JPH02127106A - Pneumatic bias winter tire - Google Patents

Pneumatic bias winter tire

Info

Publication number
JPH02127106A
JPH02127106A JP63279290A JP27929088A JPH02127106A JP H02127106 A JPH02127106 A JP H02127106A JP 63279290 A JP63279290 A JP 63279290A JP 27929088 A JP27929088 A JP 27929088A JP H02127106 A JPH02127106 A JP H02127106A
Authority
JP
Japan
Prior art keywords
tread
cut
block
tire
blocks
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
Application number
JP63279290A
Other languages
Japanese (ja)
Inventor
Toru Fukuoka
徹 福岡
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 JP63279290A priority Critical patent/JPH02127106A/en
Publication of JPH02127106A publication Critical patent/JPH02127106A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To better unbalanced wear resistance characteristic so as to improve water removability, grounding ability and edge effect by making a tilt angle of a cut in a block in the tread center area to the tire peripheral direction smaller than the tilt angle of a cut in blocks in both side areas. CONSTITUTION:A tread T consists of the center area Tc and both side areas Ts, and the area Tc is divided into four at equal intervals in axial direction with a pair of peripheral directional grooves 1, 1 extending in peripheral direction at intervals in axial direction, and a central directional groove 1' dividing the axial directional intervals into two equal parts and extending parallel thereto. And, the tread T is divided into a number of blocks 2 with a number of lateral grooves 3 continuously extending from the tread end by crossing the grooves 1, 1 to the other end. A tilt angle Ss, to the tire peripheral direction, of a cut, in a block in area Tc and a tilt angle Ss, to the same direction, of a cut in a block in area Ts are made to satisfy a relation Sc<Ss. On account thereof, irregularity generation on the surface of a block due to wear on heel and toe on front and rear in the peripheral direction is reduced resulting in occurrence of unbalanced wear, and at the same time, over snow and over ice running performance can be improved.

Description

【発明の詳細な説明】 [発明の目的コ (産業上の利用分野) 本発明は空気入りバイアス冬タイヤの改良に関し、さら
に詳しくは、雪上および氷上走行性能を維持しつつ、耐
偏摩耗特性を改善してなる、特に重荷重用として適した
空気入りバイアス冬タイヤに関するものである。
DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention (Industrial Application Field) The present invention relates to an improvement in a pneumatic bias winter tire, and more specifically, to an improvement in a pneumatic bias winter tire, and more specifically, to improve uneven wear resistance while maintaining performance on snow and ice. This invention relates to an improved pneumatic bias winter tire particularly suitable for heavy loads.

(従来の技術) 近年、スパイク公害などの種々の問題から、スパイクを
有さない雪上および氷上走行用タイヤが開発され、特に
乗用車向けとしてはスタッドレスタイヤ(オールウェザ
−タイヤとも称する)が急増している。
(Prior Art) In recent years, due to various problems such as spike pollution, tires for driving on snow and ice without spikes have been developed, and studless tires (also called all-weather tires) are rapidly increasing especially for passenger cars. .

そして、これらのスタッドレスタイヤは、トレッドに形
成した特有のブロックの構造により雪上および氷上走行
性能を改良したものが主流を占めている。
The majority of these studless tires are those with improved running performance on snow and ice due to a unique block structure formed in the tread.

第3図は代表的な従来のスタッドレスタイヤのブロック
パターンを示すトレッドの展開図であり、トレッドTは
中央区域Tcと一対の両側区域Tsからなり、かつ前記
中央区域Tcにはタイヤの周方向に複数の周方向溝1.
1′ 1および両側区域Tsの両端部から前記周方向溝
1.1゛ 1と交差して延びる複数の横溝3によって複
数のブロック2に分割されており、さらに各ブロック2
は負荷転勤時に互に接触する程度の幅を有する複数の切
込みSをタイヤの回転方向と直角に設けられている。
FIG. 3 is a developed view of a tread showing a block pattern of a typical conventional studless tire. Multiple circumferential grooves1.
1' 1 and both ends of both sides Ts are divided into a plurality of blocks 2 by a plurality of lateral grooves 3 extending across the circumferential grooves 1.1' 1, and further each block 2
A plurality of cuts S are provided perpendicularly to the rotational direction of the tire, each having a width such that they come into contact with each other during load transfer.

