WO2023047722A1 - タイヤ - Google Patents
タイヤ Download PDFInfo
- Publication number
- WO2023047722A1 WO2023047722A1 PCT/JP2022/024414 JP2022024414W WO2023047722A1 WO 2023047722 A1 WO2023047722 A1 WO 2023047722A1 JP 2022024414 W JP2022024414 W JP 2022024414W WO 2023047722 A1 WO2023047722 A1 WO 2023047722A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tire
- groove
- shoulder
- width direction
- width
- Prior art date
Links
- 238000010586 diagram Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
Images
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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
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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 tires. This application claims priority based on Japanese Patent Application No. 2021-154870 filed in Japan on September 22, 2021, the entire contents of which are incorporated herein.
- Patent Document 1 a tire having a sipe in which the width of the bottom portion of the sipe is widened in order to suppress deterioration in drainage performance due to progress of wear of the tire.
- an object of the present invention is to provide a tire that has sufficient drainage even when wear of the tire progresses.
- the gist of the present invention is as follows.
- the tread surface has a plurality of circumferential main grooves extending in the tire circumferential direction, At least one shoulder groove is provided in a shoulder land portion defined by the circumferential main groove arranged on the outermost side in the tire width direction and the tread edge,
- the shoulder groove has, on the groove bottom side, a widened portion having a groove width larger than that on the tread surface side,
- the shoulder groove extends along the tire width direction on the tread surface, A tire, wherein a maximum width portion of the widened portion in the tire radial direction extends at an inclination angle of 25° or more with respect to the tire width direction in a plan view of the tread surface.
- FIG. 2 is a diagram schematically showing a contact patch of the tire according to the first embodiment of the present invention, viewed in the axial direction of the tire;
- FIG. 2 is a cross-sectional view taken along line AA of FIG. 1;
- FIG. 4 is a schematic perspective view for explaining the shape of a shoulder groove;
- FIG. 6 is a diagram schematically showing a ground contact surface of a tire according to a second embodiment of the present invention;
- the tire according to the invention can be used for any type of tire, preferably for passenger cars.
- any type of tire preferably for passenger cars.
- embodiments of the tire according to the present invention will be described by way of example with reference to the drawings. The same reference numerals are given to common components in each figure.
- FIG. 1 is a diagram schematically showing a contact patch of a tire 10 according to a first embodiment of the present invention, viewed in the axial direction of the tire. Note that in FIG. 1 , the grooves of the tread surface 1 in plan view when the wear of the tire progresses are also indicated by dotted lines. Further, in FIG. 1, the contour line of the contact surface of the tire when the wear progresses is schematically indicated by a dotted line C1.
- the term “tread surface (1)” refers to a tire that is mounted on a rim and has a predetermined internal pressure, and when the tire is rolled with the maximum load applied, it comes into contact with the road surface. , means the outer peripheral surface of the tire over its entire circumference.
- “tread edge (TE)” means an edge in the tire width direction of the tread surface (1).
- rim is an industrial standard valid for the region where tires are produced and used. Technical Organization) STANDARDS MANUAL, TRA (The Tire and Rim Association, Inc.) YEAR BOOK, etc.
- predetermined internal pressure refers to the air pressure (maximum air pressure) that corresponds to the maximum load capacity of a single wheel in the applicable size and ply rating described in the above JATMA YEAR BOOK, etc., and is described in the above industrial standards. For sizes without , it means the air pressure (maximum air pressure) corresponding to the maximum load capacity specified for each vehicle on which the tire is installed.
- Maximum load means the load corresponding to the maximum load capacity.
- the air referred to here can be replaced with an inert gas such as nitrogen gas.
- the dimensions of each element such as grooves and land portions, contact width (TW), etc. shall be measured under the “reference condition” described later.
- the term “reference state” refers to a state in which the tire is mounted on a rim, filled with the above predetermined internal pressure, and placed in an unloaded state.
- the "groove width” is the distance between a pair of groove wall surfaces facing each other when measured perpendicularly to the extending direction of the groove.
