JP2016030492A - Pneumatic tire - Google Patents

Pneumatic tire Download PDF

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JP2016030492A
JP2016030492A JP2014153213A JP2014153213A JP2016030492A JP 2016030492 A JP2016030492 A JP 2016030492A JP 2014153213 A JP2014153213 A JP 2014153213A JP 2014153213 A JP2014153213 A JP 2014153213A JP 2016030492 A JP2016030492 A JP 2016030492A
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rim
convex
protect bar
tire
convex portion
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正俊 栗山
Masatoshi Kuriyama
正俊 栗山
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Yokohama Rubber Co Ltd
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Yokohama Rubber Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide pneumatic tires that can improve workability when stacking the tires and stability of the stacked tires while maintaining a rim flange protective performance by a rim protect bar.SOLUTION: A rim protect bar 10 is constituted of: a base portion 11 raised from an outer wall face of a side wall portion 2; a plurality of protruding portions 12 that are formed at intervals on an apex face 11a of the base portion 11 in a tire circumferential direction; and a plurality of recessed portions 13 that are formed between adjacent protruding portions 12 in the apex face 11a of the base portion 11 and can receive the opposing protruding portion 12 of the rim protect bar 10 when stacking tires.SELECTED DRAWING: Figure 1

Description

本発明は、サイドウォール部にリムプロテクトバーが形成された空気入りタイヤに関し、更に詳しくは、リムプロテクトバーによるリムフランジ保護性能を維持しながら、タイヤを積み重ねる際の作業性と積み重ねられたタイヤの安定性を向上することを可能にした空気入りタイヤに関する。   The present invention relates to a pneumatic tire in which a rim protect bar is formed on a sidewall portion, and more specifically, while maintaining the rim flange protection performance by the rim protect bar, the workability when stacking tires and the tires stacked The present invention relates to a pneumatic tire that can improve stability.

空気入りタイヤにおいて、サイドウォール部の外壁面にタイヤ幅方向外側に突出すると共にリムフランジに沿って周方向に延在するリムプロテクトバーと呼ばれる環状の膨出部を形成した空気入りタイヤが提案されている。このリムプロテクトバーは、リムフランジが縁石等の障害物と衝突して変形することを防止するものである。   In the pneumatic tire, a pneumatic tire is proposed in which an annular bulging portion called a rim protect bar that protrudes outward in the tire width direction and extends in the circumferential direction along the rim flange is formed on the outer wall surface of the sidewall portion. ing. This rim protection bar prevents the rim flange from colliding with an obstacle such as a curb and deforming.

ところで、このようなリムプロテクトバーが形成されたタイヤを運搬する際や倉庫等に保管する場合には、複数のタイヤをタイヤ幅方向に積み重ねることが多いが、上述のようにサイドウォール部にリムプロテクトバーが設けられているため、積み重ねられたタイヤの間でリムプロテクトバーどうしが互いに干渉し合い不安定になり、荷崩れが生じ易くなるという問題があった。   By the way, when transporting a tire having such a rim protection bar or storing it in a warehouse or the like, a plurality of tires are often stacked in the tire width direction. Since the protect bar is provided, the rim protect bars interfere with each other between the stacked tires and become unstable, and there is a problem that load collapse is likely to occur.

このような問題に対して、例えば、特許文献1では、タイヤ幅方向の一方側のリムプロテクトバーにタイヤ周方向に環状に延びる凸部を設け、タイヤ幅方向の他方側のリムプロテクトバーにタイヤ周方向に環状に延びる凹部を設け、これら凸部と凹部とが互いに噛み合わされて積み重なるようにすることを提案している。しかしながら、このようなタイヤでは、凹部が設けられたリムプロテクトバーはサイドウォール部からの突出高さが低くなるため、リムプロテクトバーとしての機能が充分に得られなくなるという問題がある。また、各タイヤに凸部が設けられたリムプロテクトバー及び凹部が設けられたリムプロテクトバーの対が必要になるため、タイヤ幅方向の片側のみにリムプロテクトバーを有する仕様の空気入りタイヤには採用することができないという問題がある。更に、凸部が設けられたリムプロテクトバーどうし或いは凹部が設けられたリムプロテクトバーどうしが対向するように積み重ねても安定性は向上せず、積み重ねる方向が限定されるため、タイヤを積み重ねる際の作業性を高めることが難しいという問題がある。   In order to deal with such a problem, for example, in Patent Document 1, a rim protect bar on one side in the tire width direction is provided with a convex portion extending annularly in the tire circumferential direction, and a tire is formed on the rim protect bar on the other side in the tire width direction. It has been proposed to provide a recess extending annularly in the circumferential direction so that the protrusion and the recess are engaged with each other and stacked. However, in such a tire, there is a problem in that the rim protect bar provided with the recess has a low protrusion height from the side wall portion, so that the function as the rim protect bar cannot be sufficiently obtained. In addition, since a pair of a rim protect bar having a convex portion and a rim protect bar having a concave portion is required for each tire, a pneumatic tire having a specification having a rim protect bar only on one side in the tire width direction is required. There is a problem that it cannot be adopted. Furthermore, even if the rim protect bars provided with convex portions or the rim protect bars provided with concave portions are stacked so as to face each other, the stability is not improved, and the stacking direction is limited. There is a problem that it is difficult to improve workability.

特開2009−292428号公報JP 2009-292428 A

本発明の目的は、リムプロテクトバーによるリムフランジ保護性能を維持しながら、タイヤを積み重ねる際の作業性と積み重ねたタイヤの安定性を向上することを可能にした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 workability when stacking tires and stability of stacked tires while maintaining rim flange protection performance by a rim protect bar. .

