WO2011145721A1 - 重荷重用タイヤ - Google Patents
重荷重用タイヤ Download PDFInfo
- Publication number
- WO2011145721A1 WO2011145721A1 PCT/JP2011/061649 JP2011061649W WO2011145721A1 WO 2011145721 A1 WO2011145721 A1 WO 2011145721A1 JP 2011061649 W JP2011061649 W JP 2011061649W WO 2011145721 A1 WO2011145721 A1 WO 2011145721A1
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- WIPO (PCT)
- Prior art keywords
- tread
- tire
- groove
- width direction
- 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
- B60C11/04—Tread patterns in which the raised area of the pattern consists only of continuous circumferential ribs, e.g. zig-zag
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/01—Shape of the shoulders between tread and sidewall, e.g. rounded, stepped or cantilevered
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- 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
- B60C11/12—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
- B60C11/13—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
- B60C3/00—Tyres characterised by the transverse section
- B60C3/04—Tyres characterised by the transverse section characterised by the relative dimensions of the section, e.g. low profile
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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
- B60C2011/1254—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern with closed sipe, i.e. not extending to a 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
- B60C2200/00—Tyres specially adapted for particular applications
- B60C2200/06—Tyres specially adapted for particular applications for heavy duty vehicles
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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 includes a bead portion, a sidewall portion connected to the bead portion, a tread portion that abuts against a road surface, and the sidewall extending from the tread end portion on the outer side in the width direction of the tread portion toward the inner side in the tire radial direction.
- the present invention relates to a heavy duty tire having a buttress portion connected to the portion.
- 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.
- heavy duty tires used in large vehicles used in mines and construction sites are not only large in the 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 is easy to generate 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.
- the first feature is that a bead portion (bead portion 11), a sidewall portion (sidewall portion 12) connected to the bead portion, a tread portion (tread portion 13) that contacts the road surface, and a width direction of the tread portion
- a heavy-duty tire having a buttress portion (buttress portion 14) extending from an outer tread end portion (tread end portion 13e) inward in the tire radial direction and continuing to the sidewall portion, ,
- a land portion having at least one end portion opened at the tread end and intersecting in the tire circumferential direction and having a side surface defined by the lateral groove portion and intersecting in the width direction of the tread portion.
- the length of the land portion in the tread width direction is formed so as to become shorter from one to the other in the tire circumferential direction.
- the length of the land portion in the tread width direction is a length from a groove end reference line extending along the tire circumferential direction to the tread end, and the groove end reference line extends the land portion in the tire circumferential direction.
- the gist is defined by the inner ends in the tread width direction of the lateral groove portions adjacent to each other.
- the lateral groove portion is inclined with respect to a tread width direction line along the tread width direction.
- a circumferential groove along the tire circumferential direction is formed, and the lateral groove communicates with the circumferential groove.
- a side surface of the land portion that intersects the width direction of the tread portion is a curve.
- a side surface of the land portion that intersects the width direction of the tread portion is a curve having an inflection point.
- the said horizontal groove part is inclined with respect to the tread width direction line along a tread width direction,
- the length of the tread width direction in one edge part of the tire circumferential direction of the said land part is the following.
- the angle between the side surface of the land portion and the wall surface of the lateral groove portion is longer than the length in the tread width direction at the end portion of the land portion where the angle is obtuse.
- the heavy duty tire according to the first feature is a tire for construction vehicles.
- 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 of the pneumatic tire is enlarged.
- 4 is a plan view seen from the direction of arrow A in FIG.
- FIG. 5 is a plan view of the pneumatic tire shown as the first modification of the present embodiment when viewed from the direction perpendicular to the tread portion, and the air flow AR generated when the pneumatic tire rotates in the rotation direction R will be described. It is a schematic diagram.
- 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 of the pneumatic tire is enlarged.
- 4 is
- FIG. 6 is a plan view of a pneumatic tire shown as Modification 2 of the present embodiment as viewed from a direction perpendicular to the tread portion, and illustrates an air flow AR generated when the pneumatic tire rotates in the rotation direction R.
- FIG. 7 is a plan view of a pneumatic tire shown as a third modification of the present embodiment as viewed from a direction perpendicular to the tread portion, and an air flow AR generated when the pneumatic tire rotates in the rotation direction R will be described.
- FIG. 8 is an enlarged perspective view in which a tread of a pneumatic tire shown as Modification 4 of the present embodiment is enlarged.
- FIG. 9 is a plan view seen from the direction of arrow B in FIG. FIG.
- FIG. 10 is an enlarged perspective view in which a tread of a pneumatic tire shown as Modification 5 of the present embodiment is enlarged.
