JP2008105480A - Pneumatic tire - Google Patents

Pneumatic tire Download PDF

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Publication number
JP2008105480A
JP2008105480A JP2006288276A JP2006288276A JP2008105480A JP 2008105480 A JP2008105480 A JP 2008105480A JP 2006288276 A JP2006288276 A JP 2006288276A JP 2006288276 A JP2006288276 A JP 2006288276A JP 2008105480 A JP2008105480 A JP 2008105480A
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Prior art keywords
groove
side wall
main groove
protrusion
pneumatic tire
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JP2006288276A
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JP4970893B2 (en
Inventor
Takashi Fujioka
剛史 藤岡
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Toyo Tire Corp
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Toyo Tire and Rubber Co Ltd
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Priority to JP2006288276A priority Critical patent/JP4970893B2/en
Priority to CN2007101546200A priority patent/CN101168342B/en
Priority to US11/867,824 priority patent/US8100159B2/en
Priority to DE102007048844A priority patent/DE102007048844A1/en
Publication of JP2008105480A publication Critical patent/JP2008105480A/en
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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
    • B60C11/04—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
    • B60C11/045—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 walls having a three-dimensional shape
    • 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
    • B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
    • B60C11/1307—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove walls
    • B60C2011/1338—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping with special features of the groove walls comprising protrusions

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the occurrence of stone-biting, while maintaining drain performance. <P>SOLUTION: This pneumatic tire forms a rib 2 of main grooves 1, by carving three or more of main grooves 1 extending in the tire peripheral direction R. In this pneumatic tire, in a new product, a ridgeline 11 of the main grooves 1 extends in a straight line shape in the tire peripheral direction R, and the groove bottom 12 of the main grooves 1 extends in a zigzag shape in the tire peripheral direction R, and a side wall 13 of the main grooves 1 has a recessed part and a projection part, and a projection 3 connected to the groove bottom 12 of the main grooves 1 and the side wall 13 is provided in the recessed part of the side wall 13 of at least one main groove 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、空気入りタイヤに関し、より詳細には、トラクション性能と排水性能を確保しつつ、タイヤの溝に石が挟まって抜けなくなる、石噛みと呼ばれる現象の発生を抑制した空気入りタイヤに関する。   The present invention relates to a pneumatic tire, and more particularly, to a pneumatic tire that suppresses the occurrence of a phenomenon called stone biting that ensures traction performance and drainage performance and prevents stones from being caught in tire grooves.

排水性能、トラクション性能、制動性能など、所望の性能を得るために、トレッドにはタイヤ周方向に延びる主溝やタイヤ幅方向に延びる横溝が刻まれている。溝内に石が挟まって抜けなくなると、石が溝底方向に徐々に進入し、溝底を損傷することがある。更に、石が進入すると、ベルト層、補助ベルト層を損傷し、故障の原因となりうる。特に主溝は、タイヤ回転による溝の変形が小さいため、このような傾向が強くなる。このような石噛みを防止するため、石が進入しないように主溝の溝底中央に突起（ストーンイジェクタと呼ばれる）を設けた空気入りタイヤが知られている（特許文献１）。   In order to obtain desired performance such as drainage performance, traction performance, braking performance, etc., the tread is engraved with a main groove extending in the tire circumferential direction and a lateral groove extending in the tire width direction. If stones are caught in the groove and cannot be removed, the stone may gradually enter the groove bottom and damage the groove bottom. Furthermore, when stones enter, the belt layer and the auxiliary belt layer may be damaged, causing failure. In particular, the main groove has such a tendency that the deformation of the groove due to tire rotation is small. In order to prevent such stone biting, a pneumatic tire is known in which a protrusion (called a stone ejector) is provided at the center of the bottom of the main groove so that stones do not enter (Patent Document 1).

