JP6754186B2 - Pneumatic tires - Google Patents

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JP6754186B2
JP6754186B2 JP2015242879A JP2015242879A JP6754186B2 JP 6754186 B2 JP6754186 B2 JP 6754186B2 JP 2015242879 A JP2015242879 A JP 2015242879A JP 2015242879 A JP2015242879 A JP 2015242879A JP 6754186 B2 JP6754186 B2 JP 6754186B2
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sipe
closed
groove
side wall
depth
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健介 尾藤
健介 尾藤
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Toyo Tire Corp
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Toyo Tire Corp
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本開示は、少なくとも一端が閉塞された閉塞溝をトレッド陸部に有する空気入りタイヤに関する。 The present disclosure relates to a pneumatic tire having a closed groove in the land portion of the tread with at least one end closed.

空気入りタイヤは、例えば特許文献１に示すように、タイヤ周方向に延びる主溝及び周方向に交差する横溝で区画されるトレッド陸部を有する。 As shown in Patent Document 1, for example, the pneumatic tire has a tread land portion defined by a main groove extending in the tire circumferential direction and a lateral groove intersecting in the circumferential direction.

特開２００７−３３１４１２号公報Japanese Unexamined Patent Publication No. 2007-331412

図５に示すように、トレッド陸部５０には、周方向ＰＤに交差する延在方向ＤＤ１に延び且つ一端が閉塞された閉塞溝６が形成されている場合がある。ゴムは非圧縮性であるため、接地によりトレッド陸部５０に荷重が作用すると、図５の下部に示すように、閉塞溝６の壁面の腹が押し出される。このような壁面の変形は、溝断面を閉塞させる動作であるため、溝内の空気が圧縮され、ノイズを引き起こす原因となる。例えば、閉塞溝が、一端が閉塞され他端が主溝に接続されるスリットである場合には、主溝に圧縮空気が押し出され、気柱共鳴音が招来されてしまう。また、例えば、閉塞溝が、両端が閉塞されるディンプルである場合には、トレッド陸部が路面から離れる際に、圧縮空気が一気に開放され、ノイズが招来されてしまう。 As shown in FIG. 5, the land portion 50 of the tread may be formed with a closed groove 6 extending in the extending direction DD1 intersecting the circumferential direction PD and having one end closed. Since the rubber is incompressible, when a load is applied to the land portion 50 of the tread by grounding, the antinode of the wall surface of the closing groove 6 is pushed out as shown in the lower part of FIG. Since such deformation of the wall surface is an operation of closing the cross section of the groove, the air in the groove is compressed, which causes noise. For example, when the closed groove is a slit in which one end is closed and the other end is connected to the main groove, compressed air is pushed out into the main groove, and an air column resonance sound is invited. Further, for example, when the blocking groove is a dimple that closes both ends, compressed air is released at once when the land portion of the tread separates from the road surface, and noise is introduced.

本開示は、このような課題に着目してなされたものであって、その目的は、閉塞溝の変形に起因するノイズを低減する空気入りタイヤを提供することである。 The present disclosure has focused on such a problem, and an object of the present disclosure is to provide a pneumatic tire that reduces noise caused by deformation of a closed groove.

本開示は、上記目的を達成するために、次のような手段を講じている。 The present disclosure takes the following measures to achieve the above object.

本開示の空気入りタイヤは、
トレッド陸部に、周方向に交差する延在方向に延び且つ少なくとも一端が閉塞された閉塞溝が形成されており、
前記閉塞溝の周方向両側壁のうち少なくとも一方の側壁の縁部に、サイプが連続的又は断続的に前記延在方向に延びており、
前記サイプの深さは、前記閉塞溝の深さの６０％以上の深さを有し、
前記サイプは、前記側壁からサイプ深さよりも短い範囲内に配置されている。 The pneumatic tires of this disclosure are
An obstruction groove extending in the extending direction intersecting the circumferential direction and having at least one end closed is formed in the land part of the tread.
A sipe extends continuously or intermittently in the extending direction at the edge of at least one side wall of the peripheral wall of the closed groove.
The depth of the sipe has a depth of 60% or more of the depth of the closed groove.
The sipe is arranged within a range shorter than the sipe depth from the side wall.

