JP2004345433A - Pneumatic tire - Google Patents

Pneumatic tire Download PDF

Info

Publication number
JP2004345433A
JP2004345433A JP2003142943A JP2003142943A JP2004345433A JP 2004345433 A JP2004345433 A JP 2004345433A JP 2003142943 A JP2003142943 A JP 2003142943A JP 2003142943 A JP2003142943 A JP 2003142943A JP 2004345433 A JP2004345433 A JP 2004345433A
Authority
JP
Japan
Prior art keywords
tire
extending
sipe
circumferential direction
width direction
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
Application number
JP2003142943A
Other languages
Japanese (ja)
Inventor
Yuji Toomatsu
祐二 遠松
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yokohama Rubber Co Ltd
Original Assignee
Yokohama Rubber Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yokohama Rubber Co Ltd filed Critical Yokohama Rubber Co Ltd
Priority to JP2003142943A priority Critical patent/JP2004345433A/en
Publication of JP2004345433A publication Critical patent/JP2004345433A/en
Pending legal-status Critical Current

Links

Images

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
    • B60C11/12—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes
    • B60C11/1236—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern
    • B60C2011/1254—Tread patterns characterised by the use of narrow slits or incisions, e.g. sipes with special arrangements in the tread pattern with closed sipe, i.e. not extending to a groove

