JP2000158913A - Pneumatic tire - Google Patents
Pneumatic tireInfo
- Publication number
- JP2000158913A JP2000158913A JP10332866A JP33286698A JP2000158913A JP 2000158913 A JP2000158913 A JP 2000158913A JP 10332866 A JP10332866 A JP 10332866A JP 33286698 A JP33286698 A JP 33286698A JP 2000158913 A JP2000158913 A JP 2000158913A
- Authority
- JP
- Japan
- Prior art keywords
- tread
- shoulder rib
- rubber
- pneumatic tire
- early wear
- 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.)
- Withdrawn
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
- B60C11/01—Shape of the shoulders between tread and sidewall, e.g. rounded, stepped or cantilevered
- B60C2011/013—Shape of the shoulders between tread and sidewall, e.g. rounded, stepped or cantilevered provided with a recessed portion
Landscapes
- Tires In General (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、リブタイプトレ
ッドパターンを有する空気入りタイヤにおいて、トレッ
ド最外側に位置するショルダリブの外側域に端を発する
偏摩耗の進行を有効に阻止するものである。BACKGROUND OF THE INVENTION The present invention relates to a pneumatic tire having a rib-type tread pattern, which effectively prevents the progress of uneven wear originating from an outer region of a shoulder rib located on the outermost side of the tread.
【０００２】[0002]
【従来の技術】ショルダリブに発生する偏摩耗の、トレ
ッド内側方向への進行を阻止する従来技術としては、た
とえば、特開昭５８−１９４６０６号公報に開示されて
いるように、ショルダリブに設けた周方向細溝を境に、
それより外側域を内側域に対して段下がりとし、この段
下がり表面を、荷重の作用下でのタイヤ転動に当たっ
て、路面に滑り接触させて摩耗犠牲部として機能させる
ことにより、トレッドの偏摩耗をその段下がり域に封じ
込めること、および、特開昭６１−１４３２０５号公報
に開示されているように、ショルダリブの外側縁近傍位
置に周方向細溝を設け、それより外側域の接地面圧を他
の部分に比して低減させることで、荷重の作用下でのタ
イヤの負荷転動に当たり、先の場合と同様に、周方向細
溝より外側部分を摩耗犠牲部として機能させて、そこに
偏摩耗を封じ込めること等が提案されている。2. Description of the Related Art As a conventional technique for preventing the uneven wear generated on a shoulder rib from progressing inwardly of a tread, for example, as disclosed in Japanese Patent Application Laid-Open No. 58-194606, a peripheral rib provided on the shoulder rib is disclosed. After the direction narrow groove,
The outer area is stepped down from the inner area, and this stepped surface is used as a wear sacrifice part by sliding contact with the road surface when the tire rolls under the action of load to function as a wear sacrificial part. And, as disclosed in Japanese Patent Application Laid-Open No. 61-143205, a narrow circumferential groove is provided near the outer edge of the shoulder rib to reduce the contact pressure of the outer region. By reducing compared to other parts, in the rolling of the tire under the action of the load, as in the previous case, the outer part of the circumferential narrow groove functions as a wear sacrificial part, and there It has been proposed to contain uneven wear.
【０００３】[0003]
【発明が解決しようとする課題】しかるに、かかる従来
技術にあっては、摩耗犠牲部を区画する周方向細溝より
外側域では、タイヤの負荷転動時の接地圧が極めて低く
なる一方で、その細溝より内側域には大きな接地圧が作
用すること等に起因して、前記周方向細溝の溝底への応
力集中が不可避となり、これがため、周方向細溝への溝
底クラックの発生頻度が高く、甚だしくは、その溝底ク
ラックの進行によって、摩耗犠牲部がもげ落ちるおそれ
もあった。However, in the prior art described above, the contact pressure at the time of rolling load of the tire becomes extremely low in the region outside the circumferential narrow groove which defines the wear sacrificial portion, Due to the fact that a large ground pressure acts on the area inside the narrow groove, stress concentration on the groove bottom of the circumferential narrow groove becomes unavoidable, and therefore, the crack of the groove bottom on the circumferential narrow groove is inevitable. The frequency of occurrence is high, and the abrasion sacrificed portion may fall off due to the progress of the groove bottom crack.
