JP3018104B2 - Radial tires for heavy loads - Google Patents

Radial tires for heavy loads

Info

Publication number
JP3018104B2
JP3018104B2 JP2306218A JP30621890A JP3018104B2 JP 3018104 B2 JP3018104 B2 JP 3018104B2 JP 2306218 A JP2306218 A JP 2306218A JP 30621890 A JP30621890 A JP 30621890A JP 3018104 B2 JP3018104 B2 JP 3018104B2
Authority
JP
Japan
Prior art keywords
tire
narrow groove
circumferential direction
groove
stone
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.)
Expired - Fee Related
Application number
JP2306218A
Other languages
Japanese (ja)
Other versions
JPH04183609A (en
Inventor
寛 遠藤
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.)
Yokohama Rubber Co Ltd
Original Assignee
Yokohama Rubber Co Ltd
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 Yokohama Rubber Co Ltd filed Critical Yokohama Rubber Co Ltd
Priority to JP2306218A priority Critical patent/JP3018104B2/en
Publication of JPH04183609A publication Critical patent/JPH04183609A/en
Application granted granted Critical
Publication of JP3018104B2 publication Critical patent/JP3018104B2/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
    • B60C11/0306Patterns comprising block rows or discontinuous ribs
    • B60C11/0309Patterns comprising block rows or discontinuous ribs further characterised by the groove cross-section

Landscapes

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

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、耐轍ワンダリング性を維持させながらタイ
ヤショルダー部の細溝の石噛みを防止する重荷重用ラジ
アルタイヤに関する。
DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a heavy-duty radial tire that prevents rocking of a narrow groove of a tire shoulder portion while maintaining rut wandering resistance.

〔従来の技術〕[Conventional technology]

従来、バスやトラックなどの重荷重用ラジアルタイヤ
の耐轍ワンダリング性を向上させるため、タイヤのショ
ルダー部にタイヤ周方向に沿って細溝を設けたものがあ
る。
BACKGROUND ART Conventionally, in order to improve the wandering resistance of a heavy duty radial tire such as a bus or a truck, a narrow groove is provided in a shoulder portion of the tire along a tire circumferential direction.

しかしながら、このタイヤで砂利路等を走行すると、
上記細溝に石噛みが発生し、溝底面に局部的な応力が与
えられることによって亀裂を生じさせてしまうという問
題がある。
However, when traveling on gravel roads with these tires,
There is a problem that a stone is caught in the narrow groove and a local stress is applied to the groove bottom to cause a crack.

このため、この問題の対策として上記細溝の側壁面の
一方に、多数の突出部をタイヤ周方向に沿って所定のピ
ッチで設けるようにした提案がある。
Therefore, as a countermeasure against this problem, there is a proposal in which a large number of protrusions are provided at a predetermined pitch along one circumferential direction of the tire on one of the side wall surfaces of the narrow groove.

ところがこの提案で突出部が片側の壁面にだけ設けら
れているので、石が噛み込んだとき反対側の壁面の抵抗
が弱くなり、このため石噛みが発生し易くなっている。
したがって、この細溝に一旦入った石等は開口部から押
し出されることなく溝底面にまで入り込み、本質的な解
決策とはならなかった。
However, in this proposal, since the protruding portion is provided only on one wall surface, when the stone is bitten, the resistance of the opposite wall surface is weakened, so that the stone is likely to be bitten.
Therefore, the stone or the like once entering the narrow groove enters the groove bottom without being pushed out from the opening, and is not an essential solution.

また、上述のような石噛みの防止策として細溝の溝幅
を石が噛み込まない程度に極端に狭くしてしまうことが
考えられる。しかし、このようにすると、ショルダー部
を柔軟にして耐轍ワンダリング性を向上するという作用
を相殺してしまうことになる。
In addition, as a measure for preventing the stone from being bitten as described above, it is conceivable that the groove width of the narrow groove is extremely narrowed so that the stone is not bitten. However, in this case, the effect of improving the resistance to rudder wandering by making the shoulder portion flexible is offset.

