WO2016035660A1 - 空気入りタイヤ - Google Patents
空気入りタイヤ Download PDFInfo
- Publication number
- WO2016035660A1 WO2016035660A1 PCT/JP2015/074164 JP2015074164W WO2016035660A1 WO 2016035660 A1 WO2016035660 A1 WO 2016035660A1 JP 2015074164 W JP2015074164 W JP 2015074164W WO 2016035660 A1 WO2016035660 A1 WO 2016035660A1
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- Prior art keywords
- groove
- auxiliary
- circumferential
- grooves
- tire
- Prior art date
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- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
- B60C11/1204—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/0304—Asymmetric patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
- B60C11/1236—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern
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- 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
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0339—Grooves
- B60C2011/0341—Circumferential grooves
- B60C2011/0346—Circumferential grooves with zigzag shape
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- 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
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0339—Grooves
- B60C2011/0341—Circumferential grooves
- B60C2011/0348—Narrow grooves, i.e. having a width of less than 4 mm
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- 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
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0339—Grooves
- B60C2011/0381—Blind or isolated grooves
- B60C2011/0383—Blind or isolated grooves at the centre of the tread
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- 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
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0386—Continuous ribs
- B60C2011/0388—Continuous ribs provided at the equatorial plane
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
- B60C2011/129—Sipe density, i.e. the distance between the sipes within the pattern
Definitions
- the present invention relates to a pneumatic tire.
- pneumatic tires designed with a tread pattern of tires for the purpose of improving steering stability and noise performance and pneumatic designed with a tread pattern of tires for improving traction performance on ice and snow while suppressing uneven wear Tires are known.
- the pneumatic tire described in Patent Document 1 is intended to reduce heel and toe wear generated in blocks and lugs in a tread pattern in which blocks or lugs are arranged at least on the shoulder portion of the tread surface.
- This pneumatic tire has a tread pattern in which blocks or lugs are arranged at least on the shoulder portion of the tread surface, and is a pneumatic radial tire for a non-driven wheel in which a rotation direction is specified.
- the sipes extending in the tire width direction are arranged in the tire circumferential direction, the lengths of the tire width direction components of the plurality of sipes are made different, and the sipe having the longest tire width direction component is arranged on the rear side in the tire rotation direction.
- the short sipes are sequentially arranged in front of the tire rotation direction.
- the pneumatic tire described in Patent Document 1 described above can disperse the frictional force that increases on the rear end side (kick-up side) during braking, thereby suppressing uneven wear on the kick-up side, but on dry road surfaces and snowy road surfaces. Running performance is insufficient.
- the present invention has been made in view of the above, and an object thereof is to provide a pneumatic tire capable of achieving both wear resistance on a dry road surface and running performance on a wet road surface and a snowy road surface. To do.
- a pneumatic tire according to an aspect of the present invention is provided with an inner circumferential groove and an outer side provided in a tread portion and extending in the tire circumferential direction.
- a circumferential groove, a circumferential inter-groove land portion defined by the inner circumferential groove and the outer circumferential groove, and a plurality of the circumferential inter-groove land portions are provided in the tire circumferential direction,
- a plurality of first auxiliary grooves that communicate with the circumferential grooves and terminate in the circumferential groove land, and a plurality of tires in the circumferential direction of the tire, communicate with the outer circumferential grooves, and land between the circumferential grooves.
- a second auxiliary groove that terminates in the section, the first auxiliary groove and the second auxiliary groove are alternately arranged without intersecting, and at least one of the first auxiliary grooves is provided between the first auxiliary grooves.
- One, and a second auxiliary groove between narrow grooves provided number greater than the first auxiliary groove between narrow grooves.
- the length of the second auxiliary groove is different depending on the position between the second auxiliary grooves, and the longer groove is grounded before the shorter groove when traveling in the forward direction. It is preferable to do.
- the length of the longer second auxiliary groove narrow groove is a, and the length of the shorter second auxiliary groove is smaller.
- the groove length is b, it is preferable that 0.7a ⁇ b ⁇ 0.9a.
- the narrow groove between the second auxiliary grooves has a curved shape.
- the shape of the first auxiliary inter-groove narrow groove is a curved shape, and the curved shape of the first auxiliary inter-groove narrow groove and the curved shape of the second auxiliary inter-groove narrow groove are convex directions of one curved shape. Is arranged so that the concave direction of the other curved shape faces the tire rotation direction, the distance in the tire circumferential direction at both ends in the tire width direction is the distance in the tire circumferential direction at the center in the tire width direction Shorter than that.
- the circumferential inter-groove land portion preferably satisfies W1 ⁇ W2 when the length of the formed first auxiliary groove is W1 and the length of the formed second auxiliary groove is W2. .
- the first auxiliary groove is preferably arranged on the outer side in the tire width direction, and the second auxiliary groove is preferably arranged on the inner side in the tire width direction.
- the circumferential inter-groove land is preferably disposed on the tire equator plane.
- first auxiliary groove narrow groove and the second auxiliary groove narrow groove have a groove width of 0.4 mm or more and 1.2 mm or less.
- the pneumatic tire according to the present invention can achieve both wear resistance performance on a dry road surface and traveling performance on a wet road surface and a snowy road surface.
- FIG. 1 is a plan view of a pneumatic tire according to an embodiment of the present invention.
- FIG. 2 is a partially enlarged plan view of the pneumatic tire according to the embodiment of the present invention.
- FIG. 3 is a partially enlarged plan view of the pneumatic tire according to the embodiment of the present invention.
- FIG. 4A is a diagram for explaining the relationship between the direction of the shape of the fifth fine groove and the direction of the shape of the sixth fine groove.
- FIG. 4B is a diagram for explaining the relationship between the direction of the shape of the fifth fine groove and the direction of the shape of the sixth fine groove.
- FIG. 5 is a diagram schematically showing a modification of the pneumatic tire in FIG. 1.
- FIG. 6 is a diagram schematically illustrating a modified example of the pneumatic tire according to the embodiment of the present invention.
- FIG. 7 is a view schematically showing a modification of the pneumatic tire according to the embodiment of the present invention.
- FIG. 1 is a plan view of a pneumatic tire according to the present embodiment.
- the tire circumferential direction is a circumferential direction having a rotation axis (not shown) as a central axis.
- the tire width direction means a direction parallel to the rotation axis
- the inner side in the tire width direction means the side toward the tire equator plane (tire equator line) CL in the tire width direction
- the outer side in the tire width direction means the tire width.
- the tire equatorial plane CL is a plane that is orthogonal to the rotational axis of the pneumatic tire 1 and passes through the center of the tire width of the pneumatic tire 1.
- the tire equator line is a line along the circumferential direction of the pneumatic tire 1 on the tire equator plane CL.
- CL the same sign “CL” as that of the tire equator plane is attached to the tire equator line.
- the pneumatic tire 1 of the present embodiment has a tread portion 2 as shown in FIG.
- the tread portion 2 is made of a rubber material, exposed at the outermost side in the tire radial direction of the pneumatic tire 1, and the surface thereof becomes the contour of the pneumatic tire 1 as a tread surface 2 a.
- the inside / outside direction of the vehicle is designated by indicating the direction inside / outside the vehicle when the vehicle is mounted by an index provided on the sidewall.