【０００４】この発明は、従来技術が抱えるこのような
問題点を解決することを課題とするものであり、それの
目的とするところは、ショルダリブの外側域に、従来技
術で述べたと同様の段下がり摩耗犠牲部を設けてなお、
前述したような溝底クラック等の故障の発生を十分に防
止できる空気入りタイヤを提供するにある。SUMMARY OF THE INVENTION An object of the present invention is to solve such problems of the prior art, and an object of the present invention is to provide, in the outer region of a shoulder rib, a step similar to that described in the prior art. Even after the falling wear sacrificial part is provided,
An object of the present invention is to provide a pneumatic tire that can sufficiently prevent the occurrence of a failure such as a groove bottom crack as described above.
【０００５】[0005]
【課題を解決するための手段】この発明の空気入りタイ
ヤは、トレッド周方向に、直線状もしくはジグザグ状に
連続して延びる複数本の主溝と、これらの主溝によって
トレッド幅方向に区分されたリブとを具え、トレッド幅
方向の最も外側に位置するショルダリブの外側域に、シ
ョルダリブの内側域に対して段下がりとなる段差部を設
け、この段差部の表面を、荷重の作用下でのタイヤの転
動に当たって路面に滑り接触させるものであり、前記段
差部内で、それとショルダリブの内側域との隣接部分
に、トレッドの他の構成部分より耐摩耗性の低い早期摩
耗ゴムを埋め込み配置し、この早期摩耗ゴムの表面を段
差部の表面とほぼ等しい面内に位置させたものである。A pneumatic tire according to the present invention is divided into a plurality of main grooves extending linearly or zigzag continuously in the tread circumferential direction, and is divided in the tread width direction by these main grooves. And a step portion that is stepped down from the inner region of the shoulder rib is provided in the outer region of the shoulder rib located at the outermost side in the tread width direction, and the surface of the step portion is subjected to a load under the action of a load. The rolling contact of the tire is to be brought into sliding contact with the road surface, and in the step portion, in an adjacent portion of the shoulder portion and the inner region of the shoulder rib, an early wear rubber having lower wear resistance than other components of the tread is embedded and arranged, The surface of the early wear rubber is located in a plane substantially equal to the surface of the step.
【０００６】この空気入りタイヤでは、従来技術で述べ
た周方向細溝に代えて、早期摩耗ゴムをもってショルダ
リブの外側域に段差部を区画し、段差部の一部としての
その早期摩耗ゴムをもまた積極的に引摺り摩耗させるこ
とで、その段差部を摩耗犠牲部として機能させて、ショ
ルダリブの偏摩耗をそこに封じ込めることができる。[0006] In this pneumatic tire, instead of the circumferential narrow groove described in the prior art, a step portion is defined in the outer region of the shoulder rib with early wear rubber, and the early wear rubber as a part of the step portion is also used. Also, by positively abrading the shoulder rib, the uneven portion of the shoulder rib can be contained therein by making the step portion function as a wear sacrificial portion.
【０００７】しかもここでは、従来技術でいうような周
方向細溝が存在しないことに加え、接地面内での接地圧
の急激な変化等に対しては、トレッドの他の構成部分に
比して弾性率もまた当然に低くなる早期摩耗ゴムにすぐ
れた応力緩和機能を発揮させることができるので、ショ
ルダリブの外側域と内側域との境界部分に、クラック等
の故障が生じることもない。Further, in this case, in addition to the fact that there is no circumferential narrow groove as in the prior art, abrupt changes in the contact pressure in the contact surface, etc., as compared with other components of the tread, are provided. As a result, the early wear rubber whose elastic modulus is also naturally lowered can exhibit an excellent stress relaxation function, so that a failure such as a crack does not occur at the boundary between the outer region and the inner region of the shoulder rib.
