JP3108888B2 - Pneumatic tire - Google Patents

Pneumatic tire

Info

Publication number
JP3108888B2
JP3108888B2 JP03239666A JP23966691A JP3108888B2 JP 3108888 B2 JP3108888 B2 JP 3108888B2 JP 03239666 A JP03239666 A JP 03239666A JP 23966691 A JP23966691 A JP 23966691A JP 3108888 B2 JP3108888 B2 JP 3108888B2
Authority
JP
Japan
Prior art keywords
tire
circumferential direction
sub
block
groove
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.)
Expired - Fee Related
Application number
JP03239666A
Other languages
Japanese (ja)
Other versions
JPH0577612A (en
Inventor
豊 深澤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yokohama Rubber Co Ltd
Original Assignee
Yokohama Rubber Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Yokohama Rubber Co Ltd filed Critical Yokohama Rubber Co Ltd
Priority to JP03239666A priority Critical patent/JP3108888B2/en
Publication of JPH0577612A publication Critical patent/JPH0577612A/en
Application granted granted Critical
Publication of JP3108888B2 publication Critical patent/JP3108888B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • B60C11/0318—Tread patterns irregular patterns with particular pitch sequence
    • 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

Landscapes

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

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【産業上の利用分野】本発明は、トレッド部の偏摩耗を
防止しながらタイヤ騒音を低減させるようにした空気入
りタイヤに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic tire which reduces tire noise while preventing uneven wear of a tread portion.

【０００２】[0002]

【従来の技術】一般にタイヤが路面を走行するときに発
生するタイヤ騒音の低減対策としては、バリアブルピッ
チ法が最も多く使用されている。この提案は、タイヤ周
方向に配列されるブロックのピッチを複数種類設け、こ
れらをランダムに配列することにより、各ブロックの路
面に対する打撃に基づく音エネルギーを広い周波数帯に
分散させるようにしたものであった。しかし、このよう
にタイヤ周方向にピッチを異ならせることによりブロッ
ク剛性も変化するので、ピッチの小さいブロックは剛性
が低くなって、ピッチの大きいブロックに比べて摩耗量
が大きくなり、ブロック毎に摩耗量が異なってしまい偏
摩耗が問題化されていた。2. Description of the Related Art In general, the variable pitch method is most frequently used as a measure for reducing tire noise generated when a tire travels on a road surface. This proposal provides a plurality of types of pitches of blocks arranged in the tire circumferential direction, and randomly arranges the blocks so that sound energy based on the impact of each block on the road surface is dispersed in a wide frequency band. there were. However, by changing the pitch in the tire circumferential direction as described above, the block rigidity also changes.Therefore, a small pitch block has a low rigidity, and the amount of wear is larger than that of a large pitch block. The amounts differed and uneven wear was problematic.

【０００３】[0003]

【発明が解決しようとする課題】本発明の目的は、トレ
ッド部の偏摩耗を防止しながらタイヤ騒音を低減させる
ようにした空気入りタイヤを提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a pneumatic tire capable of reducing tire noise while preventing uneven wear of a tread portion.

【０００４】[0004]

【課題を解決するための手段】本発明は、タイヤ踏面
に、タイヤ周方向に延びる複数本の主溝とこの主溝に交
差するタイヤ径方向に延びる複数の副溝とでブロックを
形成した空気入りタイヤにおいて、タイヤ周方向に配列
するブロック列のピッチを実質的に均一にすると共に、
上記踏面に垂直な方向に対する副溝の溝壁角度をタイヤ
周方向に配列するブロック列に対し変化させるようにし
たことを特徴とする。SUMMARY OF THE INVENTION According to the present invention, there is provided a pneumatic tire having a block formed on a tire tread surface by a plurality of main grooves extending in a tire circumferential direction and a plurality of sub-grooves extending in a tire radial direction intersecting the main grooves. In the entering tire, while making the pitch of the block row arranged in the tire circumferential direction substantially uniform,
The groove wall angle of the sub-groove with respect to the direction perpendicular to the tread surface is changed with respect to the block row arranged in the tire circumferential direction.

