WO2020170537A1 - 空気入りタイヤ - Google Patents
空気入りタイヤ Download PDFInfo
- Publication number
- WO2020170537A1 WO2020170537A1 PCT/JP2019/046039 JP2019046039W WO2020170537A1 WO 2020170537 A1 WO2020170537 A1 WO 2020170537A1 JP 2019046039 W JP2019046039 W JP 2019046039W WO 2020170537 A1 WO2020170537 A1 WO 2020170537A1
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- WO
- WIPO (PCT)
- Prior art keywords
- tire
- fin
- block
- fins
- plane
- 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
- B60C11/0311—Patterns comprising tread lugs arranged parallel or oblique to the axis of rotation
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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
- B60C11/13—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0339—Grooves
- B60C2011/0358—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane
- B60C2011/0365—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane characterised by width
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0339—Grooves
- B60C2011/0358—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane
- B60C2011/0367—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane characterised by depth
Definitions
- the present invention relates to a pneumatic tire, and more specifically to a pneumatic tire capable of improving the cooling performance of the tread portion.
- Heavy-duty tires especially construction vehicle tires, have the problem that the tread heats up when the vehicle is running, causing separation.
- a conventional pneumatic tire has fins or uneven portions on the buttress portion and increases the surface area of the buttress portion to promote heat dissipation from the buttress portion.
- the purpose of this invention is to provide a pneumatic tire capable of improving the cooling performance of the tread portion.
- a pneumatic tire according to the present invention includes a plurality of lug grooves extending in the tire width direction and opening to a buttress portion, and a first lug and a second lug that are adjacent to each other with one lug groove interposed therebetween. And a fin disposed on a side wall surface of the block and extending in a tire circumferential direction, the ground contact ends of the first and second blocks and the first and second blocks. Defining a local plane X including an arc connecting the open ends of the three lug grooves partitioning the block of the block, the fins of the first and second blocks defining one of the circumferential directions of the block.
- the groove wall of the lug groove is extended outward in the tire width direction with respect to the plane X, and the protrusion amount of the fin with respect to the plane X is from the one circumferential direction edge portion of the block to the other circumferential direction. It is characterized in that it gradually decreases toward the direction edge portion.
- the air on the side wall surface of the first block on the first-arrival side is guided by the fins and flows toward the second block on the last-arrival side.
- the protrusion amount of the fins gradually decreases from the first-arrival side to the second-arrival side of the block, so that separation of the air flow from the side wall surfaces of the fins is suppressed and the air is efficiently guided.
- a part of the air hits the groove walls of the lug grooves between the blocks and flows into the lug grooves.
- the fins of the second block extend the groove wall of the lug groove outward in the tire width direction at the circumferential edge portion on the first-arrival side of the block, the extension of this groove wall allows air to flow into the lug groove. Inflow is promoted. Thereby, there is an advantage that the tread portion of the tire is efficiently cooled and the temperature rise of the tire is effectively suppressed.
- FIG. 1 is a cross-sectional view in the tire meridian direction showing a pneumatic tire according to an embodiment of the present invention.
- FIG. 2 is a perspective view showing a buttress portion of the pneumatic tire shown in FIG.
- FIG. 3 is a sectional view of the buttress portion shown in FIG.
- FIG. 4 is an explanatory view showing the fins of the buttress portion shown in FIG.
- FIG. 5 is explanatory drawing which shows the fin of the buttress part described in FIG.
- FIG. 6 is an explanatory view showing a modified example of the pneumatic tire shown in FIG.
- FIG. 7 is explanatory drawing which shows the modification of the pneumatic tire shown in FIG.
- FIG. 8 is explanatory drawing which shows the modification of the pneumatic tire shown in FIG. FIG.
- FIG. 9 is explanatory drawing which shows the modification of the pneumatic tire shown in FIG.
- FIG. 10 is explanatory drawing which shows the modification of the pneumatic tire shown in FIG.
- FIG. 11 is an explanatory diagram showing a modified example of the pneumatic tire shown in FIG.
- FIG. 12 is an explanatory diagram showing a modified example of the pneumatic tire shown in FIG.
- FIG. 13 is explanatory drawing which shows the modification of the pneumatic tire shown in FIG.
- FIG. 14 is explanatory drawing which shows the modification of the pneumatic tire shown in FIG.
- FIG. 15 is an explanatory diagram showing a modified example of the pneumatic tire shown in FIG.
- FIG. 16 is explanatory drawing which shows the modification of the pneumatic tire shown in FIG. FIG.
- FIG. 17 is an explanatory diagram showing a modified example of the pneumatic tire shown in FIG.
- FIG. 18 is an explanatory diagram showing a modified example of the pneumatic tire shown in FIG.
- FIG. 19 is explanatory drawing which shows the modification of the pneumatic tire shown in FIG.
- FIG. 20 is an explanatory view showing a modified example of the pneumatic tire shown in FIG.
- FIG. 21 is an explanatory view showing a modified example of the pneumatic tire shown in FIG.
- FIG. 22 is a chart showing results of performance tests of pneumatic tires according to the embodiment of the present invention.
- FIG. 23 is explanatory drawing which shows the pneumatic tire of a prior art example.
- FIG. 1 is a cross-sectional view in the tire meridian direction showing a pneumatic tire according to an embodiment of the present invention. This figure shows a cross-sectional view of one side region in the tire radial direction taken along the lug groove, and shows a construction vehicle tire called an OR tire (Off the Road Tire) as an example of a pneumatic tire. ..
- the section in the tire meridian direction means a section when the tire is cut along a plane including the tire rotation axis (not shown).
- Reference numeral CL is a tire equatorial plane, and refers to a plane that passes through the center point of the tire in the tire rotation axis direction and is perpendicular to the tire rotation axis.
- the tire width direction means a direction parallel to the tire rotation axis
- the tire radial direction means a direction perpendicular to the tire rotation axis.
- the pneumatic tire 1 has an annular structure centering on the tire rotation axis, and has a pair of bead cores 11 and 11, a pair of bead fillers 12 and 12, a carcass layer 13, a belt layer 14, and a tread rubber 15. And a pair of sidewall rubbers 16 and 16 and a pair of rim cushion rubbers 17 and 17 (see FIG. 1).
