WO2015163157A1 - 空気入りタイヤ - Google Patents
空気入りタイヤ Download PDFInfo
- Publication number
- WO2015163157A1 WO2015163157A1 PCT/JP2015/061104 JP2015061104W WO2015163157A1 WO 2015163157 A1 WO2015163157 A1 WO 2015163157A1 JP 2015061104 W JP2015061104 W JP 2015061104W WO 2015163157 A1 WO2015163157 A1 WO 2015163157A1
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- WIPO (PCT)
- Prior art keywords
- tire
- groove
- circumferential groove
- lug
- inner circumferential
- 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
- B60C11/0304—Asymmetric patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
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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
- B60C11/0302—Tread patterns directional pattern, i.e. with main rolling 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
- B60C11/0306—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
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
- B60C11/1236—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- 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
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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
- B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
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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
- B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
- B60C11/1353—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove bottom
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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
- B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
- B60C11/1376—Three dimensional block surfaces departing from the enveloping tread contour
- B60C11/1384—Three dimensional block surfaces departing from the enveloping tread contour with chamfered block corners
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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
- B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
- B60C11/1376—Three dimensional block surfaces departing from the enveloping tread contour
- B60C11/1392—Three dimensional block surfaces departing from the enveloping tread contour with chamfered block edges
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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
- B60C5/00—Inflatable pneumatic tyres or inner tubes
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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
- B60C2011/0358—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
- B60C2011/0367—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane characterised by depth
- B60C2011/0369—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane characterised by depth with varying depth of the groove
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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
- B60C2011/0374—Slant grooves, i.e. having an angle of about 5 to 35 degrees 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
- B60C2011/0381—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
- B60C2011/0386—Continuous ribs
- B60C2011/0388—Continuous ribs provided at the equatorial plane
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0386—Continuous ribs
- B60C2011/039—Continuous ribs provided at the shoulder portion
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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
- B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
- B60C11/1353—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove bottom
- B60C2011/1361—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove bottom with protrusions extending from the groove bottom
Definitions
- the present invention relates to a pneumatic tire having a tread pattern formed in a tread portion.
- a groove is provided in the tread portion of the tire.
- the groove area ratio is increased, the ground contact area is reduced, so that the gripping force of the tire is reduced and the steering stability may be lowered.
- the width and number of tire circumferential grooves provided in the tread portion and the inclination angle and width of the lug grooves have been devised (for example, see Patent Document 1).
- an object of the present invention is to provide a pneumatic tire that can achieve both steering stability and braking performance.
- a tread pattern is formed in the tread portion, and the first side in the tire width direction that is the vehicle outer side in the tire width direction and the second in the tire width direction that is the inner side of the vehicle when mounted on the vehicle.
- the side is a designated pneumatic tire.
- the tread pattern is A first outer circumferential groove located on the first side with respect to the tire center line and parallel to the tire circumferential direction; A second outer circumferential groove located on the first side with respect to the first outer circumferential groove and parallel to the tire circumferential direction; A first inner circumferential groove located on the second side with respect to the tire center line and parallel to the tire circumferential direction; A second inner circumferential groove located on the second side with respect to the first inner circumferential groove and parallel to the tire circumferential direction; A first lug groove group composed of a plurality of first lug grooves that divide the inner land portion between the first inner circumferential groove and the second inner circumferential groove in the tire circumferential direction; A second lug groove group comprising a plurality of second lug grooves that divide the inner shoulder land portion located on the inner side in the tire width direction with respect to the second inner circumferential groove, in the tire circumferential direction, A center land portion between the first outer circumferential groove and the first inner circumferential groove, an outer land portion between
- a position that is between the first outer circumferential groove and the first inner circumferential groove and that is separated from the first outer circumferential groove and the first inner circumferential groove is a start end, and the first inner circumferential groove
- the third lug groove group preferably includes third lug grooves that differ in at least one of a length in the tire width direction, a width in the tire circumferential direction, and a depth in the tire radial direction.
- a position between the first outer circumferential groove and the second outer circumferential groove and spaced from the first outer circumferential groove and the second outer circumferential groove is a starting end, and the second outer A fourth lug groove group provided with a plurality of fourth lug grooves connected to the circumferential grooves;
- the fourth lug groove group preferably includes a plurality of types of fourth lug grooves that differ in at least one of a length in the tire width direction, a width in the tire circumferential direction, and a depth in the tire radial direction.
- an acute corner is formed by the first inner circumferential groove or the second inner circumferential groove and the first lug groove,
- the acute corner is chamfered by an inclined surface intersecting the tread surface of the inner land portion, the side wall of the first inner circumferential groove or the second inner circumferential groove, and the side wall of the first lug groove. It is preferable that it is applied.
- an acute angle corner is formed by the first inner circumferential groove and the third lug groove,
- the acute corner is preferably chamfered by an inclined surface that intersects the tread surface of the center land portion, the side wall of the first inner circumferential groove, and the side wall of the third lug groove.
- an acute corner is formed by the second outer circumferential groove and the fourth lug groove, Preferably, the acute corner is chamfered by an inclined surface intersecting the tread surface of the outer land portion, the side wall of the second outer circumferential groove, and the side wall of the fourth lug groove. .
- an acute corner is formed by the second inner circumferential groove and the fifth lug groove, Preferably, the acute corner is chamfered by an inclined surface that intersects the tread surface of the inner land portion, the side wall of the second inner circumferential groove, and the side wall of the fifth lug groove. .
- the tire extends from the outer side wall in the tire width direction of the second outer circumferential groove 32 at a position in the tire circumferential direction corresponding to the start end on the inner side in the tire width direction of each sixth lug groove. It is preferable that a notch that is recessed outward in the width direction and spaced apart inward in the tire width direction with respect to the start end of the sixth lug groove is provided.
- the fourth lug groove group includes a long lug groove and a lug groove whose length in the tire width direction is shorter than the long lug groove, and the long lug groove and the short lug groove are alternately arranged in the tire circumferential direction.
- a first sipe that connects the start end of the short fourth lug groove and the first outer circumferential groove and divides the outer land portion in the tire circumferential direction is further provided.
- the first sipe includes a bent portion between a start end of the fourth lug groove and the first outer circumferential groove, a first direction in a tire rotation direction from the start end of the short lug groove to the bent portion, and A first linear portion extending inward in the tire width direction, and a second direction opposite to the first direction in the tire rotation direction and the inner side in the tire width direction from the bent portion to the end on the first outer circumferential groove side And a second straight portion extending to It is preferable that each part of the said outer land part divided by the said 1st sipe in a tire circumferential direction has a convex part which becomes convex in the 1st direction of a tire rotation direction.
- a second sipe that extends from the second outer circumferential groove to the ground contact end in the tire width direction and further divides the outer shoulder land portion in the tire circumferential direction;
- the second sipe is a curved shape having a plurality of bent portions on the tread surface, It is preferable that each part of the outer side shoulder land portion defined in the tire circumferential direction by the second sipe has a convex portion that is convex in the first direction of the tire rotation direction.
- a plurality of seventh lug grooves are provided between the second lug grooves in the tire circumferential direction and extending from the second inner circumferential groove toward the inner side in the tire width direction, starting from a position spaced inward in the tire width direction.
- a seventh lug groove group A third sipe for connecting the start end of the seventh lug groove and the second inner circumferential groove is further provided; The third sipe is a bent portion between a start end of the seventh lug groove and the second inner circumferential groove, and a first direction in a tire rotating direction from the start end of the seventh lug groove to the bent portion.
- each part of the inner shoulder land portion divided in the tire circumferential direction by the third sipe has a convex portion that is convex in the second direction of the tire rotation direction.
- a fourth sipe for connecting the start end of the third lug groove and the first outer circumferential groove is further provided.
- a fifth sipe 75 intersecting with the first lug groove is further provided between the first inner circumferential groove and the second inner circumferential groove.
- the pneumatic tire is a tire whose rotation direction is predetermined
- the first lug groove is A first inclined portion extending from the first inner circumferential groove to the rear side in the tire rotation direction and the inner side in the tire width direction;
- a second inclined portion extending from the second inner circumferential groove side to the rear side in the tire rotation direction and the outer side in the tire width direction; It is preferable to have a bent portion where the first inclined portion and the second inclined portion intersect.
- the distance in the tire width direction from the bent portion to the first inner circumferential groove side is preferably shorter than the distance in the tire width direction from the bent portion to the second inner circumferential groove.
- the second inclined portion and the bent portion are a bottom upper portion having a groove depth smaller than that of the first inclined portion.
- a sixth sipe is provided in the length direction of the first lug groove in the second inclined portion and the bent portion.
- a bottom upper portion shallower than other portions of the second lug groove is provided at an end of the second lug groove on the second inner circumferential groove side.
