WO2022264590A1 - タイヤ - Google Patents
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- Publication number
- WO2022264590A1 WO2022264590A1 PCT/JP2022/013110 JP2022013110W WO2022264590A1 WO 2022264590 A1 WO2022264590 A1 WO 2022264590A1 JP 2022013110 W JP2022013110 W JP 2022013110W WO 2022264590 A1 WO2022264590 A1 WO 2022264590A1
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- WIPO (PCT)
- Prior art keywords
- block
- tire
- circumferential
- blocks
- width direction
- Prior art date
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- 230000004048 modification Effects 0.000 description 27
- 238000012986 modification Methods 0.000 description 27
- 238000005452 bending Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/0306—Patterns comprising block rows or discontinuous ribs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/11—Tread patterns in which the raised area of the pattern consists only of isolated elements, e.g. blocks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
- B60C11/1236—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
Definitions
- the present invention relates to a tire using a tread pattern in which blocks with a relatively small contact area are densely arranged.
- the tread pattern in which small blocks are densely arranged like this, has better contact with ice and snow roads than regular sized blocks, improving driving performance on snow and ice roads (henceforth referred to as performance on ice). can.
- An object of the present invention is to provide a tire that can further improve braking performance on snowy and icy roads when traveling straight ahead when using a tread pattern in which blocks with a relatively small contact area are densely arranged.
- a tire according to an embodiment of the present invention includes block groups partitioned by a pair of circumferential grooves extending in the tire circumferential direction.
- the block group includes a plurality of blocks partitioned by a plurality of width direction grooves extending in the tire width direction.
- Each of the plurality of blocks is partitioned into a plurality of small blocks by circumferential sipes extending in the tire circumferential direction and widthwise sipes extending in the tire width direction.
- the circumferential sipes extend in a zigzag manner, and at least the outermost widthwise sipes in the tire circumferential direction of the plurality of widthwise sipes extend parallel to each other.
- each block included in the block group is divided into small blocks by zigzag-shaped circumferential sipes and a plurality of widthwise sipes.
- each small block supports not only the small blocks adjacent in the tire circumferential direction but also the small blocks adjacent in the tire width direction during braking, so that the bending rigidity of each block in the tire circumferential direction increases. By increasing the bending rigidity in this manner, the ground contact of the tire during braking is improved.
- FIG. 1 is a partial plan development view of the tread of a pneumatic tire 10.
- FIG. FIG. 2 is a partially enlarged plan view of the tread 20.
- FIG. FIG. 3 is a partial cross-sectional view of the block 100 including the circumferential sipe 120 (widthwise sipe 130) along the sipe width direction and the tire radial direction TR.
- 4 is a partial plan development view of the tread of the pneumatic tire 10A according to Modification 1.
- FIG. FIG. 5 is a partial plan development view of the tread of a pneumatic tire 10B according to Modification 2.
- FIG. 6 is a partial plan development view of the tread of a pneumatic tire 10C according to Modification 3.
- FIG. 7 is a partial plan development view of the tread of a pneumatic tire 10D according to Modification 4.
- FIG. 8 is a partial plan development view of the tread of a pneumatic tire 10E according to Modification 5.
- FIG. 1 is a partial plan development view of the tread of a pneumatic tire 10.
- FIG. 1 is a partial plan development view of the tread of a pneumatic tire 10 according to one embodiment.
- the pneumatic tire 10 of the embodiment is a so-called winter tire that can run on icy and snowy road surfaces, specifically icy and snowy road surfaces, and is also called a studless tire. Further, the pneumatic tire 10 may be an all-season tire capable of running on non-icy and snowy road surfaces (wet and dry road surfaces) and on ice and snowy road surfaces. Alternatively, the pneumatic tire 10 may be a general summer tire rather than a winter tire or an all-season tire.
- the type of vehicle to which the pneumatic tire 10 is mounted is not particularly limited, but may be mainly intended for passenger cars (SUVs and minivans may be included).