- the pair of bead cores 11 and 11 are formed by winding one or more bead wires made of steel in an annular shape and in multiple layers to form the cores of the left and right bead parts.
- the pair of bead fillers 12, 12 are arranged on the outer circumferences of the pair of bead cores 11, 11 in the tire radial direction to reinforce the bead portion.
- the carcass layer 13 has a single-layer structure composed of one carcass ply or a multilayer structure formed by laminating a plurality of carcass plies.
- the carcass layer 13 is bridged in a toroidal shape between the left and right bead cores 11 to form a tire frame. Make up. Further, both ends of the carcass layer 13 are rolled back and locked to the outside in the tire width direction so as to surround the bead core 11 and the bead filler 12.
- the carcass ply of the carcass layer 13 is formed by coating a plurality of carcass cords made of steel with coating rubber and rolling the same.
- the absolute value is 80 [deg] or more and 90 [deg] or less, and a bias.
- a tire has a cord angle of 30 [deg] or more and 45 [deg] or less (defined as an inclination angle in the longitudinal direction of the carcass cord with respect to the tire circumferential direction).
- the belt layer 14 is formed by stacking at least two belt plies 141 to 144, and is arranged around the outer circumference of the carcass layer 13.
- a radial tire four to eight belt plies are laminated to form the belt layer 14 (not shown).
- each of the belt plies 141 to 144 is formed by rolling a steel cord with a coated rubber.
- each of the belt plies 141 to 144 has a belt angle of a different sign with respect to the adjacent belt plies, and the belt cords are laminated by alternately inverting the inclination directions of the belt cords to the left and right. Thereby, a cross ply structure is formed and the structural strength of the belt layer 14 is enhanced.
- two or more belt plies are laminated to form the belt layer 14 (not shown).
- Each belt ply is made of the above steel cord or woven fabric.
- the tread rubber 15 is arranged on the tire radial outer periphery of the carcass layer 13 and the belt layer 14 to form a tread portion of the tire.
- the pair of sidewall rubbers 16 and 16 are arranged on the tire width direction outer side of the carcass layer 13 to form left and right sidewall portions.
- the pair of rim cushion rubbers 17, 17 are respectively arranged on the inner side in the tire radial direction of the rewound portions of the left and right bead cores 11, 11 and the carcass layer 13 to form a rim fitting surface of the bead portion.
- FIG. 2 is a perspective view showing a buttress portion of the pneumatic tire shown in FIG.
- FIG. 3 is a sectional view of the buttress portion shown in FIG. These figures show the buttress portion of one shoulder region.
- the buttress portion is defined as a non-ground area formed at the connecting portion between the profile of the tread portion and the profile of the sidewall portion, and the side wall surface on the outer side in the tire width direction of the shoulder land portion (block 3 in FIG. 2) is defined.
- the tire rotation direction shown in FIG. 2 is defined as a rotation direction that is frequently used when the tire is used, more specifically, a rotation direction when the vehicle moves forward. Further, the tire rotation direction defines the first-arriving side (so-called stepping side or toe side) and the last-arriving side (so-called kicking side or heel side) of the block when the tire touches the ground.
- the pneumatic tire also includes a rotation direction display unit (not shown) that indicates the tire rotation direction.
- the rotation direction display portion is configured by, for example, a mark or unevenness provided on the sidewall portion of the tire.
- the pneumatic tire 1 includes a plurality of lug grooves 2 and a plurality of blocks 3 (3A, 3B).
- the lug groove 2 is a so-called shoulder lug groove, which extends in the tire width direction in the tread shoulder area and opens in the buttress portion of the tire beyond the tire ground contact end T. Further, the plurality of lug grooves 2 are arranged at a predetermined pitch in the tire circumferential direction. In the configuration shown in FIG. 2, the plurality of lug grooves 2 terminate at the same position in the tire radial direction at the buttress portion of the tire. However, not limited to this, a so-called decorative groove may be formed in the buttress portion and connected to the lug groove 2 (not shown).
- the groove width Wg (see FIG. 2) of the lug groove 2 at the tire ground contact end T is preferably in the range of 10 [mm] ⁇ Wg ⁇ 200 [mm], and 30 [mm] ⁇ Wg ⁇ 100 [mm ] Is more preferable.
- the groove depth Hg (see FIG. 3) of the lug groove 2 at the tire ground contact end T is preferably in the range of 20 [mm] ⁇ Hg ⁇ 180 [mm], and 50 [mm] ⁇ Hg ⁇ 120 [ mm] is more preferable.
- the reference numeral “21” in FIG. 3 is the groove bottom of the lug groove 2.
- Groove width is measured as the distance between the left and right groove walls in the groove opening when the tire is mounted on the specified rim and the specified internal pressure is filled and no load is applied.
- the land part has a notch or chamfered part in the edge part, in the cross-sectional view with the groove length direction as the normal direction, the intersection of the tread surface and the extension line of the groove wall is the measurement point, and the groove width Is measured.
- the groove depth is measured as the distance from the tread surface to the groove bottom when the tire is mounted on the specified rim and the tire is filled with the specified internal pressure in an unloaded state. Further, in a configuration in which the groove has a partial uneven portion or a sipe on the groove bottom, the groove depth is measured excluding these.
- the tire ground contact end T is a contact surface between the tire and the flat plate when the tire is attached to a specified rim and a specified internal pressure is applied, and the tire is placed perpendicular to the plate in a stationary state and a load corresponding to the specified load is applied. Is defined as the maximum width position in the tire axial direction.
- the specified rim refers to “applied rim” specified in JATMA, “Design Rim” specified in TRA, or “Measuring Rim” specified in ETRTO.
- the specified internal pressure means the “maximum air pressure” specified by JATMA, the maximum value of "TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES" specified by TRA, or “INFLATION PRESSURES” specified by ETRTO.
- the specified load means the "maximum load capacity" specified in JATMA, the maximum value of "TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES" specified in TRA, or the "LOAD CAPACITY” specified in ETRTO.
- the specified internal pressure is an air pressure of 180 [kPa] and the specified load is 88[%] of the maximum load capacity.
