JPH04244402A - Neumatic tire with reduced noise - Google Patents
Neumatic tire with reduced noiseInfo
- Publication number
- JPH04244402A JPH04244402A JP3029274A JP2927491A JPH04244402A JP H04244402 A JPH04244402 A JP H04244402A JP 3029274 A JP3029274 A JP 3029274A JP 2927491 A JP2927491 A JP 2927491A JP H04244402 A JPH04244402 A JP H04244402A
- Authority
- JP
- Japan
- Prior art keywords
- grooves
- pitch
- tread
- circumferential
- lateral
- 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.)
- Pending
Links
- 239000011295 pitch Substances 0.000 claims description 58
- 238000005299 abrasion Methods 0.000 abstract 1
- 238000005086 pumping Methods 0.000 abstract 1
- 238000000465 moulding Methods 0.000 description 2
- 238000004073 vulcanization Methods 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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
-
- 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
- B60C2011/0337—Tread patterns characterised by particular design features of the pattern
- B60C2011/0339—Grooves
- B60C2011/0358—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane
- B60C2011/0367—Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane characterised by depth
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】この発明は、タイヤ騒音、中でも
パターンノイズの低いトレッドパターンをそなえる空気
入りタイヤに関する。タイヤ騒音は様々な原因によって
発生し、中でもトレッドパターンに起因した、いわゆる
パターンノイズの占める比率は大きい。このパターンノ
イズは、トレッド接地面と路面との間で圧縮された空気
がトレッドの溝を介してトレッド接地面の外側に急激に
流出し、この現象が断続して起こるために生じるノイズ
で、ポンピングノイズとも呼ばれる。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic tire having a tread pattern with low tire noise, particularly low pattern noise. Tire noise is generated by various causes, and among them, so-called pattern noise caused by the tread pattern accounts for a large proportion. This pattern noise is caused by the air compressed between the tread contact surface and the road surface rapidly flowing out to the outside of the tread contact surface through the tread grooves, and this phenomenon occurs intermittently. Also called noise.
【０００２】0002
【従来の技術】このパターンノイズは、トレッドパター
ンにいわゆるピッチバリエーションを付与することで低
減可能である。すなわちタイヤトレッドの周溝及びこれ
を横切る横溝で区画されたブロックに該ブロックの対辺
をなす一方の横溝を含めた構成単位を一般にピッチと称
し、横溝の幅及びブロックの周方向長さの異なる複数種
（通常の乗用車用タイヤで３〜５種）のピッチをランダ
ムに又は一定の規則性をもたせて配列することによって
、パターンノイズを低減するものである。2. Description of the Related Art Pattern noise can be reduced by imparting so-called pitch variations to the tread pattern. In other words, a structural unit including one lateral groove on the opposite side of the block divided by the circumferential groove of the tire tread and the lateral groove that crosses this is generally called a pitch, and a plurality of blocks with different widths of the lateral grooves and lengths in the circumferential direction of the block are generally referred to as pitches. Pattern noise is reduced by arranging the pitches of seeds (3 to 5 types in a typical passenger car tire) randomly or with a certain regularity.
【０００３】0003
【発明が解決しようとする課題】しかしながらこのピッ
チバリエーションを導入すると、ブロックにおけるタイ
ヤ踏み込み時の面圧が長いピッチのブロックで大きくか
つ短いピッチのブロックで小さくなるため、タイヤ転動
時の路面とブロックとの衝突音が不均一化して騒音を助
長し、また多角形摩耗に代表される偏摩耗の核となると
ころに、新たな問題が発生していた。そこでこの発明は
、パターンノイズの低いピッチバリエーションを導入し
たブロックパターンにおける各ブロック間での面圧を均
一化し得るトレッド構造について提案することを目的と
する。[Problem to be Solved by the Invention] However, when this pitch variation is introduced, the surface pressure when the tire is pressed into the block is large for blocks with a long pitch and small for blocks with a short pitch. The sound of the collision with the bearing becomes uneven, which increases the noise, and a new problem has arisen in areas that are the core of uneven wear, as typified by polygonal wear. Therefore, an object of the present invention is to propose a tread structure that can equalize the surface pressure between each block in a block pattern that introduces pitch variations with low pattern noise.
