JP2002293110A - Tire for heavy load - Google Patents
Tire for heavy loadInfo
- Publication number
- JP2002293110A JP2002293110A JP2001103021A JP2001103021A JP2002293110A JP 2002293110 A JP2002293110 A JP 2002293110A JP 2001103021 A JP2001103021 A JP 2001103021A JP 2001103021 A JP2001103021 A JP 2001103021A JP 2002293110 A JP2002293110 A JP 2002293110A
- Authority
- JP
- Japan
- Prior art keywords
- tire
- groove
- land
- edge
- top surface
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/04—Tread patterns in which the raised area of the pattern consists only of continuous circumferential ribs, e.g. zig-zag
- B60C11/042—Tread patterns in which the raised area of the pattern consists only of continuous circumferential ribs, e.g. zig-zag further characterised by the groove cross-section
- B60C11/047—Tread patterns in which the raised area of the pattern consists only of continuous circumferential ribs, e.g. zig-zag further characterised by the groove cross-section the groove bottom comprising stone trapping protection elements, e.g. 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
- B60C11/04—Tread patterns in which the raised area of the pattern consists only of continuous circumferential ribs, e.g. zig-zag
- B60C11/042—Tread patterns in which the raised area of the pattern consists only of continuous circumferential ribs, e.g. zig-zag further characterised by the groove cross-section
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】偏磨耗抑制のため、周方向溝
の溝底に設けた段差陸部を有する重荷重用タイヤの改良
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a heavy-duty tire having a stepped land portion provided at a groove bottom of a circumferential groove to suppress uneven wear.
【０００２】[0002]
【従来の技術】高速走行するトラック、バスなどの重荷
重用車両に用いられるタイヤは、通常周方向に複数の溝
を有するトレッドパターンを具えるが、これらのタイヤ
は、その磨耗寿命に達する前に、リブ周辺の偏磨耗によ
りタイヤ寿命を低下させるという問題があり、これに対
して、周方向溝の溝底に段差陸部を設け、これに、すべ
り方向の負荷を負担させることにより、偏磨耗の加速度
的進行を有効に抑制できることが知られている。図４
（ａ）は、この従来技術における段差陸部の平面図、図
４（ｂ）は、このＢ−Ｂ断面図である。周方向溝９１は
陸部９２を区画するとともに、その溝底から***する段
差陸部９３を有している。この段差陸部の頂面９５は、
陸部９２よりややタイヤ半径方向内方に位置していて、
タイヤの転動時、この頂面９５は路面に引きずられここ
に制動方向のせん断力が集中し、周辺の陸部に対するせ
ん断力が低減し偏磨耗が抑制される。2. Description of the Related Art Tires used in heavy-duty vehicles such as trucks and buses running at high speed usually have a tread pattern having a plurality of grooves in a circumferential direction. However, there is a problem that the tire life is shortened due to uneven wear around the ribs. In contrast, uneven wear is provided by providing a stepped land portion at the groove bottom of the circumferential groove to bear a load in the sliding direction. Is known to be able to effectively suppress the accelerated progression of. FIG.
FIG. 4A is a plan view of a stepped land portion according to the related art, and FIG. 4B is a cross-sectional view taken along line BB. The circumferential groove 91 defines a land portion 92 and has a step land portion 93 protruding from the groove bottom. The top surface 95 of this step land is
It is located slightly inward in the tire radial direction from the land part 92,
When the tire rolls, the top surface 95 is dragged by the road surface, where the shearing force in the braking direction is concentrated, and the shearing force on the surrounding land is reduced, thereby suppressing uneven wear.
