WO2016013601A1 - 重荷重用空気入りタイヤ - Google Patents
重荷重用空気入りタイヤ Download PDFInfo
- Publication number
- WO2016013601A1 WO2016013601A1 PCT/JP2015/070931 JP2015070931W WO2016013601A1 WO 2016013601 A1 WO2016013601 A1 WO 2016013601A1 JP 2015070931 W JP2015070931 W JP 2015070931W WO 2016013601 A1 WO2016013601 A1 WO 2016013601A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- groove
- tire
- center
- tread
- width direction
- Prior art date
Links
Images
Classifications
-
- 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
-
- 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0339—Grooves
- B60C2011/0341—Circumferential grooves
- B60C2011/0346—Circumferential grooves with zigzag shape
-
- 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
- B60C2011/0355—Circumferential grooves characterised by depth
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0339—Grooves
- B60C2011/0358—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane
- B60C2011/0365—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane characterised by width
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
- B60C11/1353—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove bottom
- B60C2011/1361—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove bottom with protrusions extending from the groove bottom
-
- 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 heavy duty pneumatic tire with a tread pattern.
- a heavy-duty pneumatic tire that improves both traction during bad road travel and wet performance during high speed travel until the end of wear (Patent Document 1).
- the heavy-duty pneumatic tire at least one circumferential groove extending in the circumferential direction, and a large number of lateral grooves that are connected to the circumferential groove and are spaced apart on both sides of the circumferential groove in the circumferential direction
- the circumferential groove extends in the circumferential direction in a tread central region corresponding to 50% of the tread width
- the groove depth of the circumferential groove is 5% or more of the tread width, (3)
- the groove depth of the transverse grooves provided at least on both sides of the tread is 109% or more of the groove depth of the circumferential grooves.
- the traction property at the end of wear can be improved, but the wear in the tread center region progresses faster than the tread shoulder region until the end of wear.
- tread center It is preferable to improve the wear resistance of the region from the viewpoint of effectively using the tire.
- An object of the present invention is to provide a heavy-duty pneumatic tire with a tread pattern, which can improve the wear resistance of the tread center region while maintaining at least traction performance.
- the tread pattern is A plurality of tire circumferential directions are provided at intervals, extending to each of the first tread region and the second tread region in the tire width direction with respect to the tire equator line so as to cross the tire equator line.
- a center lug groove having, A plurality of shoulder lug grooves which are provided at intervals in the tire circumferential direction and extend outward in the tire width direction in each of the half tread regions, and open at the ground contact ends on both sides in the tire width direction.
- shoulder lug grooves provided one by one between the ends of adjacent center lug grooves adjacent to each other in the tire circumferential direction among the center lug grooves, In each of the half tread regions, the center lug groove end and the shoulder lug groove inner end in the tire width direction are alternately connected so as to be formed in a wave shape over the entire circumference of the tire circumference.
- a pair of circumferential main grooves provided in the half-tread region; A center block defined by the center lug groove and the pair of circumferential main grooves and formed in a row in the tire circumferential direction.
- the circumferential main groove is provided in a region separated by a distance of 30 to 60% of half of the tread width T on both sides in the tire width direction from the tire equator line in the tread portion.
- the ratio c / T of the wavy deflection width c of the pair of circumferential main grooves to the tread width T is 0.05 to 0.15
- the ratio P3 / LB of the groove width P3 of the center lug groove to the maximum length LB of the center block in the tire circumferential direction is 0.03 to 0.07.
- Each of the center lug grooves is bent or curved so as to protrude toward the third side in the tire circumferential direction on the first side, and the first in the tire circumferential direction on the second side.
- a second groove bent portion that bends or curves so as to protrude to the fourth side that is opposite to the third side,
- the first connection end portion on the first side and the second connection end portion on the second side where the center lug groove is connected to the circumferential main groove are on the inner side in the tire width direction of the circumferential main groove.
- the second connection end of the center lug groove is on the third side in the tire circumferential direction from the first connection end, With respect to the center position in the groove width direction of the center lug groove, the first straight tire width connecting the first connecting end portion and the protruding end at which the first groove bent portion protrudes toward the third side in the tire circumferential direction.
- the center lug groove of the center lug groove between the projecting end where the first groove bent portion projects toward the third side in the tire circumferential direction and the first connection end portion is on the first straight line or on the third side with respect to the first straight line, and the second groove bending portion protrudes on the fourth side in the tire circumferential direction and the second end.
- the portion of the center lug groove between the connection end portion is preferably on the second straight line or on the fourth side with respect to the second straight line.
- Each of the pair of circumferential main grooves preferably includes a bottom-up portion whose groove depth is partially shallow.
- the ratio D2 / T is preferably less than 0.05.
- a circumferential sub-groove that connects between the center lug grooves adjacent in the tire circumferential direction among the center lug grooves is provided,
- the circumferential sub-groove preferably has a curved or curved groove bent portion.
- a circumferential sub-groove that connects between the center lug grooves adjacent in the tire circumferential direction among the center lug grooves is provided,
- the connection positions of the circumferential sub-groove and the center lug groove are sandwiched between the first groove bent portion and the second groove bent portion including the first groove bent portion and the second groove bent portion. It is preferable that it exists in the area
- the ratio P4 / WB of the groove width P4 of the circumferential subgroove to the maximum width WB of the center block in the tire width direction is preferably 0.02 to 0.07.
- the ratio LB / WB of the maximum length LB in the tire circumferential direction of the center block to the maximum width WB in the tire width direction of the center block is preferably 0.6 to 0.8.
- the pair of circumferential main grooves have a first groove bent portion bent or curved outward in the tire width direction and a second groove bent portion bent or curved inward in the tire width direction so as to form a wave shape.
- each of the top portions of the center block formed corresponding to the first groove bent portion is an obtuse angle portion.
- the groove widths of the pair of circumferential main grooves and the center lug groove are preferably 7 to 20 mm.
- the heavy duty pneumatic tire is mounted on a construction vehicle or an industrial vehicle.
- the tire width direction refers to the rotation center axis direction of the pneumatic tire
- the tire circumferential direction refers to the rotation direction of the rotation surface of the tread surface that is formed when the tire is rotated around the tire rotation center axis.
- the tire radial direction refers to a direction radially extending from the tire rotation center axis.
- the outer side in the tire radial direction refers to the side away from the tire rotation center axis
- the inner side in the tire radial direction refers to the side closer to the tire rotation center axis.
- the outer side in the tire width direction means a side away from the tire equator line in the tire width direction
- the inner side in the tire width direction means a side closer to the tire equator line in the tire width direction.
- the heavy-duty pneumatic tire referred to in this specification is not only the tire described in Chapter C of JATMA (Japan Automobile Tire Association Standard) YEAR BOOK 2014, but also one type (dump truck, Scraper) tire, 2 types (Grada) tire, 3 types (excavator loader) tire, 4 types (tire roller) tire, mobile crane (truck crane, wheel crane) tire, or TRA 2013 YEAR BOOK Vehicle tires described in SECTION 4 or section 6.
- FIG. 1 is a cross-sectional view of a pneumatic tire (hereinafter simply referred to as a tire) of this embodiment.
- FIG. 1 is a cross-sectional view taken along the plane XX ′ in FIG. 2 to be described later and passing through the tire rotation axis.
- R the tire radial direction
- W the tire width direction
- a tire 1 shown in FIG. 1 has a tread portion 2, a sidewall portion 3, and a bead portion 4.
- the bead part 4 has a pair of bead cores 4a on both sides in the tire width direction.
- a carcass layer 5 is mounted between the pair of bead cores 4a. Both ends of the carcass layer 5 are folded back from the tire inner side to the outer side around the bead core 4a.
- the carcass layer 5 may be composed of a single carcass ply or a plurality of carcass plies.
- a belt layer 6 is provided on the outer peripheral side of the carcass layer 5 in the tread portion 2.
- the belt layer 6 includes a first cross belt layer 6a, a second cross belt layer 6b, and a third cross belt layer 6c in the order along the direction from the inner side to the outer side in the tire radial direction. Is provided.
- Each of the first cross belt layer 6a, the second cross belt layer 6b, and the third cross belt layer 6c includes two belts.
- the reinforcing cords are inclined to different sides with respect to the tire circumferential direction.
- the belt positioned on the inner side in the tire radial direction has a tire width compared to the belt positioned on the outer side in the tire radial direction.
- the belt width in the direction is narrow.
- the belt positioned on the inner side in the tire radial direction has a wider belt width in the tire width direction than the belt positioned on the outer side in the tire radial direction.
- the belt located inside in the tire radial direction has a wider belt width in the tire width direction than the belt located outside in the tire radial direction.
- the belt width is not particularly limited, and the form of the belt width shown in FIG.
- the belt layer 6 is comprised by three cross belt layers, it may be comprised by two cross belt layers and there is no restriction
- a sheet-like rubber layer may be partially provided between the belt layers of the second cross belt layer 6b.
- the inclination angle of the belt cord having the lowest angle with respect to the tire circumferential direction among the reinforcing cords of the respective belts of the first cross belt layer 6a with respect to the tire circumferential direction is 20 to 24 degrees. This is preferable in that a so-called tagging effect in which the belt suppresses deformation that tends to expand in the radial direction can be effectively obtained.
