WO2017018019A1 - 空気入りタイヤ - Google Patents
空気入りタイヤ Download PDFInfo
- Publication number
- WO2017018019A1 WO2017018019A1 PCT/JP2016/064002 JP2016064002W WO2017018019A1 WO 2017018019 A1 WO2017018019 A1 WO 2017018019A1 JP 2016064002 W JP2016064002 W JP 2016064002W WO 2017018019 A1 WO2017018019 A1 WO 2017018019A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- land portion
- groove
- tire
- vehicle
- center
- Prior art date
Links
- 238000004891 communication Methods 0.000 claims description 9
- 230000000737 periodic effect Effects 0.000 abstract description 2
- 230000003014 reinforcing effect Effects 0.000 description 13
- 239000011324 bead Substances 0.000 description 9
- 238000013461 design Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 238000011156 evaluation Methods 0.000 description 4
- 239000004677 Nylon Substances 0.000 description 3
- 229920000297 Rayon Polymers 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229920001778 nylon Polymers 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 229920000728 polyester Polymers 0.000 description 3
- 239000002964 rayon Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
-
- 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
- B60C11/0304—Asymmetric patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/0306—Patterns comprising block rows or discontinuous ribs
-
- 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
- B60C11/0327—Tread patterns characterised by special properties of the tread pattern
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
- B60C11/1236—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
- B60C11/1236—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern
- B60C11/125—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern arranged at the groove bottom
-
- 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
-
- 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
-
- 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
- B60C2011/0353—Circumferential grooves characterised by width
-
- 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
- B60C2011/0358—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane
- B60C2011/0367—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane characterised by depth
-
- 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
- B60C11/1204—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe
- B60C2011/1213—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe sinusoidal or zigzag at the tread surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
- B60C11/1259—Depth of the sipe
- B60C2011/1268—Depth of the sipe being different from sipe to sipe
-
- 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
- B60C11/1272—Width of the sipe
- B60C2011/1286—Width of the sipe being different from sipe to sipe
Definitions
- the braking performance on the wet road surface is improved by the corrugations of the left and right groove walls of the corrugated circumferential groove.
- the rigidity of the land portion is improved in order to improve the wear resistance performance.
- the zigzag pitch and the swing width of each ridge line facing the main groove between the shoulder rib and the second rib are reduced toward the outside in the tire width direction.
- a difference in rigidity occurs between the shoulder rib and the second rib, which may reduce the wear resistance.
- the main groove has a zigzag shape, uneven wear may occur in the corner portion.
- the present invention has been made in view of the above, and an object of the present invention is to provide a pneumatic tire capable of improving the wear resistance while maintaining the braking performance on a wet road surface.
- the pneumatic tire of the present invention has four main grooves extending along the tire circumferential direction on the tread surface of the tread portion, In the pneumatic tire in which a center land portion, a middle land portion adjacent to both sides in the tire width direction of the center land portion, and a shoulder land portion adjacent to the outer side in the tire width direction of each middle land portion are formed by the groove.
- Each of the main grooves is formed in a wave shape having an amplitude periodically, and each of the land portions is provided with a plurality of lug grooves that intersect the tire circumferential direction and are arranged in the tire circumferential direction.
- the tread portion is arranged on a curved line that extends smoothly between the outer ends in the tire width direction across the land portions.
- each main groove is formed in a wave shape having an amplitude periodically, the main groove is widened as a whole, drainage is improved, and braking performance on a wet road surface is maintained. Can do.
- the drainage between the land portions can be achieved by arranging the lug grooves on the curved line continuously extending across the land portions between both outer ends in the tire width direction of the tread portion. The braking performance on a wet road surface can be maintained.
- lug grooves on the curved line that runs smoothly across the land portions between the outer ends of the tread portion in the tire width direction, an extreme rigidity difference occurs between the land portions in the tire width direction. Therefore, the wear resistance can be improved.
- a plurality of the lug grooves on the curve are provided so as to communicate with both ends of the main groove.
- the shoulder land portion is provided with a shoulder land portion narrow groove that intersects the tire circumferential direction between the lug grooves adjacent in the tire circumferential direction, and the shoulder land portion narrow groove is provided.
- the groove is provided with one end communicating with the main groove on the inner side in the tire width direction of the shoulder land portion, the other end terminating in the shoulder land portion, and adjacent to the middle land portion in the tire circumferential direction.
- a middle land portion narrow groove that intersects in the tire circumferential direction is provided between the grooves, and the middle land portion narrow groove has one end communicating with one of the main grooves in the middle land portion, and the other land portion in the middle land portion.
- each narrow groove has a wet portion with improved drainage because one end communicates with the main groove and the other end terminates in the land portion in each provided land portion. While maintaining the braking performance on the road surface, the wear resistance can be improved by suppressing the decrease in rigidity of the land.
- the middle land portion is provided with a middle land portion narrow groove that intersects the tire circumferential direction, and the middle land portion
- the narrow groove is provided such that one end thereof communicates with one of the main grooves in the middle land portion, and the other end of the middle land portion does not reach the other main groove and terminates in the middle land portion.
- the center land portion narrow groove intersecting the tire circumferential direction is provided in the portion, and the center land portion narrow groove has one end communicating with one main groove in the center land portion, and the other in the center land portion.
- the ratio between the tire width direction dimension of the land portion and the tire width direction dimension of the narrow groove increases sequentially from the inside of the vehicle to the outside of the vehicle, that is, from the inside of the vehicle to the outside of the vehicle.
- the tire width direction dimension of the narrow groove is larger than the tire width direction dimension of the portion.
- the direction inside and outside the vehicle when the vehicle is mounted is specified, and the middle intersecting the tire circumferential direction between the lug grooves adjacent to the middle land portion in the tire circumferential direction.
- the center land portion is provided with a center land portion narrow groove that intersects the tire circumferential direction between the lug grooves adjacent to each other in the tire circumferential direction, and the middle land portion on the vehicle inner side is provided.
- the shortest distance B1 of the middle land portion narrow groove with respect to the predetermined curve at the center the shortest distance B2 of the center land portion narrow groove with respect to the curve at the center land portion, and the curve with respect to the curve in the middle land portion outside the vehicle.
- the shortest distance B3 of the middle land narrow groove satisfies the relationship of B2 ⁇ B1 and B2 ⁇ B3.
- the pneumatic tire according to the present invention can improve the wear resistance performance while maintaining the braking performance on a wet road surface.
- FIG. 1 is a meridional sectional view of a pneumatic tire according to an embodiment of the present invention.
- FIG. 2 is a plan view of the tread portion of the pneumatic tire according to the embodiment of the present invention.
- FIG. 3 is an enlarged cross-sectional view of the main groove of the pneumatic tire according to the embodiment of the present invention.
- FIG. 4 is an enlarged cross-sectional view of the lug groove of the pneumatic tire according to the embodiment of the present invention.
- FIG. 5 is an enlarged cross-sectional view of a narrow groove of the pneumatic tire according to the embodiment of the present invention.
- FIG. 6 is an enlarged cross-sectional view of the lug narrow groove of the pneumatic tire according to the embodiment of the present invention.
- FIG. 7 is a chart showing the results of the performance test of the pneumatic tire according to the example of the present invention.