- FIG. 1 is a tire cross-sectional view showing a cross section of a pneumatic tire (hereinafter referred to as a tire) 10 of the present embodiment.
- the tire 10 is, for example, a passenger car tire.
- Passenger car tires are tires defined in Chapter A of JATMA YEAR BOOK 2012 (Japan Automobile Tire Association Standard).
- the present invention can also be applied to small truck tires defined in Chapter B and truck and bus tires defined in Chapter C.
- the numerical value of the dimension of each pattern element specifically explained below is a numerical example in the tire for passenger cars, and the pneumatic retirement according to the present invention is not limited to these numerical examples.
- the tire circumferential direction described below refers to the direction of rotation of the tread surface (both rotation directions) when the tire 10 is rotated about the tire rotation axis, and the tire radial direction refers to the tire rotation axis.
- the radial direction extending orthogonally refers to the tire radial direction outer side, which is the side away from the tire rotation axis in the tire radial direction.
- the tire width direction means a direction parallel to the tire rotation axis direction, and the tire width direction outside means both sides of the tire 10 away from the tire center line CL.
- the tire 10 has a pair of bead cores 11, a carcass ply layer 12, and a belt layer 14 as a skeleton material, and a tread rubber member 18, a side rubber member 20, and a bead filler rubber around these skeleton materials. It mainly includes a member 22, a rim cushion rubber member 24, and an inner liner rubber member 26.
- the pair of bead cores 11 has an annular shape, and is disposed at both ends in the tire width direction and at inner ends in the tire radial direction.
- the carcass ply layer 12 is composed of one or a plurality of carcass ply materials 12a and 12b in which organic fibers are covered with rubber.
- the carcass ply materials 12 a and 12 b are formed in a toroidal shape by being wound between a pair of bead cores 11.
- the belt layer 14 includes a plurality of belt members 14 a and 14 b and is wound around the outer side of the carcass ply layer 12 in the tire radial direction in the tire circumferential direction.
- the width in the tire width direction of the belt material 14a on the inner side in the tire radial direction is wider than the width of the belt material 14b on the outer side in the tire radial direction.
- the belt members 14a and 14b are members in which a steel cord is covered with rubber.
- the steel cord of the belt material 14a and the steel cord of the belt material 14b are arranged to be inclined at a predetermined angle, for example, 20 to 30 degrees with respect to the tire circumferential direction.
- the steel cord of the belt material 14a and the steel cord of the belt material 14b are inclined in directions opposite to each other with respect to the tire circumferential direction and cross each other.
- the belt layer 14 suppresses the expansion of the carcass ply layer 12 due to the filled air pressure.
- a tread rubber member 18 is provided outside the belt layer 14 in the tire radial direction.
- Side rubber members 20 are connected to both ends of the tread rubber member 18.
- the tread rubber member 18 includes a two-layer rubber member including an upper layer tread rubber member 18a provided on the outer side in the tire radial direction and a lower layer tread rubber member 18b provided on the inner side in the tire radial direction.
- a rim cushion rubber member 24 is provided at the inner end in the tire radial direction of the side rubber member 20. The rim cushion rubber member 24 comes into contact with a rim on which the tire 10 is mounted.
- a bead filler rubber member 22 is provided outside the bead core 11 in the tire radial direction so as to be sandwiched between carcass ply layers 12 wound around the bead core 11.
- An inner liner rubber member 26 is provided on the inner surface of the tire 10 facing the tire cavity region filled with air surrounded by the tire 10 and the rim.
- the tire 10 includes a belt cover layer 28 that covers the outer surface of the belt layer 14 in the tire radial direction.
- the belt cover layer 28 is made of organic fibers and rubber that covers the organic fibers.
- the tire 10 has the tire structure shown in FIG. 1, the tire structure of the pneumatic tire of the present invention is not limited to this.
- FIG. 2 is a development view showing a tread pattern 30A of the pneumatic tire 10.
- the tire 10 of the present invention has a tread pattern 30 ⁇ / b> A that is a feature of the present invention formed in a tread portion T.
- the tire 10 having the tread pattern 30A can be suitably used for a passenger car tire.
- the tire 10 of the present embodiment has a predetermined tire rotation direction and is mounted on the vehicle so as to rotate in the tire rotation direction R of FIG. 2 when the vehicle moves forward.
- the tread portion T rotates from bottom to top in FIG. 2, and the position in contact with the road surface of the tread portion T moves from top to bottom in FIG. That is, the upper side in FIG. 2 is the front side in the tire rotation direction (first direction in the tire rotation direction), and the lower side in FIG. 2 is the rear side in the tire rotation direction (second direction in the tire rotation direction).
- the tire circumferential direction C refers to the rotation direction R of the tire 10 and the opposite direction, and is a direction perpendicular to the paper surface of FIG. 1 and a vertical direction of FIG.
- a first side that is the vehicle outer side and a second side that is the vehicle inner side in the tire width direction when mounted on the vehicle are predetermined.
- a direction designating unit for displaying a symbol or information designating the direction of mounting on the rim of the vehicle. 1 and 2 the right side is the first side (the tire width direction outside) which is the vehicle outer side in the tire width direction when mounted on the vehicle, and the left side is the second side (the tire width direction inner side) which is the vehicle inner side.
- the tire width direction refers to the rotation center axis direction of the tire 10 and is the left-right direction of FIGS. 1 and 2.
- the symbol CL indicates the center line of the tire.
- the tread pattern 30A contacts the road surface in a tire width direction region indicated by a contact width W in a state where the tire 10 is mounted on the vehicle.
- the distance between the outer ground end E1 and the inner ground end E2 is the ground width W.
- the ground contact ends E1 and E2 are at both ends of the ground contact surface in the tire width direction when the tire 10 is assembled to a specified rim, filled with a specified internal pressure, and grounded on a horizontal plane under the condition of 80% of the specified load. is there.
- a tread pattern 30A shown in FIG. 2 includes a first outer circumferential groove 31, a second outer circumferential groove 32, a first inner circumferential groove 33, a second inner circumferential groove 34, and a plurality of first lugs.
- the first lug groove group including the groove 41, the second lug groove group including the plurality of second lug grooves 42, the third lug groove group including the plurality of third lug grooves 43, and the plurality of fourth lug grooves 44.
- a fourth lug groove group including a plurality of fifth lug grooves 45, and a sixth lug groove group including a plurality of sixth lug grooves 46.
- the first outer circumferential groove 31, the second outer circumferential groove 32, the first inner circumferential groove 33, and the second inner circumferential groove 34 extend annularly in the tire circumferential direction.
- the first outer circumferential groove 31 is provided on the outer side in the tire width direction from the tire center line CL, and the second outer circumferential groove 32 is provided between the first outer circumferential groove 31 and the outer grounding end E1.
- the first inner circumferential groove 33 is provided on the inner side in the tire width direction with respect to the tire center line CL, and the second inner circumferential groove 34 is provided between the first inner circumferential groove 33 and the inner grounding end E2. .
- the depth of the first outer circumferential groove 31, the second outer circumferential groove 32, the first inner circumferential groove 33, and the second inner circumferential groove 34 is, for example, 8 to 10 mm, and the width is, for example, 9 It is preferably ⁇ 10 mm.
- the plurality of first lug grooves 41 are connected to the first inner circumferential groove 33 and the second inner circumferential groove 34 between the first inner circumferential groove 33 and the second inner circumferential groove 34. It is provided at intervals in the tire circumferential direction.
- Each first lug groove 41 has a bent portion 41a, a first inclined portion 41b, and a second inclined portion 41c.
- the bent portion 41 a is provided between the first inner circumferential groove 33 and the second inner circumferential groove 34.
- the position of the bent portion 41a in the tire width direction is preferably closer to the first inner circumferential groove 33 side than the second inner circumferential groove 34, and the inner side of the distance from the first inner circumferential groove 33 to the bent portion 41a.
- the ratio of the land portion 53 to the width is preferably 60 to 70%.
- the first inclined portion is provided so as to extend from the end of the first lug groove 41 on the first inner circumferential groove 33 side to the bent portion 41a in the tire rotation direction rear side and the tire width direction inner side.
- the first inclined portion 41b is preferably provided on the extension of the third lug groove 43a.
- the second inclined portion 41c is provided so as to extend from the end of the first lug groove 41 on the second inner circumferential groove 34 side to the bent portion 41a on the rear side in the tire rotation direction and on the outer side in the tire width direction.
- the angle formed between the first inclined portion 41b and the tire width direction is preferably 20 to 30 degrees.
- the angle formed by the second inclined portion 42c with the tire width direction is preferably 20 to 30 degrees.
- the angle formed by the first inclined portion 41b and the second inclined portion 41c is preferably 100 to 130 degrees.
- the depth of the bent portion 41a and the first inclined portion 41b of the first lug groove 41 is the bottom upper portion shallower than the depth of the second inclined portion 41c.