- the inclination angle of the belt cord having the lowest angle with respect to the tire circumferential direction with respect to the tire circumferential direction is 16 to 20 degrees. It is preferable from the point that can be obtained.
- the inclination angle of the belt cord having the lowest angle with respect to the tire circumferential direction among the reinforcing cords of the respective belts of the third cross belt layer 16c is preferably 22 to 26 degrees.
- the inclination angle in the reinforcing cord of each belt of the first cross belt layer 16a is preferably larger than the inclination angle in the second cross belt layer 6b.
- Such a configuration of the tire 1 is an example, and the tire 1 may have other known configurations.
- FIG. 2 is a pattern diagram in which a tread pattern provided on the tread portion 2 of the tire 1 is developed in a plane.
- the tire circumferential direction is indicated by C
- the tire width direction is indicated by W.
- the tread portion 2 includes a shoulder lug groove 10, a pair of circumferential main grooves 12, a center lug groove 14, and a center block 16 as a tread pattern.
- a plurality of shoulder lug grooves 10 are provided at intervals in the tire circumferential direction in each of the half tread regions on both sides (first side and second side) in the tire width direction with respect to the tire equator line CL. Yes.
- the shoulder lug groove 10 extends outward in the tire width direction in each of the half tread regions on both sides in the tire width direction with respect to the tire equator line CL, and the outer ends in the tire width direction are on both sides in the tire width direction.
- the tread end 18 is a portion where the outer shapes of the tread portion 2 and the side portion 3 are connected. When the connecting portion is rounded, the outer shape of the tread portion 2 is changed to this shape.
- the shoulder lug grooves 10 located on both sides in the tire width direction, the position of one shoulder lug groove 10 in the tire circumferential direction in one half tread region is the tire of two adjacent shoulder lug grooves in the other half tread region. Between the circumferential positions. Furthermore, the shoulder lug groove 10 has a position in the tire width direction at the inner end in the tire width direction of the shoulder lug groove 10 at a position in the tire width direction at the end of the center lug groove 14 to be described later in each half tread region.
- the shoulder lug grooves 10 are provided one by one in the shoulder region between adjacent center lug grooves 14 adjacent to each other in the tire circumferential direction among the center lug grooves 14 in the tire circumferential direction. ing. Thereby, the circumferential main groove 12 described later forms a wave shape by alternately connecting the end of the center lug groove 14 and the inner end of the shoulder lug groove 10 in the tire width direction.
- the pair of circumferential main grooves 12 are provided in the half-tread regions on both sides (first side and second side) in the tire width direction with respect to the tire equator line CL.
- Each of the circumferential main grooves 12 has a wave shape over the entire circumference of the tire circumference by alternately connecting an end of a center lug groove 14 described later and an inner end of the shoulder lug groove 10 in the tire width direction in each of the half tread regions. Is formed.
- the groove width of the pair of circumferential main grooves 12 is narrower than the groove width of the shoulder lug grooves 10.
- a groove having a wave shape means a shape in which the groove meanders, and a groove bent portion (third groove bent portion and fourth groove bent) that curves in a convex shape with respect to the outer side or the inner side in the tire width direction forming the wave shape of the groove.
- the part may have a square shape or a rounded curved shape.
- the curved shape includes a shape in which the corner of the rubber block that is in contact with the angular portion of the groove with a radius of curvature is rounded, that is, a curved shape of the groove that is formed by chamfering the corner of the rubber block.
- the portions other than the groove bent portions may be linear or curved.
- the two curved shapes have the same curvature.
- a curved shape with a radius may be used.
- one of two groove bent portions (third groove bent portion and fourth groove bent portion) adjacent to each other in the tire circumferential direction is a bent groove formed by connecting a linear shape and a curved groove. It is good also as a bending part and making the other into a curved groove bending part.
- the circumferential main groove 12 has a groove bent portion 11 (a third groove bent portion 11a and a fourth groove bent portion 11b) that bends outward and inward in the tire width direction on the tire circumference. And extending in the tire circumferential direction while meandering in a wavy shape in the tire width direction.
- Each of the pair of circumferential main grooves 12 is connected to the shoulder lug groove 10 at a third groove bent portion 11 a that is bent outwardly in the tire width direction of the groove bent portion 11.
- each of the pair of circumferential main grooves 12 is connected to the center lug groove 14 at a fourth groove bent portion 11 b that is bent in the tire width direction inside of the groove bent portion 11.
- the position of the fourth groove bending portion 11b in the tire circumferential direction is displaced with respect to the fourth groove bending portion 11b in the opposite half tread region. Accordingly, the center lug groove 14 extends in a direction inclined with respect to the tire width direction. Further, the groove width of the pair of circumferential main grooves 12 is narrower than that of the shoulder lug groove 10.
- a plurality of center lug grooves 14 are provided at intervals in the tire circumferential direction.
- the center lug groove 14 has both ends extending to the half tread regions on both sides (first side and second side) in the tire width direction with respect to the tire equator line CL so as to cross the tire equator line CL.
- Both ends of the center lug groove 14 are grooves that connect the fourth groove bent portions 11b that bend in the tire width direction inside the groove bent portions 11 in the pair of circumferential main grooves 12 to be bent. .
- the center lug groove 14 intersects the tire equator line CL.
- the wave shapes of the pair of circumferential main grooves 12 are both wave shapes having a predetermined wavelength, and the phases of the two wave shapes in the tire circumferential direction are shifted from each other by approximately a half pitch. That is, the position in the tire circumferential direction of the third groove bent portion 11a of one circumferential main groove 12 of the pair of circumferential main grooves 12 is the third adjacent to the tire circumferential direction of the other circumferential main groove 12. It exists between the positions in the tire circumferential direction of the groove bending part 11a. Of the pair of circumferential main grooves 12, the third groove bent portion 11a of one circumferential main groove 12 and the fourth groove bent portion 11b of the other circumferential main groove 12 are provided at substantially the same position in the tire circumferential direction. It has been.
- the center lug groove 14 is provided with two bent first groove bent portions 14a and second groove bent portions 14b.
- FIG. 3 is an enlarged view showing the first groove bent portion 14a and the second groove bent portion 14b, which are the bent portions of the center lug groove 14.
- the first groove bending portion 14a is the upper side (third side) in FIG. 2 and FIG. 3 in the tire circumferential direction on the left side (first side) in FIG. 2 with respect to the tire equator line CL in the tire width direction.
- the second groove bent portion 14b is a portion bent or curved so as to protrude to the lower side (second side) of FIG. 3 in the tire circumferential direction on the right side (second side) of FIG.
- the first groove bent portion 14a and the second groove bent portion 14b are bent, but may be curved.
- the curved shape includes a shape in which the corner of the rubber block that is in contact with the angular portion of the groove with a radius of curvature is rounded, that is, a curved shape of the groove that is formed by chamfering the corner of the rubber block.
- the center lug groove 14 has a first groove bent portion 14a and a second groove bent portion 14b, and is thus displaced in a wave shape in the tire circumferential direction.
- the angle ⁇ see FIG.
- the center lug groove 14 formed by the first groove bent portion 14a and the second groove bent portion 14b is an obtuse angle. It is preferable that the shape becomes. It is preferable that the first groove bent portion 14a and the second groove bent portion 14b are provided on both sides of the tire equator line CL in the tire width direction at positions spaced apart from the tire equator line CL by the same distance. Of the center lug groove 14, the tire equator line CL is provided so as to pass through a portion between the first groove bent portion 14a and the second groove bent portion 14b. In this portion, the center lug with respect to the tire width direction is provided. It is preferable that the inclination direction of the groove 14 is different from that of the other portions.
- the center lug groove 14 of this embodiment has the structure containing the linear part extended linearly between a pair of circumferential direction main grooves 12, and the 1st groove bending part 14a and the 2nd groove bending part 14b, the above-mentioned A curved groove may be used instead of the straight portion. Further, one of the first groove bent portion 14a and the second groove bent portion 14b may be bent and the other may be curved. When the first groove bent portion 14a and the second groove bent portion 14b are formed in a curved shape and a curved groove is used instead of the linear portion, the two curved shapes may be curved shapes having the same curvature radius.
- one of the first groove bent portion 14a and the second groove bent portion 14b is a bent groove bent portion formed by connecting a linear shape and a curved groove, and the other is a curved groove bent. It is good also as a part.
- the shape of the center lug groove 14 may be a groove shape extending in the tire width direction while being displaced in the tire circumferential direction into a wave shape.
- a plurality of center blocks 16 defined by the center lug groove 14 and the circumferential main grooves 11A and 11B are formed in a row along the tire circumferential direction.
- a tire equator line (tire center line) CL passes through the center block 16.
- FIG. 4 is a diagram illustrating an example of a preferable shape of the center lug groove 14 that defines the shape of the center block 14.
- the first groove bent portion 14a of the center lug groove 14 is a third side in the tire circumferential direction on the first side (the left side in FIG. 4) with respect to the tire equator line CL (see FIG. 4). 3 is bent or curved so as to protrude toward the upper side in the drawing.
