WO2013077427A1 - タイヤ - Google Patents
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- Publication number
- WO2013077427A1 WO2013077427A1 PCT/JP2012/080370 JP2012080370W WO2013077427A1 WO 2013077427 A1 WO2013077427 A1 WO 2013077427A1 JP 2012080370 W JP2012080370 W JP 2012080370W WO 2013077427 A1 WO2013077427 A1 WO 2013077427A1
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- WIPO (PCT)
- Prior art keywords
- tread
- lateral groove
- tire
- angle
- land
- Prior art date
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Classifications
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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
- B60C11/0304—Asymmetric patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/11—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
- 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
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/01—Shape of the shoulders between tread and sidewall, e.g. rounded, stepped or cantilevered
- B60C2011/013—Shape of the shoulders between tread and sidewall, e.g. rounded, stepped or cantilevered provided with a recessed 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
- B60C2200/00—Tyres specially adapted for particular applications
- B60C2200/06—Tyres specially adapted for particular applications for heavy duty vehicles
- B60C2200/065—Tyres specially adapted for particular applications for heavy duty vehicles for construction vehicles
Definitions
- the present invention relates to a tire having a tread portion that comes into contact with a road surface.
- the tread portion of the tire Since the rubber material having viscoelasticity follows hysteresis behavior, the tread portion of the tire generates heat by repeating deformation and contraction due to rolling. When the rubber material constituting the tread portion increases, hysteresis loss due to bending deformation or shear deformation during tire rolling increases. Therefore, the temperature of a tire having a thick tread portion is likely to increase.
- large tires used in large vehicles used in mines and construction sites not only have a large amount of rubber material used, but also under heavy load conditions, poor road surfaces, and severe traction conditions. Since the tire is repeatedly deformed and contracted, it has a feature that it easily generates heat. If the tire becomes hot during running, it may cause separation (separation) between the rubber material forming the tread portion and the belt layer, leading to a faster tire replacement cycle.
- the conventional tire has the following problems. That is, by forming a lateral groove portion (sub-groove) that intersects the tire circumferential direction and increasing the groove area, heat dissipation can be promoted, but an increase in the groove area leads to a decrease in rigidity and wear resistance of the tread portion. . Thus, since the heat dissipation of the tire and the rigidity of the tire are in a trade-off relationship, there is a limit to securing the heat dissipation by increasing the groove area.
- an object of the present invention is to provide a tire that can reliably improve heat dissipation without impairing the rigidity and wear resistance of the tread portion.
- the tire (pneumatic tire 1) has a tread portion (tread portion 13) that contacts the road surface.
- a lateral groove portion (lateral groove 40A) extending in a direction intersecting the tire circumferential direction and a land portion (land portion block 100) partitioned by the lateral groove portion are formed.
- the land portion includes a tread surface (step surface 100S) that contacts the road surface, a side surface (side surface 101) formed on the outer side in the tread width direction of the land portion, and the lateral groove formed on one of the land portions in the tire circumferential direction.
- corner portion formed by the tread surface, the side surface, and the lateral groove surface, and the tread surface, the side surface, and the lateral groove.
- the gist is to have a tapered surface (tapered surface 100R) that intersects the surface.
- FIG. 1 is a perspective view of a pneumatic tire according to the present embodiment.
- FIG. 2 is a cross-sectional view of the pneumatic tire according to the present embodiment in the tread width direction and the tire radial direction.
- FIG. 3 is an enlarged perspective view in which the tread portion of the pneumatic tire is enlarged.
- FIG. 4 is an enlarged perspective view in which a land block of a pneumatic tire is enlarged.
- FIG. 5 is a plan view of the tread portion viewed from the direction of arrow A in FIG.
- FIG. 6 is a plan view of the tread portion viewed from the direction of arrow A in FIG.
- FIG. 7 is a plan view of a pneumatic tire shown as a modification of the present embodiment as seen from a direction perpendicular to the tread portion.
- FIG. 1 is a perspective view of a pneumatic tire according to the present embodiment.
- FIG. 2 is a cross-sectional view of the pneumatic tire according to the present embodiment in the tread width direction and the tire
- FIG. 8 is a plan view of a pneumatic tire shown as a modification of the present embodiment as seen from a direction perpendicular to the tread portion.
- FIG. 9 is an enlarged perspective view of an enlarged land block of a pneumatic tire according to another embodiment of the present invention.
- FIG. 10 is an enlarged perspective view of an enlarged land block of a pneumatic tire according to another embodiment of the present invention.
- FIG. 11A is a perspective view showing an outline of a simulation model in the comparative evaluation 1 of the present invention.
- FIG. 11B is an enlarged perspective view showing an outline of a simulation model in the comparative evaluation 1 of the present invention.
- FIG.11 (c) is a graph which shows the simulation model result in the comparative evaluation 1 of this invention.
- FIG. 12A is an enlarged view of a tread portion of a pneumatic tire according to a conventional example viewed from the tread surface in Comparative Evaluation 2 of the present invention.
- FIG. 12B is an enlarged view of the tread portion of the pneumatic tire according to the example viewed from the tread surface in the comparative evaluation 2 of the present invention.