- the depth of the bent portion 41a and the first inclined portion 41b of the first lug groove 41 is preferably 20 to 30% with respect to the depth of the second inclined portion 41c.
- the depth of the second inclined portion 41c is preferably 6 to 8 mm, whereas the depth of the bent portion 41a and the first inclined portion 41b is preferably 1 to 3 mm.
- the width of the first lug groove is preferably 3 to 6 mm, for example.
- the second inclined portion 41c extends from the end of the first lug groove 41 on the second inner circumferential groove 34 side to the bent portion 41a on the rear side in the tire rotation direction, and the depth of the bent portion 41a and the first inclined portion 41b is increased. Since it is shallower than the second inclined portion 41c, the snow that has entered the second inclined portion 41c from the end on the second inner circumferential groove 34 side due to the rotation of the tire is compressed between the second inclined portion 41c and the road surface. Therefore, the snow column shear force can be increased.
- the second lug groove 42 is provided so as to extend inward in the tire width direction from the second inner circumferential groove 34.
- the angle between the second lug groove 42 and the tire width direction is preferably 1 to 5 degrees. Since the second lug groove 42 is connected to the second inner circumferential groove 34 and extends to the inner side in the tire width direction from the inner grounding end E2, the inner shoulder land on the inner side in the tire width direction from the second inner circumferential groove 34.
- the portion 55 has a block shape divided in the tire circumferential direction by the second lug groove 42. For this reason, the braking performance can be enhanced by the edge formed by the second lug groove 42.
- the second lug groove 42 may be provided with a bottom upper portion 42a that is shallower than other portions of the second lug groove 42 at the end on the second inner circumferential groove 34 side.
- the bottom upper portion 42a By providing the bottom upper portion 42a, the rigidity of the block shapes of the inner shoulder land portions 55 that are divided in the tire circumferential direction by the second lug grooves 42 can be increased.
- the depth of the bottom upper part 42a of the second lug groove 42 is preferably 20 to 30% with respect to the depth in the other part of the second lug groove 42.
- the depth of the bottom upper part 42a is preferably 1 to 3 mm, while the depth of the other part of the second lug groove 42 is preferably 6 to 8 mm.
- the plurality of third lug grooves 43 (43a, 43b) are separated from the first outer circumferential groove 31 and the first inner circumferential groove 33 between the first outer circumferential groove 31 and the first inner circumferential groove 33. This position is provided at a distance in the tire circumferential direction so as to extend from the tire rotation direction rear side and the tire width direction outer side to be connected to the first inner circumferential groove 33. Since the start end of the third lug groove 43 is separated from the first outer circumferential groove 31, the center land portion 51 between the first outer circumferential groove 31 and the first inner circumferential groove 33 is tire peripheral. It becomes a rib shape which continues in an annular shape in the direction. For this reason, the rigidity of the center land part 51 can be improved and steering stability can be improved.
- the third lug groove 43 extends from the start end to the rear side in the tire rotation direction and is connected to the first inner circumferential groove 33, the water between the third lug groove 43 and the road surface is first caused by the rotation of the tire. It can be discharged into the inner circumferential groove 33.
- the angle between the third lug groove 43 and the tire width direction is preferably 30 to 45 degrees.
- the third lug groove group preferably includes third lug grooves 43 that differ in at least one of a length in the tire width direction, a width in the tire circumferential direction, and a depth in the tire radial direction.
- FIG. 2 shows a third lug groove 43a and a third lug groove 43b having different lengths in the tire width direction, widths in the tire circumferential direction, and depths in the tire radial direction.
- the third lug groove 43 a is provided so as to face the first lug groove 41 and the first inner circumferential groove 33.
- the third lug groove 43a is longer in the tire width direction, wider in the tire circumferential direction, and deeper in the tire radial direction than the third lug groove 43b.
- the length of the third lug groove 43a in the tire width direction is preferably 12 to 20 mm, whereas the length of the third lug groove 43b in the tire width direction is preferably 9 to 16 mm.
- the width of the third lug groove 43a in the tire circumferential direction is preferably 4 to 6 mm, whereas the width of the third lug groove 43b in the tire circumferential direction is preferably 2 to 3 mm.
- the depth of the third lug groove 43a is preferably 2 to 4 mm, whereas the depth of the third lug groove 43b is preferably 3 to 6 mm.
- one third lug groove 43a and two third lug grooves 43b are alternately arranged in the tire circumferential direction.
- the length in the tire width direction is long, the width in the tire circumferential direction is wide, and the depth in the tire radial direction is deep, and the length in the tire width direction is shorter than the third lug groove 43a.
- the plurality of fourth lug grooves 44 start at positions separated from the first outer circumferential groove 31 and the second outer circumferential groove 32 between the first outer circumferential groove 31 and the second outer circumferential groove 32. And extending in the tire rotation direction rear side and the tire width direction outer side and connected to the second outer circumferential groove so as to be spaced apart in the tire circumferential direction. Since the starting end of the fourth lug groove 44 is separated from the first outer circumferential groove 31, the outer land portion 52 between the first outer circumferential groove 31 and the second outer circumferential groove 32 is tire peripheral. It becomes a rib shape which continues in an annular shape in the direction. For this reason, the rigidity of the outer land portion 52 can be increased, and the steering stability can be improved.
- the fourth lug groove 44 extends from the start end to the rear side in the tire rotation direction and is connected to the second outer circumferential groove 32, the water between the fourth lug groove 44 and the road surface is secondly caused by the rotation of the tire. It can be discharged into the outer circumferential groove 32.
- the angle between the fourth lug groove 44 and the tire width direction is preferably 20 to 40 degrees.
- the fourth lug groove group preferably includes fourth lug grooves 44 that differ in at least one of a length in the tire width direction, a width in the tire circumferential direction, and a depth in the tire radial direction.
- FIG. 2 shows a fourth lug groove 44a and a fourth lug groove 44b having different lengths in the tire width direction, widths in the tire circumferential direction, and depths in the tire radial direction.
- the fourth lug groove 44a (long lug groove) is longer in the tire width direction, wider in the tire circumferential direction, and deep in the tire radial direction than the fourth lug groove 44b (short lug groove).
- the length of the fourth lug groove 44a in the tire width direction is preferably 30 to 35 mm, while the length of the fourth lug groove 44b in the tire width direction is preferably 20 to 25 mm.
- the width of the fourth lug groove 44a in the tire circumferential direction is preferably 5 to 7 mm, whereas the width of the fourth lug groove 44b in the tire circumferential direction is preferably 2 to 3 mm.
- the depth of the fourth lug groove 44a is preferably 1 to 7 mm, whereas the depth of the fourth lug groove 44b is preferably 1 to 5 mm.
- one fourth lug groove 44a and one fourth lug groove 44b are alternately arranged in the tire circumferential direction.
- the length in the tire width direction is longer, the width in the tire circumferential direction is wider, and the length in the tire radial direction is shorter than the fourth lug groove 44a between the fourth lug grooves 44a.
- the distance between the fourth lug grooves 44a in the tire circumferential direction is approximately 1 ⁇ 2 of the distance between the first lug grooves 41 in the tire circumferential direction.
- every fourth lug groove 44a is provided at the same position as the first lug groove 41 in the tire circumferential direction and at a position between the first lug grooves 41. For this reason, the number of lug grooves in the outer land portion 52 is larger than the number of lug grooves in the inner land portion.
- the plurality of fifth lug grooves 45 are arranged in a first inner circumferential direction in a region surrounded by the first inner circumferential groove 33, the second inner circumferential groove 34, and the first lug groove (third lug groove) 41.
- a position separated from the groove 33, the second inner circumferential groove 34, and the first lug groove (third lug groove) 41 is a starting end, and extends inward in the tire rotation direction and inward in the tire width direction and extends in the second inner circumferential direction. It is provided so as to be connected to the groove 34.
- the snow that has entered the fifth lug groove 45 from the end on the second inner circumferential groove 34 side by the rotation of the tire is compressed between the fifth lug groove 45 and the road surface, thereby increasing the snow column shear force. be able to.
- the fifth lug groove 45 is provided at the same position as the third lug groove 43b in the tire circumferential direction.
- the position in the tire width direction of the start end of the fifth lug groove 45 is substantially the same as the position in the tire width direction of the bent portion 41a of the first lug groove 41, or inward in the tire width direction from the bent portion 41a. Is arranged.
- the second inclined portion 41c of the first lug groove 41 and the fifth lug groove 45 are arranged substantially in parallel.
- the angle between the fifth lug groove 45 and the tire width direction is preferably 20 to 30 degrees.
- the position of the start end of the fifth lug groove 45 in the tire width direction is preferably closer to the first inner circumferential groove 33 than the second inner circumferential groove 34.
