WO2015053024A1 - 空気入りタイヤ - Google Patents
空気入りタイヤ Download PDFInfo
- Publication number
- WO2015053024A1 WO2015053024A1 PCT/JP2014/073650 JP2014073650W WO2015053024A1 WO 2015053024 A1 WO2015053024 A1 WO 2015053024A1 JP 2014073650 W JP2014073650 W JP 2014073650W WO 2015053024 A1 WO2015053024 A1 WO 2015053024A1
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- WIPO (PCT)
- Prior art keywords
- tire
- groove
- block
- grooves
- width direction
- 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
- B60C11/12—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
- B60C11/0306—Patterns comprising block rows or discontinuous ribs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/0306—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
- B60C11/11—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
- 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
- B60C2011/0374—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
- 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
- B60C5/00—Inflatable pneumatic tyres or inner tubes
Definitions
- the present invention relates to a pneumatic tire with improved braking performance on ice.
- anisotropy when anisotropy is given to the shape of a block formed by grooves, only the drag force against an external force in a specific direction is increased, and the specific performance of the tire performance tends to be improved.
- the braking performance on ice is improved when the resistance against external force in the tire circumferential direction is increased.
- the turning performance on ice is improved when the drag against the external force in the tire width direction is increased.
- the drainage performance tends to be improved.
- the first grounding side (stepping side) of the block defined by the groove is the V-shaped apex, so that water is removed from the groove. It is possible to efficiently drain and improve drainage performance.
- the present invention has been made in view of the above circumstances, and in particular, to provide a pneumatic tire in which braking performance on ice, turning performance on ice, and drainage performance are improved in a well-balanced manner.
- the pneumatic tire according to the present invention is a pneumatic tire provided with a circumferential main groove.
- a plurality of small blocks whose outer contours are composed of four line segments are arranged curved in the tire width direction to form an intermediate block.
- the middle block is arranged in a plurality of stages in the tire circumferential direction to form a large block.
- a plurality of the large blocks are formed in the tire circumferential direction adjacent to the circumferential main groove on each side in the tire width direction across the circumferential main groove.
- the shape of a large block composed of a plurality of small blocks having a predetermined shape is improved.
- braking performance on ice, turning performance on ice, and drainage performance are improved in a well-balanced manner.
- FIG. 1 is a plan view showing a tread portion of a pneumatic tire according to an embodiment of the present invention.
- FIG. 2 is an enlarged plan view showing a circled portion X of the tread portion shown in FIG.
- FIG. 3 is a plan view showing a tread portion of the pneumatic tire according to the embodiment of the present invention.
- FIG. 4 is a plan view showing a tread portion of a conventional pneumatic tire.
- the tire radial direction means a direction orthogonal to the rotational axis of the pneumatic tire
- the tire radial inner side is the side toward the rotational axis in the tire radial direction
- the tire radial outer side is in the tire radial direction.
- the tire circumferential direction refers to a circumferential direction with the rotation axis as a central axis.
- the tire width direction refers to a direction parallel to the rotation axis.
- the tire equatorial plane CL is a plane that is orthogonal to the rotational axis of the pneumatic tire and passes through the center of the tire width of the pneumatic tire.
- FIG. 1 is a plan view showing a tread portion of a pneumatic tire according to an embodiment of the present invention (a view of a grounded tire viewed from directly above).
- the example shown in FIG. 1 is an example of a pneumatic tire in which the rotation direction is not specified, and the tread pattern is point-symmetric on the left and right of the paper surface with respect to the tire equatorial plane CL (upper points) shown in FIG. ing.
- the example shown in FIG. 1 has shown the tread pattern between both grounding ends (not shown).
- the tread portion 10 of the pneumatic tire 1 is made of a rubber material (tread rubber), exposed at the outermost side in the tire radial direction of the pneumatic tire 1, and the surface thereof is the contour of the pneumatic tire 1.
- the surface of the tread portion 10 is formed as a tread surface 12 that is a surface that comes into contact with the road surface when a vehicle (not shown) on which the pneumatic tire 1 is mounted travels.
- the tread surface 12 communicates with each of a circumferential main groove 14 extending in the tire circumferential direction, a curved groove 16 that is inclined and curved with respect to the tire circumferential direction, and an adjacent curved groove 16.
- the first inclined groove 18, the lug groove 20 extending substantially in the tire width direction and curved, the fine lug groove 22 formed between the adjacent lug grooves 20, and the second fine lug groove 22 communicating with each other.
