WO2020054768A1 - 空気入りタイヤ - Google Patents
空気入りタイヤ Download PDFInfo
- Publication number
- WO2020054768A1 WO2020054768A1 PCT/JP2019/035722 JP2019035722W WO2020054768A1 WO 2020054768 A1 WO2020054768 A1 WO 2020054768A1 JP 2019035722 W JP2019035722 W JP 2019035722W WO 2020054768 A1 WO2020054768 A1 WO 2020054768A1
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- WIPO (PCT)
- Prior art keywords
- block
- tire
- blocks
- low
- pair
- Prior art date
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- 239000011324 bead Substances 0.000 claims description 13
- 230000000694 effects Effects 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 10
- 230000003014 reinforcing effect Effects 0.000 description 7
- 238000007599 discharging Methods 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 230000001747 exhibiting effect Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
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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
- B60C11/11—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
- B60C11/01—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
- B60C11/0311—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
- B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof
- B60C13/002—Protection against exterior elements
-
- 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
- B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof
- B60C13/02—Arrangement of grooves or ribs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/01—Shape of the shoulders between tread and sidewall, e.g. rounded, stepped or cantilevered
- B60C2011/013—Shape of the shoulders between tread and sidewall, e.g. rounded, stepped or cantilevered provided with a recessed portion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C2200/00—Tyres specially adapted for particular applications
- B60C2200/14—Tyres specially adapted for particular applications for off-road use
Definitions
- the present invention relates to a pneumatic tire suitable as a tire for traveling on unpaved roads, and more particularly, to a pneumatic tire having improved traveling performance and cut resistance on unpaved roads.
- Pneumatic tires intended for running on unpaved roads such as rough terrain, muddy terrain, snowy roads, sandy terrain, and rocky terrain generally have a tread pattern mainly composed of lug grooves or blocks having many edge components. Those having a large area are employed. Further, a side block is provided in a side region further outward in the tire width direction of a shoulder block located on the outermost side in the tire width direction of the tread portion.
- mud, etc. mud, etc.
- the traction performance is obtained by biting the pit, and the large groove area prevents the mud and the like from being clogged in the groove, thereby improving the traveling performance on an unpaved road (for example, see Patent Documents 1 and 2).
- the tire of Patent Literature 1 can be said to be a tire having a relatively small groove area and considering running performance on a pavement road.
- the tire of Patent Literature 2 has a large groove area and large individual blocks, and can be said to be a tire specialized in running performance on an unpaved road. Therefore, the former tends to have lower running performance on unpaved roads than the latter, and the latter tends to have lower performance during normal running than the former.
- the performance requirements for tires have been diversified, and there is also a need for tires for traveling on unpaved roads having an intermediate level of performance between these two types of tires.
- a measure for optimizing the shape of the groove or the block and efficiently increasing the running performance on the unpaved road is required. Further, when traveling on an unpaved road, a failure such as a chip cut easily occurs. Therefore, it is also required to improve the cut resistance while exhibiting the traveling performance on the unpaved road as described above.
- An object of the present invention is to provide a pneumatic tire with improved running performance and cut resistance on unpaved roads.
- a pneumatic tire of the present invention includes a ring-shaped tread portion extending in the tire circumferential direction, a pair of sidewall portions disposed on both sides of the tread portion, and these sidewall portions.
- a pneumatic tire provided with a pair of beads arranged on the tire radial direction inside, in the tire radial direction in the side region adjacent to the tire radial direction inside of the boundary between the tread portion and the sidewall portion And a plurality of side blocks that are defined by the side grooves and protrude from the outer surface of the side wall portion, and the side blocks have a relatively high protruding height.
- It includes two types of blocks, a high block and a low block having a relatively small raised height, and these high blocks and low blocks are alternately arranged in the tire circumferential direction.
- the high block and the low block adjacent to each other in the tire circumferential direction are a block pair
- the high block included in the block pair is such that a part of the high block and the low block included in the block pair are in contact with each other.