すなわち、上記従来のスタッドレスタイヤにおいては、
走行時においてタイヤに駆動力或は制動力が作用した場
合に、これら切込みSによるブロックのエツジ効果によ
って、雪上および氷上走行性能の改良が図られており、
その効果も認められている。
That is, in the conventional studless tire mentioned above,
When driving force or braking force is applied to the tire during driving, the edge effect of the block due to these cuts S improves the driving performance on snow and ice.
Its effectiveness has also been recognized.

(発明が解決しようとする課題) しかしながら、上述した従来のスタッドレスタイヤのブ
ロックパターンをトレッド領域がベルト層で補強された
ことにより剛性が高いラジアルタイヤに適用した場合、
とりたてて問題はないがバイアスタイヤに適用した場合
には、特にタイヤの中央区域Tcにおいて、ヒールアン
ドトウ摩耗と称される偏摩耗が発生し、耐摩耗性が低下
するという問題があった。
(Problem to be Solved by the Invention) However, when the block pattern of the conventional studless tire described above is applied to a radial tire whose tread area is reinforced with a belt layer and has high rigidity,
Although there is no particular problem, when applied to a bias tire, uneven wear called heel-and-toe wear occurs, particularly in the central region Tc of the tire, and there is a problem in that the wear resistance is reduced.

これは、バイアスタイヤ特有のトレッドセンター摩耗す
なわちラジアルタイヤに比べ走行時においてトレッド中
央域Tcがタイヤ回転に基く遠心力によって径方向外側
に突出し易いこと及び外力に対し変形が大であることが
原因で両側区域Tsに比して摩耗が早いことが起因し切
込みによって細分化されたブロックに偏摩耗が発生する
This is caused by tread center wear peculiar to bias tires, that is, compared to radial tires, the tread center region Tc tends to protrude outward in the radial direction due to centrifugal force due to tire rotation during driving, and deformation is large in response to external forces. This is due to faster wear than in both side areas Ts, and uneven wear occurs in the blocks that have been subdivided by the cuts.

すなわち、特にトレッドの中央区域Tcにおいては、タ
イヤが接地する際に、段付き摩耗が生じ、ブロックが早
期に凹凸表面を呈する傾向を招くことになり、その結果
特に氷上走行性能が低下すると共に、偏摩耗によってタ
イヤの接地特性および耐久寿命が著しく低下するという
問題があった。
That is, especially in the central region Tc of the tread, stepped wear occurs when the tire makes contact with the ground, leading to a tendency for the blocks to develop an uneven surface at an early stage.As a result, the running performance on ice is particularly deteriorated, and There has been a problem in that uneven wear significantly reduces the tire's ground contact characteristics and durability life.

そこで、本発明の課題は上述した従来のスタッドレス空
気入りタイヤが有する問題点を解決することにある。
Therefore, an object of the present invention is to solve the problems of the conventional studless pneumatic tires described above.

したがって本発明の目的は、雪上および氷上走行性能を
犠牲にすることなしに、偏摩耗、特に比較的硬い路面で
の偏摩耗を改善した空気入りタイヤを提供することにあ
る。
Therefore, an object of the present invention is to provide a pneumatic tire that has improved uneven wear, particularly uneven wear on relatively hard road surfaces, without sacrificing performance on snow and ice.