【０００４】0004
【課題を解決するための手段】この発明は、１対のサイ
ドウォール間にまたがってトロイダル状に連なるトレッ
ドに、このトレッド円周に沿って延びる複数の周溝及び
これら周溝を横切る向きで延びる多数の横溝にて区画さ
れる縦列ブロック群をそなえ、さらに該ブロック群の各
ブロックにおいて対辺をなす横溝の一方を含むブロック
の周方向長さで定義されるピッチにつき、複数の長さの
ピッチを組合わせて縦列ブロック群を配列した空気入り
タイヤにおいて、短いピッチに属する横溝の深さを、長
いピッチに属する横溝の深さより浅くしてなる騒音を低
減した空気入りタイヤである。[Means for Solving the Problems] The present invention provides a tread that extends in a toroidal manner between a pair of sidewalls, has a plurality of circumferential grooves extending along the circumference of the tread, and extends in a direction crossing these circumferential grooves. It has a group of vertical blocks partitioned by a large number of horizontal grooves, and furthermore, each block in the block group has a pitch defined by the circumferential length of the block including one of the horizontal grooves forming the opposite side, and a pitch of a plurality of lengths. This pneumatic tire has reduced noise by making the depth of lateral grooves belonging to short pitches shallower than the depth of lateral grooves belonging to long pitches in a pneumatic tire in which vertical block groups are arranged in combination.
【０００５】さて図１にこの発明に従う空気入りタイヤ
のトレッド要部を示し、このトレッドを、トレッドの中
央周線Ｏ上で延びる中央周溝１、また中央周線Ｏに沿っ
て延びそれぞれ中央周線Ｏの両側で対をなす周溝２ａ，
２ｂ 及び３ａ，３ｂ 、さらにこれら周溝を横切る向
きに延びて各周溝間又は周溝３ａ，３ｂ 及びトレッド
端Ｔ間をつなぐ横溝４ａ，４ｂ 及び５ａ，５ｂ によ
って、中央周溝１の両側にリブ６ａ，６ｂ を区画し、
さらにそのトレッド端側にそれぞれ片側に２列両側で４
列の縦列ブロック群７〜１０を区画してなる。なお１１
は補助周溝である。なおこの実施例において横溝４及び
５はリブ６の一側に設けた切欠きＫと関連しトレッド端
Ｔへ矢筈状に配列しており、そのためタイヤの回転方向
は矢印Ａに指定される。Now, FIG. 1 shows the main part of the tread of a pneumatic tire according to the present invention. Peripheral grooves 2a forming a pair on both sides of the line O,
2b, 3a, 3b, and lateral grooves 4a, 4b and 5a, 5b that extend in a direction across these circumferential grooves and connect between each circumferential groove or between the circumferential grooves 3a, 3b and the tread edge T, on both sides of the central circumferential groove 1. partitioning the ribs 6a and 6b,
Furthermore, on the tread end side, there are two rows on each side and four rows on both sides.
It is formed by dividing vertical block groups 7 to 10 of the column. Note 11
is the auxiliary circumferential groove. In this embodiment, the lateral grooves 4 and 5 are arranged in a herringbone shape toward the tread end T in association with a notch K provided on one side of the rib 6, so that the direction of rotation of the tire is designated by arrow A.