特開２００２−２９３１１０号公報JP 2002-293110 A

しかしながら、石噛みの発生を十分に防止できる程度の高さの突起を主溝の溝底中央に設けると、主溝の排水性が大きく損なわれる。また、石が進入した際に突起が変形し易いので、突起と溝底との連結部にクラックが発生しやすくなる。そのため、排水性能と石噛みの防止を両立させることは困難であった。   However, if a protrusion having a height that can sufficiently prevent stone biting is provided at the center of the bottom of the main groove, the drainage of the main groove is greatly impaired. Further, since the protrusion is easily deformed when the stone enters, a crack is likely to occur at the connecting portion between the protrusion and the groove bottom. Therefore, it has been difficult to achieve both drainage performance and prevention of stone biting.

したがって、本発明の目的は、排水性能を維持させつつ、石噛み発生を防止することにある。   Accordingly, an object of the present invention is to prevent stone biting while maintaining drainage performance.

上記課題を解決するため、本願発明は、タイヤ周方向に延びる主溝が３本以上刻まれ、前記主溝によりリブが形成された空気入りタイヤにおいて、
新品時における前記主溝の稜線はタイヤ周方向に直線状に延び、前記主溝の溝底はタイヤ周方向にジグザグ上に延び、前記主溝の側壁は凹部と凸部とを備え、少なくとも一方の前記主溝の側壁の凹部に、前記主溝の溝底及び側壁に連結された突起を備えたことを特徴とする空気入りタイヤである。 In order to solve the above problems, the present invention provides a pneumatic tire in which three or more main grooves extending in the tire circumferential direction are cut and ribs are formed by the main grooves.
The ridgeline of the main groove at the time of a new article extends linearly in the tire circumferential direction, the groove bottom of the main groove extends zigzag in the tire circumferential direction, the side wall of the main groove includes a recess and a projection, and at least one of them The pneumatic tire is characterized in that a protrusion connected to the groove bottom and the side wall of the main groove is provided in the concave portion of the side wall of the main groove.

新品時において、主溝はタイヤ周方向に直線状に延びているので、リブの偏摩耗の発生が抑えられる。主溝の溝底はタイヤ周方向にジグザグ状に延びているので、摩耗が進行すると主溝はジグザグ状に延びるため、タイヤのトラクション性能、制動性能が向上する。また、摩耗が進行しトレッド表面に突起が現れると、突起によりトラクション性能や制動性能が向上する。   When new, the main groove extends linearly in the tire circumferential direction, so that the occurrence of uneven wear of the ribs can be suppressed. Since the groove bottom of the main groove extends in a zigzag shape in the tire circumferential direction, the main groove extends in a zigzag shape as wear progresses, so that the traction performance and braking performance of the tire are improved. Further, when wear progresses and protrusions appear on the tread surface, the protrusions improve traction performance and braking performance.

主溝に石が挟まっても突起により、溝底方向への石の進入を阻むことができ、石噛みを防止することができる。また、突起は連続せず間隔をおいて配置されているので、主溝の排水性を損なうことがない。更に、突起は側壁に連結されているため、石が進入しても容易に変形しないので、溝底と突起との連結部にクラックが発生することがない。   Even if a stone is caught in the main groove, the protrusion can prevent the stone from entering in the groove bottom direction and can prevent the stone from being bitten. Further, since the protrusions are not continuous and are arranged at intervals, the drainage of the main groove is not impaired. Further, since the protrusion is connected to the side wall, it does not easily deform even when a stone enters, so that a crack does not occur at the connecting portion between the groove bottom and the protrusion.

本願発明は、前記主溝の両側壁に前記突起を備えている空気入りタイヤである。   The present invention is a pneumatic tire provided with the projections on both side walls of the main groove.

突起を両方の側壁に設けることにより、石噛み防止効果及び摩耗進行時のトラクション性能や制動性能が向上する。   By providing the protrusions on both side walls, the stone biting prevention effect and the traction performance and braking performance during wear progress are improved.