- the block 3 is a so-called shoulder block, which is divided into adjacent lug grooves 2 and 2 and is arranged on the tire ground contact end T (see FIG. 2). Further, the plurality of blocks 3 are arranged at a predetermined pitch in the tire circumferential direction. Further, the number of pitches of the blocks 3 is preferably in the range of 10 or more and 50 or less, and more preferably in the range of 20 or more and 40 or less.
- the ground contact ends (included in the tire ground contact end T) of a pair of blocks 3A and 3B adjacent to each other in the tire circumferential direction, and three lug grooves that partition these blocks 3A and 3B.
- a local plane X including an arc Le connecting the two open ends is defined.
- the opening end of the lug groove 2 is defined as the innermost point in the tire radial direction of the opening of the lug groove 2 in the buttress portion.
- a tire radial direction distance D1 from the tire ground contact end T to the arc Le and a tire sectional height SH are 0.05 ⁇ D1/ It is preferable to have a relationship of SH ⁇ 0.40, and it is more preferable to have a relationship of 0.10 ⁇ D1/SH ⁇ 0.30. In particular, for construction vehicle tires, the distance D1 is in the range of 35 [mm] ⁇ D1.
- the tire cross-section height SH is 1/2 the difference between the tire outer diameter and the rim diameter, and is measured with the tire mounted on the specified rim and applying the specified internal pressure, as well as in the unloaded state.
- FIG. 4 shows a sectional view taken along line B in FIG. 3
- FIG. 5 shows a plan view of the block 3 in a plan view of the plane X.
- the pneumatic tire 1 includes a plurality of fins 4 (4A, 4B) in the buttress portion.
- the fins 4 are formed on the left and right buttress portions of the tire, respectively.
- the present invention is not limited to this, and the fin 4 may be formed only on one buttress portion (not shown).
- the fins 4 are formed on the side wall surface of the block 3 (that is, the wall surface of the buttress portion) and extend in the tire circumferential direction. Specifically, the fins 4 are arranged on the side wall surface of the block 3 in a region between the tire ground contact end T and the above-described arc Le. Further, the fins 4 are arranged in each of the plurality of blocks 3 arranged in the tire circumferential direction.
- the end surface of the fin 4 on the first-arrival side in the tire rotation direction is such that the groove wall of the lug groove 2 is formed at a circumferential edge portion 31 of the block 3 with respect to the plane X. Extends to the outside in the tire width direction. Specifically, the fin 4 has a maximum projecting position P1 with respect to the plane X on one circumferential edge portion 31 of the block 3, and the maximum projecting position P1 of the fin 4 is located outside the plane X in the tire width direction. is there. Further, the groove wall of the lug groove 2 on the trailing side in the tire rotation direction extends further outward in the tire width direction than the groove wall on the leading side and projects to the buttress portion.
- the circumferential edge portion 32A on the rear side of the first block 3A is offset inward in the tire width direction with respect to the circumferential edge portion 31B on the front side of the second block 3B. Further, at this time, as shown in FIGS. 2 and 4, it is preferable that the groove wall of the lug groove 2 be smoothly extended. Specifically, the groove wall of the lug groove 2 and the end surface of the fin 4 are on the same plane and are connected to each other without a step.
- the first block 3A has a circumferential edge portion 32A on the rearward side of the first block 3A.
- the distance Da in the tire width direction to the maximum protruding position P1 of the fin 4B of the second block 3B and the circumferential length Lb of the block 3 at the tire ground contact end T are 0.10 ⁇ Da/Lb. It is preferable to have a relationship of ⁇ 1.50, and it is more preferable to have a relationship of 0.20 ⁇ Da/Lb ⁇ 0.80.
- the distance Da preferably has a relationship of 5 [mm] ⁇ Da ⁇ 100 [mm], and more preferably 10 [mm] ⁇ Da ⁇ 60 [mm].
- the offset amount (that is, the distance Da) of the circumferential edge portions 31 and 32 of the block 3 is optimized.
- the protrusion amount Hf of the fin 4 with respect to the plane X extends from one circumferential edge portion 31 of the block 3 toward the other circumferential edge portion 32, more specifically, in the tire rotation direction.
- the taper gradually decreases from the first-arrival side to the second-arrival side.
- the side wall surface of the block 3 inclines inward in the tire width direction from the first-arrival side of the block 3 toward the second-arrival side thereof.
- the shape of the fin 4 is not particularly limited, but a three-dimensional shape in which the cross-sectional area is narrowed from one circumferential edge portion 31 of the block 3 toward the other circumferential edge portion 32, in particular, a pyramid shape, a truncated pyramid shape, It preferably has a conical shape or a truncated cone shape.
- the fins 4B of the second block 3B extend the groove wall of the lug groove 2 outward in the tire width direction at the circumferential edge portion 31B on the first-arrival side of the block 3B, the lug is extended by the extension portion of the groove wall. The inflow of air into the groove 2 is promoted. Thereby, the tread portion of the tire is efficiently cooled, and the temperature rise of the tire is effectively suppressed.
- the distance D2 in the tire radial direction from the tire ground contact end T to the maximum protruding position P1 of the fin 4 is 0.20 ⁇ D2 with respect to the groove depth Hg of the lug groove 2 at the tire ground contact end T. /Hg is preferable, and 0.50 ⁇ D2/Hg is more preferable.
- the upper limit of the distance D2 is not particularly limited, but preferably has a relationship of D2/D1 ⁇ 0.80 with respect to the distance D1 in the tire radial direction from the tire ground contact end T to the arc Le. This ensures the air guiding action of the fins 4.
- the maximum protrusion amount Hf_max (see FIG. 3) of the fin 4 with respect to the plane X is preferably in the range of 1.0 [mm] ⁇ Hf_max ⁇ 50 [mm], and 5.0 [mm] ⁇ Hf_max ⁇ 30. More preferably, it is in the range of [mm].
- the maximum protrusion amount Hf_max of the fins 4 is secured, and the air guiding action of the fins 4 is secured.
- the upper limit suppresses uneven wear of the block 3 due to the arrangement of the fins 4.