- FIG. 11 is an enlarged perspective view in which a tread of a pneumatic tire shown as Modification 6 of the present embodiment is enlarged.
- FIG. 12 is a view showing a pneumatic tire shown as a modified example 7 of the present embodiment.
- FIG. 13 is a view showing a pneumatic tire shown as a modified example 8 of the present embodiment.
- FIG. 14 is a diagram illustrating a land block shown as a ninth modification of the present embodiment.
- Embodiments of a pneumatic tire 1 according to the present invention will be described with reference to the drawings. Specifically, (1) the internal configuration of the pneumatic tire, (2) the description of the land portion, (3) the action / effect, (4) the modification, and (5) other embodiments 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 tr.
- 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 the road surface, a sidewall portion 12 and a tread portion. 13 and a buttress portion 14 positioned between the two.
- the pneumatic tire 1 is a heavy load tire.
- the pneumatic tire 1 is a construction vehicle tire.
- the buttress portion 14 is located on the extension of the sidewall portion 12 in the tire radial direction, and is a portion constituting the side surface of the tread portion 13.
- the buttress portion 14 is a portion from the tread end portion 13e to the groove bottom portion of a lateral groove (lug groove) that opens to the tread end portion 13e.
- the buttress portion 14 extends from the tread end portion 13e on the outer side in the tread width direction of the tread portion 13 toward the inner side in the tire radial direction tr.
- 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.
- the circumferential land portion 30A At least one end portion is opened at the tread end, and a lateral groove 40A intersecting in the tire circumferential direction is formed.
- a lateral groove 40B that intersects in the tire circumferential direction is formed.
- the circumferential land portion 30C at least one end portion is opened at the tread end, and a lateral groove 40C intersecting in the tire circumferential direction is formed.
- 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, and 40C are communicated with the circumferential grooves 20A and 20B.
- the pneumatic tire 1 has a carcass layer 51 that is a skeleton of the pneumatic tire 1.
- An inner liner 52 that is a highly airtight rubber layer corresponding to a tube is provided inside the carcass layer 51 in the tire radial direction. 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.
- 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 of the belt layer 54 (the first belt layer 54a and the second belt layer 54b).
- the side surface 101 on the buttress portion 14 side of the land portion block 100 formed by dividing the circumferential land portion 30 ⁇ / b> A by the lateral groove 40 ⁇ / b> A is a land portion block with respect to a plane parallel to the tire circumferential direction and the tire radial direction. Inclined toward the inside of 100.
- the maximum width of the pneumatic tire 1 is represented as SW, and the width of the tread portion 13 of the pneumatic tire 1 is represented as TW.
- the pneumatic tire 1 may be filled with an inert gas such as nitrogen gas instead of air.
- the pneumatic tire 1 is, for example, a radial tire having 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. .
- FIG. 3 is an enlarged perspective view in which the tread part 13 of the pneumatic tire 1 is enlarged.
- 4 is a plan view seen from the direction of arrow A in FIG.
- the land portion block 100 formed by dividing the circumferential land portion 30A by the lateral groove 40A includes a side surface 101 on the buttress portion 14 side, a side surface 102 provided on the opposite side of the side surface 101, and one of the land portion blocks 100 in the tire circumferential direction.
- One end 100A in the tire circumferential direction of the land block 100 is located on the rear side in the rotational direction (arrow R shown in FIG. 3) that rotates in the vehicle forward direction when the pneumatic tire 1 is mounted on the vehicle. .
- the other end 100 ⁇ / b> B in the tire circumferential direction of the land block 100 is located on the front side in the rotation direction R.
- the length Lb1 in the tread width direction at the end portion 100A is shorter than the length La1 in the tread width direction at the end portion 100A of the land block 100.
- the length La1 in the tread width direction and the length Lb1 in the tread width direction are the length from the groove end reference line extending in the tire circumferential direction to the tread end.
- the groove end reference line is defined by a tread width direction inner end of the lateral groove 40A adjacent to the land block 100 in the tire circumferential direction.
- the groove end reference line is the inner end of the circumferential groove 20A in the tread width direction. You can think of it.
- the difference between the length Lb1 in the tread width direction at the end portion 100B of the land block 100 and the length La1 in the tread width direction at the end portion 100A of the land block 100 is represented by a length Lw1.
- the length Lw1 is preferably 5 mm or more.
- the side surface 101 extends obliquely toward the inside of the land portion block 100 with respect to a plane along the tire circumferential direction, and is continuous with the side surface 104 of the land portion block 100 constituting the inner wall of the lateral groove 40A.