このように、閉塞溝の側壁の縁部に、閉塞溝の深さの６０％以上の深さを有するサイプが連続的又は断続的に閉塞溝の延在方向に延びており、側壁からサイプ深さよりも短い範囲内にサイプが配置されているので、陸部を変形させる力が作用した場合に、まずサイプが潰れ、閉塞溝の側壁に力が伝わりにくく又は伝わらず、閉塞溝の側壁の瞬間的な変形が抑制されるので、閉塞溝又は閉塞溝に連通する溝の空気圧縮が低減する。その結果、空気圧縮に起因するノイズを低減することが可能となる。 As described above, at the edge of the side wall of the closed groove, a sipe having a depth of 60% or more of the depth of the closed groove extends continuously or intermittently in the extending direction of the closed groove, and the sipe depth is extended from the side wall. Since the sipe is arranged within a shorter range, when a force that deforms the land is applied, the sipe first collapses, and the force is difficult or not transmitted to the side wall of the closed groove, and the moment of the side wall of the closed groove. Since the deformation is suppressed, the air compression of the closed groove or the groove communicating with the closed groove is reduced. As a result, it is possible to reduce noise caused by air compression.

本実施形態の空気入りタイヤのトレッドパターンを模式的に示す踏面図。The tread view which shows typically the tread pattern of the pneumatic tire of this embodiment. トレッドパターンの部分拡大図。Partially enlarged view of the tread pattern. 図２ＡのＡ１−Ａ１部位断面図。FIG. 2A is a cross-sectional view taken along the line A1-A1 of FIG. 2A. 変形例を示す図。The figure which shows the modification. 変形例を示す図。The figure which shows the modification. 変形例を示す図。The figure which shows the modification. 変形例を示す図。The figure which shows the modification. 変形例を示す図。The figure which shows the modification. 従来のトレッドパターン及びその動作説明に関する図。The figure regarding the conventional tread pattern and its operation explanation.

以下、本開示の一実施形態の空気入りタイヤについて、図面を参照して説明する。 Hereinafter, the pneumatic tire according to the embodiment of the present disclosure will be described with reference to the drawings.

図１に示すように、空気入りタイヤのトレッドは、複数の主溝５１および複数の横溝５２を有し、主溝５１と横溝５２でトレッド陸部５０が区画されている。トレッド陸部５０には、周方向ＰＤに交差する延在方向ＤＤ１に延びるスリットとも呼ばれる閉塞溝６が形成されている。なお、図１は説明用の図であり、抽象化しているので、寸法は正しくない。図１の例では、タイヤ幅方向ＷＤと閉塞溝６の延在方向ＤＤ１が一致している。 As shown in FIG. 1, the tread of a pneumatic tire has a plurality of main grooves 51 and a plurality of lateral grooves 52, and the tread land portion 50 is divided by the main groove 51 and the lateral grooves 52. The land portion 50 of the tread is formed with a closed groove 6 also called a slit extending in the extending direction DD1 intersecting the circumferential direction PD. Note that FIG. 1 is an explanatory diagram and is abstracted, so the dimensions are not correct. In the example of FIG. 1, the tire width direction WD and the extension direction DD1 of the closing groove 6 coincide with each other.