〔発明が解決しようとする課題〕[Problems to be solved by the invention]

本発明は上述した事情に鑑みなされたものであって、
耐轍ワンダリング性を維持させながらタイヤショルダー
部の細溝の石噛みを防止する重荷重用ラジアルタイヤを
提供することを目的とする。
The present invention has been made in view of the above circumstances,
It is an object of the present invention to provide a heavy-duty radial tire that prevents a narrow groove in a tire shoulder from being caught by a stone while maintaining rut wandering resistance.

〔課題を解決するための手段〕[Means for solving the problem]

本発明は、タイヤ踏面のショルダー端部にタイヤ周方
向に一周に沿う細溝を配置した空気入りタイヤにおい
て、前記細溝のタイヤ幅方向内側の壁面にタイヤ周方向
に沿って多数のカーフを間欠的に設けると共に、前記細
溝の両側壁面に前記カーフを避けながら階段状の突出部
をタイヤ周方向に交互に配置したことを特徴とする。
The present invention relates to a pneumatic tire in which a narrow groove is arranged along the circumference in the tire circumferential direction at the shoulder end of the tire tread, and a number of kerfs are intermittently arranged in the tire circumferential direction on the inner wall surface in the tire width direction of the narrow groove. And stepwise protrusions are alternately arranged in the tire circumferential direction on both side walls of the narrow groove while avoiding the kerf.

このように本発明では、細溝の内側壁面にタイヤ周方
向に沿って多数のカーフを設ける一方で、細溝の両側壁
面に前記カーフを避けながら階段状の突出部を設け、こ
れら突出部をタイヤ周方向に交互に配置したため、片側
の壁面の二つの突出部の間に他側の側壁の突出部が対応
し、平面視でのスリットがジグザグ状を呈したものとな
る。したがって、この細溝の開口部に石等が入り込んで
も、両側壁面に設けた少なくともいずれか一方の突出部
が邪魔をすることによって石等をそのまま開口部へ押し
出してしまう。このようにして、溝底面を亀裂させる確
率は確実に低くなり、しかも耐轍ワンダリング性を低下
させることもない。
As described above, in the present invention, while providing a large number of kerfs on the inner wall surface of the narrow groove along the tire circumferential direction, step-like protrusions are provided on both side wall surfaces of the narrow groove while avoiding the kerf, and these protrusions are formed. Since the protrusions are alternately arranged in the tire circumferential direction, the protrusions on the other side wall correspond between the two protrusions on the wall on one side, and the slit in a plan view has a zigzag shape. Therefore, even if a stone or the like enters the opening of the narrow groove, the stone or the like is pushed out to the opening as it is because at least one of the protruding portions provided on both side wall surfaces hinders. In this way, the probability of cracking the groove bottom surface is reliably reduced, and the rut wandering resistance is not reduced.

以下、図を参照して上記手段につき詳細に説明する。 Hereinafter, the above means will be described in detail with reference to the drawings.

第4図は本発明の重荷重用ラジアルタイヤに設けられ
たトレッドパターンを例示したものである。
FIG. 4 exemplifies a tread pattern provided on the heavy duty radial tire of the present invention.

トレッド踏面にはタイヤ周方向に複数本の主溝5が設
けられ、これら主溝5によって区分されたリブ6が形成
されている。両ショルダー端部には、それぞれタイヤ周
方向に沿って細溝1がもうけられ、この細溝1によって
ショルダー端部に柔軟性が与えられて、高度の耐轍ワン
ダリング性を発揮するようになっている。さらに細溝1
の内側壁側にはタイヤ周方向に沿って多数のカーフ7が
一定ピッチで設けられ、上記耐轍ワンダリング性を一層
向上させるようにしている。
A plurality of main grooves 5 are provided on the tread surface in the tire circumferential direction, and ribs 6 divided by these main grooves 5 are formed. A narrow groove 1 is formed in each of the shoulder ends along the circumferential direction of the tire, and the narrow groove 1 gives flexibility to the shoulder end, thereby exhibiting a high degree of rut wandering resistance. ing. Further narrow groove 1
A large number of kerfs 7 are provided at a constant pitch along the circumferential direction of the tire on the inner wall side of the tire to further improve the rut wandering resistance.

