JPH03139402A - Pneumatic tire - Google Patents
Pneumatic tireInfo
- Publication number
- JPH03139402A JPH03139402A JP1277766A JP27776689A JPH03139402A JP H03139402 A JPH03139402 A JP H03139402A JP 1277766 A JP1277766 A JP 1277766A JP 27776689 A JP27776689 A JP 27776689A JP H03139402 A JPH03139402 A JP H03139402A
- Authority
- JP
- Japan
- Prior art keywords
- tread
- tire
- width
- ground contact
- ratio
- 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
Links
- 239000011324 bead Substances 0.000 claims description 10
- 230000002093 peripheral effect Effects 0.000 abstract 2
- 230000001105 regulatory effect Effects 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 239000002964 rayon Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/04—Tread patterns in which the raised area of the pattern consists only of continuous circumferential ribs, e.g. zig-zag
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/0306—Patterns comprising block rows or discontinuous ribs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/11—Tread patterns in which the raised area of the pattern consists only of isolated elements, e.g. blocks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C2200/00—Tyres specially adapted for particular applications
- B60C2200/14—Tyres specially adapted for particular applications for off-road use
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、−船道路における走行性能を維持しつつオフ
ロード性能を向上した空気入りタイヤに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pneumatic tire that has improved off-road performance while maintaining driving performance on marine roads.
近年、−船道路における走行性能の向上を計るため、ト
レッド巾を広くし、接地面積を増大した偏平タイヤが多
用されつつある。又、このような偏平タイヤは、トレッ
ド部が広巾である故に、耐衝撃力も具えているため、凹
凸の多い悪路、さらには道路外の軟土地、泥地、積雪地
、即ちオフロードの走行にも使用されている。In recent years, flat tires with wider tread widths and increased ground contact areas have been increasingly used to improve driving performance on shipping roads. In addition, since such flat tires have a wide tread, they also have impact resistance, so they can be used on rough roads with many bumps, as well as off-road driving on soft, muddy, and snowy areas. It is also used in
しかし一般道路走行用として形成された偏平タイヤを用
いてオフロードを走行した場合、例えば泥地を走行した
場合には泥の排除が十分でなく、走行性能が著しく阻害
される一方、雨天走行時においては雨水の排出が不十分
であることによって、スリップが生じ易いなど問題があ
り、又積雪時においても雪を把持する把持力が不足しス
リップが生じ易い、このように従来のような偏平タイヤ
を用いてオフロードを走行するには走行性能が劣り又安
全性に欠ける。However, when driving off-road using flat tires designed for general roads, for example, when driving on muddy ground, the removal of mud is insufficient and driving performance is significantly impaired. However, there are problems such as slippage due to insufficient drainage of rainwater, and also slippage due to lack of gripping force when it snows. Driving off-road using a vehicle has poor driving performance and lacks safety.
従って需要家の間では、一般道路の走行に優れた性能を
有する偏平タイヤであって、しかもオフロードをも走行
しうるものの出現の要望が高まりつつあった。Accordingly, there has been an increasing demand among consumers for a flat tire that has excellent performance for running on general roads, and that can also be run off-road.
本発明は、トレンド面の中央部に周方向にのびる中央溝
を設けかつ中央溝の両側に設けた接地部の巾寸度を規制
することを基本として、一般道路における走行性能を保
持しつつオフロード性能を向上しうる空気入りタイヤの
提供を目的としている。The present invention is based on providing a central groove extending in the circumferential direction in the center of the trend surface and regulating the width of the ground contact portions provided on both sides of the central groove. The aim is to provide pneumatic tires that can improve road performance.
