JP5168804B2 - Pneumatic tire - Google Patents

Pneumatic tire Download PDF

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JP5168804B2
JP5168804B2 JP2006072759A JP2006072759A JP5168804B2 JP 5168804 B2 JP5168804 B2 JP 5168804B2 JP 2006072759 A JP2006072759 A JP 2006072759A JP 2006072759 A JP2006072759 A JP 2006072759A JP 5168804 B2 JP5168804 B2 JP 5168804B2
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tire
protruding
row
circumferential direction
length
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JP2007245945A (en
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俊郎 大山
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Yokohama Rubber Co Ltd
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Yokohama Rubber Co Ltd
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Priority to JP2006072759A priority Critical patent/JP5168804B2/en
Application filed by Yokohama Rubber Co Ltd filed Critical Yokohama Rubber Co Ltd
Priority to EP08008986A priority patent/EP1953009B1/en
Priority to DE200760002087 priority patent/DE602007002087D1/en
Priority to EP11151989.8A priority patent/EP2311654B1/en
Priority to EP20070005244 priority patent/EP1834812B1/en
Priority to EP11151991A priority patent/EP2311663B1/en
Priority to EP11151990A priority patent/EP2311662B1/en
Publication of JP2007245945A publication Critical patent/JP2007245945A/en
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Description

本発明は、空気入りタイヤに関し、更に詳しくは、水飛沫の飛散防止効果を確保しながら、もげやクラックの問題を改善するようにした空気入りタイヤに関する。   The present invention relates to a pneumatic tire, and more particularly to a pneumatic tire that improves the problem of baldness and cracks while ensuring the effect of preventing splashing of water splashes.

雨天時などに湿潤路面を走行した際に車両が水飛沫を飛散させ、それが後方を走行する車両の視界を悪化させ、走行安全性に悪影響が与える。特にトラックやバスなどの重荷重車両が湿潤路面を走行した際に水飛沫が大きく飛散し、後方を走行する車両に影響を与える。そこで、近年、サイドウォール部のトレッド部側外表面に水飛沫の飛散を防止する環状突起を設けた空気入りタイヤが提案されている（例えば、特許文献１参照）。   When the vehicle travels on a wet road surface in rainy weather or the like, the vehicle splashes water droplets, which deteriorates the visibility of the vehicle traveling behind and adversely affects traveling safety. In particular, when heavy-duty vehicles such as trucks and buses travel on wet roads, water splashes greatly, affecting vehicles traveling behind. Thus, in recent years, a pneumatic tire has been proposed in which an annular protrusion for preventing splashing of water droplets is provided on the outer surface of the sidewall portion on the tread portion side (see, for example, Patent Document 1).

しかしながら、特にトラックやバスなどの重荷重車両に使用される空気入りタイヤは、しばしば縁石などの段差部に乗り上げることがあり、その際、段差部に接触する環状突起の接触部に強い引張り応力が作用するため、接触部が破断してもげ（千切れ）易いという問題があった。また、通常のタイヤ転動時においても圧縮と引張りを繰り返し環状突起が受けるため、経時劣化によるサイドウォール部のゴムの劣化に伴い、環状突起とサイドウォール部表面の境界部にクラックが発生し易くなるという問題もある。
特開２０００−３１８４１０号公報 However, pneumatic tires used in heavy-duty vehicles such as trucks and buses often run on stepped portions such as curbs, and at that time, a strong tensile stress is applied to the contact portion of the annular protrusion that contacts the stepped portion. Because of the action, there is a problem that the contact portion is easily broken (severed). In addition, since the annular protrusion is repeatedly compressed and pulled even during normal tire rolling, cracks are likely to occur at the boundary between the annular protrusion and the surface of the sidewall part due to deterioration of the rubber of the sidewall part due to deterioration over time. There is also a problem of becoming.
JP 2000-318410 A

本発明は、水飛沫の飛散防止効果を確保しながら、もげやクラックの問題を改善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。   An object of the present invention is to provide a pneumatic tire capable of improving the problem of baldness and cracks while ensuring the effect of preventing splashing of water splashes.