上記目的を達成するための本発明の空気入りタイヤは、左右一対のサイドウォール部のうち少なくとも片側のサイドウォール部の外壁面に、タイヤ幅方向外側に突出する環状のリムプロテクトバーを形成した空気入りタイヤにおいて、前記リムプロテクトバーを、前記サイドウォール部の外壁面から***した基部と、該基部の頂面にタイヤ周方向に間隔をおいて形成された複数の凸部と、前記基部の頂面における隣り合う前記凸部の間に形成されタイヤを積み重ねる際に対向する前記リムプロテクトバーの前記凸部を受容可能な複数の凹部とから構成したことを特徴とする。   In order to achieve the above object, the pneumatic tire of the present invention is an air in which an annular rim protect bar that protrudes outward in the tire width direction is formed on the outer wall surface of at least one of the pair of left and right sidewall portions. In the contained tire, the rim protect bar includes a base portion protruding from the outer wall surface of the sidewall portion, a plurality of convex portions formed on the top surface of the base portion at intervals in the tire circumferential direction, and a top portion of the base portion. A plurality of concave portions that are formed between adjacent convex portions on a surface and that can receive the convex portions of the rim protect bar that face each other when stacking tires are characterized in that they are characterized in that

本発明では、リムプロテクトバーの基部の頂面に複数の凸部と複数の凹部とが形成されているので、タイヤを積み重ねる際には、対向するリムプロテクトバーどうしの凸部と凹部とが噛み合うことになり、積み重ねたタイヤの安定性を向上することができる。このとき、従来のタイヤ幅方向の一方側のリムプロテクトバーに環状の凹部を設ける場合と異なり、リムプロテクトバーには必ず間欠的に凸部が設けられるので、リムプロテクトバー全体の高さが充分に確保され、リムプロテクトバーとしての機能が低下することがない。また、1つのリムプロテクトバーに凹部と凸部とが含まれているので、タイヤ幅方向の片側のサイドウォール部のみにリムプロテクトバーを有する仕様のタイヤであっても、積み重ねるタイヤのリムプロテクトバーどうしを対向させることで凹部と凸部とが噛み合い、安定した平積みが可能になる。その一方で、タイヤ幅方向の両側のサイドウォール部にリムプロテクトバーを有する仕様のタイヤの場合は、各リムプロテクトバーに凸部及び凹部が設けられているので、タイヤ幅方向のどの向きでタイヤを積み重ねても凸部と凹部とを噛み合わせることができるので、積み重ねる方向が限定されず、タイヤを積み重ねる際の作業性を高めることができる。   In the present invention, since a plurality of convex portions and a plurality of concave portions are formed on the top surface of the base portion of the rim protect bar, when the tires are stacked, the convex portions and the concave portions of the opposing rim protect bars are engaged with each other. As a result, the stability of the stacked tires can be improved. At this time, unlike the conventional case where an annular recess is provided on one side of the rim protect bar in the tire width direction, the rim protect bar is always provided with an intermittent protrusion, so that the overall height of the rim protect bar is sufficient. The function as a rim protect bar is not deteriorated. In addition, since one rim protect bar includes a concave portion and a convex portion, a rim protect bar for a tire to be stacked even if the tire has a rim protect bar only on one side wall portion in the tire width direction. By facing each other, the concave portion and the convex portion mesh with each other, and stable flat stacking becomes possible. On the other hand, in the case of a tire having a rim protect bar on both sidewalls in the tire width direction, each rim protect bar is provided with a convex portion and a concave portion. Since the convex portions and the concave portions can be engaged with each other even if they are stacked, the stacking direction is not limited, and the workability when stacking tires can be improved.

本発明においては、隣り合う凸部の間に位置する凹部の投影面積が凸部の1個あたりの投影面積の3倍以上であることが好ましい。これにより、タイヤを積み重ねる際に受け皿となる凹部の面積が凸部の面積よりも充分に大きくなり、タイヤを積み重ねる際の作業性を高めることができる。尚、投影面積とは、凸部又は凹部をタイヤ側面から見たときの面積である。   In the present invention, it is preferable that the projected area of the concave portion located between adjacent convex portions is three times or more the projected area per one convex portion. Thereby, the area of the recessed part used as a saucer when stacking a tire becomes sufficiently larger than the area of a convex part, and workability | operativity when stacking a tire can be improved. The projected area is an area when the convex portion or the concave portion is viewed from the tire side surface.

本発明においては、基部の横断面形状が略台形である一方で、凸部の横断面形状が略台形又は略三角形であり、且つ、凹部の横断面形状が凸部の横断面形状に対応する略台形又は略三角形であることが好ましい。このようにリムプロテクトバーを構成する基部、凸部、及び、凹部の形状を設定することで、タイヤを積み重ねる際に、凸部と凹部とが噛み合い易くなり、タイヤを積み重ねる際の作業性や積み重ねたタイヤの安定性を高めるには有利になる。   In the present invention, the cross-sectional shape of the base portion is substantially trapezoidal, while the cross-sectional shape of the convex portion is substantially trapezoidal or substantially triangular, and the cross-sectional shape of the concave portion corresponds to the cross-sectional shape of the convex portion. It is preferably a substantially trapezoidal shape or a substantially triangular shape. By setting the shape of the base, convex part, and concave part that constitute the rim protect bar in this way, when stacking the tire, the convex part and the concave part are easily engaged, and workability and stacking when stacking the tire are increased. It is advantageous to increase the stability of the tire.

本発明においては、凸部の高さが凹部の深さと同等以下である一方で、凸部の高さと凹部の深さとが共にリムプロテクトバーの高さよりも小さいことが好ましい。このように凸部及び凹部の高さを設定することで、タイヤを積み重ねる際に、凸部と凹部とが噛み合い易くなり、タイヤを積み重ねる際の作業性や積み重ねたタイヤの安定性を高めるには有利になる。   In the present invention, it is preferable that the height of the convex portion is equal to or less than the depth of the concave portion, while the height of the convex portion and the depth of the concave portion are both smaller than the height of the rim protect bar. By setting the height of the convex part and the concave part in this way, when the tires are stacked, the convex part and the concave part are easily engaged with each other. Become advantageous.

