WO2017138623A1 - 空気入りタイヤ - Google Patents
空気入りタイヤ Download PDFInfo
- Publication number
- WO2017138623A1 WO2017138623A1 PCT/JP2017/004823 JP2017004823W WO2017138623A1 WO 2017138623 A1 WO2017138623 A1 WO 2017138623A1 JP 2017004823 W JP2017004823 W JP 2017004823W WO 2017138623 A1 WO2017138623 A1 WO 2017138623A1
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- WIPO (PCT)
- Prior art keywords
- tire
- groove
- lug
- land
- land portion
- 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
- B60C11/0306—Patterns comprising block rows or discontinuous ribs
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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
- B60C11/1204—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe
- B60C11/1218—Three-dimensional shape with regard to depth and extending direction
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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
- B60C11/01—Shape of the shoulders between tread and sidewall, e.g. rounded, stepped or cantilevered
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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
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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
- B60C11/0306—Patterns comprising block rows or discontinuous ribs
- B60C11/0309—Patterns comprising block rows or discontinuous ribs further characterised by the groove cross-section
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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
- B60C11/0327—Tread patterns characterised by special properties of 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
- B60C11/11—Tread patterns in which the raised area of the pattern consists only of isolated elements, e.g. blocks
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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
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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
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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
- B60C2011/0344—Circumferential grooves 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
- 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
- B60C2011/0358—Lateral grooves, i.e. having an angle of 45 to 90 degees to 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
- 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
- B60C2011/0365—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane characterised by width
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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
- B60C2011/0358—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane
- B60C2011/0372—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane with particular inclination angles
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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
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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
- B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
- B60C11/1204—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe
- B60C2011/1209—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special shape of the sipe straight at the tread surface
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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
- B60C11/1204—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
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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
- B60C2011/1295—Sipe density, i.e. the distance between the sipes within the pattern variable
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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
- B60C2200/00—Tyres specially adapted for particular applications
- B60C2200/04—Tyres specially adapted for particular applications for road vehicles, e.g. passenger cars
Definitions
- the present invention relates to a pneumatic tire, and more particularly to a pneumatic tire that can improve the snow performance of the tire.
- all-season passenger car tires and light truck tires employ a block pattern having a plurality of block rows in order to improve the snow performance of the tire.
- a technique described in Patent Document 1 is known.
- An object of the present invention is to provide a pneumatic tire that can improve the snow performance of the tire.
- a pneumatic tire according to the present invention includes four or more circumferential main grooves extending in the tire circumferential direction, and five or more rows of land portions defined by the circumferential main grooves.
- the left and right land portions on the outermost side in the tire width direction are defined as shoulder land portions, and the left and right land portions in the second row from the outer side in the tire width direction are defined as second land portions.
- the center land portion and the left and right second land portions have a predetermined inclination angle with respect to the tire width direction.
- a plurality of through lug grooves that respectively incline in the tire width direction and in the tire width direction, the plurality of through lug grooves in the center land part, and the plurality of through lugs in the left and right second land parts groove Are inclined in opposite directions toward the tire width direction, and at least one groove wall of the through lug groove in the left and right second land portions is bent in the tire circumferential direction in a tread plan view. It has the shape of a bent portion.
- the through-lug groove in the center land portion and the through-lug grooves in the left and right second land portions are inclined in opposite directions to each other. Will improve. Further, (2) since the through lug grooves in the left and right second land portions have the groove wall of the step-like bent portion, the edge component of the through lug groove in the tread portion center region increases. These have the advantage of improving the snow performance of the tire.
- FIG. 1 is a sectional view in the tire meridian direction showing a pneumatic tire according to an embodiment of the present invention.
- FIG. 2 is a plan view showing a tread pattern of the pneumatic tire depicted in FIG. 1.
- FIG. 3 is an enlarged view showing a center region of the tread pattern shown in FIG.
- FIG. 4 is an enlarged view showing a center land portion of the tread pattern shown in FIG.
- FIG. 5 is an enlarged view showing a second land portion of the tread pattern shown in FIG.
- FIG. 6 is an explanatory view showing a modification of the second land portion shown in FIG.
- FIG. 7 is an enlarged view showing a shoulder land portion of the tread pattern shown in FIG.
- FIG. 8 is an explanatory diagram illustrating an example of a three-dimensional sipe.
- FIG. 9 is an explanatory diagram illustrating an example of a three-dimensional sipe.
- FIG. 10 is a chart showing the results of the performance test of the pneumatic tire according to the embodiment of the present
- FIG. 1 is a sectional view in the tire meridian direction showing a pneumatic tire according to an embodiment of the present invention.
- the same figure has shown sectional drawing of the one-side area
- the figure shows a radial tire for a passenger car as an example of a pneumatic tire.
- the cross section in the tire meridian direction means a cross section when the tire is cut along a plane including the tire rotation axis (not shown).
- Reference sign CL denotes a tire equator plane, which is a plane that passes through the center point of the tire in the tire rotation axis direction and is perpendicular to the tire rotation axis.
- the tire width direction means a direction parallel to the tire rotation axis
- the tire radial direction means a direction perpendicular to the tire rotation axis.
- the pneumatic tire 1 has an annular structure centered on the tire rotation axis, and includes a pair of bead cores 11, a pair of bead fillers 12, 12, a carcass layer 13, a belt layer 14, and a tread rubber 15. And a pair of sidewall rubbers 16 and 16 and a pair of rim cushion rubbers 17 and 17 (see FIG. 1).
- the pair of bead cores 11 and 11 is an annular member formed by bundling a plurality of bead wires, and constitutes the core of the left and right bead portions.
- the pair of bead fillers 12 and 12 are disposed on the outer circumference in the tire radial direction of the pair of bead cores 11 and 11 to constitute a bead portion.
- the carcass layer 13 has a single layer structure composed of a single carcass ply or a multilayer structure formed by laminating a plurality of carcass plies, and is bridged in a toroidal shape between the left and right bead cores 11 and 11 to form a tire skeleton. Constitute. Further, both end portions of the carcass layer 13 are wound and locked outward in the tire width direction so as to wrap the bead core 11 and the bead filler 12.
- the carcass ply of the carcass layer 13 is formed by coating a plurality of carcass cords made of steel or an organic fiber material (for example, aramid, nylon, polyester, rayon, etc.) with a coat rubber and rolling it, and has an absolute value of 80 It has a carcass angle (inclination angle in the fiber direction of the carcass cord with respect to the tire circumferential direction) of [deg] or more and 95 [deg] or less.
- an organic fiber material for example, aramid, nylon, polyester, rayon, etc.
- the belt layer 14 is formed by laminating a pair of cross belts 141 and 142 and a belt cover 143, and is arranged around the outer periphery of the carcass layer 13.
- the pair of cross belts 141 and 142 is formed by rolling a plurality of belt cords made of steel or organic fiber material with a coating rubber, and has an absolute value of a belt angle of 20 [deg] or more and 55 [deg] or less.
- the pair of cross belts 141 and 142 have belt angles with different signs from each other (inclination angle of the fiber direction of the belt cord with respect to the tire circumferential direction), and are laminated so that the fiber directions of the belt cords cross each other. (Cross ply structure).
- the belt cover 143 is formed by rolling a plurality of cords made of steel or organic fiber material covered with a coat rubber, and has a belt angle of 0 [deg] or more and 10 [deg] or less in absolute value. Further, the belt cover 143 is disposed so as to be laminated on the outer side in the tire radial direction of the cross belts 141 and 142.
- the tread rubber 15 is disposed on the outer circumference in the tire radial direction of the carcass layer 13 and the belt layer 14 to constitute a tread portion of the tire.
- the pair of side wall rubbers 16 and 16 are respectively arranged on the outer side in the tire width direction of the carcass layer 13 to constitute left and right side wall portions.
- the pair of rim cushion rubbers 17, 17 are respectively disposed on the inner side in the tire radial direction of the wound portions of the left and right bead cores 11, 11 and the carcass layer 13, and constitute the contact surfaces of the left and right bead portions with respect to the rim flange.
- FIG. 2 is a plan view showing a tread pattern of the pneumatic tire depicted in FIG. 1.
- the figure shows a tread pattern of an all-season tire.
- the tire circumferential direction refers to the direction around the tire rotation axis.
- Reference symbol T denotes a tire ground contact end.