- FIG. 1 is a meridional sectional view of a pneumatic tire according to this embodiment.
- FIG. 2 is a plan view of the tread portion of the pneumatic tire according to the present embodiment.
- FIG. 3 is an enlarged cross-sectional view of the main groove of the pneumatic tire according to the present embodiment.
- FIG. 4 is an enlarged cross-sectional view of the lug groove of the pneumatic tire according to the present embodiment.
- FIG. 5 is an enlarged cross-sectional view of a narrow groove of the pneumatic tire according to the present embodiment.
- FIG. 6 is an enlarged cross-sectional view of the lug narrow groove of the pneumatic tire according to the present embodiment.
- the tire radial direction refers to a direction orthogonal to the rotation axis (not shown) of the pneumatic tire 1
- the tire radial direction inner side refers to the side toward the rotation axis in the tire radial direction, the tire radial direction outer side. Means the side away from the rotation axis in the tire radial direction.
- the tire circumferential direction refers to a circumferential direction with the rotation axis as the 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 in the tire width direction.
- the tire equatorial plane CL is a plane that is orthogonal to the rotation axis of the pneumatic tire 1 and passes through the center of the tire width of the pneumatic tire 1.
- the tire width is the width in the tire width direction between the portions located outside in the tire width direction, that is, the distance between the portions farthest from the tire equatorial plane CL in the tire width direction.
- the tire equator line is a line along the tire circumferential direction of the pneumatic tire 1 on the tire equator plane CL. In the present embodiment, the same sign “CL” as that of the tire equator plane is attached to the tire equator line.
- the pneumatic tire 1 is mainly used for a passenger car. As shown in FIG. 1, as shown in FIG. 1, a tread portion 2, shoulder portions 3 on both sides thereof, a side wall portion 4 and a bead successively connected from each shoulder portion 3. Part 5.
- the pneumatic tire 1 includes a carcass layer 6, a belt layer 7, and a belt reinforcing layer 8.
- the tread portion 2 is made of a rubber material (tread rubber), and is exposed at the outermost side in the tire radial direction of the pneumatic tire 1, and the outer peripheral surface thereof is the contour of the pneumatic tire 1.
- the outer peripheral surface of the tread portion 2 is a surface that can mainly come into contact with the road surface during traveling, and is configured as a tread surface 21.
- the shoulder portion 3 is a portion of the tread portion 2 on both outer sides in the tire width direction. Further, the sidewall portion 4 is exposed at the outermost side in the tire width direction of the pneumatic tire 1.
- the bead unit 5 includes a bead core 51 and a bead filler 52.
- the bead core 51 is formed by winding a bead wire, which is a steel wire, in a ring shape.
- the bead filler 52 is a rubber material disposed in a space formed by folding the end portion in the tire width direction of the carcass layer 6 at the position of the bead core 51.
- the carcass layer 6 is configured such that each tire width direction end portion is folded back from the tire width direction inner side to the tire width direction outer side by a pair of bead cores 51 and is wound around in a toroidal shape in the tire circumferential direction. It is.
- the carcass layer 6 is formed by coating a plurality of carcass cords (not shown) arranged in parallel at an angle in the tire circumferential direction with an angle with respect to the tire circumferential direction being along the tire meridian direction.
- the carcass cord is made of, for example, an organic fiber (polyester, rayon, nylon, etc.).
- the carcass layer 6 is provided as at least one layer.
- the belt layer 7 has a multilayer structure in which at least two belts 71 and 72 are laminated, and is disposed on the outer side in the tire radial direction which is the outer periphery of the carcass layer 6 in the tread portion 2 and covers the carcass layer 6 in the tire circumferential direction It is.
- the belts 71 and 72 are formed by coating a plurality of cords (not shown) arranged in parallel at a predetermined angle (for example, 20 ° to 30 °) with a coat rubber with respect to the tire circumferential direction.
- the cord is made of, for example, steel or organic fiber (polyester, rayon, nylon, etc.). Further, the overlapping belts 71 and 72 are arranged so that the cords intersect each other.
- the belt reinforcing layer 8 is disposed on the outer side in the tire radial direction which is the outer periphery of the belt layer 7 and covers the belt layer 7 in the tire circumferential direction.
- the belt reinforcing layer 8 is formed by coating a plurality of cords (not shown) arranged in parallel in the tire circumferential direction ( ⁇ 5 °) in the tire width direction with a coat rubber.
- the cord is made of, for example, steel or organic fiber (polyester, rayon, nylon, etc.).
- the belt reinforcing layer 8 shown in FIG. 1 is disposed so as to cover the end of the belt layer 7 in the tire width direction.
- the configuration of the belt reinforcing layer 8 is not limited to the above, and is not clearly shown in the figure.
- the belt reinforcing layer 8 is configured to cover the entire belt layer 7 or has two reinforcing layers, for example, on the inner side in the tire radial direction.
- the reinforcing layer is formed so as to be larger in the tire width direction than the belt layer 7 and is disposed so as to cover the entire belt layer 7, and the reinforcing layer on the outer side in the tire radial direction is disposed so as to cover only the end portion in the tire width direction of the belt layer 7.
- a configuration in which two reinforcing layers are provided and each reinforcing layer is disposed so as to cover only the end portion in the tire width direction of the belt layer 7 may be employed.
- the belt reinforcing layer 8 overlaps at least the end portion in the tire width direction of the belt layer 7.
- the belt reinforcing layer 8 is provided by winding a strip-shaped strip material (for example, a width of 10 [mm]) in the tire circumferential direction.
- the direction inside and outside the vehicle when the vehicle is mounted is designated. That is, when the pneumatic tire 1 is mounted on a vehicle, the direction with respect to the inner side and the outer side of the vehicle is specified in the tire width direction.
- the designation of the direction is not clearly shown in the figure, but is indicated by, for example, an index provided on the sidewall portion 4.
- the side facing the inside of the vehicle is the inside of the vehicle, and the side facing the outside of the vehicle is the outside of the vehicle.
- 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. Therefore, when the rim is assembled, the pneumatic tire 1 is directed to the vehicle inside and outside of the vehicle in the tire width direction.
- the direction is specified.
- the tread surface 21 of the tread portion 2 is formed with four main grooves 22 extending along the tire circumferential direction as shown in FIGS. 1 and 2. Yes.
- the main groove 22 has two center main grooves 22A provided adjacent to the center in the tire width direction so as to sandwich the tire equatorial plane CL, and shoulders provided on the outer sides in the tire width direction of the respective center main grooves 22A.
- the tread surface 21 has five land portions 23 formed by the main grooves 22.
- the land portion 23 is provided between each center main groove 22A and disposed on the tire equatorial plane CL.
- the land portion 23 is provided between each center main groove 22A and each shoulder main groove 22B.
- the middle land portions 23B adjacent to both outer sides in the tire width direction of the land portions 23A and the outer sides in the tire width direction of the respective shoulder main grooves 22B are adjacent to the outer sides in the tire width direction of the respective middle land portions 23B.
- Each shoulder land portion 23 ⁇ / b> C disposed on the outermost side in the tire width direction of the portion 2.