[発明の構成コ (課題を解決するための手段) すなわち本発明の空気入りタイヤは、一対のサイドウオ
ールと両サイドウオール間にまたがるトレッドがトロイ
ド状に連なり、これら各部分に亙って傾斜コードの複数
プライを互に交差積層して成るバイアスカーカスを備え
、また前記トレッドは軸方向に所定間隔を置いて配置さ
れた少なくとも2本の周方向溝と、一方のトレッド端か
ら前記周方向溝と交差し、トレッドの他端まで実質上連
続して延びる多数の横溝と、前記溝群によって区分され
る多数のブロックを備え、これらブロックの実質上すべ
てが、複数の切込みにより複数のサブブロックに分割さ
れたタイヤにおいて、上記2本の周方向溝に挾まれた中
央区域のブロックの切込みは、上記周方向溝の軸方向外
側に位置する両側区域のブロックの切込みに対比して周
方向に対し傾きが小さいことを特徴とする。
[Configuration of the Invention (Means for Solving the Problems) In other words, the pneumatic tire of the present invention includes a pair of sidewalls and a tread extending between both sidewalls in a toroidal manner, and an inclined cord extending over each part of the tread. The tread includes at least two circumferential grooves disposed at predetermined intervals in the axial direction, and a groove extending from one tread end to the circumferential groove. A plurality of lateral grooves that intersect and extend substantially continuously to the other end of the tread, and a plurality of blocks sectioned by the groove groups, substantially all of which are divided into a plurality of sub-blocks by a plurality of cuts. In the tire, the cut in the block in the central area sandwiched between the two circumferential grooves is inclined with respect to the circumferential direction compared to the cut in the blocks in both side areas located on the axially outer side of the circumferential groove. It is characterized by a small

(作 用) 本発明の空気入りタイヤは、トレッドの中央区域に位置
するブロック内の切込みScと、両側区域に位置するブ
ロック内の切込みSsの、タイヤ周方向に対する傾斜角
度をSc<Ssとなるように構成したため、周方向の前
後におけるヒールアンドトウ摩耗が著しく抑制され、耐
偏摩耗特性が効果的に改善され、ブロック表面全体への
凹凸発生を大11】に減少でき、すぐれた除水性、接地
性およびエツジ効果を得ることができる。
(Function) In the pneumatic tire of the present invention, the inclination angle with respect to the tire circumferential direction of the cut Sc in the block located in the central region of the tread and the cut in the block Ss located in both side regions satisfies Sc<Ss. With this structure, heel-and-toe wear in the front and back circumferential directions is significantly suppressed, the uneven wear resistance is effectively improved, the occurrence of unevenness on the entire block surface can be reduced by 11], and the block has excellent water removal properties. You can obtain ground contact and edge effects.

この結果、切込みによるエツジ効果が理想的に持続して
偏摩耗を生じにくくなり、特に氷上などの硬い路面を旋
回する際の横すべりが解消し、雪上および氷上走行性能
を大巾に向上することができる。
As a result, the edge effect created by the cut lasts ideally, making uneven wear less likely to occur, eliminating side-slips especially when turning on hard surfaces such as ice, and greatly improving driving performance on snow and ice. can.

(実施例) 以下、図面にしたがって本発明の空気入りタイヤの実施
例について、詳細に説明する。
(Example) Hereinafter, examples of the pneumatic tire of the present invention will be described in detail according to the drawings.

第1図は本発明の空気入りタイヤの第1実施例を示すト
レッド部の展開図、第2図は同第2実施例を示すトレッ
ド部の展開図である。
FIG. 1 is a developed view of a tread portion showing a first embodiment of a pneumatic tire of the present invention, and FIG. 2 is a developed view of a tread portion showing a second embodiment of the same.

なお、第1図および第2図においてはトレッド以外の部
分の図示は省略しているが、図示しているl・レッドT
の両端から径方向内側へサイドウオールがそれぞれ延び
、それらの径方向内側端に位置するビードの一方から他
方のビードに亘る部分全体をカーカスで補強する。本発
明において、カーカスは周方向に対し繊維コードを35
°前後の角度で傾斜配列した層の少くとも2枚をコード
が互に交差するように重ね合せて成るいわゆるバイアス
カーカスである。
In addition, in FIGS. 1 and 2, parts other than the tread are not shown, but the l/red T
A sidewall extends radially inward from both ends of the sidewall, and the entire portion extending from one of the beads located at the radially inner end to the other bead is reinforced with the carcass. In the present invention, the carcass has 35 fiber cords in the circumferential direction.
This is a so-called bias carcass, which is made by stacking at least two layers arranged at an angle of about 10° and 30° so that the cords intersect with each other.