【０００８】ここで好ましくは、早期摩耗ゴムの埋め込
み中心位置を、ショルダリブの外側縁からショルダリブ
幅の１／３〜１／２の範囲とし、また、埋め込み深さ
を、主溝深さの１／５〜４／５の範囲、より好ましく
は、３／４程度とする。[0008] Preferably, the embedding center position of the early wear rubber is set in a range of 1/3 to 1/2 of the shoulder rib width from the outer edge of the shoulder rib, and the embedding depth is set to 1 / of the main groove depth. The range is 5/4/4, more preferably about 3/4.
【０００９】これによれば、段下がり部が偏摩耗の進展
を効果的にくい止めることができる。いいかえれば、埋
め込み位置が１／３未満では、段下がり部のリブ剛性が
低く、強い入力があるとリブティアが発生するおそれが
あり、それが１／２を越えると、逆に段上がり部のリブ
剛性が低くなってしまう。そしてまた、深さが１／５未
満では、使用条件によっては速く摩耗しすぎて早期摩耗
ゴムがなくなってしまい、４／５を越えると、過剰な力
が早期摩耗ゴムにかかるおそれがある。According to this, the step-down portion can effectively prevent the uneven wear from progressing. In other words, if the embedding position is less than 1/3, the rib stiffness of the stepped portion is low, and if there is a strong input, rib tear may occur. The rigidity will be low. Further, if the depth is less than 1/5, it wears too fast depending on the use conditions, and the early wear rubber disappears. If it exceeds 4/5, excessive force may be applied to the early wear rubber.
【００１０】さらに好ましくは、早期摩耗ゴムの配合組
成を、早期摩耗ゴムの配合組成をトレッドゴムと同じ
く、カーボンブラック配合とし、早期摩耗ゴム側のカー
ボンブラックの粒子径を、トレッドゴムのカーボンブラ
ックの粒子径より大とする。More preferably, the compounding composition of the early wear rubber is the same as that of the tread rubber, and the carbon composition is carbon black. The particle size of the carbon black on the side of the early wear rubber is adjusted to the carbon black of the tread rubber. It is larger than the particle size.
【００１１】[0011]
【発明の実施の形態】以下にこの発明の実施の形態を図
面に示すところに基づいて説明する。図１はこの発明の
実施の形態を示す、トレッドの要部横断面図である。こ
こではトレッド１に、それの周方向に直線状またはジグ
ザグ状に延びる三本の主溝２を形成することで、それら
の主溝間にリブ３を区画するとともに、最外側主溝２と
踏面端との間にショルダリブ４を区画し、各ショルダリ
ブ４の外側域に、それの内側域５に対して段下がりとな
る段差部６を設け、この段差部６の表面７を、タイヤの
負荷転動に当たって路面に滑り接触させる。従って、こ
こにおけるこの段差部表面７は、従来技術で述べた段下
がり表面と同様に、摩耗犠牲部として機能することがで
きる。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a main part of a tread, showing an embodiment of the present invention. Here, three main grooves 2 extending linearly or zigzag in the circumferential direction of the tread 1 are formed on the tread 1, so that the ribs 3 are defined between the main grooves and the outermost main groove 2 and the tread surface are formed. The shoulder ribs 4 are partitioned between the shoulder ribs 4 and the shoulder ribs 4 are provided with a stepped portion 6 which is stepped down with respect to the inside region 5 in the outer region of each shoulder rib 4. It makes sliding contact with the road surface when moving. Therefore, the step surface 7 can function as a wear sacrificing portion, like the step surface described in the related art.