- designated of a vehicle inner side and a vehicle outer side is not restricted to the case where it mounts
- the direction of the rim with respect to the inside and outside of the vehicle is determined in the tire width direction. For this reason, when the pneumatic tire 1 is assembled with a rim, the orientation with respect to the vehicle inner side and the vehicle outer side is designated in the tire width direction.
- the tread portion 2 is provided with a plurality of (four in this embodiment) circumferential grooves 3 extending along the tire circumferential direction in the tread surface 2a.
- two circumferential grooves 3 are provided with the tire equatorial plane CL interposed therebetween.
- one of the two circumferential grooves 3 outside the vehicle with the tire equatorial plane CL in between is the first circumferential groove 3A, and one inside the vehicle is the second circumferential groove ( (Inner circumferential groove) 3B.
- one on the outer side of the vehicle is a third circumferential groove (outer circumferential groove) 3C, and one on the inner side of the vehicle is the first.
- the third circumferential groove 3C is formed with a narrower groove width (groove opening width in the tire width direction) than the other circumferential grooves 3 (3A, 3B, 3D).
- a circumferential narrow groove 3S is provided between the first circumferential groove 3A and the second circumferential groove 3B.
- the circumferential groove 3 is, for example, one having a groove width of 5 mm or more and 15 mm or less and a groove depth of 5 mm or more and 15 mm or less (a dimension from the opening position of the tread surface 2a to the groove bottom).
- the first circumferential groove 3A, the second circumferential groove 3B, the third circumferential groove 3C, and the fourth circumferential groove 3D may be referred to as main grooves.
- the tread portion 2 includes a plurality of land portions 4 (five in the present embodiment) divided in the tire width direction by circumferential grooves 3 on the tread surface 2a.
- the land portion 4 between the first circumferential groove 3A and the second circumferential groove 3B is defined as a first land portion 4A.
- the land portion 4 between the third circumferential groove 3C and the fourth circumferential groove 3D is referred to as a second land portion 4B.
- the land portion 4 on the vehicle outer side (tire width direction outer side) of the first land portion 4A is referred to as a third land portion 4C.
- the land portion 4 between the second circumferential groove 3B and the third circumferential groove 3C and on the tire equator plane CL is referred to as a fourth land portion (circumferential groove land portion) 4D.
- the land portion 4 on the vehicle inner side (tire width direction outer side) of the fourth circumferential groove 3D is referred to as a fifth land portion 4E.
- an auxiliary groove 5 and a narrow groove 6 are formed on the tread surface 2a so as to intersect with the tire circumferential direction and are provided side by side in the tire circumferential direction.
- the narrow groove 6 has a groove width of 0.4 mm or more and 1.2 mm or less and a groove depth of the circumferential groove 3 or less, for example.
- the auxiliary groove 5 is, for example, a groove having a groove width of 0.5 mm or more and a circumferential groove 3 or less and a groove depth of the circumferential groove 3 or less.
- the auxiliary groove 5 has a first auxiliary groove 5A, a second auxiliary groove 5B, and a third auxiliary groove 5C.
- the first auxiliary groove 5A communicates with the first circumferential groove 3A, penetrates the second circumferential groove 3B and the circumferential narrow groove 3S, and is formed to terminate at the fourth land portion 4D.
- the second auxiliary groove 5B passes through the third circumferential groove 3C and the fourth circumferential groove 3D, and passes from the fifth land portion 4E on the shoulder inside the vehicle to the fourth land portion 4D at the center via the second land portion 4B. It is provided at the very end. That is, one end of the second auxiliary groove 5B is arranged at the design end D which is the fifth land portion 4E on the shoulder inside the vehicle and inside the vehicle at the ground contact end T, and the other end at the fourth land portion 4D at the center. It is terminated.
- the first auxiliary groove 5A and the second auxiliary groove 5B are formed so that the groove width gradually increases in a direction away from the fourth land portion 4D of the center. Thereby, since drainage improves, the improvement effect of the braking performance on a wet road surface can be assisted.
- the ground contact edge T means both outermost ends in the tire width direction of the ground contact region, and in FIG. 1, the ground contact edge T is shown continuously in the tire circumferential direction.
- the regular rim is “standard rim” defined by JATMA, “Design Rim” defined by TRA, or “Measuring Rim” defined by ETRTO.
- the normal internal pressure is “maximum air pressure” defined by JATMA, the maximum value described in “TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES” defined by TRA, or “INFLATION PRESSURES” defined by ETRTO.
- the normal load is “maximum load capacity” defined by JATMA, the maximum value described in “TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES” defined by TRA, or “LOAD CAPACITY” defined by ETRTO.
- the design end D is the outermost end in the tire width direction of the tread portion 2 and is the outermost end in the tire width direction in which the auxiliary grooves 5 and the narrow grooves 6 are formed. In FIG. It is shown continuously in the tire circumferential direction.
- first auxiliary groove 5A and the second auxiliary groove 5B are provided to bend in the opposite direction while being inclined in the opposite direction to the tire width direction.
- one of the first auxiliary groove 5A and the second auxiliary groove 5B may be formed along the tire width direction and the other may be provided inclined in the tire width direction.
- the third auxiliary groove 5C is formed in the third land portion 4C with an end portion away from the first circumferential groove 3A on the outermost side of the vehicle. More specifically, the third auxiliary groove 5C is disposed at the design end D, which is the third land portion 4C and outside the vehicle at the ground contact end T, and is separated from the first circumferential groove 3A. The other end terminates in the portion 4C.
- the third auxiliary groove 5C is provided to bend in the opposite direction while being inclined in the same direction with respect to the tire width direction as compared with the second auxiliary groove 5B.
- the third auxiliary groove 5C is formed away from the first circumferential groove 3A, but the decorative groove 7 is interposed between the other end that terminates and the first circumferential groove 3A.
- the decorative groove 7 is formed to have a groove width and a groove depth equal to or smaller than the third auxiliary groove 5 ⁇ / b> C, and is lost due to wear during the initial use of the pneumatic tire 1.
- the effect of improving braking performance on the road surface on snow can be assisted by the edge effect of the third auxiliary groove 5C.
- the rigidity of the third land portion 4C is improved by forming the end portion of the third auxiliary groove 5C away from the first circumferential groove 3A, the effect of improving the braking performance on the dry road surface is achieved. Can help.
- the tread portion 2 has a first block 8A that is partitioned by a first circumferential groove 3A, a second circumferential groove 3B, and a plurality of first auxiliary grooves 5A in the first land portion 4A. Moreover, the tread part 2 has the 2nd block 8B each divided by the 3rd circumferential groove
- the narrow groove 6 includes a first narrow groove 6A, a second narrow groove 6B, a third narrow groove 6C1 and 6C2, a fourth narrow groove 6D, a fifth narrow groove 6E, a sixth narrow groove 6F1 and 6F2, and a seventh narrow groove. Grooves 6G1 and 6G2 and an eighth narrow groove 6H are provided.
- the first narrow groove 6A is provided between the first auxiliary grooves 5A in the tire circumferential direction. One end of the first narrow groove 6A communicates with the first circumferential groove 3A, and the other end communicates with the second circumferential groove 3B.