- the pneumatic tire 1 includes a plurality of circumferential main grooves 21 and 22 extending in the tire circumferential direction, and a plurality of land portions 31 to 22 partitioned by the circumferential main grooves 21 and 22. 33 and a plurality of lug grooves 411, 412, 421, 422, 431, 432 arranged in the land portions 31 to 33 are provided in the tread portion.
- the circumferential main groove is a circumferential groove having a wear indicator indicating the end of wear, and generally has a groove width of 5.0 [mm] or more and a groove depth of 7.5 [mm] or more.
- the lug groove means a lateral groove having a groove width of 2.0 [mm] or more and a groove depth of 3.0 [mm] or more.
- the sipe described later is a cut formed in the land portion, and generally has a sipe width of less than 1.5 [mm].
- the groove width is measured as the maximum value of the distance between the left and right groove walls at the groove opening in a no-load state in which the tire is mounted on the specified rim and filled with the specified internal pressure.
- the groove width is based on the intersection of the tread surface and the extension line of the groove wall in a cross-sectional view in which the groove length direction is a normal direction. Measured.
- the groove width is measured with reference to the center line of the amplitude of the groove wall.
- the groove depth is measured as the maximum value of the distance from the tread surface to the groove bottom in an unloaded state in which the tire is mounted on the specified rim and filled with the specified internal pressure. Moreover, in the structure which a groove
- Specified rim means “Applicable rim” defined in JATMA, “Design Rim” defined in TRA, or “Measuring Rim” defined in ETRTO.
- the specified internal pressure refers to the “maximum air pressure” specified by JATMA, the maximum value of “TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES” specified by TRA, or “INFLATION PRESSURES” specified by ETRTO.
- the specified load is the “maximum load capacity” specified in JATMA, the maximum value of “TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES” specified in TRA, or “LOAD CAPACITY” specified in ETRTO.
- the specified internal pressure is air pressure 180 [kPa]
- the specified load is 88 [%] of the maximum load capacity.
- the pneumatic tire 1 has a tread pattern that is symmetric with respect to a point on the tire equatorial plane CL.
- the four circumferential main grooves 21 and 22 are arranged symmetrically about the tire equatorial plane CL. Further, five rows of land portions 31 to 33 are defined by the four circumferential main grooves 21 and 22. Further, one land portion 31 is disposed on the tire equator plane CL.
- the present invention is not limited to this, and five or more circumferential main grooves may be arranged (not shown). Further, the circumferential main grooves 21 and 22 may be arranged asymmetrically about the tire equatorial plane CL (not shown). Further, the circumferential main groove may be disposed on the tire equatorial plane CL (not shown). For this reason, the land part 31 can be arrange
- the four circumferential main grooves 21, 22 have a straight shape as a whole, and the edge portions of the left and right land portions 31-33 protrude toward the circumferential main grooves 21, 22. Thereby, the groove wall of each circumferential direction main groove 21 and 22 is changing in the step shape toward the tire circumferential direction.
- the present invention is not limited to this, and the circumferential main grooves 21 and 22 may have a simple straight shape, or may have a zigzag shape or a wavy shape extending while being bent or curved in the tire circumferential direction. Good (not shown).
- the left and right circumferential main grooves 22 and 22 on the outermost side in the tire width direction are referred to as outermost circumferential main grooves.
- the tread portion center region and the tread portion shoulder region are defined with the left and right outermost circumferential main grooves 22 and 22 as boundaries.
- the land portion 33 that is the outermost in the tire width direction is defined as a shoulder land portion.
- the shoulder land portion 33 is a land portion on the outer side in the tire width direction defined by the outermost circumferential main groove 22 and has a tire ground contact end T on the tread surface.
- the land portion 32 in the second row from the outer side in the tire width direction is defined as the second land portion.
- the second land portion 32 is a land portion on the inner side in the tire width direction defined by the outermost circumferential main groove 22 and is adjacent to the shoulder land portion 33 with the outermost circumferential main groove 22 interposed therebetween.
- the land portion 31 that is closer to the tire equator plane CL than the second land portion 32 is defined as the center land portion.
- the center land portion 31 may be disposed on the tire equator plane CL (FIG. 2), or may be disposed at a position away from the tire equator plane CL (not shown).
- all the land portions 31 to 33 each have a plurality of lug grooves 411, 412; 421, 422; 431, 432 extending in the tire width direction.
- some lug grooves 411, 412; 421, 422; 431 are through lug grooves penetrating the corresponding land portions 31; 32; 33 in the tire width direction, and are arranged at predetermined intervals in the tire circumferential direction.
- all the land portions 31 to 33 are divided in the tire circumferential direction by the lug grooves 411, 412; 421, 422; 431, and a block row composed of a plurality of blocks is formed.
- all the lug grooves 431 and 432 of the shoulder land portion 33 may be non-through lug grooves that terminate in the shoulder land portion 33 at one end (not shown).
- the shoulder land portion 33 is a rib continuous in the tire circumferential direction.
- this pneumatic tire 1 employs the following configuration in order to achieve both snow performance and noise performance of the tire.
- FIG. 3 is an enlarged view showing the center region of the tread pattern shown in FIG.
- FIG. 6 simply shows the arrangement structure of the through lug grooves 411 and 412 of the center land portion 31 and the through lug grooves 421 and 422 of the second land portion 32.
- the center land portion 31 and the left and right second land portions 32, 32 include a plurality of through lug grooves 411, 412; 421, 422 that penetrate the land portions 31; 32 in the tire width direction.
- the center land portion 31 and the left and right second land portions 32, 32 are divided in the tire circumferential direction to form a block row.
- the through-lug grooves 411, 412, 421, 422 of the center land portion 31 and the left and right second land portions 32, 32 are inclined at a predetermined inclination angle (dimension symbol omitted in the drawing) with respect to the tire width direction.
- the absolute value of the inclination angle of the through lug grooves 411, 412, 421, 422 is preferably in the range of 5 [deg] or more and 70 [deg] or less, and in the range of 10 [deg] or more and 60 [deg] or less. It is more preferable that it is in the range of 20 [deg] or more and 48 [deg] or less.
- the absolute value of the inclination angle of the through lug grooves 411 and 412 of the center land portion 31 has a difference of 15 [deg] or more than the absolute value of the through lug grooves 421 and 422 of the left and right second land portions 32 and 32. Small is preferable.
- the inclination angle of the through lug groove in the center land portion and the second land portion is measured as an angle formed by an imaginary line connecting the center point of the opening portion of the through lug groove with respect to the left and right circumferential main grooves and the tire rotation axis. Further, the inclination angle of the through lug groove in the shoulder land portion is measured as an angle formed by an imaginary line connecting the center point of the opening portion of the through lug groove with respect to the outermost circumferential main groove and the tire ground contact end and the tire rotation axis.
- the plurality of through lug grooves 411 and 412 in the center land portion 31 and the plurality of through lug grooves 421 and 422 in the left and right second land portions 32 are inclined in opposite directions toward the tire width direction. To do.
- the through lug grooves 421 and 422 in the left and right second land portions 32 and 32 are inclined in the same direction. Thereby, the traction property on the snow road surface at the time of vehicle turning increases, and the snow performance (particularly turning performance) of the tire is improved.
- the through-lug grooves 411, 412, 431 of the center land portion 31 and the left and right shoulder land portions 33, 33 and the through-lug grooves 421, 422 of the left and right second land portions 32, 32 are directed in the tire width direction. They are inclined in opposite directions.
- the through lug grooves 411 and 412 of the center land portion 31 and the through lug grooves 431 of the shoulder land portion 33 are inclined in the same direction, and the through lug grooves 411 and 412 of the left and right second land portions 32 and 32 are provided. Are inclined in the same direction.
- channel of adjacent land part 31, 32; 32,33 is mutually reversed. Thereby, in the whole tread pattern, the penetration lug grooves 411, 412, 421, 422, and 431 are arranged in a zigzag shape toward the tire width direction. Thereby, the traction property on the snow road surface when the vehicle turns is further enhanced.
- channel 411, 412, 421, 422; 421,422,431 of adjacent land part 31,32; 32,33 are offset from each other in the tire circumferential direction. For this reason, the penetration lug grooves 411, 412, 421, 422; 421, 422, 431 of the adjacent land portions 31, 32; 32, 33 are not on the extension line of the groove center line and are discontinuously arranged with each other. Has been. Thereby, the traction property on the snow road surface is further enhanced.