第1図〜第3図は、上述のようにショルダー端部に設
けた細溝1を拡大して示すものである。
FIGS. 1 to 3 are enlarged views of the narrow groove 1 provided at the shoulder end as described above.

これらの図において、細溝1の両側壁2a,2bには階段
状の突出部3がカーフ7を避けながら交互に設けられて
おり、一方の側壁2aに設けられた二つの突出部3が他方
の側壁2bに設けられた一つの突出部3に対して臨む関係
になっている。したがって、石等が細溝1の開口部1aか
ら入り込んでも、少なくともいずれか一方の突出部3の
上面3aがそれ以上の侵入を邪魔し、開口部1aから押し出
してしまう。しかも、突出部3がカーフ7を避けながら
タイヤ周方向に交互になっているので、細溝1の両側壁
2a,2bは溝幅方向に変位自在であり、ショルダー部の柔
軟性を損なうことはない。そのため、細溝1の両側壁2a
に突出部3を設けても、細溝1やカーフ7に基づく耐轍
ワンダリング性を損なうことはない。本発明において、
上述した突出部3の形状と配置は、特に限定されるもの
ではないが、好ましくは本発明による作用効果を一層向
上させるために、第1図と第3図に示すように細溝1と
の関係で次のように形成することが望ましい。
In these figures, step-like projections 3 are alternately provided on both side walls 2a and 2b of the narrow groove 1 while avoiding the kerf 7, and two projections 3 provided on one side wall 2a are connected to the other side. And one projection 3 provided on the side wall 2b. Therefore, even if a stone or the like enters through the opening 1a of the narrow groove 1, the upper surface 3a of at least one of the protrusions 3 hinders further intrusion, and is pushed out from the opening 1a. Moreover, since the protrusions 3 are alternately arranged in the tire circumferential direction while avoiding the kerf 7, both side walls of the narrow groove 1 are formed.
2a and 2b are freely displaceable in the groove width direction, and do not impair the flexibility of the shoulder portion. Therefore, both side walls 2a of the narrow groove 1
Even if the protruding portion 3 is provided, the rudder wandering resistance based on the narrow groove 1 and the kerf 7 is not impaired. In the present invention,
The shape and arrangement of the above-mentioned protrusions 3 are not particularly limited, but preferably, in order to further improve the operation and effect of the present invention, as shown in FIGS. It is desirable to form as follows.

細溝1の幅をW、突出部3の突出方向の長さをwとし
た場合、 W=1.5〜5.0mm、 w/W=0.4〜0.6、 細溝1の深さをD、突出部3の高さをdとした場合、 d/D=0.2〜0.5、 第1図に示すように、タイヤ周方向における突出部3
の長さhを、 h=3〜6mm 溝底面1bにおいて、突出部3の下部とこれの対向する
側壁面との間の曲率半径Rを、 R=1.0〜2.5mm 突出部3のタイヤ回転軸に直交する面に対する外側面
の傾斜角θを、溝底方向へ溝幅を大きくする方向の傾斜
をマイナス(−)とした場合、 θ≧−20゜にすると良い。
If the width of the narrow groove 1 is W and the length of the protrusion 3 in the protruding direction is w, W = 1.5 to 5.0 mm, w / W = 0.4 to 0.6, the depth of the narrow groove 1 is D, and the protrusion 3 Where d is the height of d, d / D = 0.2 to 0.5, as shown in FIG.
In the groove bottom surface 1b, the radius of curvature R between the lower portion of the protrusion 3 and the side wall surface facing the protrusion is R = 1.0 to 2.5mm. When the inclination angle θ of the outer surface with respect to the surface perpendicular to the direction of the groove is minus (−) in the direction of increasing the groove width toward the groove bottom, it is preferable that θ ≧ −20 °.