- Two inclined grooves 24 are respectively provided. Thereby, a plurality of small blocks SB are partitioned and the tread pattern shown in the figure is formed.
- the specific configuration of the grooves 14 to 24 is as follows.
- the circumferential main groove 14 is a main groove extending in the tire circumferential direction with the tire equatorial plane CL as the center line in the width direction.
- the groove width of the main groove in the circumferential direction (maximum dimension measured in a direction perpendicular to the extending direction of the groove; hereinafter, the groove width is the same for other grooves) is 4.0 mm or more
- the groove depth (groove The maximum dimension measured in the tire radial direction from the surface profile line in the case where there is not, the groove depth (the same applies to the other grooves) is 7.0 mm or more.
- the curved groove 16 is a groove that extends from the circumferential main groove 14 and curves while being inclined with respect to the tire circumferential direction.
- the curved form of the curved groove 16 is convex upward on the left side of the paper surface than the tire equator plane CL, and convex downward on the right side of the paper surface.
- the groove width of the curved groove 16 is 1.0 mm or more and 3.0 mm or less, and the groove depth is 3.0 mm or more and 9.0 mm or less.
- the first inclined groove 18 is a groove that communicates with each of the adjacent curved grooves 16 and extends substantially perpendicularly to the extending direction of the curved grooves 16 at the communicating portion to the curved grooves 16. Further, the first inclined grooves 18 extending on the respective sides in the direction perpendicular to the extending direction of the curved grooves 16 are formed to be offset in the extending direction of the curved grooves 16.
- the groove width of the inclined groove 18 is 1.0 mm or greater and 3.0 mm or less, and the groove depth is 3.0 mm or greater and 9.0 mm or less.
- the lug groove 20 extends from the curved groove 16 to the outer side in the tire width direction, and is a groove that curves and curves on the same side in the tire circumferential direction as the curved groove 16 on each side of the tire equatorial plane CL in the tire width direction. is there.
- the groove width of the lug groove 20 is not less than 3.0 mm and not more than 6.0 mm, and the groove depth is not less than 4.0 mm and not more than 12.0 mm.
- the fine lug groove 22 is formed between adjacent lug grooves 20, extends substantially parallel to the lug groove 20, and is narrower than the lug groove 20.
- the groove width of the lug groove 20 is 1.0 mm or more and 3.0 mm or less, and the groove depth is 1.0 mm or more and 9.0 mm or less.
- the second inclined groove 24 is a groove that communicates with each of the adjacent fine lug grooves 22 and extends substantially perpendicular to the extending direction of the fine lug grooves 22 at the communicating portion to these fine lug grooves 22. Further, the second inclined grooves 24 extending to the respective sides in the direction perpendicular to the extending direction of the fine lug grooves 22 are formed offset in the extending direction of the fine lug grooves 22.
- the groove width of the second inclined groove 24 is 1.0 mm or more and 3.0 mm or less, and the groove depth is 1.0 mm or more and 9.0 mm or less.
- the outer contour has four line segments. That is, one of the two adjacent ones of the curved grooves 16 (161 to 167) and the two adjacent ones of the circumferential main groove 14, the first inclined grooves 18 (181a to 189b), and the lug grooves 201 and 202.
- 24 small blocks SB are partitioned and formed by one side edge (line segment) of each of the four grooves formed of one of the two.
- the small block SB1 is formed by one side edge (line segment) of each of the four grooves of the grooves 162, 163, 185a, and 186a.
- the shape of the small block SB is not particularly limited as long as the outer contour is composed of four line segments. That is, the four line segments (in other words, the respective one side edges of the four grooves) may be straight lines or curved lines.
- a plurality of small blocks SB are arranged curved in the tire width direction. Accordingly, the small block SB is curved and disposed along the curved groove 16 by the circumferential main groove 14, any two adjacent ones of the curved grooves 161 to 167, and any one of the lug grooves 201 and 202. Middle blocks MB1 to MB6 are formed.
- the plurality of small blocks SB are arranged so as to be curved in the tire width direction, as shown in FIG. 2, for example, small blocks arranged in the tire width direction between two adjacent curved grooves 163 and 164.
- the blocks SB2, SB3, and SB4 are arranged in a curved manner along the edge on one side of each of the curved grooves 163 and 164.
- each of the edges constituting the small block SB and adjacent to the curved groove 16 is straight or curved like the other edges as described above.
- the edges along the same curved groove 16 are viewed continuously, as shown in FIG. 2, the curved shape is convex on either side of the tire circumferential direction.
