JPS624608A - Pneumatic tire - Google Patents
Pneumatic tireInfo
- Publication number
- JPS624608A JPS624608A JP60140589A JP14058985A JPS624608A JP S624608 A JPS624608 A JP S624608A JP 60140589 A JP60140589 A JP 60140589A JP 14058985 A JP14058985 A JP 14058985A JP S624608 A JPS624608 A JP S624608A
- Authority
- JP
- Japan
- Prior art keywords
- groove
- shallow
- depth
- tire
- main
- 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.)
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Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は雪路走行性および舗装路走行性の両方を満足す
るトレッドパターンを有する空気入りタイヤに関するも
のである。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a pneumatic tire having a tread pattern that satisfies both snow road performance and paved road performance.
従来のスノー専用タイヤは、雪路上での走行性を向上さ
せるため、そのトレッドデザインが一般の舗装路走行用
タイヤに比べて、接地面内に占める溝が多く、かつ溝深
さが深く設計されている。特に、ショルダー部には、タ
イヤ周方向る延びるように設けた主溝とタイヤ外側とを
連結するように複数のラグ溝を配設し、ブロック列を形
成するようにしているのが普通である。Conventional snow-specific tires have a tread design that occupies more grooves in the contact patch and has deeper grooves than regular tires for use on paved roads, in order to improve running performance on snowy roads. ing. In particular, it is common for a plurality of lug grooves to be arranged in the shoulder part to connect the main groove extending in the circumferential direction of the tire and the outside of the tire, forming a block row. .
ところが、上記構造のスノー専用タイヤは、主溝とラグ
溝とが交差する部分、すなわちブロックの角部が他の部
分に比べて大幅に剛性が低下し、それによってタイヤ周
方向のデザインの周期性が強調され、またブロックの動
きが大きくなり、舗装路を走行するときに騒音（パター
ンノイズ）を発生する原因になっている。However, in snow-specific tires with the above structure, the part where the main groove and the lug groove intersect, that is, the corner of the block, has significantly lower rigidity than other parts, which causes periodicity in the design in the tire circumferential direction. is emphasized, and the movement of the blocks increases, causing noise (pattern noise) when driving on paved roads.
従来、このようなスノー専用タイヤが発生する騒音を改
善して、雪路と舗装路との両方を走行可能にするタイヤ
が提案されてはいるが、騒音性能を改善すると雪路走行
性能を低下させてしまい、両性能を完全に両立させるよ
うにしたものが、いまだにないのが現状である。In the past, tires have been proposed that improve the noise generated by these snow-specific tires and enable them to run on both snowy and paved roads, but improving noise performance reduces performance on snowy roads. The current situation is that there is still no product that perfectly balances both performances.
本発明の目的は、舗装路走行での騒音発生を低下させな
がら、雪路走行性能の低下を最小限にとどめることがで
きる、特に乗用車用として好適な空気入りタイヤを提供
することにある。An object of the present invention is to provide a pneumatic tire particularly suitable for use in passenger cars, which can minimize deterioration in driving performance on snowy roads while reducing noise generation when driving on paved roads.
上記目的を達成する本発明は、トレッドにタイヤ周方向
に延びる複数の主溝と、その最外側の主溝とタイヤ外側
とを連結してショルダー部にブロック列を形成する複数
のラグ溝とを配設した空気入りタイヤにおいて、前記ラ
グ溝が主溝に対し接続する部分に浅溝部を形成し、この
浅溝部を次の式
％式％
〔ただし、Ｇ＝ （ＧＩ ＋ＧＺ ）／２であって、Ｇ
Ｉは主溝の深さ、Ｇｚはラグ溝の深さ、ｇは浅溝部の深
さ、Ｌはラグ溝の主溝から接地端までのタイヤ断面方向
長さ、βは浅溝部のタイヤ断面方向長さ〕の範囲に特定
したことを特徴とするものである。The present invention achieves the above object by providing a tread with a plurality of main grooves extending in the circumferential direction of the tire, and a plurality of lug grooves connecting the outermost main groove with the outside of the tire to form a block row in the shoulder portion. In the installed pneumatic tire, a shallow groove portion is formed at the portion where the lug groove connects to the main groove, and this shallow groove portion is defined by the following formula % [where G = (GI + GZ ) / 2 and ,G
I is the depth of the main groove, Gz is the depth of the lug groove, g is the depth of the shallow groove, L is the length of the lug groove in the cross-sectional direction of the tire from the main groove to the contact edge, and β is the cross-sectional direction of the tire in the shallow groove. length].