- the term “groove depth” refers to the distance in the direction perpendicular to the tread surface from the tread surface to the groove bottom position in a cross section along the groove width direction.
- ground contact surface refers to the outer peripheral surface of the tire that comes into contact with the road surface when the tire mounted on the rim and filled with a predetermined internal pressure is placed on the ground with the maximum load applied.
- tire circumferential direction is also referred to as “tire circumferential direction CD1” or “tire circumferential direction CD2”
- tire width direction is also referred to as “tire width direction WD”.
- CD tire circumferential direction
- WD tire width direction
- the tire 10 according to the first embodiment of the present invention has a plurality of circumferential main grooves 2 extending in the tire circumferential direction on the tread surface.
- a pair of circumferential main grooves 2a arranged on the outermost side in the tire width direction and a circumferential main groove 2b extending along the tire equatorial plane CL are arranged.
- the number of circumferential main grooves 2 is three, but may be two or four or more.
- both the circumferential main grooves 2a and 2b extend without being inclined with respect to the tire circumferential direction. 2 may extend at an angle of 5° or less with respect to the tire circumferential direction. In addition, each circumferential main groove 2 may extend linearly along the tire circumferential direction, as shown in FIG.
- the groove width of the circumferential main grooves 2a and 2b is not particularly limited, but from the viewpoint of drainage performance and steering stability, for example, when the tire is mounted on the rim, filled with a predetermined internal pressure, and the maximum load is applied, It is preferable that the pair of groove wall surfaces facing each other are configured so as not to come into contact with each other when the load is directly applied. More specifically, it is preferable to set the groove width in the reference state to more than 1.5 mm. Also, the groove depth of the circumferential main grooves 2a and 2b is not particularly limited, but from the viewpoint of sufficient drainage and maintenance of tire rigidity, the groove depth is preferably 3 mm or more and 20 mm or less, for example.
- shoulder land portions 3a and 3b are defined by a pair of circumferential main grooves 2a arranged on the outermost side in the tire width direction and tread edges TE.
- Center land portions 3c and 3d are defined by 2b and a pair of circumferential main grooves 2a.
- the shoulder land portions 3a and 3b and the center land portions 3c and 3d are rib-like land portions that are not divided in the tire circumferential direction, but are blocks divided by the width direction grooves. It can also be a land part.
- the center land portions 3c and 3d do not have grooves or the like extending in the tire width direction, but grooves or the like extending in the tire width direction may be provided as appropriate.
- At least one shoulder groove 4 is provided in each of the shoulder land portions 3a and 3b.
- two shoulder grooves 4 are provided on each of the shoulder land portions 3a and 3b on the ground contact surface, but the number and arrangement of the shoulder grooves 4 are not particularly limited.
- the shoulder groove 4 may be provided only in one of the shoulder land portions 3a and 3b.
- FIGS. 1, 2 and 3 are cross-sectional views taken along line AA in FIG. 1, and FIG. 3 is a schematic perspective view for explaining the shape of the shoulder groove.
- the shoulder grooves 4 extend along the tire width direction WD on the tread surface 1 .
- “extending along the tire width direction” means that the shoulder grooves 4 are parallel to the tire width direction WD in a plan view of the tire, or that the shoulder grooves 4 are inclined at 5° or less with respect to the tire width direction. It means that it extends at an angle.
- the shoulder grooves 4 may extend linearly in the tire width direction as shown in FIG. 1, or may extend in a zigzag or wavy shape in the tire width direction.
- the term “zigzag in the tire width direction” means that each of the linear portions forming the zigzag extends along the tire width direction.
- the shoulder groove 4 opens at the tread end TE of the shoulder land portion 3a, extends toward the circumferential main groove 2a, and terminates on the shoulder land portion 3a. is not limited to this, and for example, both the tread edge TE and the circumferential main groove 2a may be opened.
- the groove width of the shoulder groove 4 on the tread surface 1 is not particularly limited.
- the shoulder groove 4 has a widened portion whose groove width is larger than that of the groove bottom side tread surface 1 side.