上記目的を達成する本発明の空気入りタイヤは、湿潤路走行時に水飛沫が飛散するのを防止する突起部をサイドウォール部外表面のトレッド部側に設けた空気入りタイヤにおいて、前記突起部をタイヤ周方向に延在する複数の突起片から構成し、該複数の突起片を２列の千鳥状でタイヤ周方向に断続的に環状に配列し、かつタイヤ径方向から見た際に突起片により断部分を塞ぐように前記複数の突起片を千鳥状に配置すると共に、
前記２列の千鳥状に配列した突起片において、トレッド部側に近い１列目の突起片よりトレッド部側から離れる２列目の突起片の方をタイヤ軸方外側に突出させ、
タイヤを路面に接地させた接地時のタイヤ子午線断面において、トレッド面の接地端と前記１列目の突起片の突端とを通る仮想直線に対して、前記２列目の突起片はその突端が前記仮想直線上に位置するか或いは該仮想直線を超えてタイヤ軸方向外側に突出するようにしたことを特徴とする。 The pneumatic tire of the present invention that achieves the above object is a pneumatic tire provided with a protrusion on the tread portion side of the outer surface of the sidewall portion that prevents splashing of water droplets when traveling on a wet road. A plurality of projecting pieces extending in the tire circumferential direction, the plurality of projecting pieces being arranged in an annular manner in the tire circumferential direction in two rows in a staggered manner, and the projecting pieces when viewed from the tire radial direction And arranging the plurality of protruding pieces in a staggered manner so as to close the cut portion by,
In projecting piece arranged in staggered the two rows, projecting towards the second column of the projecting piece away from the tread portion side of the first column of the projecting piece close to the tread portion outward in the tire axial direction,
In the tire meridian cross section when the tire is in contact with the road surface, with respect to a virtual straight line passing through the grounding end of the tread surface and the protruding end of the first row of protruding pieces, the protruding piece of the second row has a protruding end. It is located on the virtual straight line or protrudes outward in the tire axial direction beyond the virtual straight line .

上述した本発明によれば、湿潤路走行時に水飛沫が飛散するのを防止する突起部を複数の突起片から構成するので、突起部（突起片）の剛性を従来の環状突起より低くすることができる。そのため、縁石などの段差部に突起片が接触しても突起片が撓んで接触部に作用する応力を緩和することができるので、突起片の接触部が破断し難くなり、耐もげ性を改善することが可能になる。   According to the present invention described above, the protrusion that prevents the splashing of water when traveling on a wet road is composed of a plurality of protrusions, so that the rigidity of the protrusion (protrusion) is lower than that of the conventional annular protrusion. Can do. Therefore, even if the protruding piece comes into contact with a stepped portion such as a curbstone, the protruding piece can bend and the stress acting on the contacting portion can be relieved, so that the contacting portion of the protruding piece becomes difficult to break, and the burr resistance is improved. It becomes possible to do.

また、通常のタイヤ転動時に圧縮と引張りが繰り返し突起片に作用しても、突起片が容易に撓むので、突起片とサイドウォール部外表面の境界部分にクラックを発生し難くすることができる。   In addition, even if compression and tension repeatedly act on the protruding piece during rolling of a normal tire, the protruding piece easily bends, so that it is difficult for cracks to occur at the boundary between the protruding piece and the sidewall surface. it can.

更に、複数の突起片を断部分を塞ぐようにしてタイヤ周方向に千鳥状で環状に配置するため、車両のタイヤがいずれの位置で水飛沫を飛散させてもその水飛沫を突起片に当てて飛散を防ぐことが可能になるので、水飛沫の飛散防止効果を確保することができる。   Furthermore, since a plurality of protruding pieces are arranged in a zigzag and annular manner in the tire circumferential direction so as to block off the cut portions, the water splashes are applied to the protruding pieces regardless of the position of the vehicle tire. Therefore, it is possible to prevent the splash of water from being scattered.