以下、本発明を図に示す実施例を参照して説明する。 Hereinafter, the present invention will be explained with reference to embodiments shown in the drawings.
第１図は本発明の実施例による空気入りタイヤのトレッ
ドパターンを示し、第２図は第１図のＡ−Ａ矢視断面を
示するものである。FIG. 1 shows a tread pattern of a pneumatic tire according to an embodiment of the present invention, and FIG. 2 shows a cross section taken along the line A--A in FIG.
これらの図において、トレッド中央部１０には３本の主
溝１．１．１がタイヤ周方向に延長させて設けられ、互
いに隣接する主溝１．１間には複数の補助溝２．−・−
・・・、２がラジアル方向に横切るように設けられ、複
数のブロック４゜・・−・・、４の列を形成している。In these figures, three main grooves 1.1.1 are provided in the tread center portion 10 extending in the tire circumferential direction, and a plurality of auxiliary grooves 2.1.1 are provided between adjacent main grooves 1.1. −・−
. . , 2 are provided across the radial direction, forming a row of a plurality of blocks 4° . . . , 4.
また、ショルダー部１１には、最外側の主溝１とタイヤ
外側とをラジアル方向に連結するように複数のラグ溝３
、・・−，３が連結し、複数のブロック５．−・−〜・
・、５の列を形成している。The shoulder portion 11 also includes a plurality of lug grooves 3 so as to connect the outermost main groove 1 and the outside of the tire in the radial direction.
,...-,3 are connected and a plurality of blocks 5. −・−〜・
, forming a row of 5.
上記主溝１は最も深い深さＧ１に形成され、補助溝２と
ラグ溝３とは、それよりもやや浅い深さＧ ｔ、 Ｇ
ｚ’になっている。また、補助溝２とラグ溝３には、主
溝１と接続する部分に浅溝部２ａ、３ａをそれぞれ形成
し、その深さが上記深さＧｚ、Ｇｚ’よりも浅いｇ、
ｇ’になっている。The main groove 1 is formed at the deepest depth G1, and the auxiliary grooves 2 and the lug grooves 3 are formed at slightly shallower depths Gt, G.
It has become z'. In addition, shallow groove portions 2a and 3a are formed in the auxiliary groove 2 and the lug groove 3 at the portions connecting with the main groove 1, respectively, and the depth thereof is shallower than the above-mentioned depths Gz and Gz'.
It has become g'.
また、これら補助溝２とラグ溝３のタイヤ断面方向（ラ
ジアル方向）の長さは、それぞれり。Furthermore, the lengths of the auxiliary grooves 2 and the lug grooves 3 in the tire cross-sectional direction (radial direction) are different.
Ｌ゛になっている。It is set to L.
上述のように補助溝２およびラグ溝３が主溝１と接続す
る部分に、浅溝部２ａ、３ａを部分的に形成したことに
より、各ブロック４．５の角部の剛性が向上し、タイヤ
周方向における剛性を均質化させることによってデザイ
ンの周期性を弱めることがで、さらに舗装路走行時のブ
ロック４．５の大きな動きを抑制し、低騒音化をはかる
ことができる。As described above, by partially forming the shallow grooves 2a and 3a at the portions where the auxiliary grooves 2 and the lug grooves 3 connect with the main groove 1, the rigidity of the corners of each block 4.5 is improved, and the tire By homogenizing the rigidity in the circumferential direction, the periodicity of the design can be weakened, further suppressing large movements of the block 4.5 when traveling on a paved road, and reducing noise.