本発明は、偏平率が０．４５以上かつ０．７８以下であ
り、正規のリムに装着しかつ正規内圧状態におけるトレ
ンド部のタイヤ軸方向外縁間の距離であるトレッド巾（
ＴＷ）とタイヤ最大巾（ＳＷ）との比（ＴＷ／ＳＷ）が
０．８５以上かつ１．０以下とするとともに、前記トレ
ッド部からサイドウオール部を通リピート部のビードコ
アの周りを折返すカーカスと、前記トレッド部の内方か
つ前記カーカスの半径方向外側に配される２枚以上のベ
ルトプライからなるベルト層とを具え、かつ前記トレン
ド部の外面がなすトレンド面の中央部にタイヤ周方向に
のびる中央Ｊ （Ｇ）を設けることにより、該中央溝Ｃ
Ｇ）の両側に夫々接地部（ＳＬ、ＳＲ）を形成し、しか
も一方の接地部（ＳＬ）のタイヤ軸方向の巾（ＬＷ）と
他方の接地部（ＳＲ）のタイヤ軸方向の巾（ＲＷ）との
和に対する前記トレンド巾（ＴＷ）の比（Ｒｗ＋ＬＷ）
／ＴＷを０．６以上かつ０．７５以下とする一方、前記
中央溝（Ｇ）の前記トレッド面からの溝深さ（ｄ１）と
、前記トレンド面から最外側のベルトプライの外側面ま
での距＃ （ｄ）との比（ｄｉ／ｄ）が０．５以上かつ
０．９以下とした空気入りタイヤである。The present invention has an aspect ratio of 0.45 or more and 0.78 or less, and a tread width (which is the distance between the outer edges of the tire in the axial direction of the trend part when mounted on a regular rim and under a regular internal pressure state).
TW) and the maximum tire width (SW) (TW/SW) is 0.85 or more and 1.0 or less, and a carcass that passes from the tread part to the sidewall part and wraps around the bead core of the repeat part. and a belt layer consisting of two or more belt plies disposed inside the tread portion and outside the carcass in the radial direction, and a belt layer consisting of two or more belt plies arranged on the inside of the tread portion and the outside of the carcass in the radial direction; By providing a central groove J (G) extending into the central groove C
G), and the axial width (LW) of one ground contact part (SL) and the axial width (RW) of the other ground contact part (SR) are formed on both sides of the ground contact part (SL, SR). ) of the trend width (TW) (Rw+LW)
/TW is 0.6 or more and 0.75 or less, and the groove depth (d1) of the central groove (G) from the tread surface and the distance from the trend surface to the outer surface of the outermost belt ply are The pneumatic tire has a ratio (di/d) of distance #(d) of 0.5 or more and 0.9 or less.
（作用〕
偏平率が０．４５〜０．７８の範囲である偏平タイヤと
して形成したため、接地面の巾方向寸度が大きく形成で
き、直進性、耐久性など路上走行の性能が向上するとと
もに、雪上を走行する際においても積上りが少なく走行
安定性を高めうる。又トレンド巾ＴＷとタイヤ最大巾Ｓ
Ｗとの比ＴＷ／ＳＷを０．８５〜１．００の範囲とした
ため、サイドウオール部は立ち上がりが急となり、タイ
ヤ半径方向に作用する作用力に対して、サイドウオール
部の腰折れが少となることによって、耐衝撃性が高まり
オフロードの走行性が向上する。(Function) Since the tire is formed as a flat tire with an aspect ratio in the range of 0.45 to 0.78, the width dimension of the contact patch can be made large, improving on-road running performance such as straight running performance and durability. Even when driving on snow, there is less accumulation and driving stability can be improved.In addition, the trend width TW and maximum tire width S
Since the ratio TW/SW to W is set in the range of 0.85 to 1.00, the sidewall part rises steeply, and the bending of the sidewall part is reduced in response to the force acting in the radial direction of the tire. This increases impact resistance and improves off-road driving performance.
又トレッド面の中央部に中央溝Ｇを設けかつ中央溝両側
の接地部ＳＬ、ＳＲの巾を規制したため、接地面積を確
保したうえ雪上走行、雨天走行性を高めることが出来、
又泥地走行時における泥の付着を排除できる。In addition, by providing a central groove G in the center of the tread surface and regulating the width of the ground contact areas SL and SR on both sides of the central groove, it is possible to secure the ground contact area and improve driving performance on snow and rain.
