JPH05319023A - Pneumatic tire - Google Patents

Pneumatic tire

Info

Publication number
JPH05319023A
JPH05319023A JP4122060A JP12206092A JPH05319023A JP H05319023 A JPH05319023 A JP H05319023A JP 4122060 A JP4122060 A JP 4122060A JP 12206092 A JP12206092 A JP 12206092A JP H05319023 A JPH05319023 A JP H05319023A
Authority
JP
Japan
Prior art keywords
tire
grooves
tread
branch
plane including
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
JP4122060A
Other languages
Japanese (ja)
Other versions
JP3127172B2 (en
Inventor
Yasuo Himuro
泰雄 氷室
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 JP04122060A priority Critical patent/JP3127172B2/en
Publication of JPH05319023A publication Critical patent/JPH05319023A/en
Application granted granted Critical
Publication of JP3127172B2 publication Critical patent/JP3127172B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60CVEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03Tread patterns
    • B60C11/0302Tread patterns directional pattern, i.e. with main rolling direction
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60CVEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03Tread patterns
    • B60C2011/0337Tread patterns characterised by particular design features of the pattern
    • B60C2011/0339Grooves
    • B60C2011/0374Slant grooves, i.e. having an angle of about 5 to 35 degrees to the equatorial plane
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60CVEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C11/00Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/03Tread patterns
    • B60C2011/0337Tread patterns characterised by particular design features of the pattern
    • B60C2011/0339Grooves
    • B60C2011/0381Blind or isolated grooves

Landscapes

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

Abstract

PURPOSE:To use a tire on a snowy or frozen road, by forming branch grooves which branch from oblique grooves of the tread, on the way of the longitudinal course of them to the both sides, and end at the land parts, as the one side branch grooves are parallel or inclined at a slight angle with or to a plane including the center circumferential line of the tire, and the other side branch grooves are parallel or inclined at a slight angle with or to a plane including axis of rotation. CONSTITUTION:Oblique grooves 4a, 4b of a tire are extendedly formed from the tread ends 2a, 2b of the tread part 1 toward the center of the tread part 1, and many lines of the oblique grooves 4a, 4b are formed as the start points are positioned on the outer circumference of the tire at intervals. A plural number of sipes 7 are formed in the land parts 6 partitioned by the oblique grooves 4a, 4b. Moreover, branch grooves 8a, 8b, 9a, 8b which branch from the oblique grooves 4a, 4b, in the longitudinal course of them to the both sides, and end at the land parts 6, are formed as the one side branch grooves 8a, 8b are parallel or inclined at a slight angle with or to a plane including the center circumferential line of the tire, and the other side branch grooves 9a, 9b are parallel or inclined at a slight angle with or to a plane including axis of rotation of the tire.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、全天候で使用でき、特
に積雪や氷結を生じた路面での走行時においても使用可
能な空気入りタイヤに関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic tire which can be used in all weathers and can be used especially when traveling on a road surface having snow or ice.

【0002】[0002]

【従来技術】現在の自動車用空気入りタイヤは、ブレー
キ性能、トラクション性能およびコントロール性能等が
高いことが要求される。そこで、前記の性能を向上させ
るために、タイヤが路面と接地する部位、いわゆるトレ
ッド部のパターンに対する種々の改良が行われている。
代表的なタイヤのトレッドパターンとしては、タイヤの
赤道の両側で対をなし周溝が形成されたリブパターン
と、周溝およびタイヤの軸方向に形成された横溝とでブ
ロック状に区画された陸部を有するブロックパターンと
がある。このブロックパターンのタイヤは、複数のサイ
プを有し、低温の条件下でも軟らかさを有する特性のゴ
ムを用いるのが一般的であった。
2. Description of the Related Art Present pneumatic tires for automobiles are required to have high braking performance, traction performance and control performance. Therefore, in order to improve the performance described above, various improvements have been made to the pattern of the so-called tread portion where the tire contacts the road surface.
A typical tread pattern for a tire is a land pattern that is divided into blocks by a rib pattern that forms a pair of circumferential grooves on both sides of the equator of the tire and a lateral groove that is formed in the circumferential groove and in the axial direction of the tire. There is a block pattern having parts. This block pattern tire generally has a rubber having a plurality of sipes and having a softness even under a low temperature condition.