- FIG. 4 is an enlarged view showing a center land portion of the tread pattern shown in FIG.
- FIG. 5 is an enlarged view showing a second land portion of the tread pattern shown in FIG.
- FIG. 6 is an explanatory view showing a modification of the second land portion shown in FIG.
- the center land portion 31 and the left and right second land portions 32, 32 include a plurality of types of through lug grooves 411, 412; 421, 422 and these through lug grooves 411, 412; 422, a plurality of types of blocks 311, 312; 321, 322 (see FIG. 3).
- a plurality of types of through lug grooves 411, 412; 421, 422 are periodically arranged in the tire circumferential direction.
- the plural types of blocks 311 and 312; 321 and 322 have shapes different from each other.
- a plurality of sets of block units each including the plurality of types of blocks 311, 312; 321, 322 are repeatedly arranged over the entire circumference of the tire.
- the land portions 31 and 32 in the center region of the tread portion each include a block row including a plurality of types of blocks 311 and 312; 321, and 322, thereby reducing pattern noise during tire rolling caused by the block shape. Is done. Thereby, the noise performance of the tire (particularly the in-vehicle noise performance) is improved.
- the number of types of the above-described through lug grooves and blocks is set in the range of 2 or more and 3 or less.
- the pneumatic tire 1 has a pitch variation structure in which the pitch arrangement of the entire tread pattern is changed in the tire circumferential direction, and the circumferential lengths of the blocks of the land portions 31 to 33 are periodic in the tire circumferential direction. Is changing. Therefore, in the center land portion 31 and the left and right second land portions 32, 32, the circumferential length of the block unit including the above-described plural types of blocks 311, 312; 321, 322 as a set is the pitch variation structure described above. Due to this, it periodically changes in the tire circumferential direction. Thereby, the pattern noise at the time of tire rolling is reduced effectively.
- the center land portion 31 includes two types of through lug grooves 411 and 412, and these through lug grooves 411 and 412 are alternately arranged in the tire circumferential direction (see FIG. 2). .
- the through lug grooves 411 and 412 adjacent to each other in the tire circumferential direction have different inclination angles ⁇ 11 and ⁇ 12 (dimension symbols omitted in the figure).
- two types of blocks 311 and 312 that are partitioned by these through lug grooves 411 and 412 are alternately arranged in the tire circumferential direction.
- the blocks 311 and 312 adjacent in the tire circumferential direction have different shapes.
- these blocks 311 and 312 have contour shapes that are point-symmetric with each other.
- an edge portion on the one circumferential main groove 21 side (right side in FIG. 4) of the first block 311 is long in the tire circumferential direction, and an edge on the other circumferential main groove 21 side (left side in FIG. 4). The part is short.
- the edge portion on one circumferential main groove 21 side (right side in FIG. 4) of the second block 312 is short, and the edge portion on the other circumferential main groove 21 side (left side in FIG. 4) is long. It is. For this reason, when paying attention to the edge portion on one side of the center land portion 31, the long edge portion and the short edge portion are alternately arranged in the tire circumferential direction.
- the two types of through lug grooves 411 and 412 are inclined in the same direction with respect to the tire width direction, and the inclination angle ⁇ 11 of the narrow first through lug groove 411 is inclined of the wide second through lug groove 412. It is larger than the angle ⁇ 12 ( ⁇ 12 ⁇ 11).
- the difference between the inclination angles ⁇ 11 and ⁇ 12 is preferably in the range of 3 [deg] ⁇ ⁇ 11 ⁇ 12 ⁇ 20 [deg], and in the range of 5 [deg] ⁇ ⁇ 11 ⁇ 12 ⁇ 10 [deg]. More preferably.
- the difference ⁇ 11- ⁇ 12 between the inclination angles ⁇ 11, ⁇ 12 of the adjacent through lug grooves 411, 412 is ensured, and the effect of reducing pattern noise during tire rolling is ensured, and the blocks adjacent in the tire circumferential direction 311, 312; 321, 322, the difference in rigidity or edge length is reduced, and uneven wear of the block is suppressed.
- the groove width Wg11 of the narrow first through lug groove 411 and the groove width Wg12 of the wide second through lug groove 412 preferably have a relationship of 1.10 ⁇ Wg12 / Wg11 ⁇ 3.00. It is more preferable to have a relationship of 1.30 ⁇ Wg12 / Wg11 ⁇ 2.00. Thereby, the ratio Wg12 / Wg11 of the groove widths Wg11 and Wg12 of the adjacent through lug grooves 411 and 412 is optimized.
- the groove width Wg12 of the wide second through lug groove 412 can be appropriately selected according to the tire size. In general tires for passenger cars and light trucks for all seasons, the groove width Wg12 of the wide second through lug groove 412 is within the range of 3.8 [mm] ⁇ Wg12 ⁇ 5.3 [mm]. is there.
- the through lug grooves 411 and 412 of the center land portion 31 each have a step-like bent portion in a tread plan view.
- the left and right groove walls of the through lug grooves 411 and 412 of the center land portion 31 are in the tire circumferential direction in the center region (region of 1/3 of the block width) in the tire width direction of the blocks 311 and 312.
- Each has a step-like bent portion that bends.
- the bent portions of the through lug grooves 411 and 412 have a Z shape or a crank shape in plan view of the tread.
- the left and right groove walls of the through lug grooves 411 and 412 are arranged in parallel so that the groove widths of the through lug grooves 411 and 412 are substantially constant.
- the edge components of the through lug grooves 411 and 412 are increased as compared with the configuration in which the lug grooves have a straight shape. Thereby, the snow performance of a tire improves.
- the step-shaped bent portion includes a first groove wall portion, a second groove wall portion that is arranged offset in the tire circumferential direction with respect to the first groove wall portion, and the tire groove extending in the tire circumferential direction. It is defined by the circumferential groove wall portion connecting the one groove wall portion and the second groove wall portion.
- an angle formed by the wall surface of the circumferential groove wall portion and the tire circumferential direction is preferably in the range of 80 [deg] or more and 100 [deg] or less, and 85 [deg]. More preferably, it is in the range of 95 [deg] or less.
- the through lug grooves 411 and 412 have only a single bent portion.
- the present invention is not limited to this, and the through lug grooves 411 and 412 may have a plurality of bent portions (not shown). ).
- the groove walls of the through lug grooves 411 and 412 have a linear shape as a whole except for the bent portions.
- the present invention is not limited to this, and the through lug grooves 421 and 422 ( As shown in FIG. 5, the groove walls of the through lug grooves 411 and 412 may be curved in an arc shape as a whole.
- the through lug grooves 411 and 412 of the center land portion 31 have constant groove widths Wg11 and Wg12 over the entire area in the groove length direction.
- the present invention is not limited to this.
- the groove widths Wg11 and Wg12 of the through lug grooves 411 and 412 are directed in the groove length direction. May be changed (not shown).
- the left and right second land portions 32, 32 include two types of through lug grooves 421, 422, and these through lug grooves 421, 422 are alternately arranged in the tire circumferential direction. (See FIG. 2). Further, the through lug grooves 421 and 422 adjacent in the tire circumferential direction have mutually different inclination angles ⁇ 21 and ⁇ 22 (dimension symbols omitted in the figure). In addition, two types of blocks 321 and 322 divided into these through lug grooves 421 and 422 are alternately arranged in the tire circumferential direction. Thereby, the blocks 321 and 322 adjacent to each other in the tire circumferential direction have different shapes.
- the left and right edge portions on the circumferential main grooves 21 and 22 side of the blocks 321 and 322 have different circumferential lengths. Further, the edge portion on the tire equatorial plane CL side of one adjacent block 321 is long in the tire circumferential direction, and the edge portion on the tire ground contact end T side is short. Conversely, the edge portion on the tire equatorial plane CL side of the other block 322 is short in the tire circumferential direction, and the edge portion on the tire ground contact end T side is long in the tire circumferential direction.
- the edge portions of adjacent blocks 321 and 322 are tires so that the short edge portions protrude toward the circumferential main grooves 21 and 22 rather than the long edge portions. They are arranged offset from each other in the width direction.