- FIG. 13 is a perspective view showing an outline of a simulation model in the comparative evaluation 3 of the present invention.
- FIG. 14 is a graph showing the results of simulation in comparative evaluation 3 of the present invention.
- Embodiments of a pneumatic tire 1 according to the present invention will be described with reference to the drawings. Specifically, (1) the configuration of the pneumatic tire, (2) the configuration of the land portion, (3) the action / effect, and (4) the modification will be described.
- FIG. 1 is a perspective view of a pneumatic tire 1 according to this embodiment.
- FIG. 2 is a cross-sectional view of the pneumatic tire 1 along the tread width direction tw and the tire radial direction td.
- the pneumatic tire 1 according to the present embodiment may be filled with an inert gas such as nitrogen gas instead of air.
- the pneumatic tire 1 includes a bead portion 11 that contacts the rim, a sidewall portion 12 that forms a side surface of the tire, a tread portion 13 that contacts a road surface, a sidewall portion 12 and a tread portion. 13 and a buttress portion 14 positioned between the two.
- the buttress portion 14 is located on the extension of the sidewall portion 12 in the tire radial direction, and is a portion where the side surfaces of the tread portion 13 are continuous.
- the buttress part 14 extends from the tread end part 13e outside the tread width direction tw of the tread part 13 toward the inside in the tire radial direction td.
- the position inside the tire radial direction td of the buttress portion 14 is equivalent to the innermost position in the tire radial direction td of the opening position in the tread end portion 13e of a lateral groove (lateral groove 40A) described later.
- the buttress portion 14 is a portion that does not come into contact with the ground during normal running.
- circumferential grooves 20A and 20B are formed along the tire circumferential direction tc. Further, circumferential land portions 30A, 30B, and 30C defined by the circumferential grooves 20A and 20B are formed.
- a lateral groove 40A extending in a direction intersecting the tire circumferential direction tc is formed.
- a lateral groove 40B extending in a direction intersecting the tire circumferential direction tc is formed in the circumferential land portion 30B.
- a lateral groove 40C extending in a direction intersecting the tire circumferential direction tc is formed in the circumferential land portion 30C.
- the circumferential land portions 30A, 30B, and 30C are divided by the lateral grooves 40A, 40B, and 40C, thereby forming the land blocks 100, 110, and 120.
- the lateral grooves 40A, 40B, 40C communicate with the circumferential grooves 20A, 20B.
- the lateral groove 40A is open at the tread end portion 13e.
- the pneumatic tire 1 has a carcass layer 51 that is a skeleton of the pneumatic tire 1.
- An inner liner 52 which is a highly airtight rubber layer corresponding to a tube, is provided inside the carcass layer 51 in the tire radial direction td. Both ends of the carcass layer 51 are supported by a pair of beads 53.
- a belt layer 54 is disposed outside the carcass layer 51 in the tire radial direction td.
- the belt layer 54 includes a first belt layer 54a and a second belt layer 54b obtained by rubberizing a steel cord.
- the steel cords constituting the first belt layer 54a and the second belt layer 54b are arranged with a predetermined angle with respect to the tire equator line CL.
- the tread portion 13 is disposed on the outer side in the tire radial direction td of the belt layer 54 (the first belt layer 54a and the second belt layer 54b).
- Width of both end portions (tread end portion 13e) of the tread portion 13 of the pneumatic tire 1 is expressed as TW.
- both ends of the tread portion 13 indicate both ends in the tread width direction tw of the ground contact range when the tire is in contact with the road surface.
- the state where the tire is in contact with the road surface indicates, for example, a state where the tire is mounted on a normal rim and a normal internal pressure and a normal load are applied.
- a regular rim refers to a standard rim in an applicable size defined in Yearbook ⁇ 2008 edition of JATMA (Japan Automobile Tire Association).
- the normal internal pressure is the air pressure corresponding to the maximum load capacity of JATMA Year Book 2008 version
- the normal load is the load corresponding to the maximum load capacity when the single wheel of JATMA Year Book2008 version is applied. .
- the standards governing these are determined by industry standards that are valid in the region where the tire is produced or used. For example, in the United States, “The Steel and Rim Association Inc. Year Book”, and in Europe, “The European Tire and Rim Technical Standards Manual”.
- the pneumatic tire 1 is assumed to be a radial tire having, for example, a flatness ratio of 80% or less, a rim diameter of 57 ′′ or more, a load load capacity of 60 mton or more, and a load coefficient (k-factor) of 1.7 or more.
- the pneumatic tire 1 is not limited to this.
- FIG. 3 is an enlarged perspective view in which the tread portion 13 of the pneumatic tire 1 is enlarged.
- FIG. 4 is an enlarged perspective view in which the land block 100 is enlarged.
- 5 to 6 are plan views seen from the direction of arrow A in FIG.
- the land block 100 is formed by dividing the circumferential land portion 30A by a lateral groove 40A.
