JPH11286204A - Pneumatic tire - Google Patents
Pneumatic tireInfo
- Publication number
- JPH11286204A JPH11286204A JP10088354A JP8835498A JPH11286204A JP H11286204 A JPH11286204 A JP H11286204A JP 10088354 A JP10088354 A JP 10088354A JP 8835498 A JP8835498 A JP 8835498A JP H11286204 A JPH11286204 A JP H11286204A
- Authority
- JP
- Japan
- Prior art keywords
- side wall
- block land
- land portion
- pneumatic tire
- tread
- 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- Withdrawn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
- B60C11/03—Tread patterns
- B60C11/13—Tread patterns characterised by the groove cross-section, e.g. for buttressing or preventing stone-trapping
- B60C11/1376—Three dimensional block surfaces departing from the enveloping tread contour
- B60C11/1384—Three dimensional block surfaces departing from the enveloping tread contour with chamfered block corners
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】この発明は、トレッド部に多
数個のブロック陸部を区分形成してなる空気入りタイヤ
に関するものであり、より具体的には、従来のブロック
陸部を有するタイヤでは両立が難しいとされていた操縦
安定性の向上と偏摩耗の抑制の双方を満足させることに
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic tire in which a plurality of block land portions are separately formed on a tread portion. More specifically, the present invention relates to a conventional pneumatic tire having block land portions. It is intended to satisfy both the improvement of steering stability and the suppression of uneven wear, which have been considered difficult.
【０００２】[0002]
【従来の技術】トレッド部に多数個のブロック陸部を区
分形成した、いわゆるブロックパターンを有する空気入
りタイヤの場合、かかるパターンを有することに伴って
顕著に生じがちである偏摩耗を改善するとともに、操縦
安定性をより一層向上させることは重要なことである。2. Description of the Related Art In the case of a pneumatic tire having a so-called block pattern in which a large number of block land portions are separately formed in a tread portion, uneven wear, which tends to occur remarkably due to having such a pattern, is improved. It is important to further improve the steering stability.
【０００３】これらの性能を改善する手段としては、ブ
ロック陸部の側壁形状の適正化を図ることが有用であ
り、これまでにも種々の側壁形状が提案されてきた。As a means for improving these performances, it is useful to optimize the side wall shape of the block land portion, and various side wall shapes have been proposed so far.
【０００４】例えば、ブロック陸部での偏摩耗を抑制す
るには、ブロック陸部の後続接地側（いわゆる蹴りだし
側）の側壁の踏面とのなす交角θを極力小さくして（具
体的には前記交角θを90°に近づける。）、ブロック陸
部の後続接地側部分の接地圧を下げて摩耗仕事量を減少
させることが効果的である。[0004] For example, in order to suppress uneven wear on the block land portion, the intersection angle θ between the tread surface of the side wall on the succeeding ground contact side (so-called kick side) of the block land portion is made as small as possible (specifically, The intersection angle θ approaches 90 °), and it is effective to reduce the contact pressure of the subsequent contact portion on the block land portion to reduce the work of wear.
【０００５】また、タイヤの操縦安定性を高めるには、
ブロック陸部の側壁、特に浮き上がりがちな後続接地側
の側壁の踏面とのなす交角θを極力大きくして、ブロッ
ク陸部の後続接地側の端縁部の陸部剛性を高めることに
よって、ブロック陸部内の接地圧分布を均一にすること
が効果的である。In order to improve the steering stability of the tire,
By increasing the intersection angle θ between the tread surface of the side wall of the block land part, particularly the side wall of the subsequent ground contact side that tends to rise, as much as possible, and increasing the land rigidity of the edge part of the block land part on the subsequent ground contact side, the block land It is effective to make the ground pressure distribution in the unit uniform.
【０００６】[0006]
【発明が解決しようとする課題】ところで、従来提案さ
れてきたブロック陸部の側壁形状は、一側壁で見ると、
平面的な形状であること、具体的には、前記交角θを側
壁端部から側壁中央部にわたって同一角度に設定する場
合がほとんどであった。By the way, the shape of the side wall of the block land portion which has been proposed in the past, when viewed from one side wall, is as follows.
In most cases, the intersection angle θ is set to the same angle from the end of the side wall to the center of the side wall.
【０００７】このため、偏摩耗の抑制を目的として前記
交角θを小さくすると、操縦安定性が悪化することにな
り、また、操縦安定性を高めることを目的として前記交
角θを大きくすると、偏摩耗が生じやすくなり、よっ
て、操縦安定性と偏摩耗の両性能を満足させることは、
平面的形状の側壁で形成される従来のブロック陸部を有
するタイヤでは困難であった。For this reason, if the intersection angle θ is reduced for the purpose of suppressing uneven wear, the steering stability is degraded. On the other hand, if the intersection angle θ is increased for the purpose of enhancing steering stability, the uneven wear is reduced. Therefore, satisfying both the steering stability and uneven wear performance is
It has been difficult with a tire having a conventional block land portion formed by a side wall having a planar shape.