- the tire groove radially inner end of the side groove located between the low block is closed, and in each block pair, a pair of contours constituting the edges on both sides in the tire circumferential direction of the top surface of the high block
- a pair of contours forming the edges on both sides in the tire circumferential direction of the top surface of the low block are each formed by connecting three or more straight portions in the tire radial direction, and the boundary of each contour is
- the first straight portion is a first straight portion
- the second straight portion is a second straight portion
- the third straight portion is a third straight portion.
- the second straight portions or the third straight portions extend in the same direction at an angle difference of 15 ° or less from each other, and
- the other of the second straight portions or the third straight portions includes straight portions extending in different directions with an angle difference exceeding 15 °.
- the difference in the ridge height between the side blocks (high block and low block) adjacent in the tire circumferential direction when improving the running performance on an unpaved road by providing a side block in the side region, as described above, the difference in the ridge height between the side blocks (high block and low block) adjacent in the tire circumferential direction. And contacting a part of the high block and the low block to make these blocks function as substantially one large block, thereby maintaining an excellent edge effect by unevenness on the top surface of the block, and The block strength can be increased and the cut resistance can be improved while satisfactorily exhibiting road running performance. Further, by configuring the outline of each block as described above, a portion where the straight line portion extends substantially in parallel (a portion where the angle difference extends within 15 °) is formed by the straight portion.
- the groove can exhibit excellent earth-removing properties, and in the part where the straight part is not substantially parallel (the part including the straight part where the angle difference exceeds 15 °), a part of the high block and the low block described above is used. Thus, it is possible to reliably configure the structure in contact with the vehicle, and it is possible to effectively improve the traveling performance and cut resistance on an unpaved road.
- the third linear portion located on the other side of the high block or the low block extends toward the other of the high block or the low block.
- the difference between the heights of the high blocks and the low blocks included in the block pair is 0.5 mm or more and 4.0 mm or less.
- the shape of the unevenness formed by the top surface of the high block and the top surface of the low block is improved, which is advantageous for achieving both running performance and cut resistance on an unpaved road.
- the area of one top surface of the high block or the low block included in the block pair is 30% to 70% of the area of the other top surface.
- the area of the top surface of the low block included in the block pair is preferably 30% to 70% of the area of the top surface of the high block.
- a plurality of shoulder blocks arranged along the tire circumferential direction, along the tire width direction between the shoulder blocks adjacent in the tire circumferential direction.
- an extending shoulder lug groove is provided, and the side groove is disposed at an extension position of the shoulder lug groove.
- the innermost end in the tire radial direction of the side block exists in the range of 30% to 60% of the tire sectional height from the tire equator position toward the tire radial inner side.
- the total area of the high blocks is 32% to 52% and the total area of the low blocks is 13% to 33% with respect to the area of the side region between the boundary and the innermost end in the tire radial direction of the side blocks.
- the total area of the side grooves is preferably 25% to 45%.
- the term "contact end” refers to a tire axial direction of a contact region formed when a tire is rim assembled to a regular rim and is placed vertically on a plane with a regular internal pressure applied and a regular load is applied. At both ends.
- the "regular rim” is a rim defined for each tire in a standard system including the standard on which the tire is based. For example, a standard rim for JATMA, a "Design @ Rim” for TRA, or an ETRTO Then, “Measuring @ Rim” is set.
- "Normal internal pressure” is the air pressure specified for each tire in the standard system including the standard on which the tire is based. For JATMA, the maximum air pressure is used.
- the table “TIRE / ROAD / LIMITS / AT / VARIOUS” is used.
- the maximum value described in "COLD INFLASION PRESURES” is “INFLATION PRESSURE” for ETRTO, but is 180 kPa when the tire is for a passenger car.
- “Regular load” is a load defined for each tire in the standard system including the standard on which the tire is based.
- JATMA the maximum load capacity
- the maximum value described in "COLD INFLASION PRESSURESRES" is "LOAD CAPACITY" in the case of ETRTO, but when the tire is for a passenger car, the load is 88% of the load.