図２Ａに示すように、閉塞溝６は、一端が閉塞され他端が主溝５１に連通している。閉塞溝６の周方向両側壁６０の縁部に、サイプ７が連続的に延在方向ＤＤ１に延びている。本明細書において、サイプとは、幅が０．３ｍｍ以上且つ２．０ｍｍ以下の溝を意味する。本実施形態では、図２Ａに示すようにサイプ７は、平面視で直線状であるが、図３Ａに示すように、波状又はジグザグ状に延びていてもよい。また、図２Ａに示すようにサイプ７は連続的に延びた状態であるが、図３Ｂに示すように、サイプ７は、破線のように断続的に延びていてもよい。 As shown in FIG. 2A, one end of the closed groove 6 is closed and the other end communicates with the main groove 51. A sipe 7 continuously extends in the extending direction DD1 at the edge of both side walls 60 in the circumferential direction of the closing groove 6. In the present specification, the sipe means a groove having a width of 0.3 mm or more and 2.0 mm or less. In the present embodiment, the sipe 7 is linear in a plan view as shown in FIG. 2A, but may extend in a wavy or zigzag shape as shown in FIG. 3A. Further, as shown in FIG. 2A, the sipe 7 is in a continuously extended state, but as shown in FIG. 3B, the sipe 7 may be intermittently extended as shown by a broken line.

図２Ｂに示すように、サイプ７は、踏面Ｔに対して垂直にタイヤ径方向ＲＤに沿って延びている。サイプ７の深さｄは、閉塞溝６の深さＤの６０％以上の深さを有する。荷重がかかると閉塞溝６の中央から路面寄りの変形が大きいため、６０％未満よりもサイプ７が浅くなると、閉塞溝６の側壁６０の変形を抑える効果が発揮できないからである。なお、サイプ７の深さｄは、閉塞溝６の深さＤの１００％以下であることが好ましい。 As shown in FIG. 2B, the sipe 7 extends along the tire radial direction RD perpendicular to the tread surface T. The depth d of the sipe 7 has a depth of 60% or more of the depth D of the closed groove 6. This is because when a load is applied, the deformation from the center of the closed groove 6 toward the road surface is large, and if the sipe 7 is shallower than less than 60%, the effect of suppressing the deformation of the side wall 60 of the closed groove 6 cannot be exhibited. The depth d of the sipe 7 is preferably 100% or less of the depth D of the closed groove 6.

サイプ７は、側壁６０からサイプ深さｄよりも短い範囲内に配置されている。すなわち、サイプ７と側壁６０との間の距離Ｗは、１．５ｍｍ以上であり且つサイプ深さｄよりも短い。絶対的な数値として表現すれば、サイプ７と側壁６０との間の距離Ｗは、１．５ｍｍ以上且つ６．０ｍｍ以下が好ましい。サイプ７と側壁６０との間の距離Ｗが大きければ、サイプ７と閉塞溝６の間の陸部自体の変形が無視できないからである。サイプ７と側壁６０との間の距離Ｗが１．５ｍｍよりも小さすぎると、サイプ７と閉塞溝６の間の陸部が摩耗せずに残ってしまうからである。 The sipe 7 is arranged within a range shorter than the sipe depth d from the side wall 60. That is, the distance W between the sipe 7 and the side wall 60 is 1.5 mm or more and shorter than the sipe depth d. Expressed as an absolute numerical value, the distance W between the sipe 7 and the side wall 60 is preferably 1.5 mm or more and 6.0 mm or less. This is because if the distance W between the sipe 7 and the side wall 60 is large, the deformation of the land portion itself between the sipe 7 and the closed groove 6 cannot be ignored. This is because if the distance W between the sipe 7 and the side wall 60 is less than 1.5 mm, the land portion between the sipe 7 and the closed groove 6 remains without being worn.