- the land portion block 100 includes a tread surface 100S that contacts the road surface, a side surface 101 that is formed outside the land portion block 100 in the tread width direction tw, a side surface 102 that is located inside the tread width direction tw of the land portion block 100, A lateral groove surface 103 forming a groove wall of a lateral groove 40A formed on one side of the tire block in the tire circumferential direction tc and a groove wall of a lateral groove 40A formed on the other side of the land block 100 in the tire circumferential direction tc are formed. And a lateral groove surface 104.
- the land portion block 100 has a tapered surface 100 ⁇ / b> R that intersects the tread surface 100 ⁇ / b> S, the side surface 101, and the lateral groove surface 103 at a corner portion 100 ⁇ / b> A formed by the tread surface 100 ⁇ / b> S, the side surface 101, and the lateral groove surface 103.
- the corner portion 100A constitutes the tread end portion 13e of the tread portion 13 described above.
- the side surface 101 is formed on the buttress portion 14 side of the land block 100.
- the side surface 101 extends along the tire circumferential direction tc.
- the side surface 101 continues to the lateral groove surfaces 103 and 104 of the land block 100 that forms the groove wall of the lateral groove 40A.
- the side surface 102 is formed to face the side surface 101 in the tread width direction tw.
- the side surface 102 forms a groove wall of the circumferential groove 20 ⁇ / b> A adjacent to the land block 100 inside the tread width direction tw.
- the lateral groove surface 103 extends in the tread width direction tw.
- the lateral groove surface 103 is located on one side of the tire circumferential direction tc of the land block 100.
- the lateral groove surface 104 extends in the tread width direction tw.
- the lateral groove surface 104 is located on the other side in the tire circumferential direction tc of the land block 100.
- the tapered surface 100R extends toward the tire circumferential direction tc at a corner portion 100A formed by the tread surface 100S and the side surface 101.
- the taper surface 100R is inclined inward in the tire radial direction td as it goes to one side in the tire circumferential direction tc in the cross section of the land block 100 in the tire circumferential direction tc and the tire radial direction td.
- the taper surface 100 ⁇ / b> R is also inclined toward the inner side in the tire radial direction td toward the outer side in the tread width direction tw in the cross section of the land block 100 in the tread width direction tw and the tire radial direction td.
- the taper surface 100R is formed to chamfer the apex where the tread surface 100S, the side surface 101, and the lateral groove surface 103 intersect. In other words, the taper surface 100R is formed between the tread surface 100S, the side surface 101, and the lateral groove surface 103 so that each surface has at least one side.
- the tapered surface 100R has one side on the side surface 101 of the side surface 101 and the side surface 102 in the tread width direction Tw of the land block 100, and does not have one side on the side surface 102. That is, in the land block 100, one of the side surface 101 and the side surface 102 (side surface 102) facing each other in the tread width direction Tw does not intersect the tapered surface 100R.
- the taper surface 100R has one side in the lateral groove surface 103 and does not have one side in the lateral groove surface 103 out of the lateral groove surface 103 and the lateral groove surface 104 of the land block 100 in the tire circumferential direction Tc. That is, in the land block 100, one of the lateral groove surfaces 103 and the lateral groove surfaces 104 facing each other in the tire circumferential direction Tc (the lateral groove surface 104) does not intersect the tapered surface 100R.
- the air flowing along the tapered surface 100R during the rotation of the pneumatic tire 1 collides with the lateral groove surface 104 of another land block 100 adjacent in the tire circumferential direction Tc. It becomes easy. That is, the air flowing along the tapered surface 100 ⁇ / b> R is easily taken into the lateral groove 40 ⁇ / b> A adjacent to the land block 100 in the tire circumferential direction Tc.
- the shape of the tapered surface 100R is a planar shape.
- the shape of the tapered surface 100R extends linearly in a cross section in the tire circumferential direction tc and the tire radial direction td, or in a cross section in the tread width direction tw and the tire radial direction td.
- the angle ⁇ 1 formed by the plane Sv and the tread surface 100S is in a range of 0 ° ⁇ 1 ⁇ 45 °.
- the angle ⁇ 2 formed by the plane Sv and the side surface 101 is in the range of 0 ° ⁇ 2 ⁇ 45 °.
- one of the angle ⁇ 1 and the angle ⁇ 2 may be in a range of 0 ° ⁇ 1 (or ⁇ 2) ⁇ 45 °. More preferably, the angle ⁇ 1 (or angle ⁇ 2) is in the range of 10 ° ⁇ 1 (or ⁇ 2) ⁇ 30 °.
- the tapered surface 100R since the tapered surface 100R has a planar shape, the tapered surface 100R and the plane Sv are the same surface.
- the angle ⁇ ⁇ b> 1 extends parallel to the taper surface 100 ⁇ / b> R (plane Sv) and is perpendicular to the end portion 100 ⁇ / b> R ⁇ b> 1 formed by the taper surface 100 ⁇ / b> R and the tread surface 100 ⁇ / b> S, and the tread surface
- it can be said to be an angle formed with a straight line extending in parallel with 100S and orthogonal to the end portion 100R1.
- the angle ⁇ 1 can also be said to be an inclination angle of the tapered surface 100R (plane Sv) with respect to the tread surface 100S.