本願発明は、前記突起の溝底からの高さＨは、前記主溝の深さＤの１０％〜４０％である空気入りタイヤである。   The present invention is a pneumatic tire in which a height H from the groove bottom of the protrusion is 10% to 40% of a depth D of the main groove.

突起の溝底からの高さＨが主溝の深さＤの１０％未満であると石噛み抑制効果が低いことがあり、４０％を超えると主溝の排水性能を損なうことがある。   If the height H from the groove bottom of the protrusion is less than 10% of the depth D of the main groove, the stone biting suppression effect may be low, and if it exceeds 40%, the drainage performance of the main groove may be impaired.

本願発明は、前記溝底における、前記突起から対向する前記側壁までの距離Ｗ１、前記溝底における、隣接する前記突起の間隔Ｗ２の内、大きい値は小さい値の２．０倍以下であり、
Ｗ１とＷ２の内、小さい値は、前記突起を除いたときの前記溝底における溝幅Ｗの５０％〜７０％である空気入りタイヤである。 The present invention is such that, in the groove bottom, the distance W1 from the protrusion to the opposite side wall, and the gap bottom W2 between the adjacent protrusions in the groove bottom, the larger value is 2.0 times or less the smaller value,
Among W1 and W2, a small value is a pneumatic tire that is 50% to 70% of the groove width W at the groove bottom when the protrusion is removed.

主溝の排水性の確保の観点から、突起から対向する側壁までの距離Ｗ１、隣接する前記突起の間隔Ｗ２を所定の範囲にするものである。   From the viewpoint of securing the drainability of the main groove, the distance W1 from the protrusion to the opposite side wall and the interval W2 between the adjacent protrusions are set within a predetermined range.

本願発明は、前記突起の前記側壁に遠い側の周方向長さＬ２は、前記側壁に近い側の周方向長さＬ１より短い空気入りタイヤである。   The present invention is a pneumatic tire in which a circumferential length L2 on the side farther from the side wall of the protrusion is shorter than a circumferential length L1 on the side closer to the side wall.

主溝の排水性の確保の観点から、突起の側壁に遠い側の周方向長さＬ２を側壁に近い側の周方向長さＬ１より短くすることが好ましい。   From the viewpoint of securing the drainability of the main groove, it is preferable that the circumferential length L2 on the side far from the side wall of the protrusion is shorter than the circumferential length L1 on the side near the side wall.

以下、図面を用いて、本発明に係る空気入りタイヤの実施の形態を説明する。図１は、新品時のトレッドパターンを示す概略図である。図において、タイヤ周方向Ｒに延びる主溝１によりリブ２が形成されている。新品時における主溝１の稜線１１はタイヤ周方向Ｒに直線状に延びている。一方、主溝１の溝底１２はタイヤ周方向Ｒにジグザグ状に延びている。その結果、新品時から摩耗初期においてリブ２の偏摩耗の発生が抑えられる。その後、主溝１はジグザグ状に延びるため、タイヤのトラクション性能、制動性能が向上する。   Hereinafter, an embodiment of a pneumatic tire according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing a tread pattern when new. In the figure, a rib 2 is formed by a main groove 1 extending in the tire circumferential direction R. The ridgeline 11 of the main groove 1 at the time of a new article extends linearly in the tire circumferential direction R. On the other hand, the groove bottom 12 of the main groove 1 extends in a zigzag shape in the tire circumferential direction R. As a result, the occurrence of uneven wear of the ribs 2 can be suppressed from the new article to the early stage of wear. Thereafter, since the main groove 1 extends in a zigzag shape, the traction performance and braking performance of the tire are improved.