Also, it is possible to eliminate mud adhesion when driving on muddy ground.
しかも中央溝Ｇの深さを規制したため、溝下ゴムの厚さ
を確保し、ベルト層の損傷及び溝下ゴムからのクランク
の発生を阻止するとともに、トレッド面が摩耗すること
による中央溝Ｇの早期消滅を防止でき、耐久性を向上し
うる。Moreover, since the depth of the central groove G is regulated, it is possible to ensure the thickness of the rubber under the groove, prevent damage to the belt layer and occurrence of cranks from the rubber under the groove, and prevent the central groove G from being damaged due to wear of the tread surface. Early extinction can be prevented and durability can be improved.
このように本発明にあっては、前記各構成が有機的に結
合することにより、路上走行におけ走行性能、耐久性を
保持しつつオフロードにおける諸性能を向上することが
出来る。In this way, in the present invention, by organically combining each of the above-mentioned components, it is possible to improve various off-road performances while maintaining on-road running performance and durability.
以下本発明の一実施例を図面に基づき説明する。 An embodiment of the present invention will be described below based on the drawings.
図において本発明の空気入りタイヤ１は、ビードコアが
通る両側のビード部３．３と該ビード部からタイヤの半
径方向外向きにのびるサイドウオール部４．４とその上
端を継ぐトレッド部５とを有し、又トレッド部５からサ
イドウオール部４を通りビード部３の前記ビードコア２
の廻りを折返すカーカス６と、前記トレッド部５におい
てカーカス６のタイヤタイヤ半径方向外側に配されるベ
ルト層７とを具える。In the figure, the pneumatic tire 1 of the present invention includes bead portions 3.3 on both sides through which bead cores pass, sidewall portions 4.4 extending outward in the radial direction of the tire from the bead portions, and a tread portion 5 joining the upper ends of the sidewall portions 4.4. The bead core 2 of the bead portion 3 passes from the tread portion 5 through the sidewall portion 4.
The tire includes a carcass 6 that is folded back around the tread portion 5, and a belt layer 7 disposed on the outside of the carcass 6 in the radial direction of the tire in the tread portion 5.
カーカス６はカーカスコードをタイヤ赤道Ｃに対して本
実施例では３０度〜９０度の角度で傾けて配列したラジ
アル又はセミラジアル方向の配列体であり、又カーカス
コードとしてスチールコードの他、ナイロン、ポリエス
テル、レーヨン等の繊維コードが用いられる。The carcass 6 is a radial or semi-radial arrangement in which carcass cords are arranged at an angle of 30 degrees to 90 degrees with respect to the tire equator C, and the carcass cords include steel cords, nylon cords, etc. Fiber cords such as polyester and rayon are used.
ベルト層７は、前記トレッド部５の内方、かつカーカス
６の半径方向外側に配される２枚以上、本実施例では２
枚のベルトプライ９Ａ、９Ｂからなり各ベルトプライ９
は傾斜して配されるベルトコードを具え、本実施例では
、一方のベルトプライ９Ａは、そのベルトコードをタイ
ヤ赤道に対して左上がりに１５度〜７０度の範囲で傾け
て配列する一方、他方のベルトプライ９Ｂは、そのベル
トコードを前記一方のベルトプライ９Ａとは逆に右上が
りに１５度〜７０度の範囲で傾けて配列している。この
ように２枚のベルトプライ９Ａ、９Ｂの各ベルトコード
を互いに交叉する向きに配列することにより、両プライ
によってタガ効果が生じトレッド部５の周方向、タイヤ
軸方向に対する剛性を高めうるのである。The belt layer 7 includes two or more layers arranged inside the tread portion 5 and outside the carcass 6 in the radial direction.
Each belt ply 9 consists of two belt plies 9A and 9B.
