JPH11227421A - Pneumatic radial tire - Google Patents

Pneumatic radial tire

Info

Publication number
JPH11227421A
JPH11227421A JP10035946A JP3594698A JPH11227421A JP H11227421 A JPH11227421 A JP H11227421A JP 10035946 A JP10035946 A JP 10035946A JP 3594698 A JP3594698 A JP 3594698A JP H11227421 A JPH11227421 A JP H11227421A
Authority
JP
Japan
Prior art keywords
tread
groove
circumferential
area
pneumatic radial
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.)
Granted
Application number
JP10035946A
Other languages
Japanese (ja)
Other versions
JP4201868B2 (en
Inventor
Naoya Ochi
直也 越智
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.)
Bridgestone Corp
Original Assignee
Bridgestone Corp
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 Bridgestone Corp filed Critical Bridgestone Corp
Priority to JP03594698A priority Critical patent/JP4201868B2/en
Publication of JPH11227421A publication Critical patent/JPH11227421A/en
Application granted granted Critical
Publication of JP4201868B2 publication Critical patent/JP4201868B2/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
    • B60C11/0304—Asymmetric patterns
    • 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
    • B60C2011/0374—Slant grooves, i.e. having an angle of about 5 to 35 degrees to the equatorial plane

Landscapes

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

Abstract

PROBLEM TO BE SOLVED: To allow the drainage performance and the moving performance to be compatible with each other in a high-performance tire at a high dimension. SOLUTION: A tread part is divided into two areas 2, 3 by a circumferential groove 1 formed in the center area of the tread part. Inclined grooves 4, 5 extending from the circumferential groove 1 toward the tread end are arranged in the areas 2, 3 respectively. The angles θ1 , θ2 of the inclined groove 4 to the circumferential direction of the tread, and the circumferential lengths d1 , d2 of a land 6 partitioned by the inclined grooves 4, are smaller on the circumferential groove 1 side than on the tread end side. In an acute angle-corner part on the circumferential groove 1 side of the land 6 nipped by the inclined grooves 4 in the area 2, an inclined surface in which the height of the land is gradually reduced toward the end edge of the land, is provided over 10 mm or more from the land edge.

Description

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

【０００１】[0001]

【発明の属する技術分野】この発明は、ウエット路面に
おける排水性能の向上と、ドライ路面での運動性能の向
上とを高い次元で両立させることができる高性能空気入
りラジアルタイヤ、なかでも、改良されたトレッドパタ
ーンに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-performance pneumatic radial tire capable of achieving both a high level of drainage performance on a wet road surface and a high level of athletic performance on a dry road surface. Tread pattern.

【０００２】[0002]

【従来の技術】従来の高性能空気入りラジアルタイヤと
しては、トレッド周方向に直線状に連続する周溝と、相
互に矢筈状に延びるそれぞれの傾斜溝とを組合わせたト
レッドパタンを有するものが一般的であり、ここで、ウ
エット路面における排水性能の向上は、溝面積を大きく
することにより、また、ドライ路面での、操縦安定性、
コーナリング性、グリップ等の運動性能の向上は、溝面
積を小さくしてブロック剛性を高めることで、それぞれ
実現することとしている。2. Description of the Related Art A conventional high performance pneumatic radial tire has a tread pattern in which a circumferential groove linearly continuous in the circumferential direction of a tread and respective inclined grooves extending in an arrowhead shape are combined. In general, here, the improvement of drainage performance on wet roads is achieved by increasing the groove area,
Improvements in cornering performance and exercise performance such as grip are realized by reducing the groove area and increasing the block rigidity.

【０００３】[0003]

【発明が解決しようとする課題】ところで、通常のパタ
ーン構成では、溝面積を大きくして排水性能を向上させ
るに当り、数本の周方向溝をもってトレッド陸部を区分
して複数のブロック列を形成することが一般的である
が、溝面積を大きくして陸部面積を小さくしたり、周方
向溝によってトレッド陸部を小さいブロックに区分して
陸部剛性を小さくしたりする場合には、ドライ路面での
運動性能が自ずと低下することになるという問題があ
る。By the way, in the ordinary pattern configuration, in order to increase the groove area and improve drainage performance, a plurality of block rows are divided by dividing the tread land portion with several circumferential grooves. It is common to form, but to increase the groove area to reduce the land area, or to divide the tread land into small blocks by circumferential grooves to reduce the land rigidity, There is a problem that exercise performance on a dry road surface is naturally reduced.

【０００４】そこでこの発明は、相互に二律背反の関係
にある排水性能と運動性能とのそれぞれを高い次元で両
立させることができる空気入りラジアルタイヤを提供す
る。Accordingly, the present invention provides a pneumatic radial tire capable of achieving both high levels of drainage performance and kinetic performance, which are mutually exclusive.