本発明は、扁平率が55以下である空気入りタイヤに好適に採用することができる。即ち、扁平率の低い空気入りタイヤでは、サイドウォール部の高さが小さくなるため、タイヤを積み重ねる際のリムプロテクトバーの影響が大きくなり、上述の凸部及び凹部による効果が効果的に発揮される。   The present invention can be suitably used for a pneumatic tire having an aspect ratio of 55 or less. That is, in a pneumatic tire having a low flatness ratio, the height of the sidewall portion is reduced, so that the influence of the rim protection bar when stacking the tires is increased, and the above-described effects due to the protrusions and recesses are effectively exhibited. The

本発明の実施形態からなる空気入りタイヤの要部を抽出して示す斜視図であ る。FIG. 2 is a perspective view showing a main part of a pneumatic tire according to an embodiment of the present invention. 図1のリムプロテクトバーの要部を抽出して示す斜視図である。It is a perspective view which extracts and shows the principal part of the rim protect bar of FIG. 本発明の別の実施形態からなるリムプロテクトバーの要部を抽出して示す斜 視図である。FIG. 5 is a perspective view showing an extracted main part of a rim protect bar according to another embodiment of the present invention. 本発明の別の実施形態からなるリムプロテクトバーの要部を抽出して示す斜 視図である。FIG. 5 is a perspective view showing an extracted main part of a rim protect bar according to another embodiment of the present invention. 本発明の別の実施形態からなるリムプロテクトバーの要部を抽出して示す斜 視図である。FIG. 5 is a perspective view showing an extracted main part of a rim protect bar according to another embodiment of the present invention.

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。   Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings.

図1に例示する空気入りタイヤTにおいて、CLはタイヤセンターライン、1はトレッド部、2はサイドウォール部、3はビード部である。左右一対のビード部3間にはカーカス層4が装架されている。このカーカス層4は、タイヤ径方向に延びる複数本の補強コードを含み、各ビード部3に配置されたビードコア5の廻りにタイヤ内側から外側に折り返されている。また、ビードコア5の外周上にはビードフィラー6が配置され、このビードフィラー6がカーカス層4の本体部分と折り返し部分により包み込まれている。   In the pneumatic tire T illustrated in FIG. 1, CL is a tire center line, 1 is a tread portion, 2 is a sidewall portion, and 3 is a bead portion. A carcass layer 4 is mounted between the pair of left and right bead portions 3. The carcass layer 4 includes a plurality of reinforcing cords extending in the tire radial direction, and is folded from the tire inner side to the outer side around the bead core 5 disposed in each bead portion 3. A bead filler 6 is disposed on the outer periphery of the bead core 5, and the bead filler 6 is wrapped by the main body portion and the folded portion of the carcass layer 4.

一方、トレッド部1におけるカーカス層4の外周側には複数層(図1では2層)のベルト層7,8が埋設されている。これらベルト層7,8はタイヤ周方向に対して傾斜する複数本の補強コードを含み、かつ層間で補強コードが互いに交差するように配置されている。ベルト層7,8において、補強コードのタイヤ周方向に対する傾斜角度は例えば10°〜40°の範囲に設定されている。更に、ベルト層7,8の外周側にはタイヤ周方向に配向する繊維コードを含むベルト補強層9が設けられている。ベルト補強層9のタイヤ周方向に対するコード角度は5°以下、より好ましくは、3°以下である。   On the other hand, a plurality of layers (two layers in FIG. 1) of belt layers 7 and 8 are embedded on the outer peripheral side of the carcass layer 4 in the tread portion 1. These belt layers 7 and 8 include a plurality of reinforcing cords inclined with respect to the tire circumferential direction, and are arranged so that the reinforcing cords cross each other between the layers. In the belt layers 7 and 8, the inclination angle of the reinforcing cord with respect to the tire circumferential direction is set in a range of 10 ° to 40 °, for example. Further, a belt reinforcing layer 9 including fiber cords oriented in the tire circumferential direction is provided on the outer peripheral side of the belt layers 7 and 8. The cord angle of the belt reinforcing layer 9 with respect to the tire circumferential direction is 5 ° or less, more preferably 3 ° or less.

本発明は、このような一般的な空気入りタイヤに適用されるが、その具体的な構造は上述の基本構造に限定されるものではない。   The present invention is applied to such a general pneumatic tire, but its specific structure is not limited to the basic structure described above.

本発明の空気入りタイヤの左右一対のサイドウォール部2のうち少なくとも片側のサイドウォール部2の外壁面には、図1に例示するように、タイヤ幅方向に突出すると共に、タイヤ周方向に環状に延在するリムプロテクトバー10が形成されている。このリムプロテクトバー10は、走行時にリムフランジ(不図示)が縁石等の障害物と衝突することを防ぐために設けられているので、少なくとも車両装着時に車両外側になるサイドウォール部2に設けられていれば良いが、タイヤ幅方向両側のサイドウォール部2に設けられていても良い。また、リムプロテクトバー10は、リムフランジを充分に保護することができるように、カーカスラインの幅が最大になる最大幅位置からの突出高さが例えば4mm〜10mmに設定されている。   As illustrated in FIG. 1, the outer wall surface of at least one side wall portion 2 of the pair of left and right side wall portions 2 of the pneumatic tire of the present invention protrudes in the tire width direction and is annular in the tire circumferential direction. A rim protect bar 10 is formed extending to the rim. Since the rim protect bar 10 is provided to prevent a rim flange (not shown) from colliding with an obstacle such as a curb stone during traveling, the rim protect bar 10 is provided at least on the side wall portion 2 that is outside the vehicle when the vehicle is mounted. However, it may be provided on the sidewall portions 2 on both sides in the tire width direction. In addition, the rim protect bar 10 has a protruding height from the maximum width position where the width of the carcass line is maximized, for example, 4 mm to 10 mm so that the rim flange can be sufficiently protected.