- FIG. 1 is a meridian sectional view of a pneumatic tire according to an embodiment of the present invention.
- FIG. 2 is a front view showing a tread surface of the pneumatic tire according to the embodiment of the present invention.
- FIG. 3 is an explanatory diagram showing an enlarged main part of the pneumatic tire according to the embodiment of the present invention.
- FIG. 4 is an explanatory diagram showing extracted block pairs of FIG.
- FIG. 5 is an explanatory diagram showing an example of a block pair according to another embodiment of the present invention.
- the pneumatic tire of the present invention includes a tread portion 1, a pair of sidewall portions 2 disposed on both sides of the tread portion 1, and a tire radially inner side of the sidewall portion 2. And a pair of bead portions 3.
- reference numeral CL indicates a tire equator
- reference numeral E indicates a ground end.
- FIG. 1 is a meridian cross-sectional view, it is not depicted, but the tread portion 1, the sidewall portion 2, and the bead portion 3 each extend in the tire circumferential direction to form a ring, thereby forming a pneumatic tire. Is constructed.
- the description using FIG. 1 is basically based on the illustrated meridian cross-sectional shape, but each tire constituent member extends in the tire circumferential direction and forms an annular shape.
- a carcass layer 4 is mounted between the pair of left and right bead portions 3.
- the carcass layer 4 includes a plurality of reinforcing cords extending in the tire radial direction, and is folded from the inside to the outside of the vehicle around the bead cores 5 arranged in each bead portion 3. Further, a bead filler 6 is arranged on the outer periphery of the bead core 5, and the bead filler 6 is wrapped around the main body and the folded portion of the carcass layer 4.
- a plurality of (two in FIG. 1) belt layers 7 are embedded on the outer peripheral side of the carcass layer 4 in the tread portion 1.
- Each belt layer 7 includes a plurality of reinforcing cords inclined with respect to the tire circumferential direction, and the reinforcing cords are arranged so as to cross each other between the layers.
- the inclination angle of the reinforcing cord with respect to the tire circumferential direction is set in a range of, for example, 10 ° to 40 °.
- a belt reinforcing layer 8 is provided on the outer peripheral side of the belt layer 7.
- the belt reinforcing layer 8 includes an organic fiber cord oriented in the tire circumferential direction.
- the angle of the organic fiber cord with respect to the tire circumferential direction is set to, for example, 0 ° to 5 °.
- the present invention is applied to a pneumatic tire having such a general cross-sectional structure, but the basic structure is not limited to the above.
- the present invention relates to a shoulder region and a side region (particularly, a side region) which will be described later. Therefore, the detailed shape of the tread portion 1 may be a tread pattern mainly including blocks suitable for unpaved roads as shown in FIG. Is not limited to the example.
- main grooves 10 extending along the tire circumferential direction on both sides of the tire equator CL are formed on the surface of the tread portion 1 of the pneumatic tire shown in FIG.
- These main grooves 10 have a maximum width of, for example, 9 mm to 20 mm and a groove depth of 10 mm to 18 mm. As described later, these main grooves 10 have a zigzag shape in which portions that go straight in a predetermined direction are connected via bending points.
- the three rows of land portions defined by the main grooves 10 are further divided into blocks 20 by various grooves, and the entire tread pattern is a block pattern based on the blocks 20.
- a shoulder block 21 is defined outside the pair of main grooves in the tire width direction among the plurality of blocks 20, and a center block 22 is defined between the pair of main grooves.
- the shoulder block 21 is defined by a shoulder lug groove 31 extending from the main groove 10 beyond the ground contact end E, and a plurality of shoulder blocks 21 are arranged in the tire circumferential direction.
- the center block 22 is defined by a center lug groove 32a connecting the pair of main grooves 10 and extending in the tire width direction, and an auxiliary groove 32b connecting the center lug grooves 32a adjacent in the tire circumferential direction.
- Two rows of center blocks 22 arranged on both sides of the auxiliary groove 32b are arranged repeatedly in the tire circumferential direction.