- the two types of through lug grooves 421 and 422 are inclined in the same direction (upward toward the tire equatorial plane in FIG. 5) with respect to the tire width direction, and the inclination angle ⁇ 21 of the through lug groove 421 penetrates. It is larger than the inclination angle ⁇ 22 of the lug groove 422 ( ⁇ 22 ⁇ 21).
- the difference between the inclination angles ⁇ 21 and ⁇ 22 is preferably in the range of 5 [deg] ⁇ ⁇ 21 ⁇ 22 ⁇ 40 [deg], and the range of 10 [deg] ⁇ ⁇ 21 ⁇ 22 ⁇ 20 [deg]. More preferably.
- the difference ⁇ 21- ⁇ 22 between the inclination angles ⁇ 21, ⁇ 22 of the adjacent through lug grooves 421, 422 is ensured, and the effect of reducing pattern noise during tire rolling is ensured, and the blocks adjacent in the tire circumferential direction 311, 312; 321, 322, the difference in rigidity or edge length is reduced, and uneven wear of the block is suppressed.
- the blocks 321 and 322 of the second land portion 32 have one circumferential narrow groove 323 and 324, respectively.
- the circumferential narrow grooves 323 and 324 have a bent shape having an amplitude in the tire width direction, and open to the adjacent through lug grooves 421 and 422 penetrating the blocks 321 and 322 in the tire circumferential direction, respectively.
- the blocks 321 and 322 are divided in the tire width direction, and the contact surface pressure of the blocks 321 and 322 at the time of tire contact is made uniform.
- the circumferential narrow grooves 323 and 324 have a bent shape, the edge component of the second land portion 32 is increased, and the snow performance of the tire is improved.
- the circumferential narrow grooves 323 and 324 are arranged in the center region (the region of 1/3 of the block width) in the tire width direction of the blocks 321 and 322, and the treads of the blocks 321 and 322 are used. Divide the tire in the width direction. Further, the circumferential narrow grooves 323 and 324 have step-shaped bent portions having an amplitude in the tire width direction. Further, the bent portions of the circumferential narrow grooves 323 and 324 are arranged at the center portion in the tire circumferential direction of the blocks 321 and 322 (center portion when the blocks 321 and 322 are equally divided into three in the tire circumferential direction). Thereby, the rigidity in the tire circumferential direction of the blocks 321 and 322 is made uniform.
- the groove width Ws of the circumferential narrow grooves 323 and 324 applies a specified internal pressure by attaching the tire to the specified rim, and also applies a load corresponding to the specified load by placing it perpendicular to the flat plate in a stationary state.
- the circumferential narrow grooves 323 and 324 are set so as not to be blocked by the contact surface between the tire and the flat plate.
- the groove width Ws of the circumferential narrow grooves 323 and 324 is set in a range of 1.5 [mm] ⁇ Ws ⁇ 6.0 [mm].
- the circumferential narrow grooves 323 and 324 are appropriately opened when the tire is in contact with the ground, the blocks 321 and 322 are divided, and the contact surface pressure of the blocks 321 and 322 is appropriately uniformized.
- the edge components of the blocks 321 and 322 are secured by the circumferential narrow grooves 323 and 324, and the traction of the tire is improved.
- the groove width Ws of the circumferential narrow grooves 323 and 324 is measured as the distance between the openings of the opposing groove wall surfaces when the tire is mounted on the specified rim to apply the specified internal pressure and the load is not loaded.
- the circumferential narrow grooves 323 and 324 adjacent to each other in the tire circumferential direction open at different positions with respect to the common through lug grooves 421 and 422. That is, the openings of the circumferential narrow grooves 323 and 324 that are opposed to each other with the through lug grooves 421 and 422 interposed therebetween are arranged with their positions shifted in the tire width direction. Accordingly, the openings of the adjacent circumferential narrow grooves 323 and 324 are arranged dispersed in the tire width direction. Thereby, the whole rigidity of the second land portion 32 is made uniform.
- the circumferential narrow grooves 323 and 324 have step-shaped bent portions as described above, but the present invention is not limited to this, and the circumferential narrow grooves 323 and 324 are straight, arc-shaped, or wavy. It may have a shape (not shown).
- the through lug grooves 421 and 422 have a shape in which the groove width is increased toward the tire ground contact end T (see FIG. 2). Further, the groove widths Wg21_cl and Wg22_cl at the openings on the tire equatorial plane CL side of the through lug grooves 421 and 422 are narrower than the groove widths Wg21_t and Wg22_t at the opening on the tire ground contact end T side. Thereby, the rigidity of the region on the tire equatorial plane CL side of the blocks 321 and 322 of the second land portion 32 is ensured, and uneven wear of the blocks 321 and 322 is suppressed.
- one groove wall of the through lug grooves 421 and 422 of the second land portion 32 has a step-like bent portion in a tread plan view, and the other groove wall has a linear shape or an arc shape. Has a shape.
- the difference of groove width Wg21_cl, Wg21_t; Wg22_cl, Wg22_t of the right-and-left groove opening part of the penetration lug grooves 421 and 422 is formed.
- the step-shaped bent portions on which the groove walls of the through lug grooves 421 and 422 are applied the edge components of the lug grooves 421 and 422 are increased, and the traction property is enhanced.
- one groove wall of the through lug grooves 411 and 412 is bent at the center portion of the second land portion 32, so that the left and right groove center lines of the bent portion are offset in the tire circumferential direction at the center portion of the second land portion 32.
- the offset amounts G1 and G2 in the tire circumferential direction of the groove center lines of the through lug grooves 421 and 422 are preferably in the range of 2.0 [mm] or more and 12.0 [mm] or less.
- the bending directions of the groove center lines of the adjacent through lug grooves 421 and 422 are opposite to each other with respect to the tire circumferential direction. For this reason, the edge portion of the block 322 sandwiched between the bent portions of the adjacent through lug grooves 421 and 422 is widened on the tire equatorial plane CL side and shortened on the tire ground contact end T side. Accordingly, the tire circumference of the portion of the block 322 that becomes narrow due to the difference in the inclination angle of the through lug grooves 421 and 422 (the portion on the tire equatorial plane CL side of the block 322 divided by the circumferential narrow groove 324) The length in the direction is ensured properly.
- one groove wall of the through lug grooves 421 and 422 of the second land portion 32 has a step-like bent portion in the tread plan view, and the other groove wall It has a linear shape or an arc shape.
- the present invention is not limited to this, and as shown in the modified example of FIG. 6, the left and right groove walls of the through lug grooves 421 and 422 of the second land portion 32 have step-like bent portions in a tread plan view, respectively. Also good.
- the center land portion 31 has a notch 313 only in the opening of the narrow through lug groove 411, and does not have a notch in the opening of the wide through lug groove 412. As shown in FIG. 4, the center land portion 31 has a chamfered portion 314 at an edge portion of the notch portion 313. By these, the drainage property and snow drainage property of the narrow through lug groove 411 are ensured. Further, the groove volume of the narrow through lug groove 411 is supplemented by the notch 313 and the chamfered portion 314, and the rigidity in the tire circumferential direction of the center land portion 31 is made uniform.
- the notch portion 313 refers to a portion formed at the edge portion of the land portion 31 and having a predetermined depth.
- the notch 313 is intended to increase the groove volume of the through lug groove 411, and therefore, more than the chamfered portion (not shown) formed at the chamfered portion 314 of the notched portion 313 and the edge portion of the land portion 31. It has a large depth D2. The depth D2 of the notch 313 will be described later.
- the chamfered portion refers to a portion that connects the edge portions of adjacent surfaces with a flat surface (for example, C chamfering) or a curved surface (for example, R chamfering).
- the adjacent through lug grooves 421 and 422 of the second land portion 32 have different inclination angles, and the extension line of the groove center line of these through lug grooves 421 and 422 is the center.
- the land portions 31 intersect each other at the edge portions.
- the notch 313 of the center land portion 31 is formed so as to surround the extension line of the groove center line of the adjacent through lug grooves 411 and 412.
- the notch 313 has an L-shaped or V-shaped bent wall surface that surrounds an extension of the groove center line of the pair of through lug grooves 421 and 422.
- a chamfered portion 314 is formed along the bent cutout portion 313.
- the notch 313 has the bent convex side facing the tire circumferential direction and the inner side in the width direction of the center land portion 31.
- one notch 313 having a V shape is formed across two blocks 311 and 312 adjacent in the tire circumferential direction and crosses one opening of the through lug grooves 411 and 412.