以下、本発明の実施の形態について添付の図面を参照しながら詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

図１は本発明の空気入りタイヤの一実施形態である、バスやトラックなどに用いられる重荷重用空気入りタイヤの要部を示し、１はトレッド部、２はサイドウォール部である。左右一対のビード部（不図示）間にカーカス層３が延設され、その両端部がビード部に埋設したビードコア（不図示）の周りにタイヤ内側から外側に折り返されている。トレッド部１のカーカス層３の外周側には、複数のベルト層４が設けられている。トレッド面１Ａにはタイヤ周方向に延在する複数の主溝５が形成されている。   FIG. 1 shows an essential part of a heavy-duty pneumatic tire used for buses, trucks and the like, which is an embodiment of the pneumatic tire of the present invention, where 1 is a tread portion and 2 is a sidewall portion. A carcass layer 3 extends between a pair of left and right bead portions (not shown), and both ends of the carcass layer 3 are folded back from the inside to the outside of a bead core (not shown) embedded in the bead portion. A plurality of belt layers 4 are provided on the outer peripheral side of the carcass layer 3 of the tread portion 1. A plurality of main grooves 5 extending in the tire circumferential direction are formed on the tread surface 1A.

タイヤ最大幅位置（ＪＡＴＭＡに規定される断面幅位置）Ｓよりトレッド部１側に位置するサイドウォール部２の外表面２ａには、湿潤路走行時に水飛沫が飛散するのを防止するための突起部６が設けられている。この突起部６は、図２に示すように、タイヤ周方向ＴＣに延在するゴムからなる複数の突起片７から構成されており、複数の突起片７を２列の千鳥状でタイヤ周方向ＴＣに断続的に環状に配列した構成になっている。タイヤ径方向ＴＲから見た際に、トレッド部１側に近い１列目の断続的に配列した突起片７Ａ間の断部分８を、トレッド部１側から離れた２列目の突起片７Ｂが塞ぐように複数の突起片７を千鳥状に配置している。   Protrusion for preventing splashing of water when traveling on wet roads on the outer surface 2a of the sidewall portion 2 located on the tread portion 1 side from the maximum tire width position (cross-sectional width position defined by JATMA) S Part 6 is provided. As shown in FIG. 2, the projection 6 is composed of a plurality of projection pieces 7 made of rubber extending in the tire circumferential direction TC, and the plurality of projection pieces 7 are arranged in two rows in a zigzag manner in the tire circumferential direction. It is configured to be arranged in an annular manner intermittently in TC. When viewed from the tire radial direction TR, the second row of projecting pieces 7B apart from the tread portion 1 side is connected to the discontinuity 8 between the first row of intermittently arranged projecting pieces 7A close to the tread portion 1 side. A plurality of projecting pieces 7 are arranged in a staggered manner so as to be closed.

２列目の突起片７Ｂは、１列目の突起片７Ａよりタイヤ軸方外側に突出し、突起片７Ａ間の断部分８を通過する水飛沫の飛散を遮断するようになっている。また、図３に示すように、２列目の突起片７Ｂのサイドウォール部外表面２ａにおけるタイヤ周方向長さＬ２（ｍｍ）が、１列目の突起片７Ａのサイドウォール部外表面２ａにおけるタイヤ周方向長さＬ１（ｍｍ）より短くなっている。２列目の突起片７Ｂは、１列目の突起片７Ａより突出させるため、１列目の突起片７Ａよりもゴムの使用量が多くなる。そこで、２列目の突起片７Ｂのタイヤ周方向長さＬ２を１列目の突起片７Ａのそれより短くすることで、２列目の突起片７Ｂに使用するゴムの量を抑制し、重量増加を抑えるようにしている。   The protrusions 7B in the second row protrude outward in the tire axial direction from the protrusions 7A in the first row, and block the splashing of water droplets passing through the cut portions 8 between the protrusions 7A. Further, as shown in FIG. 3, the tire circumferential direction length L2 (mm) on the sidewall portion outer surface 2a of the second row of projection pieces 7B is equal to that of the sidewall portion outer surface 2a of the first row of projection pieces 7A. It is shorter than the tire circumferential length L1 (mm). Since the second row of protruding pieces 7B protrude from the first row of protruding pieces 7A, the amount of rubber used is greater than that of the first row of protruding pieces 7A. Therefore, the amount of rubber used for the second row of projecting pieces 7B is reduced by reducing the tire circumferential length L2 of the second row of projecting pieces 7B to be shorter than that of the first row of projecting pieces 7A. I try to suppress the increase.