- a sipe 41 and a narrow groove 42 can be arbitrarily provided on the tread surface of the center block 22, the tread surface of the shoulder block 21, and the outer side surface in the tire width direction.
- the shoulder lug groove 31 preferably has a groove width of 9 mm to 20 mm and a groove depth of 12 mm to 17 mm, for example.
- the center lug groove 32a preferably has a groove width of, for example, 7 mm to 13 mm and a groove depth of, for example, 11 mm to 14 mm.
- the shoulder lug groove 31 preferably has the same groove depth as the main groove 10.
- the auxiliary groove 32b preferably has a groove width of, for example, 7 mm to 10 mm and a groove depth of, for example, 9 mm to 12 mm.
- the sipe 41 optionally formed is a fine groove having a groove width of, for example, 0.5 mm to 2.0 mm and a groove depth of, for example, 2 mm to 15 mm.
- the groove width and the groove depth are sufficiently smaller than the main groove 10 and the lug groove, and the groove width is, for example, 0.5 mm to 4.0 mm, and the groove depth is, for example, 2 mm to 15 mm.
- a side land portion protruding from the outer surface of the sidewall portion 2 is provided in a side region adjacent to the shoulder region provided with the shoulder block 21 on the outer side in the tire width direction.
- the land portion is further divided into a plurality of side blocks 23 by side grooves 33.
- the periphery of the tire is raised more than these side surfaces and the top surface.
- the shoulder region is adjacent to the inside of the ridge 24 (boundary between the shoulder region and the side region) in the tire width direction
- the side region is the tire having the ridge 24 (boundary between the shoulder region and the side region).
- the above-described shoulder block 21 and side block 23 are provided in the shoulder region and the side region, respectively, adjacent to the inside in the radial direction.
- the side groove 33 that partitions the side block 23 is preferably located on an extension of the shoulder lug groove 31 and extends substantially continuously, as in the example shown in the figure. Further, it is preferable that the side blocks 23 are arranged at extended positions on the outer sides in the tire width direction of the respective shoulder blocks 21 depending on the positional relationship between the grooves. When viewed from the tread side of the tread portion 1 as shown in FIG. 2, the side blocks 23 and the side grooves 33 are located outside the shoulder blocks 21 and the shoulder lug grooves 31 in the tire width direction. When viewed from the side wall portion 2 side, the side block 23 and the side groove 33 are located inside the shoulder block 21 and the shoulder lug groove 31 in the tire radial direction. In addition, that the groove is located on the extension line means that at least a part of virtual grooves extending the target grooves respectively overlap in the groove width direction.
- the side blocks 23 include two types of blocks: a high block 23H having a relatively large raised height and a low block 23L having a relatively small raised height. These high blocks 23H and low blocks 23L are alternately arranged in the tire circumferential direction. When the high block 23H and the low block 23L that are adjacent to each other in the tire circumferential direction are a block pair B, a part of the high block 23H and the low block 23L included in the block pair B are in contact with each other. The inner end in the tire radial direction of the side groove 33 located between the high block 23H and the low block 23L is closed.
- a side groove 33 whose inner end in the tire radial direction is closed is a closed groove 33A
- a side groove 33 which is located between block pairs B adjacent in the tire circumferential direction and whose inner end in the tire radial direction is open is an open groove 33B. I may say.
- each block pair B a pair of contour lines forming the edges on both sides in the tire circumferential direction of the top surface of the high block 23H and a pair of contour lines forming edges on both sides in the tire circumferential direction of the top surface of the low block 23H.
- the first straight line portion from the boundary of each contour line is referred to as a first straight line portion L1
- the second straight line portion is referred to as a second straight line portion L2
- the third straight line portion is referred to as a third straight line portion L3.
- all the first linear portions L1 included in the block pair B extend in the same direction with an angle difference of 15 ° or less and are substantially parallel to each other.
- the second straight portions L2 or the third straight portions L3 extends in the same direction at an angle difference of 15 ° or less from each other and is substantially parallel, the second straight portions L2 are mutually parallel.