- Each main groove 22 (22A, 22B) is formed in a wave shape having a groove width W1 constant in the tire circumferential direction and periodically having an amplitude.
- the wave shape of each main groove 22 has a periodic amplitude such that the groove bottom 22a shown in FIG. 3 is linear along the tire circumferential direction and the groove wall 22b has a constant groove width W1 in the tire circumferential direction. Can be obtained.
- the wave shape of each main groove 22 can also be obtained by having the groove bottom 22a and the groove wall 22b shown in FIG. 3 periodically have an amplitude so that the groove width W1 is constant in the tire circumferential direction.
- each main groove 22 has a chamfer 22c formed at the opening edge as shown in FIG.
- the groove width W1 of the main groove 22 is a width that opens to the tread surface 21, and in the main groove 22 in which the chamfer 22c is formed, the space between the outer edges of the chamfer 22c is the groove width W1.
- the main groove 22 has a groove width W1 of 5 mm or more and 12 mm or less for the center main groove 22A, a groove depth D1 of 4 mm or more and 8 mm or less, and a groove width W1 of 3 mm or more for the shoulder main groove 22B. 6 mm or less and the groove depth D1 is 4 mm or more and 8 mm or less.
- the groove width W1 is such that the center main groove 22A is larger than the shoulder main groove 22B.
- the shoulder main groove 22B is within a range of 10% to 50% with respect to the groove width W1 of the center main groove 22A. It is preferable for maintaining the drainability in the main groove 22A and securing the rigidity of the land portion 23 around the shoulder main groove 22B.
- the main groove 22 has a center line 22d with a center line 22d whose amplitude is within the range of 20% to 30% of the ground contact width TW from the tire equatorial plane CL to the outer side in the tire width direction.
- the center line 22d of the amplitude of the shoulder main groove 22B is disposed at a distance L2 in the range of 60% to 70% of the ground contact width TW from the tire equatorial plane CL to the outer side in the tire width direction. It is preferable to maintain the drainability in the center main groove 22A and to secure the rigidity of the land portion 23 around the shoulder main groove 22B. And the edge shape of the tire width direction of each land part 23 and a tire width direction dimension are determined with the amplitude of the said main groove 22, and the position of a tire width direction.
- the contact width TW is the width in the tire width direction of the contact area. Further, both outermost ends in the tire width direction of the ground contact area are referred to as ground contact ends T.
- the ground contact end T is shown continuously in the tire circumferential direction.
- the ground contact area is a flat surface in which the tread surface 21 of the tread portion 2 of the pneumatic tire 1 is dried when the pneumatic tire 1 is assembled on a regular rim and filled with a regular internal pressure and 70% of the regular load is applied. This is an area where it touches the ground.
- 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 pneumatic tire 1 of the present embodiment has a groove width narrower than the main groove 22 having the smallest groove width W1 in the middle land portion 23B inside the vehicle, and extends in a straight line along the tire circumferential direction.
- a groove 24 is provided.
- the auxiliary groove 24 is provided in the center between the center main groove 22A and the shoulder main groove 22B forming the middle land portion 23B on the vehicle inner side, and the middle land portion 23B on the vehicle inner side is formed in a rib land portion aligned in the tire width direction.
- the auxiliary groove 24 has a groove width of 1 mm or more and less than 3 mm, and a groove depth of 4 mm or more and 8 mm or less.
- each land portion 23 is provided with a lug groove 25 and a narrow groove 26 that intersect with the tire circumferential direction.
- the lug groove 25 provided in the center land portion 23A is a center land portion lug groove 25A
- the lug groove 25 provided in each middle land portion 23B is a middle land portion lug groove 25B
- the lug provided in the shoulder land portion 23C is a shoulder land lug groove 25C.
- the narrow groove 26 provided in the center land portion 23A is a center land portion thin groove 26A
- the narrow groove 26 provided in each middle land portion 23B is a middle land portion thin groove 26B
- the narrow groove provided in the shoulder land portion 23C. 26 is a shoulder land narrow groove 26C.
- the narrow groove 26 that communicates with the terminal end of the lug groove 25 and that communicates with the main groove 22 and the auxiliary groove 24 is referred to as a communication thin groove 26E.
- the pneumatic tire 1 of the present embodiment is provided with the lug narrow grooves 27 in which the lug grooves 25 and the narrow grooves 26 are mixed while the lug grooves 25 and the narrow grooves 26 communicate with each other.
- the lug groove 25 is formed by a chamfer 25 c with a groove wall 25 b extending from an opening on the tread surface 21 to a groove bottom 25 a.
- the lug groove 25 has a groove width W2 of 2 mm or more and 4 mm or less, a groove depth D2 of 2 mm or more and 6 mm or less, and is shallower than the main groove 22 and the auxiliary groove 24.
- the narrow groove 26 is formed with a groove wall 26b extending from the opening on the tread surface 21 to the groove bottom 26a along the tire radial direction.
- the narrow groove 26 has a groove width W3 of 0.4 mm or more and 1.0 mm or less, a groove depth D3 of 3 mm or more and 6 mm or less, and is shallower than the main groove 22 and the auxiliary groove 24.
- the lug narrow groove 27 is formed by forming a narrow groove 26 along the extending direction of the lug groove 25 on the groove bottom 25 a of the lug groove 25.
- the total groove depth including the depth D2 and the groove depth D3 of the narrow groove 26 is 6 mm or less, which is shallower than the main groove 22 and the auxiliary groove 24.
- the groove depth D3 of the narrow groove 26 of the lug narrow groove 27 is 70% or more with respect to the total groove depth (D2 + D3) including the lug groove 25 in the lug narrow groove 27.
- the center land part lug groove 25A provided in the center land part 23A is provided in plural in the tire circumferential direction with each end communicating with each center main groove 22A forming the center land part 23A.
- the center land portion 23A is divided into a plurality of block land portions arranged in the tire circumferential direction.
- the center land portion lug groove 25A is configured as a lug narrow groove 27 in which the lug groove 25 and the narrow groove 26 are mixed.
- the middle land portion lug groove 25B provided in the middle land portion 23B on the vehicle outer side is connected to the center main groove 22A and the shoulder main groove 22B that form the middle land portion 23B on the vehicle outer side, and a plurality of them are provided in the tire circumferential direction.
- the middle land portion 23 ⁇ / b> B outside the vehicle is divided into a plurality of block land portions arranged in the tire circumferential direction.
- the middle land portion lug groove 25B provided in the middle land portion 23B outside the vehicle communicates with the shoulder main groove 22B that forms the middle land portion 23B outside the vehicle, and terminates there.
- the middle land portion lug groove 25B provided in the middle land portion 23B outside the vehicle is configured as a lug narrow groove 27 in which the lug groove 25 and the narrow groove 26 are mixed.
- the middle land portion lug groove 25B provided in the middle land portion 23B inside the vehicle has one end communicating with the center main groove 22A forming the middle land portion 23B inside the vehicle, and the other end does not reach the auxiliary groove 24 and is inside the vehicle.
- the middle land portion 23B inside the vehicle is configured as a rib-like land portion.
- the middle land portion lug groove 25B provided in the middle land portion 23B inside the vehicle is configured as a lug narrow groove 27 in which the end portion is a mixture of the lug groove 25 and the narrow groove 26.