【０００３】[0003]
【発明が解決しようとする課題】この段差陸部９３は、
もともとの周方向溝９１をサイド溝９４Ｒと９４Ｌに分
割するとともに、その溝容積を低下させ、その結果、ウ
エット性能の低下を招く。この段差陸部９３による容積
低下を抑制するために、通常、サイド溝壁の立った周方
向溝９１が用いられる。しかし、溝壁が立って、溝壁角
度が小さくなると、サイド溝に石を挟みこみ抜けなくな
る、いわゆる、石噛み現象が発生しやすくなる。石噛み
が発生するとすると、そこにクラックが入り、タイヤの
破壊に至るという問題を起こす。これを防止するため
に、溝幅を広げようとすると、陸部面積を減少させるこ
とになり、タイヤの耐磨耗性能を低下させる。The step land portion 93 is
The original circumferential groove 91 is divided into side grooves 94R and 94L, and the volume of the groove is reduced. As a result, the wet performance is reduced. In order to suppress the volume decrease due to the stepped land portion 93, a circumferential groove 91 having a side groove wall is usually used. However, when the groove wall is raised and the angle of the groove wall is reduced, a stone is not easily caught in the side groove, that is, a so-called stone biting phenomenon is likely to occur. If a stone bite occurs, a crack is formed therein, causing a problem that the tire is broken. If an attempt is made to increase the groove width in order to prevent this, the land area is reduced, and the wear resistance of the tire is reduced.
【０００４】溝形状と石噛みとの関係を示す図３を参照
して、以上のことを詳述する。図３において、縦軸は溝
深さに対する溝幅の割合を、横軸は溝壁角度を示すが、
溝壁角度は横軸の左側の方が小さく溝壁が立っている。
また、直線Ｌ上の点で表される溝は、溝底のない、三角
形状となることを意味しており、この線の上方は溝が逆
台形形状となる領域、この線の下方は溝の存在しない領
域である。直線Ｌより上の領域はさらに、石噛みがほと
んど発生しない安全域Ａ、悪路走行時、石噛みの発生の
可能性のある悪路危険域Ｂ，および、通常走行でも石噛
みの発生の危険性のある危険域Ｃに分割される。同じ溝
壁角度、同じ溝深さで、溝幅を小さくしてゆくと、最初
のＸ点では石噛みは発生しない安全域Ａ内にあるが、悪
路危険域を過ぎて危険域Ｃ内のＹ点では、石噛みが発生
しやすくなる。溝壁角度が小さいほど、また、溝幅が狭
いほど、石噛みの頻度は発生しやすくなるので、図３の
各領域の境界線は右下がりの図となっている。The above will be described in detail with reference to FIG. 3 showing the relationship between the groove shape and the stone bite. In FIG. 3, the vertical axis indicates the ratio of the groove width to the groove depth, and the horizontal axis indicates the groove wall angle.
The groove wall angle is smaller on the left side of the horizontal axis, and the groove wall stands.
Further, a groove represented by a point on the straight line L means that the groove has no groove bottom and has a triangular shape. Above this line, a region where the groove has an inverted trapezoidal shape, and below this line is a groove. Is an area where does not exist. The area above the straight line L further includes a safety area A where almost no rock biting occurs, a dangerous road risk area B where there is a possibility of rock biting when driving on a rough road, and a risk of rock biting even during normal driving. Is divided into dangerous danger areas C. If the groove width is reduced with the same groove wall angle and the same groove depth, the first point X is within the safety area A where no rock biting occurs, but passes through the dangerous road dangerous area and within the dangerous area C. At point Y, stone biting is likely to occur. As the groove wall angle is smaller and the groove width is smaller, the frequency of stone biting is more likely to occur. Therefore, the boundary line of each region in FIG.
【０００５】図３において、従来の段差陸部を有する周
方向溝においては、先述の通り、溝壁を急角度に立てて
溝容積を確保せざるを得ず、また溝幅を広げるわけにも
行かなかったため、危険域Ｃから脱することが難しかっ
た。[0005] In FIG. 3, in the conventional circumferential groove having a stepped land portion, as described above, the groove wall must be set at a steep angle to secure the groove volume, and the groove width cannot be increased. Because he did not go, it was difficult to escape from danger zone C.