第1図に示した第1実施例において、本発明のトレッド
Tは、中央区域Tcと一対の両側区域TSからなり、か
つ前記中央区域Tcには軸方向に間隔を置いて配置され
周方向に延びる一対の周方向溝1.1およびこれらの周
方向溝1.1間の軸方向間隔を実質上三等分し、それら
と平行に延びる中央周方向溝1−により、軸方向にほぼ
等間隔に4分割されている。
In the first embodiment shown in FIG. 1, the tread T of the present invention includes a central region Tc and a pair of both side regions TS, which are arranged at intervals in the axial direction in the central region Tc and in the circumferential direction. The pair of extending circumferential grooves 1.1 and the axial spacing between these circumferential grooves 1.1 are substantially divided into thirds, and the central circumferential groove 1- extending parallel thereto divides the axial spacing between the circumferential grooves 1.1 into approximately equal intervals in the axial direction. It is divided into four parts.

また、一方のトレッド端(両側区域の端部)から前記周
方向溝1.1と交差し、ドレッドの他端(両側区域の端
部)まで連続して延びる多数の横溝3が設けられること
によって、トレッドTは多数のブロック2に区分されて
いる。
Further, by providing a large number of lateral grooves 3 that intersect the circumferential grooves 1.1 from one tread end (ends of both side sections) and extend continuously to the other end of the tread (ends of both side sections). , the tread T is divided into a number of blocks 2.

さらに、各ブロック2のすべては複数の切込みSによっ
て、複数のサブブロックに分割されている。
Furthermore, each block 2 is divided into a plurality of sub-blocks by a plurality of cuts S.

ここで、トレッドTは通常比較的硬質のゴムから形成さ
れるが、場合によってはより軟質のゴムまたは発泡ゴム
をその少なくとも一部に使用することができる。
Here, the tread T is usually formed from relatively hard rubber, but in some cases softer rubber or foamed rubber may be used for at least a portion thereof.

周方向溝1.1および中央周方向溝1′は周方向に平行
な直線状であってもよいが、図示したような折れ線状(
変形フラング状)が望ましく、それらの溝幅および深さ
は溝群の中で最も広くかつ深く形成される。
The circumferential groove 1.1 and the central circumferential groove 1' may have a linear shape parallel to the circumferential direction, but may have a broken line shape (
It is preferable that the grooves have a modified flanged shape, and the width and depth of these grooves are the widest and deepest among the grooves.

横溝3はトレッド端のやや溝幅の広いショルダー横溝3
゛から、センター横溝3へと連通しており、周方向に対
する間隔がほぼ等しくなるように配置されている。
The lateral groove 3 is a shoulder lateral groove 3 with a slightly wider groove width at the end of the tread.
The grooves communicate with the center lateral groove 3, and are arranged so that the intervals in the circumferential direction are approximately equal.

また、横溝3も図示したような折れ線状(変形フラング
状)が望ましく、その折り幅は周方向溝1.1゛ 1よ
りも大きく形成される。
Further, it is desirable that the lateral groove 3 has a bent line shape (deformed flang shape) as shown in the figure, and its fold width is formed to be larger than that of the circumferential groove 1.1.

横溝3の溝幅は周方向溝1.1′ 1と同等であるが、
図示したように溝の流れ途中およびトレッド端近辺にシ
ョルダ一部(3′)としての溝幅拡大部分を設けること
かできる。
The width of the lateral groove 3 is the same as that of the circumferential groove 1.1'1, but
As shown in the figure, a groove width enlarged portion as a shoulder portion (3') can be provided in the middle of the groove and near the tread end.

横溝3の深さは周方向溝1.1′ 1と同等またはそれ
らよりも若干浅めであるが、二つの周方向溝の中央部お
よび/または周方向溝1.1とトレッド端との中央部に
溝底が***した浅い部分を設けることも可能である。
The depth of the lateral groove 3 is the same as or slightly shallower than that of the circumferential groove 1.1'1, but the depth of the lateral groove 3 is the same as that of the circumferential groove 1.1'1, or is slightly shallower than that of the circumferential groove 1. It is also possible to provide a shallow portion with a raised groove bottom.