- a communicating narrow groove 26 ⁇ / b> E extends from the narrow groove 26 of the groove 27 and communicates with the auxiliary groove 24.
- the middle land portion lug groove 25B provided in the middle land portion 23B outside the vehicle and the center land portion lug groove 25A provided in the center land portion 23A are the middle land portion 23B and the center land portion outside the vehicle. Both ends of the center main groove 22A with respect to 23A face each other, and are provided so as to penetrate the center main groove 22A integrally with each other in a plan view. Further, the center land portion lug groove 25A provided in the center land portion 23A and the middle land portion lug groove 25B provided in the middle land portion 23B inside the vehicle are divided into the center land portion 23A and the middle land portion 23B inside the vehicle.
- the center main grooves 22A between the two are opposed to each other, and are provided so as to penetrate the center main groove 22A integrally with each other in a plan view. Accordingly, the middle land portion lug groove 25B provided in the middle land portion 23B outside the vehicle, the center land portion lug groove 25A provided in the center land portion 23A, and the middle land portion provided in the middle land portion 23B inside the vehicle.
- the partial lug groove 25B is configured as a through lug groove 25E that integrally penetrates each center main groove 22A. That is, the through lug groove 25E intersects with the tire circumferential direction and continuously penetrates the center land portion 23A and the vehicle outer middle land portion 23B to be provided in the tire circumferential direction, and the vehicle outer middle land portion 23B.
- One end is opened in the shoulder main groove 22B on the vehicle outer side of the vehicle, passes through the center main groove 22A on the vehicle inner side of the center land portion 23A, and terminates in the middle land portion 23B on the vehicle inner side without reaching the auxiliary groove 24. Is provided.
- Each shoulder land portion lug groove 25C provided in each shoulder land portion 23C intersects with the tire circumferential direction and is arranged in a plurality in the tire circumferential direction.
- the shoulder land portion lug groove 25C has one end opened at a design end E that is an outer end in the tire width direction of the tread surface 21 of the tread portion 2, and the other end is a shoulder main portion on the inner side in the tire width direction of each shoulder land portion 23C. It does not reach the groove 22B and is provided to terminate in the shoulder land portion 23C. Accordingly, each shoulder land portion 23C is configured as a rib-like land portion.
- the shoulder land portion lug groove 25C provided in each shoulder land portion 23C is configured as a lug narrow groove 27 in which the end portion is a mixture of the lug groove 25 and the narrow groove 26.
- a communicating narrow groove 26E extends from the narrow groove 26 and communicates with the shoulder main groove 22B.
- the terminal end portion configured as the lug narrow groove 27 in the shoulder land portion lug groove 25 ⁇ / b> C is provided on the ground contact end T.
- the design end E refers to the outermost end in the tire width direction of the tread portion 2 on the outer side in the tire width direction of the ground contact end T, and is the outermost end in the tire width direction in which a groove is formed in the tread portion 2.
- the design end E is shown continuously in the tire circumferential direction. That is, in the tread portion 2, on the dry flat road surface, the area closer to the design end E than the ground end T is an area that does not contact the normal road surface.
- each shoulder land part lug groove 25C provided in each shoulder land part 23C is provided to terminate in the shoulder land part 23C, and is provided separately from the above-described through lug groove 25E.
- the shoulder land portion lug groove 25C provided in the shoulder land portion 23C on the outside of the vehicle is an end of the end portion terminated in the shoulder land portion 23C and is one end of the through lug groove 25E.
- the shoulder land lug groove 25C provided in the shoulder land portion 23C on the vehicle inner side is the other end of the through lug groove 25E on the extension of the end portion terminated in the shoulder land portion 23C, and the middle on the vehicle inner side.
- each lug groove 25B is formed between the land portions 23A, between the outer ends (design end E) of the tread portion 2 in the tire width direction. It is arranged on the curved line CU smoothly extending across 23B and 23C. Curve CU refers to an angle with respect to the tire width direction at a tangent of each part that is 40 ° or more and 90 ° or less.
- the center land portion narrow groove 26A provided in the center land portion 23A is provided so as to intersect the tire circumferential direction between the center land portion lug grooves 25A adjacent in the tire circumferential direction.
- the center land portion narrow groove 26A has one end communicating with the center main groove 22A inside the vehicle in the center land portion 23A, and the other end does not reach the center main groove 22A outside the vehicle in the center land portion 23A. It is provided with termination.
- the middle land portion narrow groove 26B provided in the middle land portion 23B outside the vehicle is provided so as to intersect the tire circumferential direction between the middle land portion lug grooves 25B adjacent in the tire circumferential direction.
- the middle land portion narrow groove 26B is provided such that one end thereof communicates with the center main groove 22A in the middle land portion 23B, and the other end does not reach the shoulder main groove 22B in the middle land portion 23B and terminates in the middle land portion 23B. Yes.
- the middle land portion narrow groove 26B provided in the middle land portion 23B on the inner side of the vehicle is provided so as to intersect the tire circumferential direction between the extension of the middle land portion lug groove 25B adjacent in the tire circumferential direction. .
- the middle land portion narrow groove 26B is provided with each end communicating with the shoulder main groove 22B and the auxiliary groove 24 in the middle land portion 23B. Therefore, the middle land portion narrow groove 26B provided in the middle land portion 23B on the vehicle inner side is a block land portion in which a part of the middle land portion 23B between the shoulder main groove 22B and the auxiliary groove 24 is arranged in the tire circumferential direction.
- Each shoulder land portion narrow groove 26C provided in each shoulder land portion 23C is provided so as to intersect the tire circumferential direction between the shoulder land portion lug grooves 25C adjacent in the tire circumferential direction.
- the shoulder land portion narrow groove 26C communicates with the shoulder main groove 22B at one end, extends beyond the ground contact end T, and closes to the shoulder land portion in the vicinity of both outer ends (design end E) of the tread portion 2 in the tire width direction. It is provided to terminate in 23C.
- Each shoulder land portion 23C is provided with a recess 28 in the vicinity of both outer ends (design end E) of the tread portion 2 in the tire width direction.
- the recesses 28 are formed in a circular dimple shape, and there are two rows in the tire width direction and two tire width direction inner rows 28a in the tire circumferential direction between the shoulder land lug grooves 25C adjacent in the tire circumferential direction.
- Three tire width direction outer rows 28b are formed in the tire circumferential direction.
- the recessed part 28 is formed in the tire width direction outer side row
- Each shoulder land portion narrow groove 26 ⁇ / b> C provided in each shoulder land portion 23 ⁇ / b> C is provided with the other end terminated at the recess 28.
- the shoulder land portion narrow groove 26C is provided to terminate at the center recess portion 28 in the tire circumferential direction of the tire width direction outer row 28b.
- the pneumatic tire 1 of the present embodiment has the four main grooves 22 extending along the tire circumferential direction on the tread surface 21 of the tread portion 2.
- a portion 23A, a middle land portion 23B adjacent to both sides in the tire width direction of the center land portion 23A, and a shoulder land portion 23C adjacent to the outer side in the tire width direction of each middle land portion 23B are formed.