【０００５】このように、踏面に垂直な方向に対する副
溝の溝壁角度をタイヤ周方向に配列するブロック列に対
し変化させるようにしたため、タイヤ周方向に配列する
各副溝の体積がそれぞれ変化し、ブロックが路面に接地
するときの気柱共鳴音やエアポンピング音をバリアブル
に変化させるので、音エネルギーを広い周波数帯に分散
させることができ、タイヤ騒音を低減することができ
る。また、タイヤ周方向のブロック列のピッチを変化さ
せてないので各ブロック剛性も異なることがなく偏摩耗
の防止が可能になる。As described above, since the groove wall angle of the sub-groove with respect to the direction perpendicular to the tread surface is changed with respect to the block row arranged in the tire circumferential direction, the volume of each sub-groove arranged in the tire circumferential direction changes. However, since the air column resonance sound and the air pumping sound when the block contacts the road surface are varied, sound energy can be dispersed over a wide frequency band, and tire noise can be reduced. In addition, since the pitch of the block row in the tire circumferential direction is not changed, the rigidity of each block does not differ and uneven wear can be prevented.

【０００６】以下、図を参照して本発明につき詳しく説
明する。図１は本発明の実施例からなる空気入りタイヤ
のトレッドパターンの平面図である。タイヤ踏面には、
タイヤ周方向に複数本の主溝２とこの主溝２に交差する
タイヤ径方向の多数の副溝３とが設けられ、これら主溝
２と副溝３に囲まれた多数のブロック１が形成されてい
る。このように形成されたブロック１はタイヤ周方向に
実質的に同一のピッチで配列されている。しかし、副溝
３がタイヤ踏面に垂直な方向に対してなす溝壁角度θ
は、タイヤ周方向のブロック列に対しランダムに変化し
ている。すなわち、図２（Ａ），（Ｂ），（Ｃ）は、図
１のＡ−Ａ断面図、Ｂ−Ｂ断面図、Ｃ−Ｃ断面図である
が、タイヤ周方向に並んだ副溝３の踏面に垂直な方向に
対する溝壁がθA ≠θB ≠θC の関係になってそれぞれ
異なっている。Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view of a tread pattern of a pneumatic tire according to an embodiment of the present invention. On the tire tread,
A plurality of main grooves 2 and a large number of sub-grooves 3 in the tire radial direction intersecting with the main groove 2 are provided in the tire circumferential direction, and a large number of blocks 1 surrounded by the main grooves 2 and the sub-grooves 3 are formed. Have been. The blocks 1 thus formed are arranged at substantially the same pitch in the tire circumferential direction. However, the groove wall angle θ formed by the sub-groove 3 with respect to the direction perpendicular to the tire tread surface
Varies randomly with respect to the block row in the tire circumferential direction. That is, FIGS. 2A, 2B, and 2C are sectional views taken along the line AA, the line BB, and the line CC of FIG. The groove walls in the direction perpendicular to the tread surface are different from each other in the relationship of θA ≠ θB ≠ θC.

【０００７】このように溝壁角度θが異なる副溝同志
は、その溝体積も互いに異なるので、それぞれの副溝が
空気を通過させ或いは一時的に閉じ込める量は異なり、
発生する気柱共鳴音やエアポンピング音が異なったもの
になる。したがって、溝壁角度の異なる副溝がタイヤ周
方向にランダムに配列されていると、タイヤ回転に伴っ
て発生する気柱共鳴音やエアポンピング音は広い周波数
帯域に分散し、タイヤ騒音を低減させるようになる。As described above, the sub-grooves having different groove wall angles θ also have different groove volumes, so that the respective sub-grooves have different amounts of passing air or temporarily confining them.
The generated air column resonance sound and air pumping sound are different. Therefore, when the sub-grooves having different groove wall angles are randomly arranged in the tire circumferential direction, the air column resonance sound and the air pumping sound generated with the rotation of the tire are dispersed in a wide frequency band, and the tire noise is reduced. Become like