- the distance from the first inner circumferential groove 33 to the bent portion 41a is preferably 60 to 70% of the width of the inner land portion 53.
- the depth of the fifth lug groove 45 is preferably 6 to 8 mm, for example, and the width of the fifth lug groove 45 is preferably 3 to 6 mm, for example.
- one first lug groove 41 and two fifth lug grooves 45 are alternately arranged in the tire circumferential direction. Between the first lug grooves 41 that divide the inner land portion 53 in the tire circumferential direction, a fifth lug groove 45 whose start end is separated from the first inner circumferential groove 33 is arranged. The strength of the block can be maintained.
- the plurality of sixth lug grooves 46 are provided so as to extend outward in the tire width direction with a start position at a position spaced outward from the second outer circumferential groove 32 in the tire width direction.
- the angle between the sixth lug groove 46 and the tire width direction is preferably 5 to 20 degrees.
- the distance from the start end of the sixth lug groove 46 to the second outer circumferential groove 32 is preferably 15 to 20% of the distance from the second outer circumferential groove 32 to the outer grounding end E1.
- the depth of the sixth lug groove 46 is preferably 1 to 7 mm, for example, and the width of the sixth lug groove 46 is preferably 4 to 6 mm, for example.
- the outer shoulder land portion 54 on the outer side in the tire width direction than the second outer circumferential groove 32 is annular in the tire circumferential direction. It becomes a continuous rib shape.
- the land portion (the outer half of the center land portion 51, the outer land portion 52, the outer shoulder land portion) outside the tire center line CL in the tire width direction (right side in FIG. 2).
- 54 has a rib shape that is continuous in the tire circumferential direction, so that the steering stability can be enhanced at the outer portion in the tire width direction.
- the third lug groove 43 extends from the start end to the rear side in the tire rotation direction and is connected to the first inner circumferential groove 33
- the fourth lug groove 44 extends from the start end to the rear side in the tire rotation direction. Since it is connected to the groove 32, the drainage performance can be enhanced.
- a block in which the land portion (the inner half of the center land portion 51, the inner land portion 53, the inner shoulder land portion 55) on the inner side in the tire width direction (left side in FIG. 2) from the tire center line CL is divided in the tire circumferential direction. It has a shape. For this reason, the edge of a land part can be increased. Further, the snow column shear force can be increased by the first lug groove (third lug groove) 41 and the fifth lug groove 45, and the braking performance on snow can be improved.
- FIG. 3 is a development view showing a tread pattern 30B according to the second embodiment of the present invention.
- symbol is attached
- the corner portion formed by the tread surface of the inner land portion 53 and the first inner circumferential groove 33 is chamfered by the first inclined surface 61.
- the first inclined surface 61 is provided at an acute corner formed by the first inner circumferential groove 33 and the first inclined portion 41b of the first lug groove 41, and the tread surface of the inner land portion 53, the first inner periphery It intersects the side wall of the direction groove 33 and the side wall of the first inclined portion 41 b of the first lug groove 41.
- the width of the first inclined surface 61 in the tire width direction is preferably 2 to 4 mm
- the length in the tire circumferential direction is 30 to 50 mm
- the depth in the tire radial direction is preferably 1 to 2 mm.
- chamfering by the second inclined surface 62 is performed on a corner portion formed by the tread surface of the inner land portion 53 and the second inner circumferential groove 34.
- the second inclined surface 62 is provided at an acute corner formed by the second inner circumferential groove 34 and the second inclined portion 41 c of the first lug groove 41, and the tread surface of the inner land portion 53, the second inner periphery. It intersects with the side wall of the directional groove 34 and the side wall of the second inclined portion 41 c of the first lug groove 41.
- the edge by the side wall can be increased and the braking performance can be improved.
- the width of the second inclined surface 62 in the tire width direction is 1 to 3 mm
- the length in the tire circumferential direction is 10 to 20 mm
- the depth in the tire radial direction is 1 to 2 mm. .
- chamfering by the third inclined surface 63 is performed on the corner formed by the tread surface of the center land portion 51 and the side wall of the first inner circumferential groove 33.
- the third inclined surface 63 is provided at an acute corner formed by the first inner circumferential groove 31 and the third lug groove 43, the tread surface of the center land portion 51, the side wall of the first inner circumferential groove 33, And, it intersects with the side wall of the third lug groove 43.
- the width of the third inclined surface 63 in the tire width direction is preferably 1 to 3 mm
- the length in the tire circumferential direction is 10 to 20 mm
- the depth in the tire radial direction is preferably 1 to 2 mm.
- the corner portion formed by the tread surface of the outer land portion 52 and the side wall of the second outer circumferential groove 32 is chamfered by the fourth inclined surface 64.
- the fourth inclined surface 64 is provided at an acute corner formed by the second inner circumferential groove 32 and the fourth lug groove 44, the tread surface of the outer land portion 52, the side wall of the second outer circumferential groove 32, and , Intersects the side wall of the fourth lug groove 44.
- the width of the fourth inclined surface 64 in the tire width direction is preferably 1 to 3 mm
- the length in the tire circumferential direction is 7 to 15 mm
- the depth in the tire radial direction is preferably 1 to 2 mm.
- chamfering by the fifth inclined surface 65 is performed on the corner formed by the tread surface of the inner land portion 53 and the side wall of the second inner circumferential groove 34.
- the fifth inclined surface 65 is provided at an acute corner formed by the second inner circumferential groove 34 and the fifth lug groove 45, and the tread surface of the inner land portion 53, the side wall of the second inner circumferential groove 34, and , Intersects the side wall of the fifth lug groove 45.
- the width of the fifth inclined surface 65 in the tire width direction is preferably 1 to 3 mm
- the length in the tire circumferential direction is 10 to 20 mm
- the depth in the tire radial direction is preferably 1 to 2 mm.
- the second outer circumferential groove 32 has a sidewall in the tire width direction outer side of the second outer circumferential groove 32 at a position in the tire circumferential direction corresponding to the start end of each sixth lug groove 46.
- a notch 66 that is recessed outward in the tire width direction and spaced apart from the sixth lug groove 46 in the tire width direction is provided.
- the notch 66 preferably has a width in the tire width direction of 1 to 3 mm, a length in the tire circumferential direction of 10 to 20 mm, and a depth in the tire radial direction of 1 to 2 mm.
- FIG. 4 is a development view showing a tread pattern 30C according to the third embodiment of the present invention.
- symbol is attached
- the start end of the fourth lug groove 44b having a short length in the tire width direction and the first outer circumferential groove.
- a first sipe 71 is provided to connect to the first sipe 71.
- the first sipe 71 includes a bent portion 71a between the start end of the fourth lug groove 44b and the first outer circumferential groove 31, a tire rotation direction front side and a tire width from the start end of the fourth lug groove 44b to the bent portion 71a.
- the outer land portion 52 is partitioned in the tire circumferential direction, and in the portion partitioned by the first sipe 71, a convex portion 52a that protrudes forward in the tire rotation direction, and the tire rotation direction rearward.
- a concave portion 52b is formed.
- the depth of the first sipe in the tire radial direction is preferably 6 to 8 mm.
- a second sipe 72 extending from the second outer circumferential groove 32 to the ground contact end E2 on the outer side in the tire width direction.
- the second sipe 72 has a curved shape having a plurality of bent portions on the tread surface.
- the outer shoulder land portion 54 is partitioned in the tire circumferential direction, and in the portion partitioned by the second sipe 72, a convex portion 54a that protrudes forward in the tire rotation direction, and the tire rotation direction.
- a recessed portion 54b that is recessed backward is formed.
- the depth of the second sipe in the tire radial direction is preferably 1 to 7 mm.
- a seventh lug groove group including a plurality of seventh lug grooves 47 is provided between the plurality of second lug grooves 42 in the tire circumferential direction.
- the start end of the seventh lug groove 47 is located at a position spaced inward in the tire width direction from the second inner circumferential groove 34, and the seventh lug groove 47 extends inward in the tire width direction from the start end.
- the distance from the start end of the seventh lug groove 47 to the second inner circumferential groove 34 is 35 to 45% of the distance from the second inner circumferential groove 34 to the inner grounding end E2. preferable.
- the depth of the seventh lug groove 47 is preferably 1 to 7 mm, for example, and the width of the seventh lug groove 47 is preferably 1 to 3 mm, for example.
- a third sipe 73 that connects the start end of the seventh lug groove 47 and the second inner circumferential groove 34 is further provided.
- the third sipe 73 includes a bent portion 73a between the start end of the seventh lug groove 47 and the second inner circumferential groove 34, the tire rotation direction rear side from the start end of the seventh lug groove 47 to the bent portion 73a, and the tire
- the first straight portion 73b extends outward in the width direction
- the second straight portion 73c extends from the bent portion 73a to the end on the second inner circumferential groove 34 side, extending forward in the tire rotation direction and outward in the tire width direction.