- a second widened portion 4b having a groove width larger than that of the first widened portion 4a is provided on the groove bottom side of the first widened portion 4a, but the shapes of the first widened portions 4a and 4b are not particularly limited.
- the first widened portion 4a may have a shape in which the groove width increases stepwise from the tread surface 1 toward the second widened portion 4b.
- the groove width may increase stepwise from the tread surface 1 side to the groove bottom 43 side in a cross-sectional view, and may have a maximum width portion near the groove bottom 43 .
- the shape of the second widened portion 4b is also not particularly limited, and the second widened portion 4b may have a constant groove width from the side of the first widened portion 4a to the groove bottom 43, such as a rectangular cross-sectional shape. good too.
- the cross-sectional shape of the second widened portion 4b may be circular or elliptical, or a shape having a maximum width partway from the first widened portion 4a side to the groove bottom 43 side.
- the shoulder groove 4 may have an arcuate side wall and groove bottom having an arbitrary radius of curvature at the boundary between the groove wall 41 and the groove wall 42 and the groove bottom 43.
- 41 and 42 and the groove bottom 43 may each be linear in a cross section perpendicular to the extending direction of the groove.
- the shoulder grooves 4 extend along the tire width direction WD in the tread surface 1, as shown in FIG. 1, the maximum width portion Pw in the tire radial direction of the second widened portion 4b of the shoulder groove 4 has an inclination angle .theta.1 of 25.degree. (that is, it extends at an inclination angle of 25° or more with respect to the tire width direction WD).
- the maximum width portion (Pw) of the second widened portion 4b is a pair of groove wall surfaces facing each other when measured perpendicularly to the extending direction of the second widened portion 4b of the shoulder groove 4 in the standard state. It means the part where the interval between them is the maximum.
- the inclination angle ⁇ 1 of the maximum width portion Pw in plan view of the tread surface 1 is, as shown in FIG. 4 (the other end in the tire width direction in the example of FIG. 1) (in the example of FIG. 1, the groove width direction center of one end of the shoulder groove 4 and the groove of the other end of the shoulder groove 4 line segment connecting the center in the width direction) with respect to the tire width direction WD.
- the shoulder grooves 4 extend along the tire width direction WD on the tread surface 1 and continuously extend from the tread surface 1 toward the groove bottom side in the tire width direction WD. is changed so that the inclination angle ⁇ 1 becomes 25° or more.
- the shoulder groove 4 is not limited to such a configuration, and the portion from the tread surface 1 to the second widened portion 4b extends along the tire width direction WD, and the second widened portion 4b has a constant inclination angle ⁇ 1. It may be configured to extend.
- the shoulder groove 4 may be configured such that the angle changes stepwise from the tread surface 1 toward the groove bottom.
- the shoulder grooves 4 extending along the tire width direction WD on the tread tread surface 1 are arranged in the shoulder land portions 3a and 3b arranged on the outermost side in the tire width direction. can be ensured. Since the shoulder grooves 4 extend in the tire width direction WD, when the tire 10 travels straight, the shoulder grooves 4 make contact with the ground along the contour line on the stepping side of the ground contact surface. It is possible to suppress the occurrence of uneven wear and noise.
- the shoulder groove 4 has widened portions (first widened portion 4a and second widened portion 4b in the present embodiment) having a groove width larger than that of the tread tread surface 1 side on the groove bottom side, the wear of the tire is reduced. Sufficient drainage can be secured even at the time of development.
- the shoulder grooves 4 are inclined at an angle of 25° or more with respect to the tire width direction WD when tire wear progresses. When the wear of the tire progresses, the outer contour of the ground contact surface changes from the state before the wear progresses, as illustrated by the dotted line C1 in FIG.
- the shoulder grooves 4 extend along the width direction of the tire before the tire wear progresses, and the shoulder grooves 4 ( In this embodiment, the second widened portion 4b) extends at an angle of 25° or more with respect to the tire width direction.
- the drainage from the inner side in the width direction of the tire toward the tread end TE side is promoted.