本発明の空気入りバイアス冬タイヤにおける重要なこと
は、トレッドの中央区域Tcに位置するブロック内の切
込みScと、両側区域Tsに位置するブロック内の切込
みSsの、タイヤ周方向に対する傾斜角度をSc<Ss
となるように構成したことである。
What is important in the pneumatic bias winter tire of the present invention is that the inclination angle Sc with respect to the tire circumferential direction of the notch Sc in the block located in the central region Tc of the tread and the notch Ss in the block located in both side regions Ts is <Ss
It is configured so that.

すなわち、図面ではトレッドの中央区域Tcに位置する
ブロック内の切込みScはタイヤの周方向と実質上平行
であり、両側区域T’sに位置するブロック内の切込み
Ssはタイヤの径方向と実質上平行となっていて、傾斜
角度かをSc<Ssとなる要件が確保されている。
That is, in the drawing, the cut Sc in the block located in the central region Tc of the tread is substantially parallel to the circumferential direction of the tire, and the cut Ss in the block located in both side regions T's is substantially parallel to the radial direction of the tire. They are parallel to each other, and the inclination angle satisfies the requirement that Sc<Ss.

なお、切込みSの傾斜角度は、上記のように図示したS
cとSsが直交した構成が最も望ましいが、第1図の態
様に限定されるものではなく、上記Sc<Ssの条件を
満たす範囲であれば、目的とする効果を得ることができ
る。
Note that the inclination angle of the cut S is the same as S shown above.
A configuration in which c and Ss are orthogonal is most desirable, but the configuration is not limited to the embodiment shown in FIG. 1, and the desired effect can be obtained as long as the above condition of Sc<Ss is satisfied.

切込みの周方向に対する傾斜角につき、たとえば中央区
域Tc、両側区域Tsに夫々周方向に1列ブロック列を
有し、更に両区域の間にもう1列中間区域としてブロッ
ク列を有するようなタイヤの場合、周方向に対する切込
み角度につき両側区域におけるブロックの切込みを最大
、中央区域におけるブロックの切込みを最少、そして中
間区域におけるブロックの切込みの角度を両者の中間に
定めることもできる。
Regarding the inclination angle of the cut with respect to the circumferential direction, for example, a tire having one block row in the circumferential direction in each of the central region Tc and both side regions Ts, and another block row as an intermediate region between both regions. In this case, the cutting angle of the block in the circumferential direction can be set such that the cutting depth of the block in the both side regions is the maximum, the cutting depth of the block in the central region is the minimum, and the cutting angle of the block in the middle region is set between the two.

さらに、各ブロック内の切込みSは、全てを同一の傾斜
角度とする必要はなく、上記Sc<Ssの条件を満たす
範囲であれば、相互に角度を相違させることもできる。
Further, the notches S in each block do not all have to have the same inclination angle, and can have different angles as long as the above condition Sc<Ss is satisfied.

ここで、各ブロックに対し設ける切込みSの本数は任意
に変更可能である。
Here, the number of cuts S provided in each block can be changed arbitrarily.

切込みSの幅は0.3〜1.5關の範囲が好ましく、こ
れらよりブロック全体の剛性を望ましく保つと同時に、
接地性能を改良し、良好なエツジ効果を発揮する。
The width of the cut S is preferably in the range of 0.3 to 1.5 degrees, which allows the rigidity of the entire block to be maintained at a desirable level, and at the same time
Improves ground contact performance and exhibits a good edge effect.

また、切込みSの深さは周方向溝1.1′1の深さの3
0〜90%、特に60〜85%の範囲が好適である。
Also, the depth of the cut S is 3 of the depth of the circumferential groove 1.1'1.
A range of 0 to 90%, particularly 60 to 85% is preferred.

なお、切込みSの深さはすべてを同一とすること以外に
、中央寄りブロックの切込み深さに比し、両側ブロック
の切込み深さを大きくまたは小さくすること、同一ブロ
ック内で軸方向に向かって深く、次に浅くというように
交互に変化を持たせること、および切込みの長手方向の
深さに変化を持たせることなどの態様にすることができ
る。
In addition to making all the depths of cut S the same, it is also possible to make the depth of cut of the blocks on both sides larger or smaller than the depth of cut of the block closer to the center, and to make the depth of cut S of the blocks closer to the center larger or smaller than the depth of cut of the block closer to the center. It is possible to make the cuts alternately deep and then shallow, and to vary the depth in the longitudinal direction of the cuts.