Landscapes

  • Tires In General (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pneumatic tire improved in water-absorption efficiency by a sipe during braking, and also improved in braking performance during driving on an ice and snow road. <P>SOLUTION: Main grooves 2 extending in a tire circumferential direction T and lateral grooves 3 extending in a tire width direction on a tread face 1 form a zoned block 4. Sipes 6 extending in the tire circumferential direction T is formed only in an area 4X at a kick-out side of the ground surface 4a of the block 4. Sipes 5 extending in the tire width direction are formed in an area 4Y positioned to the step-in side of the area 4X at the kick-out side. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、空気入りタイヤに関し、更に詳しくは、氷雪路における制動性能を改善するようにした空気入りタイヤに関する。
【０００２】
【従来の技術】
一般に、氷雪路で使用される空気入りタイヤは、トレッド面にタイヤ周方向に延在する主溝とタイヤ幅方向に延在する横溝により区画した各ブロックの接地表面にタイヤ幅方向に延在する複数のサイプを設け、該サイプのエッジ効果と水膜を除去する吸水効果により高い氷雪路走行性能を確保するようにしている（例えば、特許文献１参照）。
【０００３】
【特許文献１】
特開２００１−２７７８１７号公報（２頁、図３及び図４）
【０００４】
【発明が解決しようとする課題】
しかしながら、制動時にブロックの蹴り出し側端部に大きな応力が作用するため、蹴り出し側のサイプが大きく開き、そこに雪などが詰まってサイプが開いた状態になるため、吸水効果を十分に発揮できないという問題があった。
【０００５】
本発明は、制動時のサイプによる吸水効果を改善し、氷雪路走行時の制動性能を向上することが可能な空気入りタイヤを提供することにある。
【０００６】
【課題を解決するための手段】
上記目的を達成する本発明は、トレッド面にタイヤ周方向に延在する主溝とタイヤ幅方向に延在する横溝により区画したブロックを形成し、各ブロックの接地表面にタイヤ幅方向に延在する複数のサイプを設けた空気入りタイヤにおいて、前記タイヤ幅方向に延在するサイプを前記ブロックの接地表面の蹴り出し側の領域より踏み込み側に位置する領域に設け、タイヤ周方向に延在するサイプを前記蹴り出し側の領域にのみ設けたことを特徴とする。
【０００７】
このようにブロックの蹴り出し側の領域にタイヤ周方向に延在するサイプを設けることで、制動時にブロックの蹴り出し側端部に大きな応力が作用しても蹴り出し側のサイプを開き難くすることができるので、雪などが詰まってサイプが開いた状態になるのを防ぐことができる。そのため、高い吸水効果を得ることができ、それによって滑りの一因である水膜を除去してブロック接地表面の蹴り出し側の領域の接地性を向上すると共に、高いエッジ効果を発揮することができる。
【０００８】
タイヤ周方向に延在するサイプを蹴り出し側の領域にのみ設け、それ以外の領域にタイヤ幅方向に延びるサイプを配置するので、各サイプによる高い吸水効果とエッジ効果を発揮し、氷雪路における制動性能を向上することができる。
【０００９】
【発明の実施の形態】
以下、本発明の構成について添付の図面を参照しながら詳細に説明する。
【００１０】
図１は本発明の空気入りタイヤの一実施形態を示し、トレッド面１にはタイヤ周方向Ｔに沿って延在する複数の主溝２が設けられている。タイヤ幅方向に延在する横溝３がタイヤ周方向Ｔに沿って所定のピッチで配置され、これら主溝２と横溝３により区画された多数のブロック４が形成されている。
【００１１】
各ブロック４の接地表面４ａには、タイヤ幅方向に延在する複数のサイプ５とタイヤ周方向Ｔに延在する複数のサイプ６が設けられている。
【００１２】
タイヤ周方向Ｔに延在するサイプ６は、タイヤ幅方向に所定の間隔で接地表面４ａの蹴り出し側の領域４Ｘにのみ配置され、横溝３に連通せずに蹴り出し側端６ａをブロック４内に位置している。各サイプ６は、１つの屈曲部６ｂを有してタイヤ周方向Ｔに沿って延在している。
【００１３】
タイヤ幅方向に延在するサイプ５は、タイヤ周方向Ｔに所定の間隔で蹴り出し側の領域４Ｘより踏み込み側に位置する領域４Ｙにのみ設けられている。最も踏み込み側に位置するサイプ５Ａは、主溝２に連通せずにその両端がブロック４内に位置している。残りのサイプ５Ｂはその両端が主溝２に連通している。各サイプ５は、複数の屈曲部５ｚを有し、タイヤ幅方向にジグザグ状に延在している。
【００１４】
上述した本発明によれば、ブロック４の蹴り出し側の領域４Ｘにタイヤ周方向Ｔに延在するサイプ６を設けたので、制動時にブロック４の蹴り出し側端部に大きな応力が作用した際にサイプ６の開きを抑制することができる。そのため、雪などが詰まってサイプ６が開いた状態になるのを防ぐことができる結果、高い吸水効果を発揮し、それにより水膜を除去して路面に接地表面４ａの蹴り出し側の領域４Ｘの接地性を向上させると共に、高いエッジ効果を発揮することができる。
【００１５】
タイヤ周方向Ｔに延在するサイプ６を蹴り出し側の領域４Ｘにのみ配置し、それ以外の領域４Ｙにタイヤ幅方向に延びるサイプ５を配置したので、各サイプ５，６による高い吸水効果とエッジ効果を発揮することができ、従って、氷雪路走行時の制動性能を向上することが可能になる。
【００１６】
図２は、上述したサイプ６の他の例を示し、タイヤ幅方向に所定の間隔で設けたサイプ６の蹴り出し側端６ａをブロック内に位置させたサイプ６Ｍと横溝３に連通するサイプ６Ｎを交互に配置したものである。このような配置にしたサイプ６を蹴り出し側の領域４Ｘにのみ設けるようにしてもよい。なお、本発明で言う蹴り出し側の領域４Ｘとは、接地表面４ａの蹴り出し側端ａから接地表面４ａの周方向長さＬの４０％の位置までの領域である。
【００１７】
本発明において、タイヤ周方向Ｔに延在するサイプ６は、上記実施形態ではタイヤ周方向Ｔに沿って延在、即ち、タイヤ周方向Ｔに対して０°で延在する例を示したが、タイヤ周方向Ｔに対して０〜４５°の範囲で延在させることができる。４５°を超えると、サイプ６の開きを効果的に抑制することが難しくなる。
【００１８】
本発明は、特に氷雪路用空気入りタイヤに好ましく用いることができるが、それに限定されず、例えば、１年を通して使用されるオールシーズン用の空気入りタイヤなどにも好適に用いることができる。
【００１９】
【実施例】
タイヤサイズを１９５／６５Ｒ１５で共通にし、蹴り出し側の領域にのみタイヤ周方向に延在するサイプを設けた図１に示す構成の本発明タイヤ、本発明タイヤにおいて、踏み込み側端部にもタイヤ周方向に延在するサイプを設け、蹴り出し側と踏み込み側との間の中間領域にタイヤ幅方向に延在するサイプを配置した比較タイヤ、及び本発明タイヤにおいてタイヤ幅方向に延在するサイプのみを設けた従来タイヤをそれぞれ作製した。
【００２０】
これら各試験タイヤをリムサイズ６．５Ｊのリムに装着し、空気圧を２００ｋＰａ にして、排気量２０００ｃｃの後輪駆動車に取り付け、以下に示す方法により、制動性能の評価試験を行ったところ、表１に示す結果を得た。
制動性能
氷雪路テストコースにおいて、時速４０ｋｍ／ｈから制動を付与して停止するまでの走行距離を測定し、その結果を従来タイヤを１００とする指数値で評価した。この値が大きいほど、氷雪路における制動性能が優れている。
【００２１】
【表１】