このように本発明では、湿潤路走行時に水飛沫が飛散するのを防止する突起部６を複数の突起片７から構成することにより、突起部６（突起片７）の剛性を従来の環状突起より低下させることができるので、縁石などの段差部に突起片７が接触しても突起片７が撓んで接触部に作用する引張り応力を緩和するため、接触部が破断し難くなり、耐もげ性を高めることができる。   As described above, according to the present invention, the protrusion 6 that prevents the splash of water from splashing when traveling on a wet road is composed of the plurality of protrusions 7, so that the rigidity of the protrusion 6 (protrusion piece 7) can be improved. Since the projection piece 7 is bent and the tensile stress acting on the contact portion is relieved even if the projection piece 7 comes into contact with a stepped portion such as a curbstone, the contact portion is less likely to break and the resistance to peeling. Can increase the sex.

また、通常のタイヤ転動時に圧縮と引張りが繰り返し突起片７に作用しても、突起片７が撓み易いため、突起片７とサイドウォール部外表面２ａの境界部にクラックが発生し難くなる。   Further, even when compression and tension repeatedly act on the protruding piece 7 during rolling of the tire, the protruding piece 7 is easily bent, so that a crack is hardly generated at the boundary between the protruding piece 7 and the sidewall outer surface 2a. .

しかも、複数の突起片７を断部分８を塞ぐようにしてタイヤ周方向ＴＣに千鳥状で環状に配置したことにより、車両のタイヤがいずれの位置で水飛沫を飛散させてもその水飛沫が突起片７に当たり飛散を防ぐことが可能になるため、水飛沫の飛散防止効果を確保することができる。   In addition, since the plurality of protruding pieces 7 are arranged in a zigzag and annular manner in the tire circumferential direction TC so as to block the cut portions 8, the water splashes can be generated even if the vehicle tire scatters the water splashes at any position. Since it becomes possible to prevent splashing by hitting the protruding pieces 7, it is possible to ensure the effect of preventing splashing of water splashes.

本発明において、突起片７のサイドウォール部外表面２ａにおけるタイヤ周方向長さＬ（ｍｍ）（図２，３参照）としては、タイヤを路面Ｒに接地させたタイヤ接地時におけるタイヤ最大接地長Ｗ（ｍｍ）に対して０．６Ｗ以下にするのがよい。突起片７のタイヤ周方向長さＬが０．６Ｗを超えると、突起片７の周長が長くなりすぎるため突起片７の剛性低減効果が減少し、接触部が破断し易くなる。突起片７のタイヤ周方向長さＬの下限値としは、製造の点から０．１Ｗ以上にするのがよい。   In the present invention, the tire circumferential direction length L (mm) (see FIGS. 2 and 3) on the sidewall portion outer surface 2a of the protrusion piece 7 is the maximum tire contact length at the time of tire contact when the tire is grounded on the road surface R. It is preferable to set it to 0.6 W or less with respect to W (mm). If the circumferential length L of the protruding piece 7 exceeds 0.6 W, the circumferential length of the protruding piece 7 becomes too long, so that the effect of reducing the rigidity of the protruding piece 7 is reduced and the contact portion is easily broken. The lower limit of the circumferential length L of the protrusion piece 7 is preferably 0.1 W or more from the viewpoint of manufacturing.