- the protrusion amount Hf of the fin is measured as the maximum value of the distance from the plane X to the contour line of the fin in an arbitrary cross section with the tire circumferential direction as the normal direction, and the tire width direction outer side with respect to the plane X is defined as plus. To be done.
- the protrusion amount Hf of the fin has a maximum value Hf_max in the above-mentioned cross section including the maximum protrusion position P1. Further, as will be described later, when the side wall surface of the block has a concave shape, the protrusion amount Hf becomes negative.
- the intersection Q between the plane X and the groove wall of the lug groove 2 is defined in a cross-sectional view (see FIG. 4) that includes the maximum protruding position P1 of the fin 4 and is perpendicular to the plane X and parallel to the tire circumferential direction.
- the distance L1 in the tire circumferential direction from the intersection Q to the maximum protrusion position P1 of the fin 4 and the maximum protrusion amount Hf_max of the fin 4 have a relationship of ⁇ 0.20 ⁇ L1/Hf_max ⁇ 0.20. Is preferable, and it is more preferable to have a relationship of ⁇ 0.15 ⁇ L1/Hf_max ⁇ 0.15.
- the distance L1 is defined with the tire rotation direction being positive.
- the width Wf of the fin 4 is increased from the one circumferential edge portion 31 of the block 3 toward the other circumferential edge portion 32, more specifically, of the block 3 in the tire rotation direction. It is preferable to gradually decrease from the first-arrival side to the second-arrival side. That is, both the protrusion amount Hf and the width Wf of the fin 4 gradually decrease from the first-arrival side of the block 3 toward the second-arrival side thereof. In such a configuration, the air flow on the side wall surface of the block 3A is concentrated toward one point by the fins 4A, so that the air is efficiently guided.
- the maximum width Wf_max of the fin 4 in the tire radial direction may have a relationship of 0.50 ⁇ Wf_max/D1 with respect to the distance D1 in the tire radial direction from the tire ground contact end T to the arc Le. It is more preferable to have a relationship of 0.60 ⁇ Wf_max/D1.
- the upper limit of the maximum width Wf_max is not particularly limited, but may have a relationship of Wf_max/D1 ⁇ 1.00 with respect to the tire radial direction distance D1 (see FIG. 5) from the tire ground contact end T to the arc Le. preferable. As a result, uneven wear of the block 3 due to the arrangement of the fins 4 is suppressed.
- the fin width Wf is measured as the width of the fin in the tire radial direction in the plan view of the plane X.
- the width Wf is measured with the rising portion of the fin with respect to the side wall surface of the block as a measurement point.
- the distance L2 in the tire circumferential direction between the maximum width position of the fins 4 (the reference numeral omitted in the drawing) and the maximum protruding position P1 of the fins 4 is the circumferential length Lb of the block 3 at the tire ground contact end T. It is preferable to have a relationship of ⁇ 0.20 ⁇ L2/Lb ⁇ 0.20, and it is more preferable to have a relationship of ⁇ 0.10 ⁇ L2/Lb ⁇ 0.10. Thereby, the shape of the groove wall portion of the lug groove 2 extended by the fin 4 is optimized.
- the distance L2 is defined with the tire rotation direction being positive.
- the distance L3 in the tire circumferential direction between the minimum protruding position P2 of the fin 4 and the circumferential edge portion 32 on the rear side of the block 3 is the circumferential length Lb of the block 3 at the tire ground contact end T.
- the relationship of ⁇ 0.20 ⁇ L3/Lb ⁇ 0 is preferable, and the relationship of ⁇ 0.10 ⁇ L3/Lb ⁇ 0 is more preferable.
- the distance L3 is defined with the tire rotation direction being positive.
- the minimum protruding position P2 of the fin is defined as the point where the distance from the plane X to the contour line of the fin has the maximum value in a cross-sectional view passing through the end of the fin on the trailing side and having the tire circumferential direction as the normal direction.
- the circumferential length Lf of the fin 4 and the circumferential length Lb of the block 3 at the tire ground contact end T have a relationship of 0.50 ⁇ Lf/Lb ⁇ 1.00. , 0.80 ⁇ Lf/Lb ⁇ 1.00 is more preferable. Thereby, the circumferential length Lf of the fin 4 is properly secured.
- the circumferential length Lf of the fin is measured as the length in the tire circumferential direction from the maximum protruding position P1 to the minimum protruding position P2 of the fin.
- the distance D3 in the tire radial direction between the minimum protruding position P2 of the fin 4A of the block 3A on the front side in the tire rotation direction and the maximum protruding position P1 of the fin 4B of the block 3B on the rear side is: It is preferable to have a relationship of 0 ⁇ D3/D1 ⁇ 0.80 and a relationship of 0 ⁇ D3/D1 ⁇ 0.20 with respect to the distance D1 in the tire radial direction from the tire ground contact end T to the arc Le. Is more preferable. As a result, the inflow of intake air into the lug groove 2 is promoted.
- the distance D3 is measured as the distance between the maximum protruding position P1 and the minimum protruding position P2 in the tire radial direction in the plan view of the plane X.
- the block 3 (3A, 3B) has one fin 4 (4A, 4B), respectively.
- the fin 4 has a triangular pyramid shape whose cross-sectional area is narrowed from the circumferential edge portion 31 on the front side of the block 3 toward the circumferential edge portion 32 on the rear side.
- the end surface of the fin 4, that is, the triangular pyramid-shaped bottom surface is located at the circumferential edge portion 31 on the first-arrival side of the block 3, and extends the groove wall of the lug groove 2 in the tire width direction.
- the end surface of the fin 4 and the groove wall of the lug groove 2 are on the same plane, and are connected without a step.
- the maximum protruding position P1 of the fin 4 is located at the circumferential edge portion 31 on the first-arrival side of the block 3. This promotes the inflow of air from the end surfaces of the fins 4 into the lug grooves 2.
- the triangular pyramidal ridgeline of the fin 4 has a linear shape and extends in parallel to the tire circumferential direction, as shown in FIG. Further, as shown in FIG. 4, the triangular pyramid-shaped ridgeline of the fin 4 intersects the plane X inclining inward in the tire width direction from the first-arrival side of the block 3 toward the second-arrival side thereof. For this reason, the protrusion amount Hf of the fin 4 gradually decreases from the first-arrival side of the block 3 toward the second-arrival side, and becomes negative at the circumferential edge portion 32 on the trailing-side of the block 3.