In this embodiment, one belt ply 9A has its belt cord arranged at an angle of 15 degrees to 70 degrees upward to the left with respect to the tire equator. The other belt ply 9B has its belt cord arranged so as to be tilted upward to the right within a range of 15 degrees to 70 degrees, contrary to the one belt ply 9A. By arranging the belt cords of the two belt plies 9A and 9B in a direction that intersects with each other in this manner, a hoop effect is produced by both plies, and the rigidity of the tread portion 5 in the circumferential direction and the tire axial direction can be increased. .
又空気入りタイヤ１は正規のリムに装着しかつ正規内圧
の付加状態において、タイヤ高さＨとタイヤ最大巾ＳＷ
との比である偏平率Ｈ／ＳＷを０゜４５以上かつ０．７
８以下としている。In addition, when the pneumatic tire 1 is mounted on a regular rim and the regular internal pressure is applied, the tire height H and the tire maximum width SW are
The aspect ratio H/SW is 0°45 or more and 0.7
It is set to be 8 or less.
偏平率Ｈ／ＳＷが０．４５以下になると接地面がタイヤ
軸方向に長（なり、−船路上走行において、乗心地及び
オフロードの走破性が低下する。他方、０．７８以上に
なると直進走行性が劣り高速域での走行性能が低下する
。When the aspect ratio H/SW is less than 0.45, the contact patch becomes longer in the axial direction of the tire, which reduces ride comfort and off-road running performance when driving on ships.On the other hand, when it becomes more than 0.78, the tire runs in a straight line Driving performance is poor and driving performance at high speeds is reduced.
さらに本発明では、前記の如くリムに装着しかつ内圧付
加状態において、トレッド部５のタイヤ軸方向外縁ＥＳ
Ｅ間の距離であるトレッド巾ＴＷと前記タイヤ最大巾そ
の比を０．８５以上かつ１．０以下としている。前記比
が０．８５以下になるとタイヤに荷重が加わった場合に
はサイドウオール部４が腰折れするなどサイドウオール
部４の曲げ変形量が大となることによって、サイドウオ
ール部４及びと−ド部３に大きな曲げ応力が作用するこ
とにより、オフロード走行に際して重要な要素となる耐
衝撃性を向上することが出来ない。Furthermore, in the present invention, when the tread portion 5 is mounted on the rim and the internal pressure is applied, the outer edge ES of the tread portion 5 in the axial direction
The ratio between the tread width TW, which is the distance between E and the tire maximum width, is set to be 0.85 or more and 1.0 or less. If the ratio is less than 0.85, the amount of bending deformation of the sidewall portion 4 becomes large, such as bending of the sidewall portion 4 when a load is applied to the tire. Due to the large bending stress acting on No. 3, impact resistance, which is an important factor in off-road driving, cannot be improved.
従ってオフロード走行のためには前記雨中の比ＴＷ／Ｓ
Ｗを０．８５以上にする必要がある。Therefore, for off-road driving, the ratio TW/S in the rain is
It is necessary to make W 0.85 or more.
トレンド面１０には、その中央部にタイヤ周方向にのび
る広巾の中央溝Ｇが設けられ、該中央溝Ｇによって、そ
の両側に夫々一方の接地部ＳＬ。A wide central groove G extending in the tire circumferential direction is provided in the center of the trend surface 10, and one ground contact portion SL is formed on each side of the central groove G by the central groove G.
他方のＳＲが形成される。The other SR is formed.
一方の接地部ＳＬのタイヤ軸方向の巾ＬＷと他方の接地
部ＳＲのタイヤ軸方向の巾ＲＷとの和に対する前記トレ
ンド巾ＴＷとの比（ＲＷ＋ＬＷ）／ＴＷを０．６以上か
つ０．７５以下としている。The ratio of the trend width TW to the sum of the width LW in the tire axial direction of one ground contact part SL and the width RW in the tire axial direction of the other ground contact part SR (RW+LW)/TW is 0.6 or more and 0.75 It is as follows.