- the through lug grooves 411 and 412 communicate with the notch 313 and open to the circumferential main groove 21 via the notch 313. Accordingly, one notch 313 widens the opening of the through lug grooves 411 and 412 to the left and right along the circumferential main groove 21.
- a plurality of notches 313 are formed at the left and right edge portions of the center land portion 31, respectively.
- narrow through lug grooves 411 having notches 313 in the left and right openings, and wide through lug grooves 412 having no notches 313 in any opening are alternately arranged in the tire circumferential direction.
- a through lug groove 412 that does not have the notch 313 is spaced apart from the notch 313 in the tire circumferential direction and opens into the circumferential main groove 21 without communicating with the notch 313.
- intersection angle ⁇ 1 (see FIG. 3) between the groove center line of one through lug groove 421 and the groove center line of the circumferential main groove 21 is in the range of 50 [deg] or more and 75 [deg] or less, and the other The intersection angle ⁇ 2 between the groove center line of the through lug groove 422 and the groove center line of the circumferential main groove 21 is in the range of 15 [deg] or more and 40 [deg] or less.
- the bending angle (not shown in the drawing) of the notch 313 is preferably in the range of 10 [deg] to 70 [deg], and preferably in the range of 15 [deg] to 55 [deg]. More preferred.
- the notch 313 has an acute bent shape that is convex in the tire circumferential direction, so that the notch 313 is a groove center line of the through lug grooves 421 and 422 of the second land portion 32 as shown in FIG. The intersection of the extension lines can be enclosed along the extension line.
- the bending angle of the notch 313 is measured by the contour line of the wall surface of the notch in the tread plan view when the tire is mounted on the specified rim and the unloaded state is filled with the specified internal pressure.
- the bending angle of the notch 313 is appropriately set in relation to the pitch length of the tread pattern having a pitch variation structure.
- the maximum width W1 of the center land portion 31 and the maximum width W2 of the notch portion 313 have a relationship of 0.05 ⁇ W2 / W1 ⁇ 0.25, and 0.10 ⁇ W2 It is more preferable to have a relationship of /W1 ⁇ 0.15. As a result, the maximum width W2 of the notch 313 is ensured, the drainage performance and snow removal performance of the narrow through lug groove 411 are improved, and the center land portion 31 resulting from the notch 313 being excessively large. The decrease in rigidity of the steel sheet is suppressed.
- the maximum width W1 of the land portion is the maximum value in the tire axial direction width of the tread surface of the land portion, and is measured in a no-load state while attaching a tire to a specified rim and applying a specified internal pressure (see FIG. 4). ).
- the maximum width W2 of the notch is the maximum value of the width of the notch in the tire axial direction.
- the tire is mounted on the specified rim to apply the specified internal pressure, and the maximum width W1 of the land is measured in an unloaded state. Measured with respect to a point (see FIG. 4).
- the maximum groove depth D1 (not shown) of the through lug groove 411 and the maximum depth D2 (not shown) of the notch 313 may have a relationship of 0.30 ⁇ D2 / D1 ⁇ 1.00. Preferably, it has a relationship of 0.50 ⁇ D2 / D1 ⁇ 0.80. Thereby, the maximum depth D2 of the notch part 313 is ensured, the drainage property and snow-removing property of the through lug groove 411 are improved, and the rigidity of the land part 31 is reduced due to the notch part 313 being too deep. Is suppressed.
- the maximum groove depth D1 of the lug groove is the maximum value of the distance from the tread tread surface to the groove bottom, and is measured in a no-load state in which a tire is mounted on a specified rim and filled with a specified internal pressure. Moreover, in the structure which a lug groove has a partial bottom upper part and a sipe in a bottom part, these are excluded and depth is measured.
- the maximum depth D2 of the notch is the maximum value of the distance from the tread tread to the bottom, and is measured in a no-load state in which the tire is mounted on the specified rim and filled with the specified internal pressure. Moreover, in the structure which a notch has a partial bottom upper part and a sipe in a groove bottom, these are excluded and groove depth is measured.
- the maximum groove depth D0 (not shown) of the circumferential main groove 21 and the maximum groove depth D1 (not shown) of the through lug groove 411 of the center land portion 31 are 0.6 ⁇ D1 / D0 ⁇ 0. Is preferably in the range of .8. Thereby, the maximum groove depth D1 of the penetration lug groove 411 is optimized, and the drainage property of the lug groove 411 (412) is ensured.
- the maximum width W2 of the notch 313 and the width W3 of the chamfer 314 have a relationship of 0.20 ⁇ W3 / W2 ⁇ 4.00, and 0.30 ⁇ W3 / It is more preferable to have a relationship of W2 ⁇ 2.00.
- the width W3 of the chamfered portion 314 is preferably in the range of 1.5 [mm] ⁇ W3 ⁇ 6.0 [mm]. Thereby, the width W3 of the chamfered portion 314 is optimized.
- the width W3 of the chamfered portion is a distance between the contour line of the notch portion and the tread surface in a plan view of the tread, and is measured as a no-load state while a tire is mounted on a prescribed rim and a prescribed internal pressure is applied (FIG. 4). reference).
- the depth D3 (not shown) of the chamfered portion 314 and the maximum depth D2 (not shown) of the notch 313 have a relationship of 0.50 ⁇ D3 / D2 ⁇ 0.80.
- the depth D3 of the chamfered portion 314 is preferably in the range of 1.3 [mm] ⁇ D3 ⁇ 5.5 [mm]. Thereby, the depth D3 of the chamfered portion 314 is optimized.
- the depth D3 of the chamfered portion is a distance from the tread tread surface to the maximum depth position of the chamfered portion, and is measured as a no-load state while attaching a tire to a specified rim and applying a specified internal pressure.
- the boundary between the notch portion and the chamfered portion is defined by the intersection of the extended line of the wall surface on the bottom side of the notch portion 313 and the inclined surface of the chamfered portion 314 connected to the tread surface of the center land portion 31.
- FIG. 7 is an enlarged view showing a shoulder land portion of the tread pattern shown in FIG.
- the shoulder land portion 33 includes a plurality of non-through lug grooves 432 in addition to the plurality of through lug grooves 431 described above.
- the through lug groove 431 passes through the shoulder land portion 33 in the tire width direction and opens to the circumferential main groove 22 and the tire ground contact end T.
- the through lug groove 431 has a shape in which the groove width is increased from the circumferential main groove 22 toward the tire ground contact end T.
- one groove wall of the through lug groove 431 has a step-like bent portion in a tread plan view, and the other groove wall has a linear shape or an arc shape.
- the present invention is not limited thereto, and the left and right groove walls of the through lug groove 431 may have a linear shape or an arc shape.
- the groove depth of the narrow portion on the circumferential main groove 22 side in the through lug groove 431 is in the range of 30% to 80% with respect to the groove depth of the wide portion on the tire ground contact end T side. It is preferable to have. Thereby, the snow removal effect
- the non-penetrating lug groove 432 opens into the circumferential main groove 22 at one end portion and terminates in the ground contact surface of the shoulder land portion 33 at the other end portion.
- the center land portion 31, the second land portion 32, and the shoulder land portion 33 each include a plurality of sipes 5.
- These sipes 5 are classified into two-dimensional sipes (so-called plane sipes) and three-dimensional sipes (so-called three-dimensional sipes). By these sipes 5, the edge components of the land portions 31 to 33 are secured, and the traction of the tire is improved.
- the two-dimensional sipe has a straight sipe wall surface in an arbitrary cross-sectional view (a cross-sectional view including a sipe width direction and a sipe depth direction) with the sipe length direction as a normal direction.
- the two-dimensional sipe only needs to have a straight shape in the above-described cross-sectional view, and can extend in the sipe length direction with a straight shape, a zigzag shape, a wave shape, an arc shape, or the like.
- the three-dimensional sipe has a bent sipe wall surface having an amplitude in the sipe width direction in both a cross-sectional view in which the sipe length direction is a normal direction and a cross-sectional view in which the sipe depth direction is a normal direction.
- the three-dimensional sipe has an action of reinforcing the rigidity of the land portion because the meshing force of the opposing sipe wall surfaces is stronger than that of the two-dimensional sipe.
- the three-dimensional sipe is sufficient if it has the above structure on the sipe wall surface, and the tread surface may have, for example, a straight shape, a zigzag shape, a wave shape, an arc shape, and the like. Examples of such a three-dimensional sipe include the following (see FIGS. 8 and 9).