【０００８】このようなタイヤ騒音低減効果のためタイ
ヤ周方向に一定ピッチで配置する副溝の溝壁角度の種類
としては、少なくとも３種類以上設けることが好まし
い。また、このように３種類以上の異なる溝壁角度の副
溝は、タイヤ周方向の配列順序を変化させるようにすれ
ば、その配列順序は特に限定されない。また、タイヤ周
方向に対する配列分布が変化している限り、同じ溝壁角
度の副溝がタイヤ周方向に続けて数個並ぶことも差支え
ない。For such a tire noise reduction effect, it is preferable to provide at least three or more types of groove wall angles of sub-grooves arranged at a constant pitch in the tire circumferential direction. In addition, the arrangement order of the auxiliary grooves having three or more different groove wall angles is not particularly limited as long as the arrangement order in the tire circumferential direction is changed. Further, as long as the arrangement distribution in the tire circumferential direction changes, several sub-grooves having the same groove wall angle may be continuously arranged in the tire circumferential direction.

【０００９】一方、上記タイヤは、溝壁角度の異なる副
溝がタイヤ周方向に変化するように分布しているが、タ
イヤ周方向に配列したブロック列のピッチは実質的に同
一にしてあるので、各ブロックの剛性は相互に実質的に
同一となり、その結果偏摩耗を発生することはない。On the other hand, in the above-mentioned tire, the sub-grooves having different groove wall angles are distributed so as to change in the tire circumferential direction, but the pitch of the block rows arranged in the tire circumferential direction is substantially the same. The rigidity of each block is substantially the same as each other, so that uneven wear does not occur.

【００１０】[0010]

【実施例】タイヤサイズが２１５ＳＲ１５で、タイヤ踏
面に設けるブロックパターンを図１のようにし、かつ表
１に示すようにブロック列のピッチを１種類（全体を同
一ピッチ）にすると共に、副溝の溝壁角度θを３種類に
異ならせてタイヤ周方向にランダムに分散させた本発明
タイヤを製作した。一方、同じタイヤサイズの２１５Ｒ
１５で、タイヤ踏面に設けるブロックパターンを図１に
類似するキャラメルブロックパターンにし、かつ図１に
示すようにブロック列のピッチの種類を相互に異なる３
種類にしてタイヤ周方向にランダムに分散させ、副溝の
溝壁角度を１種類（全副溝を同一溝壁角度）だけにした
従来タイヤを製作した。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The tire size is 215SR15, the block pattern provided on the tire tread is as shown in FIG. 1, and as shown in Table 1, the pitch of the block rows is one type (the same pitch as a whole), and The tire of the present invention was manufactured in which the groove wall angles θ were made to be three different types and randomly dispersed in the tire circumferential direction. On the other hand, 215R of the same tire size
At 15, the block pattern provided on the tire tread is a caramel block pattern similar to FIG. 1, and as shown in FIG.
Conventional tires were manufactured in which the types were randomly dispersed in the tire circumferential direction, and the groove wall angles of the sub-grooves were only one type (all sub-grooves have the same groove wall angle).

【００１１】これら本発明タイヤと従来タイヤについ
て、次の試験法によりタイヤが発生する騒音レベルとト
レッド部の耐偏摩耗性とを評価した。 〔騒音レベル〕ＪＡＳＯ Ｃ ６０６に規定の騒音試験
法に従い、速度６０km/hで走行するときの騒音レベルを
測定した。騒音レベルの評価は測定値の逆数を以って行
い、従来タイヤの評価値を１００とする指数で表示し
た。指数が大きいほど騒音レベルが低く、低騒音タイヤ
であることを意味する。With respect to the tire of the present invention and the conventional tire, the noise level generated by the tire and the uneven wear resistance of the tread portion were evaluated by the following test methods. [Noise Level] The noise level when traveling at a speed of 60 km / h was measured in accordance with the noise test method specified in JASO C606. The evaluation of the noise level was performed using the reciprocal of the measured value, and was expressed by an index with the evaluation value of the conventional tire being 100. The larger the index, the lower the noise level, which means that the tire is a low-noise tire.

【００１２】〔耐偏摩耗性〕実車にタイヤを装着し、空
気圧２０kgf/cm2 にて２万km走行後タイヤ周上８箇所の
摩耗量を測定し、そのレンジにて比較した。指数が大き
いほど耐偏摩耗性に優れていることを意味する。[Partial Wear Resistance] A tire was mounted on an actual vehicle, and after running 20,000 km at an air pressure of 20 kgf / cm 2, the amount of wear at eight locations on the tire circumference was measured and compared in the range. The larger the index, the better the uneven wear resistance.