- the shoulder grooves 4 in the shoulder land portion the drainage toward the tread edge TE is facilitated more easily than in the case of arranging it in the center land portion. can.
- the groove depth d1 of the shoulder grooves 4 is not particularly limited, but from the viewpoint of ensuring sufficient drainage and maintaining the rigidity of the tire, it is preferable to set it to approximately the same depth as the circumferential main grooves 2a and 2b. More specifically, the groove depth d1 is preferably 3 mm or more and 20 mm or less, for example. More preferably, it is 5 mm or more and 10 mm or less.
- the length d2 of the second widened portion 4b of the shoulder groove 4 in the groove depth direction is not particularly limited. from the viewpoint of maintaining the length d2 is preferably 30% or more and 70% or less of the depth d1 of the entire shoulder groove 4 . More preferably, the length d2 is 40% or more and 60% or less of the groove depth d1.
- the groove width w1 of the shoulder groove 4 on the tread surface 1 is not particularly limited, but from the viewpoint of effectively maintaining the rigidity of the tire when new, it is preferably less than 1.5 mm in the standard state. From the viewpoint of ensuring sufficient drainage performance of the shoulder groove 4, it is preferable to set it to 1 mm or more.
- the groove width w2 at the maximum width portion Pw of the second widened portion 4b of the shoulder groove 4 is also not particularly limited, but from the viewpoint of sufficient drainage when tire wear progresses, for example, the groove width w2 is set to 1.5 mm or more. From the viewpoint of maintaining sufficient rigidity of the land portion provided with the shoulder groove 4, for example, it is preferable to set the length to 4 mm or less. More preferably, the groove width w2 is set to 2.0 mm or more and less than 3.5 mm from the viewpoint of achieving both sufficient drainage performance and rigidity maintenance of the land portion when tire wear progresses.
- the extension length L1 of the shoulder groove 4 on the tread surface 1 is not particularly limited, it is preferably 25% or more of the contact width TW of the tire. By setting the extension length L1 to be 25% or more of the ground contact width TW of the tire, the water on the road surface can be sufficiently taken into the grooves, and sufficient drainage can be effectively ensured.
- the number of shoulder grooves 4 is not particularly limited, but from the viewpoint of ensuring sufficient drainage properties, it is preferable that two or more grooves are arranged in each of the shoulder land portions 3a and 3b in the tire's ground contact surface. More preferably, 3 to 10 grooves are preferably arranged in each of the shoulder land portions 3a and 3b within the ground contact surface from the viewpoint of ensuring sufficient drainage and rigidity of the land portion provided with the shoulder groove 4.
- “arranged within the ground plane” means that if even a part of the shoulder groove 4 is located within the ground plane, it is located within the ground plane.
- the inclination angle (angle on the acute angle side) ⁇ 1 of the maximum width portion Pw in the tire radial direction of the second widened portion 4b of the shoulder groove 4 with respect to the tire width direction WD in plan view of the tread surface 1 is 25° or more. Although not limited, it is preferably 50° or less in order to sufficiently maintain the traction performance of the tire in the circumferential direction while effectively ensuring sufficient water drainage. More preferably, the inclination angle ⁇ 1 of the second widened portion 4b is 28° or more and 45° or less.
- the rotation direction of the tire 10 is not particularly limited, in order to more effectively promote drainage from the inner end portion of the shoulder groove 4 in the tire width direction toward the tread end TE side, particularly when wear progresses, the tire circumference shown in FIG. It is preferable that the tire be mounted so that it rotates in the direction CD1, or that it is prescribed or recommended that the tire 10 be mounted so that it rotates in that direction.
- the maximum width portion Pw of the second widened portion 4b of the shoulder groove 4 moves from the inner side to the outer side in the tire width direction from the stepping side to the trailing side of the tire. It means to rotate the tire so that it is tilted.
- the second widened portion 4b of the shoulder groove 4 promotes more effective drainage from the stepping side to the trailing side of the tire's ground contact surface. Furthermore, after the wear of the tire has progressed, the groove extends from the stepping side of the tire's ground contact surface to the direction in which the water is drained, so that sufficient wet grip with the road surface can be obtained. .
