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JPH1134615A - Pneumatic tire - Google Patents

Pneumatic tire

Info

Publication number
JPH1134615A
JPH1134615A JP9190172A JP19017297A JPH1134615A JP H1134615 A JPH1134615 A JP H1134615A JP 9190172 A JP9190172 A JP 9190172A JP 19017297 A JP19017297 A JP 19017297A JP H1134615 A JPH1134615 A JP H1134615A
Authority
JP
Japan
Prior art keywords
tire
grooves
groove
wear
equatorial plane
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
JP9190172A
Other languages
Japanese (ja)
Other versions
JP3833785B2 (en
Inventor
Yasutoshi Aoki
康年 青木
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 JP19017297A priority Critical patent/JP3833785B2/en
Publication of JPH1134615A publication Critical patent/JPH1134615A/en
Application granted granted Critical
Publication of JP3833785B2 publication Critical patent/JP3833785B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To satisfy anti-skid performance on a wet road, traction performance, and cut appearance when a tire wears to the end. SOLUTION: This tire has peripheral deep grooves 16 in the range of 0.15TW-0.40TW (TW: tread width) from the center line of the equatorial plane of the tire to both sides in the direction of width of the tire and shoulder side lug grooves 22 outside the grooves 16. When the tire wears to the end, the depth of the peripheral deep grooves 16 and the shoulder side lug grooves 22 remains deep but the depth of the other peripheral grooves and lug grooves become null. Although a cut is apt to be produced in the range of 0.15TW from the center line of the equatorial plane of the tire to both the sides thereof, when the tire wears to the end, the grooves does not exist and hence a problem of cut appearance at the bottom of the grooves is solved. Since the peripheral deep grooves 16 remain in the range from the center line of the equatorial plane of the tire CL to 0.4TW, even when the tire wears to the end, the tire has sufficient anti-skid performance on a wet road. Since the shoulder lug grooves 22 remain until the tire wears to the end, the tire has sufficient traction performance until the tire wears to the end.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は空気入りタイヤに係
り、摩耗末期まで十分な耐カット性、ウエット時耐横滑
り性及びトラクション性が得られる重荷重車両用に適し
た空気入りタイヤに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic tire, and more particularly to a pneumatic tire suitable for heavy-duty vehicles, which provides sufficient cut resistance, wet skid resistance and traction until the end of wear.

【0002】[0002]

【従来の技術】従来、ダンプカー、トラック、バス、小
型トラック、建設用車両等の重荷重車両に装着される空
気入りタイヤには、ラグ溝とそれを継ぐ周方向の浅溝を
有するラグタイヤ、複数の周方向溝と最外側リブ上に周
方向溝よりも浅いラグ溝を有するリブラグタイヤ、複数
の周方向溝とラグ溝によりブロックを形成するブロック
タイヤ、複数の周方向溝のみを有するリブタイヤ等があ
る。
2. Description of the Related Art Conventionally, pneumatic tires mounted on heavy-duty vehicles such as dump trucks, trucks, buses, light trucks, construction vehicles and the like include lug tires having lug grooves and shallow circumferential grooves connecting the lug grooves. There is a rib-lug tire having a lug groove shallower than the circumferential groove on the circumferential groove and the outermost rib, a block tire forming a block by a plurality of circumferential grooves and a lug groove, a rib tire having only a plurality of circumferential grooves, and the like. .

【0003】[0003]

【発明が解決しようとする課題】リブラグタイヤは、タ
イヤ赤道面付近に摩耗末期まで残る周方向溝があるた
め、摩耗末期の溝底にカットを受け易くなり、カット外
観に問題があり、ショルダーリブ上の浅いラグ溝は、摩
耗中期以降消失するため、摩耗中期以降のトラクション
性に問題があった。
The rib-lug tire has a circumferential groove near the equatorial plane of the tire until the end of wear, so that the bottom of the groove at the end of wear is apt to be cut, and there is a problem in the appearance of the cut. Since the shallow lug grooves disappear after the middle wear period, there is a problem in the traction properties after the middle wear period.

【0004】ラグタイヤは、上記リブラグタイヤの摩耗
末期カット性、摩耗中期以降のトラクション性の問題は
ないが、摩耗末期まで残る周方向溝がないため、ウエッ
ト時の耐横滑り性、直進安定性が不足していた。
[0004] The lug tire does not have the problem of cutability of the rib-lug tire at the end of wear and traction after the middle wear, but lacks a circumferential groove that remains until the end of wear, so that the skid resistance when wet and the straight running stability are insufficient. I was

【0005】ブロックタイヤは、摩耗末期までタイヤ赤
道面付近に溝があるため、摩耗末期のカット外観に問題
がある。
[0005] Block tires have a problem in the cut appearance at the end of wear because there are grooves near the equatorial plane of the tire until the end of wear.

【0006】また、リブタイヤは、摩耗末期までタイヤ
赤道面付近に溝があるため、摩耗末期のカット外観に問
題があり、また、ラグ溝がないため、トラクション性が
不足していた。
Further, rib tires have a groove near the equatorial plane of the tire until the end of wear, so there is a problem in the cut appearance at the end of wear, and lack of lug grooves has led to a lack of traction.