リムプロテクトバー10は、図1及び図2に示すように、基部11と複数の凸部12と複数の凹部13とから構成される。基部11は、サイドウォール部2の外壁面からタイヤ幅方向外側に***した部位で、タイヤ全周に亘って環状に形成される。図1の例では、断面形状が略台形であり頂面11aを有する。凸部12は、基部11の頂面11aに、タイヤ周方向に間隔をおいて形成される。これら基部11及び凸部12の全体がリムフランジを保護可能な高さを有し、リムプロテクトバー10として機能する(即ち、走行時にリムフランジ(不図示)が縁石等の障害物と衝突することを防止する)。図1の例では、凸部12も断面形状が略台形であり、基部11を構成する台形の脚に相当する面と凸部12を構成する台形の脚に相当する面とが滑らかに連結している。凹部12は、基部11の頂面11aにおける隣り合う凸部12の間に少なくとも1個(図1では3個)が形成される。凹部12は、凸部11を受容可能な形状(図1の例では、断面形状が凸部11を反転した略台形)に構成される。   As shown in FIGS. 1 and 2, the rim protect bar 10 includes a base portion 11, a plurality of convex portions 12, and a plurality of concave portions 13. The base 11 is a portion that protrudes from the outer wall surface of the sidewall portion 2 to the outside in the tire width direction, and is formed in an annular shape over the entire circumference of the tire. In the example of FIG. 1, the cross-sectional shape is a substantially trapezoid and has a top surface 11a. The convex portions 12 are formed on the top surface 11a of the base portion 11 at intervals in the tire circumferential direction. The whole of the base 11 and the protrusion 12 has a height capable of protecting the rim flange, and functions as the rim protect bar 10 (that is, the rim flange (not shown) collides with an obstacle such as a curb when traveling. Prevent). In the example of FIG. 1, the convex portion 12 also has a substantially trapezoidal cross section, and the surface corresponding to the trapezoidal leg constituting the base portion 11 and the surface corresponding to the trapezoidal leg constituting the convex portion 12 are smoothly connected. ing. At least one recess 12 is formed between adjacent protrusions 12 on the top surface 11a of the base 11 (three in FIG. 1). The concave portion 12 is configured in a shape that can receive the convex portion 11 (in the example of FIG. 1, the cross-sectional shape is a substantially trapezoid in which the convex portion 11 is inverted).

このようにリムプロテクトバー10を構成しているので、タイヤを積み重ねる際には、対向するリムプロテクトバー10どうしの凸部12と凹部13とが噛み合うことになり、平積み安定性を向上することができる。このとき、従来のタイヤ幅方向の一方側のリムプロテクトバー10に環状の凸部を設ける一方で他方側のリムプロテクトバー10に環状の凹部を設ける場合と異なり、片側のリムプロテクトバー10に凸部12及び凹部13の両方が含まれ、リムプロテクトバー10には必ず間欠的に凸部12が設けられるので、リムプロテクトバー10全体(基部11及び凸部12)の高さが充分に確保され、リムプロテクトバーとしてのリムフランジを保護する機能が低下することがない。また、1つのリムプロテクトバー10に凹部12と凸部13とが含まれているので、タイヤ幅方向の片側のサイドウォール部2のみにリムプロテクトバー10を有する仕様のタイヤであっても、積み重ねるタイヤのリムプロテクトバー10どうしを対向させることで凹部12と凸部13とが噛み合い、安定してタイヤを積み重ねることが可能になる(尚、この場合、リムプロテクトバー10を有さない側は、リムプロテクトバー10の干渉が生じないので、リムプロテクトバー10を有さないサイドウォール部2どうしを対向させることで安定して積み重ねることができる)。その一方で、タイヤ幅方向の両側のサイドウォール部2にリムプロテクトバー10を有する仕様のタイヤの場合は、両側のリムプロテクトバー10にそれぞれ凸部12及び凹部13が設けられているので、タイヤ幅方向のどの向きでタイヤを積み重ねても凸部12と凹部13とを噛み合わせることができるので、積み重ねる方向が限定されず、タイヤを積み重ねる際の作業性を高めることができる。   Since the rim protect bar 10 is configured in this way, when stacking tires, the convex portions 12 and the concave portions 13 of the rim protect bars 10 facing each other mesh with each other, thereby improving the flat stacking stability. Can do. At this time, unlike the conventional case where the annular ridge is provided on the rim protect bar 10 on the one side in the tire width direction and the annular recess is provided on the rim protect bar 10 on the other side, the convex is formed on the rim protect bar 10 on one side. Since both the portion 12 and the recess 13 are included and the rim protect bar 10 is always provided with the convex portion 12, the height of the entire rim protect bar 10 (the base portion 11 and the convex portion 12) is sufficiently secured. The function of protecting the rim flange as the rim protect bar does not deteriorate. Further, since one rim protect bar 10 includes the concave portion 12 and the convex portion 13, even a tire having a specification having the rim protect bar 10 only on the side wall portion 2 on one side in the tire width direction is stacked. By making the rim protect bars 10 of the tires face each other, the concave portions 12 and the convex portions 13 are engaged with each other, and the tire can be stacked stably (in this case, the side without the rim protect bars 10 is Since interference of the rim protect bar 10 does not occur, the side wall portions 2 that do not have the rim protect bar 10 can be stably stacked to face each other). On the other hand, in the case of a tire having a specification having the rim protect bar 10 on the sidewall portions 2 on both sides in the tire width direction, the rim protect bar 10 on both sides is provided with a convex portion 12 and a concave portion 13, respectively. Since the convex portion 12 and the concave portion 13 can be engaged with each other in any direction in the width direction, the stacking direction is not limited, and workability when stacking tires can be improved.

図1及び図2の例では、特に、凸部12の形状が略円錐台形に構成され、凹部13の形状が凸部12に対応する略円錐台形(凹部13を反転した略円錐台形の窪み)として構成される。このように、凸部12と凹部13とを積み重ねた際に互いに嵌合する形状に構成した場合、隣り合う凸部12の間には、複数個(図1の例では3個)の凹部13を配置することが好ましい。このように凹部13を配置することで、これら複数個の凹部13のいずれかに対向する凸部12が入り込めば安定して積み重ねることができるため、タイヤを積み重ねる際の作業性を向上することができる。   In the example of FIGS. 1 and 2, in particular, the shape of the convex portion 12 is configured to be substantially frustoconical, and the shape of the concave portion 13 is substantially frustoconical shape corresponding to the convex portion 12 (substantially frustoconical recess in which the concave portion 13 is inverted). Configured as Thus, when it comprises in the shape which mutually fits when the convex part 12 and the recessed part 13 are piled up, between the adjacent convex parts 12, a plurality (three in the example of FIG. 1) recessed part 13 is provided. Is preferably arranged. By arranging the recesses 13 in this way, if the projections 12 facing any one of the plurality of recesses 13 can enter, it can be stably stacked, so that the workability when stacking tires is improved. Can do.