図２は、主溝の一部を示す斜視図である。主溝１の側壁１３は、凹部１４と凸部１５とを交互に備えている。凹部１４には、主溝１の溝底１２及び側壁１３に連結された突起３を備えている。したがって、仮に主溝１に石が挟まっても突起３により、溝底方向への石の進入を阻むことができ、石噛みを防止することができる。また、突起３は連続せず間隔をおいて配置されているので、主溝１の排水性を損なうことがない。   FIG. 2 is a perspective view showing a part of the main groove. The side wall 13 of the main groove 1 is provided with concave portions 14 and convex portions 15 alternately. The recess 14 includes a protrusion 3 connected to the groove bottom 12 and the side wall 13 of the main groove 1. Therefore, even if a stone is caught in the main groove 1, the protrusion 3 can prevent the stone from entering in the groove bottom direction and can prevent the stone from biting. Moreover, since the protrusions 3 are not continuous but are arranged at intervals, the drainage performance of the main groove 1 is not impaired.

突起３は側壁１３に連結されているので、溝底１２と突起３との連結部にクラックが発生することがない。摩耗が進行しトレッド表面に突起３が現れると、突起３によりトラクション性能や制動性能が向上する。なお、突起３は、少なくとも一方の側壁１３にあればよいが、両方の側壁１３に設けてもよい。   Since the protrusion 3 is connected to the side wall 13, no crack is generated at the connecting portion between the groove bottom 12 and the protrusion 3. When the wear progresses and the protrusion 3 appears on the tread surface, the protrusion 3 improves the traction performance and braking performance. The protrusion 3 may be provided on at least one side wall 13, but may be provided on both side walls 13.

図３は、図１のＡ−Ａ線断面図である。突起３の溝底１２からの高さＨは、主溝１の深さＤの１０％〜４０％が好ましい。高さＨが深さＤの１０％未満であると石噛み抑制効果が低いことがあり、４０％を超えると主溝１の排水性能を損なうことがある。   3 is a cross-sectional view taken along line AA in FIG. The height H of the protrusion 3 from the groove bottom 12 is preferably 10% to 40% of the depth D of the main groove 1. If the height H is less than 10% of the depth D, the stone biting suppression effect may be low, and if it exceeds 40%, the drainage performance of the main groove 1 may be impaired.

図４は、主溝の溝底を示す拡大図であり、溝底１２には斜線を施している。Ｗ１は、溝底１２における、突起３から対向する側壁１３までの距離である。Ｗ２は、溝底１２における、隣接する突起３の間隔である。十分な排水性能を確保するためには、溝底１２の幅に急激な変化がないことが必要である。したがって、Ｗ１とＷ２の内の小さい値に対して、大きい値は２．０倍以下であることが好ましい。図３では、Ｗ２がＷ１より大きいが、突起３の大きさにより、Ｗ１が大きくなったり、Ｗ２が大きくなったりする。   FIG. 4 is an enlarged view showing the groove bottom of the main groove, and the groove bottom 12 is hatched. W1 is the distance from the protrusion 3 to the opposite side wall 13 at the groove bottom 12. W2 is an interval between adjacent protrusions 3 in the groove bottom 12. In order to ensure sufficient drainage performance, it is necessary that there is no sudden change in the width of the groove bottom 12. Therefore, it is preferable that the larger value is 2.0 times or less than the smaller value of W1 and W2. In FIG. 3, W2 is larger than W1, but W1 increases or W2 increases depending on the size of the protrusion 3.

また、突起３を除いたときの溝底１２における溝幅をＷとすると、Ｗ１とＷ２の内の小さい値は、Ｗの５０％〜７０％が好ましい。５０％未満であると排水性能を損なうことがあり、７０％を超えると突起３が小さいため石噛みの防止ができないことがある。更に、排水性の確保の観点から、突起３の側壁１３に遠い側の周方向長さをＬ２、側壁１３に近い側の周方向長さＬ１とすると、Ｌ１がＬ２より短くすることが好ましい。   When the groove width at the groove bottom 12 when the protrusion 3 is removed is W, the smaller value of W1 and W2 is preferably 50% to 70% of W. If it is less than 50%, the drainage performance may be impaired, and if it exceeds 70%, the protrusion 3 is small, and stone biting may not be prevented. Furthermore, from the viewpoint of ensuring drainage, if the circumferential length on the side farther from the side wall 13 of the protrusion 3 is L2, and the circumferential length L1 on the side closer to the side wall 13, L1 is preferably shorter than L2.