- the fins 4A and 4B arranged in the tire circumferential direction are arranged in a shark fin shape, and the circumferential edge portion 32A on the rear end side of the first block 3A and the circumferential direction on the front end side of the second block 3B.
- a step is formed between the edge portion 31B and the edge portion 31B. This promotes the inflow of air from the end surfaces of the fins 4 into the lug grooves 2.
- the fins 4 extend continuously over the entire area of the block 3 in the tire circumferential direction. Therefore, as shown in FIG. 5, the triangular pyramid-shaped end surface of the fin 4 is located at the circumferential edge portion 31 of the first-arrival side of the block 3, and the triangular-pyramidal vertex of the fin 4 is located at the rear-end side of the block 3. At the edge portion 32 in the circumferential direction. As a result, the circumferential length Lf of the fin 4 is set to be large.
- the distance D2 in the tire radial direction from the tire ground contact end T to the maximum protruding position P1 of the fin 4 is the tire radial direction distance D1 from the tire ground contact end T to the arc Le. Is arranged at a position of about 50[%].
- the maximum protruding position P1 of the fin 4 may be arranged at a position 50% or more of the distance D1.
- the distances D1 and D2 preferably have a relationship of 0.20 ⁇ D2/D1 ⁇ 0.80, and more preferably have a relationship of 0.40 ⁇ D2/D1 ⁇ 0.60.
- the maximum protruding position P1 of the fin 4 is arranged at a position 50% or more of the distance D1 to promote the inflow of air from the fin 4 into the lug groove 2.
- a part of the circumferential edge portion 32A on the rear end side of the first block 3A is on the front end side of the second block 3B that faces the lug groove 2. It is offset inward in the tire width direction with respect to the circumferential edge portion 31B.
- the rearward side circumferential edge portion 32A of the first block 3A is partially recessed with respect to the plane X at the rearward end of the fin 4A, and as a result, the fins The rear end of 4A is located inside the plane X in the tire width direction.
- the distance Da in the tire width direction from the circumferential edge portion 32A on the rear side of the first block 3A to the maximum protruding position P1 of the fin 4B of the second block 3B becomes large, and the fin 4 and the lug groove It is preferable in that the inflow of air into 2 is promoted.
- the offset amount Di to the inner side in the direction is preferably in the range of 0 ⁇ Di/Lb ⁇ 1.00 with respect to the circumferential length Lb of the block 3 at the tire ground contact end T, and 0.20 ⁇ Di/Lb. More preferably, it is in the range of ⁇ 0.50. Further, the offset amount Di is preferably in the range of ⁇ 30 [mm] ⁇ Di in actual dimensions.
- the lower limit suppresses uneven wear of the block 3 due to an excessive offset amount of the circumferential edge portion 32A.
- the upper limit ensures an appropriate offset amount Di and promotes the inflow of air from the fins 4 into the lug grooves 2.
- the offset amount Di is measured with the distance from the plane X inward in the tire width direction being positive.
- the distance Da in the tire width direction from the circumferential edge portion 32A on the rear side of the first block 3A to the maximum protruding position P1 of the fin 4B of the second block 3B is appropriately secured. The inflow of air from the fins 4 into the lug groove 2 is ensured.
- the groove wall on the rear side of the lug groove 2 is a flat surface, and as shown in FIG. 4, it includes the maximum protruding position P1 of the fin 4 and is perpendicular to the plane X and parallel to the tire circumferential direction.
- the maximum protruding position P1 of the fin 4 protrudes inside the lug groove 2 and is located on the first-arrival side in the tire rotation direction with respect to the point Q. Therefore, the groove wall on the rear end side of the lug groove 2 is bent or curved toward the first end side in the tire rotation direction. This promotes the inflow of air from the fins 4 into the lug grooves 2.
- the groove wall on the trailing side of the lug groove 2 is formed. It may be bent or curved in the direction of expanding the groove width.
- the upper limit of the ratio L1/Hf_max between the distance L1 in the tire circumferential direction from the intersection Q to the maximum protruding position P1 of the fin 4 and the maximum protruding amount Hf_max of the fin 4 is within the above range, The function is properly secured.
- the circumferential edge portion 32 on the rear end side of the block 3 may have a chamfered portion at the connection portion to the groove wall of the lug groove 2. This promotes the inflow of air from the fins 4 into the lug grooves 2.
- the circumferential edge portion 32 serves as the measurement point in such a configuration, the intersection of the extension line of the side wall surface of the block 3 and the extension line of the groove wall of the lug groove 2 is used as the measurement point.
- the maximum width position of the fin 4 is on the intersection line Q′ between the plane X (see FIG. 2) and the groove wall of the lug groove 2, and the maximum protruding position P1 of the fin 4 is It is on the rear end side in the tire rotation direction with respect to the intersection line Q′ on the front end side of the block 3. Therefore, the distance L2 of the maximum protruding position P1 of the fin 4 is L2 ⁇ 0. Even with such a configuration, the function of the fin 4 is properly ensured by satisfying the condition of the ratio L2/Lb described above.
- the fins 4 are shorter than the circumferential length Lb of the block 3, and the minimum projecting position P2 of the fins 4 is on the first-arrival side of the rear-edge side circumferential edge portion 32 of the block 3. is there. Therefore, the distance L3 of the minimum protruding position P2 of the fin 4 is 0 ⁇ L3. Even with such a configuration, the function of the fin 4 is properly ensured by satisfying the condition of the ratio L3/Lb described above.
- the fins 4 have a trapezoidal shape in a plan view, and the minimum width Wf_min of the fins 4 at the trailing end is 0 ⁇ Wf_min.
- the maximum width Wf_max on the first-arrival side of the fin 4 and the minimum width Wf_min on the last-arrival side have a relationship of 0 ⁇ Wf_min/Wf_max ⁇ 0.50, and 0 ⁇ Wf_min/Wf_max ⁇ 0. More preferably, it has a relationship of 10.