- the first narrow groove 6A is provided so as to pass through the middle between the plurality of first auxiliary grooves 5A, that is, the central portion of the first block 8A.
- the second narrow groove 6B is formed in the second block 8B so as to be curved to the same side while being inclined in the same direction with respect to the tire width direction as compared with the second auxiliary groove 5B.
- the second narrow groove 6B is arranged as a set of a plurality of (two in this embodiment), one end communicating with the third circumferential groove 3C and the other end communicating with the fourth circumferential groove 3D. Is provided.
- the third narrow grooves 6C1 and 6C2 are provided in the tire circumferential direction of the third auxiliary groove 5C, and are provided in the third land portion 4C.
- the third narrow grooves 6C1 and 6C2 are formed to bend on the same side while being inclined in the same direction with respect to the tire width direction as compared with the third auxiliary groove 5C.
- the third narrow grooves 6C1 and 6C2 are arranged as a set of a plurality (two in the present embodiment), one end portion of which communicates with the first circumferential groove 3A, and the tire width beyond the ground contact end T. Each other end part is connected by the 4th fine groove 6D in the position of the direction outer side.
- the edge effect is improved, and the effect of improving the braking performance on the road surface on snow can be assisted.
- the edge effect can be further improved, and the effect of improving the braking performance on the road surface on snow can be further assisted.
- the edge effect is improved, so that the braking performance on wet road surfaces is improved. Can help.
- the edge effect is further improved, so that the effect of improving the braking performance on the road surface on snow can be assisted.
- At least one fifth narrow groove (first auxiliary groove narrow groove) 6E is provided between the first auxiliary grooves 5A in the fourth land portion 4D.
- the sixth narrow grooves (thin grooves between the second auxiliary grooves) 6F1 and 6F2 are provided between the second auxiliary grooves 5B in the fourth land portion 4D.
- the seventh narrow grooves 6G1 and 6G2 are provided between the second auxiliary grooves 5B in the tire circumferential direction, and are provided in the fifth land portion 4E.
- the seventh narrow grooves 6G1 and 6G2 are formed to bend in the same direction while being inclined in the same direction with respect to the tire width direction as compared with the second auxiliary groove 5B.
- the seventh narrow grooves 6G1 and 6G2 are arranged as a set of a plurality (two in this embodiment), one end portion of which communicates with the fourth circumferential groove 3D, and the tire width is larger than the ground contact end T. Each other end is connected by the eighth narrow groove 6H at a position on the outer side in the direction.
- the sixth fine groove 6F1, the second fine groove 6B, and the seventh fine groove 6G1 may be provided continuously through the third circumferential groove 3C and the fourth circumferential groove 3D, or separately. It may be provided.
- the sixth fine groove 6F2, the second fine groove 6B, and the seventh fine groove 6G2 may be provided continuously through the third circumferential groove 3C and the fourth circumferential groove 3D, or separately. It may be provided.
- a circumferential narrow groove 3S extending in a zigzag shape along the tire circumferential direction is formed on the tread surface 2a of the first land portion 4A.
- the circumferential narrow groove 3S has a zigzag shape in which first bent portions 31 and second bent portions 32 that are bent to the opposite side of the first bent portions 31 are alternately formed.
- the first bent portion 31 and the second bent portion 32 are located near the center of the first block 8A.
- the vicinity of the center of the first block 8A where the first bent portion 31 and the second bent portion 32 are located means a range within 25% from the center of the first block 8A in the tire width direction.
- the first bent portion 31 and the second bent portion 32 are located in a range within 25% of the distance in the tire circumferential direction from the center of the first block 8A to the first auxiliary groove 5A. .
- the circumferential narrow groove 3S In the circumferential narrow groove 3S, a portion between the first bent portion 31 and the second bent portion 32 intersects with the first narrow groove 6A. And in the 1st block 8A, the circumferential direction fine groove 3S has a part between the 1st bending part 31 and the 2nd bending part 32 including the part which cross
- the circumferential narrow groove 3S is, for example, 0.5 mm or more and the other circumferential grooves 3A, 3B, 3C, 3D or less, and the other circumferential grooves 3A, 3B, 3C, 3D or less. The one with groove depth.
- FIG. 2 is a partially enlarged plan view of the pneumatic tire according to the present embodiment, and is an enlarged plan view in the vicinity of the third circumferential groove 3C.
- chamfers 3C1 and 3C2 are provided at the opening edges on both sides in the tire width direction in the third circumferential groove 3C.
- the chamfer 3C1 is provided at the opening edge of the third circumferential groove 3C on the second land portion 4B side, and the chamfer width gradually changes between the second auxiliary grooves 5B and is formed in a substantially triangular shape.
- the chamfer 3C2 is provided at the opening edge of the third circumferential groove 3C on the fourth land portion 4D side, and the chamfering width gradually changes in the tire circumferential direction between the second auxiliary grooves 5B. Is formed.
- the chamfers 3C1 and 3C2 are arranged by reversing the substantially triangular shape in which the chamfer width gradually changes at the opening edges on both sides of the third circumferential groove 3C.
- the chamfers 3C1 and 3C2 may be formed such that the chamfer width is parallel to the tire circumferential direction.
- FIG. 3 is a partially enlarged plan view of the pneumatic tire according to the present embodiment, and is an enlarged plan view in the vicinity of the fourth land portion 4D.
- the pneumatic tire 1 of the present embodiment has a plurality of first auxiliary grooves 5A that terminate in the fourth land portion 4D and are provided in the tire circumferential direction.
- the second auxiliary groove 5B terminates in the fourth land portion 4D, and a plurality of tires are provided in the tire circumferential direction.
- the first auxiliary grooves 5A and the second auxiliary grooves 5B are alternately arranged without intersecting.
- At least one fifth fine groove 6E is provided between the first auxiliary grooves 5A.
- one fifth narrow groove 6E is provided.
- the sixth fine grooves 6F1 and 6F2 having a larger number than the number of the fifth fine grooves 6E are provided between the second auxiliary grooves 5B.
- two sixth fine grooves 6F1 and 6F2 are provided.
- the longer sixth fine groove 6F1 is the shorter sixth fine groove due to the rotation of the tire during traveling in the forward direction.
- the length of the groove refers to the length of the center line connecting the midpoints of the width of the groove.
- the length a of the longer sixth narrow groove 6F1 is: 0.4 * W2 ⁇ a ⁇ 0.7 * W2 It is preferable that The sixth fine groove 6F1 is preferably shorter than the length of the adjacent second auxiliary groove 5B, and particularly preferably about 50% in length. If the sixth fine groove 6F1 is made longer, the block rigidity is lowered and the braking performance on the dry road surface is lowered.
- the length of the sixth fine groove 6F1 with the longer length is a
- the length of the sixth fine groove 6F2 with the shorter length is Where b is 0.7a ⁇ b ⁇ 0.9a It is preferable that in particular, it is preferable that the adjacent two sixth fine grooves 6F1 and 6F2 be approximately 80% of the shorter sixth fine groove 6F2 of the longer sixth fine groove 6F1.
- the shape of the fifth fine groove 6E and the sixth fine grooves 6F1 and 6F2 may be a linear shape or a curved shape.
