JP4198199B2 - Heavy duty pneumatic tire - Google Patents
Heavy duty pneumatic tire Download PDFInfo
- Publication number
- JP4198199B2 JP4198199B2 JP29310695A JP29310695A JP4198199B2 JP 4198199 B2 JP4198199 B2 JP 4198199B2 JP 29310695 A JP29310695 A JP 29310695A JP 29310695 A JP29310695 A JP 29310695A JP 4198199 B2 JP4198199 B2 JP 4198199B2
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- JP
- Japan
- Prior art keywords
- groove
- circumferential
- pneumatic tire
- heavy duty
- duty pneumatic
- 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 - Lifetime
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Description
【0001】
【発明が属する技術分野】
重荷重用空気入りタイヤのトレッドパターンに関するもので、特には石咬み防止に関するものである。
【0002】
【従来の技術】
重荷重用空気入りタイヤ、特に悪路を走行するタイヤにおいて溝に石を咬むことにより、タイヤを損傷したり、一度咬んだ石が走行中に外れることで周囲の車両等に危険を及ぼすということがあった。従来、石咬み性を改良するためには、溝が延びる方向に直角方向の断面におけるトレッド表面に立てた法線に対する溝側壁の角度を大きく取ることや、所謂ストーン・イジェクターを溝の中に設置することが一般的に行われていた。
【0003】
【発明が解決しようとする課題】
しかしながら、上記のように溝側壁の角度を単純に大きくすると、溝底のRが小さくなるため、走行によるゴムの劣化にともない、溝底からのゴムの亀裂を生じるという問題点や、周方向主溝とそれに横方向溝が繋がる箇所で石を咬みやすいという問題点に対する改良はなされていなかった。また、ストーン・イジェクターにおいては、タイヤのウエット性能を低下させるという問題を解決することができないのが現状である。
【0004】
そこで本発明の目的は、耐久性やウェット性能を低下することなしに効果的に石咬みを防止した重荷重用空気入りタイヤを提案することにある。
【0005】
【課題を解決するための手段】
上記の目的を達成するために、本発明の重荷重用空気入りタイヤは、少なくとも2本の周方向溝と、周方向溝に繋がり、周方向に間隔をおいて配置された多数の横方向溝とをトレッドに具えた重荷重用空気入りタイヤにおいて、該周方向溝を形成する左右一対の溝側壁のうち、一方の溝側壁が該横方向溝に繋がる箇所のみに、他方の溝側壁に石咬みを防止する切欠を形成し、該石咬みを防止する切欠は、該周方向溝が延びる方向に直角方向の断面におけるトレッド表面に立てた法線に対する該周方向の溝側壁の角度より大きい側壁角度を有している。
【0006】
また、切欠の側壁角度が、周方向溝が延びる方向に直角方向の断面におけるトレッド表面に立てた法線に対する周方向の溝側壁の角度より大きいと石咬みは、さらに少なくなるので好ましい。
【0007】
2本の周方向主溝とこの周方向主溝に繋がり、周方向に間隔をおいて配置された多数の横方向とを具えた重荷重用空気入りタイヤにおいては、最も石咬みが問題となるのは横方向溝が周方向溝に繋がる箇所である図3のS部となる。この部分は、ブロック端が集まる箇所でありこの周囲の剛性が低下するために石が咬みやすくなるわけである。この場合、本発明の採用している構成のように横方向溝が周方向溝に繋がる箇所の、周方向溝の溝側壁に切欠を形成すると、この部分の空間が大きくなり石咬みが発生しにくくなるわけである。さらに、切欠の側壁角度を、周方向溝が延びる方向に直角方向の断面におけるトレッド表面に立てた法線に対する周方向溝の溝側壁の角度より大きくすれば切欠部に石か咬みにくくなり改良効果か大きい。また、切欠部を設けることによりウェット性能も向上する。
【0008】
【発明の実施の形態】
本発明に従う実施の形態について図面を参照して説明すると、図1は本発明に従う実施例のトラック及びバス用空気入りタイヤのトレッドパターンの一部拡大正面図であって、タイヤサイズは10.00R20である。
実施例の空気入りタイヤのトレッドには、図示のように、4本の周方向溝1、2が設けられ、さらに周上に間隔をおいて配置された多数の横方向溝3、4、5を具えていて、これらの周方向溝1、2及び横方向溝3、4、5よって多数のブロック10、11、12がトレッド周上に間隔をおいて形成されている。そして、横方向溝が周方向溝に繋がる箇所の、周方向溝の溝側壁に切欠6、7、8、9を設けているのを特徴としている。
【0009】
本発明の効果を確かめるべく表1に示す仕様に基づいて切欠6、7、8を設けたタイヤを試作した。また、比較として図3に示す切欠の設けていないタイヤを切欠以外の部分は、まったく同一構造として試作した。これらのタイヤを7.50Vのリムに内圧9.0kg/cm2 組みつけ10トン・ダンプカーのリアーに装着して、速度40〜60km/hで石の多い現場を5,000km走行し、タイヤ一本内での横方向溝が周方向溝に繋がる箇所の石の数を比較したのを同じく表1に示してある。
【0010】
【表1】
【0011】
上記から明らかなように、切欠を設けた実施例1のタイヤは、比較例に対し石咬みを大幅に改良しており、さらに切欠の側壁の角度を大きくした実施例2では石咬みが見られなかった。
【0012】
【発明の効果】
以上に述べたところから明らかなように、本初明によれば、重荷重用空気入りタイヤの石咬みを大幅に減少することができる。
【図面の簡単な説明】
【図1】本発明による重荷重用空気入りタイヤのトレッドパターン一部拡大正面囲である。
【図2】図1における重荷重用空気入りタイヤの溝断面図である。
【図3】従来の切欠のない重荷重用空気入りタイヤのトレッドパターン一部拡大正面図である。
【符号の説明】
1、2 周方向溝
3、4、5 横方向溝
6、7、8、9 切欠
10、11、12 ブロック
N トレッド法線
E タイヤ赤道線(トレッドパターン・センター)[0001]
[Technical field to which the invention belongs]
The present invention relates to a tread pattern of a heavy duty pneumatic tire, and particularly relates to prevention of stone bite.
[0002]
[Prior art]
Heavy duty pneumatic tires, especially tires traveling on rough roads, may damage the tires by biting stones in the grooves, or may cause danger to surrounding vehicles etc. if the stones once bited off during driving was there. Conventionally, in order to improve the biteability of the stone, the angle of the groove side wall with respect to the normal line standing on the tread surface in the cross section perpendicular to the direction in which the groove extends is increased, or a so-called stone ejector is installed in the groove. It was generally done.