- the depth of the third sipe in the tire radial direction is preferably 6 to 8 mm.
- each block of the inner shoulder land portion 55 is partitioned in the tire circumferential direction, and a portion partitioned by the third sipe 73 includes a recess 55a that is recessed forward in the tire rotation direction, and the tire.
- a convex portion 55b that is convex backward in the rotation direction is formed.
- the center land portion 51 is further provided with a fourth sipe 74 that connects the start end of the third lug groove 43 and the first outer circumferential groove 31. Also good.
- a fifth sipe 75 may be provided in the inner land portion 53 in a direction intersecting the first lug groove 41 or the fifth lug groove 45.
- the fifth sipe 75 is provided so as to extend from the inner end in the tire width direction to the outer side in the tire width direction and the front side in the tire rotation direction.
- the length of the first lug groove 41 is formed in the bottom upper portion (the bent portion 41 a and the first inclined portion 41 b) shallower than the second inclined portion 41 c of the first lug groove 41.
- a sixth sipe may be provided in the vertical direction.
- the edge can be increased and the braking performance can be improved.
- the first sipe 71 and the second sipe 72 are provided with convex portions 52a and 54a that are convex forward in the tire rotation direction on the land portion on the outer side in the tire width direction.
- the braking performance can be enhanced by providing the land portion on the inner side in the tire width direction with the recessed portion 55a that is recessed forward in the tire rotation direction.
- the tire size was 245 / 40R18.
- Comparative Example 1 a tire in which the center land portion has a rib shape and the outer land portion and the inner land portion have a block shape is used.
- Example 1 a tire in which the center land portion and the outer land portion have a rib shape and the inner land portion has a block shape was used.
- Example 2 as in FIG. 3, a tire obtained by chamfering the inclined surface of the tire of Example 1 was used.
- Example 3 as in FIG. 4 a tire provided with sipes on the tire of Example 2 was used.
- DRY steering stability, WET steering stability, and SNOW braking performance were evaluated as follows.
- the sensory evaluation was evaluated based on 100 points, and the evaluation results of each example were indexed with the sensory evaluation result of the comparative example as the index 100 (standard). The higher the index, the better the handling stability and braking performance.
- Example 1 Comparing Comparative Example 1 with Examples 1 to 3, in Example 1, the outer land portion has a rib shape, so that all of DRY steering stability, WET steering stability, and SNOW braking performance are improved. I understand that.
- Example 1 and Example 2 it can be seen that the chamfering increases the groove area and improves the WET handling stability and SNOW braking performance. Comparing Example 2 and Example 3, it can be seen that providing a sipe further improves WET handling stability and SNOW braking performance.
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Abstract
Description
このように相反する要求を満たすため、トレッド部に設けられるタイヤ周方向溝の幅や数、ラグ溝の傾斜角度や幅の工夫が行われている(例えば、特許文献1参照)。
一方、周方向溝の間の陸部をラグ溝によりタイヤ周方向に分断しブロック形状とすると、エッジが増加し、制動性能が高まる。しかし、陸部の剛性が低下し、操縦安定性が低下する。
前記トレッドパターンは、
タイヤセンターラインに対して第1の側に位置し、タイヤ周方向に並行する第1外側周方向溝と、
前記第1外側周方向溝に対して第1の側に位置し、タイヤ周方向に並行する第2外側周方向溝と、
タイヤセンターラインに対して第2の側に位置し、タイヤ周方向に並行する第1内側周方向溝と、
前記第1内側周方向溝に対して第2の側に位置し、タイヤ周方向に並行する第2内側周方向溝と、
前記第1内側周方向溝と前記第2内側周方向溝との間の内側陸部をタイヤ周方向に分断する複数の第1ラグ溝からなる第1ラグ溝群と、
前記第2内側周方向溝に対してタイヤ幅方向内側に位置する内側ショルダー陸部をタイヤ周方向に分断する複数の第2ラグ溝からなる第2ラグ溝群と、を備え、
前記第1外側周方向溝と前記第1内側周方向溝との間のセンター陸部、前記第1外側周方向溝と前記第2外側周方向溝との間の外側陸部、および、前記第2外側周方向溝よりもタイヤ幅方向外側の外側ショルダー陸部は、タイヤ周方向に環状に連続する連続陸部となっている。
前記第3ラグ溝群は、タイヤ幅方向の長さ、タイヤ周方向の幅、又はタイヤ径方向の深さの少なくとも1つが異なる第3ラグ溝を含む、ことが好ましい。
前記第4ラグ溝群は、タイヤ幅方向の長さ、タイヤ周方向の幅、又はタイヤ径方向の深さの少なくとも1つが異なる複数種類の第4ラグ溝を含む、ことが好ましい。
前記鋭角の角部には、前記内側陸部の踏面、前記第1内側周方向溝もしくは前記第2内側周方向溝の側壁、および、前記第1ラグ溝の側壁と交差する傾斜面による面取りが施されている、ことが好ましい。