- the width Wf of the fin 4 is appropriately reduced from the first-arrival side to the second-arrival side, and the air guiding action of the fin 4 is ensured.
- the minimum protruding position P2 and the maximum protruding position P1 of the fins 4A and 4B that are adjacent to each other with the lug groove 2 interposed therebetween are at the same position in the tire radial direction.
- the fins 4 are inclined inward in the tire radial direction from the first-arrival side to the second-arrival side in the tire rotation direction. Therefore, the distance D3 in the tire radial direction between the minimum protruding position P2 and the maximum protruding position P1 of the fins 4A, 4B adjacent to each other across the lug groove 2 is 0 ⁇ D3. In this way, the rear end portion (minimum protruding position P2) of the fin 4 may be located inside the maximum protruding position P1 in the tire radial direction (see FIG. 15), or located outside the tire radial direction. It may be (not shown).
- the maximum width Wf_max of the fin 4 in the tire radial direction is equal to the distance D1 in the tire radial direction from the tire ground contact end T to the arc Le. Therefore, the fins 4 extend over the entire area from the tire ground contact end T to the arc Le.
- the maximum width Wf_max of the fin 4 is set smaller than the distance D1. Further, the maximum protruding position P1 of the fin 4 is located on the inner side in the tire radial direction with respect to the midpoint (not shown) of the distance D1. Further, the fins 4A and 4B adjacent to each other with the lug groove 2 interposed therebetween are located at the same position in the tire radial direction. Even with such a configuration, it is possible to suppress uneven wear of the block 3 while ensuring the function of the fin 4.
- the fin 4 has a triangular pyramid shape.
- the end surface of the fin 4 on the first-arrival side has a triangular shape whose base is the line Q'of the plane X and the groove wall of the lug groove 2.
- the end of the fin 4 on the rear side is converged to one point.
- the fin 4 has a quadrangular pyramid shape, and the end surface of the fin 4 on the first-arrival side has a quadrangle.
- the fin 4 has a truncated pyramid shape, and the end of the fin 4 on the trailing side projects from the side wall surface of the block 3. Even with such a configuration, the function of the fin 4 can be ensured.
- the maximum protruding position P1 and the minimum protruding position P2 of the fin 4 are defined as the midpoints of the end sides for convenience.
- a part of the circumferential edge portion 32 on the rear side of the block 3 is recessed inward in the tire width direction with respect to the plane X. This promotes the inflow of air from the fins 4 into the lug grooves 2.
- the present invention is not limited to this, and as shown in FIG. 19, the circumferential edge portion 32 on the rear side of the block 3 may be flat with respect to the plane X.
- each block 3A; 3B includes a single fin 4A; 4B, and the fins 4A, 4B of the adjacent blocks 3A, 3B have a pyramidal shape (that is, a direction in which the protrusion amount Hf gradually decreases). ) Are aligned.
- the tire rotation direction is designated as the pyramid-shaped bottom surface side of the fins 4A and 4B as the first-arrival side in the tire rotation direction, so that the inflow of air from the fins 4 to the lug grooves 2 is promoted, and the above-described is performed.
- a cooling effect of the tread portion can be obtained.
- each block 3A; 3B includes a pair of fins 4A, 4B arranged in the tire radial direction.
- the height of the pair of fins 4A, 4B; 4B, 4A gradually decreases in mutually different directions in the tire circumferential direction.
- the fins 4A and 4B on the tire radial outside are arranged with the pyramidal shape oriented in one direction in the tire circumferential direction, and the fins 4B on the tire radial inside. 4A are arranged so that the directions of the pyramidal shape are aligned in the other direction of the tire circumferential direction.
- the fins 4A, 4B; 4B, 4A of each block 3A; 3B are arranged adjacent to each other in the tire radial direction.
- the present invention is not limited to this, and the fins 4A and 4B adjacent in the tire radial direction may be arranged apart from each other (not shown).
- the plurality of lug grooves 2 extending in the tire width direction and opening to the buttress portion and the first and second blocks adjacent to each other with one lug groove 2 interposed therebetween. 3A and 3B (see FIG. 2).
- the pneumatic tire 1 also includes fins 4A and 4B arranged on the side wall surfaces of the blocks 3A and 3B and extending in the tire circumferential direction. Further, a local plane X including the grounded ends of the first and second blocks 3A and 3B and an arc connecting the opening ends of the three lug grooves 2 that partition the first and second blocks 3A and 3B. Is defined.
- the fins 4A and 4B of the first and second blocks 3A and 3B are arranged such that the groove wall of the lug groove 2 is formed in the tire width more than the plane X in the circumferential edge portions 31A and 31B of the blocks 3A and 3B. Extend outward in the direction (see Figure 4). Further, the protrusion amount Hf of the fins 4A, 4B with respect to the plane X (see FIG. 4) gradually decreases from one circumferential edge portion 31A, 31B of the blocks 3A, 3B toward the other circumferential edge portion 32A, 32B.
- the fins 4B of the second block 3B extend the groove wall of the lug groove 2 outward in the tire width direction at the circumferential edge portion 31B on the first-arrival side of the block 3B, the lug is extended by the extension portion of the groove wall. The inflow of air into the groove 2 is promoted. Thereby, there is an advantage that the tread portion of the tire is efficiently cooled and the temperature rise of the tire is effectively suppressed.
- the pneumatic tire 1 in a cross-sectional view including the maximum protruding position P1 of the fin 4 and perpendicular to the plane X and parallel to the tire circumferential direction, from the other circumferential edge portion 32A of the first block 3A to the second circumferential edge portion 32A.
- the distance Da in the tire width direction to the maximum protruding position P1 of the fin 4B of the block 3B (see FIG. 4) and the circumferential length Lb of the block 3A at the tire ground contact end T are 0.10 ⁇ Da/Lb ⁇ . It has a relationship of 1.50.
- the offset amount (that is, the distance Da) of the circumferential edge portions 32A and 31B of the blocks 3A and 3B is optimized. That is, the lower limit secures the offset amount of the circumferential edge portions 32A and 31B, and promotes the inflow of air from the fins 4A into the lug grooves 2. Further, the upper limit suppresses uneven wear of the blocks 3A and 3B due to an excessive offset amount of the circumferential edge portions 32A and 31B.