- the end portion 100R1 is on a straight line connecting the vertex P1 and the vertex P2 in the plane Sv.
- the angle ⁇ 2 extends in parallel to the tapered surface 100R (plane Sv), extends in parallel to the side surface 101, a straight line orthogonal to the end portion 100R2 formed by the tapered surface 100R and the side surface 101, and In other words, it is an angle formed by a straight line orthogonal to the end portion 100R2. Furthermore, the angle ⁇ 2 can also be said to be an inclination angle of the tapered surface 100R (plane Sv) with respect to the side surface 101.
- the end portion 100R2 is on a straight line connecting the vertex P2 and the vertex P3 on the plane Sv.
- the tapered surface 100R is preferably formed so that the interval L2 between the apex P1 and the apex P3 in the tire radial direction td is longer than the interval L1 between the apex P1 and the apex P2 in the tread width direction tw. This is due to the following reason. That is, by making the interval L2 longer than the interval L1, the taper surface 100R is more likely to remain even when the wear of the land block 100 proceeds from the tread surface 100S. That is, it becomes possible to improve the sustainability of the effect by the tapered surface 100R.
- the interval L2 is more preferably 50 mm or more.
- the land portion block 100 includes the tread surface 100 ⁇ / b> S, the side surface 101, and the lateral groove surface 103 at the corner portion 100 ⁇ / b> A formed by the tread surface 100 ⁇ / b> S and the side surface 101 located outside the tread width direction tw. And has a tapered surface 100R intersecting with
- heat dissipation can be improved, without using methods, such as increasing a groove area, like the prior art. That is, heat dissipation can be improved without impairing the rigidity and wear resistance of the tread portion.
- the angle ⁇ 1 formed by the plane Sv passing through the apexes P1 to P3 of the tapered surface 100R and the tread surface 100S is in a range of 0 ° ⁇ 1 ⁇ 45 °.
- the angle ⁇ 2 formed by the plane Sv and the side surface 101 is in the range of 0 ° ⁇ 2 ⁇ 45 °.
- the angle ⁇ 1 (or ⁇ 2) is 45 ° or more, the air flowing through the surface of the tapered surface 100R is easily separated, and the flow rate of the air flowing through the lateral groove 40A is difficult to increase. That is, by setting the angle ⁇ 1 (or ⁇ 2) within the above-described range, the temperature of the tread portion 13 can be further reduced.
- a case where the angle ⁇ 1 (or ⁇ 2) is 0 ° or less is a case where the tapered surface 100R is not formed, and thus the description thereof is omitted.
- the lateral groove 40A communicates with the circumferential groove 20A. Therefore, the air taken into the transverse groove 40A or the air discharged from the transverse groove 40A circulates in the circumferential groove 20A in the tire circumferential direction tc, so that the temperature of the tread portion 13 can be further reduced.
- the shape of the tapered surface 100R is a planar shape. According to such a pneumatic tire 1, the air flowing along the tapered surface 100 ⁇ / b> R is less likely to be peeled off compared to the case where the shape of the tapered surface 100 ⁇ / b> R is convex in the outward direction of the land block 100. can do. On the other hand, as compared with the case where the shape of the tapered surface 100R is formed in a concave shape in the inward direction of the land block 100, a decrease in the volume of the land block 100 can be suppressed. And the rigidity of the land block 100 can be secured.
- the tapered surface 100R is formed on the buttress portion 14 side of the land block 100. That is, the taper surface 100R is formed at the outermost side in the tread width direction tw in the tread portion 13.
- the air flowing along the surface of the buttress portion 14 of the pneumatic tire 1 can be taken into the lateral groove 40 ⁇ / b> A. That is, even if the temperature of the tread portion 13 increases due to the rotation of the tire, air having a temperature lower than that of the tread portion 13 can be taken into the tread portion 13, so that the temperature of the tread portion 13 can be further reduced.
- FIGS. 7 to 8 are plan views of the pneumatic tire 2 shown as modified examples of the present embodiment as viewed from the direction perpendicular to the tread portion, and when the pneumatic tire 2 rotates in the rotational direction tr1. It is a schematic diagram explaining the air flow AR which arises.
- the lateral groove 41A is inclined with respect to the tread width direction line along the tread width direction tw.
- the center line ln of the transverse groove 41A along the extending direction of the transverse groove 41A formed in the circumferential land portion 30A is inclined by the angle ⁇ z with respect to the tread width direction line TL along the tread width direction tw. .
- the land block 200 divided by the circumferential groove 20A and the lateral groove 41A includes a tread surface 200S, a side surface 201 on the buttress portion 14 side, a side surface 202 facing the side surface 201, and one of the land block 200 in the tire circumferential direction tc.
- the angle ⁇ a formed by the side surface 201 that intersects the tapered surface 100R and the lateral groove surface 203 that intersects the tapered surface 200R is preferably an obtuse angle.
- the angle ⁇ b formed by the side surface 201 and the lateral groove surface 204 becomes an acute angle.