【０００６】これら縦列ブロック群７〜１０は所定のピ
ッチバリエーションに従って複数のピッチの組合わせで
配列し、すなわち隣接する一方の横溝を含む各ブロック
の周方向長さを複数の長さのピッチに従って変化する。
導入するピッチバリエーションは周方向長さの異なるピ
ッチＰ１ 〜Ｐ４ の４種（Ｐ１ ＞Ｐ２ ＞Ｐ３ ＞
Ｐ４ ）で、これらのピッチに対応して各縦列ブロック
群を４種のブロック長のブロック及び４種の幅の横溝か
ら構成する。例えば縦列ブロック群９を代表として説明
すると、ピッチＰ１ に対応するのはブロック９ａとこ
れに隣接する横溝５ａで、同様にしてピッチＰ２ にブ
ロック９ｂとこれに隣接する横溝５ａ、ピッチＰ３ に
ブロック９ｃとこれに隣接する横溝５ａ、そしてピッチ
Ｐ４ にブロック９ｄとこれに隣接する横溝５ａがそれ
ぞれ対応する。These vertical block groups 7 to 10 are arranged in a plurality of pitch combinations according to predetermined pitch variations, that is, the circumferential length of each block including one adjacent horizontal groove is varied according to a plurality of length pitches. do. The pitch variations to be introduced are four types of pitches P1 to P4 with different circumferential lengths (P1 > P2 > P3 >
P4), each column block group is composed of blocks of four different block lengths and horizontal grooves of four different widths corresponding to these pitches. For example, taking the vertical block group 9 as a representative, the block 9a and the adjacent horizontal groove 5a correspond to the pitch P1, the block 9b and the adjacent horizontal groove 5a correspond to the pitch P2, and the block 9c corresponds to the pitch P3. and the lateral groove 5a adjacent thereto, and the block 9d and the lateral groove 5a adjacent thereto correspond to the pitch P4, respectively.
【０００７】ここで各ブロックに隣接する横溝は、その
横溝が含まれるピッチの長短に応じて深さを変化するこ
とが肝要である。すなわち短いピッチに含まれる横溝の
深さを、このピッチより長いピッチに含まれる横溝の深
さに比し浅くする。例えば図２に図１のＩＩ−ＩＩ線断
面を示すように、ピッチＰ１〜Ｐ４ に対応して、横溝
５ａの深さｄ１〜ｄ４をｄ１＞ｄ２＞ｄ３＞ｄ４とする
。具体的には、最長のピッチに対する比ｒが０．９０＜
ｒ≦０．９９のピッチに属する横溝の深さは最長のピッ
チに属する横溝の深さＤ０の０．９７５ 〜０．９８８
倍の範囲とし、同様に該比ｒが０．８０＜ｒ≦０．８
９のピッチに属する横溝の深さは上記深さＤ０の０．９
００ 〜０．９７４ 倍の範囲とし、同様に該比ｒが０
．５０＜ｒ≦０．７９のピッチに属する横溝の深さは上
記深さＤ０の０．７５０〜０．８９９ 倍の範囲とする
ことが好ましい。[0007] Here, it is important that the depth of the lateral grooves adjacent to each block changes depending on the length of the pitch in which the lateral grooves are included. That is, the depth of the lateral grooves included in the short pitch is made shallower than the depth of the lateral grooves included in the pitch longer than this pitch. For example, as shown in FIG. 2 as a cross section taken along line II--II in FIG. 1, the depths d1 to d4 of the lateral grooves 5a are set to be d1>d2>d3>d4, corresponding to the pitches P1 to P4. Specifically, the ratio r to the longest pitch is 0.90<
The depth of the lateral groove belonging to the pitch of r≦0.99 is 0.975 to 0.988 of the depth D0 of the lateral groove belonging to the longest pitch.
Similarly, the ratio r is 0.80<r≦0.8
The depth of the lateral groove belonging to pitch 9 is 0.9 of the above depth D0.
00 to 0.974 times, and similarly the ratio r is 0.
．． The depth of the lateral grooves belonging to the pitch of 50<r≦0.79 is preferably in the range of 0.750 to 0.899 times the depth D0.