本実施形態では、サイプ７は、側壁６０の全体に沿って延びており、陸部の端（主溝５１）に開放されている。勿論、サイプ７を陸部内部にて終端するようにしてもよい。また、サイプ７は、閉塞溝６の閉塞端６１に沿って配置され、閉塞溝６をコの字状（Ｕ字状）に包囲している。勿論、サイプ７は、側壁６０の全体に沿って延びていなくてもよい。サイプ７の延在方向ＤＤ１の合計長さＬ２が、側壁６０の延在方向ＤＤ１の長さＬ１の７０％以上であればよい。サイプ７の延在方向ＤＤ１の合計長さＬ２は、サイプ７が破線のように断続的な場合はサイプ７のみの合計長さであり、サイプ７が波状又はジグザグ状である場合には、延在方向ＤＤ１への投影長さである。本実施形態では、閉塞溝６の延在方向ＤＤ１の長さが閉塞溝６の幅よりも長いので、側壁６０の縁部に配置されるサイプ７がノイズ低減効果に支配的であると考えられる。 In the present embodiment, the sipe 7 extends along the entire side wall 60 and is open to the end of the land portion (main groove 51). Of course, the sipe 7 may be terminated inside the land portion. Further, the sipe 7 is arranged along the closed end 61 of the closed groove 6 and surrounds the closed groove 6 in a U shape (U shape). Of course, the sipe 7 does not have to extend along the entire side wall 60. The total length L2 of the extension direction DD1 of the sipe 7 may be 70% or more of the length L1 of the extension direction DD1 of the side wall 60. The total length L2 of the extending direction DD1 of the sipe 7 is the total length of only the sipe 7 when the sipe 7 is intermittent as shown by the broken line, and is extended when the sipe 7 is wavy or zigzag. It is the projection length on the DD1 in the direction. In the present embodiment, since the length of the extension direction DD1 of the obstruction groove 6 is longer than the width of the obstruction groove 6, it is considered that the sipes 7 arranged at the edge of the side wall 60 dominates the noise reduction effect. ..

なお、本実施形態では、閉塞端６１に沿ってサイプ７を配置しているが、図３Ａ、図３Ｂ、図４Ａ、及び図４Ｂに示すように、閉塞端６１に沿ってサイプ７を配置しなくてもよい。本実施形態では、双方の側壁６０に沿ってサイプ７を配置しているが、図４Ｂ及び図４Ｃに示すように、一方の側壁６０のみに沿ってサイプ７を配置するようにしてもよい。これらは、図２Ａの例に比べてノイズ低減効果が減少するが、少なくともサイプ７を形成して場合よりもノイズ低減効果を有する。 In the present embodiment, the sipe 7 is arranged along the closed end 61, but as shown in FIGS. 3A, 3B, 4A, and 4B, the sipe 7 is arranged along the closed end 61. It does not have to be. In the present embodiment, the sipe 7 is arranged along both side walls 60, but as shown in FIGS. 4B and 4C, the sipe 7 may be arranged along only one side wall 60. These have a reduced noise reducing effect as compared with the example of FIG. 2A, but at least have a noise reducing effect as compared with the case where the sipe 7 is formed.

上記構成は、トレッド陸部５０内において両端が閉塞されている閉塞溝にも適用可能である。 The above configuration can also be applied to a closed groove in which both ends are closed in the tread land portion 50.

本開示の構成と効果を具体的に示すために、下記実施例について下記評価を行った。 In order to concretely show the structure and effect of the present disclosure, the following evaluations were carried out for the following examples.

（１）ノイズ評価
テストタイヤ（タイヤサイズＬＴ２６５／６５Ｒ１７）を、空気圧１９３ｋＰａ、荷重８２３８Ｎ、使用リム１７＊８−ＪＪ、速度７０ｋｍ／ｈ，８０ｋｍ／ｈ，９０ｋｍ／ｈとして、単体台上試験（ＪＡＳＯ Ｃ６０６−８１）を行った。タイヤ中心より左側の距離１ｍの地点に高さ０．２５ｍに設置したマイクロフォンを用いて音圧レベルを測定し、３速度の平均音圧レベルを求めた。 (1) Noise evaluation A test tire (tire size LT265 / 65R17) was tested on a stand-alone unit (JASO) with an air pressure of 193 kPa, a load of 8238 N, a rim used of 17 * 8-JJ, and a speed of 70 km / h, 80 km / h, and 90 km / h. C606-81) was performed. The sound pressure level was measured using a microphone installed at a height of 0.25 m at a distance of 1 m to the left of the center of the tire, and the average sound pressure level of the three speeds was obtained.