- the other of the third straight portions L3 includes straight portions extending in different directions with an angle difference exceeding 15 °.
- all the first linear portions L1 included in the block pair B extend in the same direction with an angle difference of 15 ° or less from each other.
- all the second linear portions L2 included in the block pair B extend in the same direction with an angle difference of 15 ° or less and are substantially parallel to each other.
- the third straight portions L3 included in the block pair B include straight portions extending in different directions at an angle difference exceeding 15 °, and the third straight portions L3 extend in different directions from each other. ing.
- all the first linear portions L1 included in the block pair B extend in the same direction with an angle difference of 15 ° or less from each other.
- all the third linear portions L3 included in the block pair B extend in the same direction with an angle difference of 15 ° or less and are substantially parallel to each other.
- the second straight portions L2 included in the block pair B include straight portions extending in different directions at an angle difference exceeding 15 °, and the second straight portions L2 extend in different directions from each other. ing.
- the linear portions may smoothly continue through arcs.
- the first straight portion L1 and the second straight portion L2 on the side of the open groove 33B are smoothly continuous via an arc.
- the block pair B is configured as described above, an excellent edge is formed due to the unevenness of the block top surface caused by the difference in the ridge height between the side blocks 23 (the high block 23H and the low block 23L) adjacent in the tire circumferential direction. The effect can be exhibited, and the traveling performance on an unpaved road can be favorably exhibited.
- a part of the high block 23H and a part of the low block 23L come into contact with each other, and these blocks (block pair B) substantially function as one large block, so that the block strength is increased and the cut resistance is improved. Can be.
- the groove formed by the straight portions can exhibit excellent earth discharging properties. Also, in the portions where the straight portions are not substantially parallel (the third straight portion L3 in the example of FIG. 4 and the second straight portion L2 in the example of FIG. 5), a part of the high block 23H and the low block 23L is in contact with each other. Thus, the running performance and the cut resistance on an unpaved road can be effectively improved.
- the portion of the first straight portion L1 and the second straight portion L2 in the example of FIG. 4 the portion of the first straight portion L1 and the third straight portion L3 in the example of FIG. 5. If the angle difference between the straight portions exceeds 15 °, the width of the groove formed by the straight portions is not constant, and the effect of improving the earth discharging property cannot be obtained.
- two types of straight portions are included in the first to third straight portions L1 to L3 included in the three or more straight portions forming the contour as described above.
- the second straight portion L2 the first straight portion L1 and the third straight portion L3 in the example of FIG. 5 extend substantially in parallel, but less than two types of straight portions extend substantially in parallel. In this case, the groove shape becomes inappropriate, and the effect of improving the earth discharging property cannot be obtained.
- the mode of FIG. 4 in which the third linear section L3 includes linear sections extending in different directions is preferable.
- the third linear portion L3 on the closed groove 33A side of the high block 23H included in the block pair B extends toward the low block 23L.
- the third linear portion L3 on the closed groove 33A side of the low block 23L included in the block pair B may extend toward the high block 23H. Also in this case, a part of the low block 23L projects in the circumferential direction toward the high block 23H, and these blocks come into contact with each other, so that the traveling performance and cut resistance on an unpaved road can be effectively improved.
- the height of the protrusion of the side block 23 may be set to, for example, 3 mm to 7 mm.
- the side blocks 23 appropriately come into contact with the road surface, and the traveling performance of the side blocks 23 can be exhibited well.
- the difference between the heights of the high blocks 23H and the low blocks 23L included in the block pair B is preferably set to 0.5 mm or more and 4.0 mm or less. Thereby, the shape of the irregularities formed by the top surface of the high block 23H and the top surface of the low block 23L is improved, which is advantageous for achieving both traveling performance and cut resistance on an unpaved road.
- the height difference is less than 0.5 mm, the height is substantially the same, so that the edge effect due to the height difference cannot be obtained, and the running performance on unpaved roads is improved. Effect cannot be obtained sufficiently.