- the shapes of the fifth fine groove 6E and the sixth fine grooves 6F1 and 6F2 are preferably formed as arcs. By using an arc, the support of the block can be produced and the braking performance on the road surface on snow can be improved.
- 4A and 4B are diagrams illustrating the relationship between the direction of the shape of the fifth fine groove 6E and the direction of the shape of the sixth fine grooves 6F1 and 6F2.
- the curved shape of the fifth fine groove 6E and the curved shape of the sixth fine grooves 6F1 and 6F2 are formed in opposite directions so as to face each other. That is, the fifth fine groove 6E and the sixth fine groove 6F1 are arranged such that one convex direction of the curved shape faces the tire rotating direction and the concave direction of the other curved shape faces the tire rotating direction. Similarly, the fifth fine groove 6E and the sixth fine groove 6F2 are also arranged so that one curved convex direction faces the tire rotating direction and the other curved concave direction faces the tire rotating direction. .
- the fifth fine groove 6E and the sixth fine groove 6F1 have a relationship in which the distances L1 and L2 in the tire circumferential direction at both ends in the tire width direction are shorter than the distance L3 in the tire circumferential direction at the center in the tire width direction. It is arranged.
- the fifth fine groove 6E and the sixth fine groove 6F1 are both arranged so that the concave direction of the curved shape faces the tire rotation direction.
- the distance L2 in the tire circumferential direction at one end in the tire width direction is shorter than the distance L3 in the tire circumferential direction at the center in the tire width direction.
- the distance L1 in the tire circumferential direction at the other end in the tire width direction is arranged so as to be longer than the distance L3 in the tire circumferential direction at the center in the tire width direction.
- the concave shape of the curved shape of the fifth fine groove 6E and the sixth fine groove 6F1 is directed in the same direction as in FIG. 4B, and the convex direction of one curved shape as in FIG. 4A. It is preferably arranged in the opposite direction so that the direction of rotation is the tire rotation direction and the concave direction of the other curved shape is the rotation direction of the tire. The same applies to the relationship between the fifth fine groove 6E and the sixth fine groove 6F2.
- one of the curved convex directions is directed to the tire rotation direction, and the other is the curved concave direction is the tire.
- the narrow grooves support each other, and the braking performance on the dry road surface can be improved without deteriorating the braking performance on the road surface on snow.
- the rigidity can be changed between the vehicle inner side and the vehicle outer side with respect to the tire equatorial plane CL, and the braking performance on the dry road surface, particularly the performance at the time of turning can be improved.
- first auxiliary groove 5A is disposed outside the vehicle and the second auxiliary groove 5B is disposed inside the vehicle.
- the rigidity on the outside of the vehicle can be increased, and the braking performance on the dry road surface, particularly the performance during turning can be improved.
- FIG. 5 is a diagram schematically showing the configuration of FIG. Referring to FIG. 5, a circumferential narrow groove 3S is provided between the first circumferential groove 3A and the second circumferential groove 3B.
- the first auxiliary groove 5A is provided so as to communicate the first circumferential groove 3A and the second circumferential groove 3B.
- the first narrow groove 6A is provided between the first auxiliary grooves 5A. The first narrow groove 6A passes through the circumferential narrow groove 3S.
- the second auxiliary groove 5B is provided so as to communicate the third circumferential groove 3C and the fourth circumferential groove 3D.
- the second narrow groove 6B is provided between the second auxiliary grooves 5B. According to such a configuration, it is possible to stabilize the braking performance when traveling straight on a snowy road surface and during cornering (turning).
- FIG. 6 is a diagram schematically showing a modified example having one circumferential groove.
- the pneumatic tire of this example has a circumferential narrow groove 3BC instead of the second circumferential groove 3B and the third circumferential groove 3C.
- the number of circumferential grooves other than the circumferential narrow grooves 3S is only one circumferential narrow groove 3BC.
- the first narrow groove 6A is provided between the first auxiliary grooves 5A and penetrates the circumferential narrow groove 3S.
- the second narrow groove 6B is provided between the second auxiliary grooves 5B. According to such a configuration, it is possible to stabilize the braking performance during straight traveling and cornering on the road surface on snow.
- FIG. 7 is a diagram schematically showing a modified example having three circumferential grooves.
- the pneumatic tire of this example has a circumferential narrow groove 3BC instead of the second circumferential groove 3B and the third circumferential groove 3C.
- the first circumferential groove 6A is provided between the first auxiliary grooves 5A and penetrates the circumferential narrow groove 3S.
- the second narrow groove 6B is provided between the second auxiliary grooves 5B. According to such a configuration, it is possible to stabilize the braking performance during straight traveling and cornering on the road surface on snow.
- the pneumatic tire 1 of the present embodiment has the asymmetric tread portion 2 with respect to the tire equatorial plane CL, and the tread portion 2 is formed on the outer side in the tire width direction with respect to the tire equatorial plane CL.
- the first land portion 4A and the second land portion 4B formed inside the tire width direction on the basis of the tire equatorial plane CL.
- the first land portion 4A includes a circumferential narrow groove 3S extending in the circumferential direction.
- a first narrow groove 6A that penetrates the groove 3S is formed, and the second land portion 4B is partitioned by a plurality of second auxiliary grooves 5B and a plurality of second auxiliary grooves 5B that are periodically provided in the circumferential direction.
- the braking performance at the time of straight traveling on the snow road surface and cornering can be stabilized, and the wet road surface can be stabilized.
- the effect of improving the braking performance can be assisted.
- the circumferential narrow groove 3S has a zigzag shape in which the first bent portion 31 and the second bent portion 32 that is bent on the opposite side of the first bent portion 31 are alternately formed.
- the first bent portion 31 and the second bent portion 32 are located near the center of the first block 8A.
- the edge effect can be improved by the zigzag-shaped circumferential narrow groove 3 ⁇ / b> S having more edges than the straight, and the effect of improving the braking performance on the snowy road surface can be assisted. Further, since the zigzag bent portion is located near the center of the land portion, the rigidity of the block can be maintained as compared with the case where the bent portion is located at the end of the land portion.
- the circumferential narrow groove 3S includes a first narrow groove 6A at a portion between the first bent portion 31 and the second bent portion 32 in one first block 8A.
- the part between the first bent part 31 and the second bent part 32 including the part that intersects the first narrow groove 6A is shorter than the other parts.
- the zigzag portion is located in the center of the block, and the narrow groove penetrates the block, so that the block can be divided almost equally into four, and the rigidity from either the front or rear and lateral directions Therefore, the braking performance on the dry road surface can be maintained.
- the tread portion 2 includes the first circumferential groove 3A provided on the outer side in the tire width direction of the first land portion 4A and the outer side in the tire width direction of the first circumferential groove 3A.
- the third land portion 4C further includes a non-through third auxiliary groove 5C in the first circumferential groove 3A.
- this pneumatic tire 1 it is possible to assist the effect of improving the braking performance on the road surface on snow by having a non-penetrating auxiliary groove in the circumferential groove in the outer land portion, and to block by making a rib shape
- the braking performance on the dry road surface can be improved by increasing the rigidity.
- a plurality of the third auxiliary grooves 5C are formed in the tire circumferential direction, and at least two third land portions 4C are provided between the third auxiliary grooves 5C.