実施例１
図１，図２Ａに示すように、幅６ｍｍ、深さＤが１１ｍｍの閉塞溝６を有する陸部５０に、幅０．８ｍｍで深さｄが８ｍｍのコの字状のサイプ７を形成した。サイプ７と側壁６０の間の距離Ｗは２ｍｍである。閉塞溝６の側壁６０の長さ×２＋閉塞溝６の幅に対するサイプ７のコの字状長さは１１８％である。 Example 1
As shown in FIGS. 1 and 2A, a U-shaped sipe 7 having a width of 0.8 mm and a depth of 8 mm was formed in a land portion 50 having a closed groove 6 having a width of 6 mm and a depth of 11 mm. .. The distance W between the sipe 7 and the side wall 60 is 2 mm. The U-shaped length of the sipe 7 with respect to the length of the side wall 60 of the closed groove 6 × 2 + the width of the closed groove 6 is 118%.

実施例２
図４Ｃに示すように、サイプ７を、一方の側壁６０及び閉塞端６１の半分程度を囲むＬ字状に配置した。閉塞溝６の側壁６０の長さ×２＋閉塞溝６の幅に対するサイプ７のコの字状長さは５８％である。それ以外は、実施例１と同じとした。 Example 2
As shown in FIG. 4C, the sipes 7 are arranged in an L shape surrounding about half of one side wall 60 and the closed end 61. The U-shaped length of the sipe 7 with respect to the length of the side wall 60 of the closed groove 6 × 2 + the width of the closed groove 6 is 58%. Other than that, it was the same as in Example 1.

比較例１
図５に示すように、サイプ７を形成していない。それ以外は実施例１と同じとした。 Comparative Example 1
As shown in FIG. 5, the sipe 7 is not formed. Other than that, it was the same as in Example 1.

Figure 0006754186
Figure 0006754186

以上のように、本実施形態の空気入りタイヤは、
トレッド陸部５０に、周方向ＰＤに交差する延在方向ＤＤ１に延び且つ少なくとも一端が閉塞された閉塞溝６が形成されており、
閉塞溝６の周方向両側壁６０のうち少なくとも一方の側壁６０の縁部に、サイプ７が連続的又は断続的に延在方向ＤＤ１に延びており、
サイプ７の深さｄは、閉塞溝６の深さＤの６０％以上の深さを有し、
サイプ７は、側壁６０からサイプ深さｄよりも短い範囲内に配置されている。 As described above, the pneumatic tire of this embodiment is
A closed groove 6 extending in the extending direction DD1 intersecting the circumferential direction PD and having at least one end closed is formed in the tread land portion 50.
A sipe 7 extends continuously or intermittently in the extending direction DD1 at the edge of at least one side wall 60 of the circumferential side wall 60 of the obstruction groove 6.
The depth d of the sipe 7 has a depth of 60% or more of the depth D of the closed groove 6.
The sipe 7 is arranged within a range shorter than the sipe depth d from the side wall 60.

このように、閉塞溝６の側壁６０の縁部に、閉塞溝６の深さＤの６０％以上の深さｄを有するサイプ７が連続的又は断続的に閉塞溝６の延在方向ＤＤ１に延びており、側壁６０からサイプ深さｄよりも短い範囲内にサイプ７が配置されているので、陸部５０を変形させる力が作用した場合に、まずサイプ７が潰れ、閉塞溝６の側壁６０に力が伝わりにくく又は伝わらず、閉塞溝６の側壁６０の瞬間的な変形が抑制されるので、閉塞溝６又は閉塞溝６に連通する主溝５１の空気圧縮が低減する。その結果、空気圧縮に起因するノイズを低減することが可能となる。 In this way, at the edge of the side wall 60 of the closed groove 6, a sipe 7 having a depth d of 60% or more of the depth D of the closed groove 6 is continuously or intermittently in the extending direction DD1 of the closed groove 6. Since the sipe 7 extends from the side wall 60 and is arranged within a range shorter than the sipe depth d, when a force that deforms the land portion 50 acts, the sipe 7 is first crushed and the side wall of the closed groove 6 is crushed. Since the force is not easily transmitted to or not transmitted to the 60 and the momentary deformation of the side wall 60 of the closed groove 6 is suppressed, the air compression of the main groove 51 communicating with the closed groove 6 or the closed groove 6 is reduced. As a result, it is possible to reduce noise caused by air compression.