- the pneumatic tire 10 uses a tread pattern in which blocks with a relatively small contact area are densely arranged.
- the pneumatic tire 10 includes block rows 31, 32, 33, 34, and 35 extending in the tire circumferential direction TC, as shown in FIG.
- the pneumatic tire 10 includes block rows 31, 32, 33 that are partitioned by adjacent pairs of circumferential grooves 41, 42, 43, and 44, and block rows 31, 32, and 33 that are adjacent to each other. It has block rows 34, 35 defined by directional grooves 43, 44 and tread edges.
- the tread 20 is the part that contacts the road surface.
- a tread pattern is formed on the tread 20 according to the usage environment of the pneumatic tire 10 and the type of vehicle on which the pneumatic tire 10 is mounted.
- a block row 31 is provided on the tread 20 at a position including the tire equator line CL, and a block row 32 and a block row 33 are provided outside the block row 31 in the tire width direction.
- a block row 34 is provided outside the block row 32 in the tire width direction, and a block row 35 is provided outside the block row 33 in the tire width direction.
- the block row 31 is defined by a pair of circumferential grooves extending in the tire circumferential direction TC, specifically, a circumferential groove 41 and a circumferential groove 42 .
- the block row 32 is partitioned by a circumferential groove 42 and a circumferential groove 43.
- the block rows 33 are partitioned by circumferential grooves 41 and 44 . Since the block row 34 and the block row 35 are provided in the shoulder region of the tread 20, no circumferential grooves are formed on the outside in the tire width direction.
- FIG. 2 is a partially enlarged plan view of the tread 20 .
- the tread 20 is provided with a plurality of block rows extending in the tire circumferential direction TC, and each block row includes a plurality of blocks in contact with the road surface.
- the block row includes a plurality of blocks partitioned by a plurality of width direction grooves extending in the tire width direction WD.
- block column 31 includes block 100 .
- Block column 32 includes blocks 200 .
- Block column 33 includes blocks 300 .
- Block column 34 includes blocks 400 .
- Block column 35 includes blocks 500 .
- the block 100 is partitioned by widthwise grooves 61 .
- Blocks 200 are defined by widthwise grooves 62 .
- Blocks 300 are defined by widthwise grooves 63 .
- Blocks 400 are defined by widthwise grooves 64 .
- Blocks 500 are defined by widthwise grooves 65 .
- the widths in the tire circumferential direction TC of the blocks 100 included in the block row 31 may not all be the same width.
- the blocks 100 defined by the width direction grooves 61 extending parallel to each other are alternately arranged with blocks 1001 having a wide width in the tire circumferential direction and blocks 1003 having a narrow width in the tire circumferential direction.
- the block row 32 and the block row 33 have roughly the same shape as the block row 31.
- the blocks 200 partitioned by the width direction grooves 62 alternately have blocks with a wide width in the tire circumferential direction and blocks with a narrow width in the circumferential direction. are placed.
- the blocks 300 partitioned by the width direction grooves 63 are alternately arranged in the tire circumferential direction, with blocks having a wide width in the circumferential direction and blocks having a narrow width in the circumferential direction.
- the block 100 is partitioned into a plurality of small blocks 101 by circumferential sipes 120 extending in the tire circumferential direction TC and widthwise sipes 130 extending in the tire width direction WD.
- the block 100 is partitioned into nine small blocks 101 by two circumferential sipes 120 and two widthwise sipes 130 .
- each end of the width direction sipe 130 communicates with one of the circumferential grooves. Specifically, the ends of the widthwise sipes 130 communicate with the circumferential grooves 41 and 42 .
- the circumferential sipes 120 extend in a zigzag shape. Both ends of the circumferential sipe 120 communicate with the widthwise grooves 61 adjacent to the block 100 .
- the widthwise grooves 61 and the widthwise sipes 130 are inclined with respect to the tire width direction WD.
- the widthwise grooves 61 and the widthwise sipes 130 are parallel in a tread plan view. That is, the inclination angle of the width direction grooves 61 with respect to the tire width direction WD and the inclination angle of the width direction sipes 130 with respect to the tire width direction WD are the same.