- the difference in the height of the protrusions exceeds 4.0 mm, it is difficult to sufficiently secure the block strength of the low block 23L, and it is difficult to sufficiently improve the cut resistance.
- the area of one top surface of the high block 23H or the low block 23L included in the block pair B is preferably 30% to 70% of the area of the other top surface. Providing an area difference (difference in block volume) between the high block 23H and the low block 23L in this way complicates the unevenness of the side block 23, which is advantageous for improving running performance on unpaved roads. .
- the high block 23H is relatively large, and the area of the top surface of the low block 23L included in the block pair B is preferably 30% to 70% of the area of the top surface of the high block 23H.
- the block having the relatively small top surface becomes less than 30% of the area of the other top surface, the block having the relatively small top surface becomes too small and the block strength is reduced. It becomes difficult to sufficiently improve the cut property. If the area of a block having a relatively small top surface exceeds 70% of the area of the other top surface, the area difference becomes small, and blocks having the same top surface area are arranged in the circumferential direction. However, the unevenness of the side blocks 23 cannot be sufficiently complicated, and the effect of improving the running performance on unpaved roads is limited.
- the total area of the high block 23H with respect to the area of the side region between the boundary and the innermost end of the side block in the tire radial direction is preferably 32% to 52%, and The total area of the blocks 23L is preferably 13% to 33%, and the total area of the side grooves 33 is preferably 25% to 45%.
- the total area of the high blocks 23H and the low blocks 23L is the total area of the top surfaces of the blocks, and the total area of the side grooves 33 is the total area of the bottom surfaces of the grooves. If the area of each element is out of the above range, the balance of each element in the side region will be lost, and it will be difficult to achieve a good balance between traveling performance and cut resistance on an unpaved road in a well-balanced manner.
- the side block 23 is disposed in an appropriate region in the tire radial direction so that when the tire is buried in mud or the like when traveling on an unpaved road, the tire appropriately contacts the road surface.
- the innermost end in the tire radial direction of the side block 23 exists in the range of preferably 30% to 60% of the tire sectional height SH from the position of the tire equator CL toward the inner side in the tire radial direction.
- the distance D from the tire equator CL position to the radially innermost end of the side block 23 is preferably 30% to 60% of the tire section height SH.
- the side blocks 23 By arranging the side blocks 23 in an appropriate range in the tire radial direction of the sidewall portion 2 in this manner, it is possible to effectively improve the traveling performance on an unpaved road. Further, since the size of the side block 23 can be appropriately secured, it is advantageous to secure the block rigidity and improve the cut resistance. If the distance D is less than 30% of the tire cross-section height SH, the side blocks 23 become small, and it becomes difficult to maintain good cut resistance. If the distance D exceeds 60% of the tire cross-section height SH, the side blocks 23 become too large, which may affect normal running performance.
- the boundary between the shoulder region and the side region is determined by the tire cross-section height SH of 20 from the tire equator CL position inward in the tire radial direction regardless of the presence or absence of the ridge 24. %.
- one of the pair of shoulder blocks 21 located inside the block pair B in the tire width direction is processed into a concave shape at an edge portion on the outer side in the tire width direction of the other block, and is processed in the tire width direction of the other block.
- the narrow groove 42 is provided on the outer side surface of the shoulder block 21 in the tire width direction as in the illustrated example, it is preferable to provide the narrow groove 42 also on the top surface of the side block 23.
- the narrow groove 42 provided in the side block 23 may extend inward in the tire radial direction from the position of the tire radial inner end of the narrow groove 42 provided on the outer side surface of the shoulder block 21 in the tire width direction.
- the narrow groove 42 provided in the side block 23 may extend in the same direction at an angle difference of 15 ° or less with respect to the first straight portion L1. This makes it possible to add the earth discharging property and the edge effect by the narrow groove 42, which is advantageous for improving the running performance on an unpaved road.
- a linear convex portion 50 having a width of, for example, 0.5 mm to 2.0 mm and a protruding height from the block top surface of, for example, 0.5 mm to 1.5 mm can be provided.