- the end portion 100B on the rear side in the tire circumferential direction of the land block 100 is located on the inner side in the tread width direction from the sidewall portion 12 by a length Lw. That is, the rear side in the tire circumferential direction of the land block 100 of the buttress part 14 is located on the inner side in the tread width direction from the sidewall part 12 by the length Lw. For this reason, a step is formed between the buttress portion 14 and the side surface 101.
- a groove bottom 40Ab which is a groove bottom of the lateral groove portion 40A, extends from the end portion 100B on the rear side in the rotational direction in the tire circumferential direction toward the end portion 100A.
- the groove bottom 40Ab is located between the buttress portion 14 and the side surface 101.
- FIG. 5 is a plan view of the pneumatic tire 2 shown as a modification of the present embodiment as seen from the direction perpendicular to the tread portion, and the air flow AR generated when the pneumatic tire 2 rotates in the rotation direction R will be described. It is a schematic diagram to do.
- the center line ln of the lateral groove 41A along the extending direction of the lateral groove 41A formed in the circumferential land portions 30A, 30B, 30C is a tread width direction line TL along the tread width direction. Is inclined by an angle ⁇ .
- the land portion block 200 defined by the circumferential groove 20A and the lateral groove 41A includes a side surface 201 on the buttress portion 14 side, a side surface 202 provided on the opposite side of the side surface 201, and one end of the land portion block 200 in the tire circumferential direction. 200A side surface 203 and the other end portion 200B side surface 204 in the tire circumferential direction.
- One end portion 200A in the tire circumferential direction of the land block 200 is located on the rear side in the rotational direction (arrow R shown in FIG. 5) that rotates in the forward direction when the pneumatic tire 2 is mounted on the vehicle.
- the other end 200 ⁇ / b> B in the tire circumferential direction of the land block 200 is located on the front side in the rotation direction R.
- the length La2 in the tread width direction at one end portion 200A in the tire circumferential direction of the land block 200 is equal to the side surface 201 of the land block 200 and the lateral groove portion 41A.
- the angle formed with the wall surface is longer than the length Lb2 in the tread width direction at the end portion 200B where the obtuse angle ⁇ is obtained.
- the air flow (relative wind) AR caused by the rotation collides with the side surface 203 and is taken into the lateral groove 41A. Since the lateral groove 41A is inclined, the air flow AR is easily taken into the lateral 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.
- Modification 2 6A and 6B are plan views of the pneumatic tire 3 shown as a modification of the present embodiment as seen from the direction perpendicular to the tread portion, and the air flow generated when the pneumatic tire 3 rotates. It is a schematic diagram explaining AR.
- the land portion block 300 partitioned by the circumferential groove 20A and the lateral groove 42A includes a side surface 301 on the buttress portion 14 side, a side surface 302 provided on the opposite side of the side surface 301, and a land
- the side block 303 has a side surface 303 on the one end portion 300A side in the tire circumferential direction and a side surface 304 on the other end portion 300B side in the tire circumferential direction.
- the side surface 301 of the land block 300 is a curved surface, which is a convex curved surface toward the outer side in the tread width direction.
- the pneumatic tire 3 includes a side surface 301 of a land block 300 that is a convex curved surface toward the outer side in the tread width direction. Therefore, as shown in FIG. 6A, when the pneumatic tire 3 rotates in the rotation direction R ⁇ b> 1, the air flow (relative wind) AR caused by the rotation collides with the side surface 303, and the lateral groove from the side surface 301. 42A. For this reason, the air around the pneumatic tire 3 is taken into the lateral groove 42A, and the flow rate of the air flowing through the lateral groove 42A can be increased. Thereby, the heat transfer coefficient inside the lateral groove 42A is improved, and the effect of reducing the temperature of the land block 300 can be enhanced.
- FIGS. 7A and 7B are plan views of the pneumatic tire 4 shown as a modification of the present embodiment as seen from the direction perpendicular to the tread portion, and the air flow generated when the pneumatic tire 4 rotates. It is a schematic diagram explaining AR.
- the land portion block 400 defined by the circumferential groove 20A and the lateral groove 43A includes a side surface 401 on the buttress portion 14 side, a side surface 402 provided on the opposite side of the side surface 401, and a land
- the side block 403 has a side surface 403 on one end 400A side in the tire circumferential direction and a side surface 404 on the other end 400B side in the tire circumferential direction.
- the side surface 401 of the land block 400 is a curved surface.
- the curved surface 401 includes a curved surface portion 401a that is a convex curved surface toward the outer side in the tread width direction and a curved surface portion 401b that is a curved surface convex toward the inner side in the tread width direction in plan view of the tread portion.