なお一方、他方の接地部ＳＬ、ＳＲの巾寸度は必ずしも
同−巾寸度とする必要はないが、両接地部の巾寸度の比
を１：０．７以上することが望ましい。On the other hand, the widths of the other grounding portions SL and SR do not necessarily have to be the same width, but it is desirable that the ratio of the widths of both grounding portions be 1:0.7 or more.
又前記（ＲＷ＋ＬＷ）／ＴＷの比が０．６以下では接地
部が狭小となり一般道路における走行性能が低下する一
方、前記比が０．７５以上になると中央溝Ｇが中挟とな
り、該中央溝Ｇに進入した雪、雨水、泥などの排出が不
良となるため、雪上走行性、ウェット走行性、泥地走行
性が低下する。Furthermore, if the ratio of (RW+LW)/TW is less than 0.6, the ground contact area becomes narrow and driving performance on general roads deteriorates, while if the ratio becomes more than 0.75, the central groove G becomes interposed, and the central groove Snow, rainwater, mud, etc. that have entered the G are poorly discharged, resulting in poor running performance on snow, wet running performance, and running performance on muddy ground.
なお中央溝Ｇはタイヤ赤道Ｃに沿う直線溝の他、前記比
（ＲＷ＋ＬＷ）／ＴＷが前記規制値内の範囲において、
第２図（ａ）に示すジグザグ状、さらには第２図世）に
示すように溝巾寸度がタイヤ周方向に対して漸増する溝
部ｇ１を周方向に連設して形成することも出来る。In addition to the straight groove along the tire equator C, the central groove G is a groove in which the ratio (RW+LW)/TW is within the regulation value.
It is also possible to form grooves g1 in a zigzag shape as shown in Figure 2(a), or even grooves g1 whose groove widths gradually increase in the circumferential direction of the tire as shown in Figure 2(a). .
又トレッド面１０において、第３図に示す如く中央溝Ｇ
の両側に周方向にのびる小中の副溝Ｇ１、Ｇ１さらには
中央溝Ｇと副溝Ｇ１との間、副溝Ｇｌとトレッド外縁Ｅ
との間に横溝Ｇ２、Ｇ３を設けることが出来る。しかし
前記接地面の規制に対しては前記副溝Ｇ１及び横溝Ｇ２
、Ｇ３のタイヤ軸方向の溝巾１１、Ｉ１２．１３を除外
した接地部で規制することとなる。Also, on the tread surface 10, as shown in FIG.
Small and medium auxiliary grooves G1, G1 extending in the circumferential direction on both sides of
Horizontal grooves G2 and G3 can be provided between the two. However, for regulating the ground contact surface, the sub groove G1 and the lateral groove G2
, G3, the axial groove width 11 and I12.13 are excluded from the ground contact area.
又トレンド部５において中央溝Ｇとのトレッド面１０か
らの溝深さｄ、と、トレッド面１０からベルト層７の最
外側のベルトプライ９Ｂの外側面までの距離ｄとの比（
ｄｌ／ｄ）を０．５以上かつ０゜９以下としている。In addition, the ratio of the groove depth d from the tread surface 10 to the central groove G in the trend portion 5 and the distance d from the tread surface 10 to the outer surface of the outermost belt ply 9B of the belt layer 7 (
dl/d) is set to be 0.5 or more and 0°9 or less.
前記比が０．５以下では、走行によるトレンド面１０の
摩耗により中央溝Ｇが早期に消滅し、その結果、接地部
ＳＬ、ＳＲを２分割した効果が短期間で消滅する。又前
記比が０．９以上になると溝下力のゴムの厚みが薄くな
り、ベル）７１７が損傷を受けやすく、又トレッド部５
の剛性か低下することによって、ゴムにクランクが生じ
る危険が高い。When the ratio is less than 0.5, the central groove G disappears early due to wear of the trend surface 10 due to running, and as a result, the effect of dividing the ground contact portions SL and SR into two disappears in a short period of time. Furthermore, if the ratio is 0.9 or more, the thickness of the rubber under the groove becomes thinner, the bell) 717 is more likely to be damaged, and the tread portion 5 is more likely to be damaged.