さらに、切込みSは同一ブロック内を貫通している必要
はなく、ブロックの途中や端部で中断していてもよい。
Furthermore, the cut S does not have to penetrate through the same block, and may be interrupted in the middle or at the end of the block.

このように、トレッドの中央区域Tcと両側区域Tsに
おける切込みSc及びSsの傾斜角度を形成することに
より、周方向の前後におけるヒールアンドトウ摩耗によ
るブロック表面の凹凸発生が減少して、偏摩耗を生じに
くくなり、同時に雪上および氷上走行性能を大巾に向上
することができる。
In this way, by forming the inclination angles of the cuts Sc and Ss in the central region Tc and both side regions Ts of the tread, unevenness on the block surface due to heel-and-toe wear in the front and rear circumferential directions is reduced, and uneven wear is prevented. It is less likely that this will occur, and at the same time, driving performance on snow and ice can be greatly improved.

次に、第2図に示した第2実施例は、切込みSをジグザ
グ状に形成した点が上述した第1実施例と相違している
Next, the second embodiment shown in FIG. 2 differs from the first embodiment described above in that the cuts S are formed in a zigzag shape.

このようなジグザグ状の切込みSによっても、上記第1
実施例と同様な効果を得ることができる。
Even with such a zigzag cut S, the first
Effects similar to those of the embodiment can be obtained.

なお、切込みSの形状は、その他にも波状、稲妻状およ
びくの字状などであってもよい。
In addition, the shape of the cut S may be a wave shape, a lightning bolt shape, a dogleg shape, or the like.

次に、試験例により本発明の空気入りタイヤの構成およ
び効果についてさらに詳細に説明する。
Next, the structure and effects of the pneumatic tire of the present invention will be explained in more detail using test examples.

(試験例) タイヤサイズ:LXS7.0O−1612PRLT、使
用リム:5.50F、使用空気圧:6゜0 kg / 
c−のバイアスタイヤのトレッド部に対し、上述の第1
図および第2図に示したブロックパターンを形成し、こ
のタイヤについての評価を行なった。
(Test example) Tire size: LXS7.0O-1612PRLT, Rim used: 5.50F, Air pressure used: 6°0 kg /
For the tread part of the bias tire c-, the above-mentioned first
The block patterns shown in the figures and FIG. 2 were formed, and the tires were evaluated.

すなわち、第1図においてトレッドの幅=155關、周
方向溝1.1の溝幅:8.8mm、深さ:14.6m+
w、中央周方向溝1′の溝幅:5.4+s■、深さ:1
1.7mm、横溝3の溝幅:10關(ショルダー副溝3
″の溝幅:15關)、深さ=14゜611I11として
ブロックパターンを形成した。
That is, in Fig. 1, the width of the tread is 155mm, the width of the circumferential groove 1.1 is 8.8mm, and the depth is 14.6m+.
w, groove width of central circumferential groove 1': 5.4+s■, depth: 1
1.7 mm, groove width of horizontal groove 3: 10 mm (shoulder minor groove 3
A block pattern was formed with a groove width of 15 degrees and a depth of 14 degrees.

また、各ブロック2には、第1図に示した傾斜角度で溝
幅:0.5+sm、深さ:10mmの切込みSCおよび
Ssを設けることにより、本発明タイヤ(A)を製造し
た。
Further, the tire (A) of the present invention was manufactured by providing each block 2 with cuts SC and Ss having a groove width of 0.5+sm and a depth of 10 mm at the inclination angle shown in FIG.

また、切込みSを第2図に示したようなジグザグ状にす
る以外は上記と同様にして、本発明タイヤ(B)を製造
した。
In addition, a tire (B) of the present invention was manufactured in the same manner as above except that the cut S was made in a zigzag shape as shown in FIG.