また、このように浅溝部２ａ、３ａを設けても、この浅
溝部２ａ、３ａは部分的に設けられているだけであるの
で、雪面走行時には補助溝２やラグ溝３のトラクション
を大幅に低下することはない。Furthermore, even if the shallow grooves 2a, 3a are provided in this way, since these shallow grooves 2a, 3a are only partially provided, the traction of the auxiliary grooves 2 and lug grooves 3 is greatly reduced when driving on snowy surfaces. There will be no decline.
本発明者等の検討によると、上記浅溝部による作用効果
は、トレッド中央部１０における補助溝２の浅溝部２ａ
によるものよりも、ショルダー部１１におけるラグ溝３
の浅溝部３ａによるものの方が顕著に作用する。そのた
め、必要により補助溝の浅溝部２ａの方は省略し、ラグ
溝３の浅溝部３ａだけを設けるようにしてもよい。かつ
、このラグ溝３に設ける浅溝部３ａは、主溝１とラグ溝
３との深さの平均値ＧをＧ＝（ａｔ ＋Ｑ、）／２とす
るとき、その浅溝部３ａの深さｇの平均値Ｇに対する比
ｇ ／ Ｇを、０゜５５〜０．７０、好ましくは０．６
０〜０．６５にし、かつその浅溝部３ａの長さｌのラグ
溝３の長さしに対する比／／Ｌを、０．２０〜０゜３５
、好ましくは０．２５〜０．３０とすることが必要であ
ることを見出した。According to the studies of the present inventors, the effect of the above-mentioned shallow groove is that the shallow groove 2a of the auxiliary groove 2 in the tread center portion
The lug groove 3 in the shoulder part 11
The effect due to the shallow groove portion 3a is more pronounced. Therefore, if necessary, the shallow groove portion 2a of the auxiliary groove may be omitted and only the shallow groove portion 3a of the lug groove 3 may be provided. Moreover, when the average value G of the depths of the main groove 1 and the lug groove 3 is G=(at+Q,)/2, the shallow groove portion 3a provided in the lug groove 3 has a depth g of the shallow groove portion 3a. The ratio g/G to the average value G of 0°55 to 0.70, preferably 0.6
0 to 0.65, and the ratio of the length l of the shallow groove portion 3a to the length of the lug groove 3 is 0.20 to 0°35.
, preferably 0.25 to 0.30.
さらに、トレッド中央部工Ｏにおける補助溝２にも浅溝
部２ａを設ければ、上記作用効果をさらに高めることが
できるが、このときの浅溝部２ａの深さｇ゛の主溝１の
深さＧ＋ と補助溝２の深さＧ２’との平均平均深さＧ
’ ＝（Ｃ＋ ＋０２°）／２に対する比ｇ’ ／Ｇ”
は、０．６０〜０．８０、さらに好ましくは０．６５〜
０゜７５とし、また浅溝部２ａの長さｌ゛の補助溝２の
長さＬ゛に対する比！”／Ｌ’ は、０．１５〜０．２
５、さらに好ましくは０．１５〜０゜２０とするのがよ
い。Furthermore, if the shallow groove part 2a is also provided in the auxiliary groove 2 in the tread center part O, the above-mentioned effect can be further enhanced. Average average depth G between G+ and depth G2' of auxiliary groove 2
'=(C+ +02°)/2 ratio g'/G''
is 0.60 to 0.80, more preferably 0.65 to
0°75, and the ratio of the length L of the shallow groove portion 2a to the length L of the auxiliary groove 2! "/L' is 0.15 to 0.2
5, more preferably 0.15 to 0.20.