- the curved surface portion 401a and the curved surface portion 401b are continuous via an inflection point.
- FIG. 8 is an enlarged perspective view in which a tread portion of a pneumatic tire 5 shown as a modified example of the present embodiment is enlarged.
- 9A and 9B are plan views seen from the direction of arrow B in FIG.
- the land portion block 500 includes a side surface 501 on the buttress portion 14 side, a side surface 502 provided on the opposite side of the side surface 501, a side surface 503 on one end portion 500A side in the tire circumferential direction of the land portion block 100, and a tire circumferential direction. Side surface 504 on the other end portion 500B side.
- a round shape 500 ⁇ / b> R is formed in a portion where the top of the surface 500 ⁇ / b> S, the side surface 501, and the side surface 504 of the tread portion that contacts the road surface of the land block 500 of the pneumatic tire 5 is formed. That is, the vertices of the surface 500S, the side surface 501, and the side surface 504 are chamfered.
- FIG. 9 in the plan view seen from the direction of arrow B in FIG. 8, the area of the surface 500 ⁇ / b> S of the tread portion that contacts the road surface of the land block 500 of the pneumatic tire 5 is continuous with the groove bottom 40 ⁇ / b> Ab of the lateral groove 40.
- the area of the land block 500 is smaller.
- the land block 500 has a larger area from the surface 500S in contact with the road surface toward the connecting portion between the groove bottom 40Ab.
- one end portion 500A in the tire circumferential direction of the land block 500 rotates in the forward direction when the pneumatic tire 5 is attached to the vehicle. It is located in front of (arrow R1 shown in FIG. 5).
- the other end 500B in the tire circumferential direction of the land block 500 is located on the rear side in the rotation direction R1.
- the length Lb8 in the tread width direction at the end portion 500A is longer than the length La8 in the tread width direction at the end portion 500A of the land block 500.
- the round shape 500R is formed at the portion where the top surface 500S, the side surface 501, and the side surface 504 of the tread portion that contacts the road surface of the land block 500 of the pneumatic tire 5 are formed. Therefore, as shown in FIG. 9A, when the pneumatic tire 5 rotates in the rotation direction R1, the air flow AR1 flowing on the side surface 501 of the land block 500 and the air flow flowing on the surface 500S. AR2 collides with the side surface 503 and is easily taken into the lateral groove 40A. Thereby, the heat transfer coefficient inside the lateral groove 40A is improved, and the effect of reducing the temperature of the land block 500 can be enhanced.
- FIG. 10 is an enlarged perspective view in which a tread portion of a pneumatic tire 6 shown as a modification of the present embodiment is enlarged.
- a round shape 600 ⁇ / b> R is formed in a portion where the top of the surface 600 ⁇ / b> S, the side surface 601, and the side surface 604 of the tread portion that contacts the road surface of the land block 600 of the pneumatic tire 6 is formed. That is, the vertices of the surface 600S, the side surface 601, and the side surface 604 are chamfered.
- the length La8 in the tread width direction at the end portion 600A in the tire circumferential direction of the land block 600 is equal to the length Lb8 in the tread width direction at the end portion 600B.
- the round shape 600R is formed at the portion where the top surface of the tread portion 600S, the side surface 601, and the side surface 604 of the tread portion that contacts the road surface of the land block 600 of the pneumatic tire 6 is formed.
- the air flow AR1 flowing through the side surface 601 is easily taken into the lateral groove 40A, and the air flow AR2 flowing through the surface 500S is easily taken into the horizontal groove 40A.
- the heat transfer rate inside the lateral groove 43A is improved, and the effect of reducing the temperature of the land block 400 can be enhanced.
- FIG. 11 is an enlarged perspective view in which a tread portion of a pneumatic tire 7 shown as a modified example of the present embodiment is enlarged.
- the width of the land block 700 along the tire circumferential direction is kept constant from one side to the other side in the tire circumferential direction.
- the side surfaces 701 and 702 along the tire circumferential direction are inclined toward the tire equator line side from one side to the other side in the tire circumferential direction.
- the outer side surface 701 in the tire width direction may be parallel to the tire equator line. That is, it does not have to be inclined toward the tire equator line.
- FIG. 12 is a view showing a pneumatic tire 7 shown as a modified example of the present embodiment.
- the pneumatic tire 7 according to the modified example 7 includes a land block 800, circumferential grooves (circumferential grooves 820A and 820B), and lateral grooves (lateral grooves 840A and 840B). Have.