- the distance D2 in the tire radial direction from the tire ground contact end T to the maximum protruding position P1 of the fin 4 is the groove depth Hg of the lug groove 2 at the tire ground contact end T.
- it has a relationship of 0.20 ⁇ D2/Hg.
- the maximum protrusion amount Hf_max of the fin 4 with respect to the plane X is in the range of 1.0 [mm] ⁇ Hf_max ⁇ 50 [mm].
- the plane X and the groove wall of the lug groove 2 are seen in a cross-sectional view (see FIG. 4) that includes the maximum protruding position P1 of the fin 4 and is perpendicular to the plane X and parallel to the tire circumferential direction.
- the distance L1 in the tire circumferential direction from the intersection Q to the maximum protrusion position P1 of the fin 4 and the maximum protrusion amount Hf_max of the fin 4 have a relationship of ⁇ 0.20 ⁇ L1/Hf_max ⁇ 0.20.
- the maximum width Wf_max of the fins 4 in the tire radial direction (see FIG. 5) is 0.50 ⁇ Wf_max with respect to the distance D1 in the tire radial direction from the tire ground contact end T to the arc Le. /D1 relationship.
- the circumferential length Lf of the fin 4 (see FIG. 5) and the circumferential length Lb of the block 3 at the tire ground contact end T are 0.50 ⁇ Lf/Lb ⁇ 1. 00 relationship. Thereby, there is an advantage that the circumferential length Lf of the fin 4 is secured and the air guiding action by the fin 4 is secured.
- the distance D3 in the tire radial direction between the minimum protruding position P2 of the fin 4A of the first block 3A and the maximum protruding position P1 of the fin 4B of the second block 3B is the tire ground contact end T.
- the width Wf of the fin 4 gradually decreases from one circumferential edge portion 31 of the block 3 toward the other circumferential edge portion 32 (see FIG. 5).
- the maximum width Wf_max (see FIG. 5) and the minimum width Wf_min (dimension symbols omitted in the figure) of the fin 4 have a relationship of 0 ⁇ Wf_min/Wf_max ⁇ 0.50.
- the fins 4 have a pyramidal shape or a truncated cone shape in which the cross-sectional area decreases from one circumferential edge portion 31 of the block 3 toward the other circumferential edge portion 32 (see FIG. 2). ).
- the shape of the fin 4 is optimized and the air guiding action of the fin 4 is improved.
- the offset amount Di inward in the width direction is in the range of 0 ⁇ Di/Lb ⁇ 1.00 with respect to the circumferential length Lb of the block at the tire ground contact end T (see FIG. 4 ).
- at least a part of the other circumferential edge portion 32A of the block 3 is offset inward in the tire width direction, which has the advantage of promoting the inflow of intake air from the buttress portion to the lug groove 2.
- the protrusion amounts Hf of the first and second fins 4A and 4B gradually decrease in mutually different directions in the tire circumferential direction (see FIGS. 20 and 21).
- the inflow of air from the fins 4 into the lug grooves 2 is promoted in any tire rotation direction, and there is an advantage that a cooling action of the tread portion can be obtained.
- the groove depth Hg of the lug groove 2 at the tire ground contact end T is in the range of 20 [mm] ⁇ Hg ⁇ 180 [mm].
- the distance D1 in the tire radial direction from the tire ground contact end T to the arc Le is within the range of 35 [mm] ⁇ D1.
- FIG. 22 is a chart showing the results of the performance test of the pneumatic tire according to the embodiment of the present invention.
- FIG. 23 is explanatory drawing which shows the pneumatic tire of a prior art example.
- test tires were evaluated for (1) cooling performance of the tread and (2) uneven wear resistance.
- a test tire having a tire size of 2700R49 is assembled to the JATMA specified rim, and an internal pressure of 700 [kPa] and a load of 267.23 [kN] are applied to the test tire. Further, the test tires are mounted on all wheels of a construction vehicle, which is a test vehicle.
- the tire inner surface temperature of the tread part before and after the test vehicle has run for 60 minutes at a running speed of 10 [km/h] is measured. Then, based on this measurement result, index evaluation is performed using the conventional example as a reference (100). In this evaluation, the larger the numerical value, the smaller the temperature rise in the tread portion, which is preferable.
- the test tire of the example has the configuration shown in FIGS. 1 and 2, and the fins 4 are provided on the side wall surface of the block 3.
- the circumferential length Lb of the block 3 at the tire ground contact end T is 200 [mm]
- the groove depth Hg of the lug groove 2 is 100 [mm].
- the conventional test tire has the configuration shown in FIG. 23 and does not have the fin 4 shown in FIG.
- test results show, it is understood that the test tires of the examples have both the cooling performance and the uneven wear resistance of the tires.