- Each main groove 22 is formed in a wave shape having an amplitude periodically, and a plurality of lug grooves 25 arranged in the tire circumferential direction so as to intersect the tire circumferential direction are provided in each land portion 23A, 23B, 23C.
- the lug groove 25 is arranged on a curved line CU smoothly extending across the land portions 23A, 23B, and 23C between both outer ends of the tread portion 2 in the tire width direction.
- each main groove 22 is formed in a wave shape having an amplitude periodically, the main groove 22 is widened as a whole, the drainage performance is improved, and the braking performance on a wet road surface is improved. Can be maintained.
- the lug groove 25 is arranged on the curved line CU smoothly extending across the land portions 23A, 23B, and 23C between both outer ends of the tread portion 2 in the tire width direction. Moreover, the drainage performance between the land portions 23A, 23B, and 23C is improved, and the braking performance on the wet road surface can be maintained.
- each land portion 23A in the tire width direction. , 23B, 23C the wear resistance can be improved.
- a plurality of lug grooves 25 on the curve CU are provided with both ends communicating with the main groove 22.
- the pneumatic tire 1 it is possible to improve the drainage performance between the land portions 23A, 23B, and 23C and improve the braking performance on the wet road surface.
- the direction inside and outside the vehicle when the vehicle is mounted is specified, and the lug groove 25 continuously penetrates the center land portion 23A and the middle land portion 23B outside the vehicle.
- a plurality of through lug grooves 25E are provided in the tire circumferential direction.
- the through lug grooves 25E open at one end to the shoulder main groove 22B on the vehicle outer side in the middle land portion 23B on the vehicle outer side, and the vehicle inner side of the center land portion 23A. It is preferable that the other end is provided in the middle land portion 23B inside the vehicle through the center main groove 22A.
- the center main groove 22A and the shoulder main groove 22B on the vehicle outer side are formed by the through lug grooves 25E provided continuously through the center land portion 23A and the middle land portion 23B on the vehicle outer side. Can improve the drainage and improve the braking performance on wet road surfaces.
- the through lug groove 25E is provided to terminate in the middle land portion 23B inside the vehicle, it is possible to improve the wear resistance performance by suppressing the rigidity of the middle land portion 23B inside the vehicle.
- each shoulder land portion 23C is provided with a shoulder land portion narrow groove 26C that intersects the tire circumferential direction between the shoulder land portion lug grooves 25C adjacent in the tire circumferential direction.
- the shoulder land portion narrow groove 26C is provided with one end communicating with the shoulder main groove 22B on the inner side in the tire width direction of the shoulder land portion 23C and the other end terminating in the shoulder land portion 23C.
- 23B is provided with a middle land portion narrow groove 26B that intersects in the tire circumferential direction between middle land portion lug grooves 25B adjacent in the tire circumferential direction, and the middle land portion narrow groove 26B is one of the middle land portion narrow grooves 26B.
- One end communicates with the main groove 22 (the center main groove 22A or the shoulder main groove 22B), and the other main groove 22 (the shoulder main groove 22B or the center main groove 22B) in the middle land portion 23B.
- the center land portion narrow groove 26A is provided, one end of the center land portion narrow groove 26A communicates with one center main groove 22A in the center land portion 23A, and the other center main groove 22A in the center land portion 23A. It is preferable that the end is not provided and the end is provided in the center land portion 23A.
- each of the narrow grooves 26A, 26B, and 26C has a land portion 23A, 23B, and 23C provided with one end communicating with the main groove 22 and the other end being the land portions 23A and 23B. , 23C, it is possible to improve wear resistance by improving the drainage and maintaining the braking performance on wet road surfaces while suppressing the decrease in rigidity of the land portions 23A, 23B, 23C. it can.
- each middle land portion 23B is provided with a middle land portion narrow groove 26B that intersects the tire circumferential direction
- the middle land portion narrow groove 26B has one end communicating with one main groove 22 (center main groove 22A or shoulder main groove 22B) in the middle land portion 23B, and the other main groove 22 (shoulder main groove) in the middle land portion 23B. 22B or the center main groove 22A), the other end does not reach the middle land portion 23B, and the center land portion 23A is provided with a center land portion narrow groove 26A that intersects the tire circumferential direction.
- the narrow groove 26A has one end communicating with one center main groove 22A in the center land portion 23A and the other end leading to the other center main groove 22A in the center land portion 23A.
- the center land portion 23A is terminated and provided in the tire width direction dimension RW1 of the middle land portion 23B inside the vehicle, and the tire width of the middle land portion narrow groove 26B provided in the middle land portion 23B inside the vehicle.
- the ratio A3 between the tire width direction dimension RW3 of the middle land portion 23B and the tire width direction dimension GW3 of the middle land portion narrow groove 26B provided in the middle land portion 23B outside the vehicle has a relationship of A1 ⁇ A2 ⁇ A3. It is preferable to satisfy.
- the ratio between the tire width direction dimension of the land portion 23 and the tire width direction dimension of the narrow groove 26 increases sequentially from the vehicle inner side to the vehicle outer side, that is, from the vehicle inner side to the vehicle outer side.
- the tire width direction dimension of the narrow groove 26 is larger than the tire width direction dimension of the land portion 23.
- the direction inside and outside the vehicle when the vehicle is mounted is specified, and the tire is between the middle land portion 23B and the middle land portion lug groove 25B adjacent in the tire circumferential direction.
- a middle land portion narrow groove 26B that intersects in the circumferential direction is provided, and a center land portion narrow groove 26A that intersects in the tire circumferential direction is provided between the center land portion lug grooves 25A adjacent to each other in the tire circumferential direction.
- the pneumatic tire 1 of the present embodiment has four main grooves 22 extending along the tire circumferential direction on the tread surface 21 of the tread portion 2, and the center land portion 23 ⁇ / b> A is formed by each main groove 22.
- the groove 22 is formed in a wave shape having a constant groove width in the tire circumferential direction and periodically having an amplitude.
- the direction inside and outside the vehicle when the vehicle is mounted may not be specified.
- each main groove 22 is formed in a wave shape having an amplitude periodically, the main groove 22 is widened as a whole, the drainage performance is improved, and the braking performance on a wet road surface is improved. Can be maintained.
- each main groove 22 has a constant groove width in the tire circumferential direction. Therefore, the rigidity of the land portion 23 formed by each main groove 22 in the vicinity of the main groove 22 is increased. Since it is made uniform, the wear resistance can be improved.
- the direction inside and outside the vehicle when the vehicle is mounted is specified, and the middle land portion 23B inside the vehicle has a groove width narrower than each main groove 22 in the tire circumferential direction. It is preferable to provide an auxiliary groove 24 extending linearly along.
- the inner side of the vehicle has a high contribution to drainage
- the middle land portion 23B on the inner side of the vehicle is provided with the auxiliary grooves 24 that extend linearly along the tire circumferential direction, so that the drainage performance is achieved.
- the braking performance on wet road surfaces can be improved.
- the auxiliary groove 24 has a narrower groove width than each main groove 22, it is possible to suppress wear reduction of the middle land portion 23B and improve wear resistance.
- a plurality of through lug grooves that intersect with the tire circumferential direction and continuously penetrate the center land portion 23A and the middle land portion 23B outside the vehicle and are provided in the tire circumferential direction.