- the tire 20 of the second embodiment has the same configuration as the tire of the first embodiment, except for the configuration of the shoulder land portion. and the description thereof is omitted.
- FIG. 4 is a diagram schematically showing the contact surface of the tire 20 according to the second embodiment of the present invention. Note that in FIG. 4 , the grooves in the plan view of the tread surface 11 when the wear of the tire progresses are also indicated by dotted lines.
- shoulder land portions 30a and 30b are defined by a pair of circumferential main grooves 2a arranged on the outermost side in the tire width direction and tread edges TE.
- Center land portions 3c and 3d are defined by 2b and a pair of circumferential main grooves 2a.
- the shoulder land portions 30a and 30b extend in the tire width direction and communicate with the tread edge TE and the circumferential main groove 2a. and 30b) are divided into a plurality of block land portions 301a and 301b (in this embodiment, the block land portions 301a and 301b, which are entirely located within the ground plane, are Two block land portions 301a and 301b are arranged, each of which is arranged one by one, and a part of the block land portion is located in the ground contact surface).
- width direction grooves 50 may be parallel to the tire width direction WD in a plan view of the tire, or may extend at an inclination angle of 45° or less with respect to the tire width direction WD. Further, the width direction grooves 50 may extend linearly in the tire width direction as shown in FIG. 4, or may extend in a zigzag or wavy shape in the tire width direction.
- the number of block land portions arranged in the ground contact surface is not particularly limited, but it is possible that 2 to 10 block land portions 301a and 301b are arranged in the contact surface. preferable.
- the drainage performance of the tire can be more effectively ensured, and by arranging 10 or less of each block land portion, sufficient block land portions can be obtained. Rigidity can be maintained.
- "arranged within the ground plane” means that if even part of the block land portions 301a and 301b are located within the ground plane, they are located within the ground plane.