[0003]
[Problems to be solved by the invention]
However, if the groove sidewall angle is simply increased as described above, the groove bottom R decreases, so that the rubber is cracked from the groove bottom due to deterioration of the rubber due to running, and the circumferential main No improvement has been made to the problem that it is easy to bite stones at the point where the groove and the lateral groove are connected. In addition, the present situation is that stone ejectors cannot solve the problem of reducing the wet performance of a tire.
[0004]
Therefore, an object of the present invention is to propose a heavy duty pneumatic tire that effectively prevents stone biting without deteriorating durability and wet performance.
[0005]
[Means for Solving the Problems]
To achieve the above object, the heavy-duty pneumatic tire of the present invention comprises at least two circumferential grooves and a plurality of lateral grooves that are connected to the circumferential grooves and spaced apart in the circumferential direction. In a heavy duty pneumatic tire having a tread, a stone bite is placed on the other groove side wall only at a position where one groove side wall is connected to the lateral groove of the pair of left and right groove side walls forming the circumferential groove. The notch that prevents the stone bite has a sidewall angle that is greater than the angle of the circumferential groove sidewall with respect to the normal to the tread surface in a cross section perpendicular to the direction in which the circumferential groove extends. Have.
[0006]
Further, it is preferable that the side wall angle of the notch is larger than the angle of the circumferential groove side wall with respect to the normal standing on the tread surface in the cross section perpendicular to the direction in which the circumferential groove extends, because the stone bite is further reduced.
[0007]
In heavy duty pneumatic tires having two circumferential main grooves and a large number of lateral directions connected to the circumferential main grooves and spaced apart in the circumferential direction, stone biting is the most problematic. Is the S portion of FIG. 3 where the lateral grooves are connected to the circumferential grooves. This part is a place where the block ends gather, and the rigidity around this block is lowered, so that the stone is easy to bite. In this case, if a notch is formed in the groove side wall of the circumferential groove where the lateral groove is connected to the circumferential groove as in the configuration adopted by the present invention, the space in this part becomes large and stone biting occurs. It becomes difficult. In addition, if the side wall angle of the notch is made larger than the angle of the groove side wall of the circumferential groove with respect to the normal standing on the tread surface in the cross section perpendicular to the direction in which the circumferential groove extends, it becomes difficult to bite the stone into the notch. Or big. Moreover, wet performance is also improved by providing a notch.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment according to the present invention will be described with reference to the drawings. FIG. 1 is a partially enlarged front view of a tread pattern of a pneumatic tire for trucks and buses according to an embodiment of the present invention, and the tire size is 10.00R20. It is.