【０００８】なおこの発明に従うタイヤの他の構造は、
従来タイヤの慣習に則ったものでよい。すなわちカーカ
スは、その両端部をビードコアのまわりをタイヤの内側
から外側へ巻返した少なくとも１枚（多くて３枚）のプ
ライになり、プライはレーヨン、ナイロンおよびポリエ
ステルで代表される繊維コードをタイヤの赤道面と実質
的に直交する方向（ラジアル方向）に配列したものを用
い、ベルト層は、スチールコード、芳香族ポリアミド繊
維コードなどの非伸長性コードをタイヤの赤道面に対し
て１０〜３５°の角度で配列したベルトの少なくとも２
層を互いに交差させて配置した主ベルト層の全幅にわた
り、ナイロンコードで代表される熱収縮性コードをタイ
ヤの赤道面と実質上平行に配した少なくとも１枚の補助
ベルト層を、その形成に当っては主ベルト層の円周に沿
ってコードを複数本並べたリボン状態によりらせん巻き
してなるものをそれぞれ用いる。そしてこのベルト層上
に、上記したトレッドを配置する。[0008] Other structures of the tire according to the present invention include:
It may be in accordance with conventional tire practices. In other words, the carcass consists of at least one (or at most three) plies whose ends are wrapped around a bead core from the inside of the tire to the outside of the tire. The belt layer consists of non-extensible cords such as steel cords and aromatic polyamide fiber cords arranged in a direction (radial direction) substantially perpendicular to the equatorial plane of the tire. At least two of the belts arranged at an angle of
During its formation, at least one auxiliary belt layer having heat-shrinkable cords, typically nylon cords, arranged substantially parallel to the equatorial plane of the tire is provided over the entire width of the main belt layer, the layers of which are arranged crisscrossing each other. In this case, a ribbon formed by arranging a plurality of cords along the circumference of the main belt layer and spirally wound is used. Then, the above-described tread is placed on this belt layer.
【０００９】[0009]
【作用】ピッチバリエーションを導入したブロックパタ
ーンにおいては横溝の幅もピッチに応じて増減され、つ
まり長いピッチに属する横溝の幅は短いピッチに属する
横溝の幅よりも大きいが、横溝の深さは全て一定である
のが通例である。すなわち図３に従来のタイヤのトレッ
ドの周方向断面を示すように、ピッチＰ１ に属する幅
ｗ１ の横溝とピッチＰ２ に属する幅ｗ２ （ｗ１
＞ｗ２ ）の横溝との深さｄ１ 及びｄ２ は同一であ
るが、トレッドゴム質によって（流れ易さの違い）各横
溝下のスキッドベースゲージ（横溝の溝底とベルト層と
の間隔）ａ１ 及びａ２ は同じにならずに、ａ１ ＞
ａ２ となり易いことが新たに判明した。これは流動性
が比較的悪いゴムの場合加硫成形時に横溝成形用のモー
ルドの突起がトレッドゴム内に侵入する際の抵抗が広幅
ｗ１ の横溝で特に大きいため、溝底下のゴムとベルト
層との境界がベルト層側に突出し、よって幅ｗ１ の横
溝でのスキッドベースゲージが設計厚み（≒ａ２ ）よ
り厚くなるためである。[Operation] In a block pattern that introduces pitch variations, the width of the lateral grooves is also increased or decreased according to the pitch. In other words, the width of the lateral grooves belonging to long pitches is larger than the width of lateral grooves belonging to short pitches, but the depth of the lateral grooves is It is usually constant. In other words, as shown in FIG. 3, which shows a circumferential cross-section of the tread of a conventional tire, a lateral groove with a width w1 belonging to a pitch P1 and a width w2 (w1
> w2 ) depths d1 and d2 with the lateral grooves are the same, but depending on the tread rubber quality (difference in ease of flow) the skid base gauge under each lateral groove (distance between the bottom of the lateral groove and the belt layer) a1 and a2 are not the same and a1 >
It has been newly discovered that a2 is likely to occur. This is because in the case of rubber with relatively poor fluidity, the resistance when the protrusions of the mold for forming the lateral grooves penetrate into the tread rubber during vulcanization molding is particularly large in the lateral grooves with a wide width w1, so the rubber under the groove bottom and the belt layer This is because the boundary protrudes toward the belt layer side, and therefore the skid base gauge at the lateral groove of width w1 becomes thicker than the design thickness (≈a2).