- the middle block MB1 (MB4) is composed of five small blocks SB partitioned between the curved grooves 161, 162 (164, 165) along these grooves.
- the middle block MB2 (MB5) is composed of four small blocks SB partitioned between the curved grooves 162, 163 (165, 166) along these grooves.
- the middle block MB3 (MB6) is composed of three small blocks SB partitioned between the curved grooves 163 and 164 (166 and 167).
- a large block BB is formed by arranging a plurality of middle blocks MB in the tire circumferential direction.
- the large block BB1 includes three medium blocks MB1, MB2, and MB3 arranged in the tire circumferential direction
- the large block BB2 includes three medium blocks MB4, MB5, arranged in the tire circumferential direction. It consists of MB6.
- the large blocks BB (for example, BB1, BB2, BB3, BB4) are arranged in the circumferential direction on each side in the tire width direction across the circumferential main groove 14.
- a plurality of tires are formed adjacent to the main groove 14 in the circumferential direction of the tire, and in the example shown in FIG.
- a plurality of small blocks SB are arranged in the tire width direction to form medium blocks MB (MB1 to MB6), and further, the medium blocks MB are in the tire circumferential direction.
- the large blocks BB (BB1, BB2) are formed in three stages.
- the edge along the curved groove 16 of the small block SB that is a component of the medium block MB has a larger tire width direction component toward the inner side in the tire width direction.
- the tire circumferential direction component is larger in the smaller block SB on the outer side in the direction.
- the edge along the first inclined groove 18 (or the circumferential main groove 14 and the lug grooves 201 and 202) of the small block SB has a larger tire circumferential direction component toward the inner side in the tire width direction and the tire width direction.
- the outer side small block SB has a larger tire width direction component.
- the tire width direction component is sufficiently included in each small block SB over the entire region in the tire width direction.
- the middle block MB1 (comprised of the small blocks SB5 to SB9)
- the edges along the curved grooves 161 and 162 include a lot of tire width direction components.
- the edges along the first inclined grooves 181a and the lug grooves 201 contain a large amount of tire width direction components.
- the edges along the curved grooves 161 and 162 and the edges along the first inclined grooves 182a and 183a contain the tire width direction component in a well-balanced manner, and the whole is sufficient. Includes tire width direction component.
- the middle blocks MB2 to MB6 are the same as the middle block MB1 described above.
- the edge component in the tire width direction is sufficient over the entire region in the tire width direction.
- the small block SB included in can exert a resistance against an external force in the tire circumferential direction. Therefore, according to the pneumatic tire 1 of the present embodiment, excellent braking performance on ice can be realized.
- the extending direction of the edge along the curved groove 16 of the small block SB that is a component thereof is set to the inner side in the tire width direction.
- the small block SB gradually approaches the tire circumferential direction from the tire width direction toward the small block SB on the outer side in the tire width direction.
- the middle block MB1 when the slip angle is small (when the vehicle traveling direction is the extending direction of the first inclined groove 184a), the curved grooves of the small blocks SB5 and SB8 that are perpendicular to the vehicle traveling direction. Grip force is exhibited by the edges along 161 and 162, and slipping on ice can be suppressed.
- the vehicle traveling direction sequentially matches the extending direction of the first inclined groove 183a, the first inclined groove 182a, and the first inclined groove 181a.
- the edges along the curved grooves 161 and 162 of the small block (SB8, SB7), small block (SB7, SB9), and small block (SB9, SB6) exhibit grip power in order, and on ice Slip in can be suppressed.
- the description regarding the middle block MB1 regarding the suppression of slipping on ice is the same for the other middle blocks MB2 to MB6.
- the edge of the land portion perpendicular to the vehicle traveling direction is secured substantially continuously over the entire range of the slip angle assumed on the icy road surface, corresponding to the change of the slip angle.
- the extension of the edge along the first inclined groove 18 (or the circumferential main groove 14 and the lug grooves 201 and 202) of the small block SB that is a component thereof.
- the direction gradually approaches the tire width direction from the tire circumferential direction from the small block SB inside the tire width direction toward the small block SB outside the tire width direction.
- the centrifugal force is perpendicular to the extending direction of the first inclined groove 184a. Acts on direction.
- the resistance against the centrifugal force can be exhibited by the edge of the small block SB8 which is the outer edge of the turning circle of the first inclined groove 184a at the time of the circular turning with the slip angle.
- the vehicle traveling direction sequentially matches the extending direction of the first inclined groove 183a, the first inclined groove 182a, and the first inclined groove 181a.