- one or more shoulder grooves 4 are preferably arranged in each of the block land portions 301a and 301b from the viewpoint of effectively ensuring sufficient drainage when tire wear progresses. .
- the number of shoulder grooves 4 arranged in each of the block land portions 301a and 301b is preferably three or less.
- the tire according to the present invention can be used for tires of any type, but preferably for tires for passenger cars.
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Abstract
Description
本願は、2021年9月22日に日本に出願された特願2021-154870号に基づく優先権を主張するものであり、その内容の全文をここに援用する。
トレッド踏面に、タイヤ周方向に延びる複数の周方向主溝を有し、
タイヤ幅方向最外側に配置される前記周方向主溝とトレッド端とによって区画される、ショルダ陸部に、少なくとも1本のショルダ溝を備え、
前記ショルダ溝は、溝底側に、前記トレッド踏面側よりも溝幅が大きくなる拡幅部を有し、
前記ショルダ溝は、トレッド踏面においてタイヤ幅方向に沿って延び、
前記拡幅部のタイヤ径方向における最大幅部分は、前記トレッド踏面の平面視で、タイヤ幅方向に対して25°以上の傾斜角度で延びることを特徴とする、タイヤ。
以下に、図面を参照しつつ、本発明に係るタイヤの実施形態を例示説明する。各図において共通する構成要素には同一の符号を付している。
図1は、本発明の第1の実施形態に係るタイヤ10の、タイヤの軸方向に見た接地面を模式的に示す図である。なお、図1では、タイヤの摩耗進展時におけるトレッド踏面1の平面視における溝についても、点線で示している。また、図1では、タイヤの摩耗進展時における接地面の外輪郭線を概略的に点線C1で示している。
本明細書において、「トレッド端(TE)」とは、トレッド踏面(1)のタイヤ幅方向端を意味する。
ここで、「リム」とは、タイヤが生産され、使用される地域に有効な産業規格であって、日本ではJATMA(日本自動車タイヤ協会)のJATMA YEAR BOOK、欧州ではETRTO (The European Tyre and Rim Technical Organisation)のSTANDARDS MANUAL、米国ではTRA (The Tire and Rim Association, Inc.)のYEAR BOOK等に記載されているまたは将来的に記載される、適用サイズにおける標準リム(ETRTOのSTANDARDS MANUALではMeasuring Rim、TRAのYEAR BOOKではDesign Rim)を指す(すなわち、上記の「リム」には、現行サイズに加えて将来的に上記産業規格に含まれ得るサイズも含む。「将来的に記載されるサイズ」の例としては、ETRTOのSTANDARDS MANUAL 2013年度版において「FUTURE DEVELOPMENTS」として記載されているサイズを挙げることができる。)が、上記産業規格に記載のないサイズの場合は、タイヤのビード幅に対応した幅のリムをいう。
また、「所定の内圧」とは、上記のJATMA YEAR BOOK等に記載されている、適用サイズ・プライレーティングにおける単輪の最大負荷能力に対応する空気圧(最高空気圧)をいい、上記産業規格に記載のないサイズの場合は、タイヤを装着する車両ごとに規定される最大負荷能力に対応する空気圧(最高空気圧)をいうものとする。
「最大負荷荷重」とは、上記最大負荷能力に対応する荷重をいうものとする。
なお、ここでいう空気は、窒素ガス等の不活性ガスその他に置換することも可能である。
本明細書において、「基準状態」とは、タイヤをリムに組み付け、上記所定の内圧を充填し、無負荷とした状態を指す。
また、周方向主溝2a及び2bの溝深さについても特に限定されないが、十分な排水性の観点及びタイヤの剛性維持の観点から、例えば、溝深さ3mm以上20mm以下とすることが好ましい。
なお、本実施形態のタイヤ10では、ショルダ陸部3a及び3b並びにセンタ陸部3c及び3dは、タイヤ周方向においては分断されていないリブ状陸部であるが、幅方向溝によって分断されたブロック状陸部とすることもできる。
図2は、図1のA-A線に沿う断面図であり、図3は、ショルダ溝の形状について説明するための模式的な斜視図である。
なお、ショルダ溝4のトレッド踏面1における溝幅は特に限定されない。
例えば、図2に示すように、第1拡幅部4aが、トレッド踏面1から第2拡幅部4b側に向かって段階的に溝幅が増加する形状としてもよく、あるいは、溝4を、トレッド踏面1から第2拡幅部4bに至るまでは、拡幅せずに一定の溝幅を有するものとしてもよい。