As shown in the figure, the tread of the pneumatic tire of the embodiment is provided with four
[0009]
In order to confirm the effect of the present invention, tires with
[0010]
[Table 1]
[0011]
As is clear from the above, the tire of Example 1 provided with the notch has greatly improved the stone bite relative to the comparative example, and in Example 2 in which the angle of the side wall of the notch is further increased, the stone bite is seen. There wasn't.
[0012]
【The invention's effect】
As is apparent from the above description, according to the present initial description, the stone biting of the heavy duty pneumatic tire can be greatly reduced.
[Brief description of the drawings]
FIG. 1 is a partially enlarged front view of a tread pattern of a heavy duty pneumatic tire according to the present invention.
2 is a groove cross-sectional view of a heavy duty pneumatic tire in Fig.
FIG. 3 is a partially enlarged front view of a tread pattern of a conventional heavy duty pneumatic tire without a notch.
[Explanation of symbols]
1, 2,
Claims (1)
該周方向溝を形成する左右一対の溝側壁のうち、一方の溝側壁が該横方向溝に繋がる箇所のみに、他方の溝側壁に石咬みを防止する切欠を形成し、
該石咬みを防止する切欠は、該周方向溝が延びる方向に直角方向の断面におけるトレッド表面に立てた法線に対する該周方向の溝側壁の角度より大きい側壁角度を有する、ことを特徴とする重荷重用空気入りタイヤ。In a heavy duty pneumatic tire comprising at least two circumferential grooves and a plurality of lateral grooves connected to the circumferential grooves and arranged at intervals in the circumferential direction in a tread,
Of the pair of left and right groove sidewalls that form the circumferential groove, only one portion of the groove sidewall is connected to the lateral groove , and the other groove sidewall is formed with a notch that prevents stone biting ,
The notch for preventing stone biting has a sidewall angle larger than an angle of the circumferential groove sidewall with respect to a normal line standing on a tread surface in a cross section perpendicular to a direction in which the circumferential groove extends. Heavy duty pneumatic tire.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP29310695A JP4198199B2 (en) | 1995-11-10 | 1995-11-10 | Heavy duty pneumatic tire |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP29310695A JP4198199B2 (en) | 1995-11-10 | 1995-11-10 | Heavy duty pneumatic tire |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH09132010A JPH09132010A (en) | 1997-05-20 |
JP4198199B2 true JP4198199B2 (en) | 2008-12-17 |
Family
ID=17790513
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP29310695A Expired - Lifetime JP4198199B2 (en) | 1995-11-10 | 1995-11-10 | Heavy duty pneumatic tire |
Country Status (1)
Country | Link |
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JP (1) | JP4198199B2 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH1142911A (en) * | 1997-07-30 | 1999-02-16 | Bridgestone Corp | Heavy load pneumatic tire |
JP5513406B2 (en) | 2007-12-21 | 2014-06-04 | コンパニー ゼネラール デ エタブリッスマン ミシュラン | Mechanism for removing objects from the tire tread |
JP5964009B2 (en) * | 2010-07-16 | 2016-08-03 | 横浜ゴム株式会社 | Pneumatic tire |
JP5734669B2 (en) * | 2011-01-07 | 2015-06-17 | 株式会社ブリヂストン | Pneumatic tire |
CN104129235B (en) * | 2014-08-26 | 2017-01-18 | 正新橡胶(中国)有限公司 | Tyre surface |
US10232669B2 (en) * | 2014-11-27 | 2019-03-19 | Sumitomo Rubber Industries, Ltd. | Heavy duty pneumatic tire |
JP6907541B2 (en) * | 2017-01-11 | 2021-07-21 | 横浜ゴム株式会社 | Pneumatic tires |
JP6493421B2 (en) * | 2017-01-17 | 2019-04-03 | 横浜ゴム株式会社 | Pneumatic tire |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5918002A (en) * | 1982-07-21 | 1984-01-30 | Bridgestone Corp | Pneumatic tyre for heavy load |
JPH01204805A (en) * | 1988-02-12 | 1989-08-17 | Bridgestone Corp | Pneumatic tire |
JPH0299409A (en) * | 1988-10-06 | 1990-04-11 | Yokohama Rubber Co Ltd:The | Pneumatic tire |
DE4138687C2 (en) * | 1991-11-25 | 1995-09-14 | Pirelli Reifenwerke | Tread pattern for a vehicle tire |
JPH06312603A (en) * | 1993-04-28 | 1994-11-08 | Toyo Tire & Rubber Co Ltd | Radial tire for heavy load |
-
1995
- 1995-11-10 JP JP29310695A patent/JP4198199B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH09132010A (en) | 1997-05-20 |
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