- the land block 800 is partitioned by a circumferential groove and a lateral groove.
- a land portion block 800 that is adjacent to the buttress portion and is partitioned by the circumferential groove 820A and the lateral groove 840A will be described.
- the circumferential groove 820A and the circumferential groove 820B are grooves extending in the tire circumferential direction tc.
- the circumferential groove 820A and the circumferential groove 820B extend along the tire equator line CL.
- the lateral grooves 840A and 840B are grooves extending in the tread width direction.
- the lateral groove 840A and the lateral groove 840B are inclined with respect to a tread width direction line TL (that is, a line orthogonal to the tire equator line CL) along the tread width direction.
- TL that is, a line orthogonal to the tire equator line CL
- the lateral groove 840A is inclined toward the Y side toward the outer side in the tread width direction
- the lateral groove 840B is inclined toward the X side toward the outer side in the tread width direction.
- the groove depth of the circumferential groove (circumferential groove 820A and circumferential groove 820B) is larger than the groove width of the circumferential groove (circumferential groove 820A and circumferential groove 820B).
- the groove width of the lateral groove (lateral groove 840A and lateral groove 840B) is larger than the groove width of the circumferential groove (circumferential groove 820A and circumferential groove 820B).
- the groove depth of the lateral grooves (lateral grooves 840A and 840B) is in the range of 40 mm to 250 mm. It should be noted that such a configuration is a configuration related to a heavy duty tire.
- groove width indicates the groove width (maximum groove width) of the portion having the largest groove width.
- the groove width of the horizontal groove may expand from the inner side in the tread width direction toward the outer side in the tread width direction.
- the land portion block 800 partitioned by the lateral groove 840A includes a side surface 801 on the buttress portion 14 side, a side surface 802 provided on the opposite side of the side surface 801, a side surface 803 provided on the X side in the tire circumferential direction, and a tire circumferential direction. And a side surface 804 provided on the Y side.
- the length La7 of the side surface 803 is shorter than the length Lb7 of the side surface 804.
- the side surface 801 has an inclination with respect to a line (tire equator line CL) along the tire circumferential direction. Specifically, the side surface 801 is inclined inward in the tread width direction toward the Y side.
- the horizontal groove 840A is inclined to the Y side toward the outer side in the tread width direction. Accordingly, when the rotation direction is the X side, the air in the lateral groove 840A is guided to the outer side in the tread width direction by the rotation of the pneumatic tire 8, so that the effect of reducing the temperature of the land block 800 is obtained.
- the land portion block 800 defined by the lateral groove 840B includes a side surface 801 on the buttress portion 14 side, a side surface 802 provided on the opposite side of the side surface 801, a side surface 803 provided on the Y side in the tire circumferential direction, and a tire. And a side surface 804 provided on the X side in the circumferential direction. It should be noted that in the land portion block 800 defined by the lateral groove 840B, the side surface 801 is inclined inward in the tread width direction toward the X side.
- the horizontal groove 840B is inclined to the X side toward the outer side in the tread width direction. Accordingly, when the rotation direction is the Y side, the air in the lateral groove 840B is guided to the outer side in the tread width direction by the rotation of the pneumatic tire 8, so that the effect of reducing the temperature of the land block 800 is obtained.
- FIG. 13 is a view showing a pneumatic tire 7 shown as a modification of the present embodiment.
- the modification 8 is the same as the modification 7 except that the inclination of the side surface 801 is different.
- the lateral groove 840A is inclined toward the Y side toward the outer side in the tread width direction
- the lateral groove 840B is inclined toward the X side toward the outer side in the tread width direction.
- the land portion block 800 defined by the lateral groove 840A includes a side surface 801 on the buttress portion 14 side, a side surface 802 provided on the opposite side of the side surface 801, a side surface 803 provided on the Y side in the tire circumferential direction, and a tire circumferential direction. And a side surface 804 provided on the X side.
- the side surface 801 is inclined inward in the tread width direction toward the X side.
- the rotation direction is the Y side
- the air that flows in the direction opposite to the rotation direction collides with the side surface 803 due to the rotation of the pneumatic tire 8, and the lateral groove 840A is inclined to the Y side toward the outer side in the tread width direction. Air is taken in.
- the heat transfer coefficient inside the lateral groove 840A is improved, and the effect of reducing the temperature of the land block 800 is obtained.
- the land portion block 800 defined by the lateral groove 840B includes a side surface 801 on the buttress portion 14 side, a side surface 802 provided on the opposite side of the side surface 801, a side surface 803 provided on the X side in the tire circumferential direction, and a tire. And a side surface 804 provided on the Y side in the circumferential direction.