- the centrifugal force acts in the direction perpendicular to the extending direction of the grooves 183a, 182a, and 181a
- the small blocks SB7 and SB9 which are the outer edges of the swirl circles of the grooves 183a, 182a, and 181a.
- the edge of SB6 can exert a resistance against centrifugal force.
- the description regarding the middle block MB1 regarding the resistance against centrifugal force is the same for the other middle blocks MB2 to MB6.
- the edge of the land portion extending in the vehicle traveling direction is ensured substantially continuously over the entire range of the slip angle assumed on the ice road surface, corresponding to the change of the slip angle.
- the resistance against centrifugal force can be exerted (Operation 2).
- each of the small blocks SB shown in FIG. 1 has anisotropy in both the tire circumferential direction and the tire width direction.
- the small block SB has anisotropy. It means having at least one edge that is not parallel to either the direction or the tire width direction.
- that the small block SB has anisotropy means that at least one of the grooves defining the small block SB is inclined with respect to the tire circumferential direction and the tire width direction. .
- the grooves forming the tread pattern are inclined with respect to the tire circumferential direction and the tire width direction, excellent drainage performance can be exhibited.
- the tread pattern shown in FIG. 1 for example, when the upper side of the paper surface is the stepping side and the lower side is the kicking side, the curved groove 16 is mainly formed on the left side of the paper surface from the tire equatorial plane CL.
- the lug grooves 20 each exhibit excellent drainage performance.
- the stepping side that contacts the ground first is the inner side in the tire width direction upstream of the drainage route, and the kicking side that touches the last is the outer side in the tire width direction that is downstream of the drainage route. This is because it is advantageous.
- water can be efficiently discharged
- the pneumatic tire according to the present embodiment is improved with respect to the shape of a large block composed of a plurality of small blocks having a predetermined shape.
- the pneumatic tire according to the present embodiment (basic form), in particular, braking performance on ice, turning performance on ice, and drainage performance can be improved in a well-balanced manner.
- the pneumatic tire which concerns on this Embodiment shown above has the same meridional cross-sectional shape as the conventional pneumatic tire.
- the meridional cross-sectional shape of the pneumatic tire refers to a cross-sectional shape of the pneumatic tire that appears on a plane perpendicular to the tire equatorial plane CL.
- the pneumatic tire according to the present embodiment has a bead portion, a sidewall portion, a shoulder portion, and a tread portion from the inner side in the tire radial direction toward the outer side in a tire meridian cross-sectional view.
- the pneumatic tire includes, for example, a carcass layer extending from a tread portion to bead portions on both sides and wound around a pair of bead cores in a tire meridional section, and a tire radial outside of the carcass layer.
- the belt layer and the belt reinforcing layer are sequentially formed.
- the pneumatic tire of the present embodiment includes normal manufacturing processes, that is, a tire material mixing process, a tire material processing process, a green tire molding process, a vulcanization process, and an inspection process after vulcanization. It is obtained through the process.
- a concave portion and a convex portion corresponding to the tread pattern shown in FIG. 1 are formed on the inner wall of the vulcanizing mold, and this mold is used for the addition. Sulfur is performed.
- the first inclined grooves 18 extending on the respective sides in the direction perpendicular to the extending direction of the curved grooves 16 are formed to be offset in the extending direction of the curved grooves 16.
- the small blocks SB are also offset from each other across the curved grooves 16 in the extending direction of the curved grooves 16. For this reason, when a load in a direction perpendicular to the extending direction of each curved groove 16 is locally applied in a state where a slip angle is given, the small blocks SB formed with the curved groove 16 interposed therebetween Is in contact with each other, one small block SB contacts two small blocks SB sandwiching the curved groove 16.
- the small block SB1 when a slip angle is given and, for example, a load in a direction perpendicular to the extending direction of the curved grooves 163 and 162 near the small block SB1 is applied, the small block SB1 The two small blocks SB7 and SB9 or the two small blocks SB2 and SB3 are brought into contact with each other. For this reason, one small block SB can be supported by two small blocks SB, and the rigidity of the large block BB1 as a whole can be increased, and thereby, particularly excellent braking performance and excellent turning performance on ice. Can be improved.
- the angle formed by the circumferential main groove 14 and the lug groove 201 (202) is preferably 40 ° or more and 160 ° or less.
- the extending direction of the lug groove 201 (202) is the one end P1 and the other end P2 of the plurality of small blocks SB partitioned by the lug groove 201 (202) in the tire circumferential direction.