There is a high risk that the rubber will develop a crank due to a decrease in the rigidity of the rubber.
なおタイヤがキャンバ−角を有して車両に装着される場
合には、一方の接地面ＳＬを他方の接地面ＳＲに比べて
広巾に形成するとともに、一方の接地面ＳＬを車両の外
側に向けて装着することによって、接地面ＳＬ、ＳＲに
作用する荷重分布を均等化させ、偏摩耗を少なくするこ
とができる。Note that when the tire is mounted on a vehicle with a camber angle, one of the contact surfaces SL is formed wider than the other contact surface SR, and one of the contact surfaces SL is directed toward the outside of the vehicle. By attaching the bearings to the ground, it is possible to equalize the load distribution acting on the contact surfaces SL and SR, and to reduce uneven wear.
このように本発明の空気入りタイヤは種々な利用が可能
となる。In this way, the pneumatic tire of the present invention can be used in various ways.
タイヤサイズが２０５／６０Ｒ１４５１０１Ｌであり、
第１図の構成かつ第１表に示す仕様でタイヤを試作する
とともに、その性能を調査した、なお本願構成以外のタ
イヤについても比較例１〜４に示す仕様で試作し併せて
テストを行った。The tire size is 205/60R145101L,
A tire was prototyped with the configuration shown in Figure 1 and the specifications shown in Table 1, and its performance was investigated.Tires other than the configuration of the present application were also prototyped with the specifications shown in Comparative Examples 1 to 4, and tests were also conducted. .
テスト結果を第１表に示す。The test results are shown in Table 1.
一般道路上の走行性、ウェア）性能、雪上走行性能、泥
中走行性能は、何れもテストドライバーによる実車のフ
ィーリングテストを行ない５点法による評価である３、
０以上が合格域である。Drivability on general roads, wear) performance, snow driving performance, and mud driving performance are all evaluated using a 5-point method using a feeling test of the actual vehicle by a test driver3.
0 or more is a passing range.
又溝底クランクは実車により３０．０００−走行後にお
いて、溝底ゴムの割れの有無を調査した。In addition, the groove bottom crank was examined for cracks in the groove bottom rubber after 30,000 miles of travel using an actual vehicle.
本発明の空気入りタイヤは前記構成の中央溝を具えしか
も中央溝の両側の接地部の巾寸度を規制したため、道路
走行性能を低下させることなく軟土地、泥地、積雪地な
どのオフロード性能を向上でき、全地形走行用車両用の
タイヤとして好適に採用しうる。The pneumatic tire of the present invention has a central groove having the above-mentioned structure, and the width of the ground contact portions on both sides of the central groove is regulated. It can improve performance and can be suitably used as a tire for all-terrain vehicles.
第１図は本発明の一実施例を示す断面図、第２図（ａｌ
〜（′ｂ）及び第３図はトレッド面の他の例を示す部分
展開図である。
２−・・ビードコア、 ３・・・・ビード部、４−サ
イドウオール部、 ５−）レッド部、６・・−カーカ
ス、 ７・−ベルト層、９Ａ、９Ｂ−・ベルトプライ
、
１０−）−レッド面、 Ｃ・−・タイヤ赤道、Ｅ・−
外縁、 Ｇ −中央溝、
ＬＷＳＲＷ−巾、 ＳＲ，ＳＬ・−接地部、ＳＷ・・・
タイヤ最大巾、 Ｔ Ｗ−・トレッド巾、ｄ・−距離、
ｄＬ−溝深さ。FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG. 2 (al.
-('b) and FIG. 3 are partially developed views showing other examples of the tread surface. 2--bead core, 3--bead part, 4-side wall part, 5-) red part, 6--carcass, 7--belt layer, 9A, 9B--belt ply, 10-)- Red side, C.--tire equator, E.-
Outer edge, G - center groove, LWSRW - width, SR, SL - grounding part, SW...
Tire maximum width, T W-・Tread width, d・-distance,
dL - Groove depth.