本実施形態では、サイプ７の延在方向ＤＤ１の合計長さＬ２は、側壁６０の延在方向ＤＤ１の長さＬ１の７０％以上である。この構成によれば、サイプ７にカバーされる側壁６０が７０％以上になるので、閉塞溝６の側壁６０の瞬間的な変形を抑制又は防止でき、ノイズ低減効果を有効に発揮させることが可能となる。 In the present embodiment, the total length L2 of the extension direction DD1 of the sipe 7 is 70% or more of the length L1 of the extension direction DD1 of the side wall 60. According to this configuration, since the side wall 60 covered by the sipe 7 is 70% or more, the momentary deformation of the side wall 60 of the closed groove 6 can be suppressed or prevented, and the noise reduction effect can be effectively exhibited. It becomes.

本実施形態では、サイプ７と側壁６０との間の距離は、１．５ｍｍ以上且つ６．０ｍｍ以下である。サイプ７と側壁６０との間の陸部による不具合を抑制できる。不具合としては、サイプ７と側壁６０との間の陸部の変形による閉塞溝６の壁面変形と、サイプ７と側壁６０との間の陸部が摩耗しないことが挙げられる。 In the present embodiment, the distance between the sipe 7 and the side wall 60 is 1.5 mm or more and 6.0 mm or less. Problems caused by land between the sipe 7 and the side wall 60 can be suppressed. Problems include deformation of the wall surface of the closed groove 6 due to deformation of the land portion between the sipe 7 and the side wall 60, and that the land portion between the sipe 7 and the side wall 60 does not wear.

本実施形態では、サイプ７は、閉塞溝６の周方向両側壁６０の両方に沿って配置されている。この構成によれば、サイプ７によってカバーされる側壁６０が増大するので、片側だけがカバーされる場合に比べてノイズ低減効果を向上させることが可能となる。 In this embodiment, the sipes 7 are arranged along both the circumferential wall 60s of the obstruction groove 6. According to this configuration, since the side wall 60 covered by the sipe 7 is increased, it is possible to improve the noise reduction effect as compared with the case where only one side is covered.

本実施形態では、サイプ７は、閉塞溝６の閉塞端６１に沿って配置され、閉塞溝６をコの字状に包囲している。この構成によれば、閉塞端６１の変形も抑制又は防止できるので、ノイズ低減効果を向上させることが可能となる。 In the present embodiment, the sipe 7 is arranged along the closed end 61 of the closed groove 6 and surrounds the closed groove 6 in a U shape. According to this configuration, the deformation of the closed end 61 can also be suppressed or prevented, so that the noise reduction effect can be improved.

本実施形態では、閉塞溝６は、一端が閉塞され、他端が、タイヤ周方向ＰＤに延びる主溝５１に連通している。この構成によれば、主溝５１に圧縮空気が押し出されることにより招来される気柱共鳴音を効果的に低減させることが可能となる。 In the present embodiment, one end of the closed groove 6 is closed, and the other end communicates with the main groove 51 extending in the tire circumferential direction PD. According to this configuration, it is possible to effectively reduce the air column resonance sound caused by the compressed air being pushed out into the main groove 51.