【０００５】[0005]

【課題を解決するための手段】この発明の空気入りラジ
アルタイヤは、トレッド部の中央領域に形成した少なく
とも一本、好ましくは一本だけの周溝によってトレッド
部を二つの区域に区分するとともに、それぞれの区域
に、周溝からトレッド端に向けて延びる複数本の傾斜溝
を配設し、少なくとも一方の区域、より好ましくは一方
の区域だけで、傾斜溝の、トレッド周方向に対する角度
および、その傾斜溝にて区画される陸部の周方向長さの
それぞれをともに、周溝側でトレッド端側より小さくし
たところにおいて、少なくとも一方の区域の傾斜溝によ
って挟まれる陸部の、周溝側の鋭角隅部に、それの端縁
から１０mm以上の長さにわたり、陸部表面高さをその端
縁に向けて漸減させる傾斜表面を設けたものである。A pneumatic radial tire according to the present invention divides a tread portion into two sections by at least one, and preferably only one, peripheral groove formed in a central region of the tread portion. In each area, a plurality of inclined grooves extending from the circumferential groove toward the tread end are provided, and in at least one area, more preferably only one area, the angle of the inclined groove with respect to the tread circumferential direction and its angle When each of the circumferential lengths of the land portions defined by the inclined grooves is smaller than the tread end side on the circumferential groove side, at least one of the land portions sandwiched by the inclined grooves on the circumferential groove side, on the circumferential groove side The sharp corner is provided with a sloped surface over a length of at least 10 mm from the edge thereof, which gradually reduces the land surface height toward the edge.

【０００６】なおここで、トレッド部の中央領域とは、
タイヤのトレッド幅を４等分したときのトレッドセンタ
を含むトレッド幅の１／２の領域を意味するものとし、
また、陸部の端縁からの長さとは、その陸部の、それぞ
れの位置での周方向長さの中点を通る中心線分に沿って
測った長さを意味するものとする。Here, the central region of the tread portion is
It shall mean a half of the tread width including the tread center when the tread width of the tire is divided into four equal parts,
The length from the edge of the land portion means a length of the land portion measured along a center line passing through a midpoint of a circumferential length at each position.

【０００７】またここで、傾斜表面は、平坦面の他、上
記中心線分を通る断面内および、その中心線分と直交す
る断面内の少なくとも一方で、半径方向外方に幾分凸と
なる曲面をも含むものとし、この傾斜表面は、陸部の端
縁で、それの表面高さを実質的に零とするものの他、そ
の端縁に高さを残すものとすることもできる。Here, the inclined surface is, in addition to the flat surface, at least one of a cross section passing through the center line and a cross section orthogonal to the center line, and is slightly convex outward in the radial direction. The inclined surface may include a curved surface, and the inclined surface may have a height of substantially zero at the edge of the land portion or may have a height at the edge.

【０００８】このようなタイヤにおいてより好ましく
は、前記傾斜表面を、鋭角隅部の端縁から１０〜８０mm
までの範囲の長さにわたって設ける。[0008] More preferably, in such a tire, the inclined surface is 10 to 80 mm from the edge of the sharp corner.
Over the length of

【０００９】また好ましくは、傾斜表面の形成部分の、
トレッド幅方向の寸法比率を、トレッド幅に対して５０
％以上とする。[0009] Also, preferably, the portion where the inclined surface is formed,
The dimensional ratio in the tread width direction is 50
% Or more.

【００１０】このように構成してなるタイヤでは、主に
は、トレッド部中央領域の周溝をもってすぐれた排水性
能を確保することができ、また、少なくとも一方の区域
の傾斜溝の、トレッド周方向に対する角度を周溝側で小
さくすることで、排水性能の一層の向上をもたらし、そ
して、その傾斜溝の、トレッド端側での同様の角度を大
きくすることで、ドライ路面での運動性能を高め、併せ
て、耐偏摩耗性能を高めることができる。In the tire configured as above, excellent drainage performance can be mainly ensured by the circumferential groove in the central region of the tread portion, and at least one of the inclined grooves in the circumferential direction in the tread portion can be secured. By reducing the angle on the circumferential groove side, the drainage performance is further improved, and by increasing the angle of the inclined groove on the tread end side, the exercise performance on dry road surface is improved. In addition, uneven wear resistance performance can be enhanced.

【００１１】しかも、上記傾斜溝によって区画される陸
部につき、それの周方向長さを周溝側で短かくすること
で、排水性能のさらなる向上を実現することができ、こ
のことは、その周方向長さを、周溝側で極端に短かくし
て、その陸部を鋭角に尖らせた場合にとくに顕著であ
る。この一方で、陸部の周方向長さをトレッド端側で長
くすることで、ドライ路面での運動性能および耐偏摩耗
性能をより一層向上させることができる。[0011] In addition, by reducing the circumferential length of the land portion defined by the inclined groove on the circumferential groove side, it is possible to further improve the drainage performance. This is particularly noticeable when the length in the circumferential direction is extremely shortened on the circumferential groove side and the land portion is sharpened at an acute angle. On the other hand, by increasing the length of the land portion in the circumferential direction on the tread end side, it is possible to further improve the exercise performance on dry road surfaces and the uneven wear resistance.

【００１２】なおこの場合には、陸部の、周溝側の鋭角
隅部での剛性が小さくなって、ドライ路面での運動性能
の他、耐偏摩耗性能の低下のうれいがあるので、ここで
は、鋭角隅部に、その端縁から１０mm以上の長さにわた
って、陸部表面高さの漸減をもたらす傾斜表面を設ける
ことでそれに対処している。In this case, the rigidity of the land portion at the sharp corners on the circumferential groove side is reduced, and there is a decrease in the kinetic performance on a dry road surface and the uneven wear resistance. Here, this is addressed by providing a beveled surface at the sharp corner that provides a gradual decrease in land surface height over a length of 10 mm or more from its edge.