【００１０】次いで上記のように加硫成形を終了したタ
イヤに規定内圧の空気を充てんすると、内圧によってベ
ルト層は緊張し幅ｗ１ の横溝下の突出は復元される。
するとスキッドベースゲージａ１ の設計厚みに対する
増分（≒ａ１ −ａ２ ）は、ブロック表面の特に縁部
に部分的な突出となって現れる。この部分的な突出は、
各ブロックにおいて偏摩耗の核となることは勿論、タイ
ヤ転動中に生じるブロックと路面との衝突音の不均一化
をまねき、タイヤ騒音を増大することになる。この現象
は、ブロック剛性の高い、長いピッチに属するブロック
において顕著である。Next, when the tire that has been vulcanized and molded as described above is filled with air at a specified internal pressure, the belt layer is tensed by the internal pressure, and the protrusion under the lateral groove having the width w1 is restored. Then, the increment (≈a1 − a2 ) of the skid base gauge a1 relative to the design thickness appears as a partial protrusion on the block surface, especially at the edge. This partial protrusion is
Not only does this become the core of uneven wear in each block, but it also causes non-uniformity of the collision noise between the blocks and the road surface that occurs during tire rolling, increasing tire noise. This phenomenon is remarkable in blocks that have high block rigidity and belong to long pitches.
【００１１】そこで横溝の幅、すなわちピッチ長さに対
応して横溝の深さを調節することによって、加硫成形後
のスキッドベースゲージを横溝の幅にかかわらず、ほぼ
一定にし、タイヤに規定内圧の空気を充てんした状態に
あってもブロックの表面を平坦化し、偏摩耗やタイヤ騒
音の増大を回避する。[0011] Therefore, by adjusting the depth of the lateral grooves in accordance with the width of the lateral grooves, that is, the pitch length, the skid base gauge after vulcanization molding can be made almost constant regardless of the width of the lateral grooves, and the specified internal pressure can be maintained in the tire. Even when the block is filled with air, the surface of the block is flattened to avoid uneven wear and increase in tire noise.
【００１２】0012
【実施例】第１図に示したトレッドパターンに準じて、
タイヤサイズ１９５／６０Ｒ１５の空気入りラジアルタ
イヤを試作した。導入したピッチバリーションはピッチ
Ｐ１：３０ｍｍ、ピッチＰ２： ２７ｍｍ 、ピッチＰ
３：２５．５ｍｍ及びピッチＰ４：１８ｍｍ、すなわち
ピッチ比Ｐ１：Ｐ２：Ｐ３：Ｐ４ は１０：９：８．５
：６である。また横溝４ａ，４ｂ，５ａ，５ｂ の幅
は、ピッチＰ１ に属する溝で５ｍｍ、ピッチＰ２ に
属する溝で４．５ｍｍ 、ピッチＰ３ に属する溝で４
．３ｍｍ 、ピッチＰ４ に属する溝で３．０ｍｍ と
し、さらにその深さは、ピッチＰ１ に属する溝で７．
０ ｍｍ、ピッチＰ２ に属する溝で６．８５ｍｍ、ピ
ッチＰ３ に属する溝で６．７ ｍｍ、ピッチＰ４ に
属する溝で６．０ ｍｍとした。なお中央周溝１の幅は
４ｍｍ、周溝２ａ，２ｂ，３ａ，３ｂ の幅は１０ｍｍ
及び深さは全て８．５ ｍｍとした。また比較として、
横溝の深さを全て７．０ ｍｍとした他は上記と同様の
構成のタイヤについても試作した。[Example] According to the tread pattern shown in Fig. 1,
A pneumatic radial tire with a tire size of 195/60R15 was manufactured as a prototype. The introduced pitch variations are pitch P1: 30mm, pitch P2: 27mm, pitch P
3:25.5mm and pitch P4: 18mm, that is, pitch ratio P1:P2:P3:P4 is 10:9:8.5
:6. The widths of the lateral grooves 4a, 4b, 5a, and 5b are 5 mm for grooves belonging to pitch P1, 4.5 mm for grooves belonging to pitch P2, and 4 mm for grooves belonging to pitch P3.
．． 3mm, and the depth of the groove belonging to pitch P4 is 3.0mm, and the depth is 7.0mm for the groove belonging to pitch P1.
0 mm, 6.85 mm for grooves belonging to pitch P2, 6.7 mm for grooves belonging to pitch P3, and 6.0 mm for grooves belonging to pitch P4. The width of the central circumferential groove 1 is 4 mm, and the width of the circumferential grooves 2a, 2b, 3a, and 3b is 10 mm.
and depth were all 8.5 mm. Also, for comparison,
A trial tire with the same configuration as above was also manufactured, except that the depth of all lateral grooves was 7.0 mm.