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Abstract
Description
図1は、この発明の実施の形態にかかる空気入りタイヤを示すタイヤ子午線方向の断面図である。同図は、タイヤ径方向の片側領域をラグ溝に沿って切断した断面図を示し、また、空気入りタイヤの一例として、ORタイヤ(Off the Road Tire)と呼ばれる建設車両用タイヤを示している。
図2は、図1に記載した空気入りタイヤのバットレス部を示す斜視図である。図3は、図2に記載したバットレス部を示すA視断面図である。これらの図は、一方のショルダー領域のバットレス部を示している。
図4および図5は、図2に記載したバットレス部のフィンを示す説明図である。これらの図において、図4は、図3におけるB視断面図を示し、図5は、平面Xの平面視におけるブロック3の平面図を示している。
図6~図21は、図2に記載した空気入りタイヤの変形例を示す説明図である。これらの図において、上記した構成要素と同一の構成要素には同一の符号を付し、その説明を省略する。
以上説明したように、この空気入りタイヤ1では、タイヤ幅方向に延在してバットレス部に開口する複数のラグ溝2と、1つのラグ溝2を挟んで隣り合う第一および第二のブロック3A、3Bとを備える(図2参照)。また、空気入りタイヤ1は、ブロック3A、3Bの側壁面に配置されてタイヤ周方向に延在するフィン4A、4Bを備える。また、第一および第二のブロック3A、3Bの接地端と第一および第二のブロック3A、3Bを区画する3つのラグ溝2の開口端部を接続した円弧とを含む局所的な平面Xを定義する。このとき、第一および第二のブロック3A、3Bのフィン4A、4Bが、ブロック3A、3Bの一方の周方向エッジ部31A、31Bにて、ラグ溝2の溝壁を平面Xよりもタイヤ幅方向外側に延長する(図4参照)。また、平面Xに対するフィン4A、4Bの突出量Hf(図4参照)が、ブロック3A、3Bの一方の周方向エッジ部31A、31Bから他方の周方向エッジ部32A、32Bに向かって漸減する。
Claims (15)
- タイヤ幅方向に延在してバットレス部に開口する複数のラグ溝と、1つの前記ラグ溝を挟んで隣り合う第一および第二のブロックとを備える空気入りタイヤであって、
前記ブロックの側壁面に配置されてタイヤ周方向に延在するフィンを備え、
前記第一および第二のブロックの接地端と前記第一および第二のブロックを区画する3つの前記ラグ溝の開口端部を接続した円弧とを含む局所的な平面Xを定義し、
前記第一および第二のブロックの前記フィンが、前記ブロックの一方の周方向エッジ部にて、前記ラグ溝の溝壁を平面Xよりもタイヤ幅方向外側に延長し、且つ、
平面Xに対する前記フィンの突出量が、前記ブロックの前記一方の周方向エッジ部から他方の周方向エッジ部に向かって漸減することを特徴とする空気入りタイヤ。 - 前記フィンの最大突出位置を含み平面Xに垂直かつタイヤ周方向に平行な断面視にて、前記第一のブロックの前記他方の周方向エッジ部から前記第二のブロックの前記フィンの最大突出位置までのタイヤ幅方向の距離Daと、タイヤ接地端における前記ブロックの周方向長さLbとが、0.10≦Da/Lb≦1.50の関係を有する請求項1に記載の空気入りタイヤ。
- タイヤ接地端から前記フィンの最大突出位置までのタイヤ径方向の距離D2が、タイヤ接地端における前記ラグ溝の溝深さHgに対して、0.20≦D2/Hgの関係を有する請求項1または2に記載の空気入りタイヤ。
- 平面Xに対する前記フィンの最大突出量Hf_maxが、1.0[mm]≦Hf_max≦50[mm]の範囲にある請求項1~3のいずれか一つに記載の空気入りタイヤ。
- 前記フィンの最大突出位置を含み平面Xに垂直かつタイヤ周方向に平行な断面視にて、平面Xと前記ラグ溝の溝壁との交点から前記フィンの前記最大突出位置までのタイヤ周方向の距離L1と、前記フィンの最大突出量Hf_maxとが、-0.20≦L1/Hf_max≦0.20の関係を有する請求項1~4のいずれか一つに記載の空気入りタイヤ。
- 前記フィンのタイヤ径方向の最大幅Wf_maxが、タイヤ接地端Tから円弧Leまでのタイヤ径方向の距離D1に対して、0.50≦Wf_max/D1の関係を有する請求項1~5のいずれか一つに記載の空気入りタイヤ。
- 前記フィンの周方向長さLfと、タイヤ接地端における前記ブロックの周方向長さLbとが、0.50≦Lf/Lb≦1.00の関係を有する請求項1~6のいずれか一つに記載の空気入りタイヤ。
- 前記第一のブロックの前記フィンの最小突出位置と前記第二のブロックの前記フィンの最大突出位置とのタイヤ径方向の距離D3が、タイヤ接地端Tから円弧Leまでのタイヤ径方向の距離D1に対して、0≦D3/D1≦0.80の関係を有する請求項1~7のいずれか一つに記載の空気入りタイヤ。
- 前記フィンの幅が、前記ブロックの前記一方の周方向エッジ部から前記他方の周方向エッジ部に向かって漸減する請求項1~8のいずれか一つに記載の空気入りタイヤ。
- 前記フィンの最大幅Wf_maxおよび最小幅Wf_minが、0<Wf_min/Wf_max≦0.50の関係を有する請求項9に記載の空気入りタイヤ。
- 前記フィンが、前記ブロックの前記一方の周方向エッジ部から前記他方の周方向エッジ部に向かって断面積を狭める錐形状あるいは錐台形状を有する請求項1~10のいずれか一つに記載の空気入りタイヤ。
- 前記フィンの最大突出位置を含み平面Xに垂直かつタイヤ周方向に平行な断面視にて、平面Xから前記ブロックの前記他方の周方向エッジ部までのタイヤ幅方向内側へのオフセット量Diが、タイヤ接地端における前記ブロックの周方向長さLbに対して、0≦Di/Lb≦1.00の範囲にある請求項1~11のいずれか一つに記載の空気入りタイヤ。
- 1つの前記ブロックが、タイヤ径方向に配列された第一および第二の前記フィンを備え、且つ、
前記第一および第二のフィンの高さが、タイヤ周方向の相互に異なる方向に向かって漸減する請求項1~12のいずれか一つに記載の空気入りタイヤ。 - タイヤ接地端における前記ラグ溝の溝深さHgが、20[mm]≦Hg≦180[mm]の範囲にある請求項1~13のいずれか一つに記載の空気入りタイヤ。
- タイヤ接地端から前記円弧までのタイヤ径方向の距離D1が、35[mm]≦D1の範囲にある請求項1~14のいずれか一つに記載の空気入りタイヤ。
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- 2019-11-25 RU RU2021122464A patent/RU2764938C1/ru active
- 2019-11-25 WO PCT/JP2019/046039 patent/WO2020170537A1/ja active Application Filing
- 2019-11-25 CN CN201980092306.5A patent/CN113453914A/zh active Pending
- 2019-11-25 US US17/310,656 patent/US20210387477A1/en active Pending
- 2019-11-25 AU AU2019430198A patent/AU2019430198B2/en active Active
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CN113453914A (zh) | 2021-09-28 |
AU2019430198B2 (en) | 2023-05-25 |
US20210387477A1 (en) | 2021-12-16 |
RU2764938C1 (ru) | 2022-01-24 |
AU2019430198A1 (en) | 2021-08-05 |
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