【００１３】ここで、傾斜表面の形成部分を１０mm以上
の長さとするのは、それが１０mm未満では、鋭角隅部の
剛性の低い部分がより多く接地するため、その部分の偏
摩耗（異常摩耗）等の懸念がある。ところで、このよう
にして形成した傾斜表面もまた、現実には、排水性能の
向上に有効に寄与し得ることが確認されている。The reason why the length of the sloped surface is 10 mm or more is that if the length of the sloped surface is less than 10 mm, the low-rigidity portions at the sharp corners are more in contact with the ground. ) Etc. By the way, it has been confirmed that the inclined surface thus formed can also effectively contribute to the improvement of drainage performance.

【００１４】これに対し、傾斜表面を、鋭角隅部端縁か
ら８０mmを越える長さにわたって形成した場合には、接
地面積が不足して、ドライ路面でのすぐれた運動性能を
確保できなくなるおそれがあるので、好ましくは、その
傾斜表面の形成長さを１０〜８０mmの範囲内とする。On the other hand, if the inclined surface is formed over a length exceeding 80 mm from the edge of the sharp corner, there is a possibility that the ground contact area becomes insufficient, and it becomes impossible to secure excellent exercise performance on a dry road surface. Therefore, preferably, the length of the inclined surface is set in the range of 10 to 80 mm.

【００１５】その上、なるべく小さい溝面積をもって排
水効率を高めるためには、トレッド幅に対する、傾斜表
面形成部分のトレッド幅方向の寸法比率を５０％以上と
すること、なかでも、５４〜７０％とすることが好まし
い。すなわち、この寸法比率が５０％未満では、傾斜表
面の作用下での排水性能の向上を十分実効あるものとす
ることが難しく、この一方で、７０％を越えると、すぐ
れた運動性能の確保が困難になるおそれがあり、耐偏摩
耗性能もまた低下傾向を示すことになる。In addition, in order to increase drainage efficiency with as small a groove area as possible, the dimensional ratio of the inclined surface forming portion in the tread width direction to the tread width should be 50% or more, and especially 54 to 70%. Is preferred. That is, if the dimensional ratio is less than 50%, it is difficult to sufficiently improve the drainage performance under the action of the inclined surface, while if it exceeds 70%, excellent exercise performance is secured. It may be difficult, and the uneven wear resistance performance also tends to decrease.

【００１６】ところで、このようなタイヤにおいては、
なるべく少ない本数の周溝を配設するとともに、タイヤ
の車両への装着姿勢の下で、車両の内側に位置すること
になる部分と、外側に位置することになる部分とを機能
分離させて、内側となる部分によってとくに高い排水性
能を、そして外側となる部分によってとくにすぐれた運
動性能をそれぞれもたらすことが一層好ましい。なおこ
の場合にあっても、車両の内側に位置することになる部
分にても適宜の運動性能の発揮が必要であることはもち
ろんであり、これがため、このタイヤでは、前述したよ
うに、傾斜溝にて区画される鋭角隅部に傾斜表面を形成
している。By the way, in such a tire,
Along with arranging as few peripheral grooves as possible, under the mounting posture of the tire on the vehicle, the part that will be located inside the vehicle and the part that will be located outside will be functionally separated, It is further preferred that the inner part provides a particularly high drainage performance and the outer part provides a particularly good athletic performance. In this case, it is needless to say that appropriate exercise performance must be exhibited even in a portion that is to be located inside the vehicle. An inclined surface is formed at an acute corner defined by the groove.

【００１７】そこで、かかるタイヤにおいて上述のよう
な機能分離を有利に実現するべく、好ましくは、周溝に
対し、前記一方の区域とは反対側の区域に区画される陸
部を、周溝側の鋭角隅部に、その端縁側への陸部表面高
さの漸減部をほとんどもしくは全く有しないものとし、
これによって陸部剛性の低下を防止して運動性能の向上
を担保する。なおここにおいて、陸部表面高さの漸減部
を設けた場合には、轍乗り越し性能が改善されることに
なる。Therefore, in order to advantageously realize the above-described function separation in such a tire, preferably, the land portion partitioned into the area opposite to the one area with respect to the circumferential groove is formed on the circumferential groove side. Shall have little or no tapered portion of the land surface height at the sharp corner of
As a result, a decrease in rigidity of the land portion is prevented, and the improvement of the exercise performance is ensured. Here, in the case where the gradually decreasing portion of the land surface height is provided, the performance over the rut is improved.