Figure 2004345433
表１から、本発明タイヤは、氷雪路における制動性能を改善できることがわかる。
【００２２】
【発明の効果】
上述したように本発明は、ブロックの接地表面の蹴り出し側の領域にのみタイヤ周方向に延在するサイプを設け、蹴り出し側の領域より踏み込み側に位置する領域にはタイヤ幅方向に延在するサイプを設けたので、制動時のサイプによる吸水効果を改善し、氷雪路走行時の制動性能を向上することができる。
【図面の簡単な説明】
【図１】本発明の空気入りタイヤの一実施形態を示すトレッド面の要部展開図である。
【図２】タイヤ周方向に延在するサイプの他の例を示すブロックの拡大平面図である。
【符号の説明】
１ トレッド面 ２ 主溝
３ 横溝 ４ ブロック
４ａ 接地表面 ４Ｘ 蹴り出し側の領域
４Ｙ 踏み込み側に位置する領域 ５ サイプ
５ｚ 屈曲部 ６，６Ｍ，６Ｎ サイプ
６ａ 蹴り出し側端 ６ｂ 屈曲部
Ｔ タイヤ周方向[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a pneumatic tire, and more particularly, to a pneumatic tire with improved braking performance on icy and snowy roads.
[0002]
[Prior art]
Generally, a pneumatic tire used on an icy road extends in a tire width direction on a ground contact surface of each block defined by a main groove extending in a tire circumferential direction on a tread surface and a lateral groove extending in a tire width direction. A plurality of sipes are provided to ensure high running performance on icy and snowy roads by the edge effect of the sipes and the water absorbing effect of removing a water film (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP 2001-277817 A (Page 2, FIGS. 3 and 4)
[0004]
[Problems to be solved by the invention]
However, since a large stress acts on the kick-out side end of the block during braking, the sipe on the kick-out side opens greatly, and the sipe is clogged with snow and the like, causing the sipe to open, thus exhibiting a sufficient water absorption effect. There was a problem that could not be done.
[0005]
An object of the present invention is to provide a pneumatic tire capable of improving a water absorbing effect of a sipe during braking and improving braking performance when traveling on an icy road.
[0006]
[Means for Solving the Problems]
To achieve the above object, the present invention forms a block defined by a main groove extending in a tire circumferential direction and a lateral groove extending in a tire width direction on a tread surface, and extends in a tire width direction on a ground contact surface of each block. In the pneumatic tire provided with a plurality of sipes to be provided, the sipes extending in the tire width direction are provided in an area located on a stepping side from an area on a kick-out side of the ground contact surface of the block, and extend in a tire circumferential direction. The sipes are provided only in the region on the kick-out side.
[0007]
By providing the sipe extending in the tire circumferential direction in the region on the kick-out side of the block in this way, it is difficult to open the sipe on the kick-out side even if a large stress acts on the kick-out side end of the block during braking. It is possible to prevent the sipe from being opened due to snow or the like. Therefore, a high water-absorbing effect can be obtained, thereby removing a water film that is a cause of slippage, thereby improving a grounding property in a region on a kick-out side of the block grounding surface, and exhibiting a high edge effect. it can.
[0008]
Since the sipe extending in the tire circumferential direction is provided only in the area on the kick-out side, and the sipe extending in the tire width direction is arranged in the other area, it exerts a high water absorption effect and an edge effect by each sipe, and on ice and snow roads Braking performance can be improved.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings.
[0010]
FIG. 1 shows an embodiment of the pneumatic tire according to the present invention. A tread surface 1 is provided with a plurality of main grooves 2 extending along a tire circumferential direction T. The lateral grooves 3 extending in the tire width direction are arranged at a predetermined pitch along the tire circumferential direction T, and a large number of blocks 4 defined by the main grooves 2 and the lateral grooves 3 are formed.
[0011]
A plurality of sipes 5 extending in the tire width direction and a plurality of sipes 6 extending in the tire circumferential direction T are provided on the ground surface 4a of each block 4.
[0012]
The sipe 6 extending in the tire circumferential direction T is disposed only in a region 4X on the kick-out side of the ground contact surface 4a at a predetermined interval in the tire width direction, and blocks the kick-out side end 6a without communicating with the lateral groove 3. Located within. Each sipe 6 has one bent portion 6b and extends along the tire circumferential direction T.
[0013]
The sipes 5 extending in the tire width direction are provided at predetermined intervals in the tire circumferential direction T only in the region 4Y located on the stepping side from the region 4X on the kicking side. The sipe 5 </ b> A located on the most stepping side has both ends located in the block 4 without communicating with the main groove 2. The other ends of the sipe 5B communicate with the main groove 2 at both ends. Each sipe 5 has a plurality of bent portions 5z and extends in a zigzag shape in the tire width direction.