【０００６】本発明は、このような問題点に鑑みてなさ
れたものであり、溝内に設けた段差陸部の耐偏磨耗効果
を損なうことなく、また、陸部面積を縮小して耐磨耗性
を犠牲にすることもなく、その両側のサイド溝での石噛
みの発生を抑制してなる重荷重タイヤを提供することを
目的とするものである。SUMMARY OF THE INVENTION The present invention has been made in view of such problems, and does not impair the uneven wear resistance effect of the step land provided in the groove and reduces the land area to reduce the wear resistance. It is an object of the present invention to provide a heavy-duty tire that suppresses the occurrence of stone biting in side grooves on both sides thereof without sacrificing wearability.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するた
め、この発明はなされたものであり、その要旨構成なら
びに作用を以下に示す。請求項１に記載の重荷重用タイ
ヤは、タイヤのトレッド部表面に、一定幅で周方向に延
在する周方向溝を含む溝部と、これらの溝部により区画
された陸部とを有し、少なくとも一本の周方向溝に、そ
の溝底より***して、トレッド部の輪郭線よりタイヤ半
径方向内方に頂面をもち、周方向に延在する段差陸部を
設けるとともに、この頂面の、周方向に延在する縁部の
うち少なくとも一方を、周方向に沿って滑らかに蛇行さ
せてなるものである。Means for Solving the Problems The present invention has been made to achieve the above object, and its gist structure and operation will be described below. The heavy-duty tire according to claim 1 has, on a surface of a tread portion of the tire, a groove portion including a circumferential groove extending in a circumferential direction at a constant width, and a land portion defined by these grooves, and at least. A single circumferential groove is provided with a stepped land portion that protrudes from the groove bottom, has a top surface inward in the tire radial direction from the contour of the tread portion, and extends in the circumferential direction. , At least one of the edges extending in the circumferential direction is smoothly meandered along the circumferential direction.
【０００８】このタイヤによれば、段差陸部の縁部が蛇
行することにより、もともとの周方向溝内に段差陸部を
設けてできる両側のサイド溝は、幅の狭い部分と広い部
分を交互にもつことになる。狭幅の部分では石噛みがよ
り高い頻度で発生するが、狭幅部分は周方向には短い範
囲に限定されているので、タイヤの転動にともなう段差
陸部の変形により、噛んだ石をすぐにサイド溝から排出
でき、タイヤの破損にいたることはない。また、広幅部
分はもともと、石噛みに対する安全領域なので、石噛み
が発生することはない。According to this tire, since the edge of the step land portion meanders, the side grooves formed on both sides by forming the step land portion in the original circumferential groove alternate between narrow portions and wide portions. Will have. Stone biting occurs more frequently in the narrow part, but the narrow part is limited to a short range in the circumferential direction, so deformation of the stepped land part due to rolling of the tire causes stones The tires can be immediately discharged from the side grooves without tire damage. Also, since the wide portion is originally a safe area for stone biting, stone biting does not occur.
【０００９】請求項２に記載のタイヤは、請求項１に記
載するところにおいて、段差陸部の頂面の幅は、一定に
してなるものである。According to a second aspect of the present invention, in the tire according to the first aspect, the width of the top surface of the step land portion is made constant.
【００１０】これによれば、頂面が一定幅で設けられて
いるので、周方向に均一に段差陸部が機能し、偏磨耗を
効果的に抑制することができる。[0010] According to this, since the top surface is provided with a constant width, the step land portion functions uniformly in the circumferential direction, and uneven wear can be effectively suppressed.
【００１１】請求項３に記載のタイヤは、請求項１〜２
のいずれかに記載するところにおいて、段差陸部の頂面
の縁部が一定周期で蛇行してなるものである。The tire according to claim 3 is the tire according to claims 1-2.
Wherein the edge of the top surface of the step land meanders at a constant period.