【００１８】そしてこのことは、周溝に対し、前記一方
の区域とは反対側の区域に延在する傾斜溝の、トレッド
周方向に対する角度を、前記一方の区域に延在する傾斜
溝の、少なくとも周溝側部分でのそれより大きくすると
ともに、その反対側の区域に区画される陸部の周方向長
さをその全体にわたってほぼ等しくした場合にとくに顕
著であり、これによれば、運動性能を大きく向上させる
ことができる。すなわち、前記一方の区域では、排水効
率の向上を目的に、傾斜溝の、トレッド周方向に対する
角度をできるだけ小さくし、また、他方の区域では、運
動性能の向上を目的に、傾斜溝の同様な角度をなるべく
大きくするとともに、陸部寸法を、周溝側からトレッド
端側までほぼ等しくし、これによって、耐偏摩耗性能の
向上をも併せて実現する。This means that, with respect to the circumferential groove, the angle of the inclined groove extending in the area opposite to the one area with respect to the tread circumferential direction is determined by changing the angle of the inclined groove extending in the one area. This is particularly remarkable when the circumferential length of the land portion defined at least on the circumferential groove side portion is substantially equal to the circumferential length of the land portion defined on the opposite side. Can be greatly improved. That is, in one area, the angle of the inclined groove with respect to the circumferential direction of the tread is made as small as possible for the purpose of improving drainage efficiency, and in the other area, the same angle of the inclined groove is used for the purpose of improving exercise performance. The angle is made as large as possible, and the dimensions of the land portion are made substantially equal from the circumferential groove side to the tread end side, whereby the uneven wear resistance is also improved.

【００１９】また、タイヤの機能分離は、前記一方の区
域を、車両への装着姿勢のタイヤの車両の内側となる部
分に形成した場合により十分に行われることになり、車
両の外側に位置することになる陸部は、ウェット路面お
よびドライ路面における旋回性能の向上をもたらす。ま
た、排水性能を、主には、車両の内側に位置する部分に
発揮させることで、車両の外側方向への排水の飛散を有
効に抑制することができる。Further, the separation of the functions of the tire is performed more sufficiently when the one area is formed in a portion of the tire mounted on the vehicle inside the vehicle, and is located outside the vehicle. The different land portions provide improved turning performance on wet and dry road surfaces. In addition, by making the drainage performance mainly exhibited at a portion located inside the vehicle, it is possible to effectively suppress the scattering of the drainage to the outside of the vehicle.

【００２０】そして、車両の外側となる部分の陸部剛性
および接地面積は、前記一方の区域に延びる傾斜溝の溝
幅に対し、他方の区域に延びる傾斜溝の溝幅を狭くした
場合により増加させることができ、これによって運動性
能をさらに向上させることができる。The land rigidity and the ground contact area of the portion outside the vehicle are more increased when the width of the inclined groove extending to the other area is narrower than the groove width of the inclined groove extending to the other area. And exercise performance can be further improved.

【００２１】[0021]

【発明の実施の形態】以下にこの発明の実施の形態を図
面に示すところに基いて説明する。図１はこの発明のの
実施形態を示すトレッドパターンの展開図であり、図中
１は、トレッド部の中央領域に形成され、図ではトレッ
ドセンタＣより幾分右側にずれた位置で、周方向に直線
状に連続して延びる広幅の周溝を示す。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a development view of a tread pattern showing an embodiment of the present invention. In FIG. 1, 1 is formed in a central region of a tread portion, and is slightly shifted rightward from a tread center C in FIG. Shows a wide circumferential groove extending linearly and continuously.

【００２２】ここでは、この一本の周溝１により、トレ
ッド部を、図の左側に位置する一方の区域２と、他方の
区域３とに区分するとともに、それらのそれぞれの区域
２，３に、周溝１からトレッド端に向けて延びる複数本
の傾斜溝４，５を配設し、これらの傾斜溝４，５の相互
をほぼ矢筈状に延在させて、それらの相互を、周溝側で
接近させる一方、トレッド端側で離隔させる。Here, the tread portion is divided into one section 2 located on the left side of the drawing and the other section 3 by the one circumferential groove 1 and is divided into the respective sections 2 and 3. , A plurality of inclined grooves 4 and 5 extending from the circumferential groove 1 toward the tread end are arranged, and these inclined grooves 4 and 5 are extended substantially in the shape of an arrow. Side, while separating at the tread edge.

【００２３】またここでは、一方の区域２に延在する傾
斜溝４の溝幅を、他方の区域３に延びる傾斜溝５の溝幅
より広くするとともに、その傾斜溝４のトレッド周方向
に対する角度を周溝側でトレッド端側より小さくし（θ
1 ＜θ2 ）、併せて、傾斜溝４によって区画される陸部
６の周方向長さを周溝側でトレッド端側より短くする
（ｄ1 ＜ｄ2 ）。Here, the groove width of the inclined groove 4 extending to one area 2 is made wider than the groove width of the inclined groove 5 extending to the other area 3, and the angle of the inclined groove 4 with respect to the tread circumferential direction is set. Is smaller on the circumferential groove side than on the tread end side (θ
1 <θ 2 ), and the circumferential length of the land portion 6 defined by the inclined groove 4 is shorter on the circumferential groove side than on the tread end side (d 1 <d 2 ).

【００２４】そしてまた、他方の区域３に延びる傾斜溝
５の、トレッド周方向に対する角度、たとえば角度θ3
を、一方の区域２に延在する傾斜溝４の、少なくとも周
溝側部分の角度θ1 より大きくするとともに、その他方
の区域３で、傾斜溝５間に区画される陸部７の周方向長
さを、それの全体にわたってほぼ等しくする。The angle of the inclined groove 5 extending to the other area 3 with respect to the circumferential direction of the tread, for example, the angle θ 3
Is larger than the angle θ 1 of at least the circumferential groove side portion of the inclined groove 4 extending to one section 2, and the circumferential direction of the land portion 7 partitioned between the inclined grooves 5 in the other section 3. The length is approximately equal throughout it.