- the large blocks BB1 and BB2 can reliably support each other when an external force in the tire circumferential direction is applied.
- the rigidity of the entire large block BB formed in the tire circumferential direction can be increased, and in particular, the steering stability performance on ice can be improved.
- the curved groove 16 that communicates with the circumferential main groove 14 and curves in the tire width direction to form the small block SB is 0.04 / mm or more and 0.3 / mm. It is preferable to be arranged with the following density (additional form 1).
- the arrangement density of the curved grooves 16 refers to the longest curved grooves 161 and 164 that define the large blocks BB (BB1 and BB2) shown in FIG. This means the number of the curved grooves 16 arranged per unit length.
- the arrangement density of the curved grooves 16 is the density of the curved grooves 16 that partition and form one large block BB, and the density of the curved grooves 16 that partition and form the other large blocks BB is the longest standard. Since the curved groove is different, it shall be measured separately.
- the edge length along the curved grooves 16 of the small blocks SB is changed to the first inclined grooves 18 (or the circumferential mains) of the small blocks SB. It is possible to suppress an excessively small edge length along the groove 14 and the lug grooves 201 and 202). As a result, the small block SB is prevented from falling in the extending direction of the curved groove 16 due to centrifugal force during turning, and sufficient resistance against centrifugal force during turning is ensured to improve turning performance on ice. can do.
- the edge length along the first inclined groove 18 formed in the small block SB can be sufficiently secured.
- the small block SB is prevented from falling in the tire circumferential direction during braking, and the large blocks BB1 and BB2 are turned in the tire width direction outer portion.
- the small block SB is prevented from falling in the extending direction of the curved groove 16. As a result, braking performance on ice and turning performance on ice are improved.
- the area of the small block SB in FIG. 1 is preferably 15 mm 2 or more and 250 mm 2 or less (additional form 2).
- the rigidity of the small block SB can be increased and the steering stability performance can be improved.
- the target small block SB in the present embodiment is not only the small block SBa constituting the large blocks BB1 and BB2 shown in FIG. 1, but also at least the first between the adjacent lug grooves 20 shown in FIG.
- the small block SBb defined by the two inclined grooves 24 is also included.
- the circumferential position of the large block BB refers to an intermediate position between one end and the other end in the tire circumferential direction.
- the circumferential position means an intermediate position in the tire circumferential direction at one end P2 and the other end P3 in the tire circumferential direction.
- the large block BB By causing the tire circumferential direction position of the large block BB to alternately exist with the circumferential main groove 14 interposed therebetween, for example, the large block BB (BB1, BB2, BB3, BB4, etc.) in the curved groove 16 shown in FIG. 2) are formed in a state that is offset by a half cycle in the tire circumferential direction with the circumferential main groove 14 interposed therebetween.
- inclined grooves having a relatively large groove width that easily affect drainage performance are formed at a smaller pitch in the tire circumferential direction on both sides of the circumferential groove 14 in the tire width direction. As a result, the drainage performance can be more stably exhibited, and more efficient drainage is possible.
- FIG. 3 is a plan view showing the tread portion of the pneumatic tire according to the embodiment of the present invention (a view of the grounded tire viewed from directly above). 3 that are the same as those shown in FIG. 1 indicate the same components as those shown in FIG. In addition, the example shown in FIG. 3 also shows the tread pattern between both grounding ends (not shown) similarly to the example shown in FIG.
- the tread portion 11 of the pneumatic tire 2 is made of a rubber material (tread rubber), exposed at the outermost side in the tire radial direction of the pneumatic tire 2, and the surface thereof is the contour of the pneumatic tire 2.
- the surface of the tread portion 11 is formed as a tread surface 13 that is a surface that comes into contact with the road surface when a vehicle (not shown) on which the pneumatic tire 1 is mounted travels.
- the lug groove 20 having the largest groove width among the grooves other than the circumferential main groove 14.
- 20 'exhibits an excellent drainage function. This is because, assuming the flow of water, the stepping side that contacts the ground first is the inner side in the tire width direction upstream of the drainage route, and the kicking side that touches the last is the downstream side of the drainage route. This is because it is advantageous. Thereby, in the example shown in FIG. 3, water can be discharged
- each large block BB is deformed from the kicking side toward the stepping side, so that the large block on the stepping side supports the large block on the kicking side between the large blocks adjacent in the tire circumferential direction. It becomes. Specifically, the large block BB3 on the stepping side shown in FIG. 3 supports the large block BB4 on the kicking side.