[0014]
According to the present invention described above, since the sipes 6 extending in the tire circumferential direction T are provided in the region 4X on the kick-out side of the block 4, when a large stress acts on the kick-out side end of the block 4 during braking. Therefore, the opening of the sipe 6 can be suppressed. As a result, it is possible to prevent the sipe 6 from being opened due to snow or the like, thereby exhibiting a high water absorption effect, thereby removing a water film and forming a region 4X on the road surface on the kick-out side of the ground surface 4a. And a high edge effect can be exhibited.
[0015]
Since the sipe 6 extending in the tire circumferential direction T is arranged only in the region 4X on the kicking-out side and the sipe 5 extending in the tire width direction is arranged in the other region 4Y, a high water absorbing effect by each sipe 5, 6 is achieved. An edge effect can be exerted, and therefore, it is possible to improve braking performance when traveling on ice and snowy roads.
[0016]
FIG. 2 shows another example of the sipe 6 described above, in which the sipe 6M provided at predetermined intervals in the tire width direction has a kick-out side end 6a located in the block and a sipe 6N communicating with the lateral groove 3. Are alternately arranged. The sipe 6 having such an arrangement may be provided only in the region 4X on the kick-out side. Note that the kick-out side area 4X referred to in the present invention is an area from the kick-out side end a of the ground surface 4a to a position 40% of the circumferential length L of the ground surface 4a.
[0017]
In the present invention, the example in which the sipe 6 extending in the tire circumferential direction T extends along the tire circumferential direction T in the above embodiment, that is, the sipe 6 extends at 0 ° with respect to the tire circumferential direction T has been described. , In the range of 0 to 45 ° with respect to the tire circumferential direction T. If the angle exceeds 45 °, it becomes difficult to effectively suppress the opening of the sipe 6.
[0018]
The present invention can be preferably used particularly for a pneumatic tire for snowy and snowy roads, but is not limited thereto. For example, it can be suitably used for an all-season pneumatic tire used throughout the year.
[0019]
【Example】
In the tire of the present invention having the tire size common to 195 / 65R15 and a sipe extending in the circumferential direction of the tire only in the area on the kick-out side, the tire of the present invention has a tire at the stepping-side end. A comparative tire in which a sipe extending in the circumferential direction is provided, and a sipe extending in the tire width direction is arranged in an intermediate region between the kicking side and the stepping side, and a sipe extending in the tire width direction in the tire of the present invention. Conventional tires provided only with these were manufactured.
[0020]
Each of the test tires was mounted on a rim having a rim size of 6.5 J, the air pressure was set to 200 kPa, and the tire was mounted on a rear-wheel drive vehicle with a displacement of 2000 cc. An evaluation test of braking performance was performed by the following method. Were obtained.
Braking Performance On an ice and snow road test course, the running distance from the speed of 40 km / h until braking was applied and stopped was measured, and the result was evaluated as an index value with the conventional tire being 100. The larger this value is, the better the braking performance on ice and snowy roads is.
[0021]
[Table 1]
Figure 2004345433
Table 1 shows that the tire of the present invention can improve braking performance on icy and snowy roads.
[0022]
【The invention's effect】
As described above, in the present invention, a sipe extending in the tire circumferential direction is provided only in a region on the kicking side of the ground contact surface of the block, and a sipe extending in the tire width direction is provided in a region located on the stepping side from the region on the kicking side. Since the existing sipe is provided, the water absorbing effect of the sipe at the time of braking can be improved, and the braking performance at the time of traveling on an icy road can be improved.
[Brief description of the drawings]
FIG. 1 is a development view of a main portion of a tread surface showing one embodiment of a pneumatic tire of the present invention.
FIG. 2 is an enlarged plan view of a block showing another example of a sipe extending in a tire circumferential direction.
[Explanation of symbols]
Reference Signs List 1 tread surface 2 main groove 3 lateral groove 4 block 4a ground surface 4X area on kick-out side 4Y area located on step-in side 5 sipes 5z bent part 6, 6M, 6N sipes 6a kick-out end 6b bent part T tire circumferential direction