前記鋭角の角部には、前記センター陸部の踏面、前記第1内側周方向溝の側壁、および、前記第3ラグ溝の側壁と交差する傾斜面による面取りが施されている、ことが好ましい。
前記鋭角の角部には、前記外側陸部の踏面、前記第2外側周方向溝の側壁、および、前記第4ラグ溝の側壁と交差する傾斜面による面取りが施されている、ことが好ましい。
前記鋭角の角部には、前記内側陸部の踏面、前記第2内側周方向溝の側壁、および、前記第5ラグ溝の側壁と交差する傾斜面による面取りが施されている、ことが好ましい。
前記短い第4ラグ溝の開始端と前記第1外側周方向溝とを接続し、前記外側陸部をタイヤ周方向に区画する第1サイプがさらに設けられ、
前記第1サイプは、前記第4ラグ溝の開始端と前記第1外側周方向溝との間の屈曲部、前記短いラグ溝の開始端から前記屈曲部までタイヤ回転方向の第1の方向かつタイヤ幅方向内側に延びる第1直線部、および、前記屈曲部から前記第1外側周方向溝側の端部までタイヤ回転方向の第1の方向とは反対の第2の方向かつタイヤ幅方向内側に延びる第2直線部と、からなり、
前記第1サイプによりタイヤ周方向に区画される前記外側陸部の各部分は、タイヤ回転方向の第1の方向に凸となる凸部を有する、ことが好ましい。
前記第2サイプは、トレッド面において複数の屈曲部を有する曲線形状であり、
前記第2サイプによりタイヤ周方向に区画される前記外側ショルダー陸部の各部分は、タイヤ回転方向の第1の方向に凸となる凸部を有する、ことが好ましい。
前記第7ラグ溝の開始端と前記第2内側周方向溝とを接続する第3サイプがさらに設けられ、
前記第3サイプは、前記第7ラグ溝の開始端と前記第2内側周方向溝との間の屈曲部、前記第7ラグ溝の開始端から前記屈曲部までタイヤ回転方向の第1の方向とは反対の第2の方向かつタイヤ幅方向外側に延びる第1直線部、および、前記屈曲部から前記第2内側周方向溝側の端部までタイヤ回転方向の第1の方向かつタイヤ幅方向外側に延びる第2直線部と、からなり、
前記第3サイプによりタイヤ周方向に分断される前記内側ショルダー陸部の各部分は、タイヤ回転方向の第2の方向に凸となる凸部を有する、ことが好ましい。
前記第1ラグ溝は、
前記第1内側周方向溝からタイヤ回転方向後側かつタイヤ幅方向内側に延びる第1傾斜部と、
前記第2内側周方向溝側からタイヤ回転方向後側かつタイヤ幅方向外側に延びる第2傾斜部と、
前記第1傾斜部と前記第2傾斜部とが交わる屈曲部とを有することが好ましい。
〔第1実施形態〕
(タイヤの全体説明)
以下、本実施形態の空気入りタイヤについて説明する。図1は、本実施形態の空気入りタイヤ(以降、タイヤという)10の断面を示すタイヤ断面図である。
タイヤ10は、例えば、乗用車用タイヤである。乗用車用タイヤは、JATMA YEAR BOOK 2012(日本自動車タイヤ協会規格)のA章に定められるタイヤをいう。この他、B章に定められる小型トラック用タイヤおよびC章に定められるトラック及びバス用タイヤに適用することもできる。
以降で具体的に説明する各パターン要素の寸法の数値は、乗用車用タイヤにおける数値例であり、本発明である空気入リタイヤはこれらの数値例に限定されない。
タイヤ10は、骨格材として、一対のビードコア11と、カーカスプライ層12と、ベルト層14とを有し、これらの骨格材の周りに、トレッドゴム部材18と、サイドゴム部材20と、ビードフィラーゴム部材22と、リムクッションゴム部材24と、インナーライナゴム部材26と、を主に有する。
カーカスプライ層12は、有機繊維をゴムで被覆した1又は複数のカーカスプライ材12a、12bからなる。カーカスプライ材12a、12bは、一対のビードコア11の間に巻き回すことによりトロイダル形状に形成されている。
ベルト層14は複数のベルト材14a、14bからなり、カーカスプライ層12のタイヤ径方向外側にタイヤ周方向に巻き回されている。タイヤ径方向内側のベルト材14aのタイヤ幅方向の幅は、タイヤ径方向外側のベルト材14bの幅に比べて広い。
ベルト材14a、14bは、スチールコードにゴムを被覆した部材である。ベルト材14aのスチールコード、および、ベルト材14bのスチールコードは、タイヤ周方向に対して所定の角度、例えば20~30度傾斜して配置されている。ベルト材14aのスチールコードと、ベルト材14bのスチールコードとは、タイヤ周方向に対して互いに逆方向に傾斜し、互いに交錯する。ベルト層14は充填された空気圧によるカーカスプライ層12の膨張を抑制する。
この他に、タイヤ10は、ベルト層14のタイヤ径方向外側面を覆うベルトカバー層28を備える。ベルトカバー層28は、有機繊維と、この有機繊維を被覆するゴムとからなる。
本実施形態において、タイヤ周方向Cとはタイヤ10の回転方向Rおよびその反対方向をいい、図1の紙面に垂直な方向および図2の上下方向である。
ここで、外側接地端E1と内側接地端E2の間隔が接地幅Wである。接地端E1、E2は、タイヤ10を規定リムに組み付け、規定内圧を充填し、規定荷重の80%を負荷荷重とした条件において水平面に接地させたときの接地面のタイヤ幅方向の両端部である。
第1外側周方向溝31、第2外側周方向溝32、第1内側周方向溝33、および、第2内側周方向溝34の深さは、例えば8~10mmであり、幅は、例えば9~10mmであることが好ましい。
第1傾斜部は、第1ラグ溝41の第1内側周方向溝33側の端部から屈曲部41aまでタイヤ回転方向後側かつタイヤ幅方向内側に延びるように設けられている。第1傾斜部41bは、第3ラグ溝43aの延長上に設けられていることが好ましい。
第2傾斜部41cは、第1ラグ溝41の第2内側周方向溝34側の端部から屈曲部41aまでタイヤ回転方向後側かつタイヤ幅方向外側に延びるように設けられている。
第1傾斜部41bのタイヤ幅方向とのなす角は、20~30度であることが好ましい。また、第2傾斜部42cのタイヤ幅方向とのなす角は、20~30度であることが好ましい。さらに、第1傾斜部41bと第2傾斜部41cとのなす角は、100~130度であることが好ましい。これにより、タイヤの回転によって第1ラグ溝41に入り込んだ雪が第2内側周方向溝34側の端部から屈曲部41aに至る第1ラグ溝41と路面との間の空間で圧縮されるため、雪柱せん断力を高めることができる。
第2傾斜部41cが第1ラグ溝41の第2内側周方向溝34側の端部から屈曲部41aまでタイヤ回転方向後側に延びるとともに、屈曲部41aおよび第1傾斜部41bの深さが第2傾斜部41cよりも浅くなっているため、タイヤの回転によって第2内側周方向溝34側の端部から第2傾斜部41cに入り込んだ雪が第2傾斜部41cと路面との間で圧縮されるため、雪柱せん断力を高めることができる。
なお、第2ラグ溝42には、第2内側周方向溝34側の端部に、第2ラグ溝42の他の部分よりも浅い底上部42aが設けられていてもよい。底上部42aを設けることで、第2ラグ溝42によってタイヤ周方向に分断される内側ショルダー陸部55のブロック形状同士の剛性を高めることができる。具体的には、第2ラグ溝42の底上部42aの深さが、第2ラグ溝42の他の部分における深さに対して、20~30%であることが好ましい。例えば、底上部42aの深さが1~3mmであるのに対して、第2ラグ溝42の他の部分の深さが6~8mmであることが好ましい。
第3ラグ溝43は、開始端からタイヤ回転方向後側に延び第1内側周方向溝33と接続されているため、タイヤの回転によって第3ラグ溝43と路面との間の水を第1内側周方向溝33に排出することができる。排水性能を確保するため、第3ラグ溝43のタイヤ幅方向とのなす角は、30~45度であることが好ましい。
本実施形態においては、1本の第3ラグ溝43aと2本の第3ラグ溝43bとが、タイヤ周方向に交互に配列されている。タイヤ幅方向の長さが長く、タイヤ周方向の幅が広く、タイヤ径方向の深さが深い第3ラグ溝43aの間に、第3ラグ溝43aよりもタイヤ幅方向の長さが短く、タイヤ周方向の幅が狭く、タイヤ径方向の深さが浅い2本の第3ラグ溝43bを配置することで、センター陸部51の強度を維持することができる。
第4ラグ溝44は、開始端からタイヤ回転方向後側に延び第2外側周方向溝32と接続されているため、タイヤの回転によって第4ラグ溝44と路面との間の水を第2外側周方向溝32に排出することができる。排水性能を確保するため、第4ラグ溝44のタイヤ幅方向とのなす角は、20~40度であることが好ましい。
本実施形態においては、1本の第4ラグ溝44aと1本の第4ラグ溝44bとが、タイヤ周方向に交互に配列されている。タイヤ幅方向の長さが長く、タイヤ周方向の幅が広く、タイヤ径方向の深さが深い第4ラグ溝44aの間に、第4ラグ溝44aよりもタイヤ幅方向の長さが短く、タイヤ周方向の幅が狭く、タイヤ径方向の深さが浅い第4ラグ溝44bを配置することで、外側陸部52の強度を維持することができる。
第4ラグ溝44a同士のタイヤ周方向の間隔は、第1ラグ溝41のタイヤ周方向の間隔のほぼ1/2となっている。本実施形態においては、第4ラグ溝44aは、1つおきに、タイヤ周方向において第1ラグ溝41と同じ位置、および、第1ラグ溝41同士の間の位置に設けられている。このため、外側陸部52におけるラグ溝の数は、内側陸部におけるラグ溝の数よりも多くなっている。
本実施形態においては、第5ラグ溝45は、タイヤ周方向において第3ラグ溝43bと同じ位置に設けられている。