- the tapered surface 200R preferably does not intersect the side surface 201 and the lateral groove surface 204 where the angle ⁇ a formed by each other surface is an acute angle, but intersects the side surface 201 and the lateral groove surface 203 where the angle ⁇ b formed by each other surface becomes an obtuse angle. .
- the air flow (relative wind) AR due to the rotation is a lateral groove of the land block 200 located behind the rotational direction tr1. It collides with the surface 204 and is taken into the lateral groove 41A. At this time, since the horizontal groove 41A is inclined, the air flow AR is easily taken into the horizontal groove 41A. Thereby, the heat transfer coefficient inside the lateral groove 41A is improved, and the effect of reducing the temperature of the land block 200 can be enhanced.
- FIGS. 9A to 9F are enlarged perspective views of land blocks in a pneumatic tire according to another embodiment.
- the taper surface 100Ra (plane Sv) has a distance between the vertex P1 and the vertex P3 rather than the interval L1 in the tread width direction tw between the vertex P1 and the vertex P2. You may form so that the space
- the tapered surface 100Rb (plane Sv) has a distance between the apex P1 and the apex P3 rather than the interval L1 in the tread width direction tw between the apex P1 and the apex P2. You may form so that the space
- the tapered surface 100R may be formed to be bent. Further, the number of times the tapered surface 100R is bent is not limited to one, and may be formed to be bent a plurality of times.
- the angle ⁇ 1 formed by the plane Sv passing through the vertices P1 to P3 and the tread surface 100S is in the range of 0 ° ⁇ 1 ⁇ 45 °. It is.
- the angle ⁇ 2 formed by the plane Sv and the side surface 101 is in the range of 0 ° ⁇ 2 ⁇ 45 °.
- FIGS. 9C to 9F show both surfaces of the tapered surface 100R of the land block 100 and a virtual plane Sv for defining the angles ⁇ 1 to ⁇ 2.
- the angle ⁇ 1 is defined based on the tapered surface 100R and the tread surface 100S
- the angle ⁇ 2 is defined based on the tapered surface 100R and the side surface 101.
- the angle ⁇ 1 is defined based on the plane Sv and the tread surface 100S
- the angle ⁇ 2 is defined based on the plane Sv and the side surface 101.
- the angle ⁇ 1 is an imaginary plane.
- the angle ⁇ ⁇ b> 2 is defined based on the virtual plane Sv and the side surface 101.
- or 100Rl may be formed in the curved surface shape.
- the tapered surface may be formed in a curved surface shape that is concave toward the inner direction (inside) of the block. Furthermore, it may be formed in a curved surface shape that is convex toward the outside direction (inside) of the block.
- the angle ⁇ 1 formed by the plane Sv passing through the vertices P1 to P3 and the tread surface 100S is in the range of 0 ° ⁇ 1 ⁇ 45 °. It is.
- the angle ⁇ 2 formed by the plane Sv and the side surface 101 is in the range of 0 ° ⁇ 2 ⁇ 45 °.
- FIGS. 10A to 10F similarly to FIGS. 9C to 9F described above, the tapered surface 100R of the land block 100 and the virtual plane Sv that defines the angles ⁇ 1 to ⁇ 2 are used. It should be noted that.
- the pneumatic tire according to the present embodiment can be applied to a general-purpose tire, although a remarkable effect can be obtained when applied to a so-called super-large tire.
- Heat transfer of pneumatic tires by forming a tapered surface that cuts from the side surface to the inside of the land portion on the side surface (buttress portion) that intersects the width direction of the tread portion, and communicates with the lateral groove portion.
- the temperature rise of the tread surface can be reduced.
- the tread pattern of the pneumatic tire 1 shown in FIG. 1 is illustrated. However, it is not limited to this tread pattern.
- the type which has the rib-like land part in which the horizontal groove is not formed in the tire equator line vicinity of the pneumatic tire 1 may be sufficient.
- the lateral groove portions (lateral grooves 40, lateral grooves 41) are all formed at the same angle with respect to the tire circumferential direction.
- the angle of the lateral groove portion with respect to the tire circumferential direction is not necessarily the same.
- the circumferential land portions 30A, 30B, and 30C may be formed at different angles.
- transverse grooves having different angles may also be formed in one circumferential land portion 30A.
- the circumferential grooves 20A and 20B are formed in the tread portion.
- the circumferential grooves 20A and 20B are not necessarily formed. That is, in the tread portion, only the lateral groove portions (lateral grooves 40, lateral grooves 41) may be formed.
- the land block located on one outer side in the tread width direction tw is described as an example, but the outer side of both in the tread width direction tw is described.
- the land block located at can also have a tapered surface. Further, it is possible that each of the plurality of land blocks has a tapered surface having a different shape.
- a step extending in a direction perpendicular to the flow is provided in a wide space where the uniform flow flows, and a slope portion is provided at a part of the corner of the step.
- the surface in the negative y-axis when viewed from the center of the space is the wind inlet, the surface in the positive direction is the outlet, and there is a uniform flow in the positive y-axis in the space.
- the surface in the negative z-axis direction is the floor surface, and a boundary condition of zero flow velocity is given on the wall surface of the floor surface.