【0003】[0003]

【発明が解決しようとする課題】前記のリブパターンの
タイヤは、通常の路面においては、横滑りが少なく、操
縦性および安定性に優れている。しかし、積雪や氷結し
た路面においては、エッジ不足、雪柱せん断力不足等に
よりトラクション性能および氷上ブレーキ性能が劣るこ
とから、これらの環境下では使用できない。一方、ブロ
ックパターンのタイヤは、積雪や氷結路面の走行におけ
る操縦安定性には優れているものの、トレッドパターン
をブロックに独立させると、ブロックの剛性不足による
トレッドの早期摩耗や、ウエット時の制動力の不足およ
びコーナリング時の陸部のエッジ効果の不足などの欠点
を抱えていた。またその他として、負荷転動中、同一横
溝の縁における接地がトレッド中央寄りからトレッド端
に向かって移るようにした方向性パターンがある。これ
は、雨天時の路面走行における排水性やコーナリング時
の操縦安定性には優れているが、積雪や氷結路面におけ
るトラクション性能、制動性能および横滑り性能がブロ
ックパターンに比べて劣ることがわかっている。
The tire having the rib pattern described above has little side skid on a normal road surface and is excellent in maneuverability and stability. However, on snowy or icy road surfaces, traction performance and on-ice braking performance are poor due to insufficient edges, insufficient snow column shearing force, etc., and therefore cannot be used in these environments. On the other hand, although the block pattern tire has excellent steering stability in running on snowy roads and icy road surfaces, if the tread pattern is independent of the block, the tread will wear quickly due to insufficient rigidity of the block, and the braking force when wet will occur. It suffered from shortcomings such as lack of edge effect and lack of edge effect in the land during cornering. In addition, there is a directional pattern in which the ground contact at the edge of the same lateral groove shifts from the center of the tread toward the tread end during load rolling. Although this is excellent in drainage performance during road driving in rainy weather and steering stability during cornering, it is known that traction performance, braking performance and skid performance on snowy and iced road surfaces are inferior to the block pattern. ..

【0004】一方、トレッドの材質の改良により性能を
向上させることも考えられるが、この場合も限界があっ
た。 そこで本発明の課題は、トレッドパターンの改良
により前述した課題を解消もしくは低減させることであ
る。
On the other hand, it may be possible to improve the performance by improving the material of the tread, but there was a limit in this case as well. Therefore, an object of the present invention is to solve or reduce the aforementioned problems by improving the tread pattern.

【0005】[0005]

【課題を解決するための手段】本発明は、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部が
トロイド状に連なり、上記トレッド部にその両端から該
トレッド部の中央部に向かって延びる斜め溝の対をタイ
ヤの外周に沿う間隔をおいて多列に配設し、これらの斜
め溝によって区分された陸部に複数のサイプを備えたタ
イヤにおいて、上記トレッドの斜め溝は、その長手方向
の中途から該溝の両側にそれぞれ分岐して陸部に終端を
有する枝溝を備え、かつ枝溝の一方はほぼタイヤの中央
周線を含む平面に対し、また枝溝の他方はほぼタイヤの
回転軸心を含む平面に対しそれぞれ平行またはわずかな
角度をなしていることを特徴とする空気入りタイヤであ
る。
SUMMARY OF THE INVENTION According to the present invention, a pair of sidewalls and a tread portion extending between the sidewalls are connected in a troid shape, and the tread portion extends obliquely from both ends thereof toward a central portion of the tread portion. A pair of grooves are arranged in multiple rows at intervals along the outer circumference of the tire, and in a tire having a plurality of sipes in the land portion divided by these diagonal grooves, the diagonal groove of the tread has its longitudinal direction. A branch groove that branches from the middle of the groove to each side of the groove and terminates in the land portion is provided, and one of the branch grooves is substantially with respect to a plane including the central circumferential line of the tire, and the other of the branch grooves is substantially the rotation of the tire. The pneumatic tire is characterized in that it is parallel or at a slight angle to a plane including the axis.