- one end of the through lug groove 25E is opened in the shoulder main groove 22B on the vehicle outer side in the middle land portion 23B on the vehicle outer side, and passes through the center main groove 22A on the vehicle inner side of the center land portion 23A to enter the vehicle inner side. It is preferable that the other end of the middle land portion 23B is provided so as not to reach the auxiliary groove 24.
- the center main groove 22A and the shoulder main groove 22B on the vehicle outer side are formed by the through lug grooves 25E provided continuously through the center land portion 23A and the middle land portion 23B on the vehicle outer side.
- the through lug groove 25E does not reach the auxiliary groove 24 and is terminated and provided in the middle land portion 23B on the vehicle inner side, it suppresses a decrease in rigidity of the middle land portion 23B on the inner side of the vehicle, thereby improving wear resistance performance. Can be improved.
- each shoulder land portion 23C is provided with a plurality of shoulder land portion lug grooves 25C that intersect with the tire circumferential direction and are arranged in the tire circumferential direction. Is preferably provided so as not to reach the shoulder main groove 22B on the inner side in the tire width direction of the shoulder land portion 23C.
- the shoulder land portion 23C can be drained by the shoulder land portion lug groove 25C, and the rigidity of the shoulder land portion 23C is suppressed by the termination in the shoulder land portion 23C. Abrasion resistance can be improved.
- the shoulder land portion lug groove 25C communicates with the shoulder main groove 22B on the inner side in the tire width direction of the shoulder land portion 23C via the communication narrow groove 26E having a narrower groove width than itself. It is preferable that
- the drainage performance is improved by the communication narrow groove 26E, and the braking performance on a wet road surface can be improved.
- the communication narrow groove 26E has a narrower groove width than the shoulder land portion lug groove 25C, it is possible to suppress wear reduction of the shoulder land portion 23C and improve wear resistance.
- the lug narrow groove 27 in which the lug groove 25 and the narrow groove 26 are mixed is interposed between the shoulder land portion lug groove 25C and the communication narrow groove 26E. .
- the lug narrow groove 27 is interposed between the shoulder land lug groove 25C and the communication narrow groove 26E, so that the shoulder land lug groove 25C and the communication narrow groove 26E are communicated with each other.
- the extreme change in rigidity can be suppressed, and the wear resistance performance can be improved.
- the shoulder land having a narrower width than the shoulder land portion lug groove 25C intersects with the tire circumferential direction between the shoulder land portion lug grooves 25C adjacent in the tire circumferential direction. It is preferable that a partial narrow groove 26C is provided.
- the shoulder land portion narrow groove 26C can improve drainage and improve braking performance on a wet road surface.
- the shoulder land portion narrow groove 26C has a narrower groove width than the shoulder land portion lug groove 25C, it is possible to suppress wear reduction of the shoulder land portion 23C and improve wear resistance.
- the shoulder land portion 23C has a recess 28 formed at the outer end in the tire width direction, and the shoulder land portion narrow groove 26C has an end at the outer side in the tire width direction at the recess 28. It is preferable that the terminal is provided.
- the end of the shoulder land portion narrow groove 26 ⁇ / b> C on the outer side in the tire width direction is terminated by the recess 28, so that a load is applied to the end portion of the shoulder land portion narrow groove 26 ⁇ / b> C on the outer side in the tire width direction.
- the opening of the lug groove 25 is formed by the chamfer 25c.
- this pneumatic tire 1 by forming the opening of the lug groove 25 with the chamfer 25c, it is possible to suppress wear reduction of the land portion in the vicinity of the lug groove 25 and to improve wear resistance. .
- the inside / outside direction when the vehicle is mounted is specified, and the middle land portion narrow groove 26B that intersects the tire circumferential direction is provided in the middle land portion 23B outside the vehicle.
- the middle land portion narrow groove 26B has one end communicating with the center main groove 22A inside the vehicle in the middle land portion 23B, and the other end does not reach the shoulder main groove 22B outside the vehicle in the middle land portion 23B.
- the center land portion 23A is provided with a center land portion narrow groove 26A that intersects in the tire circumferential direction, and the center land portion narrow groove 26A is located in the center land portion 23A.
- One end communicates with the groove 22A, and the other end does not reach the center main groove 22A on the vehicle outer side in the center land portion 23A and is terminated in the center land portion 23A. It is preferred.
- the middle land portion narrow groove 26B and the center land portion narrow groove 26A can improve drainage and improve braking performance on a wet road surface.
- the middle land portion narrow groove 26B and the center land portion narrow groove 26A are terminated in the land portions 23B and 23A, respectively, the rigidity of the land portions 23B and 23A is suppressed and the wear resistance performance is improved. can do.
- the tread portion 2 is configured in an asymmetric pattern in the tire width direction, and the difference in the groove area ratio on the outer side in both tire width directions across the tire equatorial plane CL is 2. % Is preferable.
- the groove area ratio is defined as a percentage of groove area / (groove area + ground contact area).
- the groove area is the sum of the opening areas of all the grooves on the ground contact surface (ground contact region). Further, the groove area and the contact area are measured when the pneumatic tire 1 is assembled to a normal rim, filled with a normal internal pressure, and 70% of the normal load is applied.
- the rigidity and drainage of the land portions on both outer sides in the tire width direction across the tire equatorial plane CL are made uniform, and the wear resistance performance is improved while maintaining the braking performance on the wet road surface.
- the effect can be obtained remarkably.
- the groove area ratio is preferably higher on the vehicle inner side that contributes to drainage.
- each shoulder land portion 23C has a recess 28 formed at the outer end in the tire width direction, and the recess 28 has two rows in the tire width direction and an inner row 28a in the tire width direction.
- 2 in the tire circumferential direction and three outer row 28b in the tire width direction are formed in the tire circumferential direction, and the outer row 28b in the tire width direction is formed to have a larger diameter than the inner row 28a in the tire width direction.
- the appearance of the outer end in the tire width direction of the tread portion 2 can be improved by the recess 28.
- the portion where the concave portion 28 is formed is a portion that is outside the ground contact end T in the tire width direction and is not normally grounded on the dry road surface, and does not affect the running of the vehicle.
- a pneumatic tire with a tire size of 205 / 55R16 is assembled to a regular rim of 16 ⁇ 6.5J, filled with a regular internal pressure (200 kPa), and a test vehicle (1600cc front engine front drive sedan type passenger vehicle) Attached to.
- Wear resistance performance is evaluated by measuring the amount of wear on each land portion based on the remaining groove amount after running 5000 km on a dry road test course using the test vehicle. Then, based on this measurement result, index evaluation using the conventional example as a reference (100) is performed. In this evaluation, the larger the value, the less the wear and the better.
- 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. Then, based on this measurement result, index evaluation using the conventional example as a reference (100) is performed. In this evaluation, the larger the numerical value, the shorter the braking distance is preferable.
- a pneumatic tire as a test tire has four main grooves formed on a tread surface, five land portions, and the land portion is a center land portion disposed on the tire equator surface.
- the middle land portion is disposed adjacent to both outer sides in the tire width direction of the center land portion, and the shoulder land portion is disposed adjacent to the outer side in the tire width direction of each middle land portion.