- a linear protrusion 50 extending along the outline of each side block 23 within a range of 5 mm to 20 mm from the outline, and one end connected to the narrow groove 42, And a linear convex portion 50 extending so as to pass through an intermediate position between a pair of contour lines on both sides in the tire circumferential direction of the side block 23 at the center position in the tire circumferential direction. Since such a linear projection 50 also functions as an edge component, it is advantageous for improving running performance on an unpaved road.
- the above-described side block 23 exhibits the above-described effects if provided in at least one side region (the right side region in the illustrated example) of the side regions on both sides in the tire width direction. Can be. Needless to say, the above-described side blocks 23 can be applied to both side regions on both sides in the tire width direction. In addition, as shown in FIG. 2, while the above-described side block 23 is applied to one side region, by adopting a different shape to the other side region, one side region and the other side in the tire width direction are used. The side regions can also be specialized for different performances.
- the tire size is LT265 / 70R17 121Q, has the basic structure illustrated in FIG. 1, and is based on the tread pattern of FIG. 2.
- the ratio of the area of the top surface of the block having the relatively small top surface area to the block having the relatively large top surface area, relative to the area of the side region The ratio of the total area of each of the block, the low block, and the side groove, and the ratio (D / SH ⁇ 100%) of the distance D from the tire equator CL position to the tire radially innermost end
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Abstract
Description
各試験タイヤをリムサイズ17×8Jのホイールに組み付けて、空気圧を350kPaとして試験車両(四輪駆動のSUV)に装着し、未舗装路(グラベル路面)からなる試験路にて発進性についてテストドライバーによる官能評価を行った。評価結果は、比較例1の値を100とする指数にて示した。この指数値が大きいほど未舗装路における発進性が優れることを意味する。尚、指数値が「105」未満では、従来レベル(基準とした比較例1)との差が小さく、未舗装路における発進性を向上する効果が充分に得られなかったことを意味する。
各試験タイヤをリムサイズ17×8Jのホイールに組み付けて、空気圧を350kPaとして試験車両(四輪駆動のSUV)に装着し、オフロード耐久路にて1000km走行した後に、サイド部に生じたカットの総長さを測定した。評価結果は、比較例1の測定値の逆数を100とする指数にて示した。この指数値が大きいほどカットの総長さが小さく、耐カット性に優れることを意味する。尚、指数値が「105」未満では、従来レベル(基準とした比較例1)との差が小さく、耐カット性を向上する効果が充分に得られなかったことを意味する。
2 サイドウォール部
3 ビード部
4 カーカス層
5 ビードコア
6 ビードフィラー
7 ベルト層
8 ベルト補強層
10 主溝
20 ブロック