実施例として本発明に係る空気入りタイヤを試作し、積載荷重１０トンのトラック（車軸構成は２−Ｄ）に装着して評価を行なった。なお、トレッドパターンは図１に示したパターンである。主溝１の深さＤは１４．５ｍｍ、突起３の高さＨは３ｍｍ、図４におけるＷ、Ｗ１、Ｗ２はそれぞれ７ｍｍ、４．５ｍｍ、６．５ｍｍ、Ｌ１、Ｌ２はそれぞれ２３ｍｍ、１７ｍｍであった。   As an example, a pneumatic tire according to the present invention was prototyped and mounted on a truck having a load of 10 tons (the axle configuration is 2-D) for evaluation. The tread pattern is the pattern shown in FIG. The depth D of the main groove 1 is 14.5 mm, the height H of the protrusion 3 is 3 mm, W, W1, and W2 in FIG. 4 are 7 mm, 4.5 mm, 6.5 mm, and L1 and L2 are 23 mm and 17 mm, respectively. there were.

従来例１のタイヤは、実施例と同じパターンを有するが突起を備えていないタイヤである。従来例２のタイヤは、実施例と同じパターンを有するが溝底も直線状に延びており、溝底中央に幅３ｍｍ、高さ３ｍｍ、周方向長さ６ｍｍの突起が間隔２ｍｍで配置されたタイヤである。また、タイヤのサイズは１１Ｒ２２．５、装着リムサイズは、２２．５×７．５０、設定内圧は７００ｋＰａとした。   The tire of Conventional Example 1 is a tire having the same pattern as that of the example but not having a protrusion. The tire of Conventional Example 2 has the same pattern as that of the example, but the groove bottom also extends linearly, and protrusions having a width of 3 mm, a height of 3 mm, and a circumferential length of 6 mm are arranged at intervals of 2 mm in the center of the groove. Tire. The tire size was 11R22.5, the mounting rim size was 22.5 × 7.50, and the set internal pressure was 700 kPa.

表１によれば、本願発明のタイヤでは、排水性能を維持させつつ、石噛み発生を防止でき、しかも摩耗時のトラクション性能を向上させることができた。なお、表１に示す各項目の評価方法は以下のとおりである。いずれも従来例１を１００とした指数で、数値が大きいほど性能が良いことを示す。
（１）排水性能
時速５０ｋｍから徐々に速度を上げて水深３ｍｍの湿潤路面を走行し、ハイドロプレーニング現象が発生したとき（ハンドルの手応えの変化が感じられたとき）の速度を示し、５人のドライバーによる平均値である。
（２）トラクション性能
乾燥路面での時速６０ｋｍからの制動距離である。制動距離が短いことは、トラクション性能が良いことを示す。
（３）石噛み防止性能
一般道路を１０，０００ｋｍ走行した後、主溝内に挟まった石の個数を計測した。 According to Table 1, in the tire of the present invention, it was possible to prevent the occurrence of stone biting while maintaining the drainage performance, and to improve the traction performance during wear. In addition, the evaluation method of each item shown in Table 1 is as follows. Each is an index with the conventional example 1 as 100, and the larger the value, the better the performance.
(1) Drainage performance The speed is gradually increased from 50km / h on a wet road surface with a depth of 3mm, and when hydroplaning occurs (when a change in steering response is felt) The average value by the driver.
(2) Traction performance This is the braking distance from 60 km / h on a dry road surface. A short braking distance indicates good traction performance.
(3) Stone biting prevention performance After traveling 10,000 km on a general road, the number of stones caught in the main groove was measured.