【００２５】さらには、一方の区域２で、傾斜溝４によ
って挟まれる陸部６の、周溝側の鋭角隅部に、その端縁
から１０mm以上の長さＤにわたって、陸部６の表面高さ
をその端縁に向けて漸減させる、図に斜線を施して示す
ような傾斜表面８を設ける。ここで、陸部６の鋭角隅部
の端縁からの長さＤは、先にも述べたように、その陸部
の延在方向のそれぞれの位置での周方向長さの中点を通
る中心線分Ｏに沿って測った長さとする。Further, in one area 2, the land height of the land portion 6 sandwiched by the inclined grooves 4 is set at an acute corner on the circumferential groove side of the land portion 6 over a length D of 10 mm or more from the edge. An inclined surface 8 is provided, which is tapered toward the edge, as shown in the figure by hatching. Here, the length D from the edge of the acute corner of the land portion 6 passes through the midpoint of the circumferential length at each position in the extending direction of the land portion, as described above. The length is measured along the center line O.

【００２６】またここにおける傾斜表面８は、平坦表面
をもって形成できることはもちろんであるが、図のａ−
ａ線およびｂ−ｂ線に沿う断面をそれぞれ示す図２
（ａ），（ｂ）から明らかなように、前記中心線分Ｏの
延在方向および、それと直交する方向のいずれにおいて
も、図の上面側に幾分凸となる曲面形状表面にて形成す
ることもでき、それらのいずれか一方にのみが凸となる
曲面形状表面にて形成することもできる。そして、この
ような傾斜表面８は、図２（ａ）に示すように、陸部６
の端縁でその表面高さを実質的に零とするものまたは、
その端縁に幾分の表面高さを残すものとすることができ
る。It is needless to say that the inclined surface 8 can be formed with a flat surface.
FIG. 2 showing a cross section along line a and line bb, respectively.
As is clear from (a) and (b), in both the extending direction of the center line segment O and the direction perpendicular thereto, the center line segment O is formed with a curved surface slightly convex on the upper surface side in the drawing. It can also be formed on a curved surface where only one of them is convex. And, as shown in FIG.
The surface height of which is substantially zero, or
Some surface height may be left at the edge.

【００２７】なおここで、他方の区域３に区画される陸
部７の、周溝側の鋭角隅部については、陸部表面高さを
その端縁側に向けて次第に低下させる高さ漸減部から完
全に解放することまたは、表面高さをわずから減少させ
るだけの漸減部を設けることもできる。Here, the sharp corners on the circumferential groove side of the land portion 7 defined in the other area 3 are formed from a gradually decreasing portion which gradually lowers the land surface height toward the edge. It is also possible to provide a complete release or a taper which only slightly reduces the surface height.

【００２８】ところで、図１に示すところではさらに、
陸部６に、トレッド端側から、それの延在方向のほぼ中
央部分まで、前記中心線分Ｏに近接して延びるととも
に、その中央部分より周溝側では、図の下方側に凸とな
る曲線状に湾曲して延在して、隣接する傾斜溝４に達す
る細溝９を設け、また、それぞれ細溝９の湾曲部分間
に、それらの湾曲部分とほぼ平行に延びて二本の陸部６
を完全に横切るサイプ１０を形成する。そしてまた、他
方の区域３の陸部７には、それを周方向にほぼ二等分す
る細溝１１を設ける。これらのことによれば、それぞれ
の細溝９，１１およびサイプ１０をもって、それぞれの
陸部６，７の接地性を十分に高めて、操縦安定性の他、
耐偏耐摩性能、ウェット路面等の低ミュー路での路面グ
リップ力等をより一層向上させることができ、また、小
ブロック化することでパターンノイズを低減させること
もできる。By the way, in the place shown in FIG.
The land portion 6 extends from the tread end side to a substantially central portion in the extending direction of the land portion 6 in the vicinity of the center line segment O, and the circumferential groove side from the central portion protrudes downward in the drawing. Narrow grooves 9 are provided which extend in a curved manner to reach the adjacent inclined grooves 4, and two land portions each extending between the curved portions of the narrow groove 9 and extending substantially parallel to the curved portions. Part 6
To form a sipe 10 completely across the sipe 10. Further, the land portion 7 of the other area 3 is provided with a narrow groove 11 which divides the land portion into approximately two in the circumferential direction. According to these, each of the narrow grooves 9, 11 and the sipe 10 sufficiently enhances the contact property of each of the land portions 6, 7, and in addition to the steering stability,
The uneven abrasion resistance, the road surface grip force on a low-mu road such as a wet road surface, and the like can be further improved, and the pattern noise can be reduced by reducing the size of the block.