- the second groove bent portion 14b of the center lug groove 14 has a fourth side in the tire circumferential direction on the second side (the right side in the drawing in FIG. 4) with respect to the tire equator line CL (the lower side in the drawing in FIG. 3).
- the fourth side is opposite to the third side.
- the first connection end 14c on the first side where the center lug groove 14 is connected to the circumferential main groove 12 and the second connection end on the second side where the center lug groove 14 is connected to the circumferential main groove 12 The part 14d corresponds to the inner end of the circumferential circumferential groove 11 in the tire width direction, that is, the second groove bent parts 11b and 11b. Since the center lug groove 14 is inclined with respect to the tire width direction, the second connection end 14d of the center lug groove 14 is closer to the third side in the tire circumferential direction than the first connection end 14c (in FIG. 3). On the side of the paper on the top).
- the first groove bent portion 14 a and the first connection projecting from the third side in the tire circumferential direction (upward side in FIG. 3) and the first connection.
- An inclination angle of the first straight line 14e connecting the end portion 14c with respect to the tire width direction an inclination angle greater than 0 degrees and less than 90 degrees
- the second groove bending portion 14b protrude to the fourth side in the tire circumferential direction.
- the inclination angle (inclination angle greater than 0 degree and less than 90 degrees) of the second straight line 14f connecting the protruding end and the second connection end part 14d with respect to the tire width direction is the same as that of the first connection end part 14c of the center lug groove 14 and the second connection end part 14d. It is preferable that the inclination angle of the third straight line 14g connecting the two connection end portions 14d with respect to the tire width direction (inclination angle larger than 0 degree and smaller than 90 degrees) is larger.
- the first groove bent portion 14 a protrudes to the third side in the tire circumferential direction with respect to the center position in the groove width direction of the center lug groove 14.
- the portion of the center lug groove 14 between the end and the first connection end portion 14c is on the first straight line 14e or on the third side with respect to the first straight line 14e, and the second groove bent portion 14b is disposed on the tire circumference.
- the portion of the center lug groove 14 between the protruding end protruding to the fourth side in the direction and the second connection end 14d is on the second straight line 14f or on the fourth side with respect to the second straight line 14f.
- the tread rigidity of the center block 16 can be increased. That is, since the center block 16 has an anisotropic shape defined by the center lug groove 14 inclined in one direction with respect to the tire width direction, the center block 16 kicks away from the road surface from the tire contact surface. When this is done, the center block 16 is deformed by being twisted clockwise or counterclockwise by an anisotropic shape. At this time, since the groove width of the circumferential main groove 12 is narrow, the center block 16 includes a shoulder block adjacent to the circumferential width groove 12 in the tire width direction, a third groove bent portion 11a, and a fourth groove bent portion.
- the center blocks 16 adjacent to each other in the tire circumferential direction across the center lug groove 14 are meshed at the first groove bending portion 14a and the second groove bending portion 14b and function as a single body.
- the tread rigidity of the center block 16 can be increased. By increasing the tread rigidity of the center block 16, it is possible to suppress the twist of the center block 16, and it is possible to suppress wear of a local region of the center block 16 on both sides of the center lug groove 14 in the tire circumferential direction.
- the tread rigidity of the center block 16 can be increased by providing the first groove bent portions 14 a and 14 b in the center lug groove 14.
- the pair of circumferential main grooves 12 are provided in a region separated from the tire equator line CL in the tread portion 2 by a distance of 30 to 60% of half of the tread width T on both sides in the tire width direction. . That is, all of the pair of circumferential main grooves 12 are included in the region.
- the ratio c / T of the wavy deflection width c (see FIG. 2) of the pair of circumferential main grooves 12 to the tread width T (see FIG. 2) is 0.05 to 0.15.
- the ratio P3 / LB of the groove width P3 (see FIG. 2) of the center lug groove 14 to the maximum length LB (see FIG. 2) in the tire circumferential direction of the center block 16 is 0.03 to 0.07. .
- the tread width T is a peripheral length along the outer shape of the curved tread portion 2 between the tread ends 18 on both sides in the tire width direction.
- the wavy deflection width c of the pair of circumferential main grooves 12 includes the position of the third groove bending portion 11a (the position of the circumferential main groove 12 in the outermost tire width direction in the tire width direction) and the fourth groove bending.
- the distance in the tire width direction between the position of the portion 11b (the position in the innermost tire width direction in the tire width direction of the circumferential main groove 12).
- the maximum length LB in the tire circumferential direction of the center block 16 is the maximum length when the length of the center block 16 in the tire circumferential direction is measured at each position in the tire width direction.
- the groove width P3 of the center lug groove 14 refers to the maximum width of the center lug groove 14. In the present embodiment, the groove width P3 of the center lug groove 14 is constant.
- the adjacent shoulder lug grooves 10 Since the rigidity of the two blocks can be made closer by making the size of the shoulder block defined by the circumferential main groove 12 close to the size of the center block 16, the wear in the tread center region and the tread shoulder region of the tread portion 2 can be made. The speed approaches the same level, and the wear resistance of the tread center region can be improved. Thereby, the partial wear of the tread center area
- the position of the pair of circumferential main grooves 12 is a half of the tread width T from the tire equator line CL to both sides in the tire width direction in order to reduce the difference in the block rigidity between the tread shoulder region and the tread center region. It is preferable that the distance is 35 to 55% of the distance in the separated region.
- the ratio c / T of the deflection width c to the tread width T is 0.05 to 0.15, the difference in block rigidity between the tread center region and the tread shoulder region is reduced. Furthermore, when the top part of the center block 16 formed corresponding to the third groove bending part 11a is a square shape, this corner part can be made an obtuse angle, and when the top part is a curved shape, A large curved shape can be obtained, and local wear around the top can be suppressed. When the ratio c / T is less than 0.05, it approaches the straight main groove extending linearly in the tire circumferential direction, so that the block rigidity around the straight main groove is the center portion of the center block 16 (away from the edge).
- the length of the center block 16 along the tire circumferential direction is set to an appropriate length. be able to. Furthermore, it is possible to suppress both the decrease in block rigidity and the uneven wear of the tread center region with respect to the tread shoulder region, thereby realizing both traction performance and uneven wear resistance.
- each of the pair of circumferential main grooves 12 includes a bottom raised portion 12a in which the groove depth is partially shallow.
- FIG. 5 is a diagram illustrating an example of the raised bottom portion 12a.
- the bottom raised portion 12a is provided in a portion extending between the third groove bent portion 11a and the fourth groove bent portion 11b so as to be inclined with respect to the tire circumferential direction.
- the groove 12 may be provided in the region of the third groove bent portion 11a or the fourth groove bent portion 11b.
- the circumferential main groove 12 has a constant maximum depth region where the groove depth is the deepest, and a portion where the groove depth becomes shallower from this region is the bottom raised portion 12a.
- the deepest groove depth of the circumferential main groove 12 is preferably the same as the shoulder lug groove 10.
- the form of the raised portion 12a may be a form in which the groove depth becomes discontinuously shallow with steps from the maximum depth area, or a form in which the groove depth gradually decreases from the maximum depth area. After the depth becomes shallower, the groove depth may be deepened within a range shallower than the groove depth in the maximum depth region.
- the bottom raised portion 12a may have a constant shallow groove depth, but need not have a constant shallow groove depth, and the groove depth may vary.
- the ratio D2 / T is preferably less than 0.05 regarding the shallowest groove depth D2 (see FIG. 5) in the bottom raised portion 12a and the tread width T in the tire width direction of the tread portion.
- the ratio D2 / T When the ratio D2 / T is 0.05 or more, the groove depth of the bottom raised portion becomes deeper than the tread width T, so that it is difficult to suppress the collapse of the block of the center block 16.
- the ratio D2 / T is more preferably 0.04 or less, for example 0.03.
- the lower limit of the ratio D2 / T is not particularly limited but is, for example, 0.01.
- the groove depth of the bottom raised portion 12a becomes deeper than the tread width T, so that the block rigidity around the bottom raised portion 12a of the center block 16 and the center portion of the center block 16 are increased. The difference between the block rigidity of the inner portion away from the edge of the groove having the raised bottom portion increases, and uneven wear tends to occur.
- the ratio LB / WB of the maximum length LB in the tire circumferential direction of the center block 16 to the maximum width WB in the tire width direction of the center block 16 is 0.6 to 0.8. This is preferable in that the block rigidity in each direction between the tire circumferential direction and the tire width direction as well as the direction and the tire width direction can be made close to constant.
- the ratio LB / WB is more preferably 0.65 to 0.75.
- the top of the center block 16 formed corresponding to the third groove bent portion 11a, which is a portion that bends in the tire width direction outside of the wavy circumferential main groove 12, Both of them are obtuse corners, so that the corners receive braking force, driving force or lateral force to prevent the center block 16 from falling down, and the corners do not become the core of wear generation.
- the groove widths of the pair of circumferential main grooves 12 and the center lug grooves 14 are both 7 to 20 mm so that the edge component of the center block 16 necessary for the traction performance can be obtained. 12 and the center lug groove 14 are preferable in that local wear that easily occurs around the center lug groove 14 can be suppressed.
- the tire 1 is preferably mounted on a construction vehicle or an industrial vehicle.