- the surface including the contact region is smaller than the surface including the contact region. It is advantageous in terms of efficiently distributing stress that the relatively large land portion supports the relatively small land portion including the contact area.
- the large block BB3 having a relatively large surface including the contact area illustrated in FIG. The direction of rotation is specified to support As a result, the braking performance on ice is further improved.
- sipe means a groove having a groove width of 0.4 mm or more and less than 1.0 mm.
- a large block BB composed of a plurality of small blocks SB can have more edges.
- the edge by formation of the sipe 26 contains many components in the tire circumferential direction, the resistance against the external force in the tire width direction is further increased, and the turning performance on ice can be greatly enhanced.
- the edge due to the formation of the sipe 26 includes a lot of components in the tire width direction, the resistance against the external force in the tire circumferential direction is further increased, and the braking performance on ice can be greatly improved.
- the tire size is 195 / 65R15, and it has one of the tread patterns shown in FIG. 1 or FIG. 3, and the conditions (1) to (9) shown in Table 1, that is, (1) the large block is the circumferential main groove Whether or not a plurality of tire circumferential directions are formed adjacent to the circumferential main groove on each side in the tire width direction across the tire (large block tire circumferential direction formation mode) (2) Arrangement density of curved grooves (3) Area of small blocks (4) Position in the tire circumferential direction between large blocks across the circumferential main groove (5) Designation of rotation direction (6) At least one in each small block Whether or not a book sipe is formed (whether or not sipe is present) Thus, pneumatic tires of Example 1 to Example 6 were produced.
- the example illustrated in FIG. 1 is an example in which the tire rotation direction is not specified
- the example illustrated in FIG. 3 is an example in which the tire rotation direction is specified.
- FIG. 4 a conventional pneumatic tire having a tread pattern shown in FIG. 4 with a tire size of 195 / 65R15 was produced.
- the example shown in FIG. 4 has shown the tread pattern between both grounding ends (not shown).
- test tires of Examples 1 to 6 and the conventional example manufactured as described above was assembled to a 15 ⁇ 6J rim at an air pressure of 220 kPa and mounted on a sedan type vehicle having a displacement of 1500 CC, and braking performance on ice, The turning performance and drainage performance were evaluated. These results are also shown in Table 1.
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Abstract
Description
以下に、本発明に係る空気入りタイヤについて、その基本形態を説明する。以下の説明において、タイヤ径方向とは、空気入りタイヤの回転軸と直交する方向をいい、タイヤ径方向内側とはタイヤ径方向において回転軸に向かう側、タイヤ径方向外側とはタイヤ径方向において回転軸から離れる側をいう。また、タイヤ周方向とは、上記回転軸を中心軸とする周り方向をいう。さらに、タイヤ幅方向とは、上記回転軸と平行な方向をいう。加えて、タイヤ赤道面CLとは、空気入りタイヤの回転軸に直交するとともに、空気入りタイヤのタイヤ幅の中心を通る平面である。