- the other wall surfaces are virtual wall surfaces that do not actually exist, and give a so-called slip condition in which a flow velocity component other than the uniform flow direction (y-axis direction) is zero.
- the step is shaped so that the floor surface descends in the negative direction of the z-axis toward the leeward side of the uniform flow. By providing a slope at the corner of the step, the wind flowing along the floor surface is drawn in the negative z-axis direction by the slope. At this time, the correlation between the ability of the slope to draw in the wind and the slope entrance angle ⁇ was determined by changing the average wind speed at the slope exit while changing the slope entrance angle ⁇ .
- the slope outlet cross section has a constant z-axis length (constant cross-sectional area) and the inlet angle is a variable as shown in FIG. (Thus, the y-axis length of the slope is a dependent variable of the entrance angle)
- the simulation results are shown in FIG.
- the horizontal axis shows the slope inlet angle
- the vertical axis shows the air volume passing through the slope outlet as a ratio (%) of the uniform flow velocity.
- the uniform flow velocity was calculated at three levels of 8, 20, and 40 km / h, respectively.
- the air volume taken in by the slope at the uniform flow level was almost zero when the inlet angle was 45 °.
- the tire sizes of the pneumatic tires were all 59 / 80R63.
- a temperature prediction simulation was performed with an internal pressure of 600 kPa and a load of 101.6 tons.
- a land portion block having no tapered surface was used.
- the land block has a flat tapered surface. Note that in the pneumatic tire according to Example 1, since the tapered surface has a planar shape, the tapered surface and the plane Sv are the same. Details of the angle ⁇ 1 and the angle ⁇ 2 are as shown in Table 1.
- the temperature prediction analysis in the conventional example and the example was performed by simulation, and the average value of the upper temperature of the outermost belt in the tread was used as the evaluation index. Then, using the measured value of the tire of the conventional example as a reference (100), an evaluation index for relative evaluation was calculated for the tire of Example 1.
- the evaluation results in Table 1 indicate that the smaller the evaluation index, the better the heat dissipation performance.
- the heat dissipation performance of the tire of Example 1 was superior to that of the conventional tire. That is, the angle ⁇ 1 formed by the plane Sv passing through the apexes P1 to P3 of the tapered surface and the tread surface 100S is in the range of 0 ° ⁇ 1 ⁇ 45 °, or the angle ⁇ 2 formed by the plane Sv and the side surface 101 is 0 ° ⁇ It has been proved that the pneumatic tire in the range of ⁇ 2 ⁇ 45 ° is excellent in heat dissipation performance.
- FIG. 13 is a perspective view showing an outline of a simulation model (pneumatic tire) used in the simulation.
- an imaginary line L100A extending in the extending direction of the corner portion 100A was defined along the corner portion 100A located outside the land portion block 100 in the tread width direction tw.
- the inclination angle ⁇ x formed by the virtual line L100A and the tapered surface 100R was set to be different from each other. Specifically, in Example 11, the inclination angle ⁇ x was 20 °, in Example 12, the inclination angle ⁇ x was 35 °, and in the comparative example, the inclination angle ⁇ x was 55 °.
- the interval L1 and the interval L2 were set to be equal. Specifically, the interval L1 and the interval L2 were set to 60 mm.
- a mainstream flowing in the tire circumferential direction tc was given to each of the above-described Examples 11 to 12 and the comparative example. And the ratio of the wind speed (horizontal groove wind speed) which flows into the horizontal groove 40A with respect to the wind speed (mainstream wind speed) of the said mainstream was calculated.
- the main wind speed was 8 km / h (2.222 m / s).
- the average value of the transverse groove wind speed was calculated by dividing the total airflow flowing through the transverse groove 40A by the cross-sectional area of the transverse groove 40A.
- FIG. 14 the result of Example 11 is shown as data D1
- the result of Example 12 is shown as data D2
- the result of the comparative example is shown as data D3.
- FIG. 14 it shows that it is excellent in the cooling effect, so that the value of the ratio (%) of the wind speed shown on a vertical axis
- Examples 1 and 2 were superior in cooling effect than the comparative example. As a result, it has been found that if the inclination angle ⁇ x is too large, the cooling effect decreases. Moreover, the direction of Example 1 showed the tendency which is excellent in the cooling effect rather than Example 2. FIG. As a result, it has been found that the cooling effect is further enhanced when the inclination angle ⁇ x is 20 ° or less.
- the tire according to the present invention is useful because it can provide a tire capable of reliably improving heat dissipation without impairing the rigidity and wear resistance of the tread portion.