- Construction vehicles or industrial vehicles include dump trucks, scrapers, graders, excavator loaders, tire rollers, wheel cranes, truck cranes, or vehicles such as COMPACTOR, EARTHMOVER, GREADER, LOADER AND DOZER.
- the circumferential main groove 12 of the tire 1 is provided in a region separated by 30 to 60% of the half of the tread width T on both sides in the tire width direction from the tire equator line CL in the tread portion 2;
- the ratio c / T of the wavy wavy c of the circumferential main groove 12 to the tread width T is 0.05 to 0.15,
- the ratio P3 / LB of the groove width P3 of the center lug groove 14 to the maximum length LB of the center block 16 in the tire circumferential direction is 0.03 to 0.07. For this reason, the center block 16 can be enlarged compared with the past, and traction performance can be improved.
- the wear in the tread center region can be brought close to the wear in the tread shoulder region, and it is possible to prevent the wear from progressing in the tread center region and shortening the life of the tire. Further, local wear of the top portion of the center block 16 protruding outward in the tire width direction can be suppressed.
- the center lug groove 14 includes the first groove bent portion 14 a and the second groove bent portion 14 b. Instead, it is also possible to use the center lug groove 14 that does not include the first groove bending portion 14a and the second groove bending portion 14b and extends linearly with respect to the tire width direction.
- FIG. 6 is a plan development view showing a modification of the tread pattern shown in FIG.
- a circumferential sub-groove 20 is provided in each region of the center block 16.
- the circumferential sub-groove 20 is a groove connecting the center lug grooves adjacent to each other in the tire circumferential direction in the center lug groove 14.
- the circumferential sub-groove 20 is, for example, a tire formed from the positions of the tips of the first groove bent portion 14a and the second groove bent portion 14b of the center lug groove 14 (specifically, a virtual straight line connecting both ends of the center lug groove 14).
- the circumferential direction secondary groove 20 has the 5th groove bending part 21a and the 6th groove bending part 21b.
- the shape of the fifth groove bent portion 21a and the sixth groove bent portion 21b may be a curved shape in addition to the bent shape.
- the curved shape includes a shape in which the corner of the rubber block that is in contact with the corner of the groove with a radius of curvature is rounded, that is, a curved shape of the groove formed by chamfering the corner of the rubber block.
- connection positions of the circumferential sub-groove 20 and the center lug groove 14 are between the first groove bent portion 14a and the second groove bent portion 14b including the first groove bent portion 14a and the second groove bent portion 14b. It is preferable to be in a region in the tire width direction that is sandwiched.
- the circumferential sub-groove 20 includes a straight portion extending in parallel to the tire circumferential direction from the center lug groove 14, two fifth groove bent portions 21a and sixth groove bent portions 21b connected to the straight portions, And an inclined portion inclined in the tire circumferential direction extending between the fifth groove bent portion 21a and the sixth groove bent portion 21b.
- the shapes of the fifth groove bent portion 21 a and the sixth groove bent portion 21 b provided in the circumferential sub-groove 20 are bent, and the fifth groove bent portion 21 a and the sixth groove bent portion.
- the bending angle ⁇ (see FIG. 6) of the circumferential sub-groove 20 formed by 21b is an obtuse angle.
- One of the fifth groove bent portion 21a and the sixth groove bent portion 21b may be bent and the other may be curved.
- the circumferential sub-groove 20 is provided with the fifth groove bent portion 21a and the sixth groove bent portion 21b.
- only one groove bent portion may be provided, or three or more A groove bend may be provided.
- the linear portion in the circumferential sub-groove 20 may not extend in parallel to the tire direction.
- the tire equator line CL passes through a portion connecting the two fifth groove bent portions 21 a and the sixth groove bent portion 21 b in the circumferential sub-groove 20. .
- the linear portion of the circumferential sub-groove 20 has a groove shape extending in parallel with the tire circumferential direction, but the linear portion may be curved instead of the groove shape.
- the fifth groove bent portion 21a and the sixth groove bent portion 21b are formed in a curved shape and the straight portion is formed in a curved shape
- the two curved shapes may be curved shapes having the same curvature radius.
- one of the fifth groove bent portion 21a and the sixth groove bent portion 21b is a bent groove bent portion formed by connecting a linear shape and a curved groove, and the other is a curved groove. It may be a bent part.
- the circumferential sub-groove 20 includes a straight portion, a fifth groove bent portion 21a and a sixth groove bent portion 21b, and an inclined portion. It may be a groove shape extending in the tire circumferential direction while being displaced in the circumferential direction.
- the circumferential sub-groove 20 By providing the circumferential sub-groove 20 in this way, the excessive height of the block rigidity of the center block 16 can be reduced. Thereby, the radius of curvature of the profile shape showing the outer shape of the tread portion 2 at the time of air pressure filling is large in the center region (region with the center block 16), and sharply decreases in the shoulder region (region with the shoulder lug groove 10). An irregular shape can be prevented. Furthermore, the profile shape of the tread portion 2 from the center region to the shoulder region can be a profile shape in which the change in the radius of curvature is moderate. Thereby, the local abrasion which is easy to generate
- the ratio P4 / WB of the groove width P4 (see FIG. 6) of the circumferential sub-groove 20 to the maximum width WB of the center block 16 in the tire width direction is preferably 0.02 or more and 0.07 or less.
- the groove width P4 is a constant groove width
- the maximum groove width of the circumferential sub-groove 20 Say.
- the maximum width WB refers to the total distance from the tire equator line CL of the center block 16 to the farthest position toward both sides in the tire width direction.
- Example, conventional example, comparative example In order to investigate the effect of the tire according to the present embodiment, various tires having different tread patterns were experimentally manufactured, and the wear resistance characteristics and the traction performance in the tread center region were examined.
- the prototype tire is 46 / 90R57. Mounted on rim size 29.00-6.0 (TRA specified rim), 700 kPa (TRA specified air pressure), load load 617.81 kPa (TRA standard load) as test conditions, using a 200 ton dump truck, the same off Traveling on the road surface was performed, and an uneven wear resistance test and a traction test were conducted.
- the uneven wear resistance is a performance representing the amount of wear in the tread center region relative to the amount of wear in the tread shoulder region.
- the ratio of the amount of wear in the tread center region to the amount of wear in the tread shoulder region after running for 5000 hours is determined by measurement.
- the reciprocal of the ratio was expressed as an index so that the higher the index, the better the uneven wear resistance.
- the measurement result represents the brake performance, but can be determined to be the same as the traction performance.
- the measurement result was based on the measurement result of a conventional example described later as a reference (index 100), and the reciprocal of the measurement result was expressed by an index so that the traction property was better as the index was larger.
- FIG. 7 is a diagram showing a tread pattern of a conventional example.
- the tread pattern shown in FIG. 7 includes a shoulder lug groove 110, a pair of circumferential main grooves 112, a center lug groove 114, and a center block 116.
- the shoulder lug groove 110, the pair of circumferential main grooves 112, the center lug groove 114, and the center block 116 are respectively the shoulder lug groove 10, the pair of circumferential main grooves 12, the center lug groove 14, and the center lug groove.
- the configuration is the same as that of the block 16
- the width of the shoulder lug groove 110 and the width of the circumferential main groove 112 are the same as the width of the shoulder lug groove 10.
- the groove width of the circumferential main groove 112 is the same as that of the shoulder lug groove 110, the circumferential main groove is not narrower than the width of the shoulder lug groove 10 as in the circumferential main groove 12. It is assumed that there is no corrugated circumferential main groove.
- the tread pattern shown in FIG. 2 or FIG. 6 was used.
- the center lug groove 14 of the tread pattern shown in FIG. 2 is a straight inclined lug groove having no first groove bent portion 14a and second groove bent portion 14b and inclined in the tire width direction. Except for this, the same specifications as in Examples 1 and 2 were adopted. Tables 1 to 5 below show each element of the tread pattern and the evaluation results of uneven wear resistance and traction at that time.
- the “position of the circumferential main groove” is the distance between the position of the circumferential main groove closest to the tire equator line CL and the tire equator line CL, the farthest from the tire equator line CL.
- the distance between the position of the circumferential main groove and the tire equator line CL is shown in% as a value obtained by dividing the distance by half of the tread width T.
- Tables 4A and 4B show tread patterns in which the position of the circumferential main groove, the ratio c / T, and the ratio P3 / LB are determined to be included in the range of the present embodiment, and the ratio P4 / WB is variously changed (Example 13).
- the evaluation results of ⁇ 17) are shown.
- Table 4 the position of the circumferential main groove, the ratio c / T, and the ratio P3 / LB are determined to be included in the range of the present embodiment, and the tread pattern in which the ratio LB / WB is variously changed (Example 18).
- the evaluation results of ⁇ 22) are shown.
- Table 5 shows the evaluation results of the examples in which the first groove bent portion 14a and the second groove bent portion 14b are not provided in the center lug groove 14 with respect to Examples 1 and 2 of Table 1 (Examples 23 and 24). ).
- the circumferential main groove 12 is located within 30 to 60% of the half of the tread width T from the tire equator line CL.
- the ratio c / T is 0.05 to 0.15
- the ratio P3 / LB is 0.03 to 0.07, thereby improving uneven wear resistance and traction. I understand that I can do it. From Table 3, it can be seen that the ratio D2 / T is preferably 0.05 or less, preferably less than 0.05, and more preferably 0.03 or less from the viewpoint of improving uneven wear resistance.