- the width direction sipe 130 and the circumferential sipe 120 intersect at a portion where the zigzag-shaped circumferential sipe 120 is bent.
- each small block 101 partitioned by the circumferential sipe 120 and the widthwise sipe 130 in a tread plan view may be a polygon surrounded by at least four sides.
- the small block 101 is rectangular.
- the tire circumferential direction TC of the small block 101 is partitioned by a plurality of widthwise sipes 130 parallel to each other or widthwise grooves 61 formed parallel to the widthwise sipes 130 .
- the tire width direction WD of the small block 101 is partitioned by mutually parallel circumferential sipes 120 or circumferential grooves 41 and 42 . Therefore, the small blocks 101 adjacent to the circumferential grooves 41 and 42 have a trapezoidal columnar shape in the tread plan view. It has a columnar shape.
- At least blocks 200 and 300 have substantially the same shape as block 100 .
- the block 200 is partitioned into nine small blocks 201 by two circumferential sipes 220 and two widthwise sipes 230 .
- the ends of the widthwise sipes 230 communicate with the circumferential grooves 42 and 43 .
- the circumferential sipe 120 extends in a zigzag shape. Both ends of the circumferential sipe 220 communicate with the widthwise groove 62 adjacent to the block 200 without directly communicating with the circumferential grooves 42 and 43 adjacent to the block 200 .
- widthwise grooves 62 and the widthwise sipes 230 are inclined with respect to the tire width direction WD.
- the widthwise grooves 62 and the widthwise sipes 230 are parallel in a tread plan view.
- the width direction sipe 230 and the circumferential sipe 220 intersect at a portion where the zigzag-shaped circumferential sipe 220 is bent.
- the block 300 is partitioned into nine small blocks 301 by two circumferential sipes 320 and two widthwise sipes 330 .
- the end of the width direction sipe 330 communicates with the circumferential grooves 41 and 44 .
- the circumferential sipe 120 extends in a zigzag shape. Both ends of the circumferential sipe 320 communicate with the widthwise groove 63 adjacent to the block 300 without directly communicating with the circumferential grooves 41 and 44 adjacent to the block 200 .
- widthwise grooves 63 and the widthwise sipes 330 are inclined in the opposite direction of the widthwise grooves 61 and the widthwise sipes 130 with respect to the tire width direction WD. Furthermore, the widthwise grooves 63 and the widthwise sipes 330 are parallel in a tread plan view.
- the width direction sipe 330 and the circumferential sipe 320 intersect at a portion where the zigzag-shaped circumferential sipe 320 is bent.
- a block row 31 including parallelogram blocks 100 having square columnar small blocks 101 and a parallelogram block 200 having square columnar small blocks 201 are arranged.
- a block row 33 including parallelogram-shaped blocks 300 having square columnar small blocks 301 are a pair of outermost peripheral blocks in the tire width direction arranged across the tire equator line CL. It is provided only in the center portion CT defined by the directional grooves 43 and 44 .
- the block 400 is partitioned into six small blocks 401 by one circumferential sipe 420 and two widthwise sipes 430 .
- the inner end in the tire width direction of the width direction sipe 430 communicates with the circumferential groove 43 .
- the ends of the circumferential sipes 420 communicate with the widthwise grooves 64 formed adjacent to the block 400 .
- a circumferential sipe 420 formed in the block 400 including the tread edge extends linearly along the tire circumferential direction TC. Moreover, the width direction sipe 430 arranged in the block 400 is bent at the intersection with the circumferential direction sipe 420 .
- widthwise grooves 64 and the widthwise sipes 430 are inclined with respect to the tire width direction WD. As shown in FIG. 1 , portions of the widthwise grooves 64 and the widthwise sipes 430 on the circumferential groove 43 side may be more inclined than other portions.
- the block 500 is also partitioned into six small blocks 501 by one circumferential sipe 520 and two widthwise sipes 530 .