【0006】以下に本発明の説明を図面に基づいて行
う。なおタイヤの内部構造については図示を省略した
が、それは一般的なラジアルタイヤのものと同様だから
である。図1は本発明のトレッド部1の展開図である。
このトレッドパターンは、トレッド部1の両側のトレッ
ド端2a,2bからトレッド部1の中央部に向かって延
びる斜め溝4a,4bの対を、タイヤの外周に沿う間隔
を置いて多列に配設して成るものである。この斜め溝4
a,4bは、トレッド端2a,2bからトレッド部の中
央周線3の方へ収斂し、矢印5で示したタイヤの回転に
よってトレッド部1の中央部から両側への排水を強いる
主溝の性格を有する。斜め溝4a,4bは、中央周線3
を含む平面に対し鋭角をなす角度がトレッド部1の中央
部と両トレッド端2a,2b寄りとで同じであるか、ま
たは中央部に比し両トレッド端2a,2b寄りで大きく
し、その角度は左右同じにしてもしなくてもよい。な
お、斜め溝4a,4bがトレッド部1の中央周線3をわ
ずかに越えてそれぞれ互い違いに延びてT字状に交差す
る場合について図1に示したが、交差する配列であって
も交差しない配列であってもよい。さらにトレッド部1
の中央において対称(点対称または線対称)になってい
るが、そうでなくてもよい。
The present invention will be described below with reference to the drawings. Although illustration of the internal structure of the tire is omitted, it is because it is similar to that of a general radial tire. FIG. 1 is a development view of a tread portion 1 of the present invention.
In this tread pattern, pairs of diagonal grooves 4a and 4b extending from the tread ends 2a and 2b on both sides of the tread portion 1 toward the central portion of the tread portion 1 are arranged in multiple rows at intervals along the outer circumference of the tire. It consists of This diagonal groove 4
Characters a and 4b of the main groove which converge from the tread ends 2a and 2b toward the center circumferential line 3 of the tread portion and force the drainage from the center portion of the tread portion 1 to both sides by the rotation of the tire indicated by the arrow 5. Have. The diagonal grooves 4a and 4b are formed on the central circumference line 3.
The angle forming an acute angle with respect to the plane including is the same in the central part of the tread portion 1 and both tread ends 2a, 2b, or is larger at both tread ends 2a, 2b than the central part, and its angle May or may not be the same on the left and right. Although the oblique grooves 4a and 4b cross each other slightly beyond the central circumferential line 3 of the tread portion 1 and alternately intersect each other in a T-shape, they are shown in FIG. It may be an array. Further tread part 1
It is symmetric (point symmetry or line symmetry) in the center of, but it need not be.

【0007】斜め溝4a,4bは、タイヤの外周に沿う
間隔をおいて多列をなしているが、前記の間隔で隣接す
る二つの斜め溝の間にそれぞれ弓形の陸部6を形成す
る。該陸部6では、タイヤの接地部がトレッド部1の中
央部から端部へ移るよう配慮されている。この各陸部6
には、ブロック剛性を均一に維持するために、タイヤの
回転軸心にほぼ平行もしくは垂直なサイプ7が設けてあ
る。斜め溝4a,4bの両側にそれぞれ分岐して陸部6
に終端を有する枝溝8aと9a,8bと9bは、それぞ
れ対をなし、タイヤの中央周線3を含む平面に対し平行
またはわずかな角度をなしている枝溝8a、8bと、タ
イヤの回転軸心を含む平面に対し平行またはわずかな角
度をなしている枝溝9a,9bとに分かれる。なお、前
記で言うわずかな角度とは、それぞれ±15°の範囲の
角度のことを意味する。図1に示す実施例では、枝溝8
a,8bは中央周線3を含む平面と平行、また枝溝9
a,9bは回転軸心を含む平面と平行、すなわち角度0
°の場合をそれぞれ示している。
The diagonal grooves 4a and 4b are arranged in multiple rows at intervals along the outer circumference of the tire, and the arc-shaped land portions 6 are formed between the two adjacent diagonal grooves at the above intervals. In the land portion 6, it is considered that the ground contact portion of the tire moves from the central portion of the tread portion 1 to the end portion. Each land 6
In order to maintain the block rigidity uniform, the sipe 7 is provided substantially parallel or perpendicular to the axis of rotation of the tire. Land on both sides of diagonal grooves 4a and 4b
The branch grooves 8a and 9a, 8b and 9b having ends at the pair are respectively paired with each other, and the branch grooves 8a and 8b are parallel or at a slight angle with respect to the plane including the center line 3 of the tire and the rotation of the tire. It is divided into branch grooves 9a and 9b which are parallel to the plane including the axis or form a slight angle. The slight angles referred to above mean angles within a range of ± 15 °. In the embodiment shown in FIG. 1, the branch groove 8
a and 8b are parallel to the plane including the central peripheral line 3, and the branch groove 9
a and 9b are parallel to a plane including the rotation axis, that is, an angle of 0
Each case is shown in °.