Claims (1)
規のリムに装着しかつ正規内圧状態におけるトレッド部
のタイヤ軸方向外縁間の距離であるトレッド巾（ＴＷ）
とタイヤ最大巾（ＳＷ）との比（ＴＷ／ＳＷ）が０．８
５以上かつ１．０以下とするとともに、前記トレッド部
からサイドウォール部を通りビード部のビードコアの周
りを折返すカーカスと、前記トレッド部の内方かつ前記
カーカスの半径方向外側に配される２枚以上のベルトプ
ライからなるベルト層とを具え、かつ前記トレッド部の
外面がなすトレッド面の中央部にタイヤ周方向にのびる
中央溝（Ｇ）を設けることにより、該中央溝（Ｇ）の両
側に夫々接地部（ＳＬ、ＳＲ）を形成し、しかも一方の
接地部（ＳＬ）のタイヤ軸方向の巾（ＬＷ）と他方の接
地部（ＳＲ）のタイヤ軸方向の巾（ＲＷ）との和に対す
る前記トレッド巾（ＴＷ）の比（ＲＷ＋ＬＷ）／ＴＷを
０．６以上かつ０．７５以下とする一方、前記中央溝（
Ｇ）の前記トレッド面からの溝深さ（ｄ＿１）と、前記
トレッド面から最外側のベルトプライの外側面までの距
離（ｄ）との比（ｄ＿１／ｄ）が０．５以上かつ０．９
以下とした空気入りタイヤ。1 Tread width (TW), which is the distance between the outer edges of the tire in the axial direction of the tread part when the aspect ratio is 0.45 or more and 0.78 or less, and when the tire is mounted on a regular rim and under regular internal pressure.
and the maximum tire width (SW) (TW/SW) is 0.8
5 or more and 1.0 or less, and a carcass that passes from the tread part through the sidewall part and folds around the bead core of the bead part, and 2 that is arranged inside the tread part and outside the carcass in the radial direction. and a belt layer consisting of at least one belt ply, and by providing a central groove (G) extending in the tire circumferential direction in the center of the tread surface formed by the outer surface of the tread portion, both sides of the central groove (G) are provided. A ground contact part (SL, SR) is formed on each of the ground contact parts (SL, SR), and the sum of the width (LW) of one ground contact part (SL) in the tire axial direction and the width (RW) of the other ground contact part (SR) in the tire axial direction. The ratio (RW+LW)/TW of the tread width (TW) to
G) the ratio (d_1/d) of the groove depth (d_1) from the tread surface to the distance (d) from the tread surface to the outer surface of the outermost belt ply is 0.5 or more and 0. 9
Pneumatic tires listed below.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1277766A JPH03139402A (en) | 1989-10-24 | 1989-10-24 | Pneumatic tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1277766A JPH03139402A (en) | 1989-10-24 | 1989-10-24 | Pneumatic tire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03139402A true JPH03139402A (en) | 1991-06-13 |
Family
ID=17588035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1277766A Pending JPH03139402A (en) | 1989-10-24 | 1989-10-24 | Pneumatic tire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03139402A (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0594380A1 (en) * | 1992-10-19 | 1994-04-27 | Sumitomo Rubber Industries Limited | Pneumatic tyre |
| JPH06143932A (en) * | 1992-11-11 | 1994-05-24 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| JPH06143937A (en) * | 1992-11-13 | 1994-05-24 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| EP0598568A1 (en) * | 1992-11-13 | 1994-05-25 | Sumitomo Rubber Industries Limited | Pneumatic tyre |
| JPH06191227A (en) * | 1992-12-25 | 1994-07-12 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| US5472030A (en) * | 1993-11-05 | 1995-12-05 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
| US5658404A (en) * | 1994-04-15 | 1997-08-19 | The Goodyear Tire & Rubber Company | Radial pneumatic light truck or automobile tire |
| US6119745A (en) * | 1994-04-11 | 2000-09-19 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire including only one wide groove |
| US6302174B1 (en) * | 1998-04-17 | 2001-10-16 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
| US6499520B1 (en) * | 1999-08-11 | 2002-12-31 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire with wide central groove |
| US6505661B1 (en) * | 2000-08-11 | 2003-01-14 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire having wide groove having two longitudinal ribs, intermediate ribs and lateral ribs |