【００１２】これによれば、段差陸部の頂面の縁部は一
定周期で蛇行しているので、段差陸部を設けたことによ
る偏磨耗抑制効果を全周にわたり均一に発揮することが
できるともに、サイド溝の狭幅部分に噛みこんだ石の排
出効果を全周にわたり得ることができる。According to this, since the edge of the top surface of the step land meanders at a constant period, the uneven wear suppression effect due to the provision of the step land can be exerted uniformly over the entire circumference. In both cases, the effect of discharging the stone caught in the narrow portion of the side groove can be obtained over the entire circumference.
【００１３】請求項４に記載のタイヤは、請求項１〜３
のいずれかに記載するところにおいて、タイヤの軸を含
む横断面において、周方向溝と陸部との境界線を構成す
る、周方向溝の一方の陸部縁と、この陸部縁に近い側の
段差陸部頂面縁とのタイヤ軸方向に沿った間隔の最大値
と最小値との比を1.2以上としてなるものである。The tire according to the fourth aspect is the tire according to the first to third aspects.
In any of the above, in a cross section including the axis of the tire, one land portion edge of the circumferential groove, which constitutes a boundary between the circumferential groove and the land portion, and a side near the land portion edge The ratio of the maximum value to the minimum value of the interval along the tire axial direction with the top edge of the step land portion is 1.2 or more.
【００１４】これによれば、陸部縁とこの陸部縁に近い
側の段差陸部頂面縁とのタイヤ軸方向に沿った間隔の最
大値と最小値との比が1.2以上としたので、サイド溝の
狭幅部分に噛みこんだ石を有効に排出することができ
る。According to this, the ratio between the maximum value and the minimum value of the interval along the tire axial direction between the land edge and the edge of the step land near the land edge is set to 1.2 or more. Thus, the stone caught in the narrow portion of the side groove can be effectively discharged.
【００１５】請求項５に記載のタイヤは、請求項１〜４
のいずれかに記載するところにおいて、陸部縁と、この
陸部縁に近い側の段差陸部頂面縁とのタイヤ軸方向に沿
った間隔の最大値と最小値との比を15.0以下としてなる
ものである。The tire according to claim 5 is the tire according to claims 1-4.
Where the ratio between the maximum value and the minimum value of the distance along the tire axis direction between the land edge and the step land top surface edge near the land edge is set to 15.0 or less. It becomes.
【００１６】陸部縁とこの陸部縁に近い側の段差陸部頂
面縁とのタイヤ軸方向に沿った間隔の最大値と最小値と
の比が15.0を越えると、段差陸部を設けたことによる偏
磨耗抑制効果を十分に発揮できず、むしろ、蛇行振幅が
大きいことによる新たな偏磨耗の発生を招くことになる
ので、この比を15.0以下とするこのタイヤは好適なもの
である。When the ratio between the maximum value and the minimum value of the distance along the tire axial direction between the land edge and the edge of the step land near the land edge exceeds 15.0, a step land is provided. It is not possible to sufficiently exert the effect of suppressing uneven wear due to this, but rather, it will cause the occurrence of new uneven wear due to large meandering amplitude, so this tire with this ratio of 15.0 or less is suitable. .
【００１７】請求項６に記載のタイヤは、請求項１〜５
のいずれかに記載するところにおいて、段差陸部の頂面
の縁部の周方向の蛇行周期を、タイヤ周長の1/30〜1/10
0としてなるものである。The tire according to claim 6 is the tire according to claims 1 to 5
Where the meandering period in the circumferential direction of the edge of the top surface of the step land portion is 1/30 to 1/10 of the tire circumference.
It should be 0.
【００１８】段差陸部の頂面の縁部の周方向の蛇行周期
を、タイヤ周長の1/30を越えると、サイド溝幅の周方向
の変化が緩やかなため、狭幅部分に噛みこんだ石を有効
に排出できなくなり、また、蛇行周期がタイヤ周長の1/
100に満たないと、段差陸部を設けたことによる偏磨耗
抑制効果を十分に発揮できず、むしろ、蛇行周期が短い
ことによる新たな偏磨耗の発生を招くことになるので、
蛇行周期をタイヤ周長の1/30〜1/100とするこのタイヤ
は好適なものである。If the circumferential meandering period of the edge of the top surface of the stepped land exceeds 1/30 of the tire circumferential length, the circumferential change in the width of the side groove is gentle, so that the narrow width portion is bitten. The stone cannot be discharged effectively, and the meandering cycle is 1 /
If it is less than 100, it is not possible to sufficiently exert the effect of suppressing uneven wear due to the provision of the step land portion, but rather, it will cause the occurrence of new uneven wear due to the short meandering cycle,
This tire having a meandering cycle of 1/30 to 1/100 of the tire circumference is suitable.