本実施形態において、第5ラグ溝45の開始端のタイヤ幅方向の位置は、第1ラグ溝41の屈曲部41aのタイヤ幅方向の位置とほぼ同一か、屈曲部41aよりもタイヤ幅方向内側に配置されている。第1ラグ溝41の第2傾斜部41cと第5ラグ溝45とはほぼ平行に配置されている。具体的には、第5ラグ溝45のタイヤ幅方向とのなす角は、20~30度であることが好ましい。
第5ラグ溝45の開始端のタイヤ幅方向の位置は、第2内側周方向溝34よりも第1内側周方向溝33側であることが好ましい。具体的には、第1内側周方向溝33から屈曲部41aまでの距離は、内側陸部53の幅の60~70%であることが好ましい。第5ラグ溝45の深さは、例えば6~8mmであり、第5ラグ溝45の幅は、例えば3~6mmであることが好ましい。
本実施形態においては、1本の第1ラグ溝41と2本の第5ラグ溝45とが、タイヤ周方向に交互に配列されている。内側陸部53をタイヤ周方向に分断する第1ラグ溝41の間に、開始端が第1内側周方向溝33から離間した第5ラグ溝45を配置することで、内側陸部53の各ブロックの強度を維持することができる。
第6ラグ溝46の開始端が第2外側周方向溝32から離間していることで、第2外側周方向溝32よりもタイヤ幅方向外側の外側ショルダー陸部54がタイヤ周方向に環状に連続するリブ形状となる。
図3は本発明の第2の実施形態に係るトレッドパターン30Bを示す展開図である。なお、第1実施形態と同様の構成については同符号を付して説明を割愛する。
面取りを施すことにより、第1傾斜面61と内側陸部53の踏面によるエッジ、第1傾斜面61と第1内側周方向溝33の側壁によるエッジ、第1傾斜面61と第1ラグ溝(第3ラグ溝)41の側壁によるエッジを増加させ、制動性能を高めることができる。
上記の効果を得るために、第1傾斜面61のタイヤ幅方向の幅は2~4mm、タイヤ周方向の長さは30~50mm、タイヤ径方向の深さは1~2mmであることが好ましい。
上記の効果を得るために、第2傾斜面62のタイヤ幅方向の幅は1~3mm、タイヤ周方向の長さは10~20mm、タイヤ径方向の深さは1~2mmであることが好ましい。
上記の効果を得るために、第3傾斜面63のタイヤ幅方向の幅は1~3mm、タイヤ周方向の長さは10~20mm、タイヤ径方向の深さは1~2mmであることが好ましい。
上記の効果を得るために、第4傾斜面64のタイヤ幅方向の幅は1~3mm、タイヤ周方向の長さは7~15mm、タイヤ径方向の深さは1~2mmであることが好ましい。
上記の効果を得るために、第5傾斜面65のタイヤ幅方向の幅は1~3mm、タイヤ周方向の長さは10~20mm、タイヤ径方向の深さは1~2mmであることが好ましい。
上記の効果を得るために、切り欠き66のタイヤ幅方向の幅は1~3mm、タイヤ周方向の長さは10~20mm、タイヤ径方向の深さは1~2mmであることが好ましい。
図4は本発明の第3の実施形態に係るトレッドパターン30Cを示す展開図である。なお、第2実施形態と同様の構成については同符号を付して説明を割愛する。
第1サイプ71は、第4ラグ溝44bの開始端と第1外側周方向溝31との間の屈曲部71a、第4ラグ溝44bの開始端から屈曲部71aまでタイヤ回転方向前側かつタイヤ幅方向内側に延びる第1直線部71b、および、屈曲部71aから第1外側周方向溝31側の端部までタイヤ回転方向後側かつタイヤ幅方向内側に延びる第2直線部71cと、からなる。第1サイプ71が設けられることにより、外側陸部52はタイヤ周方向に区画され、第1サイプ71により区画された部分には、タイヤ回転方向前方に凸となる凸部52a、タイヤ回転方向後方に凹となる凹部52bが形成される。
第1サイプのタイヤ径方向の深さは6~8mmであることが好ましい。
第2サイプのタイヤ径方向の深さは1~7mmであることが好ましい。
本実施形態においては、第7ラグ溝47の開始端と第2内側周方向溝34とを接続する第3サイプ73がさらに設けられている。
第3サイプ73は、第7ラグ溝47の開始端と第2内側周方向溝34との間の屈曲部73a、第7ラグ溝47の開始端から屈曲部73aまでタイヤ回転方向後側かつタイヤ幅方向外側に延びる第1直線部73b、および、屈曲部73aから第2内側周方向溝34側の端部までタイヤ回転方向前側かつタイヤ幅方向外側に延びる第2直線部73cとからなる。
第3サイプのタイヤ径方向の深さは6~8mmであることが好ましい。
第3サイプ73が設けられることにより、内側ショルダー陸部55の各ブロックはタイヤ周方向に区画され、第3サイプ73により区画された部分には、タイヤ回転方向前方に凹となる凹部55a、タイヤ回転方向後方に凸となる凸部55bが形成される。
また、本実施形態において、図4に示すように、内側陸部53に、第1ラグ溝41又は第5ラグ溝45と交差する方向に第5サイプ75を設けてもよい。第5サイプ75は、タイヤ幅方向内側の端部から、タイヤ幅方向外側かつタイヤ回転方向前側に延びるように設けられる。
また、本実施形態において、図4に示すように、第1ラグ溝41の第2傾斜部41cよりも浅い底上部(屈曲部41aおよび第1傾斜部41b)に、第1ラグ溝41の長さ方向に第6サイプを設けてもよい。
また、第1サイプ71および第2サイプ72により、タイヤ幅方向外側の陸部にタイヤ回転方向前方に凸となる凸部52a、54aを設けることで、操縦安定性を維持する一方、第3サイプ73により、タイヤ幅方向内側の陸部にタイヤ回転方向前方に凹となる凹部55aを設けることで、制動性能を高めることができる。
本発明のタイヤ10のトレッドパターン30A、30B、30Cの効果を調べるために、以下の表1に示す仕様のトレッドパターンを設けたタイヤを作製し、タイヤ性能を評価した。
比較例1では、センター陸部がリブ形状、外側陸部および内側陸部がブロック形状としたタイヤを用いた。
実施例1では、図2と同様に、センター陸部および外側陸部がリブ形状、内側陸部がブロック形状としたタイヤを用いた。
実施例2では、図3と同様に、実施例1のタイヤに傾斜面による面取りを施したタイヤを用いた。
実施例3では、図4と同様に、実施例2のタイヤにサイプを設けたタイヤを用いた。
以上の試作したタイヤのタイヤ性能として、DRY操縦安定性、WET操縦安定性、SNOW制動性能を下記のようにして評価した。
上記タイヤを装着した乗用車を試験コース上の乾燥路面を走行させてドライバーによる操縦安定性能の官能評価を行った。
上記タイヤを装着した乗用車を試験コース上の水深10mmの水膜を設けた路面を走行させてドライバーによる操縦安定性能の官能評価を行った。
上記タイヤを装着した乗用車を試験コース上の積雪路面を走行させてドライバーによる操縦安定性能の官能評価を行った。
評価結果を、表1に示す。
実施例2と実施例3とを比較すると、サイプを設けることで、WET操縦安定性、SNOW制動性能がさらに向上することがわかる。
CL センターライン
E1、E2 接地端
R タイヤ回転方向
T トレッド部
W 接地幅
10 タイヤ
11 ビードコア
12 カーカスプライ層
14 ベルト層
14a,14b ベルト材
18 トレッドゴム部材
18a 第1トレッドゴム部材
18b 第2トレッドゴム部材
20 サイドゴム部材
22 ビードフィラーゴム部材
24 リムクッションゴム部材
26 インナーライナゴム部材
30A、30B、30C トレッドパターン
31 第1外側周方向溝
32 第2外側周方向溝
33 第1内側周方向溝
34 第2内側周方向溝
41 第1ラグ溝
41a 屈曲部
41b 第1傾斜部
41c 第2傾斜部
42 第2ラグ溝
42a 底上部
43、43a、43b 第3ラグ溝
44、44a、44b 第4ラグ溝
45 第5ラグ溝
46 第6ラグ溝
47 第7ラグ溝
51 センター陸部
52 外側陸部
53 内側陸部
54 外側ショルダー陸部
55 内側ショルダー陸部
61 第1傾斜面
62 第2傾斜面
63 第3傾斜面
64 第4傾斜面
65 第5傾斜面
71 第1サイプ
71a 屈曲部
71b 第1直線部
71c 第2直線部
72 第2サイプ
73 第3サイプ
73a 屈曲部
73b 第1直線部
73c 第2直線部
74 第4サイプ
75 第5サイプ
76 第6サイプ
Claims (20)
- トレッド部にトレッドパターンが形成され、車両への装着時に車両外側となるタイヤ幅方向の第1の側および車両内側となるタイヤ幅方向の第2の側が指定された空気入りタイヤであって、前記トレッドパターンは、
タイヤセンターラインに対して第1の側に位置し、タイヤ周方向に並行する第1外側周方向溝と、
前記第1外側周方向溝に対して第1の側に位置し、タイヤ周方向に並行する第2外側周方向溝と、
タイヤセンターラインに対して第2の側に位置し、タイヤ周方向に並行する第1内側周方向溝と、
前記第1内側周方向溝に対して第2の側に位置し、タイヤ周方向に並行する第2内側周方向溝と、
前記第1内側周方向溝と前記第2内側周方向溝との間の内側陸部をタイヤ周方向に分断する複数の第1ラグ溝からなる第1ラグ溝群と、
前記第2内側周方向溝に対してタイヤ幅方向内側に位置する内側ショルダー陸部をタイヤ周方向に分断する複数の第2ラグ溝からなる第2ラグ溝群と、を備え、
前記第1外側周方向溝と前記第1内側周方向溝との間のセンター陸部、前記第1外側周方向溝と前記第2外側周方向溝との間の外側陸部、および、前記第2外側周方向溝よりもタイヤ幅方向外側の外側ショルダー陸部は、タイヤ周方向に環状に連続する連続陸部となっている、空気入りタイヤ。 - 前記第1外側周方向溝と前記第1内側周方向溝との間にあって、かつ、前記第1外側周方向溝および前記第1内側周方向溝から離間した位置を開始端とし、前記第1内側周方向溝と接続される第3ラグ溝が複数設けられた第3ラグ溝群をさらに備え、