【０００８】そこで、発明者は、偏摩耗を抑制しつつ操
縦安定性を高めるべく、１個のブロック陸部の面内剛性
について検討した。Therefore, the inventor has studied the in-plane rigidity of one block land portion in order to increase steering stability while suppressing uneven wear.
【０００９】その結果、ブロック陸部の面内剛性は、内
陸部で高く、端縁部で低く、特に一端縁部での剛性に着
目した場合、側壁中央部で高く、側壁端部で低く、一端
縁部での陸部剛性の差が大きいことを見出した。従っ
て、側壁を単に平面的に形成しただけの従来手段では、
ブロック陸部の一端縁部での剛性差をなくすことが困難
であることが判明した。As a result, the in-plane stiffness of the block land portion is high at the inland portion and low at the edge portion. In particular, when attention is paid to the stiffness at one edge portion, it is high at the center portion of the side wall and low at the end portion of the side wall. It was found that the difference in land rigidity at one edge was large. Therefore, in the conventional means in which the side wall is simply formed in a plane,
It turned out that it was difficult to eliminate the difference in rigidity at one edge of the block land.
【００１０】この発明の目的は、ブロック陸部の側壁の
うち、少なくとも一の側壁を、その端部と中央部とでそ
れぞれ適正形状にすることによって、偏摩耗を抑制でき
かつ操縦安定性に優れた空気入りタイヤを提供すること
にある。An object of the present invention is to form at least one of the side walls of a block land portion into an appropriate shape at each of its end and center portions, whereby uneven wear can be suppressed and steering stability is excellent. To provide a pneumatic tire.
【００１１】[0011]
【課題を解決するための手段】上記目的を達成するた
め、この発明の空気入りタイヤは、トレッド部に、多数
個のブロック陸部を区分形成してなる空気入りタイヤに
おいて、ブロック陸部の踏面輪郭形状は、直線又は曲線
を１辺とする４辺以上で構成される多辺形状であり、ブ
ロック陸部の側壁のうち、少なくとも前記１辺に対応す
る所定の側壁は、その踏面とのなす交角が、側壁端部で
側壁中央部に比べて大きい。In order to achieve the above object, a pneumatic tire according to the present invention is a pneumatic tire in which a plurality of block land portions are separately formed on a tread portion. The contour shape is a multi-sided shape composed of four or more sides with a straight line or a curve as one side, and among the side walls of the block land portion, at least a predetermined side wall corresponding to the one side forms a tread surface. The intersection angle is larger at the end of the side wall than at the center of the side wall.
【００１２】尚、ここでいう「多辺形状」には、具体的
には、長方形や平行四辺形のように線分を結合した形状
の他、直線と曲線との結合や、曲率の異なる曲線同士の
結合によって形成される形状も含めることとする。ま
た、「側壁中央部」は、側壁を３等分したときの真ん中
の側壁部分をいうこととし、「側壁端部」は、側壁中央
部の両側に位置する側壁部分をいうこととする。Incidentally, the term “polygonal shape” used herein specifically refers to a shape obtained by connecting line segments such as a rectangle or a parallelogram, a connection between a straight line and a curve, or a curve having a different curvature. The shape formed by the connection between them is also included. In addition, the “central part of the side wall” refers to a middle side wall part when the side wall is divided into three equal parts, and the “end parts of the side wall” refers to side wall parts located on both sides of the central part of the side wall.
【００１３】さらに、前記所定側壁は、前記交角が側壁
中央部から側壁端部に向かうにつれて漸増する形状を有
することが好ましく、前記交角は、側壁中央部で90〜10
5 °の範囲、側壁端部で95〜120 °の範囲であることが
より好ましい。Further, it is preferable that the predetermined side wall has a shape in which the angle of intersection gradually increases from the center of the side wall toward the end of the side wall.
More preferably, it is in the range of 5 ° and 95-120 ° at the side wall end.
【００１４】加えて、駆動性能又は制動性能のいずれか
一方のみを特に高める必要がある場合には、ブロック陸
部の側壁のうち、前記１辺に対応する側壁を前記所定側
壁とすることが好ましく、また、駆動性能と制動性能の
双方を特に高める必要がある場合には、ブロック陸部の
側壁のうち、向かい合う前記２辺に対応する側壁を前記
所定側壁とすることが好ましく、駆動性能と制動性能に
加えて、コーナリング性能、初期操舵性能を高める必要
がある場合には、ブロック陸部の全側壁を前記所定側壁
とすることが好ましい。In addition, when it is necessary to particularly enhance only one of the driving performance and the braking performance, it is preferable that the side wall corresponding to the one side among the side walls of the block land portion is the predetermined side wall. When it is necessary to particularly enhance both the driving performance and the braking performance, it is preferable that, of the side walls of the block land portion, the side wall corresponding to the two opposite sides is the predetermined side wall. When it is necessary to improve the cornering performance and the initial steering performance in addition to the performance, it is preferable that all the side walls of the block land portion be the predetermined side walls.