【００１９】[0019]
【発明の実施の形態】本発明に係る重荷重用タイヤの実
施の形態について図１〜図２に基づいて説明する。図１
は本発明に係るタイヤのトレッド部をその半径方向外側
からみた、段差陸部の平面図である。図２（ａ）は図１
のａ−ａ’ 断面、図２（ｂ）は図１のｂ−ｂ’ 断面を
示す断面図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a heavy duty tire according to the present invention will be described with reference to FIGS. Figure 1
FIG. 2 is a plan view of a step land portion of the tire according to the present invention, as viewed from a radially outer side of a tread portion. FIG. 2A shows FIG.
FIG. 2B is a cross-sectional view showing a bb ′ cross section of FIG.
【００２０】図１に示す通り、このタイヤは、その周方
向に延在して陸部１２を区画する周方向溝１１の中に蛇
行ピッチＰで波状に蛇行して、周方向に延在する段差陸
部１３を設けている。この段差陸部１３は周方向溝を右
側のサイド溝１４Ｒ，左側のサイド溝１４Ｌに区画す
る。As shown in FIG. 1, the tire extends in the circumferential direction so as to meander in a wavy manner at a meandering pitch P in a circumferential groove 11 defining a land portion 12 and extending in the circumferential direction. A step land portion 13 is provided. The step land portion 13 divides the circumferential groove into a right side groove 14R and a left side groove 14L.
【００２１】そして、図２（ａ）、図２（ｂ）に示すよ
うに、段差陸部１３は、陸部よりＤだけ径方向に低く設
けられた頂面１５を有していて、接地転動時、すべり成
分を負担して、陸部１２の偏磨耗の進行を抑制する働き
をもたらしている。As shown in FIGS. 2 (a) and 2 (b), the step land portion 13 has a top surface 15 provided radially lower by D than the land portion, and When moving, it has a function of suppressing the progress of uneven wear of the land portion 12 by bearing the slip component.
【００２２】図１において、段差陸部１３が蛇行してい
ることにより、陸部１２と周方向溝１１の境界を形成す
る陸部縁２１と、段差陸部１３の頂面１５の頂面縁２２
とのタイヤ軸方向に沿った間隔が周期的に変化し、サイ
ド溝１４Ｒ、１４Ｌにそれぞれ狭幅部分Ｒｎと広幅部分
Ｒｗとを交互に配設する。サイド溝の狭幅部分Ｒｎは、
図３に示す危険域Ｃに属する点で表される断面形状を有
しているため、石を噛みやすいが、この狭幅部分Ｒｎ
は、周方向には短い範囲に限定されているため、転動時
の段差陸部１３の変形により噛んだ石を簡単に排出する
ことができる。また、サイド溝の広幅部分Ｒｗは、図３
に示す安全域Ａに属する点で表される断面形状を有して
いるので、悪路走行時でも石を噛む確率は極めて低い。In FIG. 1, the stepped land portion 13 meanders, so that a land portion edge 21 forming a boundary between the land portion 12 and the circumferential groove 11 and a top surface edge of a top surface 15 of the step land portion 13 are formed. 22
Are periodically changed along the tire axial direction, and narrow portions Rn and wide portions Rw are alternately arranged in the side grooves 14R and 14L, respectively. The narrow portion Rn of the side groove is
Since it has a cross-sectional shape represented by a point belonging to the danger zone C shown in FIG.