このような凸部12及び凹部13(凸部12と、凸部12を反転した窪みとして構成される凹部13)を有する場合、これら凸部12及凹部13を1個ずつ交互に配置することもできるが、その場合、凸部12と凹部13とが一対一で対向しなければ凸部12と凹部13とを噛み合わせることができないため、タイヤを積み重ねる際に慎重に位置決めする必要が生じ、積み重ねる際の作業性が低下する。但し、作業性は低下するものの、全ての凸部12及び凹部13が一対一で完全に噛み合うため、積み重ねたタイヤの安定性は非常に優れる。   In the case of having such a convex portion 12 and a concave portion 13 (the convex portion 12 and a concave portion 13 configured as a depression obtained by inverting the convex portion 12), the convex portion 12 and the concave portion 13 may be alternately arranged one by one. However, in this case, since the convex portion 12 and the concave portion 13 cannot be engaged with each other unless the convex portion 12 and the concave portion 13 face each other, it is necessary to position the tire carefully when stacking the tires. Workability is reduced. However, although the workability is reduced, all the convex portions 12 and the concave portions 13 are completely meshed one-on-one, so that the stability of the stacked tires is very excellent.

図1及び図2のように、隣り合う凸部12の間に凸部12と対応する形状(凸部12を反転した窪み)の複数個の凹部13を配置する場合、隣り合う凸部12の間に存在する凹部13の個数は、好ましくは3個以上にするとよい。言い換えれば、隣り合う凸部12の間に位置する凹部13の投影面積が凸部13の1個あたりの投影面積の3倍以上であることが好ましい。このように凹部13を配置することで、タイヤを積み重ねる際に受け皿となる凹部13の個数が凸部の個数よりも充分に多くなり、タイヤを積み重ねる際の作業性を高めることができる。尚、リムプロテクトバー10としてのリムフランジ保護効果を充分に得るためには、隣り合う凸部12の間に存在する凹部13の個数を15個以下、即ち、隣り合う凸部12の間に位置する凹部13の投影面積を凸部13の1個あたりの投影面積の15倍以下にすることが好ましい。   As shown in FIGS. 1 and 2, when a plurality of concave portions 13 having a shape corresponding to the convex portion 12 (a depression obtained by inverting the convex portion 12) are arranged between the adjacent convex portions 12, The number of the recesses 13 existing between them is preferably 3 or more. In other words, it is preferable that the projected area of the concave portion 13 positioned between the adjacent convex portions 12 is three times or more the projected area per one convex portion 13. By arranging the recesses 13 in this manner, the number of recesses 13 that serve as a tray when stacking tires is sufficiently larger than the number of projections, and the workability when stacking tires can be improved. In order to sufficiently obtain the rim flange protecting effect as the rim protect bar 10, the number of the concave portions 13 existing between the adjacent convex portions 12 is 15 or less, that is, between the adjacent convex portions 12. It is preferable that the projected area of the recessed portion 13 to be made is 15 times or less of the projected area per projection 13.

凸部12の形状は、図1〜2のような略円錐台形の他、図3に示す略円錐、図4に示す略半球など、様々な形状にすることができる。同様に、凹部13も、凸部12の形状に対応させて、図3に示す略円錐、図4に示す略半球など、様々な形状にすることができる。但し、基部11についてはサイドウォール部2の外壁面と滑らかに連なるように横断面形状を略台形にすることが好ましいので、この断面略台形の基部11と凸部12とが滑らかに連なってリムプロテクトバー10全体としての形状が整うようにするために、凸部12の横断面形状を略台形又は略三角形にすることが好ましい。つまり、凸部12の立体形状としては、横断面形状が略台形又は略三角形となる例えば略円錐台形や略円錐が好ましい。これに対応して、凹部13の横断面形状は凸部12の横断面形状に対応する略台形又は略三角形が好ましく、立体形状としては横断面形状が略台形又は略三角形となる略円錐台形や略円錐が好ましい。   The shape of the convex portion 12 can be various shapes such as a substantially conical trapezoidal shape as shown in FIGS. 1 and 2, a substantially conical shape shown in FIG. 3, and a substantially hemispherical shape shown in FIG. Similarly, the recess 13 can also have various shapes such as a substantially cone shown in FIG. 3 and a substantially hemisphere shown in FIG. 4 corresponding to the shape of the protrusion 12. However, since it is preferable that the base 11 has a substantially trapezoidal cross-sectional shape so as to be smoothly connected to the outer wall surface of the sidewall portion 2, the base 11 and the convex portion 12 having a substantially trapezoidal cross section are smoothly connected to the rim. In order to make the shape of the protection bar 10 as a whole, it is preferable that the cross-sectional shape of the convex portion 12 is substantially trapezoidal or triangular. That is, as the three-dimensional shape of the convex portion 12, for example, a substantially truncated cone shape or a substantially cone shape whose cross-sectional shape is a substantially trapezoid or a substantially triangle is preferable. Correspondingly, the cross-sectional shape of the concave portion 13 is preferably a substantially trapezoidal shape or a substantially triangular shape corresponding to the cross-sectional shape of the convex portion 12, and the three-dimensional shape is a substantially frustoconical shape whose cross-sectional shape is a substantially trapezoidal shape or a substantially triangular shape. A substantially conical shape is preferred.