Abstract
Description
特に、鉱山や建築現場などで使用される大型の車両に用いられる大型タイヤは、使用されているゴム材料の量が多いだけでなく、重負荷状態、劣悪路面、及び過酷なトラクション条件の下で使用され、タイヤが変形と収縮とを繰り返すため、発熱しやすいという特徴がある。走行中にタイヤが高温になると、トレッド部を形成するゴム材料とベルト層との剥離(セパレーション)などの原因にもなり、タイヤの交換サイクルを早めることに繋がる。
図1は、本実施形態に係る空気入りタイヤ1の斜視図である。図2は、空気入りタイヤ1のトレッド幅方向tw及びタイヤ径方向tdに沿った断面図である。本実施形態に係る空気入りタイヤ1には、空気ではなく、窒素ガスなどの不活性ガスが充填されてもよい。
図3は、空気入りタイヤ1のトレッド部13を拡大した拡大斜視図である。図4は、陸部ブロック100を拡大した拡大斜視図である。図5乃至6は、図3の矢印A方向からみた平面図である。
本実施形態において、テーパ面100Rの形状は、平面形状である。すなわち、テーパ面100Rの形状は、タイヤ周方向tc及びタイヤ径方向tdの断面、又は、トレッド幅方向tw及びタイヤ径方向tdの断面において、線形的に延びる。
空気入りタイヤ1では、陸部ブロック100が、踏面100Sとトレッド幅方向tw外側に位置する側面101とによって形成される角部100Aにおいて、踏面100Sと側面101と横溝面103とに交わるテーパ面100Rを有する。
図7乃至8は、本実施形態の変形例として示す空気入りタイヤ2をトレッド部に垂直な方向からみた平面図であり、空気入りタイヤ2が回転方向tr1に回転するときに生じる空気の流れARを説明する模式図である。変形例1として示す空気入りタイヤ2では、横溝41Aが、トレッド幅方向twに沿ったトレッド幅方向線に対して傾斜している。具体的に、周方向陸部30Aに形成される横溝41Aの延びる方向に沿った横溝41Aの中心線lnがトレッド幅方向twに沿ったトレッド幅方向線TLに対して角度θzだけ傾斜している。
上述したように、本発明の実施形態を通じて本発明の内容を開示したが、この開示の一部をなす論述及び図面は、本発明を限定するものであると理解すべきではない。この開示から当業者には様々な代替実施の形態、実施例が明らかとなる。
次に、テーパ面と踏面が成す角度θ1及びテーパ面と溝側面が成す角度θ2の臨界値0°<θ1<45°、0°<θ2<45°を求める際に実施した数値流体解析シミュレーションについて説明する。
次に、本発明の効果を更に明確にするために、以下の比較例及び実施例に係る空気入りタイヤを用いて行った比較評価について説明する。なお、本発明はこれらの例によって何ら限定されるものではない。
まず、比較評価にあたり、図12(a)に示す従来例に係る空気入りタイヤと、図12(b)に示す実施例1に係る空気入りタイヤとを準備した。表1には、各空気入りタイヤの構成が示されている。なお、各空気入りタイヤは、テーパ面の構成を除き、他の構成は同一である。
次に、実施例11乃至12及び比較例を用いて実施した数値流体解析シミュレーションについて説明する。図13は、シミュレーションにおいて用いたシミュレーションモデル(空気入りタイヤ)の概要を示す斜視図である。
Claims (6)
- 路面に当接するトレッド部を有するタイヤであって、
前記トレッド部には、タイヤ周方向に交差する方向に延びる横溝部と、前記横溝部によって区画された陸部とが形成され、
前記陸部は、路面に当接する踏面と、前記陸部のトレッド幅方向外側に形成される側面と、前記陸部のタイヤ周方向の一方に形成される前記横溝部の溝壁を形成する横溝面とを有するとともに、前記踏面と前記側面と前記横溝面とによって形成される角部において、前記踏面と前記側面と前記横溝面とに交わるテーパ面を有する
ことを特徴とするタイヤ。 - ビード部と、前記ビード部に連なるサイドウォール部と、前記トレッド部の幅方向外側のトレッド端部からタイヤ径方向の内側に向けて延び前記サイドウォール部に連なるバットレス部とを有しており、
前記テーパ面は、前記陸部のバットレス部側に形成される
ことを特徴とする請求項1に記載のタイヤ。 - タイヤ周方向に沿って延びる周方向溝部を更に備え、
前記横溝部は、前記周方向溝部に連通する
ことを特徴とする請求項1又は2に記載のタイヤ。 - 前記テーパ面と前記踏面と前記側面とが交わる頂点と、前記テーパ面と前記踏面と前記横溝面とが交わる頂点と、前記テーパ面と前記側面と前記横溝面が交わる頂点とを通る平面を仮定した場合、
前記平面と前記踏面との成す角度θ1は、0°<θ1<45°の範囲、
又は、前記平面と前記側面との成す角度θ2は、0°<θ2<45°の範囲である
ことを特徴とする請求項1乃至3のいずれか一項に記載のタイヤ。 - 前記横溝部は、トレッド幅方向に沿ったトレッド幅方向線に対して傾斜しており、
前記テーパ面に交わる側面と、前記テーパ面に交わる横溝面との成す角度は、鈍角である
ことを特徴とする請求項1乃至4のいずれか一項に記載のタイヤ。 - 前記テーパ面の形状は、平面形状である
ことを特徴とする請求項1乃至5のいずれか一項に記載のタイヤ。
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2856238A CA2856238C (en) | 2011-11-22 | 2012-11-22 | Tire |
US14/359,885 US9162532B2 (en) | 2011-11-22 | 2012-11-22 | Tire |
CN201280057266.9A CN103958221B (zh) | 2011-11-22 | 2012-11-22 | 轮胎 |
ES12850897.5T ES2663418T3 (es) | 2011-11-22 | 2012-11-22 | Neumático |
EP12850897.5A EP2783882B1 (en) | 2011-11-22 | 2012-11-22 | Tire |
JP2013545971A JP5547856B2 (ja) | 2011-11-22 | 2012-11-22 | タイヤ |
AU2012341419A AU2012341419B2 (en) | 2011-11-22 | 2012-11-22 | Tire |
RU2014125272/11A RU2561656C1 (ru) | 2011-11-22 | 2012-11-22 | Шина |
BR112014012179A BR112014012179A2 (pt) | 2011-11-22 | 2012-11-22 | pneu |
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JP2011255595 | 2011-11-22 | ||