- a fourth fine groove 6D that is connected and extends in the circumferential direction is formed.
- this pneumatic tire 1 by arranging at least two narrow grooves, an edge effect can be brought out in the land, and the drainage can be enhanced as well as the braking performance on the road surface on snow.
- the tread portion 2 is formed at the outer end in the tire width direction of the first land portion 4A, and the first circumferential groove 3A that partitions the first land portion 4A; Formed at the end of the first land portion 4A on the inner side in the tire width direction, formed at the second circumferential groove 3B that partitions the first land portion 4A, and at the end of the second land portion 4B on the inner side in the tire width direction, A third circumferential groove 3C that divides the second land portion 4B, and a fourth circumferential groove 3D that is formed at the outer end in the tire width direction of the second land portion 4B and divides the second land portion 4B.
- the first land portion 4A is partitioned by a first circumferential groove 3A and a second circumferential groove 3B provided from the first circumferential groove 3A to the tire equatorial plane CL.
- the third circumferential groove 3C provided from the tire equatorial plane CL of the second land portion 4B and the outer side in the tire width direction of the second land portion 4B
- a fourth land portion 4D that is defined by the fourth circumferential groove 3D and that is defined by the second circumferential groove 3B and the third circumferential groove 3C and that is positioned on the tire equatorial plane CL.
- the first auxiliary groove 5A extends through the second land portion 4D through the second circumferential groove 3B and terminates at the fourth land portion 4D.
- the second auxiliary groove 5B It extends through 3C to the fourth land portion 4D and terminates at the fourth land portion 4D.
- This pneumatic tire 1 has four circumferential grooves and forms a land portion on the tire equatorial plane CL.
- the land portion of the center portion of the tread surface is not made into a block shape but is made into a rib, so that the braking performance on the dry road surface can be improved.
- the third circumferential groove 3C is provided with chamfers 3C1 and 3C2 at the opening edges on both sides in the tire width direction.
- the chamfers 3C1 and 3C2 are formed such that the chamfer width gradually changes in the tire circumferential direction between the second auxiliary grooves 5B, and the third circumference The direction grooves 3C are reversed and arranged at the opening edges on both sides.
- the chamfering is reversed and formed alternately at the opening edges on both sides of the third circumferential groove, so that the snow drainage is improved, so that the braking performance on the road surface on snow is improved.
- the improvement effect can be supported.
- the fourth land portion 4D has a position where the first auxiliary groove 5A penetrating the second circumferential groove 3B terminates and a second portion penetrating the third circumferential groove 3C.
- the positions where the auxiliary grooves 5B end are alternately arranged in the tire circumferential direction.
- the pneumatic tire 1 it is possible to achieve both wear resistance performance on a dry road surface and braking performance on a wet road surface and a snowy road surface.
- the fourth land portion 4D is partitioned by the second circumferential groove 3B and the third circumferential groove 3C, and the first auxiliary groove 5A is formed in the fourth land portion 4D.
- a plurality of second auxiliary grooves 5B that terminate in the tire circumferential direction and end in the fourth land portion 4D and that are provided in the tire circumferential direction are provided, the first auxiliary groove 5A and the second auxiliary groove 5B.
- Six auxiliary grooves 6F1 and 6F2 provided more than 6E are further included.
- the pneumatic tire 1 it is possible to achieve both wear resistance performance on a dry road surface and braking performance on a wet road surface and a snowy road surface.
- the sixth fine grooves 6F1 and 6F2 have different lengths depending on the positions between the second auxiliary grooves 5B, and the longer grooves when traveling in the forward direction. However, it should be grounded before the shorter groove.
- the pneumatic tire 1 can maintain braking performance on a dry road surface and improve braking performance on a snowy road surface.
- the fourth land portion 4D has the length of the formed sixth auxiliary groove 6F1 with the longer length when the length of the formed second auxiliary groove 5B is W2.
- Length a is 0.4 * W2 ⁇ a ⁇ 0.7 * W2 It is.
- the block rigidity can be maintained and the braking performance on the dry road surface can be maintained.
- the length of the sixth fine groove 6F1 having the longer length among the at least two sixth fine grooves 6F1 and 6F2 having different lengths is indicated by a.
- the length of the shorter sixth narrow groove 6F2 is b, 0.7a ⁇ b ⁇ 0.9a It is.
- the block rigidity can be maintained and the braking performance on the dry road surface can be maintained.
- the sixth fine grooves 6F1 and 6F2 have a curved shape.
- the support of the block can be produced and the braking performance on the road surface on snow can be improved.
- the shape of the fifth fine groove 6E is a curved shape
- the curved shape of the fifth fine groove 6E and the curved shape of the sixth fine grooves 6F1, 6F2 are one of the curved shapes. It is arranged so that the convex direction of the curved shape faces the tire rotating direction and the concave direction of the other curved shape faces the tire rotating direction, and the distance in the tire circumferential direction at both ends in the tire width direction is the center in the tire width direction. It is shorter than the distance in the tire circumferential direction.
- the narrow grooves support each other, and the braking performance on the dry road surface can be improved without deteriorating the braking performance on the road surface on snow.
- the fourth land portion 4D has the length of the formed first auxiliary groove 5A as W1, and the length of the formed second auxiliary groove 5B as W2. In case, W1 ⁇ W2 It is.
- the rigidity can be changed between the vehicle inner side and the vehicle outer side with respect to the tire equatorial plane CL, and the braking performance on the dry road surface, particularly the performance during turning can be improved.
- the first auxiliary groove 5A is disposed on the outer side in the tire width direction
- the second auxiliary groove 5B is disposed on the inner side in the tire width direction.
- the braking performance on a dry road surface, particularly the performance during turning can be improved by increasing the rigidity on the outside of the vehicle.
- the first auxiliary groove 5A and the second auxiliary groove 5B are arranged in the fourth land portion 4D.
- the first auxiliary groove and the second auxiliary groove are arranged in the center of the tread surface, and both improvement in wear resistance performance on a dry road surface and improvement in braking performance on a wet road surface and on a snowy road surface are achieved. can do.
- the pneumatic tire 1 of the present embodiment further includes a fifth land portion 4E provided inside the fourth circumferential groove 3D in the tire width direction, and the second auxiliary groove 5B includes the fifth land portion 4E and the fifth land portion 4E. It penetrates the four circumferential grooves 3D.
- the rigidity on the outside of the vehicle can be increased, and the braking performance on a dry road surface, particularly the performance during turning can be improved.
- a plurality of the second auxiliary grooves 5B are provided in the tire circumferential direction, and at least two seventh narrow grooves 6G1, between the second auxiliary grooves 5B, 6G2 is provided, and at least two of the seventh narrow grooves 6G1 and 6G2 are connected to each other by an eighth narrow groove 6H whose one end communicates with the fourth circumferential groove 3D and whose other end extends in the circumferential direction. linked.
- this pneumatic tire 1 by arranging at least two narrow grooves, an edge effect can be brought out in the land, and the drainage can be enhanced as well as the braking performance on the road surface on snow.