本実施形態では、閉塞溝６は、両端がトレッド陸部５０内において閉塞されている。この構成によれば、トレッド陸部が路面から離れる際に圧縮空気が一気に開放されることにより招来されるノイズを効果的に低減させることが可能となる。 In the present embodiment, both ends of the closed groove 6 are closed in the tread land portion 50. According to this configuration, it is possible to effectively reduce the noise caused by the compressed air being released at once when the tread land portion is separated from the road surface.

本実施形態では、閉塞溝６の延在方向ＤＤ１の長さが閉塞溝６の幅よりも長いが、両者が同じ長さでもよい。 In the present embodiment, the length of the extension direction DD1 of the obstruction groove 6 is longer than the width of the obstruction groove 6, but both may be the same length.

なお、上記の各実施形態で採用している構造を他の任意の実施形態に採用することは可能である。 It is possible to adopt the structure adopted in each of the above embodiments in any other embodiment.

５０…トレッド陸部
６…閉塞溝
６０…側壁
６１…閉塞端
７…サイプ
ＰＤ…周方向
ＤＤ１…延在方向 50 ... Tread land part 6 ... Blocking groove 60 ... Side wall 61 ... Blocking end 7 ... Sipe PD ... Circumferential direction DD1 ... Extension direction

Claims (7)

トレッド陸部に、周方向に交差する延在方向に延び且つ少なくとも一端が閉塞された閉塞溝が形成されており、
前記閉塞溝の周方向両側壁のうち少なくとも一方の側壁の縁部に、サイプが連続的又は断続的に前記延在方向に延びており、
前記サイプの深さは、前記閉塞溝の深さの６０％以上の深さを有し、
前記サイプの各部位は、前記側壁から前記各部位までの距離が、前記各部位におけるサイプ深さよりも短い範囲内に配置されている、空気入りタイヤ。 An obstruction groove extending in the extending direction intersecting the circumferential direction and having at least one end closed is formed in the land part of the tread.
A sipe extends continuously or intermittently in the extending direction at the edge of at least one side wall of the peripheral wall of the closed groove.
The depth of the sipe has a depth of 60% or more of the depth of the closed groove.
Each part of the sipe is a pneumatic tire in which the distance from the side wall to each part is within a range shorter than the sipe depth at each part . 前記サイプの前記延在方向の合計長さは、前記側壁の前記延在方向の長さの７０％以上である、請求項１に記載の空気入りタイヤ。 The pneumatic tire according to claim 1, wherein the total length of the sipe in the extending direction is 70% or more of the length of the side wall in the extending direction. 前記サイプと前記側壁との間の距離は、１．５ｍｍ以上且つ６．０ｍｍ以下である、請求項１又は２に記載の空気入りタイヤ。 The pneumatic tire according to claim 1 or 2, wherein the distance between the sipe and the side wall is 1.5 mm or more and 6.0 mm or less. 前記サイプは、前記閉塞溝の周方向両側壁の両方に沿って配置されている、請求項１〜３のいずれかに記載の空気入りタイヤ。 The pneumatic tire according to any one of claims 1 to 3, wherein the sipes are arranged along both the circumferential wall surfaces of the closed groove. 前記サイプは、前記閉塞溝の閉塞端に沿って配置され、前記閉塞溝をコの字状に包囲している、請求項４に記載の空気入りタイヤ。 The pneumatic tire according to claim 4, wherein the sipe is arranged along the closed end of the closed groove and surrounds the closed groove in a U shape. 前記閉塞溝は、一端が閉塞され、他端が、タイヤ周方向に延びる主溝に連通している、請求項１〜５のいずれかに記載の空気入りタイヤ。 The pneumatic tire according to any one of claims 1 to 5, wherein the closed groove has one end closed and the other end communicating with a main groove extending in the tire circumferential direction. 前記閉塞溝は、両端が前記トレッド陸部内において閉塞されている、請求項１〜５のいずれかに記載の空気入りタイヤ。 The pneumatic tire according to any one of claims 1 to 5, wherein both ends of the closed groove are closed in the land portion of the tread.
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