- the center lug groove 14 in the tread pattern has the effect of the present embodiment even if the first groove bent part 14a and the second groove bent part 14b are not provided. 24, and the evaluation results of Examples 1 and 2 in Table 1, the center lug groove 14 in the tread pattern may be provided with the first groove bent portion 14a and the second groove bent portion 14b. It can be seen that it is preferable in terms of improving uneven wear resistance. As mentioned above, the effect of this embodiment is clear.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Abstract
Description
(1)該周方向溝は、トレッド幅の50%に相当するトレッド中央領域内で周方向に延び、
(2)該周方向溝の溝深さがトレッド幅の5%以上で、
(3)該横方向溝の内、少なくともトレッド両側部に具えられた横方向溝の溝深さが該周方向溝の溝深さの109%以上である。
これにより、悪路走行時のトラクション性と高速走行時のウエット性能を両立させて向上させることができる、とされている。
特に、バスやトラック等に装着される空気入りタイヤ、あるいは、鉱山等のオフロード上を走行するダンプトラックに装着される、例えば49インチ以上の大型タイヤにおいて、トラクション性能を向上しつつ、トレッドセンター領域の耐摩耗性を向上することが、タイヤを効果的に使用する点から好ましい。
前記トレッドパターンは、
タイヤ周方向に間隔をあけて複数設けられ、タイヤ赤道線を横切るようにタイヤ赤道線を基準としたタイヤ幅方向の第1の側及び第2の側の半トレッド領域のそれぞれに延びて両端を有するセンターラグ溝と、
タイヤ周方向に間隔をあけて複数設けられ、前記半トレッド領域のそれぞれにおいて、タイヤ幅方向外側に延びて、タイヤ幅方向外側の端がタイヤ幅方向の両側にある接地端に開口するショルダーラグ溝であって、タイヤ周方向において、前記センターラグ溝のうちタイヤ周方向に隣りあう隣接センターラグ溝の端の間に1つずつ設けられたショルダーラグ溝と、
前記半トレッド領域のそれぞれにおいて、前記センターラグ溝の端と、前記ショルダーラグ溝のタイヤ幅方向の内側の端を交互に接続するようにタイヤ周上全周にわたって波形状に形成され、前記ショルダーラグ溝より溝幅が狭く、前記半トレッド領域に設けられた一対の周方向主溝と、
前記センターラグ溝と前記一対の周方向主溝によって画されてタイヤ周方向に一列に複数形成されたセンターブロックと、を備える。
前記周方向主溝は、前記トレッド部におけるタイヤ赤道線からタイヤ幅方向の両側に、トレッド幅Tの半分の30~60%の距離、離間した領域内に設けられ、
前記一対の周方向主溝の波形状の振れ幅cの、トレッド幅Tに対する比c/Tは、0.05~0.15であり、
前記センターラグ溝の溝幅P3の、前記センターブロックのタイヤ周方向の最大長さLBに対する比P3/LBは、0.03~0.07である。
前記センターラグ溝が前記周方向主溝と接続する前記第1の側の第1接続端部及び前記第2の側の第2接続端部は、前記周方向主溝のタイヤ幅方向の内側の先端と接続し、前記センターラグ溝の前記第2接続端部は、前記第1接続端部よりもタイヤ周方向の第3の側にあり、
前記センターラグ溝の溝幅方向の中心位置に関し、前記第1接続端部と前記第1溝曲がり部がタイヤ周方向の前記第3の側に突出する突出端とを結ぶ第1直線のタイヤ幅方向に対する傾斜角度、および、前記第2接続端部と前記第2溝曲がり部がタイヤ周方向の前記第4の側に突出する突出端とを結ぶ第2直線のタイヤ幅方向に対する傾斜角度は、前記センターラグ溝の前記第1接続端部と前記第2接続端部を結ぶ第3直線のタイヤ幅方向に対する傾斜角度よりも大きい、ことが好ましい。
前記底上げ部における最も浅い溝深さD2及び前記トレッド部のタイヤ幅方向のトレッド幅Tに関して、比D2/Tは、0.05未満である、ことが好ましい。
前記周方向副溝は、屈曲形状あるいは湾曲形状の溝曲がり部を有する、ことが好ましい。
前記周方向副溝と前記センターラグ溝それぞれの接続位置は、前記第1溝曲がり部と前記第2溝曲がり部を含む、前記第1溝曲がり部と前記第2溝曲がり部の間に挟まれたタイヤ幅方向の領域内にある、ことが好ましい。
前記第1溝曲がり部に対応して形成される前記センターブロックの頂部は、いずれも鈍角の角部である、ことが好ましい。
本明細書においてタイヤ幅方向とは、空気入りタイヤの回転中心軸方向をいい、タイヤ周方向とは、タイヤ回転中心軸を中心にタイヤを回転させたときにできるトレッド表面の回転面の回転方向をいう。タイヤ径方向とは、タイヤ回転中心軸から放射状に向く方向をいう。タイヤ径方向外側とは、タイヤ回転中心軸から遠ざかる側をいい、タイヤ径方向内側とは、タイヤ回転中心軸に近づく側をいう。また、タイヤ幅方向外側とは、タイヤ赤道線からタイヤ幅方向において遠ざかる側をいい、タイヤ幅方向内側とは、タイヤ幅方向においてタイヤ赤道線に近づく側をいう。
また、本明細書でいう重荷重用空気入りタイヤとは、JATMA(日本自動車タイヤ協会規格) YEAR BOOK 2014のC章に記載されるタイヤの他に、D章に記載される1種(ダンプトラック、スクレーバ)用タイヤ、2種(グレーダ)用タイヤ、3種(ショベルローダ等)用タイヤ、4種(タイヤローラ)用タイヤ、モビールクレーン(トラッククレーン、ホイールクレーン)用タイヤ、あるいはTRA 2013 YEAR BOOKのSECTION 4 あるいは、section 6に記載される車両用タイヤをいう。
図1に示すタイヤ1は、トレッド部2、サイドウォール部3、ビード部4を有する。ビード部4は、タイヤ幅方向の両側に、一対のビードコア4aを有する。一対のビードコア4aの間には、カーカス層5が装架されている。カーカス層5の両端部は、ビードコア4aの廻りにタイヤ内側から外側に折り返されている。カーカス層5は、一枚のカーカスプライで構成されてもよいし、複数枚のカーカスプライで構成されてもよい。
図2は、タイヤ1のトレッド部2に設けられたトレッドパターンを平面展開したパターン図である。図2中、タイヤ周方向はCで、タイヤ幅方向はWで方向を示している。
トレッド部2は、ショルダーラグ溝10と、一対の周方向主溝12と、センターラグ溝14と、センターブロック16と、をトレッドパターンとして備える。
タイヤ幅方向の両側に位置するショルダーラグ溝10において、一方の半トレッド領域における1つのショルダーラグ溝10のタイヤ周方向の位置は、他方の半トレッド領域にある隣接する2つのショルダーラグ溝のタイヤ周方向の位置の間にある。
さらに、ショルダーラグ溝10は、半トレッド領域のそれぞれにおいて、ショルダーラグ溝10が有するタイヤ幅方向内側の端のタイヤ幅方向の位置が、後述するセンターラグ溝14の端のタイヤ幅方向の位置に比べてタイヤ幅方向外側にあり、かつ、ショルダーラグ溝10は、タイヤ周方向において、センターラグ溝14のうちタイヤ周方向に隣りあう隣接センターラグ溝14の間のショルダー領域に1つずつ設けられている。これにより、後述する周方向主溝12は、センターラグ溝14の端とショルダーラグ溝10のタイヤ幅方向内側の端を交互に接続して波形状を成す。
具体的には、周方向主溝12は、タイヤ幅方向の外側及び内側に凸状を成して曲がる溝曲がり部11(第3溝曲がり部11a及び第4溝曲がり部11b)をタイヤ周上に複数有し、タイヤ幅方向に波形状に蛇行しながらタイヤ周方向に延びる。一対の周方向主溝12それぞれは、溝曲がり部11のうちタイヤ幅方向外側に凸状を成して曲がる第3溝曲がり部11aでショルダーラグ溝10と接続する。また、一対の周方向主溝12それぞれは、溝曲がり部11のうちタイヤ幅方向内側に凸状を成して曲がる第4溝曲がり部11bでセンターラグ溝14と接続する。第4溝曲がり部11bのタイヤ周方向の位置は、反対側の半トレッド領域の第4溝曲がり部11bに対して位置ずれしている。したがって、センターラグ溝14は、タイヤ幅方向に対して傾斜した方向に延びている。さらに、一対の周方向主溝12の溝幅は、ショルダーラグ溝10の溝幅よりも狭い。
第1溝曲がり部14aは、タイヤ幅方向のうち、タイヤ赤道線CLに対して図2に示す紙面左側(第1の側)においてタイヤ周方向の図2,3の紙面上側(第3の側)に突出するように屈曲又は湾曲する部分で、第2溝曲がり部14bは、図2に示す紙面右側(第2の側)においてタイヤ周方向の図3の紙面下側(第4の側)に突出するように屈曲又は湾曲する部分である。
なお、本実施形態では、第1溝曲がり部14a、第2溝曲がり部14bは屈曲形状であるが、湾曲形状であってもよい。湾曲形状には、曲率半径を定めて溝の角形状の部分に接するゴムブロックの角部を丸くした形状、すなわち、ゴムブロックの角部を面取りしてつくられる溝の湾曲形状も含まれる。
センターラグ溝14は、第1溝曲がり部14a及び第2溝曲がり部14bを有することで、タイヤ周方向に波状に変位する。第1溝曲がり部14a及び第2溝曲がり部14bの形状は、例えばこの第1溝曲がり部14a、第2溝曲がり部14bによりつくられるセンターラグ溝14の曲がる角度θ(図3参照)が鈍角になる形状であることが好ましい。第1溝曲がり部14a及び第2溝曲がり部14bは、タイヤ赤道線CLのタイヤ幅方向両側に、タイヤ赤道線CLから同じ距離離間した位置に設けられることが好ましい。センターラグ溝14のうち、第1溝曲がり部14aと第2溝曲がり部14bとの間の部分にタイヤ赤道線CLが通過するように設けられ、また、この部分において、タイヤ幅方向に対するセンターラグ溝14の傾斜の向きがこれ以外の部分と異なっていることが好ましい。