- the first fine groove 6A, the second fine groove 6B, the third fine grooves 6C1 and 6C2, the fourth fine groove 6D, the seventh fine grooves 6G1 and 6G2, and the eighth fine groove 6H, the 5th fine groove 6E, and the 6th fine groove 6F1 and 6F2 are formed in the range whose groove width is 0.4 mm or more and 1.2 mm or less.
- each narrow groove is configured as a so-called sipe, the edge effect is improved and the effect of improving the braking performance on the road surface on snow can be assisted.
- performance tests on a braking performance on a wet road surface, a braking performance on a snowy road surface, and a braking performance on a dry road surface were performed on a plurality of types of test tires having different conditions.
- the method for evaluating the braking performance on wet roads is to measure the braking distance from a speed of 100 km / h on a test course on a wet road with a water depth of 1 mm using the test vehicle. Based on this measurement result, index evaluation is performed with the conventional example 1 as a reference (100). This evaluation is preferable as the numerical value increases.
- the evaluation method of the braking performance on the road surface on snow measures the braking distance in ABS (Anti-lock Braking System) braking from 40 km / h on the test course of the snow compression road surface with the above test vehicle. Based on this measurement result, index evaluation is performed with the conventional example 1 as a reference (100). This evaluation is preferable as the numerical value increases.
- ABS Anti-lock Braking System
- the evaluation method of the turning performance on the snowy road surface is performed by sensory evaluation by a test driver with respect to the turning stability during cornering by running the test course on the snowy road surface at a speed of 40 km / h with the test vehicle.
- This sensory evaluation is index evaluation based on the pneumatic tire of Conventional Example 1 (100). This evaluation shows that the larger the value, the better the turning performance on the road surface on snow.
- index evaluation is performed with the conventional example 1 as a reference (100). This evaluation is preferable as the numerical value increases.
- the evaluation method of the turning performance on the dry road surface is that the test vehicle runs on a flat and dry test course at a speed of 60 [km / h] to 100 [km / h], and the turning stability during cornering is as follows. Perform by sensory evaluation with a test driver. This sensory evaluation is index evaluation based on the pneumatic tire of Example 11 (100). This evaluation shows that the larger the value, the better the turning performance on the dry road surface.
- the evaluation method of uneven wear resistance performance on dry road surface is the uneven wear (side rib-shaped land) generated in the rib-shaped land portion after running 50,000 [km] at an average speed of 60 [km / h] on the test vehicle.
- the difference in the amount of wear on the tread surface between the part and the other rib-like land part) is measured. Then, based on this measurement result, index evaluation using Example 11 as a reference (100) is performed. This evaluation indicates that the larger the value, the better the uneven wear resistance performance.
- the pneumatic tire of Conventional Example 1 shown in Table 1 has a shape in which the number of circumferential grooves (main grooves) is four and the first auxiliary grooves 5A and the second auxiliary grooves 5B penetrate the circumferential grooves.
- the pneumatic tire of Conventional Example 1 has a shape in which the first auxiliary grooves 5A and the second auxiliary grooves 5B are alternately arranged.
- the pneumatic tire of Conventional Example 1 has two narrow grooves on the first auxiliary groove 5A side and two narrow grooves on the second auxiliary groove 5B side. In the pneumatic tire of Conventional Example 1, the length of the narrow groove on the second auxiliary groove 5B side is the same.
- the length a of the narrow groove 6F1 on the second auxiliary groove 5B side is the same as the length W2 of the second auxiliary groove 5B, and the length of the narrow groove 6F2 on the second auxiliary groove 5B side.
- the length b is the same as the length a of the narrow groove 6F1.
- the shapes of the narrow grooves 6E, 6F1, and 6F2 are straight lines.
- the arrangement of the narrow grooves 6E with respect to the narrow grooves 6F1 and 6F2 is the same direction.
- the length W1 of the first auxiliary groove 5A is the same as the length W2 of the second auxiliary groove 5B.
- the position of the first auxiliary groove 5A is the vehicle inner side and the position of the second auxiliary groove 5B is the vehicle outer side.
- the width of each narrow groove is 0.8 mm.
- the number of circumferential grooves (main grooves) is two, and the first auxiliary grooves 5A and the second auxiliary grooves 5B formed in the fourth land portion 4D are provided.
- the pneumatic tires of Examples 14 to 16 have four circumferential grooves (main grooves) and the fourth land portion 4D has a shape that does not penetrate (non-penetrate) into the circumferential grooves.
- the first auxiliary groove 5 ⁇ / b> A and the second auxiliary groove 5 ⁇ / b> B formed in the shape are communicated with the circumferential groove.
- the pneumatic tires of Examples 1 to 16 have a shape in which the first auxiliary grooves 5A and the second auxiliary grooves 5B are alternately arranged in the fourth land portion 4D.
- the number of narrow grooves on the first auxiliary groove 5A side is one and the number of narrow grooves on the second auxiliary groove 5B side is two.
- the pneumatic tire of Example 16 has two fine grooves on the first auxiliary groove 5A side and two fine grooves on the second auxiliary groove 5B side.
- the pneumatic tire of Example 1 has the same length of the narrow groove on the second auxiliary groove 5B side, and the pneumatic tires of Examples 2 to 16 have the length of the narrow groove on the second auxiliary groove 5B side.
- the shapes are different in length (change in length).
- the length a of the narrow groove 6F1 on the second auxiliary groove 5B side is the same as the length W2 of the second auxiliary groove 5B.
- the length a of the narrow groove 6F1 on the second auxiliary groove 5B side is 30% (0.3 * W2), 40% (0.4 * W2) of the length W2 of the second auxiliary groove 5B, They are 50% (0.5 * W2), 70% (0.7 * W2), and 80% (0.8 * W2).
- the length b of the narrow groove 6F2 on the second auxiliary groove 5B side is the same as the length a of the narrow groove 6F1, and the pneumatic tires of Examples 8 to 16 are used.
- the length b of the narrow groove 6F2 on the second auxiliary groove 5B side is 60% (0.6 * a), 70% (0.7 * a), and 80% (0) of the length a of the narrow groove 6F1. 8 * a) and 90% (0.9 * a).
- the shapes of the narrow grooves 6E, 6F1, and 6F2 are linear, and in the pneumatic tires of Examples 12 to 16, the shapes of the narrow grooves 6E, 6F1, and 6F2 are formed. It is a curve.
- the arrangement of the narrow grooves 6E with respect to the narrow grooves 6F1 and 6F2 is the same direction, and the pneumatic tires of Examples 13 to 16 are thin with respect to the narrow grooves 6F1 and 6F2.
- the arrangement of the grooves 6E is opposite.
- the length W1 of the first auxiliary groove 5A is the same as the length W2 of the second auxiliary groove 5B, and the pneumatic tires of Examples 14 to 16 are The relationship between the length W1 of the first auxiliary groove 5A and the length W2 of the second auxiliary groove 5B is W1 ⁇ W2.
- the position of the first auxiliary groove 5A is inside the vehicle and the position of the second auxiliary groove 5B is outside the vehicle.
- the pneumatic tires of Examples 15 and 16 are the first The position of the auxiliary groove 5A is the vehicle outer side, and the position of the second auxiliary groove 5B is the vehicle inner side.
- each narrow groove is 1.3 mm
- the width of each narrow groove is 0.6 mm.