【００１３】上記の各タイヤを、５ １／２Ｊ×１５サ
イズのリムに装着後に内圧２．２ｋｇｆ／ｍｍ２で空気
を充てんし４４０ｋｇ の荷重をドラム上で加えた状態
で、無響室内でタイヤサイドウォール側面より１ｍ離れ
た位置で、踏面より１ｍの高さにマイクロフォンを設置
し、時速１００ｋｍ／ｈ 〜２０ｋｍ／ｈの惰行走音の
試験を行ったところ、この発明に従うタイヤから生じる
音圧は比較タイヤよりも２．３ｄＢＡも低い値を示した
。また上記と同様にリム組み後空気を充てんしたタイヤ
を乗用車に装着し、平均速度８０ｋｍ／ｈで１００００
ｋｍ を走行した後、トレッド表面の摩耗によるブロッ
ク間段差を調べたところ、比較タイヤが０．５ｍｍ で
あったのに対し、この発明に従うタイヤは０．１ｍｍ
であった。After each of the above tires was mounted on a 5 1/2 J x 15 size rim, the tires were filled with air at an internal pressure of 2.2 kgf/mm2 and a load of 440 kg was applied on the drum, and the tire side was placed in an anechoic chamber. A microphone was installed 1m away from the side of the wall and 1m above the tread surface, and a coasting sound test at speeds of 100km/h to 20km/h was conducted.The sound pressure generated by the tire according to the present invention was compared. It showed a value 2.3 dBA lower than that of tires. Also, in the same way as above, after assembling the rim, the tire filled with air was installed on a passenger car, and the tire was driven at an average speed of 80 km/h for 10,000 km/h.
After driving for 2 km, the difference in level between blocks due to wear on the tread surface was examined and found that the comparison tire was 0.5 mm, while the tire according to the present invention was 0.1 mm.
Met.
【００１４】[0014]
【発明の効果】この発明によれば、ピッチバリエーショ
ンを導入したブロックパターンの各ブロック間における
面圧を均一化することができ、騒音特性に優れかつ耐偏
摩耗性の高い空気入りタイヤを提供し得る。[Effects of the Invention] According to the present invention, it is possible to equalize the surface pressure between each block of a block pattern that introduces pitch variations, and to provide a pneumatic tire that has excellent noise characteristics and high uneven wear resistance. obtain.
【図１】この発明に従う空気入りタイヤのトレッド要部
の展開図である。FIG. 1 is a developed view of a main part of a tread of a pneumatic tire according to the present invention.
【図２】図１のＩＩ−ＩＩ線に沿う断面図である。FIG. 2 is a sectional view taken along line II-II in FIG. 1;
【図３】従来のタイヤのトレッド要部の断面図である。FIG. 3 is a sectional view of a main part of a tread of a conventional tire.