センターラグ溝14の第2溝曲がり部14bは、タイヤ赤道線CLを基準として第2の側(図4中の紙面右側)においてタイヤ周方向の第4の側(図3中の紙面下方向の側)に突出するように屈曲又は湾曲する。第4の側は、第3の側に対して反対側である。ここで、センターラグ溝14が周方向主溝12と接続する第1の側の第1接続端部14c及びセンターラグ溝14が周方向主溝12と接続する第2の側の第2接続端部14dは、周方向周溝11のタイヤ幅方向の内側の先端、すなわち第2溝曲がり部11b,11bに該当する。センターラグ溝14がタイヤ幅方向に対して傾斜しているため、センターラグ溝14の第2接続端部14dは、第1接続端部14cよりもタイヤ周方向の第3の側(図3中の紙面上方向の側)にある。
このとき、センターラグ溝14の溝幅方向の中心位置に関し、第1溝曲がり部14aがタイヤ周方向の第3の側(図3中の上方向の側)に突出する突出端と第1接続端部14cとを結ぶ第1直線14eのタイヤ幅方向に対する傾斜角度(0度より大きく90度より小さい傾斜角度)、および、第2溝曲がり部14bがタイヤ周方向の第4の側に突出する突出端と第2接続端部14dとを結ぶ第2直線14fのタイヤ幅方向に対する傾斜角度(0度より大きく90度より小さい傾斜角度)は、センターラグ溝14の第1接続端部14cと第2接続端部14dを結ぶ第3直線14gのタイヤ幅方向に対する傾斜角度(0度より大きく90度より小さい傾斜角度)よりも大きいことが好ましい。
このとき、底上げ部12aにおける最も浅い溝深さD2(図5参照)及びトレッド部のタイヤ幅方向のトレッド幅Tに関して、比D2/Tは、0.05未満であることが好ましい。比D2/Tが0.05以上である場合、底上げ部の溝深さがトレッド幅T対比深くなるので、センターブロック16のブロックの倒れこみを抑えることは難しくなる。比D2/Tはより好ましくは0.04以下であり、例えば0.03である。比D2/Tの下限は特に制限はないが、例えば0.01である。
また、比D2/Tが0.05以上である場合、底上げ部12aの溝深さがトレッド幅T対比深くなるので、センターブロック16の底上げ部12a周りのブロック剛性と、センターブロック16の中央部(底上げ部を有する溝のエッジから離れた内側部分)のブロック剛性との間の差が大きくなり、偏摩耗が発生しやすくなる。
また、一対の周方向主溝12及びセンターラグ溝14の溝幅は、いずれも7~20mmであることが、トラクション性能に必要なセンターブロック16のエッジ成分を持つことができ、周方向主溝12及びセンターラグ溝14の周りで発生しやすい局部的な摩耗を抑制できる点から好ましい。
なお、タイヤ1は、建設用車両または産業用車両に装着されることが好ましい。建設用車両または産業用車両は、ダンプトラック、スクレーバ、グレーダ、ショベルローダ、タイヤローラ、ホイールクレーン、トラッククレーン、あるいは、COMPACTOR、 EARTHMOVER、GREADER、LOADER AND DOZER等の車両を含む。
・タイヤ1の周方向主溝12は、トレッド部2におけるタイヤ赤道線CLからタイヤ幅方向の両側に、トレッド幅Tの半分の30~60%の距離、離間した領域内に設けられ、
・周方向主溝12の波形状の振れ幅cの、トレッド幅Tに対する比c/Tは、0.05~0.15であり、
・ センターラグ溝14の溝幅P3の、センターブロック16のタイヤ周方向の最大長さLBに対する比P3/LBは、0.03~0.07である。
このため、センターブロック16を従来に比べて大きくすることができ、トラクション性能を向上させることができる。さらに、トレッドセンター領域の摩耗を、トレッドショルダー領域の摩耗に近づけることができ、トレッドセンター領域において得に摩耗が進展してタイヤの寿命が短くなることを防止できる。また、センターブロック16のタイヤ幅方向外側に突出した頂部の局部的な摩耗を抑制することができる。
本実施形態のトレッドパターンとして、図2に示すように、第1溝曲がり部14a及び第2溝曲がり部14bをセンターラグ溝14が備える好ましい形態を用いて説明したが、このセンターラグ溝14の代わりに、第1溝曲がり部14a及び第2溝曲がり部14bを備えず、タイヤ幅方向に対して直線状に傾斜して延びるセンターラグ溝14を用いることもできる。
図6は、図2に示すトレッドパターンの変形例を示す平面展開図である。図6に示されるように、センターブロック16それぞれの領域には、周方向副溝20が設けられことが好ましい。周方向副溝20は、センターラグ溝14のうち、タイヤ周方向に隣り合うセンターラグ溝間を接続する溝である。周方向副溝20は、例えば、センターラグ溝14の第1溝曲がり部14a及び第2溝曲がり部14bの先端の位置(具体的には、センターラグ溝14の両端を結んだ仮想直線からタイヤ周方向に最も突出した位置)で、センターラグ溝14に接続されていることが好ましい。また、周方向副溝20は、第5溝曲がり部21a及び第6溝曲がり部21bを有することが好ましい。第5溝曲がり部21a及び第6溝曲がり部21bの形状は、屈曲形状のほかに、湾曲形状であってもよい。湾曲形状には、曲率半径を定めて溝の角部に接するゴムブロックの角部を丸くした形状、すなわち、ゴムブロックの角部を面取りしてつくられる溝の湾曲形状も含まれる。
また、周方向副溝20とセンターラグ溝14それぞれの接続位置は、第1溝曲がり部14aと第2溝曲がり部14bを含む、第1溝曲がり部14aと第2溝曲がり部14bの間に挟まれたタイヤ幅方向の領域内にあることが好ましい。
第5溝曲がり部21a及び第6溝曲がり部21bの一方を、屈曲形状、他方を湾曲形状としてもよい。
本実施形態では、周方向副溝20に、第5溝曲がり部21a及び第6溝曲がり部21bが設けられているが、1つの溝曲がり部のみが設けられてもよいし、3つ以上の溝曲がり部が設けられてもよい。この場合、周方向副溝20における上記直線部は、タイヤ方向に平行に延びなくてもよい。また、図6に示すように、周方向副溝20のうち、2つの第5溝曲がり部21aと第6溝曲がり部21bとの間を結ぶ部分において、タイヤ赤道線CLが通過することが好ましい。
また、センターブロック16のタイヤ幅方向における最大幅WBに対する、周方向副溝20の溝幅P4(図6参照)の比P4/WBは、0.02以上0.07以下であることが好ましい。ここで、周方向副溝20が一定の溝幅を有する場合、溝幅P4は一定の溝幅であり、周方向副溝20の溝幅が変化する場合、周方向副溝20の最大溝幅をいう。また、最大幅WBは、センターブロック16のタイヤ赤道線CLからタイヤ幅方向の両側に向かって最も離れた位置までの距離の合計をいう。比P4/WBを0.02~0.07とすることにより、センターブロック16のブロック剛性を所定の範囲にすることができる。
本実施形態のタイヤの効果を調べるために、トレッドパターンの異なるタイヤを種々試作し、トレッドセンター領域の耐摩耗特性と、トラクション性能とを調べた。試作したタイヤは、46/90R57である。リムサイズ29.00-6.0(TRA規定リム)に装着し、700kPa(TRA規定空気圧)、負荷荷重617.81kN(TRA規格荷重)を試験条件として、200トン用ダンプトラックを用いて、同じオフロード路面の走行を行ない耐偏摩耗性試験及びトラクション試験を行なった。耐偏耗性は、トレッドショルダー領域の摩耗量に対するトレッドセンター領域の摩耗量の大小を表す性能である。
耐偏摩耗性については、5000時間走行後の、トレッドショルダー領域の摩耗量に対するトレッドセンター領域の摩耗量の比を測定により求め、後述する従来例のトレッドショルダー領域の摩耗量に対するトレッドセンター領域の摩耗量の比を基準(指数100)とし、指数が大きい程、耐偏摩耗性が優れるように、上記比の逆数を指数で表した。
トラクション試験では、新品時のタイヤで、40km/時の速度から車両が停止するまでの距離を測定した。上記測定結果はブレーキ性能を表すが、トラクション性能と同一と判断することができる。測定結果を、後述する従来例の測定結果を基準(指数100)とし、指数が大きい程トラクション性が優れるように、測定結果の逆数を指数で表した。
図7は、従来例のトレッドパターンを示す図である。図7に示すトレッドパターンは、ショルダーラグ溝110と、一対の周方向主溝112と、センターラグ溝114と、センターブロック116と、を備える。ショルダーラグ溝110と、一対の周方向主溝112と、センターラグ溝114と、センターブロック116は、それぞれ、ショルダーラグ溝10と、一対の周方向主溝12と、センターラグ溝14と、センターブロック16と同様な構成を有するが、ショルダーラグ溝110の溝幅と周方向主溝112の溝幅は、ショルダーラグ溝10の溝幅と同じである。周方向主溝112の溝幅がショルダーラグ溝110と同じであることから、周方向主溝12のように、ショルダーラグ溝10の溝幅より狭い周方向主溝ではないので、下記表1では、波形状の周方向主溝は無い、としている。
実施例1~22及び比較例1~7は、図2または図6に示すトレッドパターンを用いた。
実施例23、24は、図2に示すトレッドパターンのセンターラグ溝14を、第1溝曲がり部14a及び第2溝曲がり部14bがなく、タイヤ幅方向に傾斜した直線形状の傾斜ラグ溝とした以外、実施例1,2と同じ仕様とした。
下記表1~5については、トレッドパターンの各要素とそのときの耐偏摩耗性とトラクション性の評価結果を示す。
以降、表1~5では「周方向主溝の位置」を、タイヤ赤道線CLに最も近い周方向主溝の位置とタイヤ赤道線CLとの間の距離、タイヤ赤道線CLから最も遠く離れた周方向主溝の位置とタイヤ赤道線CLとの間の距離を、トレッド幅Tの半分で割った値の%表示で示している。