- the inner end in the tire width direction of the width direction sipe 530 communicates with the circumferential groove 44 .
- the end of the circumferential sipe 520 communicates with the widthwise groove 65 formed adjacent to the block 500 .
- a circumferential sipe 520 formed in the block 500 including the tread edge extends linearly along the tire circumferential direction TC. Moreover, the width direction sipe 530 arranged in the block 400 is bent at the intersection with the circumferential direction sipe 520 .
- widthwise grooves 65 and the widthwise sipes 530 are inclined with respect to the tire width direction WD. As shown in FIG. 2 , portions of the widthwise grooves 65 and the widthwise sipes 530 on the circumferential groove 43 side may be more inclined than the other portions.
- the blocks 400 and 500 have point-symmetrical shapes.
- FIG. 3 is a partial cross-sectional view of the block 100 including the circumferential sipe 120 or the width sipe 130 along the sipe width direction and the tire radial direction TR.
- At least the circumferential sipes 220 , 320 formed in the blocks 200 , 300 have the same cross-sectional shape as the circumferential sipes 120 formed in the block 100 .
- the widthwise sipes 230 and 330 also have a cross-sectional shape similar to that of the widthwise sipe 130 .
- the circumferential sipe 120 has a constant groove width GW1 from the road surface side to the bottom portion.
- the width direction sipe 130 also has a constant groove width GW1 from the road surface side to the bottom portion.
- the cross-sectional shape of the circumferential sipe 120 and the widthwise sipe 130 along the sipe width direction and the tire radial direction TR is such that the sipe wall surfaces extend linearly along the tire radial direction TR and are substantially parallel to each other. groove wall surface.
- a sipe is a narrow groove that closes on the ground surface of the block.
- the opening width of the sipe when not grounded is not particularly limited, but is preferably 0.1 mm to 1.5 mm, more preferably 0.4 mm to 0.7 mm.
- the depth D1 of the circumferential sipe 120 and the widthwise sipe 130 is set to about 5.0 mm, and the groove width GW1 is set to about 0.4 mm.
- Block Dimensions and Bending Rigidity As described above, since the blocks 200 and 300 generally have the same shape as the block 100, the block dimensions and bending rigidity of the block 100 shown in FIG. An example will be explained.
- the dimension W1 of the block 100 along the tire width direction WD is longer than the dimension L1 of the block 100 along the tire circumferential direction TC. That is, the block 100 is horizontally long.
- the ratio W2/W1 between the width W2 of the small block 101 in the tire width direction and the width W1 of the block 100 in the tire width direction is 0.25 or more and 0.50 or less.
- W2/W1 is more preferably 0.30 or more and 0.45 or less.
- a ratio L2/L1 between the length L2 of the small block 101 in the tire circumferential direction TC and the length L1 of the block 100 in the tire circumferential direction TC is 0.1 to 0.5, preferably 0.15 to 0. 0.45 or less is preferred.
- L2/L1 is preferably smaller than W2/W1.
- the width W1, the width W2, the length L1, and the length L2 are based on the tire width direction WD and the tire circumferential direction TC, as shown in FIG.
- the width W2 of the small block 101 is the distance from the end of the small block 101 in the tire width direction to the center of the zigzag shape of the circumferential sipe 120 in the tire width direction, or the two circumferential sipes 120 adjacent to the small block 101. may be based on the distance between the centers of
- the height of the block 100 that is, the depth of the circumferential grooves 41, 42 and the widthwise groove 61 that divide the block 100 may not be constant, but is about 6 mm to 12 mm.
- the secondary moment of area of the single small block 101 with respect to the height direction is 150 (mm 4 ) or more and 2200 (mm 4 ) or less.
- the moment of inertia of area is preferably 300 to 1500 (mm 4 ), more preferably 500 to 1000 (mm 4 ).
- the shape of the tread plan view of the small blocks 101 adjacent to the circumferential grooves 41 and 42 is a trapezoidal columnar shape, and the geometrical moment of inertia is determined by (Equation 1).