- FIGS. 8 and 9 are explanatory diagrams illustrating an example of a three-dimensional sipe. These drawings show a perspective view of a three-dimensional sipe having a pyramidal sipe wall surface.
- the sipe wall surface has a structure in which a triangular pyramid and an inverted triangular pyramid are connected in the sipe length direction.
- the sipe wall surface has a zigzag shape on the tread surface side and a zigzag shape on the bottom side that are shifted in pitch in the tire width direction, and unevenness that faces each other between the zigzag shapes on the tread surface side and the bottom side.
- the sipe wall surface is an unevenness when viewed in the tire rotation direction among these unevennesses, between the convex bending point on the tread surface side and the concave bending point on the bottom side, the concave bending point on the tread surface side and the bottom side Between the convex bend points of the tread surface and the convex bend points on the tread surface side, and adjacent convex bend points that are adjacent to each other with ridge lines, and the ridge lines between the ridge lines in order in the tire width direction. It is formed by connecting in a plane.
- one sipe wall surface has an uneven surface in which convex triangular pyramids and inverted triangular pyramids are arranged alternately in the tire width direction, and the other sipe wall surface alternates between concave triangular pyramids and inverted triangular pyramids.
- the sipe wall surface has the uneven
- the sipe wall surface has a structure in which a plurality of prisms having a block shape are connected in the sipe depth direction and the sipe length direction while being inclined with respect to the sipe depth direction.
- the sipe wall surface has a zigzag shape on the tread surface.
- the sipe wall surface has a bent portion that is bent in the tire circumferential direction at two or more locations in the tire radial direction inside the block and continues in the tire width direction, and has an amplitude in the tire radial direction at the bent portion. It has a zigzag shape.
- the sipe wall surface makes the tire circumferential amplitude constant
- the inclination angle in the tire circumferential direction with respect to the normal direction of the tread surface is made smaller at the sipe bottom side part than the tread surface side part and bent.
- the amplitude of the tire in the tire radial direction is made larger at the sipe bottom side than at the tread surface side.
- the blocks 311 and 312 of the center land portion 31 each have a plurality of sipes 5, and these sipes 5 are all three-dimensional sipes.
- the sipe 5 terminates inside the blocks 311 and 312 at one end, and opens at the edge of the blocks 311 and 312 at the other end and communicates with the circumferential main groove 21.
- the sipe 5 is inclined in the same direction as the through lug groove 411 with respect to the tire circumferential direction, and extends in the tire width direction across the center line of the center land portion 31 (the tire equatorial plane CL in FIG. 4). is doing.
- the sipe 5 and the through lug grooves 411 and 412 are arranged at equal intervals and parallel to each other in the tire circumferential direction, thereby partitioning the blocks 311 and 312 into rectangular and substantially equal width regions. Further, in the blocks 311 and 312 adjacent to each other in the tire circumferential direction, the sipe 5 is inclined in the same direction with respect to the tire circumferential direction and is opened at edge portions on different sides.
- any sipe 5 is open to the edge of the block 311 without communicating with the notch 313. Therefore, the opening of the sipe 5 and the notch 313 are arranged offset from each other in the tire circumferential direction at the edge of the block 311. At this time, it is preferable that the distance g1 (the dimension symbol is omitted in the drawing) between the opening of the sipe 5 and the notch 313 is in the range of 2.0 [mm] ⁇ g1 at the edge of the block 311. Thereby, the distance g1 between the opening part of the sipe 5 and the notch part 313 is ensured appropriately.
- a part of the sipe 5 passes through the chamfered portion 314 of the notch 313 and opens at the edge portion of the block 311.
- the notch portion 313 and the chamfered portion 314 have a V shape that is convex in the tire circumferential direction, and the two blocks 311 beyond the through lug groove 411, It extends across 312.
- all the sipes 5 are arranged apart from the notch 313 and the chamfered portion 314.
- a part of the sipe 5 penetrates the chamfered portion 314 and opens at the edge portion of the block 311.
- the terminal portion of the sipe 5 inside the block 311 is disposed apart from the notch 313 and the chamfered portion 314.
- the tread surface of the block 311 extends continuously in the tire circumferential direction without being divided by the sipe 5, the cutout portion 313, and the chamfered portion 314.
- the tread of the block 311 is ensured.
- the distance g2 between the terminal portion of the sipe 5 and the chamfered portion 314 is in the range of 2.0 [mm] ⁇ g2. Thereby, the distance g2 between the terminal portion of the sipe 5 and the chamfered portion 314 is appropriately secured.
- a part of the sipe 5 penetrates the chamfered portion 314 of the notch 313.
- the present invention is not limited to this, and all the sipes 5 may be arranged apart from the notch portion 313 and the chamfered portion 314. Thereby, the rigidity of the center land part 31 is ensured.
- the blocks 321 and 322 of the second land portion 32 each have a plurality of sipes 5, and these sipes 5 are all three-dimensional sipes.
- the sipe 5 terminates inside the blocks 321 and 322 at one end portion, and opens at the edge portion of the blocks 321 and 322 at the other end portion and communicates with the circumferential main grooves 21 and 22. Yes.
- the sipe 5 extends in the tire width direction while inclining in the same direction as the through lug grooves 421 and 422 with respect to the tire circumferential direction.
- the sipe 5 and the through lug grooves 421 and 422 are arranged at equal intervals and in parallel with each other in the tire circumferential direction, thereby dividing the blocks 321 and 322 into rectangular and substantially equal width regions.
- the treads of some blocks 322 are on the tire equatorial plane CL side partitioned by the circumferential narrow grooves 324. It is relatively narrow in the area. For this reason, the number of sipes in this area is set to be smaller than the number of sipes in other areas. Thereby, the sipe density in the tread of each block 321 and 322 is equalized.
- the pneumatic tire 1 includes four or more circumferential main grooves 21 and 22 extending in the tire circumferential direction and five or more rows of land divided into the circumferential main grooves 21 and 22. Parts 31 to 33 (see FIG. 2). Further, the center land portion 31 and the left and right second land portions 32, 32 are inclined at a predetermined inclination angle with respect to the tire width direction and a plurality of through lug grooves 411 penetrating the land portions 31, 32 in the tire width direction, 412; 421, 422, respectively (see FIG. 3).
- the plurality of through lug grooves 411 and 412 in the center land portion 31 and the plurality of through lug grooves 421 and 422 in the left and right second land portions 32 are inclined in opposite directions toward the tire width direction. Further, at least one groove wall of the through lug grooves 421 and 422 in the left and right second land portions 32 and 32 has a step-like bent portion that is bent in the tire circumferential direction in a tread plan view.
- the through lug grooves 411 and 412 of the center land portion 31 and the through lug grooves 421 and 422 of the left and right second land portions 32 and 32 are inclined in opposite directions. Improves traction on the road surface.
- the through lug grooves 421 and 422 in the left and right second land portions 32 and 32 have step-shaped bent portions, the edge components of the through lug grooves in the tread center region (see FIG. 2) increase. . These have the advantage of improving the snow performance of the tire.
- At least one of the center land portion 31 and the left and right second land portions 32, 32 includes a plurality of through lug grooves 411, 412, A plurality of blocks 311, 312, 321, and 322 divided into 421 and 422 are provided (see FIG. 3). Further, the blocks 311, 312; 321, 322 adjacent to each other in the tire circumferential direction have different shapes.
- the land portions 31 and 32 in the center region of the tread portion each include a block row including a plurality of types of blocks 311 and 312; 321, and 322, thereby reducing pattern noise during tire rolling caused by the block shape. Is done. Thereby, there exists an advantage which the noise performance (especially vehicle interior noise performance) of a tire improves.
- At least one of the center land portion 31 and the left and right second land portions 32, 32 (in FIG. 3, both the center land portion 31 and the left and right second land portions 32, 32)
- a plurality of sets of through lug grooves 411, 412; 421, 422 that are adjacent in the direction and have different inclination angles are provided (see FIG. 3).
- the through lug grooves 411 and 412 adjacent to each other in the tire circumferential direction of the center land portion 31 have mutually different groove widths Wg11 and Wg12 (see FIG. 4).