Figure 2008105480
Figure 2008105480

本発明に係る空気入りタイヤの新品時のトレッドパターンを示す概略図である。It is the schematic which shows the tread pattern at the time of the new article of the pneumatic tire which concerns on this invention. 主溝の一部を示す斜視図である。It is a perspective view which shows a part of main groove. 図１のＡ−Ａ線断面図である。It is the sectional view on the AA line of FIG. 主溝の溝底を示す拡大図である。It is an enlarged view which shows the groove bottom of a main groove.

符号の説明Explanation of symbols

１ 主溝
２ リブ
３ 突起
１１ 主溝の稜線
１２ 主溝の溝底
１３ 主溝の側壁
１４ 主溝の側壁の凹部
１５ 主溝の側壁の凸部 DESCRIPTION OF SYMBOLS 1 Main groove 2 Rib 3 Protrusion 11 Main groove ridge line 12 Main groove groove bottom 13 Main groove side wall 14 Main groove side wall concave part 15 Main groove side wall convex part

Claims (5)

タイヤ周方向に延びる主溝が３本以上刻まれ、前記主溝によりリブが形成された空気入りタイヤにおいて、
新品時における前記主溝の稜線はタイヤ周方向に直線状に延び、前記主溝の溝底はタイヤ周方向にジグザグ上に延び、前記主溝の側壁は凹部と凸部とを備え、少なくとも一方の前記主溝の側壁の凹部に、前記主溝の溝底及び側壁に連結された突起を備えたことを特徴とする空気入りタイヤ。 In a pneumatic tire in which three or more main grooves extending in the tire circumferential direction are cut and ribs are formed by the main grooves,
The ridgeline of the main groove at the time of a new article extends linearly in the tire circumferential direction, the groove bottom of the main groove extends zigzag in the tire circumferential direction, the side wall of the main groove includes a recess and a projection, and at least one of them A pneumatic tire characterized in that a protrusion connected to a groove bottom and a side wall of the main groove is provided in a recess of the side wall of the main groove. 前記主溝の両側壁に前記突起を備える請求項１に記載の空気入りタイヤ。   The pneumatic tire according to claim 1, wherein the protrusions are provided on both side walls of the main groove. 前記突起の溝底からの高さＨは、前記主溝の深さＤの１０％〜４０％である請求項１又は２に記載の空気入りタイヤ。   The pneumatic tire according to claim 1 or 2, wherein a height H of the protrusion from the groove bottom is 10% to 40% of a depth D of the main groove. 前記溝底における、前記突起から対向する前記側壁までの距離Ｗ１、前記溝底における、隣接する前記突起の間隔Ｗ２の内、大きい値は小さい値の２．０倍以下であり、
Ｗ１とＷ２の内の小さい値は、前記突起を除いたときの前記溝底における溝幅Ｗの５０％〜７０％である請求項１乃至３のいずれかに記載の空気入りタイヤ。 Of the distance W1 from the protrusion to the opposite side wall at the groove bottom, and the interval W2 between the adjacent protrusions at the groove bottom, the larger value is 2.0 times the smaller value,
4. The pneumatic tire according to claim 1, wherein a small value of W <b> 1 and W <b> 2 is 50% to 70% of a groove width W at the groove bottom when the protrusion is removed. 前記突起の前記側壁に遠い側の周方向長さＬ２は、前記側壁に近い側の周方向長さＬ１より短い請求項１乃至４のいずれかに記載の空気入りタイヤ。   5. The pneumatic tire according to claim 1, wherein a circumferential length L <b> 2 of the projection far from the side wall is shorter than a circumferential length L <b> 1 near the side wall.
JP2006288276A 2006-10-24 2006-10-24 Pneumatic tire Active JP4970893B2 (en)

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US11/867,824 US8100159B2 (en) 2006-10-24 2007-10-05 Pneumatic tire with circumferential main grooves having protrusions
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