- the shape of the tread of the small blocks 101, both ends of which are partitioned by the circumferential sipes 120, in plan view is a parallelogram columnar shape, and the geometrical moment of inertia is obtained by (Equation 2).
- a block 100 (as well as other blocks) is partitioned into a plurality of small blocks 101 by circumferential sipes 120 and widthwise sipes 130 .
- Circumferential sipe 120 and widthwise sipe 130 have a constant groove width GW1 from the tread side to the bottom portion.
- the circumferential sipe 120 and the width direction sipe 130 each having a constant groove width GW1 extend to the bottom portion. It is possible to secure the edge pressure at the end in the direction WD.
- the block edge portion of the block 100 is divided (partitioned) by the circumferential sipe 120, water removal performance from the tread surface of the block 100 can be ensured.
- the small block 101 forming the end portion of the block 100 in the tire circumferential direction TC also secures a sufficient edge pressure as described above, the catching on the icy and snowy road surface is particularly strong, and the braking/driving performance is improved. can be effectively enhanced. Further, the other small blocks 101 provided behind the small blocks 101 forming the ends of the blocks 100 in the tire circumferential direction TC can firmly contact the road surface.
- each small block 101 has “groundability”, “edge effect” and “water removal (drainage)” as described above. It shares the roles of “edge effect” and “water removal (drainage)”.
- the size ratio W2/W1 between the small block 101 and the block 100 is 0.25 or more and 0.50 or less, and the geometrical moment of inertia with respect to the height direction of the single block 100 is , 150 (mm 4 ) or more and 2200 (mm 4 ) or less.
- the dynamic performance such as braking/driving performance and steering stability can be improved not only on ice and snow road surfaces but also on dry road surfaces. can be enhanced. That is, according to the pneumatic tire 10, when using a tread pattern in which blocks with a relatively small contact area are densely arranged, it is possible to exhibit even higher exercise performance.
- the small block 101 (other blocks and small blocks are generally the same) has a quadrangular columnar shape when viewed from the top of the tread. Therefore, the adjacent small blocks 101 can efficiently support each other through the circumferential sipes 120 and the widthwise sipes 130 .
- the braking performance on snowy and icy roads during straight driving is such that each small block 101 supports not only the small blocks 101 adjacent in the tire circumferential direction TC but also the small blocks 101 adjacent in the tire width direction WD during braking.
- This configuration increases the bending rigidity of each block 100 in the tire circumferential direction TC. By increasing the flexural rigidity in the tire circumferential direction TC in this manner, the tire's road-hugging property during braking can be further improved.
- the ends of the widthwise sipes 130 communicate with the circumferential grooves 41 and 42
- the ends of the circumferential sipes 120 communicate with the widthwise grooves 61 formed adjacent to the block 100 . communicate.
- sufficient water removal performance can be exhibited while securing the rigidity (block rigidity) of the block 100 .
- the width W2 of the block 100 is greater than the length L2 of the block 100, and the block 100 is horizontally long.
- the edge effect (which may also be referred to as an edge component) by the end portion of the block 100 in the tire circumferential direction TC can be enhanced, and the braking performance, which is particularly important on icy and snowy road surfaces, can be effectively enhanced.
- the widthwise grooves 61 and the widthwise sipes 130 are inclined with respect to the tire width direction WD, and the widthwise grooves 61 and the widthwise sipes 130 are parallel. As a result, uneven wear of the block 100 and noise (pattern vibration noise) generated when the block 100 touches the road surface can be suppressed.
- the tread pattern of the pneumatic tire 10 described above may be changed as follows.
- 4 is a partial plan development view of the tread 20A of the pneumatic tire 10A according to Modification 1.
- FIG. 4 is a partial plan development view of the tread 20A of the pneumatic tire 10A according to Modification 1.
- FIG. 4 is a partial plan development view of the tread 20A of the pneumatic tire 10A according to Modification 1.
- the pneumatic tire 10A includes block rows 31A, 32A, and 33A, each of which is a block group.