【００１５】[0015]
【発明の実施の形態】次に、この発明の実施の形態を図
面を参照しながら以下で説明する。図１は、この発明に
従う空気入りタイヤの代表的なトレッドパターンの一部
を示したものであり、図中１はトレッド部、２ａ〜２ｄ
は周方向溝、３は横断溝、４ａ〜４ｅはブロック陸部、
５はタイヤ周方向、６はタイヤ幅方向、７はブロック陸
部の踏面輪郭、８ａ〜８ｄはブロック陸部の側壁、９は
側壁端部、１０は側壁中央部、１１はブロック陸部の踏
面である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a part of a typical tread pattern of a pneumatic tire according to the present invention, where 1 is a tread portion, 2a to 2d.
Is a circumferential groove, 3 is a transverse groove, 4a to 4e are block land portions,
5 is a tire circumferential direction, 6 is a tire width direction, 7 is a tread contour of a block land portion, 8a to 8d are side walls of a block land portion, 9 is a side wall end portion, 10 is a side wall center portion, and 11 is a tread surface of a block land portion. It is.
【００１６】図１に示すトレッドパターンを有するタイ
ヤは、トレッド部１に、タイヤ周方向５と平行に延びる
複数本の周方向溝２ａ〜２ｄと、これらの周方向溝２ａ
〜２ｄを所定の間隔をおいて横切って延びる多数本の横
断溝３とを配設することによって、多数個のブロック陸
部４ａ〜４ｅを区分形成したものである。In the tire having the tread pattern shown in FIG. 1, a plurality of circumferential grooves 2a to 2d extending in parallel with the tire circumferential direction 5 and a plurality of circumferential grooves 2a
２2d are provided with a plurality of transverse grooves 3 extending at predetermined intervals to form a plurality of block land portions 4a４4e.
【００１７】周方向溝２ａ〜２ｄは、図１ではストレー
ト状溝である場合を示したが、ジグザグ状溝でもよく、
また、横断溝３は、タイヤ幅方向６に対して幾分傾斜さ
せて配設した場合を示したが、この傾斜の角度は変化さ
せることができ（尚、前記傾斜角度が０°も含む。）、
これらの溝２ａ〜２ｄ及び３は種々の態様を採ることが
できる。Although the circumferential grooves 2a to 2d are shown as straight grooves in FIG. 1, they may be zigzag grooves.
Further, the case where the transverse groove 3 is arranged to be slightly inclined with respect to the tire width direction 6 is shown, but the angle of this inclination can be changed (the angle of inclination also includes 0 °). ),
These grooves 2a to 2d and 3 can take various forms.
【００１８】そして、この発明の主な特徴は、ブロック
陸部４の側壁形状の適正化にあり、具体的には、ブロッ
ク陸部４の踏面輪郭７の形状は、直線又は曲線を１辺と
する４辺以上で構成される多辺形状であり、ブロック陸
部４の側壁８ａ〜８ｄのうち、少なくとも前記１辺に対
応する所定の側壁８ａ（図１では所定側壁は１側壁のみ
である。）は、その踏面11とのなす交角θを側壁端部９
( θ= θ1 ）で側壁中央部10( θ= θ2 ）に比べて大き
くすること（θ1 ＞θ2 ）にある（図２（ａ）参照）。The main feature of the present invention lies in the optimization of the side wall shape of the block land portion 4. Specifically, the shape of the tread surface profile 7 of the block land portion 4 is such that a straight line or a curve is defined as one side. A predetermined side wall 8a corresponding to at least one of the side walls 8a to 8d of the block land portion 4 (the predetermined side wall is only one side wall in FIG. 1). ) Is the angle of intersection θ between the tread 11 and the side wall end 9.
(θ = θ 1 ) is to be larger (θ 1 > θ 2 ) than the central portion 10 of the side wall (θ = θ 2 ) (see FIG. 2A).
