイヤ周方向で隣り合う前記傾斜溝のうちの他方の前記傾斜溝に接続された第４縦溝と、
    　前記第３縦溝と前記第４縦溝とを接続する第２段溝と、を備える、請求項１または２に記載のタイヤ。     The shoulder longitudinal groove,
    A third vertical groove connected to one of the inclined grooves adjacent to each other in the tire circumferential direction,
    The fourth longitudinal groove is arranged so that each position in the tire width direction and the tire circumferential direction is different from the third longitudinal groove, and is connected to the other of the inclined grooves adjacent in the tire circumferential direction. Grooves and
    The tire according to claim 1 or 2, further comprising a second step groove connecting the third vertical groove and the fourth vertical groove.
  4. 　前記２ＮＤ縦溝の溝幅は、前記ショルダー縦溝の溝幅より広い、請求項１から３のいずれか１項に記載のタイヤ。 4. The tire according to claim 1, wherein a groove width of the 2ND vertical groove is wider than a groove width of the shoulder vertical groove. 5.
  5. 　車両を前進させるタイヤの回転方向を示す明示部を備え、
    　前記傾斜溝は、タイヤ幅方向の外側からタイヤ赤道部側に向かうに従い漸次、前記回転方向の前側に向けて延び、
    　前記第１縦溝は、前記第２縦溝に対して前記回転方向の前側で、かつタイヤ幅方向の内側に位置している、請求項１から４のいずれか１項に記載のタイヤ。     It has an explicit part that indicates the rotation direction of the tire that advances the vehicle,
    The inclined groove gradually extends toward the front side in the rotation direction as it goes from the outside in the tire width direction to the tire equator side,
    The tire according to any one of claims 1 to 4, wherein the first vertical groove is located on the front side in the rotation direction with respect to the second vertical groove, and on the inner side in the tire width direction.
PCT/JP2019/025623 2018-07-04 2019-06-27 Tire WO2020008996A1 (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09188109A (en) * 1996-01-11 1997-07-22 Bridgestone Corp Pneumatic tire for heavy load
JP2003080907A (en) * 2001-09-11 2003-03-19 Bridgestone Corp Pneumatic tire
JP2013184666A (en) * 2012-03-09 2013-09-19 Yokohama Rubber Co Ltd:The Pneumatic tire
JP2015123937A (en) * 2013-12-27 2015-07-06 住友ゴム工業株式会社 Winter tire
US20170157990A1 (en) * 2015-12-08 2017-06-08 The Goodyear Tire & Rubber Company Pneumatic tire
WO2017092898A1 (en) * 2015-12-04 2017-06-08 Continental Reifen Deutschland Gmbh Pneumatic vehicle tyres
JP2018177094A (en) * 2017-04-18 2018-11-15 住友ゴム工業株式会社 Tire

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09188109A (en) * 1996-01-11 1997-07-22 Bridgestone Corp Pneumatic tire for heavy load
JP2003080907A (en) * 2001-09-11 2003-03-19 Bridgestone Corp Pneumatic tire
JP2013184666A (en) * 2012-03-09 2013-09-19 Yokohama Rubber Co Ltd:The Pneumatic tire
JP2015123937A (en) * 2013-12-27 2015-07-06 住友ゴム工業株式会社 Winter tire
WO2017092898A1 (en) * 2015-12-04 2017-06-08 Continental Reifen Deutschland Gmbh Pneumatic vehicle tyres
US20170157990A1 (en) * 2015-12-08 2017-06-08 The Goodyear Tire & Rubber Company Pneumatic tire
JP2018177094A (en) * 2017-04-18 2018-11-15 住友ゴム工業株式会社 Tire

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