Is limited to a short range in the circumferential direction, so that the stone caught by the deformation of the step land portion 13 during rolling can be easily discharged. The wide portion Rw of the side groove is shown in FIG.
Has a cross-sectional shape represented by a point belonging to the safety area A shown in FIG.
【００２３】図１において、具体的寸法の例は以下の通
りである。タイヤサイズは２９５／７５Ｒ２２５、周方
向溝１１の溝幅Ｗは30mm、溝深さHは15.5mm、溝角度α
は2.5度、段差陸部１３の陸部１２との段差Dは2.5mm、
および、頂面１５の幅Ｔは8mmである。また、この段差
陸部１３は正弦波状に蛇行しており、その周期Ｐは70m
m、陸部縁２１と段差陸部１３の頂面１５の頂面縁２２
とのタイヤ軸方向に沿った間隔の最大値Ｚｍａｘは18m
m、最小値Ｚｍｉｎは4mmであり、従ってこの最小値に対
する最大値の割合は4.5である。In FIG. 1, examples of specific dimensions are as follows. The tire size is 295 / 75R225, the groove width W of the circumferential groove 11 is 30 mm, the groove depth H is 15.5 mm, and the groove angle α.
Is 2.5 degrees, the step D between the step part 13 and the land part 12 is 2.5 mm,
The width T of the top surface 15 is 8 mm. Further, the step land portion 13 meanders in a sine wave shape, and its cycle P is 70 m.
m, land edge 21 and top surface edge 22 of top surface 15 of step land portion 13
The maximum value Zmax of the interval along the tire axis direction is 18 m
m, the minimum value Zmin is 4 mm, so the ratio of the maximum value to this minimum value is 4.5.
【００２４】[0024]
【実施例】図１の実施例のタイヤと図４に示す従来例の
タイヤを比較した。実施例のタイヤの寸法緒元は、前述
の通りであり、従来例のタイヤは、実施例のタイヤの段
差陸部を周方向にまっすぐ、周方向溝の中央に延在させ
たものであり、したがって、他の寸法諸元である周方向
溝の溝幅、溝深さ、段差陸部の頂面の幅、頂面の段差等
は実施例のものと同じである。EXAMPLE A comparison was made between the tire of the example shown in FIG. 1 and the conventional tire shown in FIG. The dimensions of the tire of the example are as described above, and the conventional tire is a tire in which the step land portion of the example is straight in the circumferential direction and extends in the center of the circumferential groove, Therefore, the other dimensions such as the groove width and groove depth of the circumferential groove, the width of the top surface of the stepped land portion, the step of the top surface, and the like are the same as those of the embodiment.
【００２５】また、石噛み評価の方法は次の通りであ
る。すなわち、米国において、インターステートと地方
の一般道路との両方を含む高速道路を実地走行し、５０
００マイル走行後の石噛み個数をカウントして評価し比
較した。その結果、従来例のタイヤの石噛み個数を１０
０とすると、実施例のタイヤの石噛み個数は２０個とな
り、耐石噛み性能を大幅に改善することができた。The method of stone bite evaluation is as follows. In other words, in the United States, the user travels on a highway including both an interstate and a local general road, and
The number of stone bites after traveling for 00 miles was counted, evaluated and compared. As a result, the number of stone bites of the conventional tire was 10
When the value is set to 0, the number of stone bites of the tire of the example is 20, and the stone biting performance can be greatly improved.
【００２６】[0026]
【発明の効果】以上述べたところから明らかなように、
本発明によれば、段差陸部を周方向溝内に蛇行させて設
けているので、耐磨耗性能や耐偏磨耗性能を損なわず
に、石噛みの発生しにくいタイヤを提供することができ
る。As is apparent from the above description,
According to the present invention, since the step land portion is provided in a meandering manner in the circumferential groove, it is possible to provide a tire in which stone biting is less likely to occur without impairing the wear resistance performance and uneven wear resistance performance. .