一方、比較のために、各ブロックに対する切込みSを、
第3図に示し・たようにタイヤの軸方向と平行に3本設
けることにより、従来タイヤを製造した。
On the other hand, for comparison, the cut S for each block is
A conventional tire was manufactured by providing three tires parallel to the axial direction of the tire as shown in FIG.

これら3種類のタイヤについて、下記条件の実車フィー
リングテストにより、氷雪走行性能および偏摩耗の評価
を行なった結果を次表に示す。
These three types of tires were evaluated for ice/snow driving performance and uneven wear through an actual vehicle feeling test under the following conditions, and the results are shown in the table below.

なお、次表はすべて従来タイヤを100とした時の指数
評価で示してあり、指数が大きいほど良好な結果を示す
All of the following tables are shown by index evaluation when the conventional tire is set as 100, and the larger the index, the better the result.

氷雪走行性能 供試車輌:小型トラック、3トン車 路  面:冬期北海道での凍結圧雪路面速   度= 
20〜60 km / h評価方法ニブレーキ性能、登
板性能、総合フィーリング性能 偏摩耗 供試車輌:小型トラック、3トン車 路  面:関東地区、乾燥、湿潤路面 (積雪なし) 速 度: 30〜1 100k/h (高速走行あり) 評価方法: 摩耗外観比較 (ラグ部段差の逆数) 表 (以下本頁余白) 以上の結果から、本発明の空気入りタイヤは、雪上走行
性能および氷上走行性能を高度に維持しつつ偏摩耗特性
を大巾に改善できることが明らかである。
Ice and snow driving performance test vehicle: Small truck, 3-ton vehicle Road surface: Freeze and compacted snow road surface speed in Hokkaido in winter =
20 to 60 km/h Evaluation method Nibraking performance, pitching performance, overall feeling performance Uneven wear Test vehicle: Small truck, 3 ton road Surface: Kanto area, dry, wet road surface (no snow) Speed: 30 to 1 100 km /h (with high-speed running) Evaluation method: Comparison of wear appearance (reciprocal of lug level difference) Table (hereinafter referred to as the margin of this page) From the above results, the pneumatic tire of the present invention has a high level of snow running performance and ice running performance. It is clear that uneven wear characteristics can be greatly improved while maintaining the same.

[発明の効果コ 以上、詳細に説明したように、本発明の空気入りタイヤ
は、トレッドの中央区域に位置するブロック内の切込み
Scと、両側区域に位置するブロック内の切込みSsの
、タイヤ周方向に対する傾斜角度をSc<Ssとなるよ
うに構成したため、周方向の前後におけるヒールアンド
トウ摩耗が著しく抑制され、耐偏摩耗特性が効果的に改
善され、ブロック表面全体への凹凸発生を大111に減
少でき、すぐれた除水性、接地性およびエツジ効果を得
ることができる。
[Effects of the Invention] As explained in detail above, the pneumatic tire of the present invention has a tire circumference of the cut Sc in the block located in the central area of the tread and the cut Ss in the block located in both side areas. Since the inclination angle with respect to the direction is configured so that Sc<Ss, heel-and-toe wear in the front and rear circumferential directions is significantly suppressed, the uneven wear resistance is effectively improved, and the occurrence of unevenness on the entire block surface is greatly reduced. It is possible to obtain excellent water removal properties, ground contact properties, and edge effects.

この結果、切込みによるエツジ効果が理想的に持続して
偏摩耗を生じにくくなり、特に氷上などの硬い路面を旋
回する際の横すべりが解消でき、雪上および氷上走行性
能を大巾に向上することができる。
As a result, the edge effect created by the cutting continues ideally, making uneven wear less likely to occur, eliminating side-slip when turning, especially on hard surfaces such as ice, and greatly improving driving performance on snow and ice. can.