突起片７は、図４に示すように、突起片７の突出端にいくに従い、タイヤ周方向長さが短くなるようにするのが、耐もげ性を高める上でよい。突起片７の突出端でのタイヤ周方向長さＬ’（ｍｍ）と突起片７のサイドウォール部外表面２ａにおけるタイヤ周方向長さＬとの比Ｌ’／Ｌとしては、０．８以下にするのが突起片７の耐もげ性を効果的に高める上でよい。比Ｌ’／Ｌの下限値としては、重量増大及び飛散防止効果維持の点から０．５以上にするのがよい。   As shown in FIG. 4, the protrusion piece 7 has a tire circumferential length that decreases as it goes to the protruding end of the protrusion piece 7 in order to improve the scuff resistance. The ratio L ′ / L between the tire circumferential direction length L ′ (mm) at the protruding end of the protruding piece 7 and the tire circumferential direction length L on the sidewall portion outer surface 2a of the protruding piece 7 is 0.8 or less. In order to effectively improve the bald resistance of the protruding piece 7, it is sufficient. The lower limit value of the ratio L ′ / L is preferably 0.5 or more from the viewpoint of weight increase and the effect of preventing scattering.

また、図５に示すように、タイヤを路面Ｒに接地させたタイヤ接地時のタイヤ子午線断面において、トレッド面１Ａの接地端Ａと１列目の突起片７Ａの突端ｂとを通る仮想直線をＭとすると、２列目の突起片７Ｂは、その突端ｃがこの直線Ｍ上に位置するか或いはこの仮想直線Ｍを超えてタイヤ軸方向外側に突出するようにするのが、２列目の突起片７Ｂによる飛散防止効果を高める上でよい。路面Ｒに対する仮想直線Ｍの角度θとしては４５°以上にするのがよい。なお、突起片７Ａ，７Ｂの突端ｂ，ｃとは、図６に示すように突端が尖っていない場合には、仮想直線Ｍを突端部表面に接するように引いた時の接点の位置である。   Further, as shown in FIG. 5, in the tire meridian cross section when the tire is in contact with the road surface R, a virtual straight line passing through the contact end A of the tread surface 1A and the protrusion b of the first row of projecting pieces 7A is obtained. Assuming M, the protrusions 7B in the second row have their protrusions c positioned on the straight line M or projecting outward in the tire axial direction beyond the virtual straight line M. It is good for improving the scattering prevention effect by the protruding piece 7B. The angle θ of the virtual straight line M with respect to the road surface R is preferably 45 ° or more. Note that the protruding ends b and c of the protruding pieces 7A and 7B are the positions of the contacts when the virtual straight line M is drawn so as to contact the protruding end surface when the protruding end is not sharp as shown in FIG. .

また、仮想直線Ｍが延在する方向から見た時、突起片７Ａ，７Ｂのオーバーラップ長さＤ（ｍｍ）（オーバーラップする部分で最短となる部分のタイヤ周方向長さ）を０以上にし、かつタイヤ軸と直交する方向の突端ｂ，ｃ間の距離をＨ（ｍｍ）とすると、比Ｈ／Ｄを０＜Ｈ／Ｄ≦３となるようにするのが高い飛散防止効果を確保する上で好ましい。   Further, when viewed from the direction in which the virtual straight line M extends, the overlap length D (mm) of the projecting pieces 7A and 7B (the tire circumferential direction length of the shortest portion of the overlapping portions) is set to 0 or more. In addition, when the distance between the protrusions b and c in the direction orthogonal to the tire axis is H (mm), it is ensured that the ratio H / D satisfies 0 <H / D ≦ 3. Preferred above.