【００２９】このようなタイヤによれば、先にも述べた
ように、主には、周溝１と、一方の区域２の傾斜溝４
と、陸部６の鋭角隅部に設けた傾斜表面８等によってす
ぐれた排水性能をもたらすことができ、また、傾斜溝４
の、トレッド周方向に対する角度および陸部６の周方向
長さをトレッド端側へ次第に増加させること、前記傾斜
表面８を設けたこと等によって高い運動性能を確保し、
併せて、耐偏摩耗性能をもまた高めることができる。According to such a tire, as described above, mainly, the circumferential groove 1 and the inclined groove 4 in one area 2 are mainly provided.
And, excellent drainage performance can be provided by the inclined surface 8 or the like provided at the acute corner of the land portion 6.
The angle with respect to the tread circumferential direction and the circumferential length of the land portion 6 are gradually increased toward the tread end side, and the provision of the inclined surface 8 ensures high exercise performance.
At the same time, uneven wear resistance can also be enhanced.

【００３０】そして他方の区域３においては、傾斜溝５
の溝幅を、傾斜溝４のそれより狭くすること、そこに区
画される陸部７の鋭角隅部から、陸部表面高さの漸減部
をほとんどもしくは完全になくすること、傾斜溝５の、
トレッド周方向に対する角度を、傾斜溝４のそれより大
きくすること、陸部７の周方向長さをそれの全長にわた
ったほぼ等しくすること等をもって、陸部７の剛性を十
分高く、また十分均一ならしめて、運動性能および耐偏
摩耗性能をより向上させることができる。In the other area 3, the inclined groove 5
To make the groove width of the inclined groove 4 narrower than that of the inclined groove 4, and to eliminate almost or completely the gradually decreasing portion of the land portion surface height from the sharp corner of the land portion 7 defined therein. ,
The rigidity of the land portion 7 is sufficiently high and sufficient by making the angle with respect to the tread circumferential direction larger than that of the inclined groove 4 and making the circumferential length of the land portion 7 substantially equal to the entire length thereof. By uniforming, the exercise performance and the uneven wear resistance performance can be further improved.

【００３１】従って、図示のようなタイヤの、一方の区
域２を、車両への装着姿勢のタイヤの車両内側部分に、
また他方の区域３を、車両の外側部分にそれぞれ配設す
ることで、それぞれの区域２，３に特有の機能をとくに
効果的に発揮させることができ、ウェット路面における
排水性能と、ドライ路面での運動性能とを高い次元で両
立させることができる。Accordingly, one area 2 of the tire as shown is placed on the vehicle inner side of the tire in a mounting posture to the vehicle.
In addition, by arranging the other area 3 on the outer portion of the vehicle, the function unique to each area 2 and 3 can be exhibited particularly effectively, and the drainage performance on a wet road surface and the dry performance on a dry road surface can be improved. Kinetic performance can be achieved at a high level.

【００３２】[0032]

【実施例】トレッド幅が２００mmのＰＳＲ２１５／４５
Ｒ１７のタイヤにおいて、トレッドパターンを図１に示
す通りのものとし、また、陸部６に対する傾斜表面８の
形成態様を図２に示す通りとし、さらに、陸部７の、周
溝側壁面の上部に、図１のＣ−Ｃ線に沿う断面を示す図
３から明らかなように、半径５mmの面取りを施すととも
に、周溝１の幅を２０mm、傾斜溝４の溝幅を５mm、傾斜
溝５の溝幅を３．５mm、傾斜表面８の長さＤを６０mmと
し、トレッド幅に対する、傾斜表面８の形成部分のトレ
ッド幅方向の寸法比率を６５％としたものを実施例タイ
ヤとし、同サイズの、図４に示すトレッドパターンを有
するタイヤを比較タイヤとした場合における、直進走行
時および旋回走行時のそれぞれにおける耐ハイドロプレ
ーニング性能および、ドライ路面での操縦安定性につい
ての試験を行ったところ、表１に示す結果が得られた。
なお表中の指数値は大きいほどすぐれた結果を示すもの
とする。[Example] PSR215 / 45 with a tread width of 200 mm
In the tire of R17, the tread pattern is as shown in FIG. 1, the form of the inclined surface 8 with respect to the land portion 6 is as shown in FIG. 2, and the upper portion of the land portion 7 on the circumferential groove side wall surface As shown in FIG. 3 showing a cross section taken along the line CC in FIG. 1, a chamfer having a radius of 5 mm is performed, the width of the peripheral groove 1 is set to 20 mm, the width of the inclined groove 4 is set to 5 mm, Example tires having a groove width of 3.5 mm, a length D of the inclined surface 8 of 60 mm, and a dimensional ratio in the tread width direction of a portion where the inclined surface 8 is formed with respect to the tread width of 65% were obtained. When the tire having the tread pattern shown in FIG. 4 was used as a comparative tire, tests were performed on the hydroplaning resistance performance and the steering stability on a dry road surface during straight running and cornering, respectively. In addition, the results shown in Table 1 were obtained.
The larger the index value in the table, the better the result.