但し、凹部13の形状は凸部12を受容可能な形状であればよいので、必ずしも凸部12と一致する形状(即ち、凸部12を反転した窪み)である必要はない。例えば、図5に示すように、タイヤ側面から見たときに長円となる凹部13を設けることもできる。この場合も、凹部13が凸部12の受け皿となり、タイヤを積み重ねる際には凸部12と凹部13とが噛み合い、安定した積み重ねが可能となる。また、受け皿となる凹部13が凸部12に対して充分に大きい形状となるため、凸部12が凹部13内の任意の位置に対向すれば凸部12と凹部13とが噛み合うので、積み重ねる際の作業性が向上する。   However, since the shape of the concave portion 13 may be a shape that can receive the convex portion 12, the shape does not necessarily need to be a shape that coincides with the convex portion 12 (that is, a depression obtained by inverting the convex portion 12). For example, as shown in FIG. 5, it is possible to provide a recess 13 that is an ellipse when viewed from the side of the tire. Also in this case, the concave portion 13 serves as a tray for the convex portion 12, and when the tires are stacked, the convex portion 12 and the concave portion 13 are engaged with each other, and stable stacking is possible. Moreover, since the recessed part 13 used as a saucer becomes a shape large enough with respect to the convex part 12, if the convex part 12 opposes the arbitrary positions in the recessed part 13, the convex part 12 and the recessed part 13 will mesh, When stacking Improved workability.

この場合も、凹部13を凸部12よりも充分に大きくして積み重ね作業性を向上するために、隣り合う凸部12の間に位置する凹部13の投影面積を凸部13の1個あたりの投影面積の3倍以上にすることが好ましい。また、リムプロテクトバー10としてのリムフランジ保護効果を充分に得るために、凹部13の投影面積を凸部12の投影面積の15倍以下にすることが好ましい。   Also in this case, in order to make the concave portion 13 sufficiently larger than the convex portion 12 and improve the stacking workability, the projected area of the concave portion 13 positioned between the adjacent convex portions 12 is set to be equal to one per convex portion 13. It is preferable that the projected area is three times or more. Further, in order to sufficiently obtain the rim flange protecting effect as the rim protect bar 10, it is preferable that the projected area of the concave portion 13 is 15 times or less the projected area of the convex portion 12.

凸部12が凹部13に対して良好に噛み合うように、凸部12の高さH2を凹部13の深さH3以下にすることが好ましい。これにより、凸部12が凹部13内に嵌り込むので、凸部12と凹部13とを確実に噛み合わせることができ、タイヤを安定して積み重ねるには有利になる。このとき凸部12の高さH2が凹部13の深さH3よりも大きいと、凸部12の先端のみが凹部13に噛み合うことになるので、凹部13に対する凸部12の安定性が悪くなり、タイヤを安定して積み重ねることが難しくなる。また、凸部12の高さH2や凹部13の深さH3が大きくなり過ぎると、凹部13がサイドウォール部2から突出した部分(即ち、リムプロテクトバー10)を超えてサイドウォール部2の表面よりも内側まで達することになり、タイヤの耐久性が低下するため、凸部12の高さH2と凹部13の深さH3とは、共にリムプロテクトバー10の高さH(即ち、基部11の高さH1と凸部12の高さH2との和)よりも小さくすることが好ましい。   It is preferable that the height H <b> 2 of the convex portion 12 is set to be equal to or less than the depth H <b> 3 of the concave portion 13 so that the convex portion 12 meshes well with the concave portion 13. Thereby, since the convex part 12 fits in the recessed part 13, the convex part 12 and the recessed part 13 can be meshed | engaged reliably, and it becomes advantageous to pile up a tire stably. At this time, if the height H2 of the convex portion 12 is larger than the depth H3 of the concave portion 13, only the tip of the convex portion 12 meshes with the concave portion 13, so the stability of the convex portion 12 with respect to the concave portion 13 is deteriorated. It becomes difficult to stack tires stably. If the height H2 of the convex portion 12 and the depth H3 of the concave portion 13 become too large, the surface of the sidewall portion 2 exceeds the portion where the concave portion 13 protrudes from the sidewall portion 2 (that is, the rim protect bar 10). Therefore, the height H2 of the convex portion 12 and the depth H3 of the concave portion 13 are both the height H of the rim protect bar 10 (that is, the height of the base portion 11). The sum of the height H1 and the height H2 of the convex portion 12 is preferably smaller.

本発明は、サイドウォール部2の高さが小さく、タイヤを積み重ねる際のリムプロテクトバー10の影響が大きくなる扁平率の低い空気入りタイヤ、特に、扁平率が55以下である空気入りタイヤに好適に採用することができ、このようなタイヤにおいて、上述の凸部12及び凹部13による効果(積み重ねる際の作業性及び積み重ねたタイヤの安定性を向上する効果)が有効に発揮される。   The present invention is suitable for a pneumatic tire having a low flatness, particularly a pneumatic tire having a flatness ratio of 55 or less, in which the height of the sidewall portion 2 is small and the influence of the rim protection bar 10 when the tires are stacked increases. In such a tire, the effects (the effect of improving the workability in stacking and the stability of the stacked tires) of the above-described convex portions 12 and concave portions 13 are effectively exhibited.

タイヤ幅方向両側のサイドウォール部にリムプロテクトバー10を設ける場合、両側のリムプロテクトバー10における凸部12及び凹部13の配置パターンは同一にすることができる。この場合、車両に対する装着方向が指定されないタイヤにおいて有利である。即ち、タイヤ幅方向両側のリムプロテクトバー10が同じ形状を有するため、タイヤ幅方向のいずれの側を走行時に縁石等の障害物の影響を受けやすい車両外側に向けても優れたリムフランジ保護性能を得ることができる。勿論、タイヤ幅方向両側のリムプロテクトバー10における凸部12及び凹部13の配置パターンを互いに異ならせることも可能である。   When the rim protect bars 10 are provided on the sidewall portions on both sides in the tire width direction, the arrangement pattern of the convex portions 12 and the concave portions 13 in the rim protect bars 10 on both sides can be made the same. This is advantageous in a tire in which the mounting direction with respect to the vehicle is not specified. That is, since the rim protect bars 10 on both sides in the tire width direction have the same shape, the rim flange protection performance is excellent even if either side of the tire width direction is directed to the outside of the vehicle which is easily affected by obstacles such as curbs when traveling. Can be obtained. Of course, the arrangement patterns of the convex portions 12 and the concave portions 13 in the rim protect bar 10 on both sides in the tire width direction can be made different from each other.