上記突起片７は、図１に示すように、ベルト層４のエッジ４ｅに対面するトレッド部外表面２ａの領域に設けるのが、飛散防止効果を確保しながら突起片７の突出量を低く抑えて使用するゴム量を少なくすることができるので好ましい。更に好ましくは、突起片７の突端部がタイヤ接地時に主溝５の溝底５ａよりタイヤ径方向内側となるようにするのがよく、それにより主溝５が摩耗寿命に達するまで突起片７による飛散防止効果を得ることができる。   As shown in FIG. 1, the protrusion piece 7 is provided in the region of the outer surface 2a of the tread portion facing the edge 4e of the belt layer 4, and the protrusion amount of the protrusion piece 7 is kept low while ensuring the scattering prevention effect. This is preferable because the amount of rubber used can be reduced. More preferably, the projecting end portion of the projecting piece 7 should be located on the inner side in the tire radial direction from the groove bottom 5a of the main groove 5 when the tire contacts the ground, so that the projecting piece 7 is used until the main groove 5 reaches the wear life. A scattering prevention effect can be obtained.

突起片７は、上述した実施形態に示すように、２列の千鳥状に配置するのが好ましいが、３列以上の千鳥状に配置することも可能であり、少なくとも２列の千鳥状でタイヤ周方向ＴＣに断続的に環状に配列すればよい。 Projecting pieces 7, as shown in the embodiment described above, it is preferable to place the two rows staggered, it is also possible to arrange three or more rows of staggered, least be two rows staggered Thus, it may be arranged in an annular manner intermittently in the tire circumferential direction TC.

また、突起片７は、タイヤ装着時に車両外側に位置する一方のサイドウォール部に設ければ十分であるが、両サイドウォール部に設けるようにしてもよい。   Further, it is sufficient that the protruding piece 7 is provided on one side wall portion located outside the vehicle when the tire is mounted, but it may be provided on both side wall portions.

本発明は、特にトラックやバスなどに使用される重荷重用の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、乗用車用の空気入りタイヤなどであってもよい。   The present invention can be preferably used for a heavy-duty pneumatic tire particularly used for trucks and buses, but is not limited thereto, and may be a pneumatic tire for passenger cars.

なお、本発明で言うタイヤ接地時とは、ＪＡＴＭＡ（ＪＡＴＭＡ ＹＥＡＲ ＢＯＯＫ ２００５）に記載される最大負荷能力に対応する空気圧、及び最大負荷能力と同じ荷重を加えてタイヤを接地させた時である。   The term “tire contact” as used in the present invention refers to the time when the tire is grounded by applying the same air pressure as the maximum load capability described in JATMA (JATMA YEAR BOOK 2005) and the same load as the maximum load capability.

タイヤサイズを２７５／８０Ｒ２２．５で共通にし、サイドウォール部外表面に突起片を２列の千鳥状に配列し、該突起片の各構成要件を表１のようにした図１，２に示す構造の実施例１〜５（本発明タイヤ）と参考例（参考タイヤ）、突起片に代えて環状突起を配置した従来例（従来タイヤ）、及び従来タイヤにおいて環状突起を断続する構造にした比較例（比較タイヤ）をそれぞれ試験タイヤとして作製した。 1 and 2 in which tire sizes are common to 275 / 80R22.5, projecting pieces are arranged in a zigzag pattern in two rows on the outer surface of the side wall, and each constituent element of the projecting pieces is as shown in Table 1. Examples 1 to 5 of the structure (tire of the present invention) and reference example (reference tire) , a conventional example (conventional tire) in which an annular protrusion is arranged instead of the protrusion piece, and a comparison in which the annular protrusion is interrupted in the conventional tire Each example (comparative tire) was prepared as a test tire.

これら各試験タイヤをリムサイズ２２．５×７．５０のリムに装着し、空気圧を９００ｋＰａにして、総重量２５トンのトラックに取り付け、以下に示す方法により水飛沫の飛散防止効果と耐もげ性の評価試験を行ったところ、表１に示す結果を得た。   Each of these test tires is mounted on a rim having a rim size of 22.5 × 7.50, the air pressure is set to 900 kPa, and it is mounted on a truck having a total weight of 25 tons. When the evaluation test was conducted, the results shown in Table 1 were obtained.