第３図はｇ’ ／Ｇ’ ＝０．７０． ｊ２’ ／Ｌ’
＝０．２０とし、かつｊ！／Ｌ＝０．２５と設定し、ラ
グ溝３の浅溝部３ａの深さｇを種々変えたときの、雪路
走行性能と騒音性能とを実験した結果を示すものである
。横軸にｇ／Ｇをとり、また縦軸の雪路走行性能は、直
進（平坦、登板、下坂を含む）、コーナリングを含む雪
路での駆動力および制動力、並びにコーナリング時の安
定性等の総合フィーリング評価を５点法で示したもので
、評価点が大きいほど優れていることを示しており、３
点以上が実用可能なレベルである。この雪路走行性能は
、一般のスノー専用タイヤでは３．５〜４．５であり、
また舗装路走行用タイヤでは２．５以下になっている。In Figure 3, g'/G' = 0.70. j2'/L'
=0.20, and j! The graph shows the results of an experiment on snowy road running performance and noise performance when the depth g of the shallow groove portion 3a of the lug groove 3 was set as /L=0.25 and variously changed. The horizontal axis shows g/G, and the vertical axis shows driving performance on snowy roads, such as driving force and braking force on snowy roads including straight driving (flat, uphill, and downhill), cornering, and stability when cornering. The overall feeling evaluation is shown on a 5-point scale, and the higher the evaluation score, the better it is.
A score above is a practical level. This snow road driving performance is 3.5 to 4.5 for general snow tires.
In addition, tires for driving on paved roads have a rating of 2.5 or less.
また、同じく縦軸の騒音性能は、良路で速度１００に＋
ａ／ｈからの惰行時のフィーリング評価を５点法で示し
たもので、評価点が大きいほど優れていることを示し、
３点以上が実用可能なレベルである。この騒音性能うは
、一般のスノー専用タイヤでは２．５以下であり、また
舗装路走行用タイヤでは２．５〜４．５のレベルになっ
ている。Also, the noise performance on the vertical axis is + at speed 100 on a good road.
The feeling evaluation when coasting from A/H is shown using a 5-point system, and the higher the evaluation score, the better it is.
A score of 3 or more is a practical level. This noise performance is 2.5 or less for general snow tires, and is at a level of 2.5 to 4.5 for tires for use on paved roads.
この第３図から、ｇ ／ Ｇが０．５５より小さいと、
ブロック５の角部の剛性が急激に上がると推定され、雪
上走行性能が急激に低下していることがわかる。また、
０．７より大きくなると、ブロック５の角部の剛性が他
の部分に比べて大幅に低くなって、タイヤ周方向のデザ
インの周期性が強調されるようになり、かつブロックの
動きが大きくなるものと推定され、それによって騒音が
大きくなって騒音性能が急激に低下していることがわか
る。From this figure 3, if g/G is smaller than 0.55,
It is estimated that the rigidity of the corners of the block 5 increases rapidly, and it can be seen that the running performance on snow decreases rapidly. Also,
If it is larger than 0.7, the rigidity of the corners of the block 5 will be significantly lower than other parts, the periodicity of the design in the tire circumferential direction will be emphasized, and the movement of the block will become large. It can be seen that the noise is increased and the noise performance is rapidly decreased.
また、第４図は、ｇ／Ｇ＝０．６０に設定し、浅溝部３
ａの長さｌを種々変化させたときの雪上走行性能と騒音
性能とを示したものであるｌ／上が横軸にとられ、縦軸
に上述したフィーリング評価による雪上走行性能と騒音
性能とがとられている。In addition, in Fig. 4, g/G is set to 0.60, and the shallow groove part 3
This shows the running performance on snow and noise performance when the length l of a is varied.l/Top is taken on the horizontal axis, and the vertical axis shows the running performance on snow and noise performance based on the above-mentioned feeling evaluation. It is pointed.
この第４図から、Ｉｔ／Ｌ、が０．２０より小さくなる
と、浅溝部３ａを設けたことの効果が十分でなくなり、
騒音性能が低下してしまい、また０、３５より大きくす
ると、ブロック５の角部の剛性が高くなりすぎて、雪路
走行性能が低下してしまうことがわかる。From this FIG. 4, when It/L becomes smaller than 0.20, the effect of providing the shallow groove portion 3a becomes insufficient.