【0007】本発明は、特に悪路にて使用された場合の
摩耗末期でのウエット時耐横滑り性、トラクション性、
カット外観を満足できる空気入りタイヤを提供すること
が目的である。
[0007] The present invention provides a skid resistance, traction property when wet, especially at the end of wear when used on a rough road.
It is an object to provide a pneumatic tire that can satisfy a cut appearance.

【0008】[0008]

【課題を解決するための手段】摩耗末期において十分な
耐カット性、ウエット時耐横滑り性及びトラクション性
を発揮するために発明者が種々の調査、実験、検討を重
ねた結果、以下のことが判明した。
Means for Solving the Problems The inventor has conducted various investigations, experiments, and studies in order to exhibit sufficient cut resistance, wet skid resistance and traction at the end of wear, and as a result, the following has been found. found.

【0009】図13のグラフに示すように、従来タイヤ
において悪路走行におけるカットの受傷数をトレッド幅
方向分布で見ると、タイヤ赤道面を中心に両側にそれぞ
れ0.15TW(ここで、TWはトレッド幅)の範囲
(図13のグラフの斜線部分)に、約80%のカットが
分布していた。このため、この範囲に摩耗末期に溝が存
在すると、そこにカットをより受け易くなるため、カッ
ト故障につながる。即ち、カット故障を低減するには、
摩耗末期にこの範囲に溝が無いことが望ましいことが分
かった。
As shown in the graph of FIG. 13, when the number of cuts injured on a rough road in the conventional tire is viewed in the tread width direction distribution, the number of cuts on both sides of the tire equatorial plane is 0.15 TW (where TW is About 80% of the cuts were distributed in the range of the tread width (the hatched portion in the graph of FIG. 13). For this reason, if a groove exists in this range at the end of wear, the groove is more likely to be cut there, leading to a cut failure. That is, to reduce cut failures,
It has been found that it is desirable that there be no grooves in this range at the end of wear.

【0010】ウエット時耐横滑り性においては、周方向
溝による周方向エッジが重要である。そこで、周方向溝
の位置とウエット時耐横滑り性との関係を調べるために
実車走行試験を行った。タイヤ赤道面からの周方向溝の
位置が異なる空気入りラジアルタイヤ(タイヤサイズ:
10.00R20−14プライ)を複数個試作し、2D
Dのダンプカーに装着し、水深1.0mmのテストコース
を旋回半径R=26.5mで走行し、旋回限界Gを測定
した。試験結果は図14のグラフに示すように、タイヤ
踏面内における周方向溝位置は、タイヤ赤道面から両側
にそれぞれ0.4TWの位置までは大きな旋回限界Gを
得ることができ、十分なウエット時耐横滑り性を発揮す
ることが分かった。
[0010] In the wet skid resistance, the circumferential edge formed by the circumferential groove is important. Therefore, in order to examine the relationship between the position of the circumferential groove and the skid resistance under wet conditions, an actual vehicle running test was performed. Pneumatic radial tires with different circumferential groove positions from the tire equatorial plane (tire size:
10.00R20-14 plies) and 2D
The vehicle was mounted on a dump truck D and traveled on a test course having a water depth of 1.0 mm with a turning radius R of 26.5 m, and a turning limit G was measured. As shown in the graph of FIG. 14, the test results show that the circumferential groove position in the tire tread can obtain a large turning limit G from the equatorial plane of the tire up to the position of 0.4 TW on each side, and that when sufficient wet It was found that the skid resistance was exhibited.

【0011】一方、トラクション性においては、ラグ溝
が重要である。そこで、ラグ溝の長さとトラクションと
の関係を調べるために実車走行試験を行った。ラグ溝の
長さが異なる空気入りラジアルタイヤ(タイヤサイズ:
10.00R20−14プライ)を複数個試作し、2D
Dのダンプカーに装着して泥ねい地を走行し、泥ねい地
内トラクション(泥ねい地内で発進する時のスリップ直
前の最大軸トルク)を測定した。
On the other hand, lug grooves are important for traction. Therefore, in order to investigate the relationship between the length of the lug groove and the traction, an actual vehicle running test was performed. Pneumatic radial tires with different lug lengths (tire size:
10.00R20-14 plies) and 2D
The vehicle was mounted on the dump truck D and traveled on muddy ground, and traction in muddy ground (maximum shaft torque immediately before slipping when starting in the muddy ground) was measured.

【0012】試験結果は図15のグラフに示すように、
ショルダー端100に開放するラグ溝102の先端位置
が、タイヤ赤道面センターライン(以下CLという)か
ら0.4TWの位置まで摩耗末期に延びていれば、摩耗
末期まで実用的に十分なトラクションが得られることが
分かった。
The test results are shown in the graph of FIG.
If the tip of the lug groove 102 opening to the shoulder end 100 extends from the tire equatorial plane center line (hereinafter referred to as CL) to the position of 0.4 TW at the end of wear, practically sufficient traction is obtained until the end of wear. I knew it could be done.