21 ショルダーブロック
21a 抉れ部
22 センターブロック
23 サイドブロック
24 突条
31 ショルダーラグ溝
32a センターラグ溝
32b 補助溝
33 サイド溝
41 サイプ
42 細溝
50 線状凸部
B ブロック対
L1 第一直線部
L2 第二直線部
L3 第三直線部
CL タイヤ赤道
E 接地端
Claims (8)
- タイヤ周方向に延在して環状をなすトレッド部と、該トレッド部の両側に配置された一対のサイドウォール部と、これらサイドウォール部のタイヤ径方向内側に配置された一対のビード部とを備えた空気入りタイヤにおいて、
前記トレッド部と前記サイドウォール部との境界のタイヤ径方向内側に隣接するサイド領域に、タイヤ径方向に沿って延在する複数本のサイド溝と、前記サイド溝に区画されて前記サイドウォール部の外表面から隆起する複数のサイドブロックとが設けられ、
前記サイドブロックは、隆起高さが相対的に大きい高ブロックと隆起高さが相対的に小さい低ブロックとの2種類のブロックを含み、これら高ブロックおよび低ブロックはタイヤ周方向に交互に配列され、タイヤ周方向に隣り合う前記高ブロックおよび前記低ブロックをブロック対としたとき、前記ブロック対に含まれる前記高ブロックおよび前記低ブロックの一部が接することで前記ブロック対に含まれる前記高ブロックおよび前記低ブロックの間に位置するサイド溝のタイヤ径方向内側端は閉塞しており、
各ブロック対において、前記高ブロックの頂面のタイヤ周方向両側の縁部を構成する一対の輪郭線と前記低ブロックの頂面のタイヤ周方向両側の縁部を構成する一対の輪郭線とは、それぞれ3本以上の直線部がタイヤ径方向に連結して構成されており、各輪郭線の前記境界から1番目に位置する直線部を第一直線部、2番目に位置する直線部を第二直線部、3番目に位置する直線部を第三直線部としたとき、前記第一直線部どうしが互いに15°以内の角度差で同方向に延在し、前記第二直線部どうしまたは前記第三直線部どうしのいずれか一方が互いに15°以内の角度差で同方向に延在し、前記第二直線部どうしまたは前記第三直線部どうしの他方に15°を超える角度差で異なる方向に延在する直線部が含まれることを特徴とする空気入りタイヤ。 - 前記ブロック対に含まれる前記高ブロックまたは前記低ブロックの少なくとも一方において前記高ブロックまたは前記低ブロックの他方側に位置する第三直線部が前記高ブロックまたは前記低ブロックの他方に向かって延在する請求項1に記載の空気入りタイヤ。
- 前記ブロック対に含まれる前記高ブロックと前記低ブロックとの隆起高さの差が0.5mm以上4.0mm以下であることを特徴とする請求項1または2に記載の空気入りタイヤ。
- 前記ブロック対に含まれる前記高ブロックまたは前記低ブロックの一方の頂面の面積が他方の頂面の面積の30%~70%であることを特徴とする請求項1~3のいずれかに記載の空気入りタイヤ。
- 前記ブロック対に含まれる前記低ブロックの頂面の面積が前記高ブロックの頂面の面積の30%~70%であることを特徴とする請求項4に記載の空気入りタイヤ。
- 前記境界のタイヤ幅方向内側に隣接するショルダー領域に、タイヤ周方向に沿って配列された複数のショルダーブロックと、タイヤ周方向に隣り合う前記ショルダーブロックの間でタイヤ幅方向に沿って延在するショルダーラグ溝とが設けられ、前記サイド溝が前記ショルダーラグ溝の延長位置に配置されたことを特徴とする請求項1~5のいずれかに記載の空気入りタイヤ。
- 前記サイドブロックのタイヤ径方向最内側端がタイヤ赤道位置からタイヤ径方向内側に向かってタイヤ断面高さの30%~60%の範囲に存在することを特徴とする請求項1~6のいずれかに記載の空気入りタイヤ。
- 前記境界と前記サイドブロックのタイヤ径方向最内側端との間のサイド領域の面積に対する前記高ブロックの総面積が32%~52%であり、前記低ブロックの総面積が13%~33%であり、前記サイド溝の総面積が25%~45%であることを特徴とする請求項1~7のいずれかに記載の空気入りタイヤ。
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EP4169741A1 (en) * | 2021-10-22 | 2023-04-26 | Toyo Tire Corporation | Tire |
JP7508338B2 (ja) | 2020-10-30 | 2024-07-01 | Toyo Tire株式会社 | 空気入りタイヤ |
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JP6702361B2 (ja) * | 2018-07-02 | 2020-06-03 | 横浜ゴム株式会社 | 空気入りタイヤ |
JP7550020B2 (ja) | 2020-10-30 | 2024-09-12 | Toyo Tire株式会社 | 空気入りタイヤ |
JP2023054637A (ja) | 2021-10-04 | 2023-04-14 | 住友ゴム工業株式会社 | 空気入りタイヤ |
JP2023054401A (ja) * | 2021-10-04 | 2023-04-14 | Toyo Tire株式会社 | タイヤ |
JP2023119951A (ja) * | 2022-02-17 | 2023-08-29 | 住友ゴム工業株式会社 | 空気入りタイヤ |
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