It can be seen that the noise performance deteriorates, and when the value is larger than 0.35, the rigidity of the corner portions of the block 5 becomes too high, resulting in a decrease in driving performance on snowy roads.
上述したように、本発明の空気入りタイヤは、ショルダ
ー部にブロック列を形成するように設けたラグ溝が、タ
イヤ周方向の主溝と接続する部分に浅溝部を形成し、し
かもその浅溝部の大きさを上述したｇ ／ Ｇと１７Ｌ
との関係を満足するように設定したことにより、ショル
ダー部のブロックの角部を適度に剛性アップし、それに
よって舗装路走行時における騒音の発生を低減し、しか
も雪面での走行性能の低下を最小限にとどめることがで
きる。As described above, in the pneumatic tire of the present invention, the lug grooves provided in the shoulder portion so as to form block rows form a shallow groove portion at the portion connecting to the main groove in the circumferential direction of the tire, and the shallow groove portion g/G and 17L as described above
By setting the structure to satisfy the relationship between can be kept to a minimum.
第１図は本発明の実施例による空気入りタイヤのトレッ
ドパターンを示す平面図、第２図は第１図のＡ−Ａ矢視
図、第３図はタイヤのラグ溝におけるｇ／Ｇと雪上走行
性能および騒音性能との関係図、第４図はタイヤのラグ
溝における１／Ｌと雪上走行性能および騒音性能との関
係図である。
１−主溝、 ３−ラグ溝、 ３ａ−浅溝部、５−ブロッ
ク、 １１−ショルダー部。FIG. 1 is a plan view showing a tread pattern of a pneumatic tire according to an embodiment of the present invention, FIG. 2 is a view taken along arrow A-A in FIG. FIG. 4 is a diagram showing the relationship between 1/L of the lug groove of a tire and the snow performance and noise performance. 1-Main groove, 3-Lag groove, 3a-Shallow groove part, 5-Block, 11-Shoulder part.
Claims (1)
外側の主溝とタイヤ外側とを連結してショルダー部にブ
ロック列を形成する複数のラグ溝とを配設した空気入り
タイヤにおいて、前記ラグ溝が主溝に対し接続する部分
に浅溝部を形成し、この浅溝部を次の式 ｇ／Ｇ＝０．５５〜０．７０ ｌ／Ｌ＝０．２０〜０．３５ 〔ただし、Ｇ＝（Ｇ＿１＋Ｇ＿２）／２であって、Ｇ＿
１は主溝の深さ、Ｇ＿２はラグ溝の深さ、ｇは浅溝部の
深さ、Ｌはラグ溝の主溝から接地端までのタイヤ断面方
向長さ、ｌは浅溝部のタイヤ断面方向長さ〕の範囲に特
定したことを特徴とする空気入りタイヤ。[Claims] The tread is provided with a plurality of main grooves extending in the circumferential direction of the tire, and a plurality of lug grooves connecting the outermost main groove with the outside of the tire to form a block row in the shoulder portion. In a pneumatic tire, a shallow groove is formed at the portion where the lug groove connects to the main groove, and this shallow groove is defined by the following formula: g/G=0.55-0.70 l/L=0.20-0 .35 [However, G=(G_1+G_2)/2, and G_
1 is the depth of the main groove, G_2 is the depth of the lug groove, g is the depth of the shallow groove, L is the length of the lug groove in the cross-sectional direction of the tire from the main groove to the contact edge, l is the cross-sectional direction of the tire in the shallow groove A pneumatic tire characterized by having a specified length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60140589A JPS624608A (en) | 1985-06-28 | 1985-06-28 | Pneumatic tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60140589A JPS624608A (en) | 1985-06-28 | 1985-06-28 | Pneumatic tire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS624608A true JPS624608A (en) | 1987-01-10 |
Family
ID=15272199
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60140589A Pending JPS624608A (en) | 1985-06-28 | 1985-06-28 | Pneumatic tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS624608A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6220322B1 (en) * | 1998-02-12 | 2001-04-24 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire including tie bars |