また、図2に示すように、断面視においてトレッド踏面1側から溝底43側に向かって段階的に溝幅が増加して、溝底43付近に最大幅部分を有する形状としてもよい。第2拡幅部4bの形状についても特に限定されず、第2拡幅部4bの断面形状を矩形状とする等、第1拡幅部4a側から溝底43に至るまで一定の溝幅を有するものとしてもよい。また、第2拡幅部4bの断面形状を円形状又は楕円形状とする等、第1拡幅部4a側から溝底43側における途中に最大幅部分を有する形状としてもよい。
ここで、第2拡幅部4bの最大幅部分(Pw)とは、基準状態において、ショルダ溝4の第2拡幅部4bの延在方向に垂直に測ったときの、互いに対向する一対の溝壁面同士の間隔が最大である部分を意味している。
また、最大幅部分Pwの、トレッド踏面1の平面視における傾斜角度θ1とは、図1に示すように、ショルダ溝4の一方端(図1の例では、タイヤ幅方向一方端)とショルダ溝4の他方端(図1の例では、タイヤ幅方向他方端)とをつなぐ線分(図1の例では、ショルダ溝4の一方端の溝幅方向中心と、ショルダ溝4の他方端の溝幅方向中心とをつなぐ線分)の、タイヤ幅方向WDに対する傾斜角度を意味している。
本実施形態のタイヤ10によれば、タイヤ幅方向最外側に配置されたショルダ陸部3a及び3bに、トレッド踏面1においてタイヤ幅方向WDに沿って延びるショルダ溝4を配置することによって、排水性を確保することができる。ショルダ溝4は、タイヤ幅方向WDに沿う向きに延びることから、タイヤ10の直進時においては、接地面の踏み込み側の輪郭線に沿うように接地することになり、ショルダ溝4の端部における偏摩耗及びノイズの発生を抑制することができる。
また、ショルダ溝4は、溝底側に、トレッド踏面1側よりも溝幅が大きくなる拡幅部(本実施形態においては第1拡幅部4a及び第2拡幅部4b)を有するため、タイヤの摩耗進展時においても十分な排水性を確保することができる。
さらに、ショルダ溝4は、タイヤの摩耗進展時においてはタイヤ幅方向WDに対して25°以上傾斜している。タイヤの摩耗進展時においては、図1に点線C1で例示するように、摩耗進展前の状態から接地面の外輪郭線が変化する。溝による排水性は、タイヤの踏み込み側に近い位置において、溝が接地面の外輪郭線に直交する向きに延びているほど、高まる傾向にある。そこで、本実施形態においては、図1に示すように、タイヤの摩耗進展前においては、ショルダ溝4がタイヤの幅方向に沿って延びるものとし、タイヤの摩耗進展後においては、ショルダ溝4(本実施形態においては第2拡幅部4b)がタイヤ幅方向に対して25°以上傾斜して延びるものとしている。これによって、タイヤの摩耗進展後は、タイヤの回転に伴い、ショルダ溝4がタイヤの踏み込み側に近くなった際に、摩耗進展後の接地面の外輪郭線に対してほぼ垂直になるタイミングで、タイヤの幅方向内側からトレッド端TE側に向かう排水が促進される。また、ショルダ溝4をショルダ陸部に設けることによって、センタ陸部に配置するよりも、トレッド端TEに向かう排水が促進されやすく、タイヤの摩耗進展時においても十分な排水性を確保することができる。
ここで、「接地面内において、配置される」とは、ショルダ溝4の一部でも接地面内に位置していれば、接地面内に位置しているものとする。
次に、本発明の他の実施形態(第2の実施形態)に係るタイヤについて、図4を参照しながら説明する。第2の実施形態のタイヤ20は、ショルダ陸部の構成が異なる以外は、第1の実施形態のタイヤと同様の構成であり、第1の実施形態と同様の構成については、同一の符号を付してその説明を省略する。
ここで、「接地面内に配置される」とは、ブロック陸部301a及び301bの一部でも接地面内に位置していれば、接地面内に位置しているものとする。
Claims (6)
- トレッド踏面に、タイヤ周方向に延びる複数の周方向主溝を有し、
タイヤ幅方向最外側に配置される前記周方向主溝とトレッド端とによって区画される、ショルダ陸部に、少なくとも1本のショルダ溝を備え、
前記ショルダ溝は、溝底側に、前記トレッド踏面側よりも溝幅が大きくなる拡幅部を有し、
前記ショルダ溝は、トレッド踏面においてタイヤ幅方向に沿って延び、
前記拡幅部のタイヤ径方向における最大幅部分は、前記トレッド踏面の平面視で、タイヤ幅方向に対して25°以上の傾斜角度で延びることを特徴とする、タイヤ。 - 前記ショルダ溝のトレッド踏面における溝幅は、1.5mm未満である、請求項1に記載のタイヤ。
- 前記ショルダ溝のトレッド踏面における延在長さは、タイヤ接地幅の25%以上である、請求項1又は2に記載のタイヤ。
- 前記ショルダ溝は、タイヤの接地面内において、前記ショルダ陸部に3~10本配置される、請求項1~3のいずれか一項に記載のタイヤ。
- 前記ショルダ陸部は、タイヤ幅方向に延びるとともにトレッド端及び前記周方向主溝に連通する、複数の幅方向溝によって、複数のブロック陸部に区画され、
前記ブロック陸部は、タイヤの接地面内において、2~10個配置される、請求項1~4のいずれか一項に記載のタイヤ。 - 前記ショルダ溝は、各前記ブロック陸部に1~3本配置される、請求項5に記載のタイヤ。
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