JP2011-255595 | 2011-11-22 |
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WO2013077427A1 true WO2013077427A1 (ja) | 2013-05-30 |
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PCT/JP2012/080370 WO2013077427A1 (ja) | 2011-11-22 | 2012-11-22 | タイヤ |
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US (1) | US9162532B2 (ja) |
EP (1) | EP2783882B1 (ja) |
JP (1) | JP5547856B2 (ja) |
CN (1) | CN103958221B (ja) |
AU (1) | AU2012341419B2 (ja) |
BR (1) | BR112014012179A2 (ja) |
CA (1) | CA2856238C (ja) |
CL (1) | CL2014001341A1 (ja) |
ES (1) | ES2663418T3 (ja) |
RU (1) | RU2561656C1 (ja) |
WO (1) | WO2013077427A1 (ja) |
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WO2015060127A1 (ja) * | 2013-10-22 | 2015-04-30 | 住友ゴム工業株式会社 | 空気入りタイヤ |
JP2015186935A (ja) * | 2014-03-26 | 2015-10-29 | 住友ゴム工業株式会社 | 空気入りタイヤ |
JP2017081286A (ja) * | 2015-10-26 | 2017-05-18 | 株式会社ブリヂストン | 重荷重用タイヤ |
WO2019116611A1 (ja) * | 2017-12-12 | 2019-06-20 | 株式会社ブリヂストン | 重荷重用タイヤ |
JP2020050225A (ja) * | 2018-09-28 | 2020-04-02 | 住友ゴム工業株式会社 | タイヤ |
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JP6534795B2 (ja) * | 2014-08-08 | 2019-06-26 | 株式会社ブリヂストン | 非空気入りタイヤ |
JP6405284B2 (ja) * | 2015-04-17 | 2018-10-17 | 住友ゴム工業株式会社 | 空気入りタイヤ |
JP6954867B2 (ja) * | 2018-06-19 | 2021-10-27 | 株式会社ブリヂストン | 重荷重用タイヤ |
JP7225871B2 (ja) * | 2019-02-06 | 2023-02-21 | 住友ゴム工業株式会社 | タイヤ |
CN114987659A (zh) * | 2022-07-13 | 2022-09-02 | 东莞市卓蓝自动化设备有限公司 | 一种新能源电池转运agv小车 |
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- 2012-11-22 ES ES12850897.5T patent/ES2663418T3/es active Active
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WO2015060127A1 (ja) * | 2013-10-22 | 2015-04-30 | 住友ゴム工業株式会社 | 空気入りタイヤ |
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US10889150B2 (en) | 2013-10-22 | 2021-01-12 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
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JP2017081286A (ja) * | 2015-10-26 | 2017-05-18 | 株式会社ブリヂストン | 重荷重用タイヤ |
WO2019116611A1 (ja) * | 2017-12-12 | 2019-06-20 | 株式会社ブリヂストン | 重荷重用タイヤ |
JP2020050225A (ja) * | 2018-09-28 | 2020-04-02 | 住友ゴム工業株式会社 | タイヤ |
JP7087890B2 (ja) | 2018-09-28 | 2022-06-21 | 住友ゴム工業株式会社 | タイヤ |
Also Published As
Publication number | Publication date |
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EP2783882A4 (en) | 2015-07-01 |
AU2012341419A1 (en) | 2014-07-17 |
EP2783882B1 (en) | 2018-01-03 |
CN103958221A (zh) | 2014-07-30 |
EP2783882A1 (en) | 2014-10-01 |
US9162532B2 (en) | 2015-10-20 |
CN103958221B (zh) | 2015-05-27 |
CA2856238C (en) | 2018-05-08 |
RU2561656C1 (ru) | 2015-08-27 |
AU2012341419B2 (en) | 2015-08-13 |
CL2014001341A1 (es) | 2015-01-16 |
US20140318676A1 (en) | 2014-10-30 |
CA2856238A1 (en) | 2013-05-30 |
ES2663418T3 (es) | 2018-04-12 |
JP5547856B2 (ja) | 2014-07-16 |
JPWO2013077427A1 (ja) | 2015-04-27 |
BR112014012179A2 (pt) | 2017-05-30 |
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