【００１９】即ち、ブロック陸部４の所定側壁８ａにお
いて、側壁端部９での前記交角θ1を側壁中央部10での
前記交角θ2 よりも大きくすることによって、図５に示
すような従来タイヤのブロック陸部１０１のように、そ
の側壁１０４ａ〜１０４ｄが平面形状で形成された場合
と比べて、ブロック陸部４の側壁端部９側の端縁部での
陸部剛性が大きく、側壁中央部10側の端縁部での陸部剛
性が小さくなり、その結果、ブロック陸部４の所定側壁
８ａ側の端縁部での陸部剛性の差がなくなるため、ブロ
ック陸部内の接地圧分布を均一にすることができる。That is, by making the intersection angle θ 1 at the side wall end 9 larger than the intersection angle θ 2 at the side wall center portion 10 at the predetermined side wall 8 a of the block land portion 4, as shown in FIG. As compared with the case where the side walls 104a to 104d are formed in a planar shape like the block land part 101 of the tire, the land part rigidity at the edge on the side wall end part 9 side of the block land part 4 is large, The land rigidity at the edge on the central portion 10 side is reduced, and as a result, there is no difference in land rigidity at the edge on the predetermined side wall 8a side of the block land portion 4, so that the ground pressure inside the block land portion is reduced. The distribution can be made uniform.
【００２０】図２(a) は図１に示すブロック陸部４ａ〜
４ｅのうちの１個のブロック陸部４ｃのみを抜き出した
ものを斜め上方から眺めたものである。図１及び図２
(a) では、ブロック陸部４ｃの踏面輪郭７は、１本の曲
線７ａと３本の直線７ｂ〜７ｄとの計４辺からなる四辺
形状をなしており、ブロック陸部４ｃの４つの側壁８ａ
〜８ｄのうち、１つの辺７ａに対応する側壁８ａだけに
ついて、側壁端部９での前記交角θ1 を側壁中央部10で
の前記交角θ2 に比べて大きくしてある。FIG. 2A shows the block land portions 4a to 4a shown in FIG.
4e is a view of only one block land portion 4c extracted from obliquely above. 1 and 2
In (a), the tread contour 7 of the block land portion 4c has a quadrilateral shape composed of four sides of one curve 7a and three straight lines 7b to 7d, and four side walls of the block land portion 4c. 8a
Of ～8D, the only side walls 8a corresponding to one of the sides 7a, is made larger than the crossing angle theta 1 at the side wall end portion 9 to the crossing angle theta 2 in the sidewall central portion 10.
【００２１】そして、上記ブロック陸部４ｃを、その前
記所定側壁８ａが、例えば後続接地側に位置するような
向きに配設すれば、操縦安定性、特に駆動性能が高まる
とともに、ブロック陸部の後続接地側の角部での偏摩耗
を抑制することができ、反対に、前記所定側壁８ａが先
行接地側に位置するような向きに配設すれば、操縦安定
性、特に制動性能が高まるとともに、ブロック陸部の先
行接地側の角部での偏摩耗を抑制することができる。If the block land portion 4c is arranged in such a direction that the predetermined side wall 8a is located, for example, on the subsequent ground contact side, the steering stability, especially the driving performance is enhanced, and the block land portion 4c is formed. Uneven wear at the corner on the trailing contact side can be suppressed. Conversely, if the predetermined side wall 8a is disposed in such a direction as to be located on the leading contact side, the steering stability, particularly the braking performance, is improved. In addition, uneven wear at the corner of the block land portion on the preceding ground contact side can be suppressed.
【００２２】また、前記所定側壁８ａを、前記交角θを
側壁中央部10から側壁端部９に向かうにつれて漸増する
ような曲面形状にすれば、ブロック陸部の前記所定側壁
８ａを設けた側の端縁部での接地圧をより一層均一にす
ることができる。Further, if the predetermined side wall 8a is formed into a curved shape such that the intersection angle θ gradually increases from the side wall center portion 10 to the side wall end portion 9, the side of the block land portion where the predetermined side wall 8a is provided. The contact pressure at the edge can be made more uniform.
【００２３】前記所定側壁の前記交角θは、具体的に
は、側壁中央部で90〜105 °の範囲、側壁端部で95〜12
0 °の範囲にすることが好ましい。Specifically, the intersection angle θ of the predetermined side wall is in the range of 90 to 105 ° at the center of the side wall and 95 to 12 ° at the end of the side wall.
It is preferable that the angle be in the range of 0 °.
【００２４】尚、図１では、特に操縦安定性の向上と偏
摩耗の抑制の双方を満足させるため、ブロック陸部の側
壁８ａ〜８ｄのうち、１つの側壁８ａだけを前記所定側
壁としたが、他の側壁８ｂ〜８ｄについても前記所定側
壁とすることができる。In FIG. 1, only one side wall 8a among the side walls 8a to 8d of the block land portion is used as the predetermined side wall in order to satisfy both improvement of the steering stability and suppression of uneven wear. The other side walls 8b to 8d can also be the predetermined side walls.