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

第1図は本発明の空気入りバイアス冬タイヤの第1実施
例を示すトレッド部の展開図、第2図は同第2実施例を
示すトレッド部の展開、第3図は従来の空気入りバイア
ス冬タイヤを示すトレッド部の展開図である。 T・・・・・・・・・トレッド Tc・・・・・・中央区域 Ts・・・・・・両側区域 1.1・・・周方向溝 1′・・・・・・中央周方向溝 2・・・・・・・・・ブロック 3・・・・・・・・・横溝 S・・・・・・・・・切込み Sc・・・・・・中央区域の切込み Ss・・・・・・両側区域の切込み 代理人  弁理士  三 好  保 男@3図 T・・・・・・・トレッド Tc・・・・・・中央区域 Ts・・・・両側区域 1.1・・・周方向溝 1″・・・・・中央周方向溝 2・・・・−・・・ブロック 3・・・・・・・・1溝 S・・・・・・・切込み Sc・・・・中央区域の切込み Ss・・・・両側区域の切込み 竹 第2図
Fig. 1 is a developed view of a tread portion showing a first embodiment of a pneumatic bias winter tire of the present invention, Fig. 2 is a developed view of a tread portion showing a second embodiment of the same, and Fig. 3 is a developed view of a conventional pneumatic bias tire. It is a developed view of a tread part showing a winter tire. T...Tread Tc...Central area Ts...Both side areas 1.1...Circumferential groove 1'...Central circumferential groove 2...Block 3...Horizontal groove S...Cut Sc...Central area cut Ss...・Incision agent for both sides areas Patent attorney Yasuo Miyoshi@3 Diagram T・・・・・・Tread Tc・・・Center area Ts・・・Both sides areas 1.1・・・Circumferential groove 1''...Central circumferential groove 2...Block 3...1 groove S...Cut Sc...Cut in central area Ss... Figure 2 of cut bamboo in both sides area

Claims (1)

【特許請求の範囲】[Claims] 一対のサイドウォールと両サイドウォール間にまたがる
トレッドがトロイド状に連なり、これら各部分に亙って
傾斜コードの複数プライを互に交差積層して成るバイア
スカーカスを備え、また前記トレッドは軸方向に所定間
隔を置いて配置された少なくとも2本の周方向溝と、一
方のトレッド端から前記周方向溝と交差し、トレッドの
他端まで実質上連続して延びる多数の横溝と、前記溝群
によって区分される多数のブロックを備え、これらブロ
ックの実質上すべてが、複数の切込みにより複数のサブ
ブロックに分割されたタイヤにおいて、上記2本の周方
向溝に挾まれた中央区域のブロックの切込みは、上記周
方向溝の軸方向外側に位置する両側区域のブロックの切
込みに対比して周方向に対し傾きが小さいことを特徴と
する空気入りバイアス冬タイヤ。
A pair of sidewalls and a tread extending between the sidewalls are arranged in a toroidal manner, each of which is provided with a bias carcass made of multiple plies of slanted cords cross-laminated, and the tread extends in the axial direction. at least two circumferential grooves arranged at predetermined intervals; a large number of lateral grooves that intersect the circumferential grooves from one tread end and extend substantially continuously to the other end of the tread; In a tire comprising a large number of divided blocks, and substantially all of these blocks are divided into a plurality of sub-blocks by a plurality of cuts, the cut of the block in the central area sandwiched between the two circumferential grooves is , a pneumatic bias winter tire characterized in that the inclination in the circumferential direction is smaller than the cut in the blocks in both side areas located on the axially outer side of the circumferential groove.
JP63279290A 1988-11-07 1988-11-07 Pneumatic bias winter tire Pending JPH02127106A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63279290A JPH02127106A (en) 1988-11-07 1988-11-07 Pneumatic bias winter tire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63279290A JPH02127106A (en) 1988-11-07 1988-11-07 Pneumatic bias winter tire

Publications (1)

Publication Number Publication Date
JPH02127106A true JPH02127106A (en) 1990-05-15

Family

ID=17609107

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63279290A Pending JPH02127106A (en) 1988-11-07 1988-11-07 Pneumatic bias winter tire

Country Status (1)

Country Link
JP (1) JPH02127106A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5287905A (en) * 1990-05-14 1994-02-22 Pirelli Coordinamento Pneumatici S.P.A. Tread for a motor vehicle tire

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5287905A (en) * 1990-05-14 1994-02-22 Pirelli Coordinamento Pneumatici S.P.A. Tread for a motor vehicle tire

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