１ 中央周溝 ２ａ 周溝 ２ｂ 周溝 ３ａ 周溝 ３ｂ 周溝 ４ａ 横溝 ４ｂ 横溝 ５ａ 横溝 ５ｂ 横溝 ６ａ リブ ６ｂ リブ ７ 縦列ブロック群 ８ 縦列ブロック群 ９ 縦列ブロック群 １０ 縦列ブロック群 １１ 補助周溝 1 Center circumferential groove 2a Circumferential groove 2b Circumferential groove 3a Circumferential groove 3b Circumferential groove 4a Horizontal groove 4b Horizontal groove 5a Horizontal groove 5b Horizontal groove 6a Rib 6b Rib 7 Column block group 8 Column block group 9 Column block group 10 Column block group 11 Auxiliary circumferential groove
Claims (1)
トロイダル状に連なるトレッドに、このトレッド円周に
沿って延びる複数の周溝及びこれら周溝を横切る向きで
延びる多数の横溝にて区画される縦列ブロック群をそな
え、さらに該ブロック群の各ブロックにおいて対辺をな
す横溝の一方を含むブロックの周方向長さで定義される
ピッチにつき、複数の長さのピッチを組合わせて縦列ブ
ロック群を配列した空気入りタイヤにおいて、短いピッ
チに属する横溝の深さを、長いピッチに属する横溝の深
さより浅くしてなる騒音を低減した空気入りタイヤ。Claim 1: A tread that extends in a toroidal shape between a pair of sidewalls and is defined by a plurality of circumferential grooves extending along the circumference of the tread and a number of lateral grooves extending across these circumferential grooves. A vertical block group is provided, and the vertical block groups are arranged by combining pitches of a plurality of lengths, with a pitch defined by the circumferential length of the block including one of the horizontal grooves forming the opposite side in each block of the block group. A pneumatic tire that reduces noise by making the depth of lateral grooves belonging to short pitches shallower than the depth of lateral grooves belonging to long pitches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3029274A JPH04244402A (en) | 1991-01-31 | 1991-01-31 | Neumatic tire with reduced noise |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3029274A JPH04244402A (en) | 1991-01-31 | 1991-01-31 | Neumatic tire with reduced noise |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04244402A true JPH04244402A (en) | 1992-09-01 |
Family
ID=12271706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3029274A Pending JPH04244402A (en) | 1991-01-31 | 1991-01-31 | Neumatic tire with reduced noise |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04244402A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1016556A2 (en) * | 1998-12-28 | 2000-07-05 | Sumitomo Rubber Industries Limited | Vehicle tyre |
| JP2003002012A (en) * | 2001-06-26 | 2003-01-08 | Toyo Tire & Rubber Co Ltd | Pneumatic tire |
| JP2004210133A (en) * | 2002-12-27 | 2004-07-29 | Yokohama Rubber Co Ltd:The | Pneumatic tire, its manufacturing method, and forming mold |
| KR100493664B1 (en) * | 2002-07-09 | 2005-06-03 | 한국타이어 주식회사 | Pneumatic tire having improved noise |
| KR100498019B1 (en) * | 1999-10-08 | 2005-07-01 | 한국타이어 주식회사 | Pneumatic tire |
| JP2008296858A (en) * | 2007-06-04 | 2008-12-11 | Yokohama Rubber Co Ltd:The | Pneumatic tire |
| EP2871070A1 (en) * | 2013-11-12 | 2015-05-13 | Hankook Tire Co., Ltd. | Pneumatic tire |
-
1991
- 1991-01-31 JP JP3029274A patent/JPH04244402A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1016556A2 (en) * | 1998-12-28 | 2000-07-05 | Sumitomo Rubber Industries Limited | Vehicle tyre |
| EP1016556A3 (en) * | 1998-12-28 | 2000-12-13 | Sumitomo Rubber Industries Limited | Vehicle tyre |
| US7625456B2 (en) | 1998-12-28 | 2009-12-01 | Sumitomo Rubber Industries, Ltd. | Method of designing tread pattern having three-dimensional design units |
| KR100498019B1 (en) * | 1999-10-08 | 2005-07-01 | 한국타이어 주식회사 | Pneumatic tire |
| JP2003002012A (en) * | 2001-06-26 | 2003-01-08 | Toyo Tire & Rubber Co Ltd | Pneumatic tire |
| JP4652622B2 (en) * | 2001-06-26 | 2011-03-16 | 東洋ゴム工業株式会社 | Pneumatic tire |
| KR100493664B1 (en) * | 2002-07-09 | 2005-06-03 | 한국타이어 주식회사 | Pneumatic tire having improved noise |
| JP2004210133A (en) * | 2002-12-27 | 2004-07-29 | Yokohama Rubber Co Ltd:The | Pneumatic tire, its manufacturing method, and forming mold |
| JP2008296858A (en) * | 2007-06-04 | 2008-12-11 | Yokohama Rubber Co Ltd:The | Pneumatic tire |
| EP2871070A1 (en) * | 2013-11-12 | 2015-05-13 | Hankook Tire Co., Ltd. | Pneumatic tire |
| JP2015093669A (en) * | 2013-11-12 | 2015-05-18 | ハンコック タイヤ カンパニー リミテッド | Pneumatic tire |
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