タイヤサイズが215/45R17であり、リムプロテクトバーを除いたタイヤの断面構造を図1で共通にし、リムプロテクトバーの有無、リムプロテクトバーの構造(基部、凸部、凹部の有無)、凸部及び凹部の形状、隣り合う凸部間の凹部の個数、凸部の投影面積に対する凹部の投影面積の割合(凸部面積に対する凹部面積)、凸部の高さH2と凹部の深さH3との大小関係(凸部高さと凹部深さの関係)を表1のように異ならせた従来例1、比較例1〜2、実施例1〜6の9種類の試験タイヤを製造した。   The tire size is 215 / 45R17, and the cross-sectional structure of the tire excluding the rim protect bar is the same in FIG. 1, and the presence or absence of the rim protect bar, the structure of the rim protect bar (the presence or absence of the base, convex part, concave part), convex part And the shape of the concave portion, the number of concave portions between adjacent convex portions, the ratio of the projected area of the concave portion to the projected area of the convex portion (the concave portion area relative to the convex portion area), the height H2 of the convex portion and the depth H3 of the concave portion Nine types of test tires of Conventional Example 1, Comparative Examples 1-2, and Examples 1-6 with different magnitude relationships (relationship between the height of the convex portion and the depth of the concave portion) as shown in Table 1 were produced.

尚、リムプロテクトバーを有する全ての例(従来例1,比較例2,実施例1〜6)において、リムプロテクトバーはタイヤ幅方向両側のサイドウォール部に設けられる。また、実施例1〜6において、リムプロテクトバーの高さ(即ち、凸部が形成された部位の高さ)は9mm(基部の高さ:4mm、凸部の高さ5mm)に設定されている。   In all the examples having the rim protect bar (conventional example 1, comparative example 2 and examples 1 to 6), the rim protect bar is provided on the sidewall portions on both sides in the tire width direction. In Examples 1 to 6, the height of the rim protect bar (that is, the height of the portion where the convex portion is formed) is set to 9 mm (the height of the base portion: 4 mm, the height of the convex portion is 5 mm). Yes.

従来例1は、凸部や凹部を有さない基部のみからなるリムプロテクトバーが設けられたタイヤであり、リムプロテクトバーの高さ(即ち、基部の高さ)は実施例1〜6と同様に9mmに設定されている。比較例1は、リムプロテクトバーを有さないタイヤの例である。比較例2は、タイヤ幅方向の一方側のサイドウォール部に設けられたリムプロテクトバーに凸部のみ(環状の凸部)が設けられ、タイヤ幅方向の他方側のサイドウォール部に設けられたリムプロテクトバーには凹部のみ(環状の凹部)が設けられた例である(そのため、表1の「リムプロテクトバーの構造」の「凸部」及び「凹部」の欄には「一方側における有無/他方側における有無」のように記載している)。比較例2では、一方側(凸部が設けられた側)のリムプロテクトバーの高さが実施例1〜6と同様に9mm(基部の高さ:4mm、凸部の高さ5mm)に設定され、他方側(凹部が設けられた側)のリムプロテクトバーの高さ(基部の高さ)は4mmに設定されている。   Conventional Example 1 is a tire provided with a rim protect bar consisting only of a base portion having no protrusions or recesses, and the height of the rim protect bar (that is, the height of the base portion) is the same as in Examples 1-6. Is set to 9 mm. Comparative Example 1 is an example of a tire that does not have a rim protect bar. In Comparative Example 2, only the convex portion (annular convex portion) is provided on the rim protect bar provided on the sidewall portion on one side in the tire width direction, and provided on the sidewall portion on the other side in the tire width direction. This is an example in which the rim protect bar is provided with only a concave portion (annular concave portion) (for this reason, the “projection” and “recess” columns in the “Rim protect bar structure” in Table 1 are “existence on one side”. / Presence / absence on the other side). In Comparative Example 2, the height of the rim protect bar on one side (the side on which the convex portion is provided) is set to 9 mm (base height: 4 mm, convex portion height 5 mm) as in Examples 1-6. The height (base height) of the rim protect bar on the other side (the side where the recess is provided) is set to 4 mm.

これら9種類の試験タイヤについて、下記の評価方法によりタイヤを積み重ねる際の作業性、積み重ねられたタイヤの安定性、リムフランジ保護性能を評価し、その結果を表1に併せて示した。   For these nine types of test tires, the workability when stacking the tires, the stability of the stacked tires, and the rim flange protection performance were evaluated by the following evaluation methods, and the results are also shown in Table 1.

作業性
試験タイヤをリムサイズ17×7Jのホイールに組付け、空気圧230kPaを充填した条件で、台車上に4本の試験タイヤを積み上げる際の作業性を、従来例1を3(基準)とする5点法で評価した。この点数が大きいほど作業性が優れることを意味する。
Workability The workability when stacking four test tires on a truck under the condition that the test tire is assembled on a wheel with a rim size of 17 × 7 J and filled with an air pressure of 230 kPa is assumed to be 3 (standard) in Conventional Example 1. The point method was used for evaluation. A larger score means better workability.

安定性
試験タイヤをリムサイズ17×7Jのホイールに組付け、空気圧230kPaを充填した条件で、台車上に4本の試験タイヤを積み上げ、この台車で所定の通路を50m移動し、荷崩れを起こしたものを「1」、移動後に不安定なものを「3」、移動後も安定しているものを「5」とする5点法で評価し、この作業を5回繰り返し、その合計点で積み重ねられたタイヤの安定性を評価した。
Stability The test tires were assembled on a wheel with a rim size of 17 × 7J and filled with air pressure of 230 kPa. Four test tires were stacked on the carriage, and the truck moved 50 m along the predetermined path, causing collapse of the load. Evaluate by “5” method, “1” for things, “3” for things that are unstable after movement, and “5” for things that are stable after movement. The stability of the obtained tire was evaluated.