表2A,2Bは、表1中の実施例2に合わせて、周方向主溝の位置及びP3/LBを固定(周方向主溝の位置=35~55%,P3/LB=0.06)して、比c/Tを種々変更したトレッドパターン(実施例2、実施例4、5、比較例4,5)の評価結果を示す。さらに、表2A,2Bでは、周方向主溝の位置及び比c/Tを固定(位置=35~55%,比c/T=0.01)して、比P3/LBを種々変更したトレッドパターン(実施例6~8、比較例6,7)の評価結果を示す。
表3では、周方向主溝の位置、比c/T、及び比P3/LBが本実施形態の範囲に含まれるように定め、比D2/Tを種々変更したトレッドパターン(実施例9~12)の評価結果を示す。
表4A,4Bは、周方向主溝の位置、比c/T、及び比P3/LBが本実施形態の範囲に含まれるように定め、比P4/WBを種々変更したトレッドパターン(実施例13~17)の評価結果を示す。さらに、表4では、周方向主溝の位置、比c/T、及び比P3/LBが本実施形態の範囲に含まれるように定め、比LB/WBを種々変更したトレッドパターン(実施例18~22)の評価結果を示す。
表5は、表1の実施例1,2に対して、センターラグ溝14に第1溝曲がり部14a及び第2溝曲がり部14bが設けられない例の評価結果を示す(実施例23,24)。
表3より、比D2/Tは、0.05以下、好ましくは0.05未満、より好ましくは0.03以下であることが、耐偏摩耗性の向上の点で好ましいことがわかる。
表4A,4Bより、第5、第6溝曲がり部21a,21bを備える周方向副溝20を設けること、また、比LB/WBを0.6~0.8であることが、耐偏摩耗性の向上の点で好ましいことがわかる。
表5の実施例23,24より、トレッドパターンにおけるセンターラグ溝14には、第1溝曲がり部14a及び第2溝曲がり部14bを設けなくても本実施形態の効果は生じるが、実施例23,24の評価結果と、表1の実施例1,2の評価結果との比較より、トレッドパターンにおけるセンターラグ溝14には、第1溝曲がり部14a及び第2溝曲がり部14bを設けることが、耐偏摩耗性の向上の点で好ましいことがわかる。
以上より、本実施形態の効果は明らかである。
2 トレッド部
3 サイドウォール部
4 ビード部
4a ビードコア
5 カーカス層
6 ベルト層
6a 第1の交差ベルト層
6b 第2の交差ベルト層
6c 第3の交差ベルト層
10,110 ショルダーラグ溝
11 溝曲がり部
11a 第3溝曲がり部
11b 第4溝曲がり部
12,112 周方向主溝
12a 底上げ部
14,114 センターラグ溝
14a 第1溝曲がり部
14b 第2溝曲がり部
16,116 センターブロック
18 トレッド端
20 周方向副溝
21a 第5溝曲がり部
21b 第6溝曲がり部
Claims (12)
- トレッドパターン付き空気入りタイヤであって、
前記トレッドパターンは、
タイヤ周方向に間隔をあけて複数設けられ、タイヤ赤道線を横切るようにタイヤ赤道線を基準としたタイヤ幅方向の第1の側及び第2の側の半トレッド領域のそれぞれに延びて両端を有するセンターラグ溝と、
タイヤ周方向に間隔をあけて複数設けられ、前記半トレッド領域のそれぞれにおいて、タイヤ幅方向外側に延びて、タイヤ幅方向外側の端がタイヤ幅方向の両側にある接地端に開口するショルダーラグ溝であって、タイヤ周方向において、前記センターラグ溝のうちタイヤ周方向に隣りあう隣接センターラグ溝の端の間に1つずつ設けられたショルダーラグ溝と、
前記半トレッド領域のそれぞれにおいて、前記センターラグ溝の端と、前記ショルダーラグ溝のタイヤ幅方向の内側の端を交互に接続するようにタイヤ周上全周にわたって波形状に形成され、前記ショルダーラグ溝より溝幅が狭く、前記半トレッド領域に設けられた一対の周方向主溝と、
前記センターラグ溝と前記一対の周方向主溝によって画されてタイヤ周方向に一列に複数形成されたセンターブロックと、を備え、
前記周方向主溝は、前記トレッド部におけるタイヤ赤道線からタイヤ幅方向の両側に、トレッド幅Tの半分の30~60%の距離、離間した領域内に設けられ、
前記一対の周方向主溝の波形状の振れ幅cの、トレッド幅Tに対する比c/Tは、0.05~0.15であり、
前記センターラグ溝の溝幅P3の、前記センターブロックのタイヤ周方向の最大長さLBに対する比P3/LBは、0.03~0.07である、ことを特徴とする重荷重用空気入りタイヤ。 - 前記センターラグ溝のそれぞれは、前記第1の側においてタイヤ周方向の第3の側に突出するように屈曲又は湾曲する第1溝曲がり部と、前記第2の側においてタイヤ周方向の前記第3の側の反対側である第4の側に突出するように屈曲又は湾曲する第2溝曲がり部と、を備え、
前記センターラグ溝が前記周方向主溝と接続する前記第1の側の第1接続端部及び前記第2の側の第2接続端部は、前記周方向主溝のタイヤ幅方向の内側の先端と接続し、前記センターラグ溝の前記第2接続端部は、前記第1接続端部よりもタイヤ周方向の第3の側にあり、
前記センターラグ溝の溝幅方向の中心位置に関し、前記第1接続端部と前記第1溝曲がり部がタイヤ周方向の前記第3の側に突出する突出端とを結ぶ第1直線のタイヤ幅方向に対する傾斜角度、および、前記第2接続端部と前記第2溝曲がり部がタイヤ周方向の前記第4の側に突出する突出端とを結ぶ第2直線のタイヤ幅方向に対する傾斜角度は、前記センターラグ溝の前記第1接続端部と前記第2接続端部を結ぶ第3直線のタイヤ幅方向に対する傾斜角度よりも大きい、請求項1に記載の重荷重用空気入りタイヤ。 - 前記センターラグ溝の溝幅方向の中心位置に関し、前記第1溝曲がり部がタイヤ周方向の前記第3の側に突出する突出端と前記第1接続端部との間の前記センターラグ溝の部分は、前記第1直線上、あるいは前記第1直線に対して前記第3の側にあり、前記第2溝曲がり部がタイヤ周方向の前記第4の側に突出する突出端と前記第2接続端部との間の前記センターラグ溝の部分は、前記第2直線上、あるいは前記第2直線に対して前記第4の側にある、請求項2に記載の重荷重用空気入りタイヤ。
- 前記一対の周方向主溝それぞれにおいて、溝深さが部分的に浅くなった底上げ部を備える、請求項1~3のいずれか1項に記載の重荷重用空気入りタイヤ。
- 前記底上げ部における最も浅い溝深さD2及び前記トレッド部のタイヤ幅方向のトレッド幅Tに関して、比D2/Tは、0.05未満である、請求項4に記載の重荷重用空気入りタイヤ。
- 前記センターブロックそれぞれの領域には、前記センターラグ溝のうち、タイヤ周方向に隣り合うセンターラグ溝間を接続する、周方向副溝が設けられ、
前記周方向副溝は、屈曲形状あるいは湾曲形状の溝曲がり部を有する、請求項1~5のいずれか1項に記載の重荷重用空気入りタイヤ。 - 前記センターブロックそれぞれの領域には、前記センターラグ溝のうち、タイヤ周方向に隣り合うセンターラグ溝間を接続する、周方向副溝が設けられ、
前記周方向副溝と前記センターラグ溝それぞれの接続位置は、前記第1溝曲がり部と前記第2溝曲がり部を含む、前記第1溝曲がり部と前記第2溝曲がり部の間に挟まれたタイヤ幅方向の領域内にある、請求項1~5のいずれか1項に記載の重荷重用空気入りタイヤ。 - 前記センターブロックのタイヤ幅方向における最大幅WBに対する、前記周方向副溝の溝幅P4の比P4/WBは、0.02~0.07である、請求項6または7に記載の重荷重用空気入りタイヤ。
- 前記センターブロックのタイヤ幅方向における最大幅WBに対する、前記センターブロックのタイヤ周方向の最大長さLBの比LB/WBは、0.6~0.8である、請求項1~8のいずれか1項に記載の重荷重用空気入りタイヤ。
- 前記一対の周方向主溝には、波形状を成すように、タイヤ幅方向外側に屈曲あるいは湾曲した第1溝曲がり部と、タイヤ幅方向内側に屈曲あるいは湾曲した第2溝曲がり部と、が配置され、
前記第1溝曲がり部に対応して形成される前記センターブロックの頂部は、いずれも鈍角の角部である、請求項1~9のいずれか1項に記載の重荷重用空気入りタイヤ。 - 前記一対の周方向主溝及び前記センターラグ溝の溝幅は、いずれも7~20mmである、請求項1~10のいずれか1項に記載の重荷重用空気入りタイヤ。
- 建設用車両または産業用車両に装着される、請求項1~11のいずれか1項に記載の重荷重用空気入りタイヤ。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2015293161A AU2015293161B2 (en) | 2014-07-23 | 2015-07-23 | Pneumatic tire for heavy loads |
CN201580038827.4A CN106536226B (zh) | 2014-07-23 | 2015-07-23 | 重载荷用充气轮胎 |
US15/328,397 US10308079B2 (en) | 2014-07-23 | 2015-07-23 | Pneumatic tire for heavy loads |
JP2015536687A JP6229723B2 (ja) | 2014-07-23 | 2015-07-23 | 重荷重用空気入りタイヤ |
RU2017105481A RU2633030C1 (ru) | 2014-07-23 | 2015-07-23 | Пневматическая шина для высоконагруженных машин |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014149822 | 2014-07-23 | ||
JP2014-149822 | 2014-07-23 | ||
PCT/JP2015/063719 WO2016013276A1 (ja) | 2014-07-23 | 2015-05-13 | 重荷重用空気入りタイヤ |
JPPCT/JP2015/063719 | 2015-05-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2016013601A1 true WO2016013601A1 (ja) | 2016-01-28 |
Family
ID=55163125