本実施の形態に係る空気入りタイヤでは、図2に示すように、小ブロックSBがタイヤ幅方向に複数配置されて中ブロックMB(MB1からMB6)が形成され、さらに中ブロックMBがタイヤ周方向に3段配置されて大ブロックBB(BB1、BB2)が形成されている。
図2に示す例では、上述したとおり、各湾曲溝16の延在方向に垂直な方向の各側に延在する第1傾斜溝18同士は、湾曲溝16の延在方向においてオフセットして形成されている。このため、各湾曲溝16を挟んだ各側においては、小ブロックSB同士も、湾曲溝16の延在方向においてオフセットして形成されている。このため、スリップ角が付与された状態で、局所的に、各湾曲溝16の延在方向に垂直な方向の荷重が加わった場合には、湾曲溝16を挟んで形成された小ブロックSB同士が接触する際には、1つの小ブロックSBは湾曲溝16を挟んだ2つの小ブロックSBと接触する。
次に、本発明に係る空気入りタイヤの上記基本形態に対して、任意選択的に実施可能な、付加的形態1から5を説明する。
基本形態においては、図1において、周方向主溝14と連通してタイヤ幅方向に湾曲して小ブロックSBを区画形成する湾曲溝16が、0.04本/mm以上0.3本/mm以下の密度で配設されていること(付加的形態1)が好ましい。
基本形態及び基本形態に付加的形態1を加えた形態においては、図1において、小ブロックSBの面積が15mm2以上250mm2以下であること(付加的形態2)が好ましい。
基本形態及び基本形態に付加的形態1、2の少なくともいずれかを加えた形態においては、図1において、大ブロックBBのタイヤ周方向位置が、周方向主溝14を挟んで、交互に存在すること(付加的形態3)が好ましい。
基本形態及び基本形態に付加的形態1から3の少なくともいずれかを加えた形態においては、回転方向が指定されていること(付加的形態4)が好ましい。
基本形態及び基本形態に付加的形態1から4の少なくともいずれかを加えた形態においては、図1、3のそれぞれにおいて、小ブロックSBの少なくともいずれかに、少なくとも1本のサイプ26、26´が形成されていること(付加的形態5)が好ましい。ここで、サイプとは、溝幅が0.4mm以上1.0mm未満の溝をいう。
(1)大ブロックが、周方向主溝を挟んだタイヤ幅方向各側で、周方向主溝に隣接してタイヤ周方向に複数形成されているか否か(大ブロックのタイヤ周方向形成態様)
(2)湾曲溝の配設密度
(3)小ブロックの面積
(4)周方向主溝を挟んだ大ブロック同士のタイヤ周方向存在位置
(5)回転方向の指定
(6)小ブロックに少なくとも1本のサイプが形成されているか否か(サイプの有無)
に従い、実施例1から実施例6の空気入りタイヤを作製した。なお、図1に示す例は、タイヤの回転方向が指定されていない例であり、図3に示す例は、タイヤの回転方向が指定されている例である。
氷盤路面において、時速40kmで走行した状態からの制動距離を測定して従来例を基準(100)とした指数評価を行った。この評価は、数値が大きいほど、氷上での制動性能が優れていることを示す。
1周6mの氷盤路面を旋回した際の周回タイムを測定して従来例を基準(100)とした指数評価を行った。この評価は、数値が大きいほど、氷上での旋回性能が優れていることを示す。
水深5mmのウェット路面を停止から加速して行く過程において、タイヤのグリップがなくなりタイヤが空転したときの速度を計測して従来例を基準(100)とした指数評価を行った。この評価は、数値が大きいほど、排水性能が優れていることを示す。
10、11 トレッド部
12、13 トレッド表面
14 周方向主溝
16、16´ 湾曲溝
18、18´ 第1傾斜溝
20、20´ ラグ溝
22、22´ 細ラグ溝
24、24´ 第傾斜溝
26、26´ サイプ
BB 大ブロック
MB 中ブロック
SB 小ブロック
CL タイヤ赤道面
X 丸囲み部分
Claims (6)
- 周方向主溝が設けられた空気入りタイヤにおいて、
外輪郭が4つの線分からなる複数の小ブロックがタイヤ幅方向に湾曲して配置されて、中ブロックが形成され、
前記中ブロックがタイヤ周方向に複数段配置されて、大ブロックが形成され、
前記大ブロックは、前記周方向主溝を挟んだタイヤ幅方向各側で、前記周方向主溝に隣接してタイヤ周方向に複数形成されている、空気入りタイヤ。 - 前記周方向主溝と連通してタイヤ幅方向に湾曲して前記小ブロックを区画形成する湾曲溝が、0.04本/mm以上0.3本/mm以下の密度で配設されている、請求項1に記載の空気入りタイヤ。
- 前記小ブロックの面積が15mm2以上250mm2以下である、請求項1又は2に記載の空気入りタイヤ。
- 前記大ブロックのタイヤ周方向位置が、前記周方向主溝を挟んで、交互に存在する、請求項1から3のいずれか1項に記載の空気入りタイヤ。
- 回転方向が指定されている、請求項1から4のいずれか1項に記載の空気入りタイヤ。
- 前記小ブロックの少なくともいずれかに、少なくとも1本のサイプが形成されている、請求項1から5のいずれか1項に記載の空気入りタイヤ。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP14851755.0A EP3081399B1 (en) | 2013-10-09 | 2014-09-08 | Pneumatic tire |
RU2017114625A RU2657606C1 (ru) | 2013-10-09 | 2014-09-08 | Пневматическая шина |
US15/517,155 US20170305200A1 (en) | 2013-10-09 | 2014-09-08 | Pneumatic Tire |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2013212182A JP6000218B2 (ja) | 2013-10-09 | 2013-10-09 | 空気入りタイヤ |
JP2013-212182 | 2013-10-09 |
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WO2015053024A1 true WO2015053024A1 (ja) | 2015-04-16 |
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PCT/JP2014/073650 WO2015053024A1 (ja) | 2013-10-09 | 2014-09-08 | 空気入りタイヤ |
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US (1) | US20170305200A1 (ja) |
EP (1) | EP3081399B1 (ja) |