【００２５】例えば、図４（ａ），（ｂ）に示すよう
に、ブロック陸部４の側壁８ａ〜８ｄのうち、向かい合
う前記２辺に対応する側壁８ａ及び８ｃを前記所定側壁
とすること、具体的には、前記側壁８ａ及び８ｃを、そ
れぞれ、ブロック陸部の、後続接地側と先行接地側とに
位置するような向きにブロック陸部を配設すれば、操縦
安定性と偏摩耗の双方をより一層改善することができ、
また、図３（ａ）〜（ｃ）に示すように、ブロック陸部
の全側壁８ａ〜８ｄを前記所定側壁とすれば、さらに上
記性能に加えてコーナリング性等についての向上も期待
できる。For example, as shown in FIGS. 4A and 4B, of the side walls 8a to 8d of the block land portion 4, the side walls 8a and 8c corresponding to the two opposite sides are set as the predetermined side walls. Specifically, if the side walls 8a and 8c are provided with the block land portions in such a direction as to be located on the subsequent ground contact side and the preceding ground contact side of the block land portion, respectively, the steering stability and uneven wear can be improved. Both can be further improved,
Further, as shown in FIGS. 3 (a) to 3 (c), when all the side walls 8a to 8d of the block land portions are the predetermined side walls, further improvement in cornering properties and the like can be expected in addition to the above-mentioned performance.
【００２６】また、図２（ａ）では、側壁８ａの形状
が、その溝壁上辺１２と溝壁底辺１３とを踏面１１に平
行な平面上に投影して眺めたとき、溝壁上辺１２が凸曲
線状、溝壁底辺１３が直線状である場合を示したが、そ
の他の実施形態として、図２（ｂ）に示すように、溝壁
上辺１２が直線状、溝壁底辺１３が凹曲線状であっても
よく、種々の形状を採ることができる。In FIG. 2A, when the shape of the side wall 8a is viewed by projecting the groove wall upper side 12 and the groove wall bottom 13 onto a plane parallel to the tread surface 11, the groove wall upper side 12 Although the case where the convex curve shape and the groove wall bottom 13 are linear is shown, as another embodiment, as shown in FIG. 2B, the groove wall upper side 12 is linear and the groove wall bottom 13 is concave curve. And may take various shapes.
【００２７】尚、上述したところは、この発明の実施形
態の一例を示したにすぎず、請求の範囲において種々の
変更を加えることができる。例えば、図 1では、前記所
定側壁８ａを、ブロック陸部４ａ〜４ｅのうち、３種類
のブロック陸部４ｂ〜４ｄに設けた場合を示してある
が、この構成だけには限定されず、全てのブロック陸部
４ａ〜４ｅに設けてもよく、或いは、同一ブロック陸部
列内において、１つおきに設けることもでき、前記所定
側壁は必要に応じて適宜配設することができる。The above is only an example of the embodiment of the present invention, and various changes can be made within the scope of the claims. For example, FIG. 1 shows a case where the predetermined side wall 8a is provided in three types of block land portions 4b to 4d among the block land portions 4a to 4e, but the present invention is not limited to this configuration, and all May be provided on the block land portions 4a to 4e, or may be provided every other block in the same block land portion row, and the predetermined side wall may be appropriately disposed as necessary.
【００２８】[0028]
【実施例】次に、この発明に従う空気入りタイヤを試作
し、性能を評価したので以下で説明する。実施例１〜４
のタイヤは、タイヤサイズが１９５／６５Ｒ１５である
乗用車用タイヤであり、図１に示すようなトレッドパタ
ーンを基調とし（但し、ブロック陸部４ａ〜４ｅの踏面
形状はいずれも平行四辺形ではなく長方形とする。）、
ブロック陸部４ａ〜４ｅの4 つの側壁8a〜8dを、各側壁
の両端部９での前記交角θ（＝θ1 ）と中央部10での前
記交角θ（＝θ2 ）が表１に示す値になるように形成し
た。Next, a pneumatic tire according to the present invention was prototyped and its performance was evaluated. Examples 1-4
Are tires for passenger cars having a tire size of 195 / 65R15, and are based on a tread pattern as shown in FIG. 1 (however, the tread shapes of the block land portions 4a to 4e are not parallelograms but rectangular. ),
The four side walls 8a to 8d of the block land portions 4a to 4e are shown in Table 1 with the intersection angle θ (= θ 1 ) at both end portions 9 of each side wall and the intersection angle θ (= θ 2 ) at the central portion 10. It was formed to have a value.