【００３３】[0033]

【表１】 [Table 1]

【００３４】ここで、上記試験に当っては、タイヤへの
充填空気圧を２．２kgf ／cm2 とするとともに、２名乗
車相当の負荷条件の実車走行において、直進走行時の耐
ハイドロプレーニング性能は、水深５mmのウェット路面
を、８０Km／ｈおよび９０Km／ｈのそれぞれの速度で走
行したときの残存接地面積を測定することによって求
め、旋回走行時の耐ハイドロプレーニング性能は、半径
が８０ｍで、水深が５mmのウェット旋回路面を走行時の
限界横Ｇを測定することにより求め、そして、ドライ路
面での操縦安定性は、ドライ状態のサーキットコースを
各種走行モードによりスポーツ走行した時のテストドラ
イバーのフィーリング評価により求めた。Here, in the above test, the air pressure charged into the tire was set to 2.2 kgf / cm 2 and the anti-hydroplaning performance during straight running in a real vehicle running under a load condition equivalent to two passengers. Is measured by measuring the remaining contact area when the vehicle travels on a wet road surface having a depth of 5 mm at a speed of 80 km / h and 90 km / h. The hydroplaning resistance during turning is 80 m and the water depth is 80 m / h. Is measured by measuring the critical lateral G when driving on a wet circuit surface of 5 mm, and the driving stability on dry road surface is determined by the test driver's feeling when running sports on a dry circuit course in various driving modes. It was determined by ring evaluation.

【００３５】表１によれば、実施例タイヤは、排水性能
および操縦安定性のいずれにおいても、比較タイヤより
はるかにすぐれていることが明らかであり、なかでも、
旋回走行時の耐ハイドロプレーニング性能の改善が著し
い。According to Table 1, it is clear that the Example tire is far superior to the Comparative tire in both drainage performance and steering stability.
The improvement in hydroplaning resistance during turning is remarkable.

【００３６】[0036]

【発明の効果】上記実施例からも明らかなように、この
発明によれば、とくには、ウェット路面における排水性
能とドライ路面での運動性能とを高い次元で両立させる
ことができる。As is clear from the above embodiment, according to the present invention, it is possible to achieve both a high drainage performance on a wet road surface and a high kinetic performance on a dry road surface.

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

【図１】この発明の実施形態を示すトレッドパターンの
展開図である。FIG. 1 is a development view of a tread pattern showing an embodiment of the present invention.

【図２】傾斜表面の形成態様を示す断面図である。FIG. 2 is a cross-sectional view illustrating a form of forming an inclined surface.

【図３】実施例タイヤの陸部の、周溝側壁面の面取り状
態を示す断面図である。FIG. 3 is a sectional view showing a chamfered state of a circumferential groove side wall surface of a land portion of the example tire.

【図４】比較タイヤのトレッドパターンを示す展開図で
ある。FIG. 4 is a developed view showing a tread pattern of a comparative tire.

【符号の説明】[Explanation of symbols]

１ 周溝 ２ 一方の区域 ２ 他方の区域 ４，５ 傾斜溝 ６，７ 陸部 ８ 傾斜表面 ９，１１ 細溝 １０ サイプ θ1 ，θ2 ，θ3 角度 ｄ1 ，ｄ2 周方向長さ Ｄ 長さ1 peripheral groove 2 one zone 2 other sections 4,5 inclined grooves 6,7 land portion 8 inclined surface 9, 11 narrow groove 10 sipe θ 1, θ 2, θ 3 angle d 1, d 2 circumferential length D length

Claims (7)