- the side surface 801 is inclined inward in the tread width direction toward the Y side.
- the rotation direction is the X side
- the air that flows in the direction opposite to the rotation direction collides with the side surface 803 due to the rotation of the pneumatic tire 8, and the lateral groove 840B tilts toward the X side toward the outer side in the tread width direction. Air is taken in.
- the heat transfer coefficient inside the lateral groove 840B is improved, and the effect of reducing the temperature of the land block 800 is obtained.
- FIG. 14 is a diagram illustrating a land block shown as a ninth modification of the present embodiment. Specifically, FIG. 14A and FIG. 14B are diagrams for explaining the groove end reference line RL.
- the circumferential groove 20A has a zigzag shape along the tire circumferential direction.
- the groove end reference line RL is a straight line extending in the tire circumferential direction, and is defined by the inner end portion in the tread width direction of the lateral groove 40A adjacent to the land block 100 in the tire circumferential direction.
- the groove end reference line RL is, for example, as shown in FIGS. 14A and 14B, in the tread width direction inner end of the lateral groove 40 ⁇ / b> A adjacent to the land block 100 in the tire circumferential direction.
- a straight line passing through the outermost point in the tread width direction and extending along the tire circumferential direction may be used.
- the groove end reference line RL passes along the tire circumferential direction through the outermost point in the tread width direction among the inner ends of the lateral grooves 40A adjacent to each other across the land block 100 in the tire circumferential direction. It may be a straight line extending. Alternatively, the groove end reference line RL is the innermost point in the tread width direction and the outermost point in the tread width direction among the inner ends of the tread width direction of the adjacent lateral grooves 40A across the land block 100 in the tire circumferential direction. A straight line that passes through the intermediate point between the tire and the tire and extends along the tire circumferential direction.
- the groove end reference line RL is a reference line that defines a length La1 in the tread width direction and a length Lb1 in the tread width direction. That is, the length La1 in the tread width direction and the length Lb1 in the tread width direction are the lengths from the groove end reference line RL to the tread end, as shown in FIGS. 14 (a) and 14 (b).
- the modification 9 illustrates the case where the circumferential groove 20A has a zigzag shape along the tire circumferential direction
- the embodiment is not limited thereto.
- the length La1 in the tread width direction and the length Lb1 in the tread width direction are set by the groove end reference line RL determined by the inner end of the lateral groove 40A in the tread width direction. It is possible to define.
- the pneumatic tire according to the present embodiment has a remarkable effect when applied to a so-called super-large tire, but can also be applied to a general-purpose tire.
- Heat transfer of pneumatic tires by forming a notch on the side (buttress) of the land that intersects the width direction of the tread, notched from the side to the inside of the land and communicating with the lateral groove
- 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 groove 40, lateral groove 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 length Lb in the tread width direction at the end portion 100A is shorter than the length La in the tread width direction at the end portion 100A of the land block 100.
- the end portion 100B on the rear side in the rotational direction of the land block 100 in the tire circumferential direction is positioned on the inner side in the tread width direction by the length Lw from the sidewall portion 12, the end portion 100B is opposite to the rotational direction R.
- the air flow (relative wind) AR can collide with the end portion 100A of the land block 100 disposed on the rear side in the rotation direction. Therefore, La> Lb is not necessarily satisfied.
- FIGS. 1 to 10 the shape of the side surface of the land block has been described only on the outer side in the tire width direction, but as shown in FIG. 11, both side surfaces along the tire circumferential direction are illustrated.
- the shape described with reference to FIGS. 1 to 10 can also be used.