水飛沫の飛散防止効果（水飛散防止効果）
湿潤路テスト路面を直進走行した時の水飛沫の飛散状態を１０人の試験官により目視で観察し、その結果を従来タイヤを１００とする指数値で示した。この値が大きい程、水飛沫の飛散防止効果が高い。 Water splash prevention effect (Water splash prevention effect)
The splash state of water droplets when traveling straight on the wet road test road surface was visually observed by 10 examiners, and the result was shown as an index value with the conventional tire as 100. The larger this value, the higher the effect of preventing splashing of water splashes.

耐もげ性
高さ２００ｍｍの縁石乗り上げ試験を２０回繰り返し行い、突起片または環状突起においてゴムがもげた個所の発生数をカウントし、その結果を従来タイヤを１００とする指数値で示した。この値が大きい程、耐もげ性が優れている。 Curing resistance A curb climbing test with a height of 200 mm was repeated 20 times, the number of occurrences of rubber flaking on the projection piece or the annular projection was counted, and the result was shown as an index value where the conventional tire was 100. The larger this value, the better the baldness resistance.

Figure 0005168804
Figure 0005168804

表１から、本発明タイヤは、耐もげ性を改善することができる一方、水飛沫の飛散防止効果も９０以上あり、水飛沫の飛散防止効果を確保できることがわかる。   From Table 1, it can be seen that the tire of the present invention can improve the baldness resistance, but also has an effect of preventing splashing of water splashes of 90 or more, and can ensure the effect of preventing splashing of water splashes.

本発明の空気入りタイヤの一実施形態を示す部分断面図である。It is a fragmentary sectional view showing one embodiment of the pneumatic tire of the present invention. タイヤ接地時の部分側面図である。It is a partial side view at the time of tire contact. １列目と２列目の突起片を突端側から見た説明図である。It is explanatory drawing which looked at the projection piece of the 1st row and the 2nd row from the protrusion side. 図３のＸ−Ｘ矢視図である。It is a XX arrow line view of FIG. タイヤ接地時の要部断面説明図である。It is principal part cross-sectional explanatory drawing at the time of tire contact. 他の突起片において、仮想直線Ｍを引く例を示す断面説明図である。It is sectional explanatory drawing which shows the example which draws the virtual straight line M in another protrusion piece.

符号の説明Explanation of symbols

１ トレッド部
２ サイドウォール部
２ａ 外表面
６ 突起部
７，７Ａ，７Ｂ 突起片
８ 断部分
ＴＣ タイヤ周方向 DESCRIPTION OF SYMBOLS 1 Tread part 2 Side wall part 2a Outer surface 6 Protrusion part 7,7A, 7B Protrusion piece 8 Cut part TC Tire circumferential direction

Claims (6)