【００２９】尚、表１に示す前記交角θ1 及びθ2 は、
ブロック陸部４ａ〜４ｅのうちの、３種類のブロック陸
部４ｂ〜４ｄの角度であり、他のブロック陸部４ａ，４
ｅについては４つの側壁８ａ〜８ｄとも、前記交角θ1
及びθ2 が同一である平面形状の側壁とし、２つの側壁
８ａ及び８ｃはいずれも９５°（一定）、残りの側壁８
ｂ及び８ｄはいずれも１００°（一定）とした。また、
上記３種類のブロック陸部４ｂ〜４ｄについては、全て
ブロック体積を同じにした。The intersection angles θ 1 and θ 2 shown in Table 1 are:
The angles of the three types of block land portions 4b to 4d among the block land portions 4a to 4e, and the angles of the other block land portions 4a and 4d.
As for e, the intersection angle θ 1 is determined for all of the four side walls 8a to 8d.
And θ 2 are the same, and the two side walls 8 a and 8 c are both 95 ° (constant) and the remaining side walls 8
Each of b and 8d was set to 100 ° (constant). Also,
The three types of block land portions 4b to 4d have the same block volume.
【００３０】参考のため、全てのブロック陸部の4 つの
側壁とも、側壁端部９での前記交角θ1 と中央部10での
前記交角θ2 とが同一である平面形状の側壁とした従来
タイヤ（従来例）についても試作したので表１に併せて
示す。尚、この発明はトレッド部を形成するブロック陸
部の側壁形状に特徴があるため、その他のタイヤ構造に
ついては、一般的な乗用車用タイヤとほぼ同様な構造と
した。For reference, all four side walls of the land portion of the block have a flat side wall in which the intersection angle θ 1 at the side wall end 9 and the intersection angle θ 2 at the central part 10 are the same. A prototype tire (conventional example) is also shown in Table 1. In addition, since the present invention is characterized by the side wall shape of the block land portion forming the tread portion, the other tire structure is substantially the same as a general passenger car tire.
【００３１】（試験方法）上記各供試タイヤを標準リム
（６ＪＪ）に組み付けてタイヤ車輪( 空気圧2.0kgf/c
m2) を装着した乗用車でドライ及びウエット路面条件下
のテストコースを走行し、プロのドライバーによるフィ
ーリングによって操縦安定性を評価し、また、１万ｋｍ
走行後に、各タイヤについて、そのタイヤ幅方向位置が
ほぼ同じであるブロック陸部の偏摩耗量を測定すること
によって、偏摩耗の良否を評価した。表１にこれらの評
価結果を示す。尚、表１中の評価結果の数値は、操縦安
定性及び偏摩耗とも、従来例を１００とした指数比で示
してあり、数値はいずれも大きいほど優れている。(Test method) Each of the test tires was assembled on a standard rim (6JJ) and the tire wheels (air pressure: 2.0 kgf / c)
m 2 ) on a test car on dry and wet road surface conditions, evaluate the steering stability by feeling of a professional driver, and 10,000 km
After running, the quality of uneven wear was evaluated for each tire by measuring the uneven wear amount of the block land portion where the position in the tire width direction was substantially the same. Table 1 shows the results of these evaluations. In addition, the numerical values of the evaluation results in Table 1 are shown as index ratios with respect to the steering stability and uneven wear assuming that the conventional example is 100, and the larger the numerical values, the better.
【００３２】[0032]
【表１】 [Table 1]
【００３３】表１の結果から、実施例１〜４は、いずれ
も従来例に比べて操縦安定性に優れ、ブロック陸部での
偏摩耗が抑制されているのがわかる。From the results shown in Table 1, it can be seen that Examples 1 to 4 are all superior in steering stability to the conventional example, and that uneven wear at the block land portion is suppressed.
【００３４】[0034]
【発明の効果】この発明によって、ブロック陸部の、少
なくとも１辺に対応する側壁形状を、側壁端部と側壁中
央部とでそれぞれ適正形状にすることによって、偏摩耗
が抑制されかつ操縦安定性に優れた空気入りタイヤの提
供が可能となった。According to the present invention, the side wall shape corresponding to at least one side of the block land portion is appropriately formed at the side wall end portion and the side wall center portion, thereby suppressing uneven wear and steering stability. It has become possible to provide excellent pneumatic tires.
【図１】この発明に従う空気入りタイヤのトレッドパタ
ーンの一部を示す図である。FIG. 1 is a diagram showing a part of a tread pattern of a pneumatic tire according to the present invention.
【図２】(a) は、図１に示すブロックパターンから1 個
のブロック陸部4cのみを抜き出して斜め上方から眺めた
図であり、(b) は、ブロック陸部の他の実施形態を示す
図である。2 (a) is a diagram showing only one block land portion 4c extracted from the block pattern shown in FIG. 1 and viewed obliquely from above, and FIG. 2 (b) shows another embodiment of the block land portion. FIG.