- the pneumatic tire of Comparative Example 1 shown in Table 1 has a shape in which the number of circumferential grooves (main grooves) is two and the first auxiliary grooves 5A and the second auxiliary grooves 5B do not penetrate the circumferential grooves. is there.
- the pneumatic tire of Comparative Example 1 has a shape in which one of the first auxiliary groove 5A and the second auxiliary groove 5B is disposed only on one side.
- the pneumatic tire of Comparative Example 1 has one narrow groove on the first auxiliary groove 5A side and one narrow groove on the second auxiliary groove 5B side. In the pneumatic tire of Comparative Example 1, the length of the narrow groove on the second auxiliary groove 5B side is the same.
- the length a of the narrow groove 6F1 on the second auxiliary groove 5B side is the same as the length W2 of the second auxiliary groove 5B, and the length of the narrow groove 6F2 on the second auxiliary groove 5B side.
- the length b is the same as the length a of the narrow groove 6F1.
- the shapes of the narrow grooves 6E, 6F1, and 6F2 are curves.
- the arrangement of the narrow grooves 6E with respect to the narrow grooves 6F1 and 6F2 is the same direction.
- the length W1 of the first auxiliary groove 5A is the same as the length W2 of the second auxiliary groove 5B.
- the position of the first auxiliary groove 5A is on the vehicle outer side.
- the width of each narrow groove is 0.6 mm.
- the pneumatic tires of Examples 1 to 16 have braking performance on wet road surfaces (“wet performance (braking performance)” in Table 1), braking performance on snowy road surfaces ( It can be seen that the “snow performance (braking performance)” in Table 1 and the braking performance on the dry road surface (“dry performance (braking performance)” in Table 1 are improved. It can be seen that the “dry performance (swivel performance)” in Table 1) and the wear resistance performance on dry road surfaces (“dry road surface wear resistance performance” in Table 1) are improved.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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Abstract
Description
0.4*W2≦a≦0.7*W2
であることが好ましい。第六細溝6F1は、隣り合う第二補助溝5Bの長さより短くすることが好ましく、特に約50%の長さとすることが好ましい。第六細溝6F1をそれ以上長くすると、ブロック剛性が下がり、乾燥路面での制動性能が低下する。
0.7a≦b≦0.9a
であることが好ましい。特に、隣り合う2本の第六細溝6F1、6F2同士については、短い方の第六細溝6F2の長さが長い方の第六細溝6F1の約80%とすることが好ましい。
W1≦W2
であることが好ましい。こうすることにより、タイヤ赤道面CLに対して車両内側と車両外側とで剛性を変えることができ、乾燥路面での制動性能、特に旋回時の性能を向上させることができる。
0.4*W2≦a≦0.7*W2
である。
0.7a≦b≦0.9a
である。
W1≦W2
である。
乾燥路面での制動性能の評価方法は、上記試験車両にて乾燥路面のテストコースで時速100km/hからの制動距離が測定される。そして、この測定結果に基づいて従来例1を基準(100)とした指数評価が行われる。この評価は、数値が大きいほど好ましい。
2 トレッド部
2a トレッド面
3 周方向溝
3A 第一周方向溝
3B 第二周方向溝(内側周方向溝)
3BC 周方向細溝
3C 第三周方向溝(外側周方向溝)
3C1、3C2 面取
3D 第四周方向溝
3S 周方向細溝
4 陸部
4A 第一陸部
4B 第二陸部
4C 第三陸部
4D 第四陸部(周方向溝間陸部)
4E 第五陸部
5 補助溝
5A 第一補助溝
5B 第二補助溝
5C 第三補助溝
6 細溝
6A 第一細溝
6B 第二細溝
6C1、6C2 第三細溝
6D 第四細溝
6E 第五細溝(第一補助溝間細溝)
6F1、6F2 第六細溝(第二補助溝間細溝)
6G1、6G2 第七細溝
6H 第八細溝
7 飾溝
8A 第一ブロック
8B 第二ブロック
31 第一折れ曲がり部
32 第二折れ曲がり部
CL タイヤ赤道面
D デザインエンド
T 接地端
Claims (10)
- トレッド部に設けられ、かつ、タイヤ周方向に延在して設けられた内側周方向溝および外側周方向溝と、
前記内側周方向溝と前記外側周方向溝とによって区画された周方向溝間陸部とを含み、
前記周方向溝間陸部は、
タイヤ周方向に複数設けられ、前記内側周方向溝に連通し、かつ、前記周方向溝間陸部内で終端する第一補助溝と、
タイヤ周方向に複数設けられ、前記外側周方向溝に連通し、かつ、前記周方向溝間陸部内で終端する第二補助溝と、
が形成され、
前記第一補助溝と前記第二補助溝とは交わることなく交互に配置され、
前記第一補助溝同士の間に少なくとも1本設けられた第一補助溝間細溝と、
前記第二補助溝同士の間に設けられ、かつ、前記第一補助溝間細溝より多い本数設けられた第二補助溝間細溝とを含む空気入りタイヤ。 - 前記第二補助溝間細溝は、前記第二補助溝同士の間の位置により長さが異なり、
前進方向への走行時に長さの長い方の溝が、短い方の溝よりも先に接地する
請求項1に記載の空気入りタイヤ。 - 前記周方向溝間陸部は、
形成された前記第二補助溝の長さをW2とした場合に、前記長さの長い方の第二補助溝間細溝の長さaが、
0.4*W2≦a≦0.7*W2
である
請求項2に記載の空気入りタイヤ。 - 長さの異なる少なくとも2本の前記第二補助溝間細溝のうち、
長さの長い方の第二補助溝間細溝の長さをa、長さの短い方の第二補助溝間細溝の長さをbとした場合に、
0.7a≦b≦0.9a
である
請求項1から請求項3のいずれか1項に記載の空気入りタイヤ。 - 前記第二補助溝間細溝は、曲線形状である
請求項1から請求項4のいずれか1項に記載の空気入りタイヤ。 - 前記第一補助溝間細溝の形状は、曲線形状であり、
前記第一補助溝間細溝の曲線形状と前記第二補助溝間細溝の曲線形状とは、一方の曲線形状の凸方向がタイヤ回転方向に向き、他方の曲線形状の凹方向がタイヤ回転方向に向くように配置され、
タイヤ幅方向の両端部におけるタイヤ周方向の距離が、タイヤ幅方向の中央におけるタイヤ周方向の距離よりも短い
請求項5に記載の空気入りタイヤ。 - 前記周方向溝間陸部は、
形成された前記第一補助溝の長さをW1とし、形成された前記第二補助溝の長さをW2とした場合に、
W1≦W2
である
請求項1から請求項6のいずれか1項に記載の空気入りタイヤ。 - 前記第一補助溝はタイヤ幅方向の外側に配置され、
前記第二補助溝はタイヤ幅方向の内側に配置される
請求項1から請求項7のいずれか1項に記載の空気入りタイヤ。 - 前記周方向溝間陸部は、タイヤ赤道面上に配置される
請求項8に記載の空気入りタイヤ。 - 前記第一補助溝間細溝および前記第二補助溝間細溝は、溝幅が0.4mm以上1.2mm以下である
請求項1から請求項9のいずれか1項に記載の空気入りタイヤ。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020167028601A KR101898453B1 (ko) | 2014-09-05 | 2015-08-27 | 공기입 타이어 |
US15/502,432 US11241918B2 (en) | 2014-09-05 | 2015-08-27 | Pneumatic tire |
JP2015562610A JP6620557B2 (ja) | 2014-09-05 | 2015-08-27 | 空気入りタイヤ |
CN201580046404.7A CN106604833A (zh) | 2014-09-05 | 2015-08-27 | 充气轮胎 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014-181613 | 2014-09-05 | ||