- Block row 31A includes block 100A
- block row 32A includes block 200A
- block row 33A includes block 300A.
- the block 100A will be described below as an example. As shown in FIG. 4, the block 100A is partitioned into nine small blocks 101A by two circumferential sipes 120A and two widthwise sipes 130A.
- both ends of the block 100A in the tire width direction WD are formed in a zigzag shape parallel to the circumferential sipe 120A in the tread plan view.
- the small blocks 101A adjacent to the circumferential grooves 41A and 42A also have a parallelogram columnar shape when viewed from the top of the tread.
- the tread 20A since the widthwise ends of the block 100A are zigzag-shaped, the tread 20A has the circumferential grooves 41A and 42A that extend zigzag with this surface as the groove wall. Unlike the tread 20 of the embodiment that extends to the
- the block rows 31A, 32A, and 33A are formed by a pair of circumferential grooves 43A and 44A located on the outermost side in the tire width direction, which are arranged on both sides of the tire equator line CL. It is provided only in the center part CTA partitioned by .
- FIG. 5 is a partial plan development view of the tread 20B of the tire 10B according to Modification 2.
- FIG. 5 is a partial plan development view of the tread 20B of the tire 10B according to Modification 2.
- the pneumatic tire 10B includes block rows 31B, 32B, and 33B, each of which is a block group.
- Block column 31B includes block 100B
- block column 32B includes block 200B
- block column 33B includes block 300B.
- the block 100B will be described below as an example. As shown in FIG. 5, the block 100B is partitioned into seven small blocks 101B by two circumferential sipes 120B and four widthwise sipes 130B.
- the modification 2 differs in that the small blocks 101B include hexagonal columnar (hexagonal in tread plan view) small blocks.
- the block 100B includes a circumferential sipe 120B that extends in a zigzag shape and communicates with adjacent widthwise grooves 61B at both ends, and a plurality of widthwise sipes that terminate at least one end within the block 100B. It is partitioned by sipe 130B. An end portion of the widthwise sipe 130B that terminates within the small block 101B communicates with the circumferential sipe 120B at a position where the circumferential sipe 120B is bent.
- both ends of the width direction sipe 130B are located at the nearest bending positions of the two circumferential sipes 120B in the tire width direction, or at the circumferential grooves 41B, 42B and the circumferential groove 41B of the circumferential sipe 120B. , 42B to the nearest bending position in the tire width direction, so that each small block 101B has a hexagonal prism shape.
- the tread 20B has circumferential grooves 41B and 42B extending in a zigzag shape. , different from the tread 20 of the embodiment.
- the block rows 31B, 32B, 33B are formed by a pair of circumferential grooves 43B, 44B located on the outermost side in the tire width direction, with the tire equator line CL interposed therebetween. It is provided only in the center part CTB partitioned by.
- each block supports two small blocks 101B adjacent to each other in the tire width direction WD during cornering.
- the bending rigidity in the tire width direction WD can also be increased.
- FIG. 6 is a partial plan development view of a tread 20C of a tire 10C according to Modification 3.
- FIG. 6 is a partial plan development view of a tread 20C of a tire 10C according to Modification 3.
- the pneumatic tire 10C includes block rows 31C, 32C, and 33C, each of which is a block group.
- Block column 31C includes block 100C
- block column 32C includes block 200C
- block column 33C includes block 300C.
- the block 100C will be described below as an example. As shown in FIG. 6, the block 100C is partitioned into eight small blocks 101C by two circumferential sipes 120C and five widthwise sipes 130C.
- the small block 101C in the modified example 3 is different in that the block width at both ends in the tire circumferential direction TC is wider than the block width at the central portion in the tread plan view. .
- each block 100C is formed in a parallelogram shape when the tread is viewed from above, as shown in FIG.
- the block 100C is partitioned by a circumferential sipe 120C that extends in a zigzag manner and communicates with adjacent widthwise grooves 61C at both ends, and a plurality of widthwise sipes 130C that terminate at least one end within the block 100C.