- the main groove has a wave-like amplitude.
- the lug grooves of each land portion are arranged so as to deviate from the curved line continuously extending across the land portions between both outer ends of the tread portion in the tire width direction.
- the main groove has a wave-like amplitude.
- the lug grooves of each land part are arranged on a curve that is smoothly connected across the land parts between both outer ends in the tire width direction of the tread part. Yes.
- the groove width of the main groove is constant.
- a plurality of lug grooves on the curve are provided with both ends communicating with the main groove.
- the pneumatic tires of Examples 3 to 7 have a through lug groove in which a direction inside and outside the vehicle is specified when the vehicle is mounted.
- the pneumatic tires of Examples 4 to 7 are provided with one end of the shoulder land portion narrow groove of the shoulder land portion connected to the main groove and the other end terminated in the shoulder land portion, and the middle land portion of the middle land portion.
- One end of the narrow groove communicates with one main groove and the other end terminates in the middle land portion
- one end of the center land portion narrow groove of the center land portion communicates with one main groove and the other end within the center land portion. It is provided with a terminal.
- the relationship between the land portion and the narrow groove in the tire width direction is A1 ⁇ A2 ⁇ A3.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Abstract
Description
2 トレッド部
21 トレッド面
22 主溝
22A センター主溝
22B ショルダー主溝
23 陸部
23A センター陸部
23B ミドル陸部
23C ショルダー陸部
25 ラグ溝
25A センター陸部ラグ溝
25B ミドル陸部ラグ溝
25C ショルダー陸部ラグ溝
25E 貫通ラグ溝
25c 面取
26 細溝
26A センター陸部細溝
26B ミドル陸部細溝
26C ショルダー陸部細溝
27 ラグ細溝
CU 曲線
Claims (6)
- トレッド部のトレッド面に、タイヤ周方向に沿って延在する4本の主溝を有し、各前記主溝により、センター陸部と、前記センター陸部のタイヤ幅方向両側に隣接するミドル陸部と、各前記ミドル陸部のタイヤ幅方向外側に隣接するショルダー陸部とが形成される空気入りタイヤにおいて、
各前記主溝は、周期的に振幅を有する波状に形成されており、
各前記陸部に、タイヤ周方向に交差してタイヤ周方向に複数並ぶラグ溝が設けられ、
各前記ラグ溝は、前記トレッド部のタイヤ幅方向の両外側端間で各前記陸部を跨いで滑らかに連なる曲線上に配置されていることを特徴とする空気入りタイヤ。 - 前記曲線上の各前記ラグ溝は、複数が前記主溝に両端を連通して設けられていることを特徴とする請求項1に記載の空気入りタイヤ。
- 車両装着時での車両内外の向きが指定されており、
前記ラグ溝は、前記センター陸部および車両外側の前記ミドル陸部を連続して貫通しタイヤ周方向に複数設けられた貫通ラグ溝を有し、
前記貫通ラグ溝は、車両外側の前記ミドル陸部における車両外側の前記主溝に一端が開口し、前記センター陸部の車両内側の前記主溝を貫通して車両内側の前記ミドル陸部内で他端が終端して設けられていることを特徴とする請求項1または2に記載の空気入りタイヤ。 - 前記ショルダー陸部に、タイヤ周方向で隣接する前記ラグ溝の間にタイヤ周方向に対して交差するショルダー陸部細溝が設けられ、当該ショルダー陸部細溝は、前記ショルダー陸部におけるタイヤ幅方向内側の前記主溝に一端が連通し、他端が前記ショルダー陸部内で終端して設けられ、
前記ミドル陸部に、タイヤ周方向で隣接する前記ラグ溝の間にタイヤ周方向に交差するミドル陸部細溝が設けられ、当該ミドル陸部細溝は、前記ミドル陸部における一方の前記主溝に一端が連通し、前記ミドル陸部における他方の前記主溝に他端が至らず前記ミドル陸部内で終端して設けられ、
前記センター陸部に、タイヤ周方向で隣接する前記ラグ溝の間にタイヤ周方向に交差するセンター陸部細溝が設けられ、当該センター陸部細溝は、前記センター陸部における一方の前記主溝に一端が連通し、前記センター陸部における他方の前記主溝に他端が至らず前記センター陸部内で終端して設けられていることを特徴とする請求項1~3のいずれか1つに記載の空気入りタイヤ。 - 車両装着時での車両内外の向きが指定されており、
前記ミドル陸部に、タイヤ周方向に交差するミドル陸部細溝が設けられ、当該ミドル陸部細溝は、前記ミドル陸部における一方の前記主溝に一端が連通し、前記ミドル陸部における他方の前記主溝に他端が至らず前記ミドル陸部内で終端して設けられ、
前記センター陸部に、タイヤ周方向に交差するセンター陸部細溝が設けられ、当該センター陸部細溝は、前記センター陸部における一方の前記主溝に一端が連通し、前記センター陸部における他方の前記主溝に他端が至らず前記センター陸部内で終端して設けられており、
車両内側の前記ミドル陸部のタイヤ幅方向寸法と、車両内側の前記ミドル陸部に設けられた前記ミドル陸部細溝のタイヤ幅方向寸法との比率A1と、
前記センター陸部のタイヤ幅方向寸法と、前記センター陸部に設けられた前記センター陸部細溝のタイヤ幅方向寸法との比率A2と、
車両外側の前記ミドル陸部のタイヤ幅方向寸法と、車両外側の前記ミドル陸部に設けられた前記ミドル陸部細溝のタイヤ幅方向寸法との比率A3と、
が、A1<A2<A3の関係を満たすことを特徴とする請求項1~4のいずれか1つに記載の空気入りタイヤ。 - 車両装着時での車両内外の向きが指定されており、
前記ミドル陸部に、タイヤ周方向で隣接する前記ラグ溝の間にタイヤ周方向に交差するミドル陸部細溝が設けられ、
前記センター陸部に、タイヤ周方向で隣接する前記ラグ溝の間にタイヤ周方向に交差するセンター陸部細溝が設けられており、
車両内側の前記ミドル陸部における所定の前記曲線に対する前記ミドル陸部細溝の最短距離B1と、
前記センター陸部における前記曲線に対する前記センター陸部細溝の最短距離B2と、
車両外側の前記ミドル陸部における前記曲線に対する前記ミドル陸部細溝の最短距離B3と、
が、B2<B1、かつB2<B3の関係を満たすことを特徴とする請求項1~5のいずれか1つに記載の空気入りタイヤ。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112016003406.7T DE112016003406T5 (de) | 2015-07-27 | 2016-05-11 | Luftreifen |
US15/745,421 US10828939B2 (en) | 2015-07-27 | 2016-05-11 | Pneumatic tire |
CN201680041438.1A CN107848340B (zh) | 2015-07-27 | 2016-05-11 | 充气轮胎 |
KR1020177025248A KR101947392B1 (ko) | 2015-07-27 | 2016-05-11 | 공기입 타이어 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2015-147930 | 2015-07-27 | ||
JP2015147930A JP2017024658A (ja) | 2015-07-27 | 2015-07-27 | 空気入りタイヤ |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2017018019A1 true WO2017018019A1 (ja) | 2017-02-02 |
Family
ID=57885381
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2016/064002 WO2017018019A1 (ja) | 2015-07-27 | 2016-05-11 | 空気入りタイヤ |
Country Status (6)
Country | Link |
---|---|
US (1) | US10828939B2 (ja) |
JP (1) | JP2017024658A (ja) |
KR (1) | KR101947392B1 (ja) |