【００１２】またここでは、ショルダリブ外側域の段差
部６で、それとショルダリブ内側域５との隣接部分に、
トレッド１の他の構成部分より耐摩耗性の低い早期摩耗
ゴム８を、周方向に直線状またはジグザグ状に連続させ
て埋め込み配置するとともに、この早期摩耗ゴム８の表
面を段差部表面７とほぼ等しい面内に位置させる。In this case, the stepped portion 6 in the outer region of the shoulder rib and a portion adjacent to the stepped portion 6 and the inner region 5 of the shoulder rib,
An early wear rubber 8 having lower wear resistance than the other components of the tread 1 is buried and arranged continuously in a linear or zigzag shape in the circumferential direction, and the surface of the early wear rubber 8 is substantially the same as the step surface 7. They are located in the same plane.
【００１３】ここで好ましくは、このような早期摩耗ゴ
ム８の埋め込み中心位置を、ショルダリブの外側縁から
ショルダリブ幅の１／３〜１／２の範囲とし、またそれ
の埋め込み深さ、図では最大深さを、主溝２の深さの１
／５〜４／５の範囲、好ましくは、３／４程度とする。
早期摩耗ゴム８をこのように埋め込んだ場合には、先に
も述べたように、段下がり表面内で、偏摩耗をくいとめ
ることができ、溝をうめたことにより溝底クラックをな
くすることができる。Preferably, the embedding center position of the early wear rubber 8 is in the range of 1/3 to 1/2 of the width of the shoulder rib from the outer edge of the shoulder rib, and the embedding depth thereof, the maximum in the figure. The depth is set to 1 of the depth of the main groove 2.
/ 5/4/4, preferably about 3/4.
When the early wear rubber 8 is embedded in this way, as described above, uneven wear can be reduced in the stepped surface, and the groove bottom can be eliminated by filling the groove. it can.
【００１４】そしてさらに、トレッドゴムが、従来から
一般的に用いられている耐摩耗性が良いゴム組成物から
なる場合には、前記早期摩耗ゴム８は、トレッドゴム対
比耐摩耗性が落ちるゴム組成物にて構成することが、摩
耗差を生じやすくする観点から好適である。Further, when the tread rubber is made of a rubber composition which has been generally used and has good abrasion resistance, the early wear rubber 8 has a rubber composition having a lower abrasion resistance than the tread rubber. It is preferable to use an object from the viewpoint of easily causing a difference in wear.
【００１５】以上のように構成してなるタイヤによれ
ば、早期摩耗ゴム８をも含む段差部６に、タイヤの負荷
転動に際する引摺り摩耗を積極的に発生させてそこに偏
摩耗を封じこめることで、ショルダリブ４からトレッド
中央部側への偏摩耗の進行を有効に抑制することができ
る。According to the tire constructed as described above, the stepped portion 6 including the early wear rubber 8 positively generates drag wear at the time of load rolling of the tire, and uneven wear there. , It is possible to effectively suppress the progress of uneven wear from the shoulder ribs 4 toward the tread center.
【００１６】しかもここでは、ショルダリブ４の内側域
５と段差部６との境界部分に作用する応力を、弾性率の
低い早期摩耗ゴム８によって緩和することができるの
で、そこへのクラック等の故障の発生のおそれを十分に
除去することができる。Moreover, in this case, the stress acting on the boundary between the inner region 5 of the shoulder rib 4 and the stepped portion 6 can be reduced by the early wear rubber 8 having a low elastic modulus. Can be sufficiently removed.
【００１７】[0017]
【実施例】サイズが２９５／８０ Ｒ２２．５のタイヤ
を、適用リムに組付けるとともに、最高空気圧を充填し
て、３１５０ｋｇｆ／本の荷重の作用下で１０００００
ｋｍ走行させたところ、図１に示すトレッド構造を有す
る実施例タイヤでは、段差部６とショルダリブ内側域５
との境界部分への故障の発生は認められなかった。ちな
みにここでは、トレッドゴムの配合組成を、ＮＲ／ＢＲ
を６０／４０、Ｃ／Ｂ ＳＡＦ５０、オイルなし、亜鉛
華３．５、硫黄１．０、加硫促進剤１．３ｐｈｒとし、
早期摩耗ゴムの配合組成を、ＮＲ１００、Ｃ／Ｂ ＩＳ
ＡＦ４０、オイル５、亜鉛華３．５、硫黄１．０、加硫
促進剤１．３ｐｈｒとした。ところで、ここにおけるカ
ーボンブラックつき、ＳＡＦは粒子径が１１〜１９ｎｍ
のものを、そして、ＩＳＡＦは粒子径が２０〜２５ｎｍ
のものをそれぞれ示す。なおここでは、早期摩耗ゴム８
の表面は、段差部表面７に対して初期は同じであるが、
走行するにつれて段差部表面より常に速く摩耗した。DESCRIPTION OF THE PREFERRED EMBODIMENTS A tire having a size of 295/80 R22.5 is mounted on an applicable rim, filled with a maximum air pressure, and subjected to a load of 3150 kgf / pound to 100,000.