【図３】(a),(b),(c) はブロック陸部の別の実施形態を
示す図であり、(a) は斜視図、(b) は正面図、(c) は側
面図である。3 (a), 3 (b) and 3 (c) are views showing another embodiment of the block land portion, where (a) is a perspective view, (b) is a front view, and (c) is a side view. It is.
【図４】(a),(b) は、ブロック陸部の他の実施形態を示
す図であり、(a) は平面図、(b) は斜視図である。FIGS. 4A and 4B are diagrams showing another embodiment of a block land portion, wherein FIG. 4A is a plan view and FIG. 4B is a perspective view.
【図５】(a),(b) は、従来タイヤのブロック陸部を示す
図であり、(a) は平面図、(b) は斜視図である。5 (a) and 5 (b) are diagrams showing a block land portion of a conventional tire, where (a) is a plan view and (b) is a perspective view.
1 トレッド部 2a〜2d 周方向溝 3 横断溝 4,4a〜4e ブロック陸部 5 タイヤ周方向 6 タイヤ幅方向 7 ブロック陸部４の踏面輪郭 7a〜7e 踏面輪郭７を形成する辺 8a〜8d ブロック陸部の側壁 9 側壁端部 10 側壁中央部 11 ブロック陸部４の踏面 12 側壁上辺 13 側壁底辺 101 ブロック陸部 102 タイヤ周方向 103 ブロック陸部の踏面 104a〜104d ブロック陸部の側壁 105 側壁中央部 106,107 側壁端部 1 Tread portion 2a ~ 2d Circumferential groove 3 Crossing groove 4,4a ~ 4e Block land portion 5 Tire circumferential direction 6 Tire width direction 7 block Tread surface contour of land portion 4 7a ~ 7e Side forming tread surface contour 7 8a ~ 8d block Land side wall 9 Side wall end 10 Side wall center part 11 Tread surface of block land part 4 12 Side wall upper side 13 Side wall bottom 101 Block land part 102 Tire circumferential direction 103 Block land part tread surface 104a-104d Block land side wall 105 Side wall center Part 106,107 Side wall end
Claims (6)
区分形成してなる空気入りタイヤにおいて、 ブロック陸部の踏面輪郭形状は、直線又は曲線を１辺と
する４辺以上で構成される多辺形状であり、ブロック陸
部の側壁のうち、少なくとも前記１辺に対応する所定の
側壁は、その踏面とのなす交角（θ）が、側壁端部で側
壁中央部に比べて大きいことを特徴とする空気入りタイ
ヤ。1. A pneumatic tire in which a plurality of block land portions are separately formed in a tread portion, wherein the tread surface contour shape of the block land portion is composed of four or more sides each having a straight line or a curve as one side. It is a multi-sided shape, and among the side walls of the block land portion, at least the predetermined side wall corresponding to the one side has an intersection angle (θ) with the tread surface that is larger at the side wall end portion than at the side wall center portion. Features pneumatic tires.
中央部から側壁端部に向かうにつれて漸増する形状を有
する請求項１に記載した空気入りタイヤ。2. The pneumatic tire according to claim 1, wherein the predetermined side wall has a shape in which the intersection angle (θ) gradually increases from a center part of the side wall to an end part of the side wall.
中央部で90〜105 °の範囲、側壁端部で95〜120 °の範
囲である請求項１又は２に記載した空気入りタイヤ。3. The pneumatic tire according to claim 1, wherein the intersection angle (θ) of the predetermined side wall is in a range of 90 to 105 ° at a center portion of the side wall and in a range of 95 to 120 ° at an end portion of the side wall. .
対応する側壁を前記所定側壁とする請求項１、２又は３
に記載した空気入りタイヤ。4. The side wall corresponding to the one side of the side wall of the block land portion is defined as the predetermined side wall.
The pneumatic tire described in the above.
前記２辺に対応する側壁を前記所定側壁とする請求項
１、２又は３に記載した空気入りタイヤ。5. The pneumatic tire according to claim 1, wherein a side wall corresponding to the two opposite sides of the side wall of the block land portion is the predetermined side wall.