CN (1) | CN107848340B (ja) |
DE (1) | DE112016003406T5 (ja) |
WO (1) | WO2017018019A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018016302A1 (ja) * | 2016-07-19 | 2018-01-25 | 横浜ゴム株式会社 | 空気入りタイヤ |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11034190B2 (en) * | 2017-06-06 | 2021-06-15 | The Yokohama Rubber Co., Ltd. | Pneumatic tire |
JP6943155B2 (ja) * | 2017-11-27 | 2021-09-29 | 住友ゴム工業株式会社 | タイヤ |
JP7131111B2 (ja) * | 2018-06-19 | 2022-09-06 | 横浜ゴム株式会社 | 空気入りタイヤ |
JP7502660B2 (ja) * | 2019-06-14 | 2024-06-19 | 横浜ゴム株式会社 | タイヤ |
WO2022118638A1 (ja) * | 2020-12-02 | 2022-06-09 | 横浜ゴム株式会社 | タイヤ |
JP7688259B2 (ja) * | 2020-12-02 | 2025-06-04 | 横浜ゴム株式会社 | タイヤ |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004203322A (ja) * | 2002-12-26 | 2004-07-22 | Bridgestone Corp | 空気入りタイヤ |
JP2009096398A (ja) * | 2007-10-18 | 2009-05-07 | Bridgestone Corp | 空気入りタイヤ |
JP2012218652A (ja) * | 2011-04-12 | 2012-11-12 | Sumitomo Rubber Ind Ltd | 空気入りタイヤ |
JP2013147141A (ja) * | 2012-01-19 | 2013-08-01 | Bridgestone Corp | タイヤ |
JP2013220780A (ja) * | 2012-04-18 | 2013-10-28 | Yokohama Rubber Co Ltd:The | 空気入りタイヤ |
WO2015012160A1 (ja) * | 2013-07-24 | 2015-01-29 | 横浜ゴム株式会社 | 空気入りタイヤ装着方法および組み合わせ空気入りタイヤ |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61175104A (ja) | 1985-01-29 | 1986-08-06 | Bridgestone Corp | 重荷重用ラジアルタイヤ |
JP5413500B2 (ja) * | 2012-02-02 | 2014-02-12 | 横浜ゴム株式会社 | 空気入りタイヤ |
JP5447748B1 (ja) * | 2012-08-20 | 2014-03-19 | 横浜ゴム株式会社 | 空気入りタイヤ |
JP6056359B2 (ja) * | 2012-10-11 | 2017-01-11 | 横浜ゴム株式会社 | 空気入りタイヤ |
JP5890853B2 (ja) * | 2014-02-14 | 2016-03-22 | 住友ゴム工業株式会社 | 空気入りタイヤ |
-
2015
- 2015-07-27 JP JP2015147930A patent/JP2017024658A/ja active Pending
-
2016
- 2016-05-11 KR KR1020177025248A patent/KR101947392B1/ko not_active Expired - Fee Related
- 2016-05-11 DE DE112016003406.7T patent/DE112016003406T5/de not_active Withdrawn
- 2016-05-11 CN CN201680041438.1A patent/CN107848340B/zh not_active Expired - Fee Related
- 2016-05-11 WO PCT/JP2016/064002 patent/WO2017018019A1/ja active Application Filing
- 2016-05-11 US US15/745,421 patent/US10828939B2/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004203322A (ja) * | 2002-12-26 | 2004-07-22 | Bridgestone Corp | 空気入りタイヤ |
JP2009096398A (ja) * | 2007-10-18 | 2009-05-07 | Bridgestone Corp | 空気入りタイヤ |
JP2012218652A (ja) * | 2011-04-12 | 2012-11-12 | Sumitomo Rubber Ind Ltd | 空気入りタイヤ |
JP2013147141A (ja) * | 2012-01-19 | 2013-08-01 | Bridgestone Corp | タイヤ |
JP2013220780A (ja) * | 2012-04-18 | 2013-10-28 | Yokohama Rubber Co Ltd:The | 空気入りタイヤ |
WO2015012160A1 (ja) * | 2013-07-24 | 2015-01-29 | 横浜ゴム株式会社 | 空気入りタイヤ装着方法および組み合わせ空気入りタイヤ |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018016302A1 (ja) * | 2016-07-19 | 2018-01-25 | 横浜ゴム株式会社 | 空気入りタイヤ |
US11400762B2 (en) | 2016-07-19 | 2022-08-02 | The Yokohama Rubber Co., Ltd. | Pneumatic tire |
DE112017003624B4 (de) | 2016-07-19 | 2024-03-28 | The Yokohama Rubber Co., Ltd. | Luftreifen |
Also Published As
Publication number | Publication date |
---|---|
KR101947392B1 (ko) | 2019-02-13 |
US10828939B2 (en) | 2020-11-10 |
US20180207992A1 (en) | 2018-07-26 |
CN107848340B (zh) | 2019-12-03 |
CN107848340A (zh) | 2018-03-27 |
DE112016003406T5 (de) | 2018-04-12 |
JP2017024658A (ja) | 2017-02-02 |
KR20170115606A (ko) | 2017-10-17 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2017018174A1 (ja) | 空気入りタイヤ | |
WO2018016302A1 (ja) | 空気入りタイヤ | |
WO2017018161A1 (ja) | 空気入りタイヤ | |
WO2017018019A1 (ja) | 空気入りタイヤ | |
JP6330568B2 (ja) | 空気入りタイヤ | |
JP6992533B2 (ja) | 空気入りタイヤ | |
KR101947391B1 (ko) | 공기입 타이어 | |
JP6610717B1 (ja) | 空気入りタイヤ | |
WO2016117696A1 (ja) | 空気入りタイヤ | |
WO2019142508A1 (ja) | 空気入りタイヤ | |
WO2017018176A1 (ja) | 空気入りタイヤ | |
JP6798620B2 (ja) | 空気入りタイヤ | |
WO2017018175A1 (ja) | 空気入りタイヤ | |
JP2018065429A (ja) | 空気入りタイヤ | |
JP7102983B2 (ja) | 空気入りタイヤ | |
JP7283331B2 (ja) | 空気入りタイヤ | |
JP7276045B2 (ja) | 空気入りタイヤ | |
WO2020209114A1 (ja) | 空気入りタイヤ | |
JP2022056696A (ja) | タイヤ | |
WO2017043227A1 (ja) | 空気入りタイヤ | |
WO2020032278A1 (ja) | 空気入りタイヤ | |
JP2022056698A (ja) | タイヤ | |
JP2018020689A (ja) | 空気入りタイヤ |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 16830124 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 20177025248 Country of ref document: KR Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 15745421 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 112016003406 Country of ref document: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 16830124 Country of ref document: EP Kind code of ref document: A1 |