【図１】本発明に係るタイヤの周方向溝の平面図であ
る。FIG. 1 is a plan view of a circumferential groove of a tire according to the present invention.
【図２】図１のａ−ａ’ 矢視、およびｂ−ｂ’ 矢視を
示す矢視図である。FIG. 2 is a view taken along arrows aa ′ and bb ′ of FIG. 1;
【図３】溝形状と石噛みの関係を図式的にあらわす関係
図である。FIG. 3 is a relationship diagram schematically showing a relationship between a groove shape and a stone bite.
【図４】従来のタイヤの周方向溝の平面図である。FIG. 4 is a plan view of a circumferential groove of a conventional tire.
１１ 周方向溝 １２ 陸部 １３ 段差陸部 １４Ｌ、１４Ｒ サイド溝部 １５ 段差陸部の頂面 ２１ 陸部縁 ２２ 段差陸部頂面縁 Ｒｎ サイド溝の狭幅部分 Ｒｗ サイド溝の広幅部分 DESCRIPTION OF SYMBOLS 11 Circumferential groove 12 Land part 13 Step land part 14L, 14R Side groove part 15 Top surface of step land part 21 Land part edge 22 Step land part top surface edge Rn Narrow part of side groove Rw Wide part of side groove
Claims (6)
方向に延在する周方向溝を含む溝部と、これらの溝部に
より区画された陸部とを有し、少なくとも一本の周方向
溝に、その溝底より***して、トレッド部の輪郭線より
タイヤ半径方向内方に頂面をもち、周方向に延在する段
差陸部を設けるとともに、この頂面の、周方向に延在す
る縁部のうち少なくとも一方を、周方向に沿って滑らか
に蛇行させてなる重荷重用タイヤ。At least one circumferential groove is provided on a surface of a tread portion of a tire, the groove including a circumferential groove extending in a circumferential direction at a constant width, and a land portion defined by the grooves. A stepped land portion that protrudes from the groove bottom, has a top surface inward in the tire radial direction from the contour of the tread portion, and extends in the circumferential direction, and extends in the circumferential direction of the top surface. A heavy duty tire in which at least one of the edges is smoothly meandered along the circumferential direction.
請求項１に記載の重荷重用タイヤ。2. The heavy duty tire according to claim 1, wherein the width of the top surface of the step land portion is constant.
してなる請求項１〜２のいずれかに記載の重荷重用タイ
ヤ。3. The heavy duty tire according to claim 1, wherein an edge of a top surface of the step land portion meanders at a constant period.
向溝と陸部との境界線を構成する、周方向溝の一方の陸
部縁と、この陸部縁に近い側の段差陸部頂面縁とのタイ
ヤ軸方向に沿った間隔の最大値と最小値との比を1.2以
上としてなる請求項１〜３のいずれかに記載の重荷重用
タイヤ。4. A cross section including the axis of the tire, one land edge of the circumferential groove forming a boundary between the circumferential groove and the land, and a step land near the land edge. The heavy load tire according to any one of claims 1 to 3, wherein a ratio of a maximum value and a minimum value of an interval along a tire axial direction with the top edge is 1.2 or more.
部頂面縁とのタイヤ軸方向に沿った間隔の最大値と最小
値との比を15.0以下としてなる請求項１〜４のいずれか
に記載の重荷重用タイヤ。5. The ratio between the maximum value and the minimum value of the distance between the land edge and the edge of the step land near the land edge along the tire axial direction is 15.0 or less. The heavy-duty tire according to any one of claims 1 to 4.
期を、タイヤ周長の1/30〜1/100としてなる請求項１〜
５のいずれかに記載の重荷重用タイヤ。6. The meandering period in the circumferential direction of the edge of the top surface of the step land portion is 1/30 to 1/100 of the tire circumference.