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Abstract
Description
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trに沿った断面図である。
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、図3の矢印A方向からみた平面図である。周方向陸部30Aが横溝40Aによって分割されてできる陸部ブロック100は、バットレス部14側の側面101と、側面101の反対側に設けられる側面102と、陸部ブロック100のタイヤ周方向の一方の端部100A側の側面103と、タイヤ周方向の他方の端部100B側の側面104とを有する。
空気入りタイヤ1では、陸部ブロック100のタイヤ周方向の回転方向後側の端部100Bは、サイドウォール部12から長さLwだけトレッド幅方向の内側に位置している。
(4-1)変形例1
図5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R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、周方向陸部30A,30B,30C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がトレッド幅方向に沿ったトレッド幅方向線TLに対して角度θだけ傾斜している。
図6(a),(b)は、本実施形態の変形例として示す空気入りタイヤ3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3が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2として示す空気入りタイヤ3では、周方向溝20A及び横溝42Aによって区画される陸部ブロック300は、バットレス部14側の側面301と、側面301の反対側に設けられる側面302と、陸部ブロック300のタイヤ周方向の一方の端部300A側の側面303と、タイヤ周方向の他方の端部300B側の側面304とを有する。本実施形態では、陸部ブロック300の側面301は、曲面であり、トレッド幅方向外側に向けて凸状の曲面になっている。
図7(a),(b)は、本実施形態の変形例として示す空気入りタイヤ4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4が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3として示す空気入りタイヤ4では、周方向溝20A及び横溝43Aによって区画される陸部ブロック400は、バットレス部14側の側面401と、側面401の反対側に設けられる側面402と、陸部ブロック400のタイヤ周方向の一方の端部400A側の側面403と、タイヤ周方向の他方の端部400B側の側面404とを有する。本実施形態では、陸部ブロック400の側面401は曲面である。曲面である401は、トレッド部の平面視において、トレッド幅方向外側に向けて凸状の曲面である曲面部401aと、トレッド幅方向内側に向けて凸状の曲面である曲面部401bとから構成されている。曲面部401aと曲面部401bとは変曲点を介して連続している。
図8は、本実施形態の変形例として示す空気入りタイヤ5のトレッド部を拡大した拡大斜視図である。図9(a),(b)は、図8の矢印B方向からみた平面図である。
図10は、本実施形態の変形例として示す空気入りタイヤ6のトレッド部を拡大した拡大斜視図である。空気入りタイヤ6の陸部ブロック600の路面に当接するトレッド部の表面600Sと側面601と側面604との頂点が形成される部分には、ラウンド形状600Rが形成されている。すなわち、表面600Sと側面601と側面604との頂点が面取りされている。図9に示すように、陸部ブロック600のタイヤ周方向の端部600Aにおけるトレッド幅方向の長さLa8と、端部600Bにおけるトレッド幅方向の長さLb8とは等しい。
図11は、本実施形態の変形例として示す空気入りタイヤ7のトレッド部を拡大した拡大斜視図である。空気入りタイヤ7では、タイヤ周方向に沿った陸部ブロック700の幅は、タイヤ周方向の一方から他方に向かい一定に保たれている。
図12は、本実施形態の変形例として示す空気入りタイヤ7を示す図である。図12に示すように、変形例7に係る空気入りタイヤ7は、陸部ブロック800と、周方向溝(周方向溝820A及び周方向溝820B)と、横溝(横溝840A及び横溝840B)とを有する。
図13は、本実施形態の変形例として示す空気入りタイヤ7を示す図である。なお、変形例8では、側面801の傾きが異なる点を除いて、変形例7と同様である。詳細には、横溝840Aは、トレッド幅方向外側に向けてY側に傾いており、横溝840Bは、トレッド幅方向外側に向けてX側に傾いている。
変形例9では、溝端基準線について説明する。図14は、本実施形態の変形例9として示す陸部ブロックを示す図である。具体的には、図14(a)及び図14(b)は、溝端基準線RLについて説明するための図である。
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。例えば、本発明の実施形態は、次のように変更することができる。
Claims (11)
- ビード部と、前記ビード部に連なるサイドウォール部と、路面に当接するトレッド部と、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する重荷重用タイヤであって、
前記トレッド部には、少なくとも一方の端部がトレッド端に開口し、タイヤ周方向に交差する複数の横溝部と、前記横溝部によって区画され、前記トレッド部の幅方向に交差する側面を有する陸部とが形成され、
前記陸部のトレッド幅方向の長さは、タイヤ周方向の一方から他方に向かうに連れて短くなるように形成されており、
前記陸部のトレッド幅方向の長さは、タイヤ周方向に沿って延びる溝端基準線から前記トレッド端までの長さであり、
前記溝端基準線は、タイヤ周方向において前記陸部を挟んで隣り合う前記横溝部のトレッド幅方向内側端によって定められる重荷重用タイヤ。 - 前記陸部を含むバットレス部のタイヤ周方向の一方の端部におけるトレッド幅方向の長さは、前記陸部を含むバットレス部のタイヤ周方向の他方の端部におけるトレッド幅方向の長さよりも短い請求項1に記載の重荷重用タイヤ。
- 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いる請求項1に記載の重荷重用タイヤ。
- タイヤ周方向に沿った周方向溝部が形成されており、
前記横溝部は、前記周方向溝部に連通されている請求項1に記載の重荷重用タイヤ。 - タイヤ周方向に沿った周方向溝部が形成されており、
前記周方向溝部の溝深さは、前記周方向溝部の溝幅よりも大きい請求項1に記載の重荷重用タイヤ。 - タイヤ周方向に沿った周方向溝部が形成されており、