- An end portion of the widthwise sipe 130C that terminates within the small block 101C communicates with the circumferential sipe 120C at a position where the circumferential sipe 120C is bent.
- both ends of a widthwise sipe 130C that terminates in a block 100C communicate with the bent positions of the two circumferential sipes 120C that are furthest apart in the tire width direction.
- One end of a widthwise sipe 130C, which terminates in the block 100C at only one end, communicates with the circumferential grooves 41C, 42C, and the other end of the circumferential sipe 120C is bent furthest in the tire width direction from the circumferential grooves 41C, 42C. connected to the position.
- the blocks 100B of Modification 2 include hexagonal columnar small blocks 101B
- the blocks 100C of the block row 31C formed in the tread 20C of Modification 3 are arranged in the tire circumferential direction TC in a tread plan view. It includes a small block whose block width at both ends is wider than the block width at the center.
- the block rows 31C, 32C, and 33C are formed by a pair of circumferential grooves 43C and 44C positioned on the outermost side in the tire width direction and arranged across the tire equator line CL. provided only in the center portion CTC partitioned by .
- the secondary moment of area of the small block 101C with respect to the height direction is increased, suppressing the collapse of the small block 101C and improving the frictional force on ice. can.
- FIG. 7 is a partial plan development view of the tread 20D of the tire 10D according to Modification 4.
- FIG. 7 is a partial plan development view of the tread 20D of the tire 10D according to Modification 4.
- the pneumatic tire 10D includes a block group 31D over the entire center portion CT defined by a pair of circumferential grooves 41D and 42D arranged across the tire equator line CL.
- the block group 31D includes a plurality of width direction grooves 61D that are inclined with respect to the tire width direction WD and communicate with the circumferential grooves 41D but do not communicate with the circumferential grooves 42D, and a plurality of width direction grooves 61D that are opposite to the width direction grooves 61D with respect to the tire width direction WD. It includes a plurality of blocks 100D partitioned by a plurality of width direction grooves 62D that are inclined in the direction and communicate with the circumferential grooves 42D but do not communicate with the circumferential grooves 41D.
- blocks 100D that are not adjacent to circumferential grooves 41D and 42D are divided into seven small blocks 101B by four circumferential sipes 120D and four widthwise sipes 130B.
- a block 100D adjacent to the circumferential grooves 41D and 42D is divided into 12 small blocks 101B by four circumferential sipes 120D and seven widthwise sipes 130B.
- the block 100D extends in a zigzag shape so that both ends are adjacent to each other when not adjacent to the circumferential grooves 41D and 42D and when adjacent to the circumferential grooves 41D and 42D. It is partitioned by a circumferential sipe 120D communicating with the width direction groove 61D and a plurality of width direction sipes 130D having both ends terminated within the block 100D. Both ends of the widthwise sipe 130D that terminates within the small block 101D communicate with the circumferential sipe 120D at the bending positions of the circumferential sipe 120D.
- each small block 101D has a hexagonal prism shape by connecting both ends of the width direction sipe 130D to the nearest bending positions of the two circumferential sipes 120B in the tire width direction.
- a plurality of block groups (block rows 31, 32, 33) are arranged in the center portion CT.
- No. 4 tread 20D is different in that a single block group 31D is arranged over the entire center portion CT.
- the block row 31 is partitioned into a plurality of blocks 100 by the parallel width direction grooves 61 in that the block group 31D is partitioned into the plurality of blocks 100D by the width direction grooves 61D and 62D crossing each other. different from the block columns 31, 32, 33 of the present embodiment.
- each block supports two small blocks 101D adjacent to each other in the tire width direction WD during cornering.
- the bending rigidity in the tire width direction WD can also be increased.
- the block group 31D is partitioned by a pair of circumferential grooves 41D and 42D located on the outermost side in the tire width direction and arranged across the tire equator line CL. It is provided only in the center part CTD.
- the block group 31D arranged in the center portion CT has a plurality of width direction grooves 61D and 62D that intersect each other. can do.