〔発明の効果〕〔The invention's effect〕

以上説明したように本発明によれば、轍ワンダリング
対策としてタイヤ踏面のショルダー端部に細溝を設けた
空気入りタイヤにおいて、細溝のタイヤ幅方向内側の壁
面にタイヤ周方向に沿って多数のカーフを間欠的に設け
ると共に、細溝の両側壁面にカーフを避けながら階段状
の突出部をタイヤ周方向に交互に配置したため、細溝や
カーフに基づく良好な耐轍ワンダリング性を維持しなが
ら、ショルダー端部の細溝への石噛みを効果的に防止す
ることができる。
As described above, according to the present invention, in a pneumatic tire in which a narrow groove is provided at the shoulder end of the tire tread as a measure against rut wandering, a large number of tire grooves are formed on the inner wall surface in the tire width direction along the tire circumferential direction. The kerfs are provided intermittently, and stair-like protrusions are alternately arranged in the tire circumferential direction while avoiding the kerfs on both side walls of the narrow grooves, so that good rut wandering resistance based on the narrow grooves and kerfs is maintained. However, it is possible to effectively prevent the narrow end groove at the shoulder end from being caught by the stone.

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

第1図は、本発明の一部を示す平面説明図であり、第2
図は第1図における突出部3の斜視図であり、第3図は
第1図におけるA−A断面説明図、第4図は本発明の重
荷重用ラジアルタイヤのトレッドパターンの一例を示す
平面図である。 1……細溝、1a……開口部、1b……溝底部、2a,2b……
側壁面、3……突出部。
FIG. 1 is an explanatory plan view showing a part of the present invention, and FIG.
FIG. 3 is a perspective view of the protruding portion 3 in FIG. 1, FIG. 3 is an explanatory cross-sectional view taken along line AA in FIG. 1, and FIG. 4 is a plan view showing an example of a tread pattern of the heavy duty radial tire of the present invention. It is. 1 ... narrow groove, 1a ... opening, 1b ... groove bottom, 2a, 2b ...
Side wall surface, 3 ... Projection.

───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7,DB名) B60C 11/00 - 11/12 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 7 , DB name) B60C 11/00-11/12

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】タイヤ踏面のショルダー端部にタイヤ周方
向に一周に沿う細溝を配置した空気入りタイヤにおい
て、前記細溝のタイヤ幅方向内側の壁面にタイヤ周方向
に沿って多数のカーフを間欠的に設けると共に、前記細
溝の両側壁面に前記カーフを避けながら階段状の突出部
をタイヤ周方向に交互に配置した重荷重用ラジアルタイ
ヤ。
1. A pneumatic tire having a narrow groove extending along the circumference in the circumferential direction of the tire at the shoulder end of the tread surface of the tire, a large number of kerfs are formed along the circumferential direction of the tire on the inner wall in the width direction of the narrow groove. A radial tire for heavy load, wherein intermittently provided and stair-shaped projections are alternately arranged in the tire circumferential direction while avoiding the kerf on both side walls of the narrow groove.
JP2306218A 1990-11-14 1990-11-14 Radial tires for heavy loads Expired - Fee Related JP3018104B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2306218A JP3018104B2 (en) 1990-11-14 1990-11-14 Radial tires for heavy loads

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2306218A JP3018104B2 (en) 1990-11-14 1990-11-14 Radial tires for heavy loads

Publications (2)

Publication Number Publication Date
JPH04183609A JPH04183609A (en) 1992-06-30
JP3018104B2 true JP3018104B2 (en) 2000-03-13

Family

ID=17954414

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2306218A Expired - Fee Related JP3018104B2 (en) 1990-11-14 1990-11-14 Radial tires for heavy loads

Country Status (1)

Country Link
JP (1) JP3018104B2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6412531B1 (en) * 1999-07-15 2002-07-02 Michelin Recherche Et Technique S.A. Tire tread having groove walls with compound contours
JP5426287B2 (en) * 2009-09-08 2014-02-26 株式会社ブリヂストン Pneumatic tire
JP6186260B2 (en) 2013-12-06 2017-08-23 東洋ゴム工業株式会社 Pneumatic tire

Also Published As

Publication number Publication date
JPH04183609A (en) 1992-06-30

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