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2015/070931 WO2016013601A1 (ja) | 2014-07-23 | 2015-07-23 | 重荷重用空気入りタイヤ |
Country Status (6)
Country | Link |
---|---|
US (1) | US10308079B2 (ja) |
JP (1) | JP6229723B2 (ja) |
CN (1) | CN106536226B (ja) |
AU (1) | AU2015293161B2 (ja) |
RU (1) | RU2633030C1 (ja) |
WO (1) | WO2016013601A1 (ja) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110799357B (zh) * | 2017-06-22 | 2022-01-14 | 株式会社普利司通 | 重载用轮胎 |
JP6624231B2 (ja) * | 2018-04-17 | 2019-12-25 | 横浜ゴム株式会社 | 空気入りタイヤ |
JP7181073B2 (ja) * | 2018-12-14 | 2022-11-30 | Toyo Tire株式会社 | 空気入りタイヤ |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004098914A (ja) * | 2002-09-11 | 2004-04-02 | Bridgestone Corp | 重荷重用タイヤ |
JP2004224131A (ja) * | 2003-01-21 | 2004-08-12 | Sumitomo Rubber Ind Ltd | 重荷重用ラジアルタイヤ |
WO2006001202A1 (ja) * | 2004-06-23 | 2006-01-05 | Bridgestone Corporation | 空気入りタイヤ |
JP2006151083A (ja) * | 2004-11-26 | 2006-06-15 | Bridgestone Corp | 重荷重車両用タイヤ |
JP2007191093A (ja) * | 2006-01-20 | 2007-08-02 | Bridgestone Corp | 建設車両用タイヤ |
JP2008279976A (ja) * | 2007-05-14 | 2008-11-20 | Bridgestone Corp | 建設車両用重荷重空気入りラジアルタイヤ |
JP2010125999A (ja) * | 2008-11-27 | 2010-06-10 | Bridgestone Corp | タイヤ |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3569056B2 (ja) | 1995-11-15 | 2004-09-22 | 株式会社ブリヂストン | 空気入りタイヤ |
JP2001315507A (ja) * | 2000-05-01 | 2001-11-13 | Ohtsu Tire & Rubber Co Ltd :The | 空気入りタイヤ |
USD457128S1 (en) * | 2001-02-20 | 2002-05-14 | The Goodyear Tire & Rubber Company | Tire tread |
ES2355158T3 (es) * | 2005-08-08 | 2011-03-23 | Bridgestone Corporation | Neumático para vehículo de construcción. |
JP2008114738A (ja) * | 2006-11-06 | 2008-05-22 | Bridgestone Corp | 重荷重用タイヤおよびその使用方法 |
-
2015
- 2015-07-23 JP JP2015536687A patent/JP6229723B2/ja active Active
- 2015-07-23 WO PCT/JP2015/070931 patent/WO2016013601A1/ja active Application Filing
- 2015-07-23 AU AU2015293161A patent/AU2015293161B2/en active Active
- 2015-07-23 RU RU2017105481A patent/RU2633030C1/ru active
- 2015-07-23 CN CN201580038827.4A patent/CN106536226B/zh active Active
- 2015-07-23 US US15/328,397 patent/US10308079B2/en active Active
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004098914A (ja) * | 2002-09-11 | 2004-04-02 | Bridgestone Corp | 重荷重用タイヤ |
JP2004224131A (ja) * | 2003-01-21 | 2004-08-12 | Sumitomo Rubber Ind Ltd | 重荷重用ラジアルタイヤ |
WO2006001202A1 (ja) * | 2004-06-23 | 2006-01-05 | Bridgestone Corporation | 空気入りタイヤ |
JP2006151083A (ja) * | 2004-11-26 | 2006-06-15 | Bridgestone Corp | 重荷重車両用タイヤ |
JP2007191093A (ja) * | 2006-01-20 | 2007-08-02 | Bridgestone Corp | 建設車両用タイヤ |
JP2008279976A (ja) * | 2007-05-14 | 2008-11-20 | Bridgestone Corp | 建設車両用重荷重空気入りラジアルタイヤ |
JP2010125999A (ja) * | 2008-11-27 | 2010-06-10 | Bridgestone Corp | タイヤ |
Also Published As
Publication number | Publication date |
---|---|
US10308079B2 (en) | 2019-06-04 |
JPWO2016013601A1 (ja) | 2017-04-27 |
RU2633030C1 (ru) | 2017-10-11 |
JP6229723B2 (ja) | 2017-11-15 |
CN106536226B (zh) | 2018-09-28 |
AU2015293161A1 (en) | 2017-03-02 |
CN106536226A (zh) | 2017-03-22 |
US20170210178A1 (en) | 2017-07-27 |
AU2015293161A9 (en) | 2017-04-20 |
AU2015293161B2 (en) | 2017-08-03 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6229727B2 (ja) | 重荷重用空気入りタイヤ | |
JP6229735B2 (ja) | 重荷重用空気入りタイヤ | |
WO2016013604A1 (ja) | 重荷重用空気入りタイヤ | |
JP6229722B2 (ja) | 重荷重用空気入りタイヤ | |
JP6229723B2 (ja) | 重荷重用空気入りタイヤ | |
JP6432518B2 (ja) | 空気入りタイヤ | |
JP6229724B2 (ja) | 重荷重用空気入りタイヤ | |
JP6229734B2 (ja) | 空気入りタイヤ | |
JP5910795B1 (ja) | 重荷重用空気入りタイヤ | |
JP6229725B2 (ja) | 重荷重用空気入りタイヤ |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ENP | Entry into the national phase |
Ref document number: 2015536687 Country of ref document: JP Kind code of ref document: A |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 15824753 Country of ref document: EP Kind code of ref document: A1 |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 15328397 Country of ref document: US |
|
ENP | Entry into the national phase |
Ref document number: 2017105481 Country of ref document: RU Kind code of ref document: A |
|
ENP | Entry into the national phase |
Ref document number: 2015293161 Country of ref document: AU Date of ref document: 20150723 Kind code of ref document: A |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 15824753 Country of ref document: EP Kind code of ref document: A1 |