- FIG. 8 is a partial plan development view of the tread 20E of the pneumatic tire 10E according to Modification 5.
- FIG. 8 is a partial plan development view of the tread 20E of the pneumatic tire 10E according to Modification 5.
- the pneumatic tire 10E includes block rows 31E and 32E, each of which is a block group.
- Block column 31E includes block 100E
- block column 32E includes block 200E.
- a pneumatic tire 10E has a block row 33E instead of the block 300 included in the block row 33 of the pneumatic tire 10 of the embodiment, and a block parallel to the tire circumferential direction TC.
- a block 300E partitioned into a plurality of small blocks 301E by a circumferential sipe 320E extending in the direction of a good too.
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Abstract
Description
図1は、一実施形態に係る空気入りタイヤ10のトレッドの一部平面展開図である。
図2は、トレッド20に一部拡大平面図である。上述したように、トレッド20には、タイヤ周方向TCに延びる複数のブロック列が設けられ、当該ブロック列のそれぞれは、路面と接する複数のブロックを含む。
図3は、周方向サイプ120あるいは幅方向サイプ130を含むブロック100のサイプ幅方向及びタイヤ径方向TRに沿った一部断面図である。
上述したように、ブロック200,300が概ねブロック100と同様の形状を有するため、ここでは、ブロックの寸法及び曲げ剛性について、図2に図示されるブロック100を例に説明する。
ここで、図2に示すように、トレッド平面視で台形である小ブロック101の上底の長さをa、下底の長さをb、幅方向サイプ130に垂直な方向の高さをhとしている。
小ブロック101単体の長さL2と幅W2との関係は、1.0≦W2/L2≦1.5であることが好ましい。W2/L2を1.0以上とすることで接地性が向上して氷上性能が向上する。また、W2/L2を1.5以下とすることで、路面Rの表面に発生する水を除水することができ、氷上性能が向上する。
上述した実施形態によれば、以下の作用効果が得られる。具体的には、ブロック100(他のブロックも同様)は、周方向サイプ120と幅方向サイプ130とによって複数の小ブロック101に区画される。周方向サイプ120および幅方向サイプ130は、踏面側から底部分まで一定の溝幅GW1を有する。
以上、実施形態について説明したが、当該実施形態の記載に限定されるものではなく、種々の変形及び改良が可能であることは、当業者には自明である。
Claims (6)
- タイヤ周方向に延びる一対の周方向溝によって区画されたブロック群を備えるタイヤであって、
前記ブロック群は、タイヤ幅方向に延びる複数の幅方向溝によって区画された複数のブロックを含み、
前記複数のブロックの各ブロックは、タイヤ周方向に延びる周方向サイプとタイヤ幅方向に延びる複数の幅方向サイプとによって、複数の小ブロックに区画され、
前記複数のブロックの各ブロックでは、
前記周方向サイプが、ジグザグ状に延び、
前記複数の幅方向サイプのすくなくとも前記タイヤ周方向の最外側の幅方向サイプが互いに平行に延びるタイヤ。 - タイヤ赤道線を挟んで配置されたタイヤ幅方向で最も外側に位置する一対の周方向溝で区画されたセンター部のみに前記ブロック群を備える請求項1に記載のタイヤ。
- 前記周方向サイプは、踏面側から底部分まで一定の溝幅を有し、
前記複数の幅方向サイプのそれぞれは、踏面側から底部分まで一定の溝幅を有する請求項1または請求項2に記載のタイヤ。 - 前記複数の小ブロックの各小ブロックの形状が、トレッド平面視で少なくとも四つの辺で囲まれた多角形である請求項1~3の何れか一項に記載のタイヤ。
- 前記複数の小ブロックが、トレッド平面視で六角形の第一小ブロックを含む請求項4に記載のタイヤ。
- 前記複数の小ブロックが、トレッド平面視で前記タイヤ周方向の両端部におけるブロック幅が中央部におけるブロック幅より広い第二小ブロックを含む、請求項1~5の何れか一項に記載のタイヤ。
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