| US7137424B2 (en) * | 2001-08-22 | 2006-11-21 | Sumitomo Rubber Industries, Ltd. | Tire used in winter having pair of rib portions and central vertical groove with saw-tooth shape |
| US8333226B2 (en) * | 2008-10-28 | 2012-12-18 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire with tread having first axial grooves and circumferential grooves including wavy circumferential groove |
| JP5798106B2 (en) * | 2010-02-22 | 2015-10-21 | 株式会社ブリヂストン | tire |
| US11498368B2 (en) * | 2017-10-27 | 2022-11-15 | Shinji Marui | Tire with enhanced tread |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6171203A (en) * | 1984-09-17 | 1986-04-12 | Bridgestone Corp | Pneumatic radial tire |
| JPS6147702B2 (en) * | 1980-03-14 | 1986-10-21 | Nyuurongu Kk |
-
1989
- 1989-10-24 JP JP1277766A patent/JPH03139402A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6147702B2 (en) * | 1980-03-14 | 1986-10-21 | Nyuurongu Kk | |
| JPS6171203A (en) * | 1984-09-17 | 1986-04-12 | Bridgestone Corp | Pneumatic radial tire |
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5435365A (en) * | 1992-10-19 | 1995-07-25 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
| EP0594380A1 (en) * | 1992-10-19 | 1994-04-27 | Sumitomo Rubber Industries Limited | Pneumatic tyre |
| US5679185A (en) * | 1992-10-19 | 1997-10-21 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
| EP0680837A3 (en) * | 1992-10-19 | 1996-04-03 | Sumitomo Rubber Ind | Pneumatic tyre. |
| JPH06143932A (en) * | 1992-11-11 | 1994-05-24 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| US5830294A (en) * | 1992-11-13 | 1998-11-03 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire including circumferential groove |
| US6026874A (en) * | 1992-11-13 | 2000-02-22 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire having circumferential groove |
| EP0598568A1 (en) * | 1992-11-13 | 1994-05-25 | Sumitomo Rubber Industries Limited | Pneumatic tyre |
| JPH06143937A (en) * | 1992-11-13 | 1994-05-24 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| JPH06191227A (en) * | 1992-12-25 | 1994-07-12 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
| US5472030A (en) * | 1993-11-05 | 1995-12-05 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
| US6119745A (en) * | 1994-04-11 | 2000-09-19 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire including only one wide groove |
| US5658404A (en) * | 1994-04-15 | 1997-08-19 | The Goodyear Tire & Rubber Company | Radial pneumatic light truck or automobile tire |
| US6302174B1 (en) * | 1998-04-17 | 2001-10-16 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
| US6499520B1 (en) * | 1999-08-11 | 2002-12-31 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire with wide central groove |
| US6505661B1 (en) * | 2000-08-11 | 2003-01-14 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire having wide groove having two longitudinal ribs, intermediate ribs and lateral ribs |
| US7137424B2 (en) * | 2001-08-22 | 2006-11-21 | Sumitomo Rubber Industries, Ltd. | Tire used in winter having pair of rib portions and central vertical groove with saw-tooth shape |
| CN1319762C (en) * | 2001-08-22 | 2007-06-06 | 住友橡胶工业株式会社 | Tire used in winter |
| US8333226B2 (en) * | 2008-10-28 | 2012-12-18 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire with tread having first axial grooves and circumferential grooves including wavy circumferential groove |
| JP5798106B2 (en) * | 2010-02-22 | 2015-10-21 | 株式会社ブリヂストン | tire |
| US11498368B2 (en) * | 2017-10-27 | 2022-11-15 | Shinji Marui | Tire with enhanced tread |
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