する請求項１、２又は３に記載した空気入りタイヤ。6. The pneumatic tire according to claim 1, wherein all the side walls of the block land portion are the predetermined side walls.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10088354A JPH11286204A (en) | 1998-04-01 | 1998-04-01 | Pneumatic tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10088354A JPH11286204A (en) | 1998-04-01 | 1998-04-01 | Pneumatic tire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11286204A true JPH11286204A (en) | 1999-10-19 |
Family
ID=13940492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10088354A Withdrawn JPH11286204A (en) | 1998-04-01 | 1998-04-01 | Pneumatic tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11286204A (en) |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001171317A (en) * | 1999-12-17 | 2001-06-26 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| JP2002019419A (en) * | 2000-07-06 | 2002-01-23 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| US6474381B1 (en) * | 1999-07-26 | 2002-11-05 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire including axial grooves |
| JP2003072323A (en) * | 2001-09-04 | 2003-03-12 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| JP2003182311A (en) * | 2001-12-21 | 2003-07-03 | Bridgestone Corp | Pneumatic tire |
| JP2004098943A (en) * | 2002-09-11 | 2004-04-02 | Toyo Tire & Rubber Co Ltd | Pneumatic tire |
| KR100462199B1 (en) * | 2000-11-23 | 2004-12-16 | 한국타이어 주식회사 | Pneumatic tire for preventing irregular wear |
| US7290578B2 (en) * | 2004-12-30 | 2007-11-06 | The Goodyear Tire & Rubber Company | Tire tread having a tread block with an undercut design |
| US7392832B2 (en) * | 2004-12-28 | 2008-07-01 | The Goodyear Tire & Rubber Company | Pneumatic tire having tread blocks with skewed walls |
| JP2013035346A (en) * | 2011-08-04 | 2013-02-21 | Bridgestone Corp | Tire |
| US20150258859A1 (en) * | 2013-03-13 | 2015-09-17 | Garth L. Magee | Aerodynamic tire tread |
| US20180022164A1 (en) * | 2015-03-18 | 2018-01-25 | Bridgestone Corporation | Tire |
| US20180043738A1 (en) * | 2015-03-18 | 2018-02-15 | Bridgestone Corporation | Tire |
| US20180043739A1 (en) * | 2015-03-23 | 2018-02-15 | Bridgestone Corporation | Tire |
| US20180281529A1 (en) * | 2017-03-30 | 2018-10-04 | Sumitomo Rubber Industries, Ltd. | Tire |
| CN109130708A (en) * | 2018-08-13 | 2019-01-04 | 厦门正新橡胶工业有限公司 | The venture automobile-used air tread pattern structure of pulling force |
| US11040578B2 (en) * | 2015-06-03 | 2021-06-22 | Bridgestone Corporation | Pneumatic tire |
-
1998
- 1998-04-01 JP JP10088354A patent/JPH11286204A/en not_active Withdrawn
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6474381B1 (en) * | 1999-07-26 | 2002-11-05 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire including axial grooves |
| JP2001171317A (en) * | 1999-12-17 | 2001-06-26 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| JP2002019419A (en) * | 2000-07-06 | 2002-01-23 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| KR100462199B1 (en) * | 2000-11-23 | 2004-12-16 | 한국타이어 주식회사 | Pneumatic tire for preventing irregular wear |
| JP2003072323A (en) * | 2001-09-04 | 2003-03-12 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| JP2003182311A (en) * | 2001-12-21 | 2003-07-03 | Bridgestone Corp | Pneumatic tire |
| JP2004098943A (en) * | 2002-09-11 | 2004-04-02 | Toyo Tire & Rubber Co Ltd | Pneumatic tire |
| US7392832B2 (en) * | 2004-12-28 | 2008-07-01 | The Goodyear Tire & Rubber Company | Pneumatic tire having tread blocks with skewed walls |
| KR101261048B1 (en) * | 2004-12-30 | 2013-05-06 | 더 굿이어 타이어 앤드 러버 캄파니 | Tire tread having a tread block with an undercut design |
| US7290578B2 (en) * | 2004-12-30 | 2007-11-06 | The Goodyear Tire & Rubber Company | Tire tread having a tread block with an undercut design |
| JP2013035346A (en) * | 2011-08-04 | 2013-02-21 | Bridgestone Corp | Tire |
| US20150258859A1 (en) * | 2013-03-13 | 2015-09-17 | Garth L. Magee | Aerodynamic tire tread |
| US20180022164A1 (en) * | 2015-03-18 | 2018-01-25 | Bridgestone Corporation | Tire |
| US20180043738A1 (en) * | 2015-03-18 | 2018-02-15 | Bridgestone Corporation | Tire |
| US20180043739A1 (en) * | 2015-03-23 | 2018-02-15 | Bridgestone Corporation | Tire |
| US11040578B2 (en) * | 2015-06-03 | 2021-06-22 | Bridgestone Corporation | Pneumatic tire |
| US20180281529A1 (en) * | 2017-03-30 | 2018-10-04 | Sumitomo Rubber Industries, Ltd. | Tire |
| JP2018167718A (en) * | 2017-03-30 | 2018-11-01 | 住友ゴム工業株式会社 | tire |
| US11046121B2 (en) * | 2017-03-30 | 2021-06-29 | Sumitomo Rubber Industries, Ltd. | Tire |
| CN109130708A (en) * | 2018-08-13 | 2019-01-04 | 厦门正新橡胶工业有限公司 | The venture automobile-used air tread pattern structure of pulling force |
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