- the groove width Wg11 of the narrow through lug groove 411 and the groove width Wg12 of the wide through lug groove 412 have a relationship of 1.10 ⁇ Wg12 / Wg11 ⁇ 3.00.
- the left and right groove walls of the through lug grooves 411, 412 of the center land portion 31 have step-like bent portions in a tread plan view (see FIG. 4).
- one groove wall of the through lug grooves 421 and 422 of the left and right second land portions 32 and 32 has a step-shaped bent portion in a tread plan view, and the other groove wall has a linear shape or an arc shape. (See FIG. 5).
- the left and right groove walls of the through lug grooves 411, 412, 421, 422 of the center land portion 31 and the left and right second land portions 32, 32 are stepped bent portions in a tread plan view. (See FIG. 4 and FIG. 6).
- the edge component of a penetration lug groove increases and there exists an advantage which the snow performance of a tire improves.
- the openings of the through lug grooves 411 and 412 of the center land portion 31 and the openings of the through lug grooves 421 and 422 of the second land portion 32 with respect to the circumferential main groove 21 are in the tire circumferential direction. Are offset from each other (see FIG. 3).
- the through lug grooves 411 and 412 adjacent to each other in the tire circumferential direction of the center land portion 31 have mutually different groove widths Wg11 and Wg12 (see FIG. 4).
- the center land portion 31 has the cutout portion 313 only in the opening portion of the narrow through lug groove 411, and does not have the cutout portion 313 in the opening portion of the wide through lug groove 412.
- the center land portion 31 has a chamfered portion 314 at the edge portion of the notch portion 313 (see FIG. 4).
- the adjacent through lug grooves 421 and 422 of the second land portion 32 have different inclination angles (see FIG. 3).
- the extension lines of the groove center lines of the adjacent through lug grooves 421 and 422 of the second land portion 32 intersect with each other at the edge portion of the center land portion 31.
- the notch 313 of the center land portion 31 is formed so as to surround the extension line of the groove center line of the adjacent through lug grooves 421 and 422 of the second land portion 32.
- a drainage path is formed from the notch 313 of the center land portion 31 to the circumferential main groove 22 on the tire ground contact end T side of the second land portion 32 via the lug grooves 421 and 422 of the second land portion 32.
- the second land portion 32 includes a plurality of blocks 321 and 322 that are divided into a plurality of through lug grooves 421 and 422 (see FIG. 5).
- the plurality of blocks 321 and 322 have a bent shape having an amplitude in the tire width direction and include circumferential narrow grooves 323 and 324 that penetrate the blocks 321 and 322 in the tire circumferential direction, respectively. In such a configuration, the rigidity in the tire width direction of the blocks 321 and 322 is relaxed by the circumferential narrow grooves 323 and 324.
- the contact surface pressure of the blocks 321 and 322 at the time of tire contact is reduced, and there is an advantage that uneven wear of the blocks 321 and 322 is suppressed.
- the circumferential narrow grooves 323 and 324 have an advantage that the edge components of the blocks 321 and 322 are increased and the snow performance of the tire is improved.
- the left and right shoulder land portions 33 are inclined at a predetermined inclination angle with respect to the tire width direction, and a plurality of through lug grooves 431 penetrating the shoulder land portions 33 in the tire width direction are provided.
- the plurality of through lug grooves 431 in the left and right shoulder land portions 33 and the plurality of through lug grooves 421 and 422 in the left and right second land portions 32 are inclined in opposite directions toward the tire width direction. .
- the through lug grooves 431 of the left and right shoulder land portions 33, 33 and the through lug grooves 421, 422 of the left and right second land portions 32, 32 are inclined in opposite directions, so that the snow road surface when the vehicle turns Improves traction performance. Thereby, there exists an advantage which the snow performance of a tire improves.
- At least one (both in FIG. 7) groove wall of the through lug groove 431 of the shoulder land portion 33 has a step-like bent portion that bends in the tire circumferential direction in plan view of the tread. (See FIG. 7).
- the edge component of the penetration lug groove 431 increases, and there exists an advantage which the snow performance of a tire improves.
- the opening of the through lug groove 431 of the shoulder land portion 33 with respect to the circumferential main groove 22 and the opening of the through lug grooves 421 and 422 of the second land portion 32 are mutually in the tire circumferential direction. (See FIG. 2).
- the arrangement structure of the through lug grooves 421, 422, and 431 that open to the outermost circumferential main groove 22 has a great influence on the pattern noise.
- FIG. 10 is a chart showing the results of the performance test of the pneumatic tire according to the embodiment of the present invention.
- test tire having a tire size of 265 / 65R17 112H is assembled to a rim having a rim size of 17 ⁇ 8 J, and an air pressure of 230 [kPa] and a maximum load specified by JATMA are applied to the test tire. Further, the test tire is mounted on all wheels of a four-wheel drive RV (Recreational Vehicle) vehicle having a displacement of 3.5 [L], which is a test vehicle.
- RV Recreational Vehicle
- test vehicle travels on a predetermined handling course on a snowy road at a speed of 40 [km / h], and the test driver performs a sensory evaluation on steering stability.
- This evaluation is performed by index evaluation using the conventional example as a reference (100), and the larger the value, the better.
- the test vehicle travels on a test course having a rough road surface at 60 [km / h], and the sound pressure level of in-vehicle noise (pattern noise) by a microphone attached to the window side position of the driver's seat Is measured. Then, index evaluation using the conventional example as a reference (100) is performed. In this evaluation, the larger the numerical value, the lower the sound pressure level, which is preferable.
- the test tires of Examples 1 to 12 basically have the configuration shown in FIGS. 1 and 2 and have four circumferential main grooves 21 and 22 and five rows of land portions 31 to 33.
- Each of the land portions 31 to 33 includes a plurality of through lug grooves 411, 412, 421, 422, and 431 bent in a Z shape or a crank shape, and a block row defined by these through lug grooves, respectively.
- the groove depth of the circumferential main groove is 10.0 [mm]
- the maximum groove depth of the through lug grooves 411, 412, 421, 422, and 431 is 7.0 [mm].
- the groove width Ws of the circumferential narrow grooves 323 and 324 of the second land portion 32 is 2.0 [mm], and the groove depth is 5.0 [mm].
- the center land portion 31 includes the notch portion 313, and the extension lines of the through lug grooves 421 and 422 of the second land portion 32 merge at the notch portion of the center land portion 31 as shown in FIG. ing.
- the shoulder land portion 33 includes both the through lug groove 431 and the non-through lug groove 432.
- “CE” indicates the center land portion 31
- “2nd” indicates the left and right second land portions 32, 32
- “SH” indicates the left and right shoulder land portions 33, 33.
- each through lug groove has a linear or arcuate groove shape.