| US6435237B1 (en) * | 2000-06-14 | 2002-08-20 | The Goodyear Tire & Rubber Company | Pneumatic tire having generally rounded footprint shape |
| US6439285B1 (en) * | 2000-06-14 | 2002-08-27 | The Goodyear Tire & Rubber Company | Pneumatic tire having 98 pitches |
| US6446689B1 (en) * | 2000-06-14 | 2002-09-10 | The Goodyear Tire & Rubber Company | Pneumatic tire having 80 to 105 pitches |
| JP2004009971A (en) * | 2002-06-11 | 2004-01-15 | Yokohama Rubber Co Ltd:The | Pneumatic tire |
| JP2007176282A (en) * | 2005-12-27 | 2007-07-12 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| US7422043B2 (en) | 2004-07-20 | 2008-09-09 | Toyo Tire & Rubber Co., Ltd. | Pneumatic tire with tread having circumferential sub-grooves including at least three raised portions |
| US20100186861A1 (en) * | 2009-01-26 | 2010-07-29 | The Yokohama Rubber Co., Ltd. | Pneumatic tire |
| US20160152087A1 (en) * | 2014-11-28 | 2016-06-02 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
| US20180065417A1 (en) * | 2015-03-10 | 2018-03-08 | The Yokohama Rubber Co., Ltd. | Pneumatic Tire |
| US20220371381A1 (en) * | 2021-05-18 | 2022-11-24 | Sumitomo Rubber Industries, Ltd. | Tire |
-
1985
- 1985-06-28 JP JP60140589A patent/JPS624608A/en active Pending
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6220322B1 (en) * | 1998-02-12 | 2001-04-24 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire including tie bars |
| US6435237B1 (en) * | 2000-06-14 | 2002-08-20 | The Goodyear Tire & Rubber Company | Pneumatic tire having generally rounded footprint shape |
| US6439285B1 (en) * | 2000-06-14 | 2002-08-27 | The Goodyear Tire & Rubber Company | Pneumatic tire having 98 pitches |
| US6446689B1 (en) * | 2000-06-14 | 2002-09-10 | The Goodyear Tire & Rubber Company | Pneumatic tire having 80 to 105 pitches |
| JP2004009971A (en) * | 2002-06-11 | 2004-01-15 | Yokohama Rubber Co Ltd:The | Pneumatic tire |
| US7422043B2 (en) | 2004-07-20 | 2008-09-09 | Toyo Tire & Rubber Co., Ltd. | Pneumatic tire with tread having circumferential sub-grooves including at least three raised portions |
| JP4537952B2 (en) * | 2005-12-27 | 2010-09-08 | 住友ゴム工業株式会社 | Pneumatic tire |
| JP2007176282A (en) * | 2005-12-27 | 2007-07-12 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| US20100186861A1 (en) * | 2009-01-26 | 2010-07-29 | The Yokohama Rubber Co., Ltd. | Pneumatic tire |
| US8763659B2 (en) * | 2009-01-26 | 2014-07-01 | The Yokohama Rubber Co., Ltd. | Pneumatic tire with tread having sub-grooves and sipes |
| US20160152087A1 (en) * | 2014-11-28 | 2016-06-02 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
| US10266012B2 (en) * | 2014-11-28 | 2019-04-23 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
| US20180065417A1 (en) * | 2015-03-10 | 2018-03-08 | The Yokohama Rubber Co., Ltd. | Pneumatic Tire |
| US11021019B2 (en) * | 2015-03-10 | 2021-06-01 | The Yokohama Rubber Co., Ltd. | Pneumatic tire |
| US20220371381A1 (en) * | 2021-05-18 | 2022-11-24 | Sumitomo Rubber Industries, Ltd. | Tire |
| US11932058B2 (en) * | 2021-05-18 | 2024-03-19 | Sumitomo Rubber Industries, Ltd. | Tire |
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