Claims (6)

トレッド面にタイヤ周方向に延在する主溝とタイヤ幅方向に延在する横溝により区画したブロックを形成し、各ブロックの接地表面にタイヤ幅方向に延在する複数のサイプを設けた空気入りタイヤにおいて、
前記タイヤ幅方向に延在するサイプを前記ブロックの接地表面の蹴り出し側の領域より踏み込み側に位置する領域に設け、タイヤ周方向に延在するサイプを前記蹴り出し側の領域にのみ設けた空気入りタイヤ。A pneumatic pneumatic system in which a block defined by a main groove extending in the tire circumferential direction and a lateral groove extending in the tire width direction is formed on the tread surface, and a plurality of sipes extending in the tire width direction are provided on the grounding surface of each block. In the tire,
The sipe extending in the tire width direction was provided in an area located on the stepping side from the area on the kicking side of the ground contact surface of the block, and the sipe extending in the tire circumferential direction was provided only in the area on the kicking side. Pneumatic tire. 前記タイヤ周方向に延在するサイプがタイヤ周方向に対して０〜４５°の範囲で延在する請求項１に記載の空気入りタイヤ。The pneumatic tire according to claim 1, wherein the sipe extending in the tire circumferential direction extends in a range of 0 to 45 ° with respect to the tire circumferential direction. 前記タイヤ周方向に延在するサイプをタイヤ幅方向に所定の間隔で配置し、該サイプの蹴り出し側端をブロック内に位置させた請求項１または２に記載の空気入りタイヤ。The pneumatic tire according to claim 1 or 2, wherein the sipes extending in the tire circumferential direction are arranged at predetermined intervals in a tire width direction, and a kick-out side end of the sipes is located in the block. 前記タイヤ周方向に延在するサイプをタイヤ幅方向に所定の間隔で配置し、該サイプの蹴り出し側端をブロック内に位置させたサイプと前記横溝に連通するサイプを交互に配置した請求項１または２に記載の空気入りタイヤ。The sipe extending in the tire circumferential direction is arranged at predetermined intervals in the tire width direction, and a sipe in which a kick-out side end of the sipe is located in a block and a sipe communicating with the lateral groove are alternately arranged. 3. The pneumatic tire according to 1 or 2. 前記タイヤ周方向に延在するサイプ及び前記タイヤ幅方向に延在するサイプが屈曲部を有して延在する請求項１，２，３または４に記載の空気入りタイヤ。The pneumatic tire according to claim 1, 2, 3, or 4, wherein the sipe extending in the tire circumferential direction and the sipe extending in the tire width direction extend with a bent portion. 前記空気入りタイヤが氷雪路用空気入りタイヤである請求項１，２，３，４または５に記載の空気入りタイヤ。The pneumatic tire according to claim 1, 2, 3, 4, or 5, wherein the pneumatic tire is a pneumatic tire for icy and snowy roads.
JP2003142943A 2003-05-21 2003-05-21 Pneumatic tire Pending JP2004345433A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2003142943A JP2004345433A (en) 2003-05-21 2003-05-21 Pneumatic tire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003142943A JP2004345433A (en) 2003-05-21 2003-05-21 Pneumatic tire