前記横溝部の溝幅は、前記周方向溝部の溝幅よりも大きい請求項1に記載の重荷重用タイヤ。 - 前記トレッド部の平面視において、前記陸部の前記トレッド部の幅方向に交差する側面は、曲線である請求項1に記載の重荷重用タイヤ。
- 前記トレッド部の平面視において、前記陸部の前記トレッド部の幅方向に交差する側面は、変曲点を有する曲線である請求項7に記載の重荷重用タイヤ。
- 路面に当接するトレッド部の表面における前記陸部の面積は、前記横溝部の溝底部に連なる部分における前記陸部の面積よりも小さい請求項1に記載の重荷重用タイヤ。
- 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、
前記陸部のタイヤ周方向の一方の端部におけるトレッド幅方向の長さは、
前記陸部の前記側面と前記横溝部の壁面とのなす角が鈍角になる前記陸部の端部におけるトレッド幅方向の長さよりも長い請求項1に記載の重荷重用タイヤ。 - 前記重荷重用タイヤが建設車両用タイヤであることを特徴とする請求項1乃至請求項10のいずれか1項に記載の重荷重用タイヤ。
Priority Applications (6)
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CN201180024851.4A CN102905912B (zh) | 2010-05-20 | 2011-05-20 | 重载轮胎 |
AU2011255847A AU2011255847B2 (en) | 2010-05-20 | 2011-05-20 | Heavy duty tire |
EP11783653.6A EP2574478B1 (en) | 2010-05-20 | 2011-05-20 | Heavy duty tire |
ES11783653.6T ES2597628T3 (es) | 2010-05-20 | 2011-05-20 | Neumático para trabajo pesado |
JP2012515942A JP5856051B2 (ja) | 2010-05-20 | 2011-05-20 | 重荷重用タイヤ |
US13/698,878 US9586445B2 (en) | 2010-05-20 | 2011-05-20 | Heavy duty tire |
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JP2010-116022 | 2010-05-20 | ||
JP2010116022 | 2010-05-20 |
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PCT/JP2011/061649 WO2011145721A1 (ja) | 2010-05-20 | 2011-05-20 | 重荷重用タイヤ |
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US (1) | US9586445B2 (ja) |
EP (1) | EP2574478B1 (ja) |
JP (1) | JP5856051B2 (ja) |
CN (1) | CN102905912B (ja) |
AU (1) | AU2011255847B2 (ja) |
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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 |
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AU2012341419B2 (en) * | 2011-11-22 | 2015-08-13 | Bridgestone Corporation | Tire |
CN104070934B (zh) * | 2013-03-25 | 2016-12-28 | 陈政通 | 轮胎结构 |
JP6176624B2 (ja) * | 2013-06-11 | 2017-08-09 | 東洋ゴム工業株式会社 | 空気入りタイヤ |
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FR3042737B1 (fr) * | 2015-10-27 | 2017-11-24 | Michelin & Cie | Pneumatique a couches de travail comprenant des monofilaments et a bande de roulement incisee |
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JP2014156246A (ja) * | 2014-06-04 | 2014-08-28 | Bridgestone Corp | タイヤ |
WO2016147843A1 (ja) * | 2015-03-18 | 2016-09-22 | 株式会社ブリヂストン | タイヤ |
WO2016147842A1 (ja) * | 2015-03-18 | 2016-09-22 | 株式会社ブリヂストン | タイヤ |
WO2016152387A1 (ja) * | 2015-03-23 | 2016-09-29 | 株式会社ブリヂストン | タイヤ |
CN107428206A (zh) * | 2015-03-23 | 2017-12-01 | 株式会社普利司通 | 轮胎 |
CN107428206B (zh) * | 2015-03-23 | 2019-08-02 | 株式会社普利司通 | 轮胎 |
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 |
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US9586445B2 (en) | 2017-03-07 |
US20130118664A1 (en) | 2013-05-16 |
ES2597628T3 (es) | 2017-01-19 |
JPWO2011145721A1 (ja) | 2013-07-22 |
EP2574478A1 (en) | 2013-04-03 |
AU2011255847A1 (en) | 2013-01-10 |
AU2011255847B2 (en) | 2014-03-13 |
EP2574478A4 (en) | 2014-08-13 |
AU2011255847A9 (en) | 2013-08-29 |
CN102905912A (zh) | 2013-01-30 |
JP5856051B2 (ja) | 2016-02-09 |
EP2574478B1 (en) | 2016-07-27 |
CN102905912B (zh) | 2015-01-21 |
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