【0008】この枝溝8a,8b,9a,9bは、エッ
ジ効果の点では複数設けたほうがよいが、ブロックの剛
性を維持することを考慮すると、各斜め溝4a,4bで
1〜3対程度が好ましい。また、ブロック剛性を維持す
るために、枝溝のいずれか一方の端は他のいずれの溝と
も開口しないことが好ましい。枝溝長さは、ブロック全
体の剛性を確保しエッジ効果を十分発揮できるようにす
るため、陸部幅の60〜90%とする。なお、陸部幅
は、各枝溝の開口部から、開口していない先端を真っす
ぐ延長し他の溝と交わったところまでの長さであると、
便宜上、定義する。
It is better to provide a plurality of branch grooves 8a, 8b, 9a, 9b in terms of the edge effect, but in consideration of maintaining the rigidity of the block, each diagonal groove 4a, 4b has about 1 to 3 pairs. Is preferred. Further, in order to maintain the block rigidity, it is preferable that one end of the branch groove does not open to any other groove. The branch groove length is set to 60 to 90% of the land width in order to secure the rigidity of the entire block and to sufficiently exert the edge effect. In addition, the land width is the length from the opening of each branch groove to the point where the tip that is not open extends straight and intersects with other grooves,
Defined for convenience.

【0009】[0009]

【作用】この空気入りタイヤでは、矢印5の方向に負荷
転動した時に、トレッド部の斜め溝4a,4bと陸部6
とが、トレッド部1の中央部から端部へ移るように成っ
ていることから、雨天走行時の排水性およびコーナリン
グでの操縦安定性を向上することができる。また、陸部
6に複数のサイプ7を設けることにより、トレッド部1
の材質に軟らかいゴムを用いた場合でも、トレッド部1
は、ブロック剛性を均一に維持することができ、積雪や
氷結した路面においても安定した性能を維持することが
できる。さらに、トレッド部1に、前記の枝溝8a,8
b,9a,9bを設けることにより、駆動および制動の
際における前後の力や横滑りの力を受けた場合でも、そ
のエッジ効果により安全走行ができる。
In this pneumatic tire, when the load is rolled in the direction of arrow 5, the oblique grooves 4a and 4b of the tread portion and the land portion 6 are
And so as to move from the central portion to the end portion of the tread portion 1, it is possible to improve the drainage property during traveling in rainy weather and the steering stability in cornering. Further, by providing a plurality of sipes 7 on the land portion 6, the tread portion 1
Even if soft rubber is used as the material of the
The block rigidity can be kept uniform, and stable performance can be maintained even on snowy or icy road surfaces. Further, in the tread portion 1, the branch grooves 8a, 8
By providing b, 9a, and 9b, even when a front-back force or a skid force during driving and braking is applied, the edge effect thereof enables safe traveling.

【0010】[0010]