JP (1) | JP6000218B2 (ja) |
RU (1) | RU2657606C1 (ja) |
WO (1) | WO2015053024A1 (ja) |
Cited By (1)
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CN112166043A (zh) * | 2018-05-31 | 2021-01-01 | 米其林集团总公司 | 包括通风割口的用于重型土木工程类车辆的轮胎胎面 |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JP6472022B2 (ja) * | 2014-12-25 | 2019-02-20 | Toyo Tire株式会社 | 空気入りタイヤ及びその成形型 |
JP6472023B2 (ja) | 2014-12-25 | 2019-02-20 | Toyo Tire株式会社 | 空気入りタイヤ及びその成形型 |
JP6712907B2 (ja) | 2016-06-03 | 2020-06-24 | 株式会社ブリヂストン | 空気入りタイヤ |
USD920894S1 (en) * | 2019-11-11 | 2021-06-01 | The Goodyear Tire & Rubber Company | Tire |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6418707A (en) * | 1987-07-15 | 1989-01-23 | Sumitomo Rubber Ind | Pneumatic tire |
WO2010032606A1 (ja) | 2008-09-16 | 2010-03-25 | 株式会社ブリヂストン | 空気入りタイヤ |
JP2010285040A (ja) * | 2009-06-10 | 2010-12-24 | Bridgestone Corp | 空気入りタイヤ |
WO2012018081A1 (ja) * | 2010-08-05 | 2012-02-09 | 株式会社ブリヂストン | タイヤ |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE8810493U1 (ja) * | 1988-08-19 | 1988-11-10 | Continental Aktiengesellschaft, 3000 Hannover, De | |
ES2062269T3 (es) * | 1989-12-29 | 1994-12-16 | Continental Ag | Perfil de banda de rodadura para neumaticos. |
DE4108745A1 (de) * | 1991-03-18 | 1992-09-24 | Sp Reifenwerke Gmbh | Luftreifen |
DE19635147A1 (de) * | 1996-08-30 | 1998-03-05 | Continental Ag | Fahrzeugluftreifen |
DE19722571C2 (de) * | 1997-05-29 | 2002-02-14 | Continental Ag | Drehsinngebundene profilierte Lauffläche für Fahrzeugluftreifen |
JP3376342B2 (ja) * | 2000-03-13 | 2003-02-10 | 東洋ゴム工業株式会社 | 空気入りラジアルタイヤ |
RU2466877C2 (ru) * | 2010-12-29 | 2012-11-20 | Общество С Ограниченной Ответственностью Научно-Производственная Фирма "Трэкол" | Шина полноприводного вездехода |
-
2013
- 2013-10-09 JP JP2013212182A patent/JP6000218B2/ja active Active
-
2014
- 2014-09-08 US US15/517,155 patent/US20170305200A1/en not_active Abandoned
- 2014-09-08 RU RU2017114625A patent/RU2657606C1/ru not_active IP Right Cessation
- 2014-09-08 EP EP14851755.0A patent/EP3081399B1/en not_active Not-in-force
- 2014-09-08 WO PCT/JP2014/073650 patent/WO2015053024A1/ja active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6418707A (en) * | 1987-07-15 | 1989-01-23 | Sumitomo Rubber Ind | Pneumatic tire |
WO2010032606A1 (ja) | 2008-09-16 | 2010-03-25 | 株式会社ブリヂストン | 空気入りタイヤ |
JP2010285040A (ja) * | 2009-06-10 | 2010-12-24 | Bridgestone Corp | 空気入りタイヤ |
WO2012018081A1 (ja) * | 2010-08-05 | 2012-02-09 | 株式会社ブリヂストン | タイヤ |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112166043A (zh) * | 2018-05-31 | 2021-01-01 | 米其林集团总公司 | 包括通风割口的用于重型土木工程类车辆的轮胎胎面 |
CN112166043B (zh) * | 2018-05-31 | 2022-08-16 | 米其林集团总公司 | 包括通风割口的用于重型土木工程类车辆的轮胎胎面 |
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JP2015074360A (ja) | 2015-04-20 |
EP3081399B1 (en) | 2019-05-08 |
US20170305200A1 (en) | 2017-10-26 |
JP6000218B2 (ja) | 2016-09-28 |
EP3081399A4 (en) | 2017-08-30 |
EP3081399A1 (en) | 2016-10-19 |
RU2657606C1 (ru) | 2018-06-14 |
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