After running for km, the example tire having the tread structure shown in FIG.
No failure was found at the boundary between the two. Incidentally, here, the compounding composition of the tread rubber is NR / BR
60/40, C / B SAF50, no oil, zinc white 3.5, sulfur 1.0, vulcanization accelerator 1.3 phr,
NR100, C / B IS
AF40, oil 5, zinc white 3.5, sulfur 1.0, and vulcanization accelerator 1.3 phr. By the way, here, with carbon black, SAF has a particle diameter of 11 to 19 nm.
And ISAF has a particle size of 20-25 nm
Are shown below. Here, the early wear rubber 8
Is initially the same as the step surface 7,
As it traveled, it was always worn faster than the surface of the step.
【００１８】これに対し、図１に示すところから早期摩
耗ゴム８を省いたトレッド構造を有する比較タイヤで
は、５０００ｋｍ走行したところで、境界溝への溝底ク
ラックの発生が認められた。On the other hand, as shown in FIG. 1, in the comparative tire having the tread structure in which the early wear rubber 8 was omitted, a crack at the boundary groove was found to occur in the boundary groove after traveling 5000 km.
【００１９】[0019]
【発明の効果】かくして、この発明によれば、ショルダ
リブの外側域の段差部と内側域との境界部分に生じる応
力を、早期摩耗ゴムによって緩和することで、その境界
部分へのクラック等の故障の発生を有効に防止すること
ができる。As described above, according to the present invention, the stress generated at the boundary between the step portion in the outer region of the shoulder rib and the inner region is alleviated by the early wear rubber, so that a failure such as a crack at the boundary can be achieved. Can be effectively prevented.
【図１】この発明の実施の形態を示す、トレッドの要部
横断面図である。FIG. 1 is a cross-sectional view of a main part of a tread, showing an embodiment of the present invention.
１ トレッド ２ 主溝 ３ リブ ４ ショルダリブ ５ 内側域 ６ 段差部 ７ 表面 ８ 早期摩耗ゴム DESCRIPTION OF SYMBOLS 1 Tread 2 Main groove 3 Rib 4 Shoulder rib 5 Inner area 6 Step part 7 Surface 8 Early wear rubber
Claims (3)
の主溝と、これらの主溝によってトレッド幅方向に区分
されたリブとを具え、トレッド幅方向の最も外側に位置
するショルダリブの外側域に、ショルダリブの内側域に
対して段下がりとなる段差部を設け、この段差部の表面
を、荷重の作用下で路面に滑り接触させる空気入りタイ
ヤにおいて、 前記段差部内で、それとショルダリブの内側域との隣接
部分に、トレッドの他の構成部分より耐摩耗性の低い早
期摩耗ゴムを埋め込み配置し、この早期摩耗ゴムの表面
を段差部のそれとほぼ等しい面内に位置させてなる空気
入りタイヤ。1. An outer region of a shoulder rib positioned outermost in a tread width direction, comprising a plurality of main grooves continuously extending in a tread circumferential direction, and ribs divided by the main grooves in a tread width direction. In the pneumatic tire which is provided with a stepped portion which is stepped down with respect to the inner region of the shoulder rib, and the surface of the stepped portion is slidably brought into contact with the road surface under the action of a load, the inside of the stepped portion and the inner region of the shoulder rib are provided. A pneumatic tire having an early wear rubber having lower wear resistance than other components of the tread embedded in an adjacent portion of the tread, and a surface of the early wear rubber is located in a plane substantially equal to that of the step portion.