リムフランジ保護性能
予めリムフランジに厚さ2mm程度の塗料を塗っておき、速度5km/hrで縁石に対し5°の進入角度で前進し、ドライバーが衝撃を感じたところでブレーキをかけて停止する。そのときの塗料の損傷範囲にてリムフランジ保護性能を5点法で評価した。ほとんど損傷のないものを「5」とし、損傷範囲が大きいほど点数が小さくなる。尚、比較例2については、タイヤ幅方向の一方側と他方側とでリムフランジの形状が異なるため、タイヤの装着向きを変えて上記試験を行い、その平均でリムフランジ保護性能を評価した。
Rim flange protection performance Preliminarily paint the rim flange with a thickness of about 2mm, move forward at a speed of 5km / hr with an approach angle of 5 ° to the curb, and stop when the driver feels an impact by braking. The rim flange protection performance was evaluated by a five-point method within the damage range of the paint. “5” indicates that there is almost no damage, and the larger the damage range, the smaller the score. In Comparative Example 2, since the shape of the rim flange is different between the one side and the other side in the tire width direction, the above test was performed by changing the tire mounting direction, and the rim flange protection performance was evaluated on the average.

Figure 2016030492
Figure 2016030492

表1から判るように、実施例1〜6はいずれも、優れたリムフランジ保護性能を維持しながらタイヤを積み重ねる際の作業性と積み重ねられたタイヤの安定性を向上した。一方、リムプロテクトバーを有さない比較例1は、リムフランジどうしの干渉がないため作業性及び安定性は優れるがリムフランジ保護性能は得られない。また、実施例1〜6のように凸部と凹部とが噛み合わないため、実施例1〜6に比べて安定性も若干劣っていた。また、タイヤ幅方向の一方側のリムプロテクトバーに凸部のみが設けられ、タイヤ幅方向の他方側のリムプロテクトバーには凹部のみが設けられた比較例2は、積み重ねる方向が限定されるため作業性を向上することができず、また、凹部のみが形成されたリムプロテクトバーではリムフランジ保護性能が殆ど得られないため、タイヤ全体としてのリムフランジ保護性能も向上することができなかった。   As can be seen from Table 1, each of Examples 1 to 6 improved the workability when stacking tires and the stability of the stacked tires while maintaining excellent rim flange protection performance. On the other hand, Comparative Example 1 having no rim protection bar is excellent in workability and stability because there is no interference between the rim flanges, but the rim flange protection performance cannot be obtained. Moreover, since a convex part and a recessed part do not mesh | engage like Examples 1-6, compared with Examples 1-6, stability was also slightly inferior. Further, in Comparative Example 2 in which only the convex portion is provided on the rim protect bar on one side in the tire width direction and only the concave portion is provided on the rim protect bar on the other side in the tire width direction, the stacking direction is limited. The workability cannot be improved, and the rim flange protection performance of the tire as a whole cannot be improved because the rim protection bar having only the recesses hardly provides the rim flange protection performance.

1 トレッド部
2 サイドウォール部
3 ビード部
4 カーカス層
5 ビードコア
6 ビードフィラー
7,8 ベルト層
9 ベルト補強層
10 リムプロテクトバー
11 基部
11a 頂面
12 凸部
13 凹部
CL タイヤセンターライン
DESCRIPTION OF SYMBOLS 1 Tread part 2 Side wall part 3 Bead part 4 Carcass layer 5 Bead core 6 Bead filler 7, 8 Belt layer 9 Belt reinforcement layer 10 Rim protect bar 11 Base part 11a Top surface 12 Convex part 13 Concave part CL Tire center line

Claims (5)

左右一対のサイドウォール部のうち少なくとも片側のサイドウォール部の外壁面に、タイヤ幅方向外側に突出する環状のリムプロテクトバーを形成した空気入りタイヤにおいて、
前記リムプロテクトバーを、前記サイドウォール部の外壁面から***した基部と、該基部の頂面にタイヤ周方向に間隔をおいて形成された複数の凸部と、前記基部の頂面における隣り合う前記凸部の間に形成されタイヤを積み重ねる際に対向する前記リムプロテクトバーの前記凸部を受容可能な複数の凹部とから構成したことを特徴とする空気入りタイヤ。
In the pneumatic tire in which an annular rim protect bar that protrudes outward in the tire width direction is formed on the outer wall surface of at least one sidewall portion of the pair of left and right sidewall portions,
The rim protect bar includes a base portion protruding from the outer wall surface of the sidewall portion, a plurality of convex portions formed on the top surface of the base portion at intervals in the tire circumferential direction, and adjacent to the top surface of the base portion. A pneumatic tire characterized by comprising a plurality of recesses that are formed between the protrusions and that can receive the protrusions of the rim protection bar that face each other when the tires are stacked.
隣り合う前記凸部の間に位置する前記凹部の投影面積が前記凸部の1個あたりの投影面積の3倍以上であ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 pneumatic tire according to claim 1, wherein a projected area of the concave portion positioned between the adjacent convex portions is three times or more of a projected area per one convex portion. 前記基部の横断面形状が略台形である一方で、前記凸部の横断面形状が略台形又は略三角形であり、且つ、前記凹部の横断面形状が前記凸部の横断面形状に対応する略台形又は略三角形であることを特徴とする請求項1又は2に記載の空気入りタイヤ。   While the cross-sectional shape of the base is substantially trapezoidal, the cross-sectional shape of the convex portion is substantially trapezoidal or substantially triangular, and the cross-sectional shape of the concave portion corresponds to the cross-sectional shape of the convex portion. The pneumatic tire according to claim 1, wherein the pneumatic tire is trapezoidal or substantially triangular. 前記凸部の高さが前記凹部の深さと同等以下である一方で、前記凸部の高さと前記凹部の深さとが共に前記リムプロテクトバーの高さよりも小さいことを特徴とする請求項1〜3のいずれかに記載の空気入りタイヤ。   The height of the convex portion is equal to or less than the depth of the concave portion, and the height of the convex portion and the depth of the concave portion are both smaller than the height of the rim protect bar. 4. The pneumatic tire according to any one of 3. 扁平率が55以下であることを特徴とする請求項1〜4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 4, wherein the flatness is 55 or less.
JP2014153213A 2014-07-28 2014-07-28 Pneumatic tire Pending JP2016030492A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110382262A (en) * 2017-03-30 2019-10-25 株式会社普利司通 Tire

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110382262A (en) * 2017-03-30 2019-10-25 株式会社普利司通 Tire

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