【0013】請求項1に記載の発明は上記事実に鑑みて
なされたものであって、トレッドに複数の周方向溝及び
ラグ溝を有する空気入りタイヤであって、トレッド幅を
TWとしたときに、タイヤ赤道面からタイヤ幅方向両側
へ各々0.15TW〜0.40TWの範囲内に形成され
摩耗末期において溝深さを有する周方向溝と、前記周方
向溝とショルダー端とを連結し摩耗末期において溝深さ
を有するラグ溝と、を有し、摩耗末期の前記トレッドに
は、タイヤ赤道面からタイヤ幅方向両側へ各々0.15
TWの範囲内に何れの溝も存在しないことを特徴として
いる。
The invention described in claim 1 has been made in view of the above fact, and is a pneumatic tire having a plurality of circumferential grooves and lug grooves in a tread, wherein a tread width is TW. A circumferential groove formed in a range of 0.15 TW to 0.40 TW from the tire equatorial plane to both sides in the tire width direction and having a groove depth at the end of wear, and connecting the circumferential groove and a shoulder end to end of wear. A lug groove having a groove depth at the end of wear, wherein the tread is 0.15 each from the tire equatorial plane to both sides in the tire width direction.
It is characterized in that no groove exists in the range of TW.

【0014】ここで、摩耗末期とは、ウエアインジケー
タが備えられている溝において、残溝が2.0乃至1.
6mmの範囲であることをいう。ウエアインジケータの厚
みは通常1.6mmであるからである。
The term "end of wear" means that the remaining grooves are 2.0 to 1.
It means that it is in the range of 6 mm. This is because the thickness of the wear indicator is usually 1.6 mm.

【0015】次に請求項1に記載の空気入りタイヤの作
用を説明する。タイヤ赤道面から両側にそれぞれ0.1
5TW〜0.4TWの範囲内に、摩耗末期において溝深
さを有する周方向溝を配置したので、周方向溝の周方向
エッジ効果を発揮でき、十分なウエット時耐横滑り性を
発揮することができる。
Next, the operation of the pneumatic tire according to the first aspect will be described. 0.1 on each side from the tire equatorial plane
In the range of 5 TW to 0.4 TW, since the circumferential groove having the groove depth at the end of wear is arranged, the circumferential edge effect of the circumferential groove can be exerted, and sufficient side slip resistance when wet can be exhibited. it can.

【0016】また、摩耗末期までラグ溝がショルダー位
置に残るので、摩耗末期まで十分なトラクション性が得
られる。
Further, since the lug groove remains at the shoulder position until the end of wear, sufficient traction can be obtained until the end of wear.

【0017】さらに、タイヤ赤道面を中心に両側にそれ
ぞれ0.15TW、計0.3TWの溝底カットの生じ易
い領域には、摩耗末期に周方向溝、ラグ溝の何れの溝も
存在しない。したがって、摩耗末期における溝底カット
の問題が解消される。
Further, in a region where a groove bottom cut of 0.15 TW and a total of 0.3 TW is easily generated on both sides of the tire equatorial plane as a center, neither the circumferential groove nor the lug groove is present at the end of wear. Therefore, the problem of groove bottom cut at the end of wear is eliminated.

【0018】また、請求項2に記載の発明は、請求項1
に記載の空気入りタイヤにおいて、前記トレッドには、
タイヤ赤道面からタイヤ幅方向両側へ各々0.15TW
の範囲内に、摩耗末期に消滅する周方向溝及びラグ溝の
少なくとも一方が形成されていることを特徴としてい
る。
The invention described in claim 2 is the same as the invention described in claim 1.
In the pneumatic tire according to, the tread,
0.15 TW from the equatorial plane of the tire to both sides in the tire width direction
In the range, at least one of the circumferential groove and the lug groove which disappear at the end of wear is formed.

【0019】次に請求項2に記載の空気入りタイヤの作
用を説明する。摩耗末期以前には、タイヤ赤道面を中心
に両側にそれぞれ0.15TW、計0.3TWの領域に
は、周方向溝及びラグ溝の少なくとも一方が形成されて
おり、摩耗末期以前においてウエット時耐横滑り性及び
トラクション性の少なくとも一方の性能を向上すること
ができる。
Next, the operation of the pneumatic tire according to claim 2 will be described. Before the end of wear, at least one of a circumferential groove and a lug groove is formed in a region of 0.15 TW on both sides of the tire equatorial plane and a total of 0.3 TW. The performance of at least one of sideslip and traction can be improved.

【0020】[0020]

【発明の実施の形態】本発明の空気入りタイヤの一実施
形態を図1及び図2にしたがって説明する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the pneumatic tire of the present invention will be described with reference to FIGS.

【0021】図1(A),(B)に示すように、本実施
形態の空気入りタイヤ10のトレッド12には、タイヤ
赤道面CL上にジグザグ状に延びるセンター側周方向溝
14が形成されており、その両側には、ジグザグ状に延
びるショルダー側周方向溝16が形成されている。
As shown in FIGS. 1A and 1B, the tread 12 of the pneumatic tire 10 of the present embodiment is formed with a center-side circumferential groove 14 extending in a zigzag manner on the tire equatorial plane CL. On both sides thereof, shoulder-side circumferential grooves 16 extending in a zigzag shape are formed.