前記第3ラグ溝群は、タイヤ幅方向の長さ、タイヤ周方向の幅、又はタイヤ径方向の深さの少なくとも1つが異なる第3ラグ溝を含む、請求項1に記載の空気入りタイヤ。 - 前記第1外側周方向溝と前記第2外側周方向溝との間にあって、かつ、前記第1外側周方向溝および前記第2外側周方向溝から離間した位置を開始端とし、前記第2外側周方向溝と接続される第4ラグ溝が複数設けられた第4ラグ溝群をさらに備え、
前記第4ラグ溝群は、タイヤ幅方向の長さ、タイヤ周方向の幅、又はタイヤ径方向の深さの少なくとも1つが異なる複数種類の第4ラグ溝を含む、請求項1又は2に記載の空気入りタイヤ。 - 前記第1内側周方向溝と前記第2内側周方向溝との間にあって、かつ、前記第1内側周方向溝、前記第2内側周方向溝、および、前記第1ラグ溝から離間した位置を開始端とし、前記第2内側周方向溝と接続される第5ラグ溝が複数設けられた第5ラグ溝群をさらに備える、請求項1~3のいずれか一項に記載の空気入りタイヤ。
- 前記第2外側周方向溝からタイヤ幅方向外側に離間した位置を開始端とし、タイヤ幅方向外側に延びる第6ラグ溝が複数設けられた第6ラグ溝群をさらに備える、請求項1~4のいずれか一項に記載の空気入りタイヤ。
- 前記内側陸部には、前記第1内側周方向溝又は前記第2内側周方向溝と前記第1ラグ溝とにより鋭角の角部が形成され、
前記鋭角の角部には、前記内側陸部の踏面、前記第1内側周方向溝もしくは前記第2内側周方向溝の側壁、および、前記第1ラグ溝の側壁と交差する傾斜面による面取りが施されている、請求項1~5のいずれか一項に記載の空気入りタイヤ。 - 前記センター陸部には、前記第1内側周方向溝と前記第3ラグ溝とにより鋭角の角部が形成され、
前記鋭角の角部には、前記センター陸部の踏面、前記第1内側周方向溝の側壁、および、前記第3ラグ溝の側壁と交差する傾斜面による面取りが施されている、請求項2に記載の空気入りタイヤ。 - 前記外側陸部には、前記第2外側周方向溝と前記第4ラグ溝とにより鋭角の角部が形成され、前記鋭角の角部には前記外側陸部の踏面、前記第2外側周方向溝の側壁、および、前記第4ラグ溝の側壁と交差する傾斜面による面取りが施されている、請求項3に記載の空気入りタイヤ。
- 前記内側陸部には、前記第2内側周方向溝と前記第5ラグ溝とにより鋭角の角部が形成され、前記鋭角の角部には前記内側陸部の踏面、前記第2内側周方向溝の側壁、および、前記第5ラグ溝の側壁と交差する傾斜面による面取りが施されている、請求項4に記載の空気入りタイヤ。
- 前記第2外側周方向溝には、前記各第6ラグ溝のタイヤ幅方向内側の開始端と対応するタイヤ周方向の位置に、第2外側周方向溝32のタイヤ幅方向外側の側壁からタイヤ幅方向外側に凹み、かつ前記第6ラグ溝の開始端に対してタイヤ幅方向内側に離間した切り欠きが設けられている、請求項5に記載の空気入りタイヤ。
- 前記第4ラグ溝群は、長いラグ溝と、タイヤ幅方向の長さが前記長いラグ溝より短いラグ溝とを有し、前記長いラグ溝と前記短いラグ溝とがタイヤ周方向に交互に配列され、
前記短いラグ溝の開始端と前記第1外側周方向溝とを接続し、前記外側陸部をタイヤ周方向に区画する第1サイプがさらに設けられ、
前記第1サイプは、前記短いラグ溝の開始端と前記第1外側周方向溝との間の屈曲部、前記短いラグ溝の開始端から前記屈曲部までタイヤ回転方向の第1の方向かつタイヤ幅方向内側に延びる第1直線部、および、前記屈曲部から前記第1外側周方向溝側の端部までタイヤ回転方向の第1の方向とは反対の第2の方向かつタイヤ幅方向内側に延びる第2直線部と、からなり、
前記第1サイプによりタイヤ周方向に区画される前記外側陸部の各部分は、タイヤ回転方向の第1の方向に凸となる凸部を有する、請求項3又は8に記載の空気入りタイヤ。 - 前記第2外側周方向溝からタイヤ幅方向外側の接地端まで延在し、前記外側ショルダー陸部をタイヤ周方向に区画する第2サイプをさらに備え、
前記第2サイプは、トレッド面において複数の屈曲部を有する曲線形状であり、
前記第2サイプによりタイヤ周方向に区画される前記外側ショルダー陸部の各部分は、タイヤ回転方向の第1の方向に凸となる凸部を有する、請求項1~11のいずれか一項に記載の空気入りタイヤ。 - 前記第2ラグ溝のタイヤ周方向の間にあって、かつ、前記第2内側周方向溝からタイヤ幅方向内側に離間した位置を開始端とし、タイヤ幅方向内側に延びる第7ラグ溝が複数設けられた第7ラグ溝群をさらに備え、
前記第7ラグ溝の開始端と前記第2内側周方向溝とを接続する第3サイプがさらに設けられ、
前記第3サイプは、前記第7ラグ溝の開始端と前記第2内側周方向溝との間の屈曲部、前記第7ラグ溝の開始端から前記屈曲部までタイヤ回転方向の第1の方向とは反対の第2の方向かつタイヤ幅方向外側に延びる第1直線部、および、前記屈曲部から前記第2内側周方向溝側の端部までタイヤ回転方向の第1の方向かつタイヤ幅方向外側に延びる第2直線部と、からなり、
前記第3サイプによりタイヤ周方向に区画される前記内側ショルダー陸部の各部分は、タイヤ回転方向の第2の方向に凸となる凸部を有する、請求項1~12のいずれか一項に記載の空気入りタイヤ。 - 前記第3ラグ溝の開始端と前記第1外側周方向溝とを接続する第4サイプがさらに設けられている、請求項2に記載の空気入りタイヤ。
- 前記第1内側周方向溝と前記第2内側周方向溝との間には、前記第1ラグ溝と交差する第5サイプ75がさらに設けられている、請求項1~14のいずれか一項に記載の空気入りタイヤ。
- 前記空気入りタイヤは回転方向が予め定められたタイヤであって、
前記第1ラグ溝は、
前記第1内側周方向溝からタイヤ回転方向後側かつタイヤ幅方向内側に延びる第1傾斜部と、
前記第2内側周方向溝側からタイヤ回転方向後側かつタイヤ幅方向外側に延びる第2傾斜部と、
前記第1傾斜部と前記第2傾斜部とが交わる屈曲部とを有する、請求項1~15のいずれか一項に記載の空気入りタイヤ。 - 前記屈曲部から第1内側周方向溝側までのタイヤ幅方向の距離は、前記屈曲部から前記第2内側周方向溝までのタイヤ幅方向の距離よりも短い、請求項16に記載の空気入りタイヤ。
- 前記第2傾斜部及び前記屈曲部は、前記第1傾斜部よりも溝深さが小さい底上部である、請求項16又は17に記載の空気入りタイヤ。
- 前記第2傾斜部及び前記屈曲部には、前記第1ラグ溝の長さ方向に第6サイプが設けられている、請求項18に記載の空気入りタイヤ。
- 前記第2ラグ溝の前記第2内側周方向溝側の端部には、前記第2ラグ溝の他の部分よりも浅い底上部が設けられている、請求項1~19のいずれか一項に記載の空気入りタイヤ。
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JP2020037291A (ja) * | 2018-09-03 | 2020-03-12 | 住友ゴム工業株式会社 | タイヤ |
JP7135606B2 (ja) | 2018-09-03 | 2022-09-13 | 住友ゴム工業株式会社 | タイヤ |
JP2020125046A (ja) * | 2019-02-05 | 2020-08-20 | 住友ゴム工業株式会社 | タイヤ |
JP7225865B2 (ja) | 2019-02-05 | 2023-02-21 | 住友ゴム工業株式会社 | タイヤ |
JP2020196372A (ja) * | 2019-06-04 | 2020-12-10 | 横浜ゴム株式会社 | 空気入りタイヤ |
JP7183961B2 (ja) | 2019-06-04 | 2022-12-06 | 横浜ゴム株式会社 | 空気入りタイヤ |
WO2020246216A1 (ja) * | 2019-06-04 | 2020-12-10 | 横浜ゴム株式会社 | 空気入りタイヤ |
US11833860B2 (en) | 2019-06-04 | 2023-12-05 | The Yokohama Rubber Co., Ltd. | Pneumatic tire |
WO2022107767A1 (ja) * | 2020-11-20 | 2022-05-27 | 横浜ゴム株式会社 | タイヤ |
JP2022082365A (ja) * | 2020-11-20 | 2022-06-01 | 横浜ゴム株式会社 | タイヤ |
JP7031721B1 (ja) | 2020-11-20 | 2022-03-08 | 横浜ゴム株式会社 | タイヤ |
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CN106232390B (zh) | 2018-05-15 |
CN106232390A (zh) | 2016-12-14 |
DE112015001947T5 (de) | 2017-01-05 |
JP6365535B2 (ja) | 2018-08-01 |
US20170036488A1 (en) | 2017-02-09 |
JPWO2015163157A1 (ja) | 2017-04-13 |
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