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Abstract
Description
図1は、この発明の実施の形態にかかる空気入りタイヤを示すタイヤ子午線方向の断面図である。同図は、タイヤ径方向の片側領域の断面図を示している。また、同図は、空気入りタイヤの一例として、乗用車用ラジアルタイヤを示している。
図2は、図1に記載した空気入りタイヤのトレッドパターンを示す平面図である。同図は、オールシーズン用タイヤのトレッドパターンを示している。同図において、タイヤ周方向とは、タイヤ回転軸周りの方向をいう。また、符号Tは、タイヤ接地端である。
特に、オールシーズン向けの乗用車用タイヤおよびライトトラック用タイヤでは、タイヤのスノー性能を向上するために、複数のブロック列をもつブロックパターンが採用されている。一方で、かかるブロックパターンでは、パターンノイズが増加して、タイヤの騒音性能が悪化する傾向にある。
図4は、図2に記載したトレッドパターンのセンター陸部を示す拡大図である。図5は、図2に記載したトレッドパターンのセカンド陸部を示す拡大図である。図6は、図5に記載したセカンド陸部の変形例を示す説明図である。
図3において、センター陸部31が、幅狭な貫通ラグ溝411の開口部のみに切欠部313を有し、幅広な貫通ラグ溝412の開口部には切欠部を有していない。また、図4に示すように、センター陸部31が、切欠部313のエッジ部に面取部314を有している。これらにより、幅狭な貫通ラグ溝411の排水性および排雪性が確保される。また、幅狭な貫通ラグ溝411の溝容積が切欠部313および面取部314により補完されて、センター陸部31のタイヤ周方向の剛性が均一化される。
図7は、図2に記載したトレッドパターンのショルダー陸部を示す拡大図である。
図4、図5および図7に示すように、センター陸部31、セカンド陸部32およびショルダー陸部33は、複数のサイプ5をそれぞれ備える。これらのサイプ5は、二次元サイプ(いわゆる平面サイプ)および三次元サイプ(いわゆる立体サイプ)に分類される。これらのサイプ5により、陸部31~33のエッジ成分が確保されて、タイヤのトラクション性が向上する。
以上説明したように、この空気入りタイヤ1は、タイヤ周方向に延在する4本以上の周方向主溝21、22と、周方向主溝21、22に区画されて成る5列以上の陸部31~33とを備える(図2参照)。また、センター陸部31および左右のセカンド陸部32、32が、タイヤ幅方向に対して所定の傾斜角で傾斜すると共に陸部31、32をタイヤ幅方向に貫通する複数の貫通ラグ溝411、412;421、422をそれぞれ備える(図3参照)。センター陸部31にある複数の貫通ラグ溝411、412と、左右のセカンド陸部32にある複数の貫通ラグ溝421、422とが、タイヤ幅方向に向かって相互に逆方向に傾斜する。また、左右のセカンド陸部32、32にある貫通ラグ溝421、422の少なくとも一方の溝壁が、トレッド平面視にてタイヤ周方向に屈曲するステップ状の屈曲部を有する。
Claims (14)
- タイヤ周方向に延在する4本以上の周方向主溝と、前記周方向主溝に区画されて成る5列以上の陸部とを備える空気入りタイヤであって、
タイヤ幅方向の最も外側にある左右の前記陸部をショルダー陸部として定義し、タイヤ幅方向外側から2列目にある左右の前記陸部をセカンド陸部として定義し、前記セカンド陸部よりもタイヤ赤道面側にある陸部をセンター陸部として定義するときに、
前記センター陸部および左右の前記セカンド陸部が、タイヤ幅方向に対して所定の傾斜角で傾斜すると共に前記陸部をタイヤ幅方向に貫通する複数の貫通ラグ溝をそれぞれ備え、
前記センター陸部にある前記複数の貫通ラグ溝と、前記左右のセカンド陸部にある前記複数の貫通ラグ溝とが、タイヤ幅方向に向かって相互に逆方向に傾斜し、且つ、
前記左右のセカンド陸部にある前記貫通ラグ溝の少なくとも一方の溝壁が、トレッド平面視にてタイヤ周方向に屈曲するステップ状の屈曲部を有することを特徴とする空気入りタイヤ。 - 前記センター陸部および前記左右のセカンド陸部の少なくとも一つが、前記複数の貫通ラグ溝に区画されて成る複数のブロックをそれぞれ備え、且つ、
タイヤ周方向に隣り合う前記ブロックが、相互に異なる形状を有する請求項1に記載の空気入りタイヤ。 - 前記センター陸部および前記左右のセカンド陸部の少なくとも一方が、タイヤ周方向に隣り合うと共に相互に異なる前記傾斜角を有する複数組の前記貫通ラグ溝を備える請求項1または2に記載の空気入りタイヤ。
- 前記センター陸部のタイヤ周方向に隣り合う前記貫通ラグ溝が、相互に異なる溝幅を有し、且つ、
幅狭な前記貫通ラグ溝の溝幅Wg11と幅広な前記貫通ラグ溝の溝幅Wg12とが、1.10≦Wg12/Wg11≦3.00の関係を有する請求項1~3のいずれか1つに記載の空気入りタイヤ。 - 前記センター陸部の前記貫通ラグ溝の左右の溝壁が、トレッド平面視にてステップ状の屈曲部をそれぞれ有し、且つ、
前記左右のセカンド陸部の前記貫通ラグ溝の一方の溝壁が、トレッド平面視にてステップ状の屈曲部を有すると共に、他方の溝壁が、直線形状あるいは円弧形状を有する請求項1~4のいずれか1つに記載の空気入りタイヤ。 - 前記センター陸部および前記左右のセカンド陸部の前記貫通ラグ溝の左右の溝壁が、トレッド平面視にてステップ状の屈曲部をそれぞれ有する請求項1~4のいずれか1つに記載の空気入りタイヤ。
- 前記周方向主溝に対する前記センター陸部の前記貫通ラグ溝の開口部と前記セカンド陸部の前記貫通ラグ溝の開口部とが、タイヤ周方向に相互にオフセットして配置される請求項1~6のいずれか一つに記載の空気入りタイヤ。
- 前記センター陸部のタイヤ周方向に隣り合う前記貫通ラグ溝が、相互に異なる溝幅を有し、且つ、
前記センター陸部が、幅狭な前記貫通ラグ溝の開口部のみに切欠部を有し、幅広な前記貫通ラグ溝の開口部には前記切欠部を有さない請求項1~7のいずれか一つに記載の空気入りタイヤ。 - 前記センター陸部が、前記切欠部のエッジ部に面取部を有する請求項8に記載の空気入りタイヤ。
- 前記セカンド陸部の隣り合う前記貫通ラグ溝が、相互に異なる前記傾斜角を有し、
前記セカンド陸部の前記隣り合う貫通ラグ溝の溝中心線の延長線が、前記センター陸部のエッジ部で相互に交差し、且つ、
前記センター陸部の前記切欠部が、前記セカンド陸部の前記隣り合う貫通ラグ溝の溝中心線の延長線を囲んで形成される請求項8または9に記載の空気入りタイヤ。 - 前記セカンド陸部が、前記複数の貫通ラグ溝に区画されて成る複数のブロックを備え、且つ、
前記複数のブロックが、タイヤ幅方向に振幅を有する屈曲形状を有すると共に前記ブロックをタイヤ周方向に貫通する周方向細溝をそれぞれ備える請求項1~10のいずれか一つに記載の空気入りタイヤ。 - 左右の前記ショルダー陸部が、タイヤ幅方向に対して所定の傾斜角で傾斜すると共に前記ショルダー陸部をタイヤ幅方向に貫通する複数の貫通ラグ溝をそれぞれ備え、
前記左右のショルダー陸部にある前記複数の貫通ラグ溝と、前記左右のセカンド陸部にある前記複数の貫通ラグ溝とが、タイヤ幅方向に向かって相互に逆方向に傾斜する請求項1~11のいずれか一つに記載の空気入りタイヤ。 - 前記ショルダー陸部の前記貫通ラグ溝の少なくとも一方の溝壁が、トレッド平面視にてタイヤ周方向に屈曲するステップ状の屈曲部を有する請求項12に記載の空気入りタイヤ。
- 前記周方向主溝に対する前記ショルダー陸部の前記貫通ラグ溝の開口部と前記セカンド陸部の前記貫通ラグ溝の開口部とが、タイヤ周方向に相互にオフセットして配置される請求項1~13のいずれか一つに記載の空気入りタイヤ。
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AU2017216718A AU2017216718B2 (en) | 2016-02-10 | 2017-02-09 | Pneumatic tire |
DE112017000739.9T DE112017000739T5 (de) | 2016-02-10 | 2017-02-09 | Luftreifen |
US16/070,710 US11267293B2 (en) | 2016-02-10 | 2017-02-09 | Pneumatic tire |
KR1020187022366A KR102098229B1 (ko) | 2016-02-10 | 2017-02-09 | 공기입 타이어 |
RU2018131743A RU2706769C1 (ru) | 2016-02-10 | 2017-02-09 | Пневматическая шина |
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JP6962125B2 (ja) * | 2017-10-12 | 2021-11-05 | 横浜ゴム株式会社 | 空気入りタイヤ |
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CN110789276A (zh) * | 2018-08-02 | 2020-02-14 | 住友橡胶工业株式会社 | 充气轮胎 |
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JP6206517B2 (ja) | 2017-10-04 |
AU2017216718A1 (en) | 2018-07-19 |
DE112017000739T5 (de) | 2018-11-15 |
KR20180099869A (ko) | 2018-09-05 |
RU2706769C1 (ru) | 2019-11-20 |
AU2017216718B2 (en) | 2019-12-05 |
CN108602391B (zh) | 2020-06-26 |
CN108602391A (zh) | 2018-09-28 |
KR102098229B1 (ko) | 2020-04-07 |
JP2017140927A (ja) | 2017-08-17 |
US20190023080A1 (en) | 2019-01-24 |
US11267293B2 (en) | 2022-03-08 |
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