【実施例】以下に本発明タイヤと従来タイヤとの比較試
験を行ったので説明する。 ◎供試タイヤ ・発明タイヤ1 このタイヤは、図1に示すトレッドパターンを有し、そ
のサイズがPSR185/70R13、トレッド幅が1
52mmである。またトレッド部の斜め溝は、その溝幅
をトレッド中央部で5mm、トレッド端付近で10m
m、これらの中間で7mmとし、矢印5に示したタイヤ
の回転に対し、トレッド端付近でほぼ90°とし、トレ
ッド端側の枝溝付近における角度と中央域付近における
角度をそれぞれ55°と35°になるようにする。対を
なす枝溝は、一方がタイヤの中央周線3を含む平面に対
して、他方がタイヤの回転軸心を含む平面に対してそれ
ぞれ平行であり、枝溝長さはそれぞれ陸部幅の70%と
65%である。またサイプ7の切り込みすき間幅は、
0.7mmである。 ・発明タイヤ2 このタイヤは、図2に示すトレッドパターンであり、負
荷転動時において、最初にタイヤの接地面内に入るの
は、タイヤの回転軸心を含む平面に対し平行である枝溝
9a,9bであり、次いで、タイヤの中央周線3を含む
平面に対し平行である枝溝8a、8bであることが発明
タイヤ1との相違点であり、その他は同じ構造のタイヤ
である。 ・発明タイヤ3 このタイヤは、図3に示すトレッドパターンであり、対
をなす枝溝のそれぞれが、斜め溝に対して鋭角側で10
°だけ発明タイヤ2よりも広がっている他は発明タイヤ
2と同じ構造のタイヤである。 ・従来タイヤ トレッドパターンが図4に示すブロックパターンであ
り、その他の構造は発明タイヤと同じである。
EXAMPLES A comparative test of the tire of the present invention and a conventional tire will be described below. ◎ Test tire ・ Invention tire 1 This tire has the tread pattern shown in Fig. 1, the size is PSR185 / 70R13, and the tread width is 1.
It is 52 mm. The diagonal groove of the tread has a groove width of 5 mm at the center of the tread and 10 m near the end of the tread.
m, in the middle of them, 7 mm, about 90 ° with respect to the rotation of the tire shown by the arrow 5 near the tread end, and the angle near the tread end side branch groove and the angle near the central region are 55 ° and 35, respectively. To be One pair of the branch grooves is parallel to a plane including the tire central circumferential line 3 and the other is parallel to a plane including the tire rotation axis, and the branch groove lengths are each equal to the land portion width. 70% and 65%. In addition, the notch clearance width of sipe 7 is
It is 0.7 mm. Inventive tire 2 This tire has a tread pattern shown in FIG. 2. When rolling under load, the first thing that enters the ground contact surface of the tire is a branch groove that is parallel to the plane including the rotation axis of the tire. 9a and 9b, and branch grooves 8a and 8b that are parallel to the plane including the tire central circumferential line 3 are different from the tire 1 of the invention, and the other tires have the same structure. Inventive Tire 3 This tire has the tread pattern shown in FIG. 3, and each pair of branch grooves has an acute angle side of 10 with respect to the oblique groove.
The tire has the same structure as the invention tire 2 except that it is wider than the invention tire 2 by °. The conventional tire tread pattern is the block pattern shown in FIG. 4, and the other structures are the same as those of the invention tire.

【0011】◎試験方法 内圧1.8kgf/cm2 、実車で2名が乗車したのと
同様な荷重を付加した条件下で上記の各タイヤを使用
し、雪上フィーリング試験、氷上ブレーキ試験、ウエッ
トブレーキ試験およびタイヤ摩耗試験を行った。雪上フ
ィーリング試験は、圧雪状態の路面でのハンドリング、
発進、加速および制動の総合フィーリング評価試験であ
る。氷上ブレーキ試験は、氷盤上における時速40km
/hの制動距離の計測による試験である。ウエットブレ
ーキ試験は、水深2mm、時速80km/hの制動距離
の計測による試験である。タイヤ摩耗試験は、5000
kmの通常走行後の残溝深さの計測による試験である。
表1にこれらの試験結果を示す。なお、表1中の数値
は、従来タイヤの性能を100としており、この数値は
いずれの試験でも大きいほうが性能が優れていることを
示している。
◎ Test method Using the above tires under an internal pressure of 1.8 kgf / cm 2 and under the same load as two passengers in an actual vehicle, a snow feeling test, an ice brake test, a wet test A brake test and a tire wear test were conducted. Feeling test on snow, handling on the road surface of the snow,
This is a comprehensive feeling evaluation test for starting, acceleration and braking. Brake test on ice is 40 km / h on ice
It is a test by measuring a braking distance of / h. The wet brake test is a test in which the water depth is 2 mm and the braking distance is 80 km / h. Tire wear test is 5000
It is a test by measuring the depth of the residual groove after a normal running of km.
Table 1 shows the results of these tests. The numerical values in Table 1 are based on the conventional tire performance of 100, and the larger the numerical value in any test, the better the performance.

【0012】[0012]

【表1】 これらの試験結果を総合的に評価すると、発明タイヤは
いずれも従来タイヤに比べて優れているのがわかる。特
に、いずれの発明タイヤも、雪上フィーリング性能を低
下させることなく、ウエットブレーキ性能とタイヤ摩耗
の度合いが従来タイヤよりも勝っている。また、発明タ
イヤ1と発明タイヤ2は、いずれの試験結果も従来タイ
ヤに対して同等以上の性能を示すことがわかった。
[Table 1] Comprehensive evaluation of these test results shows that the invention tires are all superior to the conventional tires. In particular, each of the invention tires is superior to the conventional tire in wet brake performance and tire wear level without deteriorating the feeling on snow. In addition, it was found that the test results of the invention tire 1 and the invention tire 2 are equal to or higher than the performance of the conventional tire in both test results.