5. The heavy-duty tire according to any one of 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001103021A JP4707861B2 (en) | 2001-04-02 | 2001-04-02 | Heavy duty tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001103021A JP4707861B2 (en) | 2001-04-02 | 2001-04-02 | Heavy duty tire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002293110A true JP2002293110A (en) | 2002-10-09 |
| JP4707861B2 JP4707861B2 (en) | 2011-06-22 |
Family
ID=18956141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001103021A Expired - Fee Related JP4707861B2 (en) | 2001-04-02 | 2001-04-02 | Heavy duty tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4707861B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006182299A (en) * | 2004-12-28 | 2006-07-13 | Yokohama Rubber Co Ltd:The | Pneumatic tire |
| JP2008094274A (en) * | 2006-10-12 | 2008-04-24 | Bridgestone Corp | Pneumatic tire |
| JP2009061886A (en) * | 2007-09-05 | 2009-03-26 | Yokohama Rubber Co Ltd:The | Pneumatic tire |
| WO2009080125A1 (en) * | 2007-12-24 | 2009-07-02 | Pirelli Tyre S.P.A. | Heavy load vehicle tire |
| US8100159B2 (en) | 2006-10-24 | 2012-01-24 | Toyo Tire & Rubber Co., Ltd. | Pneumatic tire with circumferential main grooves having protrusions |
| JP2012091588A (en) * | 2010-10-25 | 2012-05-17 | Bridgestone Corp | Vulcanized tread and tire manufacturing method |
| JP2012091587A (en) * | 2010-10-25 | 2012-05-17 | Bridgestone Corp | Vulcanized tread and method of manufacturing tire |
| JP2012188047A (en) * | 2011-03-11 | 2012-10-04 | Bridgestone Corp | Tire |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10211805A (en) * | 1997-01-28 | 1998-08-11 | Pirelli Coordinamento Pneumatici Spa | Tire and tread band thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62196705U (en) * | 1986-06-06 | 1987-12-14 | ||
| JPH02179506A (en) * | 1988-12-29 | 1990-07-12 | Bridgestone Corp | Pneumatic tire |
| JPH06239107A (en) * | 1993-02-18 | 1994-08-30 | Ohtsu Tire & Rubber Co Ltd :The | Pneumatic tire with projection preventing stone from jamming |
| JP4149058B2 (en) * | 1998-12-18 | 2008-09-10 | 株式会社ブリヂストン | Heavy duty pneumatic tire |
| JP4275231B2 (en) * | 1998-12-24 | 2009-06-10 | 株式会社ブリヂストン | Heavy duty pneumatic tire that prevents uneven wear |
-
2001
- 2001-04-02 JP JP2001103021A patent/JP4707861B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10211805A (en) * | 1997-01-28 | 1998-08-11 | Pirelli Coordinamento Pneumatici Spa | Tire and tread band thereof |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006182299A (en) * | 2004-12-28 | 2006-07-13 | Yokohama Rubber Co Ltd:The | Pneumatic tire |
| JP4586537B2 (en) * | 2004-12-28 | 2010-11-24 | 横浜ゴム株式会社 | Pneumatic tire |
| JP2008094274A (en) * | 2006-10-12 | 2008-04-24 | Bridgestone Corp | Pneumatic tire |
| US8100159B2 (en) | 2006-10-24 | 2012-01-24 | Toyo Tire & Rubber Co., Ltd. | Pneumatic tire with circumferential main grooves having protrusions |
| JP2009061886A (en) * | 2007-09-05 | 2009-03-26 | Yokohama Rubber Co Ltd:The | Pneumatic tire |
| WO2009080125A1 (en) * | 2007-12-24 | 2009-07-02 | Pirelli Tyre S.P.A. | Heavy load vehicle tire |
| JP2012091588A (en) * | 2010-10-25 | 2012-05-17 | Bridgestone Corp | Vulcanized tread and tire manufacturing method |
| JP2012091587A (en) * | 2010-10-25 | 2012-05-17 | Bridgestone Corp | Vulcanized tread and method of manufacturing tire |
| JP2012188047A (en) * | 2011-03-11 | 2012-10-04 | Bridgestone Corp | Tire |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4707861B2 (en) | 2011-06-22 |
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