JP2014181613 | 2014-09-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2016035660A1 true WO2016035660A1 (ja) | 2016-03-10 |
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Family Applications (1)
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PCT/JP2015/074164 WO2016035660A1 (ja) | 2014-09-05 | 2015-08-27 | 空気入りタイヤ |
Country Status (5)
Country | Link |
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US (1) | US11241918B2 (ja) |
JP (1) | JP6620557B2 (ja) |
KR (1) | KR101898453B1 (ja) |
CN (1) | CN106604833A (ja) |
WO (1) | WO2016035660A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108725100A (zh) * | 2017-04-18 | 2018-11-02 | 住友橡胶工业株式会社 | 轮胎 |
JP2019043307A (ja) * | 2017-08-31 | 2019-03-22 | Toyo Tire株式会社 | 空気入りタイヤ |
JP2019051896A (ja) * | 2017-09-19 | 2019-04-04 | 住友ゴム工業株式会社 | タイヤ |
JP2019182407A (ja) * | 2018-04-06 | 2019-10-24 | 住友ゴム工業株式会社 | タイヤ |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11135877B2 (en) * | 2017-09-19 | 2021-10-05 | Sumitomo Rubber Industries, Ltd. | Tire |
JP7106950B2 (ja) * | 2018-04-04 | 2022-07-27 | 住友ゴム工業株式会社 | タイヤ |
CN110422015B (zh) * | 2018-05-01 | 2022-10-11 | 住友橡胶工业株式会社 | 轮胎 |
Citations (5)
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JPH0379407A (ja) * | 1989-08-22 | 1991-04-04 | Ohtsu Tire & Rubber Co Ltd :The | 空気入りタイヤ |
JPH0781328A (ja) * | 1993-09-13 | 1995-03-28 | Yokohama Rubber Co Ltd:The | 空気入りラジアルタイヤ |
JP2000158916A (ja) * | 1998-11-27 | 2000-06-13 | Bridgestone Corp | 空気入りタイヤ |
JP2010006155A (ja) * | 2008-06-25 | 2010-01-14 | Yokohama Rubber Co Ltd:The | 空気入りタイヤ |
WO2010147076A1 (ja) * | 2009-06-15 | 2010-12-23 | 株式会社ブリヂストン | 重荷重用タイヤ |
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GB488496A (en) * | 1937-01-05 | 1938-07-05 | Firestone Tire & Rubber Co | Improvements in or relating to tyres for vehicle wheels |
FR2463687A1 (fr) * | 1979-08-20 | 1981-02-27 | Uniroyal Englebert Pneu | Sculpture de bande de roulement pour enveloppes de pneumatique |
JPS60169305A (ja) * | 1984-02-13 | 1985-09-02 | Ohtsu Tire & Rubber Co Ltd | 車両用タイヤのトレツド構造 |
JP3122902B2 (ja) * | 1991-12-13 | 2001-01-09 | 横浜ゴム株式会社 | 空気入りタイヤ |
US7360568B2 (en) * | 2005-01-27 | 2008-04-22 | Bridgestone Firestone North American Tire, Llc | Tire having narrowing sipes |
US20070272337A1 (en) * | 2006-05-25 | 2007-11-29 | Lorie Jean Bovaird | Pneumatic tire with tread siping |
JP5438609B2 (ja) * | 2010-07-07 | 2014-03-12 | 住友ゴム工業株式会社 | 空気入りタイヤ |
CN102398478A (zh) * | 2010-09-14 | 2012-04-04 | 青岛黄海橡胶股份有限公司 | 轿车轮胎胎面 |
JP5320427B2 (ja) * | 2011-04-12 | 2013-10-23 | 住友ゴム工業株式会社 | 空気入りタイヤ |
JP5961135B2 (ja) * | 2013-04-15 | 2016-08-02 | 住友ゴム工業株式会社 | 空気入りタイヤ |
USD740208S1 (en) * | 2013-07-26 | 2015-10-06 | The Goodyear Tire & Rubber Company | Tire |
JP6607041B2 (ja) * | 2014-09-05 | 2019-11-20 | 横浜ゴム株式会社 | 空気入りタイヤ |
-
2015
- 2015-08-27 US US15/502,432 patent/US11241918B2/en active Active
- 2015-08-27 KR KR1020167028601A patent/KR101898453B1/ko active IP Right Grant
- 2015-08-27 JP JP2015562610A patent/JP6620557B2/ja not_active Expired - Fee Related
- 2015-08-27 CN CN201580046404.7A patent/CN106604833A/zh active Pending
- 2015-08-27 WO PCT/JP2015/074164 patent/WO2016035660A1/ja active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0379407A (ja) * | 1989-08-22 | 1991-04-04 | Ohtsu Tire & Rubber Co Ltd :The | 空気入りタイヤ |
JPH0781328A (ja) * | 1993-09-13 | 1995-03-28 | Yokohama Rubber Co Ltd:The | 空気入りラジアルタイヤ |
JP2000158916A (ja) * | 1998-11-27 | 2000-06-13 | Bridgestone Corp | 空気入りタイヤ |
JP2010006155A (ja) * | 2008-06-25 | 2010-01-14 | Yokohama Rubber Co Ltd:The | 空気入りタイヤ |
WO2010147076A1 (ja) * | 2009-06-15 | 2010-12-23 | 株式会社ブリヂストン | 重荷重用タイヤ |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108725100A (zh) * | 2017-04-18 | 2018-11-02 | 住友橡胶工业株式会社 | 轮胎 |
CN108725100B (zh) * | 2017-04-18 | 2022-04-15 | 住友橡胶工业株式会社 | 轮胎 |
JP2019043307A (ja) * | 2017-08-31 | 2019-03-22 | Toyo Tire株式会社 | 空気入りタイヤ |
JP6993815B2 (ja) | 2017-08-31 | 2022-01-14 | Toyo Tire株式会社 | 空気入りタイヤ |
JP2019051896A (ja) * | 2017-09-19 | 2019-04-04 | 住友ゴム工業株式会社 | タイヤ |
JP2019182407A (ja) * | 2018-04-06 | 2019-10-24 | 住友ゴム工業株式会社 | タイヤ |
JP7342400B2 (ja) | 2018-04-06 | 2023-09-12 | 住友ゴム工業株式会社 | タイヤ |
Also Published As
Publication number | Publication date |
---|---|
KR101898453B1 (ko) | 2018-09-13 |
US20170232799A1 (en) | 2017-08-17 |
US11241918B2 (en) | 2022-02-08 |
KR20160132987A (ko) | 2016-11-21 |
CN106604833A (zh) | 2017-04-26 |
JPWO2016035660A1 (ja) | 2017-06-22 |
JP6620557B2 (ja) | 2019-12-18 |
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