湿潤路走行時に水飛沫が飛散するのを防止する突起部をサイドウォール部外表面のトレッド部側に設けた空気入りタイヤにおいて、前記突起部をタイヤ周方向に延在する複数の突起片から構成し、該複数の突起片を２列の千鳥状でタイヤ周方向に断続的に環状に配列し、かつタイヤ径方向から見た際に突起片により断部分を塞ぐように前記複数の突起片を千鳥状に配置すると共に、
前記２列の千鳥状に配列した突起片において、トレッド部側に近い１列目の突起片よりトレッド部側から離れる２列目の突起片の方をタイヤ軸方外側に突出させ、
タイヤを路面に接地させた接地時のタイヤ子午線断面において、トレッド面の接地端と前記１列目の突起片の突端とを通る仮想直線に対して、前記２列目の突起片はその突端が前記仮想直線上に位置するか或いは該仮想直線を超えてタイヤ軸方向外側に突出するようにした空気入りタイヤ。 In a pneumatic tire provided with a protruding portion on the tread portion side of the outer surface of the sidewall portion that prevents splashing of water when traveling on a wet road, the protruding portion is composed of a plurality of protruding pieces extending in the tire circumferential direction. The plurality of protrusions are arranged in a staggered manner in two rows in an annular manner in the tire circumferential direction, and the plurality of protrusions are closed by the protrusions when viewed from the tire radial direction. In a staggered arrangement,
In projecting piece arranged in staggered the two rows, projecting towards the second column of the projecting piece away from the tread portion side of the first column of the projecting piece close to the tread portion outward in the tire axial direction,
In the tire meridian cross section when the tire is in contact with the road surface, with respect to a virtual straight line passing through the grounding end of the tread surface and the protruding end of the first row of protruding pieces, the protruding piece of the second row has a protruding end. A pneumatic tire located on the virtual straight line or protruding outward in the tire axial direction beyond the virtual straight line . 前記突起片のサイドウォール部外表面におけるタイヤ周方向長さＬをタイヤ最大接地長Ｗに対して０．６Ｗ以下にした請求項１に記載の空気入りタイヤ。   2. The pneumatic tire according to claim 1, wherein a length L in a tire circumferential direction on an outer surface of the sidewall portion of the protruding piece is 0.6 W or less with respect to a tire maximum ground contact length W. 3. 前記突起片は、突出端にいくに従いタイヤ周方向長さが短くなる請求項１または２に記載の空気入りタイヤ。   The pneumatic tire according to claim 1, wherein the protruding piece has a tire circumferential direction length that decreases toward a protruding end. 前記突起片の突出端でのタイヤ周方向長さＬ' と前記突起片のサイドウォール部外表面におけるタイヤ周方向長さＬとの比Ｌ' ／Ｌを０．８以下にした請求項３に記載の空気入りタイヤ。   The ratio L ′ / L of the tire circumferential direction length L ′ at the projecting end of the projecting piece and the tire circumferential direction length L on the outer surface of the sidewall portion of the projecting piece is set to 0.8 or less. The described pneumatic tire. 前記２列の千鳥状に配列した突起片において、トレッド部側に近い前記１列目の突起片のサイドウォール部外表面におけるタイヤ周方向長さＬ１よりトレッド部側から離れる前記２列目の突起片のサイドウォール部外表面におけるタイヤ周方向長さＬ２を短くした請求項１乃至４のいずれか１項に記載の空気入りタイヤ。 In the two rows of staggered protrusions, the second row of protrusions separated from the tread portion side by the tire circumferential direction length L1 on the sidewall outer surface of the first row of protrusion pieces close to the tread portion side. The pneumatic tire according to any one of claims 1 to 4, wherein a length L2 in a tire circumferential direction on an outer surface of one side wall portion is shortened. 前記仮想直線が延在する方向から見たとき、前記１列目の突起片と前記２列目の突起片とがオーバーラップする部分で最短となる部分のタイヤ周方向長さＤ（ｍｍ）を０以上にし、タイヤ軸と直交する方向に測定される前記１列目の突起片の突端と前記２列目の突起片の突端との間の距離Ｈ（ｍｍ）の前記長さＤに対する比Ｈ／Ｄを０＜Ｈ／Ｄ≦３となるようにした請求項１乃至５のいずれか１項に記載の空気入りタイヤ。When viewed from the direction in which the imaginary straight line extends, the tire circumferential direction length D (mm) of the shortest portion in the portion where the first row of protruding pieces and the second row of protruding pieces overlap. The ratio H of the distance H (mm) between the protruding end of the first row of protruding pieces and the protruding end of the second row of protruding pieces measured in a direction perpendicular to the tire axis to the length D is set to 0 or more. The pneumatic tire according to any one of claims 1 to 5, wherein / D satisfies 0 <H / D≤3.
JP2006072759A 2006-03-16 2006-03-16 Pneumatic tire Expired - Fee Related JP5168804B2 (en)

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EP20070005244 EP1834812B1 (en) 2006-03-16 2007-03-14 Pneumatic tire
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