【００１３】 表１から判るように、本発明タイヤは従来タイヤに比較
して耐偏摩耗性が一段と向上しているが、騒音レベルは
従来タイヤとほぼ同じ水準にあることが判る。[0013] As can be seen from Table 1, although the uneven wear resistance of the tire of the present invention is further improved as compared with the conventional tire, it is understood that the noise level is substantially the same as that of the conventional tire.

【００１４】[0014]

【発明の効果】上述したように本発明によれば、タイヤ
周方向のブロック列のピッチを実質的に同一にする一方
で、副溝の踏面に垂直な方向に対する溝壁角度をタイヤ
周方向に配列するブロック列に対し変化させるようにし
たため、各副溝で生ずる音エネルギーを広い周波数帯に
分散させることができ、タイヤ騒音を低減することがで
きる。また、ピッチが実質的同一であるため各ブロック
の剛性が実質的に同じになり、偏摩耗の防止が可能にな
る。As described above, according to the present invention, while making the pitch of the block rows in the tire circumferential direction substantially the same, the groove wall angle with respect to the direction perpendicular to the tread surface of the sub-groove is changed in the tire circumferential direction. Since this is changed for the array of blocks, the sound energy generated in each sub-groove can be dispersed over a wide frequency band, and tire noise can be reduced. In addition, since the pitch is substantially the same, the rigidity of each block is substantially the same, and uneven wear can be prevented.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明の実施例からなる空気入りタイヤのトレ
ッドパターンの平面図である。FIG. 1 is a plan view of a tread pattern of a pneumatic tire according to an embodiment of the present invention.

【図２】（Ａ）は図１におけるＡ−Ａ断面図、（Ｂ）は
同じくＢ−Ｂの断面図、（Ｃ）は同じくＣ−Ｃ断面図で
ある。2A is a sectional view taken along line AA in FIG. 1, FIG. 2B is a sectional view taken along line BB, and FIG. 2C is a sectional view taken along line CC in FIG.

【符号の説明】[Explanation of symbols]

１ ブロック ２ 主溝 ３ 副溝 ４ 壁面 1 block 2 main groove 3 sub groove 4 wall

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】 タイヤ踏面に、タイヤ周方向に延びる複
数本の主溝と該主溝に交差するタイヤ径方向に延びる複
数の副溝とでブロックを形成した空気入りタイヤにおい
て、タイヤ周方向に配列するブロック列のピッチを実質
的に均一にすると共に、前記踏面に垂直な方向に対する
副溝の溝壁角度をタイヤ周方向に配列するブロック列に
対し変化させるようにした空気入りタイヤ。1. A pneumatic tire in which a block is formed on a tire tread surface with a plurality of main grooves extending in a tire circumferential direction and a plurality of sub-grooves extending in a tire radial direction intersecting the main groove. A pneumatic tire wherein the pitch of the arranged block rows is made substantially uniform, and the groove wall angle of the sub-groove with respect to a direction perpendicular to the tread surface is changed with respect to the block rows arranged in the tire circumferential direction.
JP03239666A 1991-09-19 1991-09-19 Pneumatic tire Expired - Fee Related JP3108888B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP03239666A JP3108888B2 (en) 1991-09-19 1991-09-19 Pneumatic tire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP03239666A JP3108888B2 (en) 1991-09-19 1991-09-19 Pneumatic tire

Publications (2)

Publication Number Publication Date
JPH0577612A JPH0577612A (en) 1993-03-30
JP3108888B2 true JP3108888B2 (en) 2000-11-13

Family

ID=17048103

Family Applications (1)

Application Number Title Priority Date Filing Date
JP03239666A Expired - Fee Related JP3108888B2 (en) 1991-09-19 1991-09-19 Pneumatic tire

Country Status (1)

Country Link
JP (1) JP3108888B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6085913B2 (en) * 2012-08-20 2017-03-01 横浜ゴム株式会社 Heavy duty pneumatic tire

Also Published As

Publication number Publication date
JPH0577612A (en) 1993-03-30

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