【0022】ここで、トレッド幅をTWとした時に、シ
ョルダー側周方向溝16のタイヤ赤道面CL側の折曲頂
部16Aがタイヤ赤道面CLからタイヤ幅方向外側へ
0.17TW離れた位置にあり、タイヤ幅方向外側の折
曲頂部16Bがタイヤ赤道面CLからタイヤ幅方向外側
へ0.3TW離れた位置にある。
Here, when the tread width is TW, the bent top 16A of the shoulder side circumferential groove 16 on the tire equatorial plane CL side is located 0.17 TW away from the tire equatorial plane CL outward in the tire width direction. The bent top portion 16B on the outer side in the tire width direction is located at a position 0.3 TW away from the tire equatorial plane CL toward the outer side in the tire width direction.

【0023】さらに、トレッド12には、センター側周
方向溝14とショルダー側周方向溝16とを連結するセ
ンター側ラグ溝18が形成されていると共に、一方がシ
ョルダー側周方向溝16に連結され他端がショルダー端
20へ開口するショルダー側ラグ溝22が形成されてい
る。
Further, the tread 12 is formed with a center lug groove 18 for connecting the center side circumferential groove 14 and the shoulder side circumferential groove 16, and one of the center lug grooves 18 is connected to the shoulder side circumferential groove 16. A shoulder-side lug groove 22 whose other end is open to the shoulder end 20 is formed.

【0024】ショルダー側周方向溝16の溝深さとショ
ルダー側ラグ溝22の溝深さとは略同一であり、センタ
ー側周方向溝14の溝深さとセンター側ラグ溝18の溝
深さとは略同一である。
The groove depth of the shoulder side circumferential groove 16 and the groove depth of the shoulder side lug groove 22 are substantially the same, and the groove depth of the center side circumferential groove 14 and the groove depth of the center side lug groove 18 are substantially the same. It is.

【0025】また、センター側周方向溝14及びセンタ
ー側ラグ溝18は、ショルダー側周方向溝16及びショ
ルダー側ラグ溝22よりも溝深さが浅く設定されてお
り、トレッド12が摩耗してショルダー側周方向溝16
の溝深さ及びショルダー側ラグ溝22の溝深さが残り2
mmになった時点では、センター側周方向溝14及びセン
ター側ラグ溝18は完全に消滅するようになっている。
The center-side circumferential groove 14 and the center-side lug groove 18 are set to be shallower than the shoulder-side circumferential groove 16 and the shoulder-side lug groove 22. Side circumferential groove 16
And the groove depth of the shoulder-side lug groove 22 are remaining 2
At the time when the distance becomes mm, the center-side circumferential groove 14 and the center-side lug groove 18 are completely disappeared.

【0026】ここで、本実施形態の空気入りタイヤ10
の各部の寸法は、以下の表1に記載されている通りであ
る。
Here, the pneumatic tire 10 of the present embodiment
Are as described in Table 1 below.

【0027】[0027]

【表1】 [Table 1]

【0028】次に、本実施形態の空気入りタイヤ10の
作用を説明する。この空気入りタイヤ10の新品時〜摩
耗中期では、センター側周方向溝14及びショルダー側
周方向溝16によってウエット時耐横滑り性が得られ、
センター側ラグ溝18及びショルダー側ラグ溝22によ
ってトラクション性が得られる。
Next, the operation of the pneumatic tire 10 of the present embodiment will be described. When the pneumatic tire 10 is new to middle wear, the center-side circumferential groove 14 and the shoulder-side circumferential groove 16 provide wet skid resistance,
Traction is obtained by the center-side lug groove 18 and the shoulder-side lug groove 22.

【0029】摩耗末期になると、図2に示すように、ト
レッド12にはショルダー側周方向溝16及びショルダ
ー側ラグ溝22が残る。
At the end of wear, as shown in FIG. 2, a shoulder-side circumferential groove 16 and a shoulder-side lug groove 22 remain in the tread 12.

【0030】摩耗末期では、この空気入りタイヤ10は
ショルダー側周方向溝16の周方向エッジ効果によって
十分なウエット時耐横滑り性が得られる。
In the last stage of wear, the pneumatic tire 10 can obtain sufficient wet skid resistance due to the circumferential edge effect of the shoulder-side circumferential groove 16.

【0031】また、ショルダー端からタイヤ赤道面CL
側へ延びるショルダー側ラグ溝22が摩耗末期まで残る
ので、この空気入りタイヤ10は摩耗末期においても十
分なトラクション性が得られる。
Further, the tire equatorial plane CL is measured from the shoulder end.
Since the shoulder-side lug grooves 22 extending to the side remain until the end of wear, the pneumatic tire 10 can obtain sufficient traction even at the end of wear.

【0032】さらに、トレッド12のタイヤ赤道面CL
からタイヤ幅方向両側にそれぞれ0.15TWまでのカ
ットの生じやすい領域に配置したセンター側周方向溝1
4及びセンター側ラグ溝18が摩耗末期に消滅するの
で、この空気入りタイヤ10は摩耗末期における溝底の
カットが防止される。 (試験例)本発明の効果を確かめるために、本発明の適
用された実施例タイヤと比較例タイヤ2種を用意し、摩
耗末期(残溝2mm時点)におけるカット数、ウエット時
耐横滑り性及びトラクション性の比較を行った。
Further, the tire equatorial plane CL of the tread 12
Center-side circumferential grooves 1 arranged in areas where the cut is likely to occur up to 0.15 TW on each side of the tire width direction
Since the pneumatic tire 10 and the center side lug groove 18 disappear at the end of wear, cutting of the groove bottom at the end of wear is prevented. (Test Example) In order to confirm the effect of the present invention, two tires of the present invention and two tires of the comparative example were prepared. The number of cuts at the end of wear (at the time of the remaining groove of 2 mm), the side slip resistance when wet, and The traction properties were compared.

【0033】以下に試験タイヤを説明する。 実施例タイヤ:前述した実施形態の空気入りタイヤ(図
1及び図2参照)である。 比較例タイヤ1:新品時には、図3(A),(B)に示
すようにショルダー側ラグ溝30と、タイヤ赤道面CL
上とその両側の合計3本の周方向溝32があり、摩耗末
期では図4に示すように周方向溝32のみが残る空気入
りタイヤである。なお、トレッド幅をTWとした時に、
タイヤ赤道面CL両側の周方向溝32は、タイヤ赤道面
CL側の折曲頂部32Aがタイヤ赤道面CLからタイヤ
幅方向外側へ0.17TW離れた位置にあり、タイヤ幅
方向外側の折曲頂部32Bがタイヤ赤道面CLからタイ
ヤ幅方向外側へ0.30TW離れた位置にある。 比較例タイヤ2:新品時には図5(A),(B)に示す
ようにショルダー側ラグ溝34と、タイヤ赤道面CL両
側の周方向溝36があり、摩耗末期では図6に示すよう
にショルダー側ラグ溝34のみが残る空気入りタイヤで
ある。なお、トレッド幅をTWとした時に、ショルダー
側ラグ溝34の先端34Aの位置は、タイヤ赤道面CL
からタイヤ幅方向外側へ0.13TW離れた位置にあ
る。
The test tire will be described below. Example tire: The pneumatic tire of the embodiment described above (see FIGS. 1 and 2). Comparative Example Tire 1: When new, as shown in FIGS. 3A and 3B, the shoulder-side lug groove 30 and the tire equatorial plane CL
The pneumatic tire has a total of three circumferential grooves 32 on the upper side and on both sides, and at the end of wear, only the circumferential grooves 32 remain as shown in FIG. When the tread width is TW,
The circumferential groove 32 on both sides of the tire equatorial plane CL is such that the bent top 32A on the tire equatorial plane CL side is located 0.17 TW away from the tire equatorial plane CL in the tire width direction, and the bent top on the tire width direction outside. 32B is 0.30 TW away from the tire equatorial plane CL in the tire width direction. Comparative Example Tire 2: When new, there is a shoulder-side lug groove 34 and circumferential grooves 36 on both sides of the tire equatorial plane CL as shown in FIGS. 5A and 5B, and at the end of wear, as shown in FIG. This is a pneumatic tire in which only the side lug grooves 34 remain. When the tread width is TW, the position of the tip 34A of the shoulder-side lug groove 34 is determined by the tire equatorial plane CL.
Is located 0.13 TW away from the outside in the tire width direction.

【0034】なお、各試験タイヤ共にタイヤサイズは、
11R22.5−14プライである。 耐カット性:各試験タイヤの溝底部の目視し得るカット
の総数を数え、カット総数の逆数を、比較例タイヤ1を
100として指数表示した。指数が大きい程カット数が
少なく、耐カット性に優れていることを示す。 耐ウエット横滑り性:試験タイヤを2DDのダンプカー
に装着し、水深1.0mmのテストコースを旋回半径R=
26.5mで走行し、旋回限界Gを測定した。試験結果
は比較例タイヤ1を100とする指数表示であり、数値
が大きいほど旋回限界Gが大、即ち、耐ウエット横滑り
性に優れていることを示す。 トラクション:試験タイヤを2DDのダンプカーに装着
し、泥ねい地を走行し、泥ねい地内トラクション(泥ね
い地内で発進する時のスリップ直前の最大軸トルク)を
測定した。試験結果は比較例タイヤ1を100とする指
数表示であり、数値が大きいほどトラクションが大きい
ことを示す。
The tire size of each test tire is as follows:
11R22.5-14 plies. Cut resistance: The total number of visible cuts at the groove bottom of each test tire was counted, and the reciprocal of the total number of cuts was indicated as an index with the comparative tire 1 as 100. The larger the index, the smaller the number of cuts, indicating that the cut resistance is excellent. Wet skid resistance: A test tire was mounted on a 2DD dump truck, and a turning course R = 1.0 mm on a test course with a water depth of 1.0 mm.
The vehicle traveled at 26.5 m and the turning limit G was measured. The test results are expressed as an index with the comparative tire 1 being 100, and the larger the numerical value is, the larger the turning limit G is, that is, the more excellent the wet skid resistance is. Traction: The test tire was mounted on a 2DD dump truck, the vehicle was driven on a muddy ground, and traction in the muddy ground (maximum shaft torque immediately before slipping when starting in the muddy ground) was measured. The test results are indexed with the comparative tire 1 being 100, and the larger the value, the greater the traction.

【0035】ここで、試験タイヤの各部の寸法は以下の
表2に示す通りであり、各評価は以下の表3に示す通り
である。
Here, the dimensions of each part of the test tire are as shown in Table 2 below, and each evaluation is as shown in Table 3 below.

【0036】[0036]

【表2】 [Table 2]

【0037】[0037]

【表3】 [Table 3]

【0038】表3の結果に示すように、本発明の適用さ
れた実施例タイヤは、摩耗末期において、溝底カット、
耐ウエット横滑り性及びトラクションを満足できること
が分かる。
As shown in the results in Table 3, the tires according to the examples to which the present invention was applied showed that at the end of wear, the groove bottom cut,
It turns out that wet side slip resistance and traction can be satisfied.

【0039】なお、空気入りタイヤのトレッドパターン
は本発明の要旨を逸脱しない限り種々の変更が可能であ
る。
Various changes can be made to the tread pattern of the pneumatic tire without departing from the gist of the present invention.

【0040】例えば、新品時には図7(A),(B)に
示すようにタイヤ赤道面CLの両側に配置される合計2
本の周方向溝40と、この周方向溝40とショルダー端
とを連結するラグ溝42とを有し、摩耗末期においても
図8に示すように周方向溝40とラグ溝42とが残るパ
ターンでも良く、新品時には図9(A),(B)に示す
ようにタイヤ赤道面CL上の周方向溝43とタイヤ赤道
面CLの両側に配置される周方向溝44と、周方向溝4
4とショルダー端20とを連結するラグ溝46とを有
し、摩耗末期においては図10に示すように周方向溝4
4とラグ溝46とが残るパターンでも良く、新品時には
図11(A),(B)に示すようにタイヤ赤道面CLの
両側に配置される周方向溝48と、この周方向溝48の
外側に配置される周方向溝50と、周方向溝48と周方
向溝48とを連結するラグ溝52、周方向溝48と周方
向溝50とを連結するラグ溝54、周方向溝50とショ
ルダー端20とを連結する傾斜したラグ溝56とを有
し、摩耗末期においては図12に示すように周方向溝5
0とラグ溝56とが残るパターンでも良い。
For example, when a new product is used, a total of two tires arranged on both sides of the tire equatorial plane CL as shown in FIGS.
A pattern having a circumferential groove 40 and a lug groove 42 connecting the circumferential groove 40 and the shoulder end, and the circumferential groove 40 and the lug groove 42 remain even at the end of wear as shown in FIG. When a new product is used, the circumferential grooves 43 on the tire equatorial plane CL, the circumferential grooves 44 arranged on both sides of the tire equatorial plane CL, and the circumferential grooves 4 as shown in FIGS. 9A and 9B.
And a lug groove 46 connecting the shoulder end 20 to the shoulder end 20. At the end of wear, as shown in FIG.
4 and the lug groove 46 may be left. When the product is new, the circumferential groove 48 is disposed on both sides of the tire equatorial plane CL as shown in FIGS. , A lug groove 52 connecting the circumferential groove 48 and the circumferential groove 48, a lug groove 54 connecting the circumferential groove 48 and the circumferential groove 50, a circumferential groove 50 and the shoulder At the end of wear, the circumferential groove 5 is provided as shown in FIG.
A pattern in which 0 and the lug groove 56 remain may be used.

【0041】[0041]

【発明の効果】以上説明したように、請求項1に記載の
空気入りタイヤは上記の構成としたので、摩耗末期にお
いて、ウエット時耐横滑り性、トラクション性、カット
外観の全てを満足することができる、という優れた効果
を有する。
As described above, the pneumatic tire according to the first aspect has the above-described structure, so that it can satisfy all of the anti-skid properties when wet, traction properties, and cut appearance at the end of wear. It has an excellent effect of being able to.

【0042】また、請求項2に記載の空気入りタイヤは
上記の構成としたので、摩耗末期以前において、ウエッ
ト時耐横滑り性及びトラクション性の少なくとも一方の
性能を向上することができる、という優れた効果を有す
る。
Further, the pneumatic tire according to claim 2 has the above-mentioned structure, and therefore, it is possible to improve at least one of the anti-wet sideslip resistance and the traction property before the end of wear. Has an effect.

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

【図1】(A)は本発明の一実施形態に係る空気入りタ
イヤのトレッドの平面図であり、(B)は図1(A)の
1(B)−1(B)線断面図であり、(C)は図1
(A)の1(C)−1(C)線断面図である。
FIG. 1A is a plan view of a tread of a pneumatic tire according to an embodiment of the present invention, and FIG. 1B is a cross-sectional view taken along line 1 (B) -1 (B) of FIG. 1A. Yes, (C) Fig. 1
FIG. 2A is a cross-sectional view taken along line 1 (C) -1 (C).

【図2】図1に示すトレッドの摩耗末期の平面図であ
る。
FIG. 2 is a plan view of the tread shown in FIG. 1 at the end of wear.

【図3】(A)は試験に用いた比較例タイヤ1のトレッ
ドの平面図であり、(B)は図3(A)の3(B)−3
(B)線断面図である。
3A is a plan view of a tread of a comparative tire 1 used in the test, and FIG. 3B is a view 3 (B) -3 of FIG. 3A.
(B) It is a sectional view taken on a line.

【図4】図3に示すトレッドの摩耗末期の平面図であ
る。
FIG. 4 is a plan view of the tread shown in FIG. 3 at the end of wear.

【図5】(A)は試験に用いた比較例タイヤ2のトレッ
ドの平面図であり、(B)は図5(A)の5(B)−5
(B)線断面図である。
5A is a plan view of a tread of Comparative Example Tire 2 used for the test, and FIG. 5B is a view 5 (B) -5 of FIG. 5A.
(B) It is a sectional view taken on a line.

【図6】図5に示すトレッドの摩耗末期の平面図であ
る。
6 is a plan view of the tread shown in FIG. 5 at the end of wear.

【図7】(A)は本発明の他の実施形態に係る空気入り
タイヤのトレッドの平面図であり、(B)は図7(A)
の7(B)−7(B)線断面図である。
7A is a plan view of a tread of a pneumatic tire according to another embodiment of the present invention, and FIG. 7B is a plan view of FIG.
FIG. 7B is a sectional view taken along line 7 (B) -7 (B).

【図8】図7に示すトレッドの摩耗末期の平面図であ
る。
8 is a plan view of the tread shown in FIG. 7 at the end of wear.

【図9】(A)は本発明の更に他の実施形態に係る空気
入りタイヤのトレッドの平面図であり、(B)は図9
(A)の9(B)−9(B)線断面図である。
9A is a plan view of a tread of a pneumatic tire according to still another embodiment of the present invention, and FIG. 9B is a plan view of FIG.
It is a 9 (B) -9 (B) sectional view taken on the line of (A).

【図10】図9に示すトレッドの摩耗末期の平面図であ
る。
FIG. 10 is a plan view of the tread shown in FIG. 9 at the end of wear.

【図11】(A)は本発明の更に他の実施形態に係る空
気入りタイヤのトレッドの平面図であり、(B)は図1
1(A)の11(B)−11(B)線断面図である。
11A is a plan view of a tread of a pneumatic tire according to still another embodiment of the present invention, and FIG. 11B is a plan view of FIG.
FIG. 11 is a sectional view taken along line 11 (B) -11 (B) of FIG.

【図12】図11に示すトレッドの摩耗末期の平面図で
ある。
12 is a plan view of the tread shown in FIG. 11 at the end of wear.

【図13】周方向溝の位置と溝底カット数との関係を示
すグラフである。
FIG. 13 is a graph showing the relationship between the position of a circumferential groove and the number of groove bottom cuts.

【図14】周方向溝の位置とウエット時旋回Gとの関係
を示すグラフである。
FIG. 14 is a graph showing a relationship between a position of a circumferential groove and a turning G in a wet state.

【図15】ラグ溝端の位置と泥ねい地内トラクションと
の関係を示すグラフである。
FIG. 15 is a graph showing the relationship between the position of the lug groove end and traction in muddy ground.

【符号の説明】[Explanation of symbols]

10 空気入りタイヤ 12 トレッド 16 ショルダー側周方向溝 22 ショルダー側ラグ溝 40 周方向溝 42 ラグ溝 44 周方向溝 46 ラグ溝 50 周方向溝 56 ラグ溝 DESCRIPTION OF SYMBOLS 10 Pneumatic tire 12 Tread 16 Shoulder-side circumferential groove 22 Shoulder-side lug groove 40 Circumferential groove 42 Lug groove 44 Circumferential groove 46 Lug groove 50 Circumferential groove 56 Rug groove

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 トレッドに複数の周方向溝及びラグ溝を
有する空気入りタイヤであって、 トレッド幅をTWとしたときに、タイヤ赤道面からタイ
ヤ幅方向両側へ各々0.15TW〜0.40TWの範囲
内に形成され摩耗末期において溝深さを有する周方向溝
と、 前記周方向溝とショルダー端とを連結し摩耗末期におい
て溝深さを有するラグ溝と、を有し、 摩耗末期の前記トレッドには、タイヤ赤道面からタイヤ
幅方向両側へ各々0.15TWの範囲内に何れの溝も存
在しないことを特徴とする空気入りタイヤ。
1. A pneumatic tire having a plurality of circumferential grooves and lug grooves in a tread, wherein when the tread width is TW, 0.15 TW to 0.40 TW from the tire equatorial plane to both sides in the tire width direction. A circumferential groove having a groove depth formed at the end of wear and having a groove depth at the end of wear, and a lug groove connecting the circumferential groove and the shoulder end and having a groove depth at the end of wear. A pneumatic tire characterized in that the tread does not have any grooves within a range of 0.15 TW from the tire equatorial plane to both sides in the tire width direction.
【請求項2】 前記トレッドには、タイヤ赤道面からタ
イヤ幅方向両側へ各々0.15TWの範囲内に、摩耗末
期に消滅する周方向溝及びラグ溝の少なくとも一方が形
成されていることを特徴とする請求項1に記載の空気入
りタイヤ。
2. The tread has at least one of a circumferential groove and a lug groove which disappear at the end of wear in a range of 0.15 TW from the tire equatorial plane to both sides in the tire width direction. The pneumatic tire according to claim 1, wherein
JP19017297A 1997-07-15 1997-07-15 Pneumatic tire Expired - Lifetime JP3833785B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19017297A JP3833785B2 (en) 1997-07-15 1997-07-15 Pneumatic tire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19017297A JP3833785B2 (en) 1997-07-15 1997-07-15 Pneumatic tire

Publications (2)

Publication Number Publication Date
JPH1134615A true JPH1134615A (en) 1999-02-09
JP3833785B2 JP3833785B2 (en) 2006-10-18

Family

ID=16253645

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19017297A Expired - Lifetime JP3833785B2 (en) 1997-07-15 1997-07-15 Pneumatic tire

Country Status (1)

Country Link
JP (1) JP3833785B2 (en)

Cited By (16)

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JP2001347811A (en) * 2000-06-05 2001-12-18 Ohtsu Tire & Rubber Co Ltd :The Pneumatic tire
JP2002307913A (en) * 2001-04-09 2002-10-23 Sumitomo Rubber Ind Ltd Pneumatic tire
WO2007018009A1 (en) * 2005-08-08 2007-02-15 Bridgestone Corporation Tire for construction vehicle
JP2007145242A (en) * 2005-11-29 2007-06-14 Bridgestone Corp Tire for construction vehicle
US20090000712A1 (en) * 2004-07-21 2009-01-01 Bridgestone Corporation Pneumatic Tire
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US20110005652A1 (en) * 2008-02-27 2011-01-13 Bridgestone Corporation Pneumatic tire
US7874332B2 (en) * 2004-06-23 2011-01-25 Bridgestone Corporation Pneumatic tire with tread gauge of 95 mm or more having circumferential thin grooves, crosswise thin grooves and sub-thin grooves being closed at time of tread contact of fixed load
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JP2015229395A (en) * 2014-06-04 2015-12-21 株式会社ブリヂストン Heavy-duty pneumatic tire
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US10029517B2 (en) * 2014-10-31 2018-07-24 The Yokohama Rubber Co., Ltd. Heavy-duty pneumatic tire
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001347811A (en) * 2000-06-05 2001-12-18 Ohtsu Tire & Rubber Co Ltd :The Pneumatic tire
JP4488593B2 (en) * 2000-06-05 2010-06-23 住友ゴム工業株式会社 Pneumatic tire
JP2002307913A (en) * 2001-04-09 2002-10-23 Sumitomo Rubber Ind Ltd Pneumatic tire
US7874332B2 (en) * 2004-06-23 2011-01-25 Bridgestone Corporation Pneumatic tire with tread gauge of 95 mm or more having circumferential thin grooves, crosswise thin grooves and sub-thin grooves being closed at time of tread contact of fixed load
US20090000712A1 (en) * 2004-07-21 2009-01-01 Bridgestone Corporation Pneumatic Tire
WO2007018009A1 (en) * 2005-08-08 2007-02-15 Bridgestone Corporation Tire for construction vehicle
JP4776622B2 (en) * 2005-08-08 2011-09-21 株式会社ブリヂストン Construction vehicle tires
JP2007145242A (en) * 2005-11-29 2007-06-14 Bridgestone Corp Tire for construction vehicle
US20110005649A1 (en) * 2007-12-10 2011-01-13 Bridgestone Corporation Pneumatic tire
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US8746304B2 (en) * 2007-12-10 2014-06-10 Bridgestone Corporation Pneumatic tire
EP2230102A4 (en) * 2007-12-10 2014-01-22 Bridgestone Corp Pneumatic tire
US20110005652A1 (en) * 2008-02-27 2011-01-13 Bridgestone Corporation Pneumatic tire
US9259973B2 (en) * 2008-02-27 2016-02-16 Bridgestone Corporation Heavy duty tire
JP2010052502A (en) * 2008-08-27 2010-03-11 Yokohama Rubber Co Ltd:The Pneumatic tire
JP2013086565A (en) * 2011-10-13 2013-05-13 Bridgestone Corp Pneumatic tire
US10245897B2 (en) 2011-10-13 2019-04-02 Bridgestone Corporation Pneumatic tire
JP2013241069A (en) * 2012-05-18 2013-12-05 Bridgestone Corp Pneumatic tire
US10688832B2 (en) 2012-05-18 2020-06-23 Bridgestone Corporation Pneumatic tire
JP5557943B1 (en) * 2013-04-09 2014-07-23 株式会社ブリヂストン Pneumatic tire
WO2014167859A1 (en) * 2013-04-09 2014-10-16 株式会社ブリヂストン Pneumatic tire
JP2015229395A (en) * 2014-06-04 2015-12-21 株式会社ブリヂストン Heavy-duty pneumatic tire
CN106536220A (en) * 2014-07-23 2017-03-22 横滨橡胶株式会社 Heavy duty pneumatic tire
US10071602B2 (en) * 2014-07-23 2018-09-11 The Yokohama Rubber Co., Ltd. Heavy duty pneumatic tire
CN106536220B (en) * 2014-07-23 2018-09-28 横滨橡胶株式会社 Heavy duty pneumatic vehicle tire
US10029517B2 (en) * 2014-10-31 2018-07-24 The Yokohama Rubber Co., Ltd. Heavy-duty pneumatic tire
US11312187B2 (en) * 2016-03-31 2022-04-26 The Yokohama Rubber Co., Ltd. Heavy-duty pneumatic tire

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