【0013】[0013]

【発明の効果】この発明によれば、上記比較試験結果か
らも明らかなように、通常の路面のみならず、積雪や氷
結した路面でも優れた運動性能を発揮することができ
る。
According to the present invention, as is clear from the results of the comparative test, excellent exercise performance can be exhibited not only on a normal road surface but also on a snowy or frozen road surface.

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

【図1】図1は、本発明による発明タイヤ1のトレッド
展開図である。
FIG. 1 is a development view of a tread of an inventive tire 1 according to the present invention.

【図2】図2は、本発明による発明タイヤ2のトレッド
展開図である。
FIG. 2 is a tread development view of an inventive tire 2 according to the present invention.

【図3】図3は、本発明による発明タイヤ3のトレッド
展開図である。
FIG. 3 is a tread development view of an inventive tire 3 according to the present invention.

【図4】図4は、従来タイヤのトレッド展開図である。FIG. 4 is a development view of a tread of a conventional tire.

【符号の説明】[Explanation of symbols]

1 トレッド部 2a, 2b トレッド端 3 中央周線 4a, 4b 斜め溝 5 矢印 6 陸部 7 サイプ 8a, 8b ほぼタイヤの中央周線を含む平面に対し平行ま
たはわずかな角度をなしている枝溝 9a,9b ほぼタイヤの回転軸心を含む平面に対し平行また
はわずかな角度をなしている枝溝
1 Tread part 2a, 2b Tread edge 3 Center circumference line 4a, 4b Diagonal groove 5 Arrow 6 Land part 7 Sipe 8a, 8b Branch groove 9a that is almost parallel or at a slight angle to the plane including the center circumference of the tire , 9b Branch grooves that are parallel or at a slight angle to the plane containing the tire's axis of rotation

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】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部がトロイド状に連なり、上記ト
レッド部にその両端から該トレッド部の中央部に向かっ
て延びる斜め溝の対をタイヤの外周に沿う間隔をおいて
多列に配設し、これらの斜め溝によって区分された陸部
に複数のサイプを備えたタイヤにおいて、上記トレッド
の斜め溝は、その長手方向の中途から該溝の両側にそれ
ぞれ分岐して陸部に終端を有する枝溝を備え、かつ枝溝
の一方はほぼタイヤの中央周線を含む平面に対し、また
枝溝の他方はほぼタイヤの回転軸心を含む平面に対しそ
れぞれ平行またはわずかな角度をなしていることを特徴
とする空気入りタイヤ。
1. A pair of sidewalls and a tread portion extending between the sidewalls are connected in a troid shape, and a pair of diagonal grooves extending from both ends of the tread portion toward the center of the tread portion is provided on the outer circumference of the tire. In a tire provided with a plurality of sipes in a land portion divided by these diagonal grooves, which are arranged in multiple rows at intervals along the diagonal groove of the tread, from the middle of its longitudinal direction to both sides of the groove. Each of the branch grooves has a branch groove which is branched and has an end in the land portion, and one of the branch grooves is substantially in the plane including the center line of the tire, and the other of the branch grooves is approximately in the plane including the rotation axis of the tire. Pneumatic tire characterized by being parallel or at a slight angle.
JP04122060A 1992-05-14 1992-05-14 Pneumatic tire Expired - Fee Related JP3127172B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP04122060A JP3127172B2 (en) 1992-05-14 1992-05-14 Pneumatic tire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP04122060A JP3127172B2 (en) 1992-05-14 1992-05-14 Pneumatic tire

Publications (2)

Publication Number Publication Date
JPH05319023A true JPH05319023A (en) 1993-12-03
JP3127172B2 JP3127172B2 (en) 2001-01-22

Family

ID=14826633

Family Applications (1)

Application Number Title Priority Date Filing Date
JP04122060A Expired - Fee Related JP3127172B2 (en) 1992-05-14 1992-05-14 Pneumatic tire

Country Status (1)

Country Link
JP (1) JP3127172B2 (en)

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