ョルダリブの外側縁からショルダリブ幅の１／３〜１／
２の範囲とするとともに、埋め込み深さを主溝深さの１
／５〜４／５の範囲としてなる請求項１に記載の空気入
りタイヤ。2. The center of embedding of the premature wear rubber is set at a distance from the outer edge of the shoulder rib to 1/3 to 1/1 of the shoulder rib width.
2 and the embedding depth is 1 of the main groove depth.
The pneumatic tire according to claim 1, wherein the pneumatic tire has a range of / 5 to 4/5.
と同じく、カーボンブラック配合とし、早期摩耗ゴム側
のカーボンブラックの粒子径を、トレッドゴムのカーボ
ンブラックの粒子径より大としてなる請求項１もしくは
２に記載の空気入りタイヤ。3. The compound of the early wear rubber, wherein the compound composition of the tread rubber is carbon black, and the particle size of the carbon black on the side of the early wear rubber is larger than the particle size of the carbon black of the tread rubber. 3. The pneumatic tire according to 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10332866A JP2000158913A (en) | 1998-11-24 | 1998-11-24 | Pneumatic tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10332866A JP2000158913A (en) | 1998-11-24 | 1998-11-24 | Pneumatic tire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000158913A true JP2000158913A (en) | 2000-06-13 |
Family
ID=18259686
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10332866A Withdrawn JP2000158913A (en) | 1998-11-24 | 1998-11-24 | Pneumatic tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000158913A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004110789A1 (en) * | 2003-06-16 | 2004-12-23 | Societe De Technologie Michelin | Protective element for a tread |
| JP2005067387A (en) * | 2003-08-25 | 2005-03-17 | Yokohama Rubber Co Ltd:The | Pneumatic radial tire |
| JP2010208505A (en) * | 2009-03-10 | 2010-09-24 | Bridgestone Corp | Tire |
| CN102632771A (en) * | 2012-04-27 | 2012-08-15 | 青岛中海援救生设备有限公司 | Tire |
| EP2581238A1 (en) * | 2011-10-14 | 2013-04-17 | Sumitomo Rubber Industries, Ltd. | Heavy duty tire |
| JP2014037237A (en) * | 2013-11-27 | 2014-02-27 | Bridgestone Corp | Tire |
| CN108116166A (en) * | 2016-11-29 | 2018-06-05 | 东洋橡胶工业株式会社 | Pneumatic tire |
-
1998
- 1998-11-24 JP JP10332866A patent/JP2000158913A/en not_active Withdrawn
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004110789A1 (en) * | 2003-06-16 | 2004-12-23 | Societe De Technologie Michelin | Protective element for a tread |
| JP2006527686A (en) * | 2003-06-16 | 2006-12-07 | ソシエテ ド テクノロジー ミシュラン | Tread protection element |
| JP2005067387A (en) * | 2003-08-25 | 2005-03-17 | Yokohama Rubber Co Ltd:The | Pneumatic radial tire |
| JP2010208505A (en) * | 2009-03-10 | 2010-09-24 | Bridgestone Corp | Tire |
| EP2581238A1 (en) * | 2011-10-14 | 2013-04-17 | Sumitomo Rubber Industries, Ltd. | Heavy duty tire |
| CN103042885A (en) * | 2011-10-14 | 2013-04-17 | 住友橡胶工业株式会社 | Heavy duty tire |
| CN102632771A (en) * | 2012-04-27 | 2012-08-15 | 青岛中海援救生设备有限公司 | Tire |
| JP2014037237A (en) * | 2013-11-27 | 2014-02-27 | Bridgestone Corp | Tire |
| CN108116166A (en) * | 2016-11-29 | 2018-06-05 | 东洋橡胶工业株式会社 | Pneumatic tire |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20060207 |