【特許請求の範囲】[Claims] 【請求項１】 トレッド部の中央領域に形成した少なく
とも一本の周溝によってトレッド部を二つの区域に区分
するとともに、それぞれの区域に、周溝からトレッド端
に向けて延びる複数本の傾斜溝を配設し、少なくとも一
方の区域の傾斜溝の、トレッド周方向に対する角度およ
び、その傾斜溝にて区画される陸部の周方向長さのそれ
ぞれを、前記周溝側でトレッド端側より小さくしてな
り、 少なくとも一方の区域の傾斜溝によって挟まれる陸部
の、周溝側の鋭角隅部に、それの端縁から１０mm以上の
長さにわたり、陸部表面高さをその端縁に向けて漸減さ
せる傾斜表面を設けてなる空気入りラジアルタイヤ。1. A tread portion is divided into two sections by at least one peripheral groove formed in a central region of the tread section, and a plurality of inclined grooves extending from the peripheral groove toward the tread end in each section. Arranged, the angle of the inclined groove of at least one section with respect to the tread circumferential direction, and each of the circumferential length of the land portion defined by the inclined groove is smaller on the circumferential groove side than on the tread end side. The land portion sandwiched by the inclined grooves in at least one area, at the acute corner on the circumferential groove side, extending over at least 10 mm from its edge, and directing the land surface height to the edge Pneumatic radial tire with an inclined surface that gradually decreases. 【請求項２】 前記傾斜表面を、鋭角隅部の端縁から１
０〜８０mmまでの範囲の長さにわたって設けてなる請求
項１に記載の空気入りラジアルタイヤ。2. The method according to claim 1, wherein the inclined surface is separated from the edge of the sharp corner by one.
The pneumatic radial tire according to claim 1, wherein the pneumatic radial tire is provided over a length ranging from 0 to 80 mm. 【請求項３】 前記傾斜表面の形成部分の、トレッド幅
方向の寸法比率を、トレッド幅に対して５０％以上とし
てなる請求項１もしくは２に記載の空気入りラジアルタ
イヤ。3. The pneumatic radial tire according to claim 1, wherein a dimensional ratio in a tread width direction of a portion where the inclined surface is formed is 50% or more with respect to the tread width. 【請求項４】 周溝に対し、前記一方の区域とは反対側
の区域に区画される陸部を、周溝側の鋭角隅部に、その
端縁側への陸部表面高さの漸減部をほとんどもしくは全
く有しないものとしてなる請求項１〜３のいずれかに記
載の空気入りラジアルタイヤ。4. A land portion divided into a region opposite to the one region with respect to the circumferential groove, a sharply-angled corner on the circumferential groove side, and a gradually decreasing portion of the land portion surface height to the edge thereof. The pneumatic radial tire according to any one of claims 1 to 3, wherein the pneumatic radial tire has little or no. 【請求項５】 周溝に対し、前記一方の区域とは反対側
の区域に延在する傾斜溝の、トレッド周方向に対する角
度を、前記一方の区域に延在する傾斜溝の少なくとも周
溝側部分でのそれより大きくするとともに、その反対側
の区域に区画される陸部の周方向長さをその全体にわた
ってほぼ等しくしてなる請求項１〜４のいずれかに記載
の空気入りラジアルタイヤ。5. An inclined groove extending in a region opposite to the one region with respect to the circumferential groove, an angle with respect to a tread circumferential direction is set at least on a peripheral groove side of the inclined groove extending in the one region. The pneumatic radial tire according to any one of claims 1 to 4, wherein the circumferential length of the land section defined in the area on the opposite side is made substantially equal throughout the entire area. 【請求項６】 前記一方の区域を、車両への装着姿勢の
タイヤの車両の内側となる部分に形成してなる請求項１
〜５のいずれかに記載の空気入りラジアルタイヤ。6. The vehicle according to claim 1, wherein the one area is formed in a portion of the tire mounted on the vehicle and located inside the vehicle.
A pneumatic radial tire according to any one of claims 1 to 5. 【請求項７】 前記反対側の区域に延在する傾斜溝の溝
幅を、前記一方の区域に延在する傾斜溝のそれより狭幅
とするとともに、その反対側の区域を、車両への装着姿
勢のタイヤの車両の外側となる部分に形成してなる請求
項１〜６のいずれかに記載の空気入りラジアルタイヤ。7. A groove width of the inclined groove extending to the opposite area is smaller than that of the inclined groove extending to the one area, and the opposite area is provided to the vehicle. The pneumatic radial tire according to any one of claims 1 to 6, wherein the pneumatic radial tire is formed on a portion of the tire in a mounting position outside the vehicle.
JP03594698A 1998-02-18 1998-02-18 Pneumatic radial tire Expired - Fee Related JP4201868B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP03594698A JP4201868B2 (en) 1998-02-18 1998-02-18 Pneumatic radial tire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP03594698A JP4201868B2 (en) 1998-02-18 1998-02-18 Pneumatic radial tire

Publications (2)

Publication Number Publication Date
JPH11227421A true JPH11227421A (en) 1999-08-24
JP4201868B2 JP4201868B2 (en) 2008-12-24

Family

ID=12456166

Family Applications (1)

Application Number Title Priority Date Filing Date
JP03594698A Expired - Fee Related JP4201868B2 (en) 1998-02-18 1998-02-18 Pneumatic radial tire

Country Status (1)

Country Link
JP (1) JP4201868B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112008002998T5 (en) 2007-11-06 2010-12-09 Toyo Tire & Rubber Co., Ltd. tire
JP2012106532A (en) * 2010-11-15 2012-06-07 Bridgestone Corp Pneumatic tire

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6452507A (en) * 1987-05-08 1989-02-28 Bridgestone Corp Pneumatic tire pair
JPH02212202A (en) * 1989-02-14 1990-08-23 Bridgestone Corp Pneaumatic tire
JPH05319025A (en) * 1992-05-25 1993-12-03 Bridgestone Corp Pneumatic tire
JPH07186618A (en) * 1993-12-27 1995-07-25 Yokohama Rubber Co Ltd:The Pneumatic radial tire for passenger car
JPH0885310A (en) * 1994-09-20 1996-04-02 Bridgestone Corp Pneumatic radial tire
JPH0891025A (en) * 1994-09-28 1996-04-09 Bridgestone Corp Pneumatic radial tire

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6452507A (en) * 1987-05-08 1989-02-28 Bridgestone Corp Pneumatic tire pair
JPH02212202A (en) * 1989-02-14 1990-08-23 Bridgestone Corp Pneaumatic tire
JPH05319025A (en) * 1992-05-25 1993-12-03 Bridgestone Corp Pneumatic tire
JPH07186618A (en) * 1993-12-27 1995-07-25 Yokohama Rubber Co Ltd:The Pneumatic radial tire for passenger car
JPH0885310A (en) * 1994-09-20 1996-04-02 Bridgestone Corp Pneumatic radial tire
JPH0891025A (en) * 1994-09-28 1996-04-09 Bridgestone Corp Pneumatic radial tire

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112008002998T5 (en) 2007-11-06 2010-12-09 Toyo Tire & Rubber Co., Ltd. tire
US8459320B2 (en) 2007-11-06 2013-06-11 Toyo Tire & Rubber Co., Ltd. Pneumatic tire with tread having chamfered surface
JP2012106532A (en) * 2010-11-15 2012-06-07 Bridgestone Corp Pneumatic tire

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