Publications (1)

Publication Number Publication Date
JP2004345433A true JP2004345433A (en) 2004-12-09

Family

ID=33530859

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2003142943A Pending JP2004345433A (en) 2003-05-21 2003-05-21 Pneumatic tire

Country Status (1)

Country Link
JP (1) JP2004345433A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014015212A (en) * 2013-10-28 2014-01-30 Sumitomo Rubber Ind Ltd Pneumatic tire for heavy load
JPWO2014061514A1 (en) * 2012-10-17 2016-09-05 株式会社ブリヂストン Pneumatic tire
CN108349322A (en) * 2015-11-12 2018-07-31 株式会社普利司通 Tire
US10703143B2 (en) 2012-10-17 2020-07-07 Bridgestone Corporation Pneumatic tire
EP3715145A1 (en) * 2019-03-28 2020-09-30 Continental Reifen Deutschland GmbH Pneumatic tyre

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2014061514A1 (en) * 2012-10-17 2016-09-05 株式会社ブリヂストン Pneumatic tire
EP2910389B1 (en) * 2012-10-17 2018-12-19 Bridgestone Corporation Pneumatic tire
US10703143B2 (en) 2012-10-17 2020-07-07 Bridgestone Corporation Pneumatic tire
JP2014015212A (en) * 2013-10-28 2014-01-30 Sumitomo Rubber Ind Ltd Pneumatic tire for heavy load
CN108349322A (en) * 2015-11-12 2018-07-31 株式会社普利司通 Tire
CN108349322B (en) * 2015-11-12 2020-06-02 株式会社普利司通 Tyre for vehicle wheels
EP3715145A1 (en) * 2019-03-28 2020-09-30 Continental Reifen Deutschland GmbH Pneumatic tyre

Similar Documents

Publication Publication Date Title
JP3359000B2 (en) Pneumatic tire
JPH082215A (en) Pneumatic tire
JP2005126055A (en) Pneumatic tire
JP4056304B2 (en) Pneumatic tires for icy and snowy roads
JP4628151B2 (en) Pneumatic tire
JP2006240456A (en) Pneumatic tire
JP2004034903A (en) Pneumatic tire for ice or snow covered road
JP4518639B2 (en) Pneumatic tire
JP4776059B2 (en) Pneumatic tire and its mounting method
JP2006176055A (en) Pneumatic tire
JP2000219015A (en) Pneumatic tire
JP2005297695A (en) Pneumatic tire
JP3586045B2 (en) Studless pneumatic tires
JPH061119A (en) Pneumatic tire for iced and snowy road
EP2450201A1 (en) Pneumatic tire
JP2004345433A (en) Pneumatic tire
JP2008049971A (en) Pneumatic tire
JP2009018605A (en) Pneumatic tire
JPH1024707A (en) Pneumatic tire for ice/snow road
JPH08238911A (en) Penumatic tire suitable for traveling on icy and snowy road
JP2006143139A (en) Pneumatic tire
JP2004306906A (en) Pneumatic tire
JP4274296B2 (en) Pneumatic tire
JP2923795B2 (en) Pneumatic tires for icy and snowy roads
JP4205911B2 (